WO2014092376A1 - Galvanized steel sheet for hot stamping and having excellent impact characteristics, and method for manufacturing steel product having different strengths using same - Google Patents

Galvanized steel sheet for hot stamping and having excellent impact characteristics, and method for manufacturing steel product having different strengths using same Download PDF

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Publication number
WO2014092376A1
WO2014092376A1 PCT/KR2013/011192 KR2013011192W WO2014092376A1 WO 2014092376 A1 WO2014092376 A1 WO 2014092376A1 KR 2013011192 W KR2013011192 W KR 2013011192W WO 2014092376 A1 WO2014092376 A1 WO 2014092376A1
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steel sheet
blank
galvanized steel
weight
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PCT/KR2013/011192
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French (fr)
Korean (ko)
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이영수
남승만
권민석
이승하
임희중
이보룡
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현대하이스코 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
    • B23K20/227—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded with ferrous layer
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the present invention relates to a steel product manufacturing technology using hot stamping, and more particularly to a hot-dip galvanized steel sheet for improved impact performance and a steel product manufacturing method having a heterogeneous strength using the same.
  • each part of the vehicle is a structural characteristic, some parts are required to have a high strength, and another part may require a high impact toughness. That is, there are components that require locally heterogeneous strength (or physical properties).
  • An example may be an automobile B-pillar 100 schematically illustrated in FIG. 1.
  • a first portion of the upper portion and a second portion of the lower portion are included.
  • the first portion 110 of the upper portion serves to support the impact during the collision
  • the second portion 120 of the lower portion serves to absorb the impact during the collision.
  • the physical properties of the first portion or the second portion may be changed by heat generated by welding after hot stamping.
  • Background art related to the present invention is a method for producing a steel product having a heterogeneous strength using a laser heat treatment disclosed in Republic of Korea Patent Publication No. 10-1119173 (announced on February 22, 2012) and heat-treated hardened steel used therein.
  • One object of the present invention is to provide a hot stamping galvanized steel sheet that can produce a steel product with excellent impact absorption ability in the event of a collision.
  • Another object of the present invention is to provide a method for producing a steel product having a heterogeneous strength by hot stamping method using the galvanized steel sheet for hot stamping and the galvanized steel sheet having excellent hardenability.
  • Heat-treated hardened galvanized steel sheet for achieving the above one object by weight, carbon (C): 0.05 ⁇ 0.17%, silicon (Si): 0.01 ⁇ 0.55%, manganese (Mn): 1.0 ⁇ 2.3%, Phosphorus (P): 0.04% or less, Sulfur (S): 0.015% or less, Chromium (Cr): 0.01 ⁇ 0.38%, Molybdenum (Mo): 0.001 ⁇ 0.25%, Titanium (Ti): 0.03 ⁇ 0.1%, niobium (Nb): 0.004 ⁇ 0.1%, consisting of the remaining iron (Fe) and inevitable impurities, a plated layer containing zinc is formed on the surface, tensile strength 700 ⁇ 1200MPa and elongation after hot stamping It is characterized by showing 12.0% or more.
  • the galvanized steel sheet by weight, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and boron (B): 0.001% or less It may further include.
  • the galvanized steel sheet may be a hot dip galvanized steel sheet or an alloyed hot dip galvanized steel sheet.
  • Steel product manufacturing method for achieving the above another object is (a) wt%, carbon (C): 0.05 ⁇ 0.17%, silicon (Si): 0.01 ⁇ 0.55%, manganese (Mn) : 1.0 ⁇ 2.3%, Phosphorus (P): 0.04% or less, Sulfur (S): 0.015% or less, Chromium (Cr): 0.01 ⁇ 0.38%, Molybdenum (Mo): 0.001 ⁇ 0.25%, Titanium (Ti): 0.03 ⁇ 0.1%, niobium (Nb): 0.004 to 0.1%, the first blank is made of the remaining iron (Fe) and inevitable impurities, the plated layer containing zinc is formed on the surface, and the tensile strength after hot stamping Welding a second blank exhibiting 1300 to 1600 MPa and an elongation of 6.0 to 10.0%; (b) heating the welded first blank and second blank; And (c) hot stamp
  • the first blank is a weight%, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and boron (B): 0.001% or less It may further include.
  • the first blank may be manufactured from a hot dip galvanized steel sheet or an alloyed hot dip galvanized steel sheet.
  • the second blank is a weight%, carbon (C): 0.12 ⁇ 0.42%, silicon (Si): 0.03 ⁇ 0.6%, manganese (Mn): 0.8 ⁇ 4.0%, phosphorus (P): 0.2% or less, Sulfur (S): 0.1% or less, chromium (Cr): 0.01-1.0% and boron (B): 0.0005-0.03%, with the sum of one or more of aluminum (Al) and titanium (Ti): 0.05-0.3%, One or more of nickel (Ni) and vanadium (V): 0.03% to 4.0%, consisting of the remaining iron (Fe) and unavoidable impurities, a plating layer containing zinc on the surface may be formed.
  • the first blank and the second blank may be heated to 850 ⁇ 905 °C.
  • the hot stamping galvanized steel sheet according to the present invention can exhibit a tensile strength of 700 ⁇ 1200MPa and elongation of 12.0% or more after hot stamping, to use as a part to play a role of shock absorption during collision in steel products having different strengths Suitable.
  • FIG. 1 schematically shows an automobile B-pillar.
  • FIG. 2 is a flowchart schematically showing a method for manufacturing a steel product according to an embodiment of the present invention.
  • Hot stamping galvanized steel sheet according to the present invention in weight%, carbon (C): 0.05 ⁇ 0.17%, silicon (Si): 0.01 ⁇ 0.55%, manganese (Mn): 1.0 ⁇ 2.3%, phosphorus (P): 0.04% or less, sulfur (S): 0.015% or less, chromium (Cr): 0.01-0.38%, molybdenum (Mo): 0.001-0.25%, titanium (Ti): 0.03-0.1%, niobium (Nb): 0.004- 0.1%.
  • the galvanized steel sheet for hot stamping in weight%, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and boron (B): 0.001 It may further include one or more of% or less.
  • the remainder is composed of impurities that are inevitably included in iron (Fe) and steelmaking.
  • Carbon (C) is added to secure the strength of the steel. Carbon also serves to stabilize the austenite phase depending on the amount of the austenite phase that is concentrated.
  • the carbon is preferably added at 0.05 to 0.17% by weight of the total weight of the steel sheet. If the added amount of carbon is less than 0.05% by weight, it is difficult to secure sufficient strength. On the contrary, when the content of carbon exceeds 0.17% by weight, the strength is increased, but toughness and weldability may be greatly reduced.
  • Silicon (Si) contributes to improving the strength and elongation of the steel.
  • the silicon is preferably added in 0.01 to 0.55% by weight of the total weight of the steel sheet.
  • the addition amount of silicone is less than 0.01 weight%, the addition effect is inadequate.
  • the amount of silicon added exceeds 0.55% by weight, weldability and plating characteristics may be degraded.
  • Manganese (Mn) contributes to austenite stabilization and also contributes to strength improvement.
  • the manganese is preferably added at 1.0 to 2.3% by weight of the total weight of the steel sheet. If the added amount of manganese is less than 1.0% by weight, the effect of addition is insufficient. On the contrary, when the amount of manganese exceeds 2.3% by weight, there is a problem that the weldability is lowered and the toughness is deteriorated.
  • Phosphorus (P) when excessively contained, greatly reduces the elongation. Therefore, in the present invention, the phosphorus content is limited to 0.04% by weight or less of the total weight of the steel sheet.
  • the sulfur content is limited to 0.015% by weight or less of the total weight of the steel sheet.
  • Chromium (Cr) stabilizes ferrite grains to improve elongation, and enhances carbon concentration in the austenite phase to stabilize the austenite phase, thereby contributing to strength improvement.
  • the chromium is preferably added in 0.01 to 0.38% by weight of the total weight of the steel sheet.
  • the amount of chromium added is less than 0.01% by weight, the effect of addition is insufficient.
  • the amount of chromium added exceeds 0.38% by weight, the strength may be excessively increased after hot stamping, thereby inhibiting the shock absorbing ability.
  • Molybdenum (Mo) is added together with chromium to contribute to the improvement of strength of the steel.
  • the molybdenum is preferably added in 0.001 to 0.25% by weight of the total weight of the steel sheet.
  • the addition amount of molybdenum is less than 0.001% by weight, the effect of addition is insufficient. Conversely, when the addition amount of molybdenum exceeds 0.25 weight%, weldability can be reduced.
  • Titanium (Ti) contributes to improving the elongation of the steel by depositing carbide in the hot stamping process to reduce the carbon content in the steel.
  • the titanium is preferably added in 0.03 ⁇ 0.1% by weight of the total weight of the steel sheet.
  • the addition amount of titanium is less than 0.03% by weight, the addition effect is insufficient.
  • the added amount of titanium exceeds 0.1% by weight, it may cause a decrease in toughness.
  • Niobium (Nb) forms precipitates to refine crystal grains and improve fracture toughness, and precipitates carbides to reduce solid solution carbon content in steel, thereby contributing to the improvement of elongation.
  • the niobium is preferably added in 0.004 to 0.1% by weight of the total weight of the steel sheet.
  • the addition amount of niobium is less than 0.004% by weight, the addition effect is insufficient.
  • the yield strength is excessively increased and there is a problem of decreasing toughness.
  • Nickel (Ni) is an austenite stabilizing element and can contribute to an elongation improvement by controlling austenite transformation.
  • the amount is preferably 0.25% by weight or less of the total weight of the steel sheet.
  • the added amount of nickel exceeds 0.25% by weight, cold workability is lowered, and in particular, the cost of manufacturing steel products can be greatly increased.
  • Tungsten (W) contributes to strength improvement through increasing martensite fraction.
  • the addition amount is preferably 0.05% by weight or less of the total weight of the steel sheet.
  • the added amount of tungsten exceeds 0.05% by weight, tungsten carbide may be formed to increase yield strength, causing springback during hot stamping, and plating characteristics may be degraded.
  • Vanadium (V) contributes to the strength improvement of the steel through the precipitation strengthening effect by the precipitate formation together with niobium.
  • the amount is preferably 0.05% by weight or less of the total weight of the steel sheet. If the added amount of vanadium exceeds 0.05% by weight, there is a problem that low-temperature impact toughness is lowered.
  • Boron (B) precipitates at the austenite grain boundary and delays phase transformation, thereby improving the hardenability of the steel.
  • the amount is preferably 0.001% by weight or less of the total weight of the steel sheet. If the addition amount of boron exceeds 0.001% by weight, there is a problem that the toughness is greatly reduced due to excessive increase in the hardenability.
  • the tensile strength may be 700 to 1200 MPa and an elongation of 12.0% or more, and the shock absorption capacity is most excellent in this strength and elongation range.
  • the resistance strength at the time of collision may be low, thereby increasing the penetration depth, thereby reducing the survival space.
  • the tensile strength after hot stamping exceeds 1200 MPa, the difference in strength from the portion serving as the impact support is too small, and brittle fracture may be caused at the portion serving as the impact support. If the elongation is less than 12.0%, component breakage may occur due to brittle fracture during collision.
  • a plating layer containing zinc for example, a hot dip galvanized layer or an alloyed hot dip galvanized layer is formed on the surface of the steel sheet.
  • an Al-Si-based plating layer or the like may be used.
  • inclusions are formed by melting and incorporating the aluminum component in the plating during the laser welding into the steel plate base material, and thus, brittle fracture may occur in the welding part during the collision.
  • the inclusions are not formed, so that brittle fracture of the weld can be suppressed, and consequently, it may contribute to the improvement of the collision performance.
  • FIG. 2 is a flowchart schematically showing a method for manufacturing a steel product according to an embodiment of the present invention.
  • the illustrated steel product manufacturing method includes a blank welding step S210, a blank heating step S220, and a hot stamping step S230.
  • the steel product may be an automotive part having a heterogeneous strength, more preferably an automobile B filler.
  • the first blank and the second blank are welded.
  • the first blank is a material for forming a second portion (120 of FIG. 1) that absorbs shock in steel products, and as described above, a steel sheet which may exhibit tensile strength of 700 to 1200 MPa and elongation of 12.0% or more after hot stamping. It can be produced by cutting.
  • the first blank is in weight percent, carbon (C): 0.05 to 0.17%, silicon (Si): 0.01 to 0.55%, manganese (Mn): 1.0 to 2.3%, phosphorus (P): 0.04 % Or less, sulfur (S): 0.015% or less, chromium (Cr): 0.01-0.38%, molybdenum (Mo): 0.001-0.25%, titanium (Ti): 0.03-0.1%, niobium (Nb): 0.004-0.1 It can be produced from a galvanized steel sheet containing a%, consisting of the remaining iron (Fe) and unavoidable impurities, and a plating layer containing zinc is formed on the surface.
  • the galvanized steel sheet by weight, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and boron (B): 0.001% or less It may further include.
  • the galvanized steel sheet may be a hot dip galvanized steel sheet or an alloyed hot dip galvanized steel sheet.
  • the second blank is a material for forming the first part (110 in FIG. 1) that supports the impact in the steel product, and as described above, the steel sheet may exhibit tensile strength of 1300 to 1600 MPa and elongation of 6.0 to 10.0% after hot stamping. It can be prepared by cutting.
  • the second blank is a preferred example, in weight percent, carbon (C): 0.12 to 0.42%, silicon (Si): 0.03 to 0.6%, manganese (Mn): 0.8 to 4.0%, phosphorus (P): 0.2% or less , Sulfur (S): 0.1% or less, chromium (Cr): 0.01 ⁇ 1.0% and boron (B): 0.0005 ⁇ 0.03%, by adding one or more of aluminum (Al) and titanium (Ti): 0.05 ⁇ 0.3% , Zinc (Ni) and vanadium (V) of one or more of the sum of: 0.03 ⁇ 4.0%, the remaining iron (Fe) and inevitable impurities, zinc plated with a zinc-plated layer is formed on the surface It can manufacture from a steel plate.
  • first blank and the second blank may be blanks of the same thickness, or may be blanks of different thicknesses according to the required strength or physical properties.
  • the welding may be a laser welding (Laser Welding) method, but is not necessarily limited thereto.
  • the welded first blank and the second blank are heated.
  • heating can be used such as electric resistance heating and induction heating.
  • the 1st blank and the 2nd blank heating temperature are 850-905 degreeC. If the blank heating temperature exceeds 905 ° C., a zinc vaporization (Zn fume) problem may occur. Conversely, when the blank heating temperature is lower than 850 ° C., problems of strength degradation and springback of the parts may occur.
  • the heated first blank and the second blank are put into a mold and molded into a predetermined steel product shape through hot stamping.
  • the hot stamping process includes quenching to about 200 ° C. or less at an average cooling rate of about 50 to 300 ° C./sec simultaneously with or immediately after molding.
  • a post-treatment process such as trimming and piercing may be performed by using laser cutting.
  • the steel product manufactured through the above process is, for example, the first part showing a tensile strength of 1300 to 1600 MPa and an elongation of 6.0 to 10.0%, and a tensile strength of 700 to 1200 MPa and an elongation of 12.0%, for example, the automobile B filler shown in FIG. 1. It may have a second portion indicating the above.
  • the steel sheet specimen having the composition shown in Table 1 and the hot dip galvanized layer formed on the surface was heated to 900 °C for 5 minutes, and then hot stamping.
  • the tensile strength after heating / quenching was 700 to 1200 Mpa and the elongation was 12.0% or more.

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  • Mechanical Engineering (AREA)
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  • Heat Treatment Of Sheet Steel (AREA)
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Abstract

According to the present invention, a galvanized steel sheet for hot stamping comprises by weight%: C: 0.05-0.17%; Si: 0.01-0.55%; Mn: 1.0-2.3%; P: 0.04% or less; S: 0.015% or less; Cr: 0.01-0.38%; Mo: 0.001-0.25%; Ti: 0.03-0.1%; Nb: 0.004-0.1%, and the remainder of Fe and inevitable impurities. A plated layer including zinc is formed on the surface of the galvanized steel sheet, and the galvanized steel sheet after hot stamping exhibits a tensile strength of 700-1200 MPa and tensile modulus of at least 12.0%.

Description

충돌성능이 우수한 핫 스탬핑용 아연도금강판 및 이를 이용한 이종강도를 갖는 강 제품 제조 방법Hot Stamping Galvanized Steel Sheet with Excellent Collision Performance and Steel Product Manufacturing Method with Different Strength
본 발명은 핫 스탬핑을 이용한 강 제품 제조 기술에 관한 것으로, 보다 상세하게는 충돌성능이 향상된 핫 스탬핑용 아연도금강판 및 이를 이용한 이종강도를 갖는 강 제품 제조 방법에 관한 것이다.The present invention relates to a steel product manufacturing technology using hot stamping, and more particularly to a hot-dip galvanized steel sheet for improved impact performance and a steel product manufacturing method having a heterogeneous strength using the same.
차량의 고연비화와 경량화가 추구됨에 따라, 차량 부품들은 지속적으로 고강도화가 이루어지고 있다.As high fuel efficiency and light weight of vehicles are pursued, vehicle parts are continuously made of high strength.
또한, 차량의 각 부분들은 구조적인 특성으로 어떤 부분은 높은 강도가 요구되며, 또 다른 부분은 높은 충격 인성이 요구되는 경우가 있다. 즉, 국부적으로 이종 강도(또는 물성)이 요구되는 부품들이 존재한다.In addition, each part of the vehicle is a structural characteristic, some parts are required to have a high strength, and another part may require a high impact toughness. That is, there are components that require locally heterogeneous strength (or physical properties).
도 1에 개략적으로 도시된 자동차 B필러(100)가 그 예가 될 수 있다. 자동차 B필러(100)의 경우, 상부의 제1부분과 하부의 제2부분을 포함한다. 상부의 제1부분(110)은 충돌시 충격을 지지하는 역할을 하며, 하부의 제2부분(120)은 충돌시 충격을 흡수하는 역할을 한다.An example may be an automobile B-pillar 100 schematically illustrated in FIG. 1. In the case of the automobile B-pillar 100, a first portion of the upper portion and a second portion of the lower portion are included. The first portion 110 of the upper portion serves to support the impact during the collision, and the second portion 120 of the lower portion serves to absorb the impact during the collision.
상기의 자동차 B필러와 같이 이종 강도를 갖는 강 제품의 경우, 각각 정해진 형상으로 제1부분과 제2부분을 제조한 후, 이들을 용접에 의하여 접합하는 방법이 주로 이용되었다. 그런데, 이 방법의 경우, 핫 스탬핑 이후 용접에 의해 발생하는 열에 의해 제1부분 혹은 제2부분의 물성이 변화될 수 있다.In the case of steel products having different strengths, such as the above automobile B-pillar, a method of manufacturing the first part and the second part in a predetermined shape, respectively, and then joining them by welding has been mainly used. However, in this method, the physical properties of the first portion or the second portion may be changed by heat generated by welding after hot stamping.
이를 해결하고자, 최근에는 별도의 용접없이 하나의 강재로 국부적인 핫 스탬핑 혹은 국부 열처리를 적용하여 이종 강도를 갖는 강 제품을 제조하고 있다. 그러나, 이 경우, 고강도를 요하는 부분과 그렇지 않은 부분의 강도 편차가 너무 큰 관계로 고강도를 요하지 않는 부분의 충격흡수능이 불충분한 문제점이 있다.In order to solve this problem, recently, a local hot stamping or a local heat treatment is applied to a single steel without any welding to produce a steel product having heterogeneous strength. However, in this case, there is a problem that the shock absorbing ability of the portion that does not require high strength is insufficient because the strength variation of the portion that requires high strength and the portion that does not require too high strength is too large.
본 발명과 관련된 배경기술로는 대한민국 등록특허공보 제10-1119173호(2012.02.22 공고)에 개시된 레이저 열처리를 이용한 이종강도를 갖는 강 제품 제조 방법 및 이에 이용되는 열처리 경화강이 있다.Background art related to the present invention is a method for producing a steel product having a heterogeneous strength using a laser heat treatment disclosed in Republic of Korea Patent Publication No. 10-1119173 (announced on February 22, 2012) and heat-treated hardened steel used therein.
본 발명의 하나의 목적은 충돌시 충격흡수능력이 우수한 강 제품을 제조할 수 있는 핫 스탬핑용 아연도금강판을 제공하는 것이다.One object of the present invention is to provide a hot stamping galvanized steel sheet that can produce a steel product with excellent impact absorption ability in the event of a collision.
본 발명의 다른 목적은 상기의 핫 스탬핑용 아연도금강판과 경화능이 우수한 아연도금강판을 이용하여 핫 스탬핑법으로 이종강도를 갖는 강 제품을 제조하는 방법을 제공하는 것이다.Another object of the present invention is to provide a method for producing a steel product having a heterogeneous strength by hot stamping method using the galvanized steel sheet for hot stamping and the galvanized steel sheet having excellent hardenability.
상기 하나의 목적을 달성하기 위한 본 발명의 실시예에 따른 열처리 경화형 아연도금강판은 중량%로, 탄소(C) : 0.05~0.17%, 실리콘(Si) : 0.01~0.55%, 망간(Mn) : 1.0~2.3%, 인(P) : 0.04% 이하, 황(S) : 0.015% 이하, 크롬(Cr) : 0.01~0.38%, 몰리브덴(Mo) : 0.001~0.25%, 티타늄(Ti) : 0.03~0.1%, 니오븀(Nb) : 0.004~0.1%를 포함하고, 나머지 철(Fe)과 불가피한 불순물로 이루어지고, 표면에 아연을 포함하는 도금층이 형성되어 있으며, 핫 스탬핑 후 인장강도 700~1200MPa 및 연신율 12.0% 이상을 나타내는 것을 특징으로 한다.Heat-treated hardened galvanized steel sheet according to an embodiment of the present invention for achieving the above one object by weight, carbon (C): 0.05 ~ 0.17%, silicon (Si): 0.01 ~ 0.55%, manganese (Mn): 1.0 ~ 2.3%, Phosphorus (P): 0.04% or less, Sulfur (S): 0.015% or less, Chromium (Cr): 0.01 ~ 0.38%, Molybdenum (Mo): 0.001 ~ 0.25%, Titanium (Ti): 0.03 ~ 0.1%, niobium (Nb): 0.004 ~ 0.1%, consisting of the remaining iron (Fe) and inevitable impurities, a plated layer containing zinc is formed on the surface, tensile strength 700 ~ 1200MPa and elongation after hot stamping It is characterized by showing 12.0% or more.
이때, 상기 아연도금강판은 중량%로, 니켈(Ni) : 0.25% 이하, 텅스텐(W) : 0.05% 이하, 바나듐(V) : 0.05% 이하 및 보론(B) : 0.001% 이하 중 1종 이상을 더 포함할 수 있다.At this time, the galvanized steel sheet by weight, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and boron (B): 0.001% or less It may further include.
또한, 상기 아연도금강판은 용융아연도금강판 또는 합금화용융아연도금강판일 수 있다.In addition, the galvanized steel sheet may be a hot dip galvanized steel sheet or an alloyed hot dip galvanized steel sheet.
상기 다른 목적을 달성하기 위한 본 발명의 실시예에 따른 강 제품 제조 방법은 (a) 중량%로, 탄소(C) : 0.05~0.17%, 실리콘(Si) : 0.01~0.55%, 망간(Mn) : 1.0~2.3%, 인(P) : 0.04% 이하, 황(S) : 0.015% 이하, 크롬(Cr) : 0.01~0.38%, 몰리브덴(Mo) : 0.001~0.25%, 티타늄(Ti) : 0.03~0.1%, 니오븀(Nb) : 0.004~0.1%를 포함하고, 나머지 철(Fe)과 불가피한 불순물로 이루어지고, 표면에 아연을 포함하는 도금층이 형성되어 있는 제1블랭크와, 핫스탬핑 후 인장강도 1300~1600MPa 및 연신율 6.0~10.0%를 나타내는 제2블랭크를 용접하는 단계; (b) 상기 용접된 제1블랭크와 제2블랭크를 가열하는 단계; 및 (c) 상기 가열된 제1블랭크와 제2블랭크를 핫스탬핑하는 단계;를 포함하는 것을 특징으로 한다. Steel product manufacturing method according to an embodiment of the present invention for achieving the above another object is (a) wt%, carbon (C): 0.05 ~ 0.17%, silicon (Si): 0.01 ~ 0.55%, manganese (Mn) : 1.0 ~ 2.3%, Phosphorus (P): 0.04% or less, Sulfur (S): 0.015% or less, Chromium (Cr): 0.01 ~ 0.38%, Molybdenum (Mo): 0.001 ~ 0.25%, Titanium (Ti): 0.03 ~ 0.1%, niobium (Nb): 0.004 to 0.1%, the first blank is made of the remaining iron (Fe) and inevitable impurities, the plated layer containing zinc is formed on the surface, and the tensile strength after hot stamping Welding a second blank exhibiting 1300 to 1600 MPa and an elongation of 6.0 to 10.0%; (b) heating the welded first blank and second blank; And (c) hot stamping the heated first and second blanks.
이때, 상기 제1블랭크는 중량%로, 니켈(Ni) : 0.25% 이하, 텅스텐(W) : 0.05% 이하, 바나듐(V) : 0.05% 이하 및 보론(B) : 0.001% 이하 중 1종 이상을 더 포함할 수 있다. In this case, the first blank is a weight%, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and boron (B): 0.001% or less It may further include.
또한, 상기 제1블랭크는 용융아연도금강판 또는 합금화용융아연도금강판으로부터 제조된 것일 수 있다. In addition, the first blank may be manufactured from a hot dip galvanized steel sheet or an alloyed hot dip galvanized steel sheet.
또한, 상기 제2블랭크는 중량%로, 탄소(C) : 0.12~0.42%, 실리콘(Si) : 0.03~0.6%, 망간(Mn) : 0.8~4.0%, 인(P) : 0.2% 이하, 황(S) : 0.1% 이하, 크롬(Cr) : 0.01~1.0% 및 보론(B) : 0.0005~0.03%, 알루미늄(Al)과 티타늄(Ti) 중 1종 이상의 합산으로 : 0.05~0.3%, 니켈(Ni)과 바나듐(V) 중 1종 이상의 합산으로 : 0.03~4.0%를 포함하고, 나머지 철(Fe)과 불가피한 불순물로 이루어지고, 표면에 아연을 포함하는 도금층이 형성되어 있을 수 있다.In addition, the second blank is a weight%, carbon (C): 0.12 ~ 0.42%, silicon (Si): 0.03 ~ 0.6%, manganese (Mn): 0.8 ~ 4.0%, phosphorus (P): 0.2% or less, Sulfur (S): 0.1% or less, chromium (Cr): 0.01-1.0% and boron (B): 0.0005-0.03%, with the sum of one or more of aluminum (Al) and titanium (Ti): 0.05-0.3%, One or more of nickel (Ni) and vanadium (V): 0.03% to 4.0%, consisting of the remaining iron (Fe) and unavoidable impurities, a plating layer containing zinc on the surface may be formed.
또한, 상기 (b) 단계에서, 상기 제1블랭크와 제2블랭크를 850~905℃로 가열할 수 있다.In addition, in the step (b), the first blank and the second blank may be heated to 850 ~ 905 ℃.
본 발명에 따른 핫스탬핑용 아연도금강판의 경우, 핫 스탬핑 이후 인장강도 700~1200MPa 및 연신율 12.0% 이상을 나타낼 수 있어, 이종 강도를 갖는 강 제품에서 충돌시 충격흡수 역할을 수행하는 부분으로 활용하기 적합하다.In the case of the hot stamping galvanized steel sheet according to the present invention, it can exhibit a tensile strength of 700 ~ 1200MPa and elongation of 12.0% or more after hot stamping, to use as a part to play a role of shock absorption during collision in steel products having different strengths Suitable.
도 1은 자동차 B필러를 개략적으로 나타낸 것이다. 1 schematically shows an automobile B-pillar.
도 2는 본 발명의 실시예에 따른 강 제품 제조 방법을 개략적으로 나타내는 순서도이다. 2 is a flowchart schematically showing a method for manufacturing a steel product according to an embodiment of the present invention.
본 발명의 이점 및 특징, 그리고 그것들을 달성하는 방법은 상세하게 후술되어 있는 실시예들 및 도면을 참조하면 명확해질 것이다. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments and drawings described below in detail.
그러나, 본 발명은 이하에서 개시되는 실시예들에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 수 있으며, 단지 본 실시예들은 본 발명의 개시가 완전하도록 하며, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이며, 본 발명은 청구항의 범주에 의해 정의될 뿐이다.However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only the embodiments are to make the disclosure of the present invention complete, it is common in the art It is provided to fully inform those skilled in the art of the scope of the invention, which is to be defined only by the scope of the claims.
이하, 본 발명에 따른 충돌성능이 우수한 핫 스탬핑용 아연도금강판 및 이를 이용한 이종강도를 갖는 강 제품 제조 방법에 대하여 상세히 설명하기로 한다.Hereinafter, a hot stamping galvanized steel sheet having excellent impact performance according to the present invention and a method of manufacturing a steel product having different strengths using the same will be described in detail.
핫 스탬핑용 아연도금강판Galvanized Steel Sheets for Hot Stamping
본 발명에 따른 핫 스탬핑용 아연도금강판은 중량%로, 탄소(C) : 0.05~0.17%, 실리콘(Si) : 0.01~0.55%, 망간(Mn) : 1.0~2.3%, 인(P) : 0.04% 이하, 황(S) : 0.015% 이하, 크롬(Cr) : 0.01~0.38%, 몰리브덴(Mo) : 0.001~0.25%, 티타늄(Ti) : 0.03~0.1%, 니오븀(Nb) : 0.004~0.1%를 포함한다. Hot stamping galvanized steel sheet according to the present invention in weight%, carbon (C): 0.05 ~ 0.17%, silicon (Si): 0.01 ~ 0.55%, manganese (Mn): 1.0 ~ 2.3%, phosphorus (P): 0.04% or less, sulfur (S): 0.015% or less, chromium (Cr): 0.01-0.38%, molybdenum (Mo): 0.001-0.25%, titanium (Ti): 0.03-0.1%, niobium (Nb): 0.004- 0.1%.
또한, 본 발명에 따른 핫 스탬핑용 아연도금강판은 중량%로, 니켈(Ni) : 0.25% 이하, 텅스텐(W) : 0.05% 이하, 바나듐(V) : 0.05% 이하 및 보론(B) : 0.001% 이하 중 1종 이상을 더 포함할 수 있다.In addition, the galvanized steel sheet for hot stamping according to the present invention in weight%, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and boron (B): 0.001 It may further include one or more of% or less.
상기 성분들 외 나머지는 철(Fe)과 제강 과정 등에서 불가피하게 포함되는 불순물로 이루어진다. In addition to the above components, the remainder is composed of impurities that are inevitably included in iron (Fe) and steelmaking.
이하, 본 발명에 따른 핫 스탬핑용 아연도금강판, 보다 구체적으로는 아연도금층 형성 전의 강판 모재에 포함되는 각 성분의 역할에 대하여 설명하기로 한다. Hereinafter, the role of each component included in the hot stamping galvanized steel sheet, more specifically, the steel sheet base material before forming the galvanized layer will be described.
탄소(C) Carbon (C)
탄소(C)는 강의 강도 확보를 위해 첨가한다. 또한 탄소는 오스테나이트 상에 농화되는 양에 따라 오스테나이트 상을 안정화시키는 역할을 한다. Carbon (C) is added to secure the strength of the steel. Carbon also serves to stabilize the austenite phase depending on the amount of the austenite phase that is concentrated.
상기 탄소는 강판 전체 중량의 0.05~0.17중량%로 첨가되는 것이 바람직하다. 탄소의 첨가량이 0.05중량% 미만일 경우 충분한 강도를 확보하기 어렵다. 반대로, 탄소의 함량이 0.17중량%를 초과하면 강도는 증가하나 인성 및 용접성이 크게 저하될 수 있다. The carbon is preferably added at 0.05 to 0.17% by weight of the total weight of the steel sheet. If the added amount of carbon is less than 0.05% by weight, it is difficult to secure sufficient strength. On the contrary, when the content of carbon exceeds 0.17% by weight, the strength is increased, but toughness and weldability may be greatly reduced.
실리콘(Si)Silicon (Si)
실리콘(Si)은 강의 강도 및 연신율 향상에 기여한다. Silicon (Si) contributes to improving the strength and elongation of the steel.
상기 실리콘은 강판 전체 중량의 0.01~0.55중량%로 첨가되는 것이 바람직하다. 실리콘의 첨가량이 0.01중량% 미만일 경우, 그 첨가 효과가 불충분하다. 반대로, 실리콘의 첨가량이 0.55중량%를 초과하는 경우, 용접성 및 도금 특성이 저하될 수 있다.The silicon is preferably added in 0.01 to 0.55% by weight of the total weight of the steel sheet. When the addition amount of silicone is less than 0.01 weight%, the addition effect is inadequate. Conversely, when the amount of silicon added exceeds 0.55% by weight, weldability and plating characteristics may be degraded.
망간(Mn)Manganese (Mn)
망간(Mn)은 오스테나이트 안정화에 기여하며, 또한 강도 향상에 기여한다. Manganese (Mn) contributes to austenite stabilization and also contributes to strength improvement.
상기 망간은 강판 전체 중량의 1.0~2.3중량%로 첨가되는 것이 바람직하다. 망간의 첨가량이 1.0중량% 미만일 경우 그 첨가 효과가 불충분하다. 반대로, 망간의 첨가량이 2.3중량%를 초과하는 경우, 용접성이 저하되고 인성이 열화되는 문제점이 있다.The manganese is preferably added at 1.0 to 2.3% by weight of the total weight of the steel sheet. If the added amount of manganese is less than 1.0% by weight, the effect of addition is insufficient. On the contrary, when the amount of manganese exceeds 2.3% by weight, there is a problem that the weldability is lowered and the toughness is deteriorated.
인(P), 황(S)Phosphorus (P), Sulfur (S)
인(P)은 과다 함유될 경우, 연신율을 크게 저하시킨다. 이에 본 발명에서는 인의 함량을 강판 전체 중량의 0.04중량% 이하로 제한하였다. Phosphorus (P), when excessively contained, greatly reduces the elongation. Therefore, in the present invention, the phosphorus content is limited to 0.04% by weight or less of the total weight of the steel sheet.
또한, 황(S)은 과다 함유될 경우 MnS 개재물의 과다 생성하여 취성을 유발한다. 이에, 본 발명에서는 황의 함량을 강판 전체 중량의 0.015중량% 이하로 제한하였다.In addition, when sulfur (S) is contained in excess, excessive generation of MnS inclusions causes brittleness. Thus, in the present invention, the sulfur content is limited to 0.015% by weight or less of the total weight of the steel sheet.
크롬(Cr)Chrome (Cr)
크롬(Cr)은 페라이트 결정립을 안정화하여 연신율을 향상시키며, 오스테나이트 상 내 탄소 농화량을 증진하여 오스테나이트 상을 안정화시킴으로써 강도 향상에 기여한다. Chromium (Cr) stabilizes ferrite grains to improve elongation, and enhances carbon concentration in the austenite phase to stabilize the austenite phase, thereby contributing to strength improvement.
상기 크롬은 강판 전체 중량의 0.01~0.38중량%로 첨가되는 것이 바람직하다. 크롬의 첨가량이 0.01중량% 미만일 경우, 그 첨가 효과가 불충분하다. 반대로, 크롬의 첨가량이 0.38중량%를 초과하면, 핫 스탬핑 이후 강도가 지나치게 증가하여 충격흡수능을 저해시킬 수 있다. The chromium is preferably added in 0.01 to 0.38% by weight of the total weight of the steel sheet. When the amount of chromium added is less than 0.01% by weight, the effect of addition is insufficient. On the contrary, when the amount of chromium added exceeds 0.38% by weight, the strength may be excessively increased after hot stamping, thereby inhibiting the shock absorbing ability.
몰리브덴(Mo)Molybdenum (Mo)
몰리브덴(Mo)은 크롬과 함께 첨가되어 강의 강도 향상에 기여한다.Molybdenum (Mo) is added together with chromium to contribute to the improvement of strength of the steel.
상기 몰리브덴은 강판 전체 중량의 0.001~0.25중량%로 첨가되는 것이 바람직하다. 몰리브덴의 첨가량이 0.001중량% 미만일 경우, 그 첨가 효과가 불충분하다. 반대로, 몰리브덴의 첨가량이 0.25중량%를 초과하는 경우, 용접성을 저하시킬 수 있다. The molybdenum is preferably added in 0.001 to 0.25% by weight of the total weight of the steel sheet. When the addition amount of molybdenum is less than 0.001% by weight, the effect of addition is insufficient. Conversely, when the addition amount of molybdenum exceeds 0.25 weight%, weldability can be reduced.
티타늄(Ti)Titanium (Ti)
티타늄(Ti)은 핫 스탬핑 공정에서 탄화물을 석출하여 강중 탄소함량을 저감시킴으로써 강의 연신율 향상에 기여한다. Titanium (Ti) contributes to improving the elongation of the steel by depositing carbide in the hot stamping process to reduce the carbon content in the steel.
상기 티타늄은 강판 전체 중량의 0.03~0.1중량%로 첨가되는 것이 바람직하다. 티타늄의 첨가량이 0.03중량% 미만일 경우, 그 첨가 효과가 불충분하다. 반대로, 티타늄의 첨가량이 0.1 중량%를 초과하면 인성 저하를 초래할 수 있다. The titanium is preferably added in 0.03 ~ 0.1% by weight of the total weight of the steel sheet. When the addition amount of titanium is less than 0.03% by weight, the addition effect is insufficient. Conversely, when the added amount of titanium exceeds 0.1% by weight, it may cause a decrease in toughness.
니오븀(Nb)Niobium (Nb)
니오븀(Nb)은 석출물을 형성하여 결정립을 미세화시키고 파괴인성을 향상시키며, 탄화물을 석출하여 강중 고용탄소함량을 저감하여 연신율 향상에 기여한다. Niobium (Nb) forms precipitates to refine crystal grains and improve fracture toughness, and precipitates carbides to reduce solid solution carbon content in steel, thereby contributing to the improvement of elongation.
상기 니오븀은 강판 전체 중량의 0.004~0.1중량%로 첨가되는 것이 바람직하다. 니오븀의 첨가량이 0.004중량% 미만일 경우, 그 첨가 효과가 불충분하다. 반대로, 니오븀의 첨가량이 0.1중량%를 초과하여 다량 첨가될 경우에는 항복강도가 과다하게 증가하고, 인성을 저하시키는 문제가 있다. The niobium is preferably added in 0.004 to 0.1% by weight of the total weight of the steel sheet. When the addition amount of niobium is less than 0.004% by weight, the addition effect is insufficient. On the contrary, when a large amount of niobium is added in excess of 0.1% by weight, the yield strength is excessively increased and there is a problem of decreasing toughness.
니켈(Ni)Nickel (Ni)
니켈(Ni)은 오스테나이트 안정화 원소로 오스테나이트 변태제어로 연신율 향상에 기여할 수 있다. Nickel (Ni) is an austenite stabilizing element and can contribute to an elongation improvement by controlling austenite transformation.
상기 니켈이 첨가될 경우, 그 첨가량은 강판 전체 중량의 0.25중량% 이하인 것이 바람직하다. 니켈의 첨가량이 0.25중량%를 초과하는 경우, 냉간가공성을 저하시키며, 특히 강 제품 제조 비용을 크게 상승시킬 수 있다. When the nickel is added, the amount is preferably 0.25% by weight or less of the total weight of the steel sheet. When the added amount of nickel exceeds 0.25% by weight, cold workability is lowered, and in particular, the cost of manufacturing steel products can be greatly increased.
텅스텐(W)Tungsten (W)
텅스텐(W)은 마르텐사이트 분율 증가를 통한 강도 향상에 기여한다.Tungsten (W) contributes to strength improvement through increasing martensite fraction.
상기 텅스텐이 첨가될 경우, 그 첨가량은 강판 전체 중량의 0.05중량% 이하인 것이 바람직하다. 텅스텐의 첨가량이 0.05중량%를 초과하는 경우, 텅스텐 카바이드를 형성하여 항복강도를 증가시켜 핫 스탬핑시 스프링백을 유발할 수 있고, 도금특성이 저하될 수 있다. When the tungsten is added, the addition amount is preferably 0.05% by weight or less of the total weight of the steel sheet. When the added amount of tungsten exceeds 0.05% by weight, tungsten carbide may be formed to increase yield strength, causing springback during hot stamping, and plating characteristics may be degraded.
바나듐(V)Vanadium (V)
바나듐(V)은 상기의 니오븀과 함께 석출물 형성에 의한 석출강화 효과를 통하여 강의 강도 향상에 기여한다. Vanadium (V) contributes to the strength improvement of the steel through the precipitation strengthening effect by the precipitate formation together with niobium.
상기 바나듐이 첨가될 경우, 그 첨가량은 강판 전체 중량의 0.05중량% 이하인 것이 바람직하다. 바나듐의 첨가량이 0.05중량%를 초과하는 경우, 저온 충격인성이 저하되는 문제점이 있다. When the vanadium is added, the amount is preferably 0.05% by weight or less of the total weight of the steel sheet. If the added amount of vanadium exceeds 0.05% by weight, there is a problem that low-temperature impact toughness is lowered.
보론(B)Boron (B)
보론(B)은 오스테나이트 입계에 석출되어 상변태를 지연시킴으로써 강의 경화능을 향상시킨다. Boron (B) precipitates at the austenite grain boundary and delays phase transformation, thereby improving the hardenability of the steel.
상기 보론이 첨가될 경우, 그 첨가량은 강판 전체 중량의 0.001중량% 이하인 것이 바람직하다. 보론의 첨가량이 0.001중량%를 초과하는 경우, 과도한 소입성 상승으로 인성이 크게 저하되는 문제점이 있다.When the boron is added, the amount is preferably 0.001% by weight or less of the total weight of the steel sheet. If the addition amount of boron exceeds 0.001% by weight, there is a problem that the toughness is greatly reduced due to excessive increase in the hardenability.
상기 조성을 갖는 아연도금강판의 경우, 대략 900℃ 정도의 핫 스탬핑 후, 인장강도 700~1200MPa 및 연신율 12.0% 이상을 나타낼 수 있으며, 이러한 강도 및 연신율 범위에서 충격흡수능력이 가장 우수하다. In the case of a galvanized steel sheet having the above composition, after hot stamping at about 900 ° C., the tensile strength may be 700 to 1200 MPa and an elongation of 12.0% or more, and the shock absorption capacity is most excellent in this strength and elongation range.
핫 스탬핑 이후 인장강도가 700MPa 미만일 경우 충돌시 저항강도가 낮아 침입 깊이가 커져서 생존공간 축소될 수 있다. 반대로, 핫 스탬핑 이후 인장강도가 1200MPa을 초과하는 경우, 충격지지 역할을 하는 부분과 강도 차이가 너무 적어, 충격지지 역할을 하는 부분에서 취성파괴가 유발될 수 있다. 연신율이 12.0% 미만일 경우, 충돌시 취성파괴에 의한 부품깨짐 현상이 발생할 수 있다. If the tensile strength is less than 700MPa after hot stamping, the resistance strength at the time of collision may be low, thereby increasing the penetration depth, thereby reducing the survival space. On the contrary, in the case where the tensile strength after hot stamping exceeds 1200 MPa, the difference in strength from the portion serving as the impact support is too small, and brittle fracture may be caused at the portion serving as the impact support. If the elongation is less than 12.0%, component breakage may occur due to brittle fracture during collision.
한편, 본 발명에 따른 아연도금강판의 경우, 강판 표면에 아연을 포함하는 도금층, 예를 들어 용융아연도금층 혹은 합금화용융아연도금층이 형성되어 있다. On the other hand, in the galvanized steel sheet according to the present invention, a plating layer containing zinc, for example, a hot dip galvanized layer or an alloyed hot dip galvanized layer is formed on the surface of the steel sheet.
이러한 아연도금층이 형성되어 있지 않은 경우, 핫 스탬핑을 위한 강판 가열시 표면이 산화되어 방청성을 기대하기 어렵다. When such a galvanized layer is not formed, the surface is oxidized at the time of heating the steel sheet for hot stamping, so it is difficult to expect rust resistance.
물론, Al-Si계 도금층 등을 이용할 수 있으나, 이 경우, 레이저 용접시 도금내 알루미늄 성분이 강판 모재로 용융되어 혼입됨으로써 개재물을 형성하고, 이에 따라 충돌시 용접부에서 취성 파괴가 발생할 수 있다. 그러나, 아연도금강판의 경우, 레이저 용접시 강판 모재로 아연 성분이 혼입되더라도 개재물을 형성하지 않으므로 용접부 취성파괴가 억제될 수 있으며, 그 결과 충돌성능 향상에 기여할 수 있다. Of course, an Al-Si-based plating layer or the like may be used. In this case, inclusions are formed by melting and incorporating the aluminum component in the plating during the laser welding into the steel plate base material, and thus, brittle fracture may occur in the welding part during the collision. However, in the case of galvanized steel sheet, even if the zinc component is mixed into the base steel sheet during laser welding, the inclusions are not formed, so that brittle fracture of the weld can be suppressed, and consequently, it may contribute to the improvement of the collision performance.
강 제품 제조 방법Steel product manufacturing method
도 2는 본 발명의 실시예에 따른 강 제품 제조 방법을 개략적으로 나타내는 순서도이다. 2 is a flowchart schematically showing a method for manufacturing a steel product according to an embodiment of the present invention.
도 2를 참조하면, 도시된 강 제품 제조 방법은 블랭크 용접 단계(S210), 블랭크 가열 단계(S220) 및 핫 스탬핑 단계(S230)를 포함한다. Referring to FIG. 2, the illustrated steel product manufacturing method includes a blank welding step S210, a blank heating step S220, and a hot stamping step S230.
여기서, 강 제품이라 함은 이종강도를 갖는 자동차용 부품, 보다 바람직하게는 자동차 B 필러가 될 수 있다. Here, the steel product may be an automotive part having a heterogeneous strength, more preferably an automobile B filler.
블랭크 용접 단계(S210)에서는 제1블랭크와, 제2블랭크를 용접한다. In the blank welding step S210, the first blank and the second blank are welded.
제1블랭크는 강 제품에서 충격을 흡수하는 제2부분(도 1의 120)를 형성하기 위한 소재로, 전술한 바와 같이 핫 스탬핑 후 인장강도 700~1200MPa 및 연신율 12.0% 이상을 나타낼 수 있는 강판을 절단하여 제조할 수 있다. The first blank is a material for forming a second portion (120 of FIG. 1) that absorbs shock in steel products, and as described above, a steel sheet which may exhibit tensile strength of 700 to 1200 MPa and elongation of 12.0% or more after hot stamping. It can be produced by cutting.
이러한 제1블랭크는 전술한 바와 같이, 중량%로, 탄소(C) : 0.05~0.17%, 실리콘(Si) : 0.01~0.55%, 망간(Mn) : 1.0~2.3%, 인(P) : 0.04% 이하, 황(S) : 0.015% 이하, 크롬(Cr) : 0.01~0.38%, 몰리브덴(Mo) : 0.001~0.25%, 티타늄(Ti) : 0.03~0.1%, 니오븀(Nb) : 0.004~0.1%를 포함하고, 나머지 철(Fe)과 불가피한 불순물로 이루어지고, 표면에 아연을 포함하는 도금층이 형성되어 있는 아연도금강판으로부터 제조할 수 있다. As described above, the first blank is in weight percent, carbon (C): 0.05 to 0.17%, silicon (Si): 0.01 to 0.55%, manganese (Mn): 1.0 to 2.3%, phosphorus (P): 0.04 % Or less, sulfur (S): 0.015% or less, chromium (Cr): 0.01-0.38%, molybdenum (Mo): 0.001-0.25%, titanium (Ti): 0.03-0.1%, niobium (Nb): 0.004-0.1 It can be produced from a galvanized steel sheet containing a%, consisting of the remaining iron (Fe) and unavoidable impurities, and a plating layer containing zinc is formed on the surface.
이때, 아연도금강판은 중량%로, 니켈(Ni) : 0.25% 이하, 텅스텐(W) : 0.05% 이하, 바나듐(V) : 0.05% 이하 및 보론(B) : 0.001% 이하 중 1종 이상을 더 포함할 수 있다. At this time, the galvanized steel sheet by weight, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and boron (B): 0.001% or less It may further include.
또한, 아연도금강판은 용융아연도금강판 또는 합금화용융아연도금강판일 수 있다. In addition, the galvanized steel sheet may be a hot dip galvanized steel sheet or an alloyed hot dip galvanized steel sheet.
제2블랭크는 강 제품에서 충격을 지지하는 제1부분(도 1의 110)를 형성하기 위한 소재로, 전술한 바와 같이 핫 스탬핑 후 인장강도 1300~1600MPa 및 연신율 6.0~10.0%를 나타낼 수 있는 강판을 절단하여 제조할 수 있다.The second blank is a material for forming the first part (110 in FIG. 1) that supports the impact in the steel product, and as described above, the steel sheet may exhibit tensile strength of 1300 to 1600 MPa and elongation of 6.0 to 10.0% after hot stamping. It can be prepared by cutting.
이러한 제2블랭크는 바람직한 예로, 중량%로, 탄소(C) : 0.12~0.42%, 실리콘(Si) : 0.03~0.6%, 망간(Mn) : 0.8~4.0%, 인(P) : 0.2% 이하, 황(S) : 0.1% 이하, 크롬(Cr) : 0.01~1.0% 및 보론(B) : 0.0005~0.03%, 알루미늄(Al)과 티타늄(Ti) 중 1종 이상의 합산으로 : 0.05~0.3%, 니켈(Ni)과 바나듐(V) 중 1종 이상의 합산으로 : 0.03~4.0%를 포함하고, 나머지 철(Fe)과 불가피한 불순물로 이루어지고, 표면에 아연을 포함하는 도금층이 형성되어 있는 아연도금강판으로부터 제조할 수 있다. The second blank is a preferred example, in weight percent, carbon (C): 0.12 to 0.42%, silicon (Si): 0.03 to 0.6%, manganese (Mn): 0.8 to 4.0%, phosphorus (P): 0.2% or less , Sulfur (S): 0.1% or less, chromium (Cr): 0.01 ~ 1.0% and boron (B): 0.0005 ~ 0.03%, by adding one or more of aluminum (Al) and titanium (Ti): 0.05 ~ 0.3% , Zinc (Ni) and vanadium (V) of one or more of the sum of: 0.03 ~ 4.0%, the remaining iron (Fe) and inevitable impurities, zinc plated with a zinc-plated layer is formed on the surface It can manufacture from a steel plate.
한편, 제1블랭크와 제2블랭크는 동일한 두께의 블랭크들일 수 있으며, 또한, 요구되는 강도 혹은 물성에 따라서 서로 다른 두께의 블랭크들일 수도 있다. Meanwhile, the first blank and the second blank may be blanks of the same thickness, or may be blanks of different thicknesses according to the required strength or physical properties.
그리고, 용접은 레이저 용접(Laser Welding) 방식이 이용될 수 있으나, 반드시 이에 제한되는 것은 아니다. And, the welding may be a laser welding (Laser Welding) method, but is not necessarily limited thereto.
다음으로, 블랭크 가열 단계(S220)에서는 용접된 제1블랭크와 제2블랭크를 가열한다. 가열은 블랭크를 900℃이상의 가열로에 넣어 가열하는 방법 외에도 전기저항가열, 유도가열 등의 방법이 이용될 수 있다. Next, in the blank heating step (S220), the welded first blank and the second blank are heated. In addition to heating the blank in a heating furnace of 900 ° C or more, heating can be used such as electric resistance heating and induction heating.
제1블랭크와 제2블랭크 가열 온도는 850~905℃인 것이 바람직하다. 블랭크 가열 온도가 905℃를 초과하는 경우, 아연 기화(Zn fume) 문제가 발생할 수 있다. 반대로, 블랭크 가열 온도가 850℃보다 낮을 경우, 강도저하 및 부품의 스프링백 문제가 발생할 수 있다.It is preferable that the 1st blank and the 2nd blank heating temperature are 850-905 degreeC. If the blank heating temperature exceeds 905 ° C., a zinc vaporization (Zn fume) problem may occur. Conversely, when the blank heating temperature is lower than 850 ° C., problems of strength degradation and springback of the parts may occur.
다음으로, 핫 스탬핑 단계(S230)에서는 가열된 제1블랭크와 제2블랭크를 금형 내에 투입하여 핫 스탬핑을 통하여 미리 정해진 강 제품 형상으로 성형한다. Next, in the hot stamping step (S230), the heated first blank and the second blank are put into a mold and molded into a predetermined steel product shape through hot stamping.
핫 스탬핑 과정에는, 성형과 동시에 혹은 성형 직후에 대략 50~300℃/sec의 평균냉각속도로 대략 200℃ 이하까지 급냉하는 과정이 포함된다. The hot stamping process includes quenching to about 200 ° C. or less at an average cooling rate of about 50 to 300 ° C./sec simultaneously with or immediately after molding.
핫 스탬핑에 의한 강 제품 성형 이후에는 레이저 절단가공 등을 이용하여, 트리밍, 피어싱 등의 후처리 공정이 수행될 수 있다. After forming the steel product by hot stamping, a post-treatment process such as trimming and piercing may be performed by using laser cutting.
상기 과정을 통해 제조되는 강 제품은 예를 들어 도 1에 도시된 자동차 B필러와 같이, 인장강도 1300~1600MPa 및 연신율 6.0~10.0%를 나타내는 제1부분과, 인장강도 700~1200MPa 및 연신율 12.0% 이상을 나타내는 제2부분을 가질 수 있다. The steel product manufactured through the above process is, for example, the first part showing a tensile strength of 1300 to 1600 MPa and an elongation of 6.0 to 10.0%, and a tensile strength of 700 to 1200 MPa and an elongation of 12.0%, for example, the automobile B filler shown in FIG. 1. It may have a second portion indicating the above.
실시예Example
이하, 본 발명의 바람직한 실시예를 통해 본 발명의 구성 및 작용을 더욱 상세히 설명하기로 한다. 다만, 이는 본 발명의 바람직한 예시로 제시된 것이며 어떠한 의미로도 이에 의해 본 발명이 제한되는 것으로 해석될 수는 없다. Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. However, this is presented as a preferred example of the present invention and in no sense can be construed as limiting the present invention.
여기에 기재되지 않은 내용은 이 기술 분야에서 숙련된 자이면 충분히 기술적으로 유추할 수 있는 것이므로 그 설명을 생략하기로 한다.Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.
1. 시편의 제조 1. Preparation of Specimen
합금 성분에 따른 아연도금강판의 핫 스탬핑 후 충돌시 충격흡수능을 살펴보기 위하여, 표 1에 기재된 조성을 가지며 표면에 용융아연도금층이 형성된 강판 시편을 900℃로 5분간 가열 후, 핫 스탬핑을 수행하였다. In order to examine the impact absorbing ability during the impact after hot stamping the galvanized steel sheet according to the alloy component, the steel sheet specimen having the composition shown in Table 1 and the hot dip galvanized layer formed on the surface was heated to 900 ℃ for 5 minutes, and then hot stamping.
[표 1] (단위 : 중량%)[Table 1] (Unit: weight%)
Figure PCTKR2013011192-appb-I000001
Figure PCTKR2013011192-appb-I000001
[표 2]TABLE 2
Figure PCTKR2013011192-appb-I000002
Figure PCTKR2013011192-appb-I000002
표 2를 참조하면, 본 발명에서 제시한 성분 조건을 만족하는 시편 11~23의 경우, 가열/급냉 이후 인장강도 700~1200Mpa 및 연신율 12.0% 이상을 나타내었다. Referring to Table 2, in the case of specimens 11 to 23 satisfying the component conditions presented in the present invention, the tensile strength after heating / quenching was 700 to 1200 Mpa and the elongation was 12.0% or more.
그러나, 탄소, 실리콘, 망간, 크롬, 티타늄 등이 본 발명에서 제시한 범위를 벗어난, 시편 1~10, 24~27의 경우, 강도 및 연신율이 모두 상기 범위를 만족하는 것은 아니었다. However, in the case of specimens 1 to 10 and 24 to 27, in which carbon, silicon, manganese, chromium, titanium and the like were outside the ranges set forth in the present invention, the strength and the elongation did not all satisfy the above range.
본 발명은 도면에 도시된 실시예를 참고로 하여 설명되었으나, 이는 예시적인 것에 불과하며, 당해 기술이 속하는 분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다.Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand.
따라서, 본 발명의 진정한 기술적 보호범위는 아래의 특허청구범위에 의해서 정하여져야 할 것이다. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

Claims (10)

  1. 중량%로, 탄소(C) : 0.05~0.17%, 실리콘(Si) : 0.01~0.55%, 망간(Mn) : 1.0~2.3%, 인(P) : 0.04% 이하, 황(S) : 0.015% 이하, 크롬(Cr) : 0.01~0.38%, 몰리브덴(Mo) : 0.001~0.25%, 티타늄(Ti) : 0.03~0.1%, 니오븀(Nb) : 0.004~0.1%를 포함하고, 나머지 철(Fe)과 불가피한 불순물로 이루어지고, By weight%, carbon (C): 0.05 to 0.17%, silicon (Si): 0.01 to 0.55%, manganese (Mn): 1.0 to 2.3%, phosphorus (P): 0.04% or less, sulfur (S): 0.015% Chromium (Cr): 0.01 to 0.38%, molybdenum (Mo): 0.001 to 0.25%, titanium (Ti): 0.03 to 0.1%, niobium (Nb): 0.004 to 0.1%, and the remaining iron (Fe) And inevitable impurities,
    표면에 아연을 포함하는 도금층이 형성되어 있으며, The plating layer containing zinc is formed on the surface,
    핫 스탬핑 후 인장강도 700~1200MPa 및 연신율 12.0% 이상을 나타내는 것을 특징으로 하는 핫스탬핑용 아연도금강판.Hot stamping galvanized steel sheet for hot stamping, characterized in that the tensile strength 700 ~ 1200MPa and elongation 12.0% or more.
  2. 제1항에 있어서,The method of claim 1,
    상기 아연도금강판은The galvanized steel sheet
    중량%로, 니켈(Ni) : 0.25% 이하, 텅스텐(W) : 0.05% 이하, 바나듐(V) : 0.05% 이하 및 보론(B) : 0.001% 이하 중 1종 이상을 더 포함하는 것을 특징으로 하는 핫스탬핑용 아연도금강판. By weight%, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and further comprises at least one of boron (B): 0.001% or less Hot dipped galvanized steel sheet.
  3. 제1항에 있어서,The method of claim 1,
    상기 아연도금강판은 The galvanized steel sheet
    용융아연도금강판 또는 합금화용융아연도금강판인 것을 특징으로 하는 핫스탬핑용 아연도금강판.Hot-dipped galvanized steel sheet, characterized in that the hot-dip galvanized steel sheet or alloyed hot-dip galvanized steel sheet.
  4. (a) 중량%로, 탄소(C) : 0.05~0.17%, 실리콘(Si) : 0.01~0.55%, 망간(Mn) : 1.0~2.3%, 인(P) : 0.04% 이하, 황(S) : 0.015% 이하, 크롬(Cr) : 0.01~0.38%, 몰리브덴(Mo) : 0.001~0.25%, 티타늄(Ti) : 0.03~0.1%, 니오븀(Nb) : 0.004~0.1%를 포함하고, 나머지 철(Fe)과 불가피한 불순물로 이루어지고, 표면에 아연을 포함하는 도금층이 형성되어 있는 제1블랭크와, 핫스탬핑 후 인장강도 1300~1600MPa 및 연신율 6.0~10.0%를 나타내는 제2블랭크를 용접하는 단계;(a) By weight%, carbon (C): 0.05 to 0.17%, silicon (Si): 0.01 to 0.55%, manganese (Mn): 1.0 to 2.3%, phosphorus (P): 0.04% or less, sulfur (S) : 0.015% or less, Chromium (Cr): 0.01-0.38%, Molybdenum (Mo): 0.001-0.25%, Titanium (Ti): 0.03-0.1%, Niobium (Nb): 0.004 ~ 0.1%, and the remaining iron Welding a first blank made of (Fe) and an unavoidable impurity, and having a plated layer including zinc formed thereon, and a second blank exhibiting tensile strength of 1300 to 1600 MPa and elongation of 6.0 to 10.0% after hot stamping;
    (b) 상기 용접된 제1블랭크와 제2블랭크를 가열하는 단계; 및(b) heating the welded first blank and second blank; And
    (c) 상기 가열된 제1블랭크와 제2블랭크를 핫스탬핑하는 단계;를 포함하는 것을 특징으로 하는 이종강도를 갖는 강 제품 제조 방법. and (c) hot stamping the heated first and second blanks.
  5. 제4항에 있어서, The method of claim 4, wherein
    상기 제1블랭크는 The first blank is
    중량%로, 니켈(Ni) : 0.25% 이하, 텅스텐(W) : 0.05% 이하, 바나듐(V) : 0.05% 이하 및 보론(B) : 0.001% 이하 중 1종 이상을 더 포함하는 것을 특징으로 하는 이종강도를 갖는 강 제품 제조 방법.By weight%, nickel (Ni): 0.25% or less, tungsten (W): 0.05% or less, vanadium (V): 0.05% or less and further comprises at least one of boron (B): 0.001% or less Steel product manufacturing method having a heterogeneous strength.
  6. 제4항에 있어서,The method of claim 4, wherein
    상기 제1블랭크는The first blank is
    용융아연도금강판 또는 합금화용융아연도금강판으로부터 제조된 것을 특징으로 하는 이종강도를 갖는 강 제품 제조 방법. A method for producing a steel product having a heterogeneous strength, characterized in that it is produced from a hot-dip galvanized steel sheet or an alloyed hot-dip galvanized steel sheet.
  7. 제4항에 있어서, The method of claim 4, wherein
    상기 제2블랭크는 The second blank is
    중량%로, 탄소(C) : 0.12~0.42%, 실리콘(Si) : 0.03~0.6%, 망간(Mn) : 0.8~4.0%, 인(P) : 0.2% 이하, 황(S) : 0.1% 이하, 크롬(Cr) : 0.01~1.0% 및 보론(B) : 0.0005~0.03%, 알루미늄(Al)과 티타늄(Ti) 중 1종 이상의 합산으로 : 0.05~0.3%, 니켈(Ni)과 바나듐(V) 중 1종 이상의 합산으로 : 0.03~4.0%를 포함하고, 나머지 철(Fe)과 불가피한 불순물로 이루어지고, 표면에 아연을 포함하는 도금층이 형성되어 있는 것을 특징으로 하는 이종강도를 갖는 강 제품 제조 방법.By weight%, carbon (C): 0.12 ~ 0.42%, silicon (Si): 0.03 ~ 0.6%, manganese (Mn): 0.8 ~ 4.0%, phosphorus (P): 0.2% or less, sulfur (S): 0.1% Or less, chromium (Cr): 0.01 ~ 1.0% and boron (B): 0.0005 ~ 0.03%, the sum of one or more of aluminum (Al) and titanium (Ti): 0.05 ~ 0.3%, nickel (Ni) and vanadium ( V) Steel products with heterogeneous strength, comprising 0.03 ~ 4.0%, consisting of remaining iron (Fe) and unavoidable impurities, and a plating layer containing zinc is formed on the surface. Manufacturing method.
  8. 제4항에 있어서,The method of claim 4, wherein
    상기 (b) 단계는 Step (b) is
    상기 제1블랭크와 제2블랭크를 850~905℃로 가열하는 것을 특징으로 하는 이종강도를 갖는 강 제품 제조 방법.Method for producing a steel product having a heterogeneous strength, characterized in that for heating the first blank and the second blank to 850 ~ 905 ℃.
  9. 제4항 내지 제8항 중 어느 하나의 항에 기재된 방법으로 제조되어, 인장강도 1300~1600MPa 및 연신율 6.0~10.0%를 나타내는 제1부분과, 상기 제1부분과 용접되어 있으며 인장강도 700~1200MPa 및 연신율 12.0% 이상을 나타내는 제2부분을 포함하는 것을 특징으로 하는 된 강 제품.A first part prepared by the method according to any one of claims 4 to 8, which exhibits a tensile strength of 1300 to 1600 MPa and an elongation of 6.0 to 10.0%, and is welded to the first portion and has a tensile strength of 700 to 1200 MPa. And a second portion exhibiting an elongation of at least 12.0%.
  10. 제9항에 있어서,The method of claim 9,
    상기 강 제품은 The steel product
    자동차 B필러인 것을 특징으로 하는 이종강도를 갖는 강 제품.Steel products having heterogeneous strength, characterized in that the automobile B-pillar.
PCT/KR2013/011192 2012-12-12 2013-12-05 Galvanized steel sheet for hot stamping and having excellent impact characteristics, and method for manufacturing steel product having different strengths using same WO2014092376A1 (en)

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