WO2019080492A1 - 一种高强度优良低温韧性船用钢及其一钢多级热处理工艺 - Google Patents

一种高强度优良低温韧性船用钢及其一钢多级热处理工艺

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WO2019080492A1
WO2019080492A1 PCT/CN2018/088338 CN2018088338W WO2019080492A1 WO 2019080492 A1 WO2019080492 A1 WO 2019080492A1 CN 2018088338 W CN2018088338 W CN 2018088338W WO 2019080492 A1 WO2019080492 A1 WO 2019080492A1
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quenching
steel
tempering
heat treatment
heat preservation
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PCT/CN2018/088338
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English (en)
French (fr)
Chinese (zh)
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谢章龙
王攀峰
靳星
张丙军
胡其龙
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南京钢铁股份有限公司
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Priority to KR1020207010336A priority Critical patent/KR102222958B1/ko
Publication of WO2019080492A1 publication Critical patent/WO2019080492A1/zh

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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
    • C22C38/18—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
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Definitions

  • the invention belongs to the technical field of metallurgy, relates to marine steel and heat treatment process thereof, and in particular relates to a high strength and excellent low temperature toughness marine steel and a steel multi-stage heat treatment process.
  • CN 103361551A discloses "a VN microalloyed high-strength refractory ship plate and a manufacturing method thereof", and by adding various alloying elements such as V, Ti, Nb, etc., the effect of fine grain strengthening and precipitation strengthening is used to improve the steel plate.
  • Strength and impact toughness, but yield strength is only 395 MPa, and only provides impact toughness at -20 °C.
  • Chinese Patent No. CN 104357742A discloses "large-thickness hot-rolled steel sheet for marine engineering of 420MPa class and its production method", and optimizes the ratio of other alloying elements in the steel sheet by using low-cost solid solution strengthening of C and Mn. The strength of the steel sheet is ensured in the case of the use of precious metals, but the impact absorption at -40 ° C is only 88 J.
  • the technical problem to be solved by the present invention is to solve the problems of different alloy composition schemes, high alloy cost and complicated production process in the prior art in different strength grades and different thicknesses of marine steel, and to provide a high strength and excellent low temperature toughness marine steel and Its steel multi-stage heat treatment process can be used for high strength and excellent low temperature toughness marine steel composition and one steel multi-stage (E460-E550) flexible manufacturing process.
  • a high-strength and low-temperature toughness marine steel The chemical composition of the marine steel is as follows: C: 0.12-0.15%, Si: 0.20-0.30%, Mn: 1.40-1.70%, Ni: 0.12-0.15%, Cr : 0.16-0.25%, Mo: 0.08-0.12%, Nb: 0.020-0.030%, Ti: 0.012-0.018%, V ⁇ 0.02%, P ⁇ 0.015%, S ⁇ 0.002%, B:0.0020-0.0030%, and The balance of Fe and inevitable impurities.
  • the total content of Nb+V+Mo is less than or equal to 0.17%.
  • the high-strength and low-temperature toughness marine steel of the invention has a multi-stage heat treatment process for the steel.
  • the heat treatment process adopts normal quenching or sub-temperature quenching; the normal quenching temperature is 880-930 ° C, and the normal quenching holding time is 20-60min, then water cooled to room temperature, tempering the billet cooled to room temperature, tempering temperature is 600-670 ° C, tempering holding time is 30-90min; sub-temperature quenching temperature is 790-850 ° C, Asia The temperature is quenched and kept for 20-60 minutes, then cooled to room temperature, and the steel slab which has been quenched and cooled to room temperature is tempered, the tempering temperature is 440-635 ° C, and the tempering holding time is 30-90 min.
  • the invention is based on the following ideas to prepare high-strength and low-temperature toughness marine steel: precious alloy elements such as 1Mo, Nb and V can play the role of fine grain strengthening and precipitation strengthening.
  • precious alloy elements such as 1Mo, Nb and V can play the role of fine grain strengthening and precipitation strengthening.
  • an excessive amount of alloying elements not only increases the alloy cost, but also adversely affects the properties of the steel (for example, Mo deteriorates the low temperature toughness of the steel).
  • the total content of Nb+V+Mo is reduced to less than 0.17% (the total content of Nb+V+Mo in E500 and E550 marine steel is usually higher than 0.25%), by increasing Mn, B, etc.
  • the low-cost metal content under the premise of ensuring the same strength, improves the low temperature toughness and hardenability of the steel, and effectively reduces the alloy cost.
  • the normal quenching heat treatment process of the present invention is completely austenitizing, that is, the quenching heating temperature is higher than the A c3 point (generally 880-960 ° C), and then tempered at a higher temperature (generally 600-670 ° C), The energy consumption is severe, the performance of the obtained product can only meet the requirements of specific steel grades, and the process adaptability is narrow; while the quenching temperature of the sub-temperature quenching process is low (generally 720-850 ° C), the tempering temperature is low (400-640 ° C), the process window Wide and low energy consumption.
  • the sub-temperature quenching process of the invention is quenched in the ⁇ + ⁇ two-phase region, which not only utilizes the characteristics of ferrite high plastic toughness, but also utilizes the characteristics of high hard tempering structure of martensite decomposition transformation to achieve strong toughness. The best fit. And with the quenching temperature change, the content of the two phases is also constantly changing, and the resulting strength change satisfies the requirements of different strength grades of E460 to E550. On the basis of not changing the composition of the steel, a multi-stage flexible production of one steel is realized. Solve the problem that different alloy grades and different thicknesses of marine steel need different alloy composition schemes, high alloy cost and complicated production process.
  • the content of precious metals such as Mo, Nb, and V is reduced, and the decrease in strength and hardenability is compensated by adding inexpensive elements such as Mn and B.
  • the composition scheme can meet the requirements of E460-E550 for different grades and different thicknesses of marine steel, and solves the problem of complicated production of the structure and high alloy cost.
  • sub-temperature quenching + low temperature tempering process to achieve the best combination of toughness, can replace the quenching and tempering treatment, but also ensure that the high-strength steel has excellent low temperature toughness and elongation, and reduce energy consumption, shortened Production cycle.
  • the invention solves the problems that different steel grades and different plate thicknesses require different compositions and difficult tissue production, and realizes flexible manufacturing of one steel multi-stage; the sub-temperature quenching and the lower temperature tempering process can shorten the production cycle, reduce energy consumption and production. cost.
  • Fig. 1 is a metal phase diagram after heat treatment in Example 2 of the present invention.
  • Figure 2 is a metallographic diagram after heat treatment in Example 4 of the present invention.
  • Figure 3 is a metallographic diagram after heat treatment in Example 10 of the present invention.
  • the thickness of the steel plate of this embodiment is 42 mm, and its chemical composition is C 0.13% by mass, Si 0.20%, Mn 1.45%, Ni 0.12%, Cr 0.16%, Mo 0.08%, Nb 0.023%, Ti 0.014%, V ⁇ 0.02. %, P ⁇ 0.015%, S ⁇ 0.0022%, B 0.002% and the balance of Fe.
  • the slab is produced according to the above-mentioned components, and the slab is heated to 1050-1150 ° C, controlled to be rolled to a predetermined thickness, air-cooled to room temperature after rolling, and then heat-treated. Samples were taken on finished marine steel sheets and then subjected to tensile and low temperature impact tests.
  • the heat treatment process of the test steel is as follows:
  • Sub-temperature quenching The test steel was heated to 820 ° C, kept for 50 min, and then cooled to room temperature with water.
  • the yield strength of the test steel is 505 MPa
  • the tensile strength is 605 MPa
  • the elongation is 22.20%
  • the impact absorption at -40 °C is 216/240/250 J, which can meet the E460 strength grade requirement.
  • the thickness of the steel sheet of this example was 27 mm, and its chemical composition was the same as in Example 1.
  • the heat treatment process of the test steel is as follows:
  • Sub-temperature quenching The test steel was heated to 790 ° C, held for 35 min, and then water-cooled to room temperature.
  • the tempered structure is as shown in Fig. 1, which is ferrite + tempered sorbite, and the volume fraction of ferrite is 32%.
  • the yield strength of the test steel is 521 MPa
  • the tensile strength is 615 MPa
  • the elongation is 22.60%
  • the impact absorption at -40 °C is 218/216/215 J, which can meet the E460 strength grade requirement.
  • the thickness of the steel plate of this embodiment is 50 mm, and the chemical composition thereof is C 0.12% by mass, Si 0.24%, Mn 1.56%, Ni 0.14%, Cr 0.23%, Mo 0.09%, Nb 0.025%, Ti 0.012%, V ⁇ 0.02. %, P ⁇ 0.015%, S ⁇ 0.002%, B 0.0027% and the balance of Fe.
  • the slab is produced according to the above-mentioned components, and the slab is heated to 1050-1150 ° C, controlled to be rolled to a predetermined thickness, air-cooled to room temperature after rolling, and then heat-treated. Samples were taken on finished marine steel sheets and then subjected to tensile and low temperature impact tests.
  • the heat treatment process of the test steel is as follows:
  • Sub-temperature quenching The test steel was heated to 790 ° C, kept for 60 min, and then cooled to room temperature with water.
  • the yield strength of the test steel is 580 MPa
  • the tensile strength is 662 MPa
  • the elongation is 21.28%
  • the impact absorption work at -40 °C is 202/204/211 J, which can meet the E500 strength grade requirement.
  • the thickness of the steel plate of this embodiment is 30 mm, and the chemical composition thereof is C 0.12% by mass, Si 0.26%, Mn 1.57%, Ni 0.12%, Cr 0.20%, Mo 0.12%, Nb 0.027%, Ti 0.008%, V ⁇ 0.02. %, P ⁇ 0.015%, S ⁇ 0.002%, B 0.0024% and the balance of Fe.
  • the slab is produced according to the above-mentioned components, and the slab is heated to 1050-1150 ° C, controlled to be rolled to a predetermined thickness, air-cooled to room temperature after rolling, and then heat-treated. Samples were taken on finished marine steel sheets and then subjected to tensile and low temperature impact tests.
  • the heat treatment process of the test steel is as follows:
  • Sub-temperature quenching The test steel was heated to 850 ° C, kept for 40 min, and then cooled to room temperature with water.
  • the tempered structure is as shown in Fig. 2, which is ferrite + tempered sorbite, and the ferrite volume fraction is 11.5%.
  • the yield strength of the test steel is 587 MPa
  • the tensile strength is 659 MPa
  • the elongation is 19.84%
  • the impact absorption at -40 °C is 224/239/228 J, which can meet the E500 strength grade requirements.
  • the thickness of the steel plate of this embodiment is 46 mm, and the chemical composition thereof is C 0.13% by mass, Si 0.30%, Mn 1.60%, Ni 0.15%, Cr 0.22%, Mo 0.10%, Nb 0.020%, Ti 0.018%, V ⁇ 0.02. %, P ⁇ 0.015%, S ⁇ 0.002%, B 0.0026% and the balance of Fe.
  • the slab is produced according to the above-mentioned components, and the slab is heated to 1050-1150 ° C, controlled to be rolled to a predetermined thickness, air-cooled to room temperature after rolling, and then heat-treated. Samples were taken on finished marine steel sheets and then subjected to tensile and low temperature impact tests.
  • the heat treatment process of the test steel is as follows:
  • Sub-temperature quenching The test steel was heated to 790 ° C, kept for 60 min, and then cooled to room temperature with water.
  • the yield strength of the test steel is 606 MPa
  • the tensile strength is 750 MPa
  • the elongation is 17.88%
  • the impact absorption at -40 °C is 166/162/171 J, which can meet the E550 strength grade requirement.
  • the thickness of the steel sheet of this example was 18 mm, and its chemical composition was the same as that of Example 5.
  • the heat treatment process of the test steel is as follows:
  • Sub-temperature quenching The test steel was heated to 820 ° C, kept for 27 min, and then water-cooled to room temperature.
  • the yield strength of the test steel is 635 MPa
  • the tensile strength is 739 MPa
  • the elongation is 19.84%
  • the impact absorption at -40 °C is 195/114/183 J, which can meet the E550 strength grade requirement.
  • the thickness of the steel plate of this embodiment is 16 mm, and the chemical composition thereof is C 0.15% by mass, Si 0.25%, Mn 1.70%, Ni 0.13%, Cr 0.18%, Mo 0.10%, Nb 0.026%, Ti 0.017%, V ⁇ 0.02. %, P ⁇ 0.015%, S ⁇ 0.002%, B 0.0025% and the balance of Fe.
  • the slab is produced according to the above-mentioned components, and the slab is heated to 1050-1150 ° C, controlled to be rolled to a predetermined thickness, air-cooled to room temperature after rolling, and then heat-treated. Samples were taken on finished marine steel sheets and then subjected to tensile and low temperature impact tests.
  • the heat treatment process of the test steel is as follows:
  • Sub-temperature quenching The test steel was heated to 850 ° C, kept for 25 min, and then cooled to room temperature with water.
  • the yield strength of the test steel is 734 MPa
  • the tensile strength is 789 MPa
  • the elongation is 17.04%
  • the impact absorption work at -40 °C is 191/203/193 J, which can meet the E550 strength grade requirement.
  • the thickness of the steel plate of this embodiment is 38 mm, and the chemical composition thereof is C 0.12% by mass, Si 0.27%, Mn 1.40%, Ni 0.14%, Cr 0.20%, Mo 0.11%, Nb 0.030%, Ti 0.018%, V ⁇ 0.02. %, P ⁇ 0.015%, S ⁇ 0.002%, B 0.0028% and the balance of Fe.
  • the slab is produced according to the above-mentioned components, and the slab is heated to 1050-1150 ° C, controlled to be rolled to a predetermined thickness, air-cooled to room temperature after rolling, and then heat-treated. Samples were taken on finished marine steel sheets and then subjected to tensile and low temperature impact tests.
  • the heat treatment process of the test steel is as follows:
  • test steel was heated to 880 ° C, kept for 40 min, and then water cooled to room temperature.
  • the yield strength of the test steel is 655 MPa
  • the tensile strength is 696 MPa
  • the elongation is 20.48%
  • the impact absorption at -40 °C is 226/248/230 J, which can meet the E550 strength grade requirement.
  • the thickness of the steel plate of this embodiment is 22 mm, and the chemical composition thereof is C 0.14% by mass, Si 0.25%, Mn 1.50%, Ni 0.10%, Cr 0.25%, Mo 0.09%, Nb 0.024%, Ti 0.014%, V ⁇ 0.02. %, P ⁇ 0.015%, S ⁇ 0.002%, B 0.0030% and the balance of Fe.
  • the slab is produced according to the above-mentioned components, and the slab is heated to 1050-1150 ° C, controlled to be rolled to a predetermined thickness, air-cooled to room temperature after rolling, and then heat-treated. Samples were taken on finished marine steel sheets and then subjected to tensile and low temperature impact tests.
  • the heat treatment process of the test steel is as follows:
  • test steel was heated to 900 ° C, kept for 30 min, and then water cooled to room temperature.
  • the yield strength of the test steel is 740 MPa
  • the tensile strength is 778 MPa
  • the elongation is 18.76%
  • the impact absorption at -40 °C is 215/215/210 J, which can meet the E550 strength grade requirement.
  • the thickness of the steel plate of this embodiment is 10 mm, and the chemical composition thereof is C 0.15% by mass, Si 0.28%, Mn 1.65%, Ni 0.15%, Cr 0.18%, Mo 0.10%, Nb 0.030%, Ti 0.012%, V ⁇ 0.02. %, P ⁇ 0.015%, S ⁇ 0.002%, B 0.0028% and the balance of Fe.
  • the slab is produced according to the above-mentioned components, and the slab is heated to 1050-1150 ° C, controlled to be rolled to a predetermined thickness, air-cooled to room temperature after rolling, and then heat-treated. Samples were taken on finished marine steel sheets and then subjected to tensile and low temperature impact tests.
  • the heat treatment process of the test steel is as follows:
  • test steel was heated to 930 ° C, kept for 20 min, and then water cooled to room temperature.
  • the tempered structure is as shown in Fig. 3, which is tempered sorbite, without pro-eutectoid ferrite.
  • the yield strength of the test steel is 772 MPa
  • the tensile strength is 816 MPa
  • the elongation is 17.32%
  • the impact absorption at -40 °C is 188/220/192 J, which can meet the E550 strength grade requirement.

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PCT/CN2018/088338 2017-10-24 2018-05-25 一种高强度优良低温韧性船用钢及其一钢多级热处理工艺 WO2019080492A1 (zh)

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CN114959511A (zh) * 2022-05-13 2022-08-30 河北普阳钢铁有限公司 一种700MPa级高韧性防爆钢板的制造方法
CN115838904A (zh) * 2022-12-20 2023-03-24 衡阳华菱钢管有限公司 850MPa级高强度高韧性无缝钢管的制造方法
CN116179956B (zh) * 2023-03-13 2024-06-25 宝武集团鄂城钢铁有限公司 基于同成分实现420～890MPa不同强度级别特厚船板钢及其生产方法
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