CN112941420B - High-strength impact-resistant heat-resistant low-temperature-resistant alloy steel and manufacturing process thereof - Google Patents
High-strength impact-resistant heat-resistant low-temperature-resistant alloy steel and manufacturing process thereof Download PDFInfo
- Publication number
- CN112941420B CN112941420B CN201911175009.5A CN201911175009A CN112941420B CN 112941420 B CN112941420 B CN 112941420B CN 201911175009 A CN201911175009 A CN 201911175009A CN 112941420 B CN112941420 B CN 112941420B
- Authority
- CN
- China
- Prior art keywords
- temperature
- resistant
- blank
- strength
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- 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
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/04—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
- C22C38/22—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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses high-strength impact-resistant heat-resistant low-temperature-resistant alloy steel and a manufacturing process thereof. It has good castability, heat treatability, workability and weldability. The hollow crankshaft is widely used for manufacturing hollow crankshafts with complex shapes in petrochemical oil production equipment, hollow shafts in tubular mills in mines and metallurgical equipment and important parts of gears, discs or rings which are cast instead of forged, wherein the hollow crankshafts have high strength, impact resistance, wear resistance, low temperature resistance and corrosion resistance and need to be used for manufacturing gears, discs or rings, and the hollow crankshafts have complex shapes in petrochemical oil production equipment and are subjected to cold and hot working at the temperature of below 500 ℃ or between 500 ℃ and-50 ℃. The main properties of the steel of the invention are as follows: yield strength of BBs ═ (756-813) N/mm 2 The impact toughness alpha ku is (61-69) J/cm 2 At-50 deg.C,. alpha.ku ═ 45-53J/cm 2 (ii) a Compared with the existing ZG35SiMn product with more applications, the yield strength is improved by 86.8%, the toughness is improved by 85.7%, the product performance of the product of the Bide country company is improved by 12.07%, the alpha ku is improved by 47.73%, and if the product price is reduced by 45% (namely 6.6 ten thousand yuan/T) according to the import product price (12 ten thousand yuan/T), the product export 15000T can earn about 1.5 hundred million dollars each year.
Description
Technical Field
The invention relates to a low-alloy cast steel with high strength, impact resistance, heat resistance and low temperature resistance, which can be widely used for manufacturing large and small gears, gear rings, heavy-load traveling crane and tower crane rollers, riding wheels, wheel belts and heavy-load gear rings in large rotary kilns in industrial equipment such as petrifaction, mines, metallurgy, ships, transportation, electric power, building materials, machinery and the like; an end disc, a hammer disc, a speed reducer gear and a large flywheel in the hammer crusher; hollow shafts in various tubular mills and large gear rings in edge transmission; vital sprockets in various types of conveyors; important parts at the high end such as a hollow crankshaft of petrochemical equipment, a gear, a large cutter head … … of a shield machine and the like; the invention also relates to a manufacturing process of the low alloy steel with high strength, impact resistance, heat resistance and low temperature resistance.
Technical Field
In the prior art, alloy cast steel blanks of all countries all over the world generally exist to different degrees: casting defects such as air holes, sand inclusion or slag inclusion, shrinkage cavities, segregation or cracks and the like; the main performance problems of at least 95% of the world with alloy cast steel products are: the yield strength (bps) is low, the impact toughness (alpha ku) is poor, the low-temperature resistance toughness is worse or is not involved in research, and the importance of the low-temperature resistance toughness is not known at all; however, with the development of industrial equipment in various countries in the world, the demand for improving various performances of oceans, petrochemicals and national defense, and the research and experiment on low-temperature toughness, heat resistance, wear resistance, corrosion resistance and weldability of various alloy steels (including forged steel or cast steel) in Germany, Sweden, Japan and other countries with the development of material science, great manpower and financial resources are invested and obvious effects are obtained.
Generally speaking, the design level, the production technical level and the application technical analysis level of low-alloy cast steel in China are quite lagged behind; the Q/ZB66-73 and JB/T5000.6-2007 standards of the Chinese alloy cast steel are read through, and the 21 listed alloy cast steels are found to have generally low performance and serious insufficient impact toughness, and the low-temperature toughness is no … … at all, so that the search, development and research of novel high-strength, impact-resistant and low-temperature-resistant multifunctional special alloy cast steel to meet the requirements of industrial construction and the improvement of the performances of marine, petrochemical and national defense equipment is urgent!
Disclosure of Invention
The invention aims to provide a low-alloy cast steel with high strength, impact resistance, heat resistance and low temperature resistance, which has the characteristics of no casting defects such as air holes, no cracks, no sand inclusion and the like, high strength, impact resistance, heat resistance, low temperature resistance and corrosion resistance, has low manufacturing and using cost, and fully meets the requirements of wide use of various modern large-scale industrial mechanical equipment and important parts.
Another object of the present invention is to provide a process for producing a low-alloy cast steel having high strength, impact resistance, heat resistance and low temperature resistance.
In order to achieve the purpose, 11 tons of molten steel is smelted by adopting a 5 ton electric arc furnace, and the forging product (serial number 2016-10-7) has the following main properties: BBs ═ (1105-1155) N/mm 2 ，Бb＝(1180-1270)N/mm 2 ，δ≥14％，αku＝(101.25-113.75)J/cm 2 ，αku(-50℃)＝(89-98)J/cm 2 (ii) a Corresponding castingThe steel is used for performance detection, and the main performance data is as follows: BBs ═ (756 once 813) N/mm 2 ，Бb＝(826-895)N/mm 2 ，αku＝(61-69)J/cm 2 At-50,. alpha.ku ═ 45-53J/cm 2 ，
The invention selects C, Si, Mn, Cr and Mo as main additive elements. A small amount of V, Nb, N, Zr, Ti and RE elements are added; it is a multifunctional special steel with low alloy and inherent property, so that it possesses good castability, repair welding property, heat treatment and working property and corrosion resistance.
The technical key is that the castability defect of the blank is avoided or reduced, the qualified rate of the blank is improved, and the manufacturing cost is reduced. The cast steel blank is annealed, roughly processed, quenched and tempered, and the microstructure of the cast steel blank is uniform and fine high-strength and high-toughness sorbite in which dotted carbides and nitrides are dispersed. It has high strength, hardness and wear resistance, and has good impact toughness, corrosion resistance and heat resistance, and the comprehensive mechanical performance of the cast steel product is far superior to that of many existing forged steel products, so that the cast steel product can be objectively and completely 'cast instead of forged'; so far, no material which is more suitable for manufacturing various large-scale important mechanical equipment and parts than the material is found at home and abroad. The cast steel comprises the following components in percentage by mass:
carbon (C): 0.26-0.42; silicon (Si): 0.40-0.75; manganese (Mn): 0.65-1.25; chromium (Cr): 0.9-1.4; molybdenum (Mo): 0.5-0.85; vanadium (V): 0.30-0.65; niobium (Nb): 0.2-0.42; nitrogen (N) is less than or equal to 0.15; titanium (Ti) is less than or equal to 0.18;
zirconium (Zr) is less than or equal to 0.18; rare earth element (RE) is less than or equal to 0.18; phosphorus (P) is less than or equal to 0.02; sulfur (S) is less than or equal to 0.02; iron (Fe): 96.06-93.53;
and the chemical composition technical characteristics that at least one of the four elements of nitrogen (N), titanium (Ti), zirconium (Zr) and rare earth element (RE) in the components is not zero, and the balance is Fe.
In the present invention, a part of carbon (C) is dissolved in α -Fe to form a ferrite solid solution and Fe forms cementite (Fe) 3 C) C also forms alloy carbide with excessive alloy elements dissolved in ferrite, wherein the alloy carbide has high hardness and is heat-resistant and wear-resistant: VC, NbC, TiC, ZrC and Mo 2 C、Mn 7 C 3 、Cr 7 C 3 (ii) a While carbon is dissolved in cementite (Fe) 3 C) The alloy elements jointly form an alloy cementite with complex crystal lattices: (Fe. Cr) 3 C、(Fe·Mn) 3 C、(Fe·Mo) 3 C、(Fe·Cr) 23 C 6 、(Fe·Mo) 23 C 6 、(Fe·V) 3 C、(Fe·V) 23 C 6 Etc.; these homogeneously dispersed carbides, on the one hand, strongly impede the growth of the high-temperature austenite grains, thus increasing the temperature point for complete austenitization, in order to minimize the sorbite grains obtained after the heat treatment: grain size of 20-um 2 It has enough strength, hardness and good impact toughness, and its carbon content is controlled between 0.26% and 0.42% in the invention.
Silicon (Si) is usually added as a deoxidizer, and when the content is less than or equal to 0.85 percent, the Si is completely dissolved in ferrite, so that the strength and the hardness of the ferrite are enhanced strongly, and the toughness change is very small; when the content is more than 0.85%, the toughness is remarkably reduced; however, Si not only improves the tempering stability, but also increases the fluidity of molten steel and improves the casting performance. Therefore, the content of Si in the present invention is controlled between 0.4% and 0.75%.
Manganese (Mn) is soluble in ferrite to form an alloy ferrite alpha-Fe (Mn) and to form an alloy carbide Mn 7 C 3 And alloy cementite (Fe. Mn) 3 C is an important element for improving hardenability, homogenizing tissues and improving strength, hardness and toughness; in addition, Mn can form MnS with impurities S to be removed by slag, so Mn has the functions of purifying molten steel and removing impurities automatically. Meanwhile, Mn is also a good deoxidizer, reduces the brittleness of steel and improves the quality of the steel. When Mn is contained in<At 0.9%, the strength and hardness of the steel increase with the increase of the content thereof, and the impact toughness varies slightly within this range; but when Mn content is high>At 1.5%, the impact toughness decreases sharply. In order to achieve the strengthening effect and not to reduce the toughness greatly, the Mn content is controlled between 0.65% and 1.25%.
Chromium (Cr) and molybdenum (Mo) are partially dissolved in ferrite to form alloy ferrite alpha-Fe (Cr), alpha-Fe (Mo); another part forming a fine-grained, dispersed stable alloyCarbide; cr (chromium) component 7 C 3 、Mo 2 C; and a part dissolved in cementite (Fe) 3 C) In addition, the alloy cementite is also stabilized in a fine, dispersed and diffused way: (Fe. Cr) 3 C、(Fe·Mo) 3 C、(Fe·Cr) 23 C 6 The equal state exists in the grain boundary and among the grain boundaries of the high-temperature austenite, which not only prevents the growth of austenite grains, but also lays a good foundation for obtaining uniform fine grain sorbite tissues after quenching and tempering, thereby obviously improving the strength, hardness, wear resistance and high-temperature oxidation resistance of the high-temperature austenite; meanwhile, the reasonable combination of Cr and Mo also has the function of shifting the C curve to the right to obviously improve the hardenability, and improves the tempering stability, strength, hardness and wear resistance; the addition of Mo, Ti, Zr and RE effectively reduces the temper brittleness; when the content of Cr element is less than or equal to 1%, the strength, hardness and impact toughness of the steel sheet are increased with the increase of Cr content, but when the content is 1%<When Cr is less than or equal to 2%, the impact toughness of steel is slightly reduced, and when Cr is contained, the impact toughness is slightly reduced>When the Cr content is 2%, the strength and the impact toughness are obviously reduced, so that the Cr content is controlled to be 0.9-1.4% in the invention;
when the Mo content is less than or equal to 5%, the strength and hardness of the steel increase with the Mo content, but the toughness of the steel increases from 245J/cm with the Mo content 2 Sharply decreases to 63.7J/cm 2 Especially when the steel contains Mo>When the content is 1.7%, the toughness is remarkably reduced; in addition, the addition of Mo, Ti and Nb effectively improves the tempering stability and greatly improves the strength of the steel after tempering; therefore, the Mo content should be controlled between 0.5% -0.85% in the present invention.
Vanadium (V) and niobium (Nb), V, Nb exist in austenite alloy steel in the form of dispersed fine Vanadium Carbide (VC) and niobium carbide (NbC) in and between austenite grain boundaries, and strongly hinder the growth of austenite grains; v, Nb the trace addition is helpful to greatly improve the high temperature strength and the tempering stability of the finished product and increase the impact toughness and the low temperature resistance toughness. In order to comprehensively consider all element composition ratios and required strength, toughness and low temperature resistance, the invention confirms that the content of V is as follows: 0.30% -0.65%; the content of Nb is: 0.2 to 0.42 percent.
Zirconium (Zr), titanium (Ti), Zr, Ti and C exist in grain boundary of high-temperature austenite and among grain boundary in dispersed and fine zirconium carbide (ZrC) and titanium carbide (TiC), so that the growth of the grain is effectively prevented, and the hardenability, tempering stability, weldability of the finished product and high-temperature strength are enhanced. In order to obtain a fine-grained high-strength tempered sorbite having high heat resistance and impact toughness, the present invention confirms that the Zr content is less than or equal to 0.18% and the Ti content is less than or equal to 0.18%.
The dissolving amount of nitrogen (N) and N in alpha-Fe and gamma-Fe reaches 0.1 percent and 2.8 percent respectively, and the nitrogen (N) and the N in high-temperature austenite partially compete for part of alloy elements: such as: v, Nb, Zr, Ti, Mo, etc. form heat-resistant and hardly decomposed nitrides: VN, NbN, Nb 2 N、ZrN、TiN、Cr 2 N and the like are dispersed in and among the crystal boundaries of austenite in a fine particle mode, and the growth of austenite crystal grains is strongly prevented; the high-temperature resistant strength of the finished product and the hardness and the wear resistance of the finally obtained tissue sorbite are greatly improved. The addition of N reduces the content of C elements which are unfavorable for welding; n enables the Ms temperature point to move downwards, so that the hardenability and strength of the austenitic alloy steel are improved; thereby the obtained austenite has good toughness, low temperature resistance and weldability. However, excessive N causes pores in the cast slab, so that the N content in the invention is determined as follows: less than or equal to 0.18 percent.
The addition of rare earth element (RE) in small amount can raise toughness and weldability, and has the functions of desulfurizing S, degassing and eliminating harmful impurity. In the present invention, it was confirmed that: the RE content is less than or equal to 0.18 percent.
Phosphorus (P), sulfur (S), P, S present many of the same hazards in austenitic steels: c, Mn elements are promoted to generate segregation, S exists in the form of FeS and MnS in the austenitic alloy steel, and enters slag in the form of MnS; but FeS and Fe can exist eutectic with low melting point and are distributed on grain boundaries, so that the bonding force between the grain boundaries is weakened, and the steel is easy to crack and damage when being stressed in a hot state; in addition, since P tends to promote the growth of austenite grains, P, S content in the present invention is considered to be: less than or equal to 0.02 percent.
The corrosion resistance of the invention is quite obvious, such as: the addition of Cr, Ti and Nb has good capability of resisting atmosphere and seawater corrosion; the addition of V, Ti and Nb has obvious intergranular corrosion resistance; and the addition of Cr, Nb, V, Ti, Si and RE makes the alloy steel have … … very obvious high temperature oxidation resistance.
The low-alloy cast steel with high strength, impact resistance, heat resistance and low temperature resistance is smelted by adopting an electric arc furnace; slagging by using lime powder and fluoride powder in a ratio of 2: 1; the steelmaking raw materials are scrap steel and ferroalloy; the charging sequence is as follows: scrap steel, ferrochromium; adding ferromanganese and ferromolybdenum after melting and deslagging; adding Si in the reduction period, and carrying out primary deoxidation by using Mn and Si; adding ferrovanadium, ferroniobium and FeN (chromium nitride) after deslagging, sequentially adding Zr and Ti and then adding Rare Earth (RE) at an interval of 5-10 minutes after deslagging again; adding 1KG amphoteric oxide aluminum (A1) into each ton of molten steel before casting for final deoxidation treatment, wherein the tapping temperature is as follows: 1620-1580 deg.c, and casting at 1570-1480 deg.c. The specific production process comprises the following steps:
1. casting of a blank: the tapping temperature is 1620-1580 ℃, the casting temperature is 1570-1480 ℃, the casting is unpacked at 250-300 ℃, and the temperature of a cutting casting head is not less than 230 ℃;
2. annealing treatment: heating the cleaned and finished blank in a furnace to 650-720 ℃, preserving heat for 8-12 hours, cooling the blank in the furnace to be less than or equal to 350 ℃, discharging the blank out of the furnace, and air cooling the blank;
3. and (3) machining:
(1) scribing and rough machining: hanging the annealed blank on a platform, aligning the annealed blank according to the center line of the workpiece vertical to the platform, and marking out according to the condition that 2.5mm-3.0mm is left on one side; aligning and clamping the scribed blank according to a line, and then performing rough machining, wherein the outline is subjected to 100% over-detection;
(2) quenching, tempering and finishing: heating the semi-finished product which is qualified by the super-detection to 880-960 ℃ integrally in a furnace, preserving heat for 3-5 hours, and then cooling uniformly; then the temperature is raised to 530-700 ℃, the temperature is kept for 2-4 hours and the mixture is cooled, and then the mixture is processed and formed according to the size of the drawing.
Compared with the Germany with developed materials in the world, the high-strength low-alloy cast steel with the characteristics of impact resistance, heat resistance and low temperature resistance has the advantages that the yield strength (bps) is improved by 12.07 percent, and the impact toughness (alpha ku) is improved by 47.73 percent; and to russia: the yield Strength (BBs) is improved by 33.42%, and the impact toughness is improved by 10.17%; compared with the traditional ZG35SiMn, the yield strength (bams) is improved by 86.8 percent, the impact toughness is improved by 85.7 percent, and the strength is improved by 20.7 percent. The method fundamentally, comprehensively and thoroughly solves the economic and technical problems of easy fracture, low strength, no wear resistance, short service life, frequent replacement, high manufacturing or using cost of various alloy cast iron or cast steel materials and most forged steel quenched and tempered products which exist for a long time under the conditions of heavy load and strong wear or impact in the industries of petrifaction, mine, metallurgy, building materials, electric power, machinery, ordnance and the like in which the working temperature is lower than or equal to (+500 ℃) or the working temperature is lower than or equal to minus 50 ℃) and the heat is lower than or equal to 500 ℃ at the same time.
Therefore, the steel has wide practical value and popularization value, thereby obtaining remarkable enterprise benefit and huge social and comprehensive economic benefit.
Detailed Description
The steel of the invention was now used in four specific examples to produce a cast steel end disc (net weight: 985 kg/piece) product in a large hammer crusher [ main dimensions: corresponding detection size data (mm) and process execution temperatures of Φ 1650 (outer diameter) × 55 (thickness) × 6 of circular bosses with edge planes [ [ Φ 280 (outer diameter) × Φ 143 (aperture) × 32 (height) ] × Φ 650 (middle circular truncated cone) × 420 × 420 (square hole) ] are respectively listed as follows:
the four-furnace steel furnace comprises the following chemical components:
the process temperature and the detection performance of the four-furnace cast steel production process [ unit: degree centigrade (T deg.C) ]
The specific implementation process is as follows: according to the steel components of the invention, four furnaces (2/furnace) are smelted by adopting 2 tons of electric arc furnaces (3.5 tons of molten steel/furnace), and the tapping temperatures are respectively as follows: 1590 deg.C, 1610 deg.C, 1580 deg.C, 1620 deg.C; the casting temperature corresponds to: 1560 deg.C, 1570 deg.C, 1500 deg.C, 1480 deg.C; the opening temperature of the end plate cast steel blank is correspondingly as follows: cutting a casting head at 250 ℃, 300 ℃, 280 ℃ and 270 ℃ with the temperature T ℃ being more than or equal to 220 ℃ and grinding; each furnace cast steel blank is respectively as follows: 680 ℃, 650 ℃, 690 ℃ and 720 ℃, and the heat preservation time is as follows: t is 8 hours, and the steel is taken out of the furnace and cooled in air after being cooled to 200 ℃; and then, carrying out numerical control rough turning according to the size of the graph and the single side of 3 mm. The heating temperature of the rear special furnaces is correspondingly as follows: 880 deg.C, 900 deg.C, 930 deg.C, 960 deg.C; corresponding heat preservation time: cooling uniformly after 4 hours; tempering at 550 ℃, 630 ℃, 680 ℃ and 700 ℃ respectively, and keeping the temperature for: all cool 2.5 hours later, carried out performance detection and metallographic analysis to the same stove test piece one by one simultaneously, the detection unit mainly has: the Wuhan metal material test detection center of the general company of the Zhonghai, the Wuhan iron and steel design research institute, and the like; the using effect of the product is satisfied by each user.
Claims (1)
1. The high-strength impact-resistant heat-resistant low-temperature-resistant alloy steel is characterized by comprising the following chemical components in percentage by weight: c: 0.37; si: 0.75; mn: 1.25; cr: 0.9; mo: 0.5; v: 0.32 of; nb: 0.2; ti: 0.07; zr: 0.09; p: 0.015; s: 0.015; the balance of Fe;
the preparation method of the high-strength impact-resistant heat-resistant low-temperature-resistant alloy steel comprises the following steps:
(1) casting of a blank: the tapping temperature is 1620-1580 ℃, the casting temperature is 1570-1480 ℃, the casting is unpacked at 250-300 ℃ for sand removal, and the casting temperature of a cutting casting head is not less than 230 ℃;
(2) annealing treatment: heating the cleaned and integrated blank in a furnace to 650-720 ℃, preserving heat for 8-12 hours, cooling the blank in the furnace to be less than or equal to 350 ℃, taking the blank out of the furnace, and air cooling the blank;
(3) and (3) machining:
scribing and rough machining: hanging the annealed blank on a platform, aligning the annealed blank perpendicular to the platform according to the center line of the workpiece, and marking by keeping 2.5-3 mm of the single side of the machined surface as required; aligning and flattening the blank which is already subjected to line drawing according to the line, and then performing rough machining;
and secondly, quenching, tempering and finishing: heating the semi-finished product qualified by the super detection in a furnace to 880-960 ℃, preserving heat for 3-5 hours, then uniformly cooling, reheating the semi-finished product to 530-700 ℃, and preserving heat for 2-4 hours for uniform cooling; and hoisting the qualified semi-finished product after hardening and tempering to finish machining equipment, aligning, clamping, and performing finish machining and forming according to the requirements of a drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911175009.5A CN112941420B (en) | 2019-11-26 | 2019-11-26 | High-strength impact-resistant heat-resistant low-temperature-resistant alloy steel and manufacturing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911175009.5A CN112941420B (en) | 2019-11-26 | 2019-11-26 | High-strength impact-resistant heat-resistant low-temperature-resistant alloy steel and manufacturing process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112941420A CN112941420A (en) | 2021-06-11 |
| CN112941420B true CN112941420B (en) | 2022-09-13 |
Family
ID=76225221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911175009.5A Active CN112941420B (en) | 2019-11-26 | 2019-11-26 | High-strength impact-resistant heat-resistant low-temperature-resistant alloy steel and manufacturing process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112941420B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116536570B (en) * | 2023-05-21 | 2024-04-12 | 襄阳金耐特机械股份有限公司 | G26CrMo4 cast steel without casting crack and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000026937A (en) * | 1998-07-09 | 2000-01-25 | Kawasaki Steel Corp | High strength pc steel bar and its production |
| CN1740367A (en) * | 2005-09-14 | 2006-03-01 | 刘承刚 | High strength heat resistant antiwear vertical mill sheath and its making process |
| CN102312159A (en) * | 2010-07-06 | 2012-01-11 | 泰州汇能不锈钢制品有限公司 | Heat treatment process of martensite wear-resistant cast steel |
| CN103266276A (en) * | 2013-02-03 | 2013-08-28 | 王康 | Method for preparing low alloy high wear resistant cast steel plate |
| CN107177797A (en) * | 2017-04-24 | 2017-09-19 | 江阴兴澄特种钢铁有限公司 | The oil gas field anti-corrosion drilling tool steel of 130KSI, 135KSI rank and its manufacture method |
| CN110129675A (en) * | 2019-05-23 | 2019-08-16 | 江苏省沙钢钢铁研究院有限公司 | High tensile reinforcement and its production method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61143523A (en) * | 1984-12-17 | 1986-07-01 | Toshiba Corp | Manufacture of rotor for geothermal energy turbine |
-
2019
- 2019-11-26 CN CN201911175009.5A patent/CN112941420B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000026937A (en) * | 1998-07-09 | 2000-01-25 | Kawasaki Steel Corp | High strength pc steel bar and its production |
| CN1740367A (en) * | 2005-09-14 | 2006-03-01 | 刘承刚 | High strength heat resistant antiwear vertical mill sheath and its making process |
| CN102312159A (en) * | 2010-07-06 | 2012-01-11 | 泰州汇能不锈钢制品有限公司 | Heat treatment process of martensite wear-resistant cast steel |
| CN103266276A (en) * | 2013-02-03 | 2013-08-28 | 王康 | Method for preparing low alloy high wear resistant cast steel plate |
| CN107177797A (en) * | 2017-04-24 | 2017-09-19 | 江阴兴澄特种钢铁有限公司 | The oil gas field anti-corrosion drilling tool steel of 130KSI, 135KSI rank and its manufacture method |
| CN110129675A (en) * | 2019-05-23 | 2019-08-16 | 江苏省沙钢钢铁研究院有限公司 | High tensile reinforcement and its production method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112941420A (en) | 2021-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102703817B (en) | Free-machining pinion steel and production technique thereof | |
| CN109023119B (en) | Wear-resistant steel with excellent ductility and toughness and manufacturing method thereof | |
| CN109457081B (en) | Rare earth microalloyed bearing steel and preparation method thereof | |
| CN103667953A (en) | Oceanic mooring chain steel with low environmental crack sensitivity and ultrahigh obdurability and preparation method thereof | |
| CN108950432B (en) | Manufacturing method of high-strength and high-toughness low-alloy wear-resistant steel | |
| CN104109816A (en) | Carburizing alloy steel, and preparation method and application thereof | |
| EP4186990A1 (en) | Steel for ball-cage type universal joint retainer and production method therefor | |
| CN111500928B (en) | Low-temperature high-toughness high-temperature high-strength and high-hardenability hot die steel and preparation technology thereof | |
| CN109136779B (en) | Preparation method of 1100 MPa-level rare earth Q & P steel with martensite matrix | |
| CN108486475A (en) | A kind of think gauge wear-resisting steel plate and preparation method thereof with good centre hardness | |
| CN101845597B (en) | Low-cost 80-kilo grade super-thick quenched and tempered steel plate and production method thereof | |
| JP2024515134A (en) | Steel for high temperature carburizing gear shaft and manufacturing method of the steel | |
| AU2022392619A1 (en) | High-strength steel with good weather resistance and manufacturing method therefor | |
| CN114941101B (en) | Steel for bearing shaft of automobile engine and production method thereof | |
| WO2023160613A1 (en) | Mooring chain steel and production method therefor, and mooring chain and production method therefor | |
| US11959158B2 (en) | Hot-work die steel with high toughness at low temperatures and high strength at high temperatures and high hardenability and preparation method thereof | |
| Bhardwaj | Steel and Iron Handbook | |
| CN109234631B (en) | Low-temperature-resistant stainless steel and preparation method thereof | |
| CN112941420B (en) | High-strength impact-resistant heat-resistant low-temperature-resistant alloy steel and manufacturing process thereof | |
| WO2019029533A1 (en) | Cast steel, preparation method for cast steel and use of cast steel | |
| CN107130176A (en) | A kind of novel high speed Steel material and its preparation technology | |
| CN113564470B (en) | 1700MPa heat-resistant steel for agricultural machinery and manufacturing method thereof | |
| CN110241363B (en) | Cast steel material and casting method thereof | |
| CN113462986A (en) | 2000MPa environment-friendly heat-resistant steel for agricultural machinery and manufacturing method thereof | |
| CN112853200B (en) | High-hardness wear-resistant corrosion-resistant high-temperature-resistant alloy cast steel grinding sleeve and manufacturing process thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |