WO2021047277A1 - 非调质钢的制备方法以及利用其制备细晶锻件的方法 - Google Patents

非调质钢的制备方法以及利用其制备细晶锻件的方法 Download PDF

Info

Publication number
WO2021047277A1
WO2021047277A1 PCT/CN2020/101763 CN2020101763W WO2021047277A1 WO 2021047277 A1 WO2021047277 A1 WO 2021047277A1 CN 2020101763 W CN2020101763 W CN 2020101763W WO 2021047277 A1 WO2021047277 A1 WO 2021047277A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
forging
rolling
quenched
tempered steel
Prior art date
Application number
PCT/CN2020/101763
Other languages
English (en)
French (fr)
Inventor
周蕾
刘磊
赵秀明
刘文学
孙华
冯宇阳
Original Assignee
南京钢铁股份有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 南京钢铁股份有限公司 filed Critical 南京钢铁股份有限公司
Priority to KR1020217043399A priority Critical patent/KR20220036918A/ko
Publication of WO2021047277A1 publication Critical patent/WO2021047277A1/zh

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/766—Connecting rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K29/00—Arrangements for heating or cooling during processing
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous 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
    • C22C38/001—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
    • C22C38/02—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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/50—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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/02—Austenitic rolling

Definitions

  • the invention relates to a preparation method of an engine non-quenched and tempered breaking connecting rod, in particular to a preparation method of steel for an engine breaking connecting rod and a fine-grain forging.
  • the connecting rod is one of the main parts in the automobile engine. It is mainly used to connect the piston and the crankshaft of the engine. It must bear a certain alternating load such as compression and tension. Therefore, the engine connecting rod is required to have good mechanical properties. At present, most of the engine connecting rods are made of quenched and tempered steel.
  • the present invention provides a method for preparing a steel for non-quenched and tempered breaking connecting rod of an engine and a fine-grained forging. It can effectively refine the grain size of the connecting rod, improve the strength, toughness and plasticity of the material, effectively improve the comprehensive mechanical properties of the connecting rod, and can eliminate the quenching and tempering treatment and simplify the processing technology.
  • the preparation method of non-quenched and tempered steel of the present invention includes the steps of open rolling, water cooling, finishing rolling, water cooling and final rolling to obtain non-quenched and tempered steel bars of ⁇ 37-40.
  • the rolling heating temperature is 1150-1200°C, among which, the opening rolling temperature is 1110-1160°C, the finishing rolling temperature is 860-900°C, and the finishing rolling temperature is 830-860°C.
  • the chemical element composition of the prepared non-quenched and tempered steel is as follows (mass percentage %): C: 0.36-0.42; Si: 0.60-0.75; Mn: 0.95-1.05; P: 0.020-0.045; S: 0.060-0.090; Cr: 0.100 -0.25; Ni: 0.010-0.20; Mo: 0.02-0.06; Al: 0.0070-0.010; Cu: 0.06-0.40; V: 0.20-0.35; Ti: 0.003; N: 0.0150-0.0200; the balance is Fe and impurities.
  • a suitable rolling heating temperature can make the microalloying elements in the material fully solid-melted in the austenite, and precipitate from the matrix in the form of a dispersed, fine granular second phase when cooled after rolling. In the subsequent forging and heating, it plays a role in hindering the growth of grains, so as to achieve the effect of grain refinement.
  • the obtained bar is heated to 1150° C., and the austenite grain size is inspected after holding for 15 minutes, and the austenite grain size is finer than the 8th grade.
  • the purpose is to ensure that the connecting rod has a finer grain size after the subsequent forging process.
  • the method for preparing fine-grain forgings from the non-quenched and tempered steel prepared by the above preparation method includes the steps of blanking, induction heating, roll forging, blowing, forging forming, punching and trimming, shaping and controlled cooling.
  • the chemical element composition of non-quenched and tempered steel is as follows (mass percentage %): C: 0.36-0.42; Si: 0.60-0.75; Mn: 0.95-1.05; P: 0.020-0.045; S: 0.060-0.090; Cr: 0.100-0.25 ; Ni: 0.010-0.20; Mo: 0.02-0.06; Al: 0.0070-0.010; Cu: 0.06-0.40; V: 0.20-0.35; Ti: 0.003; N: 0.0150-0.0200; the balance is Fe and impurities.
  • the temperature of the induction heating process is 1260-1280°C, and the appropriate heating temperature can make the second phase of the microalloy precipitated in the material after rolling can be fully dissolved in the austenite, so as to achieve the purpose of dispersion strengthening .
  • the temperature of the roll forging process is 1220 to 1250°C
  • the temperature of the forging forming is 1050-1100°C.
  • Adopting an appropriate forging temperature not only facilitates the forging of the material, but also reduces the dispersion and the fine second phase precipitated from the matrix after rolling and cooling, and the fine second phase is re-dissolved into the matrix to ensure that there are sufficient second phase particles to hinder recrystallization The grains grow up.
  • the roll forging process is to horizontally roll a dumbbell-shaped pre-forged piece with a round rod in the middle and spherical ends at both ends; the forging forming process is to forge the dumbbell-shaped pre-forged piece laterally, and forging to form a rear connecting rod.
  • the total deformation of the ribs is 75-80%, the total deformation of the big end is 35-40%, and the total deformation of the small end is 40-45%.
  • Adopting sufficient deformation can make the connecting rod more prone to complete dynamic recrystallization during forging, and increase the recrystallization nucleation rate, so as to achieve the effect of grain refinement.
  • the temperature of the punching and trimming process and the shaping process is 1000-1050°C.
  • the controlled cooling process is to suspend the workpieces on a cooling line moving forward at a certain speed.
  • the cooling method of rotating air blowing is adopted to cool the engine breaker connecting rod by blowing, so that the engine breaker connecting rod is cooled at a faster cooling rate. To a temperature below Ac1; then put it into the material box for centralized cooling, and slowly cool to room temperature at a slower cooling rate.
  • the cooling rate of the rotary air blowing is 3-5°C/s, preferably 5°C/s, and the cooling rate in the material box is not more than 2.0°C/s.
  • the main function of the controlled cooling process is to uniformly cool the workpiece under a large degree of supercooling, thereby reducing the energy for grain growth, and at the same time shortening the time for grain growth, thereby limiting the growth of grains , Achieved the purpose of controlling the grain size. Because the structure obtained by the rotary air blowing is relatively uniform, it is beneficial to the subsequent cutting and avoiding problems such as induction quenching deformation and cracking, and can further improve the fatigue performance.
  • the connecting rod is manufactured by using the above-mentioned non-quenched and tempered breaking connecting rod steel and the method for manufacturing fine-grained forgings.
  • the connecting rod is a solid whole composed of three parts of large and small head parts and a rod part. After forging and cooling, the grain size of the large and small heads of the finally obtained connecting rod is 8.5-9; the grain size of the rod of the connecting rod is finer than 10; the large and small heads and the rod
  • the organization is pearlite and ferrite.
  • the connecting rod forgings prepared by the present invention not only meet the relevant technical requirements of automobile connecting rods, but also effectively refine the grain size of the connecting rod, improve the strength, toughness and plasticity of the material, and achieve fine grain
  • the strengthening function effectively improves the comprehensive mechanical properties of the connecting rod, and solves the shortcomings of traditional non-quenched and tempered steel connecting rods with coarse grains after forging; and simplifies the production process to obtain good economic, social and environmental benefits.
  • the chemical element C 0.38%; Si: 0.69%; Mn: 1.003%; P: 0.0269%; S: 0.0813%; Cr: 0.168%; Ni: 0.061%; Mo: 0.0246%; Al: 0.0071%; Cu: 0.067%; V: 0.2822%; Ti: 0.003%; N: 0.015%, the balance of the non-quenched and tempered steel with Fe and impurities is heated to 1160°C; Rolling, cooling through water, and final rolling process to roll the material.
  • the start-rolling temperature is 1110°C and the final rolling temperature is 830°C.
  • the finishing temperature of the material is 860°C.
  • the diameter of the bar after rolling is 37mm. .
  • the above-mentioned bar material is induction heated to 1260°C; the bar material obtained after rolling is roll-forged through the process of roll forging and forging forming, the temperature of roll forging (pre-forging) is 1250°C; after roll forging, the workpieces are dispersed and placed at a certain speed On the advancing conveyor belt, the temperature is lowered to 1100°C and then the forging is carried out; the forging temperature is 1100°C, and the total deformation of the connecting rod I-beam after forging is 75-80% , The total deformation of the big head part is 35-40%, and the total deformation of the small head part is 40-45%; punching and trimming and straightening are carried out after the completion of forging.
  • the temperature of the workpiece after punching and trimming is about 1050°C.
  • the temperature after straightening is about 1030°C.
  • the workpieces are dispersed and hung on a cooling line that advances at a certain speed, and the rotating air blows are used for cooling.
  • the chemical element C 0.38%; Si: 0.69%; Mn: 1.003%; P: 0.0269%; S: 0.0813%; Cr: 0.168%; Ni: 0.061%; Mo: 0.0246%; Al: 0.0071%; Cu: 0.067%; V: 0.2822%; Ti: 0.003%; N: 0.015%, the balance is Fe and impurities of non-quenched and tempered steel heated to 1170°C; Rolling, cooling through water, and final rolling process to roll the material.
  • the start-rolling temperature is 1110°C and the final rolling temperature is 830°C.
  • the finishing temperature of the material is 860°C.
  • the diameter of the bar after rolling is 37mm. .
  • the above-mentioned bar material is induction heated to 1270°C; the bar material obtained after rolling is roll forged through the process of roll forging and forging forming, the temperature of roll forging (pre-forging) is 1240°C; after roll forging, the workpieces are dispersed and placed at a certain speed On the advancing conveyor belt, the temperature is reduced to 1070°C and then forging is carried out; the forging temperature is 1070°C, and the total deformation of the connecting rod I-beam after forging is 75-80% , The total deformation of the big head part is 35-40%, and the total deformation of the small head part is 40-45%; punching and trimming and straightening are carried out after forging.
  • the temperature of the workpiece after punching and trimming is about 1030°C.
  • the temperature after straightening is about 1010°C.
  • the workpieces are dispersed and hung on a cooling line that advances at a certain speed, and the rotating air blows are used for cooling.
  • the connecting rod is guaranteed to be cooled to 600°C at a cooling rate of 5°C/s, and then placed in the material box for centralized cooling, and cooled at a cooling rate of less than 1.8°C/s To room temperature to obtain the connecting rod.
  • the chemical element C 0.38%; Si: 0.69%; Mn: 1.003%; P: 0.0269%; S: 0.0813%; Cr: 0.168%; Ni: 0.061%; Mo: 0.0246%; Al: 0.0071%; Cu: 0.067%; V: 0.2822%; Ti: 0.003%; N: 0.015%, the balance is Fe and impurities of non-quenched and tempered steel heated to 1155°C; Rolling, cooling through water, and final rolling process to roll the material.
  • the start-rolling temperature is 1110°C and the final rolling temperature is 860°C.
  • the finishing temperature of the material is 900°C.
  • the diameter of the bar after rolling is 37mm. .
  • the above-mentioned bar material is induction heated to 1260°C; the bar material obtained after rolling is roll-forged through the process of roll forging and forging forming, the temperature of roll forging (pre-forging) is 1250°C; after roll forging, the workpieces are dispersed and placed at a certain speed On the advancing conveyor belt, the temperature is reduced to 1090°C and then the forging is carried out; the forging temperature is 1090°C, and the total deformation of the connecting rod I-beam after forging is 75-80% , The total deformation of the big head part is 35-40%, and the total deformation of the small head part is 40-45%; punching and trimming and straightening are carried out after the completion of forging.
  • the temperature of the workpiece after punching and trimming is about 1050°C.
  • the temperature after straightening is about 1030°C.
  • the workpieces are dispersed and hung on a cooling line that advances at a certain speed, and the rotating air blows are used for cooling.
  • the connecting rod is guaranteed to be cooled to 600°C at a cooling rate of 5°C/s, and then placed in the material box for centralized cooling, and cooled at a cooling rate of less than 1.8°C/s To room temperature to obtain the connecting rod.
  • the chemical element C 0.38%; Si: 0.69%; Mn: 1.003%; P: 0.0269%; S: 0.0813%; Cr: 0.168%; Ni: 0.061%; Mo: 0.0246%; Al: 0.0071%; Cu: 0.067%; V: 0.2822%; Ti: 0.003%; N: 0.015%, the balance is Fe and impurities of non-quenched and tempered steel heated to 1155°C; Rolling, cooling through water, and final rolling process to roll the material.
  • the start-rolling temperature is 1110°C and the final rolling temperature is 830°C.
  • the finishing temperature of the material is 860°C.
  • the diameter of the bar after rolling is 37mm. .
  • the above-mentioned bar material is induction heated to 1250°C; the bar material obtained after rolling is roll-forged through the process of roll forging and forging forming, the temperature of roll forging (pre-forging) is 1240°C; after roll forging, the workpieces are dispersed and placed at a certain speed On the advancing conveyor belt, the temperature is reduced to 1080 °C and then forging is performed; the temperature of the forging (final forging) is 1080 °C, and the total deformation of the connecting rod I-beam after forging is 75-80% , The total deformation of the big head part is 35-40%, and the total deformation of the small head part is 40-45%; punching and trimming and straightening are carried out after forging.
  • the temperature of the workpiece after punching and trimming is about 1040°C.
  • the temperature after straightening is about 1020°C.
  • the workpieces are dispersed and hung on a cooling line that advances at a certain speed, and the rotating air blows are used for cooling.
  • the connecting rod is guaranteed to be cooled to 600°C at a cooling rate of 5°C/s, and then placed in the material box for centralized cooling, and cooled at a cooling rate of less than 1.8°C/s To room temperature to obtain the connecting rod.
  • the connecting rod obtained in the above-mentioned Examples 1-4 is a solid body composed of the large and small head parts and the rod part in the forged state.
  • the grain size of the large and small heads of the connecting rod is 8.5-9; the grain size of the connecting rod is finer than 10, its tensile strength is greater than 1060MPa, the yield strength is greater than 800MPa, and the yield ratio is 0.75.
  • the hardness is greater than 304HB; the structures of the large and small head parts and the rod parts are both pearlite and ferrite. Among them, the three parts of the big end, small end and rod of the connecting rod are all pearlite and ferrite, which have good uniformity and high mechanical properties.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Forging (AREA)

Abstract

一种非调质钢的制备方法，棒材经开轧、穿水冷却、精轧、穿水冷却和终轧，轧制加热温度为1150-1200℃，开轧温度为1110-1160℃，精轧温度为860-900℃，终轧温度为830-860℃；一种非调质钢制备细晶锻件的方法，包括下料、感应加热、辊锻、吹风、锻造成型、冲孔切边、整形和控制冷却，感应加热温度为1260-1280℃，辊锻温度为1220-1250℃，锻造成型温度为1050-1100℃；该非调质钢制备的锻件有效细化了晶粒度，提高了材料的强度和韧性，简化了生产工艺。

Description

非调质钢的制备方法以及利用其制备细晶锻件的方法 技术领域
本发明涉及一种发动机非调质涨断连杆的制备方法，具体是一种发动机涨断连杆用钢及其细晶锻件的制备方法。
背景技术
近年来，随着汽车产业的不断优化升级，微合金非调质钢代替调质钢应用于汽车产业的优点日益突出，因其具有优异的加工性能、绿色节能的环境效益和较低的生产费用而日趋广泛地用于汽车锻件。连杆是汽车发动机中的主要零件之一，主要用于连接发动机的活塞和曲轴，要承受一定的压缩、拉伸等交变载荷，因此要求发动机连杆具有良好的力学性能。目前，发动机连杆大多采用调质钢制造，其繁琐的调质、校直、加工等工序，生产成本高、能量消耗大，加剧了环境污染，且存在淬火变形、开裂等质量问题，与汽车工业发展中的节能减排不相符。
发明内容
发明目的：为了克服现有技术中存在的不足，本发明提供了一种发动机非调质涨断连杆用钢及其细晶锻件的制备方法。能够有效细化连杆的晶粒度，提高材料的强度、韧性和塑性，有效提高连杆的综合力学性能，并可取消调质处理、简化加工工艺等。
技术方案：本发明的非调质钢的制备方法，包括开轧、穿水冷却、精轧、穿水冷却以及终轧的步骤，得到Φ37-40的非调质钢的棒材。
其中，轧制加热温度为1150-1200℃，其中，开轧温度为1110-1160℃，精轧温度为860-900℃，终轧温度为830-860℃。
制备的非调质钢的化学元素成分如下(质量百分比％)：C：0.36-0.42；Si：0.60-0.75；Mn：0.95-1.05；P：0.020-0.045；S：0.060-0.090；Cr：0.100-0.25；Ni：0.010-0.20；Mo：0.02-0.06；Al：0.0070-0.010；Cu：0.06-0.40；V：0.20-0.35；Ti：0.003；N：0.0150-0.0200；余量为Fe和杂质。
采用适宜的轧制加热温度，可以使材料中的微合金元素能够充分地固熔于奥氏体中，在轧制后冷却时以弥散、细小的颗粒状第二相的形式从基体中析出，在后续锻造加热时起到阻碍晶粒长大的作用，以此达到细化晶粒的作用。
终轧后，所得棒材加热至1150℃，保温15min后检验其奥氏体晶粒度，所述奥氏体晶粒度细于8级。其目的是为了确保连杆在经过后续锻造工序后，具 有较细的晶粒度。
利用上述的制备方法制备的非调质钢制备细晶锻件的方法，包括下料、感应加热、辊锻、吹风、锻造成型、冲孔切边、整形以及控制冷却的步骤。
非调质钢的化学元素成分如下(质量百分比％)：C：0.36-0.42；Si：0.60-0.75；Mn：0.95-1.05；P：0.020-0.045；S：0.060-0.090；Cr：0.100-0.25；Ni：0.010-0.20；Mo：0.02-0.06；Al：0.0070-0.010；Cu：0.06-0.40；V：0.20-0.35；Ti：0.003；N：0.0150-0.0200；余量为Fe和杂质。
其中，感应加热工序的温度为1260-1280℃，采用适宜的加热温度，可以使轧制后材料中析出的微合金第二相能够充分地固溶于奥氏体中，从而达到弥散强化的目的。
辊锻工序中(预锻)温度为1220-1250℃，锻造成型(终锻)温度为1050-1100℃，所述辊锻工序后，将工件分散放置于以一定速度前进的传送带上，并辅以吹风，使其温度降至1050-1150℃后再进行锻造成型工序。
采用适当的锻造温度，不仅有利于对材料进行锻造成型，还可以减少轧制冷却后从基体中析出的弥散、细小的第二相重新溶入基体，保证有充足的第二相颗粒阻碍再结晶晶粒长大。
所述辊锻工序是横向辊压成中部为圆杆、两端为球形的哑铃状预锻件；所述锻造成型工序是对所述哑铃状预锻件进行横向模锻，且锻造成型后连杆工字筋部位总变形量为75-80％，大头部位总变形量为35-40％，小头部位总变形量为40-45％。
采用足够的变形量可以使连杆锻造时更易发生完全动态再结晶，并提高再结晶形核率，从而达到起到细化晶粒的作用。
所述冲孔切边工序和整形工序的温度为1000-1050℃。
所述控制冷却工序是将工件分散悬挂于以一定速度前进的冷却线上，采用旋转吹风的冷却方式，对发动机涨断连杆进行吹风冷却，使发动机涨断连杆以较快的冷却速度冷至Ac1以下某一温度；然后放入料箱集中冷却，以较慢冷却速度缓慢冷却至室温。
旋转吹风的冷却速度为3-5℃/s，优选5℃/s，料箱中冷却速度不大于2.0℃/s。
所述控制冷却工序主要作用是使工件在较大的过冷度下均匀冷却，以此减少晶粒长大的能量，同时也缩短了晶粒长大的时间，从而限制了晶粒的长大， 达到了控制晶粒度的目的。由于旋转吹风获得的组织较为均匀，有利于后续的切削加工和避免感应淬火变形、开裂等问题，并可进一步提高疲劳性能等。然后放入料箱集中冷却，使工件以低于2.0℃/s冷却速度冷却至室温，可以让过冷奥氏体向铁素体和珠光体组织充分转变，获得细小的晶内铁素体和细小的珠光体组织，增强连杆的强韧性。
采用上述发动机非调质涨断连杆用钢及其细晶锻件的制造方法制造的连杆，所述连杆由大、小头部位和杆部三个部分构成的一个实心整体。经锻造和冷却后，最终所得连杆的大、小头部位晶粒度为8.5-9级；连杆的杆部晶粒度细于10级；所述大、小头部位和杆部的组织均为珠光体和铁素体。
有益效果：本发明制备的连杆锻件，在达到了汽车用连杆相关技术要求的同时，还有效细化了连杆的晶粒度，提高了材料的强度和韧、塑性，起到细晶强化的作用，有效提高了连杆的综合力学性能，解决了传统非调质钢连杆在锻造后晶粒粗大的缺点；而且简化了生产工艺，获得良好的经济效益、社会效益和环境效益。
具体实施方式
实施例1
将含有以下质量百分含量的化学元素C:0.38％；Si:0.69％；Mn:1.003％；P:0.0269％；S:0.0813％；Cr:0.168％；Ni:0.061％；Mo:0.0246％；Al:0.0071％；Cu:0.067％；V:0.2822％；Ti:0.003％；N:0.015％，余量为Fe和杂质的非调质钢加热至1160℃；通过开轧、穿水冷却、精轧、穿水冷却、终轧工序对材料进行轧制，开轧温度1110℃，终轧温度为830℃，其中材料的精轧温度为860℃，经轧制处理后所得棒材的直径为37mm。
将上述棒材感应加热至1260℃；通过辊锻和锻造成型工序对轧制后所得棒材进行辊锻，辊锻(预锻)温度为1250℃；辊锻后将工件分散放置于以一定速度前进的传送带上，并辅以吹风，使其温度降至1100℃后进行锻造成型；锻造成型(终锻)温度为1100℃，锻造成型后连杆工字筋部位总变形量为75-80％，大头部位总变形量为35-40％，小头部位总变形量为40-45％；锻造完成后进行冲孔切边和校直，工件冲孔切边后温度约为1050℃，工件校直后温度约为1030℃。校直完成后进入控制冷却工序。将工件分散悬挂于以一定速度前进的冷却线上，旋转吹风冷却。通过协调鼓风机的风量、外界环境温度等，借助红外线测温仪，保证连杆以5℃/s的冷却速度冷至600℃，然后放入料箱集中冷却，以小于1.8℃ /s冷却速度冷却至室温，得到所述连杆。
实施例2
将含有以下质量百分含量的化学元素C:0.38％；Si:0.69％；Mn:1.003％；P:0.0269％；S:0.0813％；Cr:0.168％；Ni:0.061％；Mo:0.0246％；Al:0.0071％；Cu:0.067％；V:0.2822％；Ti:0.003％；N:0.015％，余量为Fe和杂质的非调质钢加热至1170℃；通过开轧、穿水冷却、精轧、穿水冷却、终轧工序对材料进行轧制，开轧温度1110℃，终轧温度为830℃，其中材料的精轧温度为860℃，经轧制处理后所得棒材的直径为37mm。
将上述棒材感应加热至1270℃；通过辊锻和锻造成型工序对轧制后所得棒材进行辊锻，辊锻(预锻)温度为1240℃；辊锻后将工件分散放置于以一定速度前进的传送带上，并辅以吹风，使其温度降至1070℃后进行锻造成型；锻造成型(终锻)温度为1070℃，锻造成型后连杆工字筋部位总变形量为75-80％，大头部位总变形量为35-40％，小头部位总变形量为40-45％；锻造完成后进行冲孔切边和校直，工件冲孔切边后温度约为1030℃，工件校直后温度约为1010℃。校直完成后进入控制冷却工序。将工件分散悬挂于以一定速度前进的冷却线上，旋转吹风冷却。通过协调鼓风机的风量、外界环境温度等，借助红外线测温仪，保证连杆以5℃/s的冷却速度冷至600℃，然后放入料箱集中冷却，以小于1.8℃/s冷却速度冷却至室温，得到所述连杆。
实施例3
将含有以下质量百分含量的化学元素C:0.38％；Si:0.69％；Mn:1.003％；P:0.0269％；S:0.0813％；Cr:0.168％；Ni:0.061％；Mo:0.0246％；Al:0.0071％；Cu:0.067％；V:0.2822％；Ti:0.003％；N:0.015％，余量为Fe和杂质的非调质钢加热至1155℃；通过开轧、穿水冷却、精轧、穿水冷却、终轧工序对材料进行轧制，开轧温度1110℃，终轧温度为860℃，其中材料的精轧温度为900℃，经轧制处理后所得棒材的直径为37mm。
将上述棒材感应加热至1260℃；通过辊锻和锻造成型工序对轧制后所得棒材进行辊锻，辊锻(预锻)温度为1250℃；辊锻后将工件分散放置于以一定速度前进的传送带上，并辅以吹风，使其温度降至1090℃后进行锻造成型；锻造成型(终锻)温度为1090℃，锻造成型后连杆工字筋部位总变形量为75-80％，大头部位总变形量为35-40％，小头部位总变形量为40-45％；锻造完成后进行冲孔切边和校直，工件冲孔切边后温度约为1050℃，工件校直后温度约为1030℃。 校直完成后进入控制冷却工序。将工件分散悬挂于以一定速度前进的冷却线上，旋转吹风冷却。通过协调鼓风机的风量、外界环境温度等，借助红外线测温仪，保证连杆以5℃/s的冷却速度冷至600℃，然后放入料箱集中冷却，以小于1.8℃/s冷却速度冷却至室温，得到所述连杆。
实施例4
将含有以下质量百分含量的化学元素C:0.38％；Si:0.69％；Mn:1.003％；P:0.0269％；S:0.0813％；Cr:0.168％；Ni:0.061％；Mo:0.0246％；Al:0.0071％；Cu:0.067％；V:0.2822％；Ti:0.003％；N:0.015％，余量为Fe和杂质的非调质钢加热至1155℃；通过开轧、穿水冷却、精轧、穿水冷却、终轧工序对材料进行轧制，开轧温度1110℃，终轧温度为830℃，其中材料的精轧温度为860℃，经轧制处理后所得棒材的直径为37mm。
将上述棒材感应加热至1250℃；通过辊锻和锻造成型工序对轧制后所得棒材进行辊锻，辊锻(预锻)温度为1240℃；辊锻后将工件分散放置于以一定速度前进的传送带上，并辅以吹风，使其温度降至1080℃后进行锻造成型；锻造成型(终锻)温度为1080℃，锻造成型后连杆工字筋部位总变形量为75-80％，大头部位总变形量为35-40％，小头部位总变形量为40-45％；锻造完成后进行冲孔切边和校直，工件冲孔切边后温度约为1040℃，工件校直后温度约为1020℃。校直完成后进入控制冷却工序。将工件分散悬挂于以一定速度前进的冷却线上，旋转吹风冷却。通过协调鼓风机的风量、外界环境温度等，借助红外线测温仪，保证连杆以5℃/s的冷却速度冷至600℃，然后放入料箱集中冷却，以小于1.8℃/s冷却速度冷却至室温，得到所述连杆。
上述实施例1-4制得到的连杆，是由锻造状态的大、小头部位和杆部构成的一个实心整体。其中连杆的大、小头部位晶粒度为8.5～9级；连杆的杆部晶粒度细于10级，其抗拉强度大于1060MPa，屈服强度大于800MPa，屈强比在于0.75，硬度大于304HB；所述大、小头部位和杆部的组织均为珠光体和铁素体。其中连杆的大头部位、小头部位和杆部三个部分的组织均为珠光体和铁素体，具有较好的组织均匀性和较高的力学性。

Claims (10)

  1. 一种非调质钢的制备方法，其特征在于：包括开轧、穿水冷却、精轧、穿水冷却以及终轧的步骤，得到Φ37-40的非调质钢的棒材；
    其中，轧制加热温度为1150-1200℃，其中，开轧温度为1110-1160℃，精轧温度为860-900℃，终轧温度为830-860℃。
  2. 根据权利要求1所述的制备方法，其特征在于：终轧后，所得棒材加热至1150℃，保温15min后检验其奥氏体晶粒度。
  3. 根据权利要求1所述的制备方法，其特征在于：按质量百分比，制备所述非调质钢的各成分包括：C：0.36-0.42％；Si：0.60-0.75％；Mn：
    0.95-1.05％；P：0.020-0.045％；S：0.060-0.090％；Cr：0.100-0.25％；Ni：
    0.010-0.20％；Mo：0.02-0.06％；Al：0.0070-0.010％；Cu：0.06-0.40％；V：
    0.20-0.35％；Ti：0.003％；N：0.0150-0.0200％；余量为Fe和杂质。
  4. 一种利用权利要求1-3任一所述的非调质钢制备细晶锻件的方法，其特征在于：包括下料、感应加热、辊锻、吹风、锻造成型、冲孔切边、整形以及控制冷却的步骤；
    其中，感应加热工序的温度为1260-1280℃，辊锻工序中温度为1220-1250℃，锻造成型温度为1050-1100℃。
  5. 根据权利要求4所述的制备细晶锻件的方法，其特征在于：所述辊锻工序后，将工件分散放置并辅以吹风，使其温度降至1050-1150℃后再进行锻造成型工序。
  6. 根据权利要求4所述的制备细晶锻件的方法，其特征在于：所述辊锻工序是横向辊压成中部为圆杆、两端为球形的哑铃状预锻件。
  7. 根据权利要求6所述的制备细晶锻件的方法，其特征在于：所述锻造成型工序是对所述哑铃状预锻件进行横向模锻，且锻造成型后连杆工字筋部位总变形量为75-80％，大头部位总变形量为35-40％，小头部位总变形量为40-45％。
  8. 根据权利要求4所述的制备细晶锻件的方法，其特征在于：所述冲孔切边工序和整形工序的温度为1000-1050℃。
  9. 根据权利要求4所述的制备细晶锻件的方法，其特征在于：所述控制冷却工序是将工件分散悬挂并采用旋转吹风的冷却方式使其冷却至Ac1以下，然后放入料箱集中冷却至室温。
  10. 根据权利要求9所述的制备细晶锻件的方法，其特征在于：旋转吹风 的冷却速度为3-5℃/s，料箱中冷却速度不大于2.0℃/s。
PCT/CN2020/101763 2019-09-11 2020-07-14 非调质钢的制备方法以及利用其制备细晶锻件的方法 WO2021047277A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020217043399A KR20220036918A (ko) 2019-09-11 2020-07-14 비조질강의 제조방법 및 이를 이용한 미립자 단조품 제조방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910858409.XA CN110756583B (zh) 2019-09-11 2019-09-11 非调质钢的制备方法以及利用其制备细晶锻件的方法
CN201910858409.X 2019-09-11

Publications (1)

Publication Number Publication Date
WO2021047277A1 true WO2021047277A1 (zh) 2021-03-18

Family

ID=69329653

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/101763 WO2021047277A1 (zh) 2019-09-11 2020-07-14 非调质钢的制备方法以及利用其制备细晶锻件的方法

Country Status (3)

Country Link
KR (1) KR20220036918A (zh)
CN (1) CN110756583B (zh)
WO (1) WO2021047277A1 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114150117A (zh) * 2021-12-08 2022-03-08 南京工程学院 一种补救铁素体-珠光体型非调质钢锻件带状组织的方法
CN114672723A (zh) * 2022-02-18 2022-06-28 江阴兴澄特种钢铁有限公司 一种胀断连杆用46MnVS系列钢及其制造方法
CN115058657A (zh) * 2022-07-04 2022-09-16 刘朋飞 一种高速线材轧机生产拉丝用低碳钢及其控轧控冷工艺
CN115213646A (zh) * 2022-07-26 2022-10-21 陕西法士特齿轮有限责任公司 一种非调质钢取力器连接轴及其加工方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110756583B (zh) * 2019-09-11 2021-09-17 南京钢铁股份有限公司 非调质钢的制备方法以及利用其制备细晶锻件的方法
CN111408681B (zh) * 2020-04-13 2022-04-12 南宫市精强连杆有限公司 发动机非调质钢连杆锻后余热回火的方法
CN112222204B (zh) * 2020-09-04 2022-03-01 中天钢铁集团有限公司 一种发动机非调质连杆用钢的轧制方法和锻件的制造方法
CN112575251A (zh) * 2020-11-13 2021-03-30 南京钢铁股份有限公司 一种汽车发动机的中碳非调质曲轴用钢及其曲轴的制造方法
CN112372253B (zh) * 2020-11-20 2021-11-09 南京工程学院 一种发动机非调质曲轴用钢及其锻件的制备方法
CN114472519A (zh) * 2021-10-22 2022-05-13 南京钢铁股份有限公司 一种强穿水冷却易切削非调质钢的生产方法
CN115747634A (zh) * 2022-10-10 2023-03-07 南京钢铁股份有限公司 一种高品质非调质钢、曲轴及制备方法
CN117259662B (zh) * 2023-11-22 2024-02-06 江苏永钢集团有限公司 一种中碳微合金非调质胀断连杆的控锻控冷工艺

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030096892A (ko) * 2002-06-18 2003-12-31 현대자동차주식회사 비조질강 조성물 및 이를 이용한 커넥팅로드의 제조 방법
CN106555114A (zh) * 2016-10-19 2017-04-05 北京科技大学 铁素体+珠光体型非调质钢曲轴锻件的贝氏体控制方法
CN108246801A (zh) * 2017-12-29 2018-07-06 钢铁研究总院华东分院 一种大规格非调质钢轧制设备及其轧制生产方法
CN109234627A (zh) * 2018-10-17 2019-01-18 南京钢铁股份有限公司 一种高强高韧性非调质圆钢及制备方法
CN109609749A (zh) * 2018-12-29 2019-04-12 中国重汽集团济南动力有限公司 一种模铸非调质钢曲轴毛坯加工性能改善方法
CN110756583A (zh) * 2019-09-11 2020-02-07 南京钢铁股份有限公司 非调质钢的制备方法以及利用其制备细晶锻件的方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3456375B2 (ja) * 1997-07-28 2003-10-14 住友金属工業株式会社 高強度・低延性非調質鋼
CN101433939A (zh) * 2008-10-10 2009-05-20 白城中一精锻股份有限公司 涨断式连杆精密锻造工艺
CN101892424B (zh) * 2010-08-09 2011-09-21 钢铁研究总院 一种胀断连杆用中碳非调质钢
CN102586558A (zh) * 2011-01-05 2012-07-18 南京工程学院 一种提高非调质钢锻件韧性的制造工艺
CN103290187B (zh) * 2013-05-06 2014-10-29 河北钢铁股份有限公司承德分公司 一种细化低碳钢线材组织的方法
CN104775081A (zh) * 2015-04-21 2015-07-15 宝山钢铁股份有限公司 一种撑断连杆用高碳非调质钢及其制造方法
CN107470852B (zh) * 2016-06-07 2019-04-09 南京工程学院 一种非调质半轴及其制造方法
CN110205547A (zh) * 2019-06-13 2019-09-06 山东钢铁股份有限公司 一种凸轮轴用非调质钢及其制备方法
CN110576042B (zh) * 2019-09-11 2021-07-09 南京工程学院 一种发动机涨断连杆及用钢的制法和其锻件的制法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030096892A (ko) * 2002-06-18 2003-12-31 현대자동차주식회사 비조질강 조성물 및 이를 이용한 커넥팅로드의 제조 방법
CN106555114A (zh) * 2016-10-19 2017-04-05 北京科技大学 铁素体+珠光体型非调质钢曲轴锻件的贝氏体控制方法
CN108246801A (zh) * 2017-12-29 2018-07-06 钢铁研究总院华东分院 一种大规格非调质钢轧制设备及其轧制生产方法
CN109234627A (zh) * 2018-10-17 2019-01-18 南京钢铁股份有限公司 一种高强高韧性非调质圆钢及制备方法
CN109609749A (zh) * 2018-12-29 2019-04-12 中国重汽集团济南动力有限公司 一种模铸非调质钢曲轴毛坯加工性能改善方法
CN110756583A (zh) * 2019-09-11 2020-02-07 南京钢铁股份有限公司 非调质钢的制备方法以及利用其制备细晶锻件的方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114150117A (zh) * 2021-12-08 2022-03-08 南京工程学院 一种补救铁素体-珠光体型非调质钢锻件带状组织的方法
CN114150117B (zh) * 2021-12-08 2024-01-19 南京工程学院 一种补救铁素体-珠光体型非调质钢锻件带状组织的方法
CN114672723A (zh) * 2022-02-18 2022-06-28 江阴兴澄特种钢铁有限公司 一种胀断连杆用46MnVS系列钢及其制造方法
CN115058657A (zh) * 2022-07-04 2022-09-16 刘朋飞 一种高速线材轧机生产拉丝用低碳钢及其控轧控冷工艺
CN115213646A (zh) * 2022-07-26 2022-10-21 陕西法士特齿轮有限责任公司 一种非调质钢取力器连接轴及其加工方法

Also Published As

Publication number Publication date
CN110756583A (zh) 2020-02-07
KR20220036918A (ko) 2022-03-23
CN110756583B (zh) 2021-09-17

Similar Documents

Publication Publication Date Title
WO2021047277A1 (zh) 非调质钢的制备方法以及利用其制备细晶锻件的方法
CN108330390B (zh) 一种耐延迟断裂的合金冷镦钢盘条及其生产方法
CN110576042B (zh) 一种发动机涨断连杆及用钢的制法和其锻件的制法
CN102417965B (zh) 一种轧机45Cr4NiMoV合金钢大型支承辊锻后热处理工艺
CN107385329A (zh) 一种大厚度q500gje高强度建筑结构用钢板及其制造方法
CN107557673B (zh) 一种高延伸率高强热轧酸洗钢板及其制造方法
CN109023103B (zh) 一种贝氏体冷镦钢盘条的生产方法
CN103966411B (zh) 一种中碳冷镦钢棒线材的制造方法
CN111826587A (zh) 一种大规格风电螺栓用冷镦钢热轧盘条及其制备方法
CN113245365A (zh) 一种在线提升钢材韧性的轧制生产方法
US11384406B2 (en) Production method for inline increase in precipitation toughening effect of Ti microalloyed hot-rolled high-strength steel
US10557183B2 (en) Work hardenable yield ratio-controlled steel and method of manufacturing the same
CN114134399A (zh) 一种节能的高贝氏体含量的高合金工具用钢盘条及其制造方法
CN103350116A (zh) 一种有利于Cr、Mo钢球化退火的轧制工艺
CN104073744B (zh) 厚度≥18.5mm的高韧性X80管线钢板卷及生产方法
CN109136757A (zh) 中碳冷镦钢线材和中碳冷镦钢线材的生产方法
WO2022174530A1 (zh) 易切削非调质钢及其制备方法
CN109628833B (zh) 一种Cr-Mo-Si-V系冷作模具钢及其制备方法
CN111979499A (zh) 一种低成本q460c厚规格钢板生产方法
CN116900178A (zh) 一种高Cr-Si合金化免镀层热成形钢的进阶热冲压成形方法
CN114622064B (zh) 一种MnCr系列低碳齿轮钢的球化退火方法
CN114703431B (zh) 一种热作模具钢及退火组织均匀化的热处理工艺
CN105821348A (zh) 一种汽车转向系统球销钢及其制造方法
WO2022166038A1 (zh) 非调质钢长杆螺栓及其制造方法
CN110695097A (zh) 一种非调质凸轮轴及用钢的制法和其细晶锻件的制法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20862181

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20862181

Country of ref document: EP

Kind code of ref document: A1