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Steel for medium-carbon non-quenched and tempered crankshaft of automobile engine as well as crankshaft manufacturing method

An automobile engine, non-quenched and tempered technology, applied in the field of metal forging, can solve the problems of insufficient toughness and plasticity, excess strength, etc., achieve the effects of simplifying the production process, increasing the content of ferrite, and solving the insufficient toughness and plasticity

Pending Publication Date: 2021-03-30
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: the purpose of the invention is to provide a medium-carbon non-tempered crankshaft steel for automobile engines and a method for manufacturing the crankshaft, which solves the problem that the existing engine crankshaft has excess strength and insufficient toughness and plasticity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Will contain chemical elements C: 0.38%; Si: 0.43%; Mn: 1.38%; S: 0.060%; Ni: 0.02%; P: 0.010%; Cr: 0.10%; : 0.008%; Al: 0.010%; Ti: 0.010%; N: 147ppm, non-quenched and tempered steel with the balance being Fe and impurities heated to 1250°C; Carry out rolling, the starting rolling temperature is 1100°C, and the final rolling temperature is 1000°C. After rolling, the non-quenched and tempered crankshaft steel is rolled into a bar with a diameter of 98mm, and the above-mentioned bar is heated to 1150°C. After 15 minutes, the austenite grain size of the bar is finer than 4.5 grades; then the bar is used as the blank, after blanking, forging induction heating, roll forging, primary cooling control, forging molding, edge trimming and secondary control Cold, in which the forging induction heating temperature is 1200°C, the rolled bar is forged through the roll forging and forging forming process, the roll forging (pre-forging) temperature is 1150°C, and the roll forging uses...

Embodiment 2

[0019] Will contain chemical elements C: 0.39%; Si: 0.45%; Mn: 1.40%; S: 0.030%; Ni: 0.03%; P: 0.014%; Cr: 0.14%; : 0.01%; Al: 0.012%; Ti: 0.005%; N: 136ppm, non-quenched and tempered steel with the balance being Fe and impurities heated to 1230°C; Carry out rolling, the starting rolling temperature is 1120°C, and the final rolling temperature is 980°C. After rolling, the non-quenched and tempered crankshaft steel is rolled into a bar with a diameter of 98mm, and the above bar is heated to 1150°C and kept warm. After 15 minutes, the austenite grain size of the bar is finer than 4.5 grades; then the bar is used as the blank, after blanking, forging induction heating, roll forging, primary cooling control, forging molding, edge trimming and secondary control Cold, in which the temperature of forging induction heating is 1180°C, the rolled bar is forged through roll forging and forging forming process, the temperature of roll forging (pre-forging) is 1160°C, roll forging uses tra...

Embodiment 3

[0021]Will contain chemical elements C: 0.35%; Si: 0.50%; Mn: 1.50%; S: 0.036%; Ni: 0.02%; : 0.006%; Al: 0.015%; Ti: 0.002%; N: 147ppm, non-quenched and tempered steel with the balance being Fe and impurities heated to 1245°C; Carry out rolling, the starting rolling temperature is 1125°C, and the final rolling temperature is 990°C. After rolling, the non-quenched and tempered crankshaft steel is rolled into a bar with a diameter of 95mm, and the above bar is heated to 1150°C and kept warm. After 15 minutes, the austenite grain size of the bar is finer than 4.5 grades; then the bar is used as the blank, after blanking, forging induction heating, roll forging, primary cooling control, forging molding, edge trimming and secondary control Cold, in which the forging induction heating temperature is 1200°C, the rolled bar is forged through the roll forging and forging forming process, the roll forging (pre-forging) temperature is 1165°C, and the roll forging uses transverse rolls to...

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Abstract

The invention discloses steel for a medium-carbon non-quenched and tempered crankshaft of an automobile engine as well as a crankshaft manufacturing method. The crankshaft manufacturing method comprises the following steps: at first, rolling the steel for the non-quenched and tempered crankshaft into a bar of 90-100 mm finally through rolling heating, initial rolling, water-crossing cooling and final rolling, wherein the rolling heating temperature reaches 1200-1250 DEG C, the initial rolling temperature reaches 1100-1130 DEG C, and the final rolling temperature reaches 950-1000 DEG C; and then, adopting the bar as a blank, and acquiring the medium-carbon non-quenched and tempered crankshaft through blanking, forging and induction heating, roll forging, primary controlled cooling, forgingforming, trimming, and secondary controlled cooling. According to the crankshaft prepared through the crankshaft manufacturing method, the ferrite content of the medium-carbon non-quenched and tempered crankshaft is effectively controlled, crystalline grains of the medium-carbon non-quenched and tempered crankshaft are refined, the material toughness and plasticity are improved, and the comprehensive mechanical properties of the non-quenched and tempered crankshaft are improved.

Description

technical field [0001] The invention belongs to the technical field of metal forging, and in particular relates to a medium-carbon non-quenched and tempered crankshaft steel for an automobile engine and a manufacturing method thereof. Background technique [0002] The crankshaft of the engine is subjected to the centrifugal force of the rotating mass, the periodically changing gas inertial force and the reciprocating inertial force when it is working, so the engine crankshaft is required to have good mechanical properties. At present, the non-quenched and tempered engine crankshaft has been widely used in automobile engines, but its shortcomings of excess strength and insufficient toughness and plasticity limit its application to high-end automobile engines. Contents of the invention [0003] Purpose of the invention: the purpose of the invention is to provide a medium-carbon non-tempered crankshaft steel for automobile engines and a manufacturing method thereof, which sol...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50C22C38/60F16C3/06C21D8/00
CPCC22C38/02C22C38/04C22C38/60C22C38/44C22C38/42C22C38/06C22C38/46C22C38/50C22C38/001F16C3/06C21D8/005C21D2211/009C21D2211/005
Inventor 周蕾冯宇阳刘磊刘文学邓伟孙华魏刚武赵秀明吴萌毛向阳刘凯旋
Owner NANJING IRON & STEEL CO LTD
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