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Preparation method for non-quenched and tempered steel and method for preparing fine-grain forged piece through non-quenched and tempered steel

A non-quenched and tempered steel, fine-grained technology, applied in the direction of mechanical equipment, manufacturing tools, temperature control, etc., can solve the problems of high energy consumption, high production cost, cumbersome, etc., to improve the comprehensive mechanical properties, good economic benefits, solve Effect of Coarse Grain

Active Publication Date: 2020-02-07
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most engine connecting rods are made of quenched and tempered steel. The cumbersome processes of quenching and tempering, straightening, and processing lead to high production costs, high energy consumption, aggravated environmental pollution, and quality problems such as quenching deformation and cracking. Energy saving and emission reduction in industrial development do not match

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chemical elements 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%, and the balance is Fe and impurities. The non-quenched and tempered steel is heated to 1160 °C; Rolling, water cooling, and final rolling processes are used to roll the material. The starting rolling temperature is 1110°C, and the final rolling temperature is 830°C. The finishing rolling temperature of the material is 860°C. The diameter of the bar obtained after rolling is 37mm. .

[0024] Inductively heat the above bars to 1260°C; carry out roll forging on the rolled bars through the roll forging and forging forming process, the roll forging (pre-forging) temperature is 1250°C; On the moving conveyor belt, supplemented by blowing, the temperature is lowered to 1100°C and then forged; the forging (final forging) temperature is 1100°C, and the total deformation of the I-shaped rib of the connecting rod a...

Embodiment 2

[0026] The chemical elements 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%, and the balance is Fe and impurities. The non-quenched and tempered steel is heated to 1170 °C; Rolling, water cooling, and final rolling processes are used to roll the material. The starting rolling temperature is 1110°C, and the final rolling temperature is 830°C. The finishing rolling temperature of the material is 860°C. The diameter of the bar obtained after rolling is 37mm. .

[0027] Inductively heat the above bars to 1270°C; roll forge the rolled bars through the roll forging and forging forming process, the roll forging (pre-forging) temperature is 1240°C; On the moving conveyor belt, supplemented by blowing, the temperature is lowered to 1070°C and then forged; the forging (final forging) temperature is 1070°C, and the total deformation of the I-shaped rib of the connecting rod after forging is...

Embodiment 3

[0029]The chemical elements 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%, and the balance is Fe and impurities. The non-quenched and tempered steel is heated to 1155 °C; Rolling, water cooling, and final rolling processes are used to roll the material. The starting rolling temperature is 1110°C and the final rolling temperature is 860°C. The finishing rolling temperature of the material is 900°C. The diameter of the bar obtained after rolling is 37mm. .

[0030] Inductively heat the above bars to 1260°C; carry out roll forging on the rolled bars through the roll forging and forging forming process, the roll forging (pre-forging) temperature is 1250°C; On the moving conveyor belt, supplemented by air blowing, the temperature is lowered to 1090°C and then forged; the forging (final forging) temperature is 1090°C, and the total deformation of the I-shaped rib of the connecting rod...

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Abstract

The invention discloses steel for an engine non-quenched and tempered expanded-forged connection rod, and a preparation method for a fine-grain forged piece. A preparation method for the steel for theconnection rod comprises the steps that non-quenched and tempered steel is rolled into a phi37-40 bar, and the bar is subjected to initial rolling, water cooling, precision rolling, water cooling andfinal rolling, wherein the rolling heating temperature is 1150-1200 DEG C, the initial rolling temperature is 1110-1160 DEG C, the precision rolling temperature is 860-900 DEG C, and the final rolling temperature is 830-860 DEG C. The preparation method for the fine-grain forged piece for the connection rod comprises the steps of blanking, induction heating, roll forging, air blowing, forging molding, punching and edge cutting, shaping, and controlled cooling, wherein the connection rod induction heating temperature is 1260-1280 DEG C, the roll forging temperature is 1200-1250 DEG C, and theforging molding temperature is 1050-1100 DEG C. According to the connection rod prepared through the steel and the method, the grain size of the connection rod is effectively decreased, the material strength, toughness and plasticity are improved, and the production technology is simplified.

Description

technical field [0001] The invention relates to a method for preparing a non-quenched and tempered connecting rod for an engine, in particular to a method for preparing a steel for a connecting rod for an engine and a fine-grained forging thereof. Background technique [0002] In recent years, with the continuous optimization and upgrading of the automobile industry, the advantages of micro-alloyed non-quenched and tempered steel instead of quenched and tempered steel in the automobile industry have become increasingly prominent, because of its excellent processing performance, environmental benefits of green energy saving and low production costs And it is increasingly widely used in automobile forgings. 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 certain alternating loads such as compression and tension. Therefore, the engine connecting rod is required to have g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B3/00B21B3/02B21B37/74B21J5/00B21J1/06B21K1/76B21K29/00C22C38/60C22C38/50C22C38/46C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02C21D8/06C21D11/00
CPCB21B3/00B21B3/02B21B37/74B21J5/002B21J1/06B21K1/766B21K29/00C22C38/60C22C38/50C22C38/46C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02C22C38/002C22C38/001C21D8/065C21D11/005B21B2003/001B21B2201/02
Inventor 周蕾刘磊赵秀明刘文学孙华冯宇阳
Owner NANJING IRON & STEEL CO LTD
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