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Method for preparing non-quenched and tempered steel and method for preparing fine-grained forging using the same

A technology of non-quenched and tempered steel and forgings, which is applied in the field of preparation of non-quenched and tempered connecting rods for engines, can solve the problems of high energy consumption, tediousness, and aggravated environmental pollution, and achieve the improvement of comprehensive mechanical properties, simplification of production technology, and solution Effect of Coarse Grain

Active Publication Date: 2021-09-17
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] Containing the following percentages of chemical elements by mass 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 being Fe and impurities microalloyed steel was heated to 1160 ℃; by open rolling, water cooling, fine rolling, water cooling, the material is a finishing rolling step, start rolling temperature 1110 deg.] C, finishing temperature 830 ℃, wherein the material is a finishing temperature of 860 deg.] C, the resulting treated after rolling rod having a diameter of 37mm .

[0024] The above-mentioned induction heating bar to 1260 deg.] C; by roll forging step and forging rods after rolling obtained by roll forging, roll forging (blocker) temperature of 1250 deg.] C; after roll forging a workpiece is placed in a constant speed dispersed advancing on the conveyor, and supplemented with hair, it is forged after molding temperature was lowered to 1100 ℃; f...

Embodiment 2

[0026] Containing the following percentages of chemical elements by mass 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 being Fe and impurities microalloyed steel was heated to 1170 ℃; by open rolling, water cooling, fine rolling, water cooling, the material is a finishing rolling step, start rolling temperature 1110 deg.] C, finishing temperature 830 ℃, wherein the material is a finishing temperature of 860 deg.] C, the resulting treated after rolling rod having a diameter of 37mm .

[0027] The above-mentioned induction heating bar to 1270 ℃; by roll forging step and forging rods after rolling obtained by roll forging, roll forging (blocker) temperature of 1240 ℃; roll after forging a workpiece is placed in a constant speed dispersed advancing on the conveyor, and supplemented with hair, it is forged after molding temperature was lowered to 1070 ℃; forging (forg...

Embodiment 3

[0029]Chemical element C: 0.38% of the following mass percent; 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 margin is a non-regulating steel heating from Fe and impurities heating to 1155 ° C; through the rolling, water cooling, fine Rolling, water-water cooling, the final rolling process is rolled on the material, the opening temperature is 1110 ° C, the final rolling temperature is 860 ° C, wherein the finishing temperature of the material is 900 ° C, and the rolled rod obtained after the rolling treatment is 37mm. .

[0030] The above-mentioned bar material should be heated to 1260 ° C; the rolling after rolling is rolled by rolling and forged steps, and the roll forged (precangled) temperature is 1250 ° C; the roll is dispersed after a certain speed after a certain speed. On the conveyor belt, and supplemented to the blow, it is reduced to 1090 ° C for forging; the forged (fi...

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Abstract

The invention discloses a steel for engine non-quenched and tempered expansion-broken connecting rod and a method for manufacturing the fine-grained forging thereof. The preparation method of the steel for the connecting rod includes rolling the non-quenched and tempered steel into a bar of Φ37-40. The bar is subjected to opening rolling, water cooling, finishing rolling, water cooling and final rolling; the rolling heating temperature is 1150-1200°C, the starting rolling temperature is 1110-1160°C, and the finishing rolling temperature is 860-900°C , the final rolling temperature is 830-860°C; the preparation method of the fine-grained forging for the connecting rod includes blanking, induction heating, roll forging, blowing, forging, punching and trimming, shaping and controlled cooling, the connecting rod The temperature of induction heating is 1260-1280°C, the temperature of roll forging is 1200-1250°C, and the temperature of forging is 1050-1100°C. The connecting rod prepared by the invention effectively refines the grain size of the connecting rod, improves the strength, toughness and plasticity of the material, and simplifies the production process.

Description

Technical field [0001] The present invention relates to a method for preparing an engine non-quenched mass broken up link, in particular an engine connecting rod up off fine grain steel and preparation method of forging. Background technique [0002] In recent years, with the upgrading of the automobile industry, micro alloy microalloyed steel instead of quenched and tempered steel used in the automotive industry advantage increasingly prominent, because of its excellent processability, green energy and environmental benefits of lower production costs and the increasingly widely used in automotive forgings. Link is one of the main parts of automobile engine, the piston and the crankshaft of the engine is mainly used to connect, to withstand a certain compression, stretching alternating load, and therefore requires the engine link having good mechanical properties. Currently, most of the engine using the link quenched steel, which is cumbersome quenching, straightening and machini...

Claims

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Application Information

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Patent Type & Authority Patents(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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