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Production method of S42Cr1S forge piece for piston rod of marine diesel engine

A technology for marine diesel engines and production methods, applied to pistons and other directions, can solve problems such as excessive strength, poor hardenability, and large strength differences

Inactive Publication Date: 2020-10-23
ZHANGJIAGANG HAIGUO HEAVY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the marine diesel engine piston rods on the market today are forged from S30MnH material, but the piston rods produced by using S30MnH material often have problems such as large difference in strength at both ends, excessive strength, poor hardenability, poor toughness, and small plasticity.

Method used

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  • Production method of S42Cr1S forge piece for piston rod of marine diesel engine
  • Production method of S42Cr1S forge piece for piston rod of marine diesel engine

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Embodiment Construction

[0017] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0018] The production method of S42Cr1S forgings for marine diesel engine piston rods, the steps are as follows: blanking→forging→quenching and tempering heat treatment→rough turning→UT flaw detection→finish turning;

[0019] 1), blanking: take S42Cr1S steel as the raw material ingot, and its chemical composition requirements are as follows: C: 0.41-0.45%, Si: 0.15-0.35%, Mn: 0.70-0.80%, P: ≤0.015%, S: ≤ 0.015%, Cr: 1.05-1.20%, Mo: 0.20-0.25%, Ni: ≤0.25%, Al: 0.015-0.030%, Cu: ≤0.20%, H: ≤2ppm, O: ≤15ppm, N: ≤70ppm , CEV: ≥0.81%, the balance is Fe; said CEV=C+Mn / 6+(Cu+Ni) / 15+(Cr+Mo+V) / 5, adopt electric furnace+ladle refining+ The smelting method of vacuum refining;

[0020] 2) Forging: Put the steel ingot into the forging furnace after preheating, heat the forging furnace to make the temperature of the steel ingot reach 1220±2°C and keep it warm...

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Abstract

The invention discloses a production method of a S42Cr1S forge piece for a piston rod of a marine diesel engine. The method comprises the following steps of 1) blanking, 2) forging, 3) quenching and tempering, 4) rough turning, 5) UT flaw detection and 6) finish turning, wherein during blanking, S42Cr1S #steel serves as a raw material steel ingot comprising 0.41-0.45% of C, 0.15-0.35% of Si, 0.70-0.80% of Mn, 0-0.015% of P, 0-0.015% of S, 1.05-1.20% of Cr, 0.20-0.25% of Mo, 0-0.25% of Ni, 0.015-0.030% of Al, 0-0.20% of Cu, 0-2 ppm of H, 0-15 ppm of O, 0-70 ppm of N, larger than or equal to 0.81% of CEV and the balance Fe.

Description

technical field [0001] The invention relates to a production method of a S42Cr1S forging for a marine diesel engine piston rod. Background technique [0002] Marine diesel engines have the advantages of large power range, high thermal efficiency, good economic performance, easy starting, convenient use and maintenance, etc. The piston rod in a diesel engine is its main component. Most of the marine diesel engine piston rods on the market today are forged from S30MnH material, but the piston rods produced by using S30MnH material often have problems such as large difference in strength at both ends, excessive strength, poor hardenability, poor toughness, and small plasticity. . Contents of the invention [0003] The object of the present invention is to provide a method for producing a S42Cr1S forging for a marine diesel engine piston rod that can improve the toughness, plasticity and hardenability of the piston rod. [0004] In order to achieve the above object, the tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/42C21D1/18B23P15/00B21K1/18
CPCB21K1/18B23P15/00C21D1/18C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44
Inventor 盛雪华刘树军姚强
Owner ZHANGJIAGANG HAIGUO HEAVY FORGING
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