Method for manufacturing pin shaft through forging

A pin-to-forging ratio technology, applied in the forging field, can solve the problems of failure to meet standards, very high pin performance requirements, and inability to achieve localization, so as to meet technical requirements and improve reliability

Inactive Publication Date: 2010-06-09
上海新闵重型锻造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, castings and forgings used in mega-kilowatt nuclear power construction projects, such as pin shafts, have very high performance requirements for pin shafts due to their special service environment, and general heat treatment methods cannot meet the standards
At present, the above-mentioned pin shafts for nuclear power cannot be localized, and most of them are ordered from abroad.

Method used

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  • Method for manufacturing pin shaft through forging
  • Method for manufacturing pin shaft through forging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: the requirement of manufacturing process among the present embodiment is:

[0028] 1. Material selection:

[0029] Choose 12" square ingot, the chemical composition of the 12" square ingot should meet the following requirements:

[0030] 0.37%≤C≤0.44%, trace ≤Si≤0.35%, 0.70%≤Mn≤0.90%, trace ≤P≤0.025%, trace ≤S≤0.025%, 0.70%≤Cr≤0.95%, 0.30% ≤Mo≤0.40%, 1.60%≤Ni≤2.00%, trace ≤Cu≤0.20%, the balance is Fe and unavoidable impurities.

[0031] 2. Forging:

[0032] Cutting percentage of ingot head and ingot tail: 13% of steel ingot cutting head and 5% of tail cutting.

[0033] 1) Heating the steel ingot to 800°C, holding it for 2 hours, then heating it for 3 hours to make the temperature reach 1180°C, holding it for 1.5 hours and pulling out the billet;

[0034] 2) Heating the workpiece to 1180°C, and performing elongation-upsetting, and then rounding, straightening, and correcting the dimensions so that the forging ratio is not less than 4, so as to forge the...

Embodiment 2

[0046] Embodiment 2: the requirement of manufacturing process among the present embodiment is:

[0047] 1. Material selection:

[0048] Choose 12" square ingot, the chemical composition of the 12" square ingot should meet the following requirements:

[0049] 0.37%≤C≤0.44%, trace ≤Si≤0.35%, 0.70%≤Mn≤0.90%, trace ≤P≤0.025%, trace ≤S≤0.025%, 0.70%≤Cr≤0.95%, 0.30% ≤Mo≤0.40%, 1.60%≤Ni≤2.00%, trace ≤Cu≤0.20%, the balance is Fe and unavoidable impurities.

[0050] 2. Forging:

[0051] Cutting percentage of ingot head and ingot tail: 13% of steel ingot cutting head and 5% of tail cutting.

[0052] 1) Heating the steel ingot to 800°C, holding it for 2 hours, then heating it for 3 hours to make the temperature reach 1180°C, holding it for 1.5 hours and pulling out the billet;

[0053] 2) Heating the workpiece to 1180°C, and performing elongation-upsetting, and then rounding, straightening, and correcting the dimensions so that the forging ratio is not less than 4, so as to forge the...

Embodiment 3

[0065] Embodiment 3: the requirement of manufacturing process among the present embodiment is:

[0066] 1. Material selection:

[0067] Choose 12" square ingot, the chemical composition of the 12" square ingot should meet the following requirements:

[0068] 0.37%≤C≤0.44%, trace ≤Si≤0.35%, 0.70%≤Mn≤0.90%, trace ≤P≤0.025%, trace ≤S≤0.025%, 0.70%≤Cr≤0.95%, 0.30% ≤Mo≤0.40%, 1.60%≤Ni≤2.00%, trace ≤Cu≤0.20%, the balance is Fe and unavoidable impurities.

[0069] 2. Forging:

[0070] Cutting percentage of ingot head and ingot tail: 13% of steel ingot cutting head and 5% of tail cutting.

[0071] 1) Heating the steel ingot to 800°C, holding it for 2 hours, then heating it for 3 hours to make the temperature reach 1180°C, holding it for 1.5 hours and pulling out the billet;

[0072] 2) Heating the workpiece to 1180°C, and performing elongation-upsetting, and then rounding, straightening, and correcting the dimensions so that the forging ratio is not less than 4, so as to forge the...

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Abstract

The invention relates to the technical field of forging, particularly to a method for manufacturing a pin shaft through forging, which comprises the following steps of: selecting a proper steel ingot, and repeatedly upsetting and lengthening the steel ingot at the temperature of 1,180-850 DEG C to enable the forging ratio to be not less than 4; then sequentially carrying out performance heat treatment and machining to obtain the pin shaft. The method has the advantages that each performance index of the pin shaft manufactured by using the method satisfies the standard requirement of RCC-M, and ensures the use requirement of the pin shaft for a nuclear power plant, thereby greatly enhancing the security and the reliability and satisfying the technical requirement of such products.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a method for manufacturing pin shafts by forging. Background technique [0002] In recent years, power shortage has become a bottleneck restricting the sustained and rapid development of China's economy. As an important measure to save energy and adjust energy structure, nuclear power has been included in the national power development plan. The development of my country's nuclear power industry has a history of more than 30 years. It has always been based on the research and trial production of small-scale nuclear power equipment, and has not formed mature manufacturing technology and production equipment capabilities. Therefore, the development of nuclear power in our country is developing in the direction of high power. [0003] At present, castings and forgings used in mega-kilowatt nuclear power construction projects, such as pin shafts, have very high performance requireme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B21K1/06B21J1/06C22C38/44
Inventor 王兴中王元华
Owner 上海新闵重型锻造有限公司
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