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Method for forging bearing support forge piece

A technology of forging and forging ratio, applied in the direction of manufacturing tools, engine components, furnace types, etc., can solve problems such as failure to meet standards, very high performance requirements for forgings, and inability to achieve localization, and achieve reliability improvement and meet technical requirements. Effect

Active Publication Date: 2010-07-07
上海新闵重型锻造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, large castings and forgings used in mega-kilowatt nuclear power construction projects, such as forgings for supporting supports for reactor pressure vessels, have very high performance requirements for forgings due to their special service environment, which cannot be achieved by general heat treatment methods. standard
At present, the above-mentioned forgings for nuclear power bearings cannot be localized, and they are mostly ordered from abroad.

Method used

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  • Method for forging bearing support forge piece
  • Method for forging bearing support forge piece
  • Method for forging bearing support forge piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the requirement of manufacturing process among the present embodiment is:

[0033] 1. Material selection:

[0034] Choose 24 "square ingot, 3670Kg / support, the chemical composition of this 24 " square ingot should meet the following regulations:

[0035] Trace ≤ C ≤ 0.22%, 0.10% ≤ Si ≤ 0.30%, 1.15% ≤ Mn ≤ 1.60%, Trace ≤ P ≤ 0.015%, Trace ≤ S ≤ 0.012%, 0.50% ≤ Ni ≤ 0.80%, Trace ≤Cr≤0.20%, 0.40%≤Mo≤0.60%, trace ≤V≤0.01%, trace ≤Cu≤0.10%, 0.01%≤Al≤0.04%, trace ≤Co≤0.03%, the balance is Fe and unavoidable impurities.

[0036] 2. Forging:

[0037] Cutting percentage of ingot head and ingot tail: 17% cut head and 8% cut tail of steel ingot.

[0038] a) Heat the steel ingot to 800°C, hold it for 4 hours, then heat it at 100°C / h to 1200°C, hold it for 2 hours, and pull out the billet.

[0039] b) Heating the workpiece to 1200° C., keeping it warm for 2 hours, and performing elongation-upsetting. The forging ratio of the upsetting and elongation process is 1....

Embodiment 2

[0054] Embodiment 2: the requirement of manufacturing process among the present embodiment is:

[0055] 1. Material selection:

[0056] Choose 24 "square ingot, 3670Kg / support, the chemical composition of this 24 " square ingot should meet the following regulations:

[0057] Trace ≤ C ≤ 0.22%, 0.10% ≤ Si ≤ 0.30%, 1.15% ≤ Mn ≤ 1.60%, Trace ≤ P ≤ 0.015%, Trace ≤ S ≤ 0.012%, 0.50% ≤ Ni ≤ 0.80%, Trace ≤Cr≤0.20%, 0.40%≤Mo≤0.60%, trace ≤V≤0.01%, trace ≤Cu≤0.10%, 0.01%≤Al≤0.04%, trace ≤Co≤0.03%, the balance is Fe and unavoidable impurities.

[0058] 2. Forging:

[0059] Cutting percentage of ingot head and ingot tail: 17% cut head and 8% cut tail of steel ingot.

[0060] f) Heat the steel ingot to 800°C, keep it warm for 4 hours, then heat it at 100°C / h to 1200°C, keep it warm for 2 hours, and pull out the billet.

[0061] g) Heating the workpiece to 1200° C., keeping it warm for 2 hours, and performing elongation-upsetting. The forging ratio of the upsetting and elongation pro...

Embodiment 3

[0076] Embodiment 3: the requirement of manufacturing process among the present embodiment is:

[0077] 1. Material selection:

[0078] Choose 24 "square ingot, 3670Kg / support, the chemical composition of this 24 " square ingot should meet the following regulations:

[0079] Trace ≤ C ≤ 0.22%, 0.10% ≤ Si ≤ 0.30%, 1.15% ≤ Mn ≤ 1.60%, Trace ≤ P ≤ 0.015%, Trace ≤ S ≤ 0.012%, 0.50% ≤ Ni ≤ 0.80%, Trace ≤Cr≤0.20%, 0.40%≤Mo≤0.60%, trace ≤V≤0.01%, trace ≤Cu≤0.10%, 0.01%≤Al≤0.04%, trace ≤Co≤0.03%, the balance is Fe and unavoidable impurities.

[0080] 2. Forging:

[0081] Cutting percentage of ingot head and ingot tail: 17% cut head and 8% cut tail of steel ingot.

[0082] k) Heat the steel ingot to 800°C, keep it warm for 4 hours, then heat it at 100°C / h to 1200°C, keep it warm for 2 hours, and pull out the billet.

[0083] l) Heating the workpiece to 1200° C., keeping it warm for 2 hours, and performing elongation-upsetting. The forging ratio of the upsetting and elongation pro...

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Abstract

The invention relates to the technical field of forging, in particular to a method for forging a bearing support forged piece for a nuclear reactor pressure vessel. The method comprises the following steps: repeatedly performing upsetting-stretching on a suitable steel ingot at the temperature of between 1,200 and 800 DEG C to ensure that the forging ratio is no less than 4; and then sequentially performing heat treatment after forging, rough machining before the heat treatment, property heat treatment and machining after the heat treatment on the steel ingot to obtain the bearing support forge piece. The method has the advantages that: the actual grain size of the bearing support is less than 5; performance indexes of the bearing support forge piece meet requirements of RCC-M and an ASTM standards; using requirements of the bearing support forge piece for the nuclear reactor pressure vessel are met; the safety and the reliability are greatly improved; and technical requirements of the products are met.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a forging method for a bearing support forging used for a reactor pressure vessel of a nuclear power plant. 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, large castings and forgings used in mega-kilowatt nuclear power construction pr...

Claims

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Application Information

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IPC IPC(8): B21K1/00C22C38/58C22C38/52C21D9/00
Inventor 王兴中王元华
Owner 上海新闵重型锻造有限公司
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