Forging method of water supply connecting tube and secondary side manhole

A secondary side and water supply technology, applied in the field of forging, can solve problems such as failure to meet standards, very high performance requirements for forgings, and inability to achieve localization, etc., to achieve the effect of meeting technical requirements and improving reliability

Active Publication Date: 2010-06-23
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, the large castings and forgings used in mega-kilowatt nuclear power construction projects, such as evaporator generator water supply pipes and secondary side manholes, have very high performance requirements for forgings due to their special service environment. General heat treatment Method handling not up to par
At present, the above-mentioned water supply pipes and secondary side manholes cannot be localized, and most of them are ordered from abroad.

Method used

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  • Forging method of water supply connecting tube and secondary side manhole
  • Forging method of water supply connecting tube and secondary side manhole
  • Forging method of water supply connecting tube and secondary side manhole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the requirement of manufacturing process among the present embodiment is:

[0027] 1. Material selection:

[0028] Choose 22" square ingot for forging secondary side manhole; choose 28" octagonal ingot for forging water supply connection, the chemical composition of the 22" square ingot and 28" octagonal ingot should meet the following requirements:

[0029] Trace ≤ C ≤ 0.20%, 0.10% ≤ Si ≤ 0.30%, 1.15% ≤ Mn ≤ 1.60%, Trace ≤ P ≤ 0.012%, Trace ≤ S ≤ 0.012%, Trace ≤ Cr ≤ 0.25%, 0.50% ≤Ni≤0.80%, 0.45%≤Mo≤0.55%, trace ≤V≤0.03%, trace ≤Cu≤0.20%, 0.01%≤Al≤0.04%, 0≤H≤0.00008%, the balance is Fe and unavoidable impurities.

[0030] 2. Forging:

[0031] Cutting percentage of head and tail: 15% head cut and 10% tail cut for 28″ octagonal ingot; 13% head cut and 10% tail cut for 22″ square ingot.

[0032] a) heating the steel ingot to 600°C and keeping it for 3 hours; then heating for 4 hours to make the temperature reach 800°C and keeping it for 3 hours; then hea...

Embodiment 2

[0045] Embodiment 2: the requirement of manufacturing process among the present embodiment is:

[0046] 1. Material selection:

[0047] Choose 22" square ingot for forging secondary side manhole; choose 28" octagonal ingot for forging water supply connection, the chemical composition of the 22" square ingot and 28" octagonal ingot should meet the following requirements:

[0048] Trace ≤ C ≤ 0.20%, 0.10% ≤ Si ≤ 0.30%, 1.15% ≤ Mn ≤ 1.60%, Trace ≤ P ≤ 0.012%, Trace ≤ S ≤ 0.012%, Trace ≤ Cr ≤ 0.25%, 0.50% ≤Ni≤0.80%, 0.45%≤Mo≤0.55%, trace ≤V≤0.03%, trace ≤Cu≤0.20%, 0.01%≤Al≤0.04%, 0≤H≤0.00008%, the balance is Fe and unavoidable impurities.

[0049] 2. Forging:

[0050] Cutting percentage of head and tail: 15% head cut and 10% tail cut for 28″ octagonal ingot; 13% head cut and 10% tail cut for 22″ square ingot.

[0051] a) heating the steel ingot to 600°C and keeping it for 3 hours; then heating for 4 hours to make the temperature reach 800°C and keeping it for 3 hours; then hea...

Embodiment 3

[0064] Embodiment 3: the requirement of manufacturing process among the present embodiment is:

[0065] 1. Material selection:

[0066] Choose 22" square ingot for forging secondary side manhole; choose 28" octagonal ingot for forging water supply connection, the chemical composition of the 22" square ingot and 28" octagonal ingot should meet the following requirements:

[0067] Trace ≤ C ≤ 0.20%, 0.10% ≤ Si ≤ 0.30%, 1.15% ≤ Mn ≤ 1.60%, Trace ≤ P ≤ 0.012%, Trace ≤ S ≤ 0.012%, Trace ≤ Cr ≤ 0.25%, 0.50% ≤Ni≤0.80%, 0.45%≤Mo≤0.55%, trace ≤V≤0.03%, trace ≤Cu≤0.20%, 0.01%≤Al≤0.04%, 0≤H≤0.00008%, the balance is Fe and unavoidable impurities.

[0068] 2. Forging:

[0069] Cutting percentage of head and tail: 15% head cut and 10% tail cut for 28″ octagonal ingot; 13% head cut and 10% tail cut for 22″ square ingot.

[0070] a) heating the steel ingot to 600°C and keeping it for 3 hours; then heating for 4 hours to make the temperature reach 800°C and keeping it for 3 hours; then hea...

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Abstract

The invention relates to the technical field of forging, in particular to a forging method of a water supply connecting tube and a secondary side manhole for an evaporator generator in a nuclear power station, which comprises the following steps: selecting a suitable steel ingot, wherein within a temperature range of 1180 DEG C-800 DEG C, the steel ingot is repeatedly upset and stretched so that the forging ratio is not less than 4; and then sequentially carrying out heat treatment after forging, rough machining before heat treatment, performance heat treatment and machining after heat treatment to obtain the water supply connecting tube and the secondary side manhole. The invention has the advantages that the actual grain size of the water supply connecting tube and the secondary side manhole manufactured by the invention is less than or equal to level 5, all performance indices meet the standard requirements of RCC-M and ASTM, the operating requirements of the water supply connecting tube and the secondary side manhole for the evaporator generator in the nuclear power station are ensured, the safety and reliability are greatly improved, and the technical requirement of the products is met.

Description

technical field [0001] The invention relates to the field of forging technology, in particular to a forging method for a water supply connection pipe of a generator of an evaporator of a nuclear power plant and a secondary side manhole. 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, the large castings and forgings used in mega-ki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C38/58C22C38/46B21K1/14F22B37/02
Inventor 王兴中王元华
Owner 上海新闵重型锻造有限公司
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