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Method for forging Venturi tubes

A Venturi tube and trace technology, applied in the field of forging, can solve the problems of failure to meet standards, very high performance requirements of forgings, and inability to achieve localization, so as to achieve the effect of improving reliability and meeting technical requirements

Inactive Publication Date: 2010-07-14
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 venturi tubes used in nuclear power plant steam generators, have very high performance requirements for forgings due to their special service environment, and general heat treatment methods cannot meet the standards
At present, the above-mentioned venturi tubes for nuclear power cannot be localized, and most of them are ordered from abroad.

Method used

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  • Method for forging Venturi tubes
  • Method for forging Venturi tubes
  • Method for forging Venturi tubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: The requirements of the manufacturing process in this embodiment are:

[0026] 1. Material selection:

[0027] Choose φ360 electroslag remelting ingot, 890Kg / stick, the chemical composition of the φ360 electroslag remelting ingot should meet the following requirements:

[0028] Trace ≤C≤0.10%, trace ≤Si≤0.50%, trace ≤Mn≤1.00%, trace ≤P≤0.015%, trace ≤S≤0.010%, 14%≤Cr≤17%, Ni≥ 72%, 6%≤Fe≤10%, trace quantity≤B≤0.0018%, trace quantity≤Cu≤0.50%, trace quantity≤Al≤0.50%, trace quantity≤Ti≤0.50%, the balance is unavoidable impurities

[0029] 2. Forging:

[0030] Removal percentage of ingot head and tail: 6% of steel ingot head and 9% of tail.

[0031] 1) Heat the steel ingot to 450°C for 2 hours; then heat it for 6 hours to reach a temperature of 950°C and hold it for 2 hours; then heat it for 3 hours to make its temperature reach 1130°C, hold it for 2 hours, and pull out the billet.

[0032] 2) In the temperature range of 1130℃-850℃, the workpiece produced in step b) is ...

Embodiment 2

[0040] Embodiment 2: The requirements of the manufacturing process in this embodiment are:

[0041] 1. Material selection:

[0042] Choose φ360 electroslag remelting ingot, 890Kg / stick, the chemical composition of the φ360 electroslag remelting ingot should meet the following requirements:

[0043] Trace ≤C≤0.10%, trace ≤Si≤0.50%, trace ≤Mn≤1.00%, trace ≤P≤0.015%, trace ≤S≤0.010%, 14%≤Cr≤17%, Ni≥ 72%, 6%≤Fe≤10%, trace quantity≤B≤0.0018%, trace quantity≤Cu≤0.50%, trace quantity≤Al≤0.50%, trace quantity≤Ti≤0.50%, the balance is unavoidable impurities

[0044] 2. Forging:

[0045] Removal percentage of ingot head and tail: 6% of steel ingot head and 9% of tail.

[0046] 1) Heat the steel ingot to 450°C for 2 hours; then heat it for 6 hours to reach a temperature of 950°C and hold it for 2 hours; then heat it for 3 hours to make its temperature reach 1130°C, hold it for 2 hours, and pull out the billet.

[0047] 2) In the temperature range of 1130℃-850℃, the workpiece produced in step b) is ...

Embodiment 3

[0055] Embodiment 3: The requirements of the manufacturing process in this embodiment are:

[0056] 1. Material selection:

[0057] Choose φ360 electroslag remelting ingot, 890Kg / stick, the chemical composition of the φ360 electroslag remelting ingot should meet the following requirements:

[0058] Trace ≤C≤0.10%, trace ≤Si≤0.50%, trace ≤Mn≤1.00%, trace ≤P≤0.015%, trace ≤S≤0.010%, 14%≤Cr≤17%, Ni≥ 72%, 6%≤Fe≤10%, trace quantity≤B≤0.0018%, trace quantity≤Cu≤0.50%, trace quantity≤Al≤0.50%, trace quantity≤Ti≤0.50%, the balance is unavoidable impurities

[0059] 2. Forging:

[0060] Removal percentage of ingot head and tail: 6% of steel ingot head and 9% of tail.

[0061] 1) Heat the steel ingot to 450°C for 2 hours; then heat it for 6 hours to reach a temperature of 950°C and hold it for 2 hours; then heat it for 3 hours to make its temperature reach 1130°C, hold it for 2 hours, and pull out the billet.

[0062] 2) In the temperature range of 1130℃-850℃, the workpiece produced in step b) is ...

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Abstract

The invention relates to the technical field of forging, in particular to a method for forging Venturi tubes for steam generators in nuclear power plants. The method specifically comprises the following steps: selecting proper steel ingots, repeatedly upsetting-drawing out the steel ingots to ensure the forging ratio to be not less than 4 in the temperature range of 1130-850 DEG C; and then carrying out rough machining, property heat treatment and machining in sequence to obtain the Venturi tubes. The invention has the following advantages: various property indexes of the Venturi tubes meet the standard requirements of RCC-M, thus ensuring the use requirements of the Venturi tubes, greatly elevating the safety and reliability of the Venturi tubes and meeting the technical requirements of the Venturi tubes.

Description

Technical field [0001] The invention relates to the technical field of forging, in particular to a method for forging a venturi tube used in a steam generator of a nuclear power plant. Background technique [0002] In recent years, the 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 the 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 focused 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 venturi tube...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C38/54B21J1/06B21K1/14C21D9/00
Inventor 王兴中王元华
Owner 上海新闵重型锻造有限公司
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