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Forging method for martensitic stainless steel pressure springs of nuclear power equipment reactor internals

A martensitic stainless steel, compression spring technology, applied in mechanical equipment, engine components, etc., can solve the problems of short forging time, narrow forging temperature range, and difficult forging.

Active Publication Date: 2015-04-22
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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Problems solved by technology

[0003] Martensitic stainless steel is used for the compression spring forgings of nuclear power reactor internal components, and its manufacturing difficulties are mainly as follows: 1. The material has high strength and hardness and is not easy to forge; 2. The forging temperature range is narrow, and the forging time is relatively short; 3. When forging , easy to crack; 4. The roundness is not easy to control during forging

Method used

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  • Forging method for martensitic stainless steel pressure springs of nuclear power equipment reactor internals
  • Forging method for martensitic stainless steel pressure springs of nuclear power equipment reactor internals
  • Forging method for martensitic stainless steel pressure springs of nuclear power equipment reactor internals

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Embodiment Construction

[0022] Such as image 3 Shown, the forging forming method of the martensitic stainless steel compression spring of nuclear power equipment internal component of the present invention, with as figure 1 The 17-21 tons of electroslag ingot shown is used as the raw material, the diameter of the electroslag ingot is Φ1300-1500mm, and the length is 1630-2020mm, including the following steps:

[0023] The first step is to elongate;

[0024] Heat the electroslag ingot to 1200±10°C and keep it warm; use a 28MN hydraulic press to elongate it to Φ1100mm; then cut off the bottom and riser, the cutting ratio is ≥3%; the forging ratio is ≥1.4;

[0025] The second step is upsetting and punching;

[0026] Return to the furnace and heat to 1200±10°C, keep warm; use a 165MN hydraulic press to upset the circular backing plate; then use a Φ650mm hollow punch to punch holes on the drain plate; forging ratio ≥ 4.3;

[0027] The third step is to ream the hole once; return to the furnace and heat ...

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Abstract

The invention discloses a forging method for martensitic stainless steel pressure springs of nuclear power equipment reactor internals. 17-21 tons of electroslag ingots are used as raw materials, the diameter of each electroslag ingot is phi 1300-1500mm, and the length of each electroslag ingot is 1630-2020mm. The forging method includes the steps: firstly, drawing each electroslag ingot to reach phi 1100mm by using a 28MN hydraulic press; secondly, heading by using a 165MN hydraulic press and then punching by using a hollow punch of phi 650mm; thirdly, primarily chambering a mandrel of phi 600mm to reach phi 1600mm by using the 165MN hydraulic press; and fourthly, secondarily chambering the mandrel of phi 1200mm to reach phi 2900-3200mm by using the 165MN hydraulic press. The forging method can be used for effectively solving the problem of difficulties in manufacturing the pressure springs, and all-round performances of the manufactured pressure springs meet requirements.

Description

technical field [0001] The invention relates to a forging forming method of nuclear power equipment, in particular to a forging forming method of a martensitic stainless steel compression spring of an internal component of the nuclear power equipment. Background technique [0002] As a clean energy source, nuclear power is more and more popular, but the safety of nuclear power is the most concerned issue, and the quality of the parts that make up the nuclear power plant is the guarantee of the safety of the nuclear power plant. The compression spring is the main part of the internal components of the main equipment of the nuclear island of the nuclear power plant, and the requirements for its various performances are particularly high. [0003] Martensitic stainless steel is used for the compression spring forgings of nuclear power reactor internal components, and its manufacturing difficulties are mainly as follows: 1. The material has high strength and hardness and is not ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21K1/76
Inventor 张灵芳陈永波凌进叶志强乔志洲张华
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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