A kind of 026cr18ni12mo2n stainless steel forging for nuclear power plant and its manufacturing method

A technology of 026cr18ni12mo2n and a manufacturing method, which is applied in the field of stainless steel forging, can solve the problem that the strength requirements cannot meet the requirements of forgings, etc., and achieve the effect of effectively refining grains and increasing the strength of materials

Active Publication Date: 2021-12-03
无锡市法兰锻造有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The strength requirements of the existing 026Cr18Ni12Mo2N stainless steel cannot meet the requirements of forgings for nuclear power plants, so it is necessary to develop a high-strength 026Cr18Ni12Mo2N stainless steel forgings to meet the requirements of nuclear power plants

Method used

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Embodiment

[0031] The chemical composition of stainless steel forgings is: C is 0.021%, Si is 0.48%, Mn is 1.82%, P is 0.018%, S is 0.008%, Cr is 17.53%, Ni is 11.82%, Mo is 2.53%, N is 0.07 %, Cu is 0.8%, and the rest is pig iron.

[0032] The stainless steel forging is produced by the manufacturing method of the present invention: the raw material is refined into a stainless steel ingot containing the chemical composition in this embodiment by using an AOD furnace. The obtained stainless steel ingots are made into stainless steel forgings with a hydraulic press. The forging is formed through 3 fire times, the forging ratios of the 3 fire times are 2, 2, 1 respectively, and the heating temperatures of the 3 fire times are 1200°C, 1000°C, 800°C respectively. The riser end of the stainless steel ingot is removed by 18%, and the nozzle end of the stainless steel ingot is removed by 7%. The forged stainless steel forging is heated to 1090°C and held for 3.5 hours, and water is cooled by r...

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Abstract

The invention discloses a 026Cr18Ni12Mo2N stainless steel forging for nuclear power plants. The stainless steel forging contains the following chemical components: 0.015%≤C≤0.035%, Si≤1%, Mn≤2%, P≤0.03%, S≤0.015%, 17.2%≤Cr≤18.2%, 11.6%≤Ni≤12.5%, 2.25%≤Mo≤2.75%, 0.05%≤N≤0.08%, Cu≤1%, and the rest is pig iron. A manufacturing method is also disclosed, comprising the following steps: raw material refining; forging: forging the obtained stainless steel ingot into a stainless steel forging, and the stainless steel forging undergoes main deformation at a temperature of 1000°C±20°C; heat treatment: heating the forged stainless steel forging To 1050 ℃ ~ 1120 ℃ and heat preservation, and then water cooling; detection. Through the above method, the present invention increases the content of C and N in terms of chemical composition, adjusts the content of Cr and Ni, and improves the strength of the forging in terms of material composition. In terms of manufacturing methods, the internal stress generated during final forging can also produce static recrystallization during heat treatment, so that the grains of the material can be effectively refined, and the grain refinement can increase the strength of the material.

Description

technical field [0001] The invention relates to the technical field of stainless steel forging, in particular to a 026Cr18Ni12Mo2N stainless steel forging for nuclear power plants and a manufacturing method thereof. Background technique [0002] Austenitic stainless steel refers to stainless steel with austenitic structure at room temperature, and 026Cr18Ni12Mo2N stainless steel is one of austenitic stainless steels. When the steel contains about 18% of Cr and 8% to 25% of Ni, it has a stable austenite structure. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, good machinability, but low strength. [0003] The forgings used in nuclear power plants have high requirements on the strength of 026Cr18Ni12Mo2N stainless steel, which needs to have a certain high strength. The strength requirements of the existing 026Cr18Ni12Mo2N stainless steel cannot meet the requirements of forgings used in nuclear power plants, so it is necessary to develop a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/44C22C38/42C21D8/00
CPCC21D8/005C22C38/001C22C38/02C22C38/04C22C38/42C22C38/44C22C38/58
Inventor 李刚亮吴金波石宏亮邹琪邓冬袁超
Owner 无锡市法兰锻造有限公司
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