Z2CND18-12N control nitrogen stainless steel forging technology

A stainless steel and process technology, applied in the field of nitrogen-controlled stainless steel forging process, can solve the problems of not meeting the requirements, difficult to improve, unstable actual indicators, etc., and achieve the effect of long service life, reliable and safe performance

Active Publication Date: 2012-07-25
无锡市法兰锻造有限公司
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

The actual indicators of the existing Z2CND18-12N domestic forgings are very unstable, and most of them fail to meet the requirements, and it is difficult to improve even through re-heat treatment

Method used

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Examples

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Embodiment Construction

[0007] An embodiment of the present invention, Z2CND18-12N nitrogen-controlled stainless steel forging process, includes raw material control, heating forging and heat treatment steps, wherein heating forging includes forging blank heating process and forging deformation process.

[0008] The technique of the present invention mainly takes measures in three aspects, so that the strength of its product reaches more than 460MPa at 350°C:

[0009] 1. Quality control of raw materials. The quality of raw materials is the basic factor that determines the performance of forgings, including reasonable chemical composition, the lowest possible impurity content, and smelting methods.

[0010] Control the chemical composition of the raw material Z2CND18-12N nitrogen-controlling stainless steel material, the standard value of c content of the raw material is ≤0.035%, in order to improve the strength, increase the lower limit content, control it at 0.02%-0.35%; the standard value of Si con...

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Abstract

The invention provides a Z2CND18-12N control nitrogen stainless steel forging technology relates to the processing method of stainless steel material. The invention uses raw materials controlling chemical compositions and selects lower solid solution treatment temperature through three-section temperature rise method and heat treatment. The temperature rise speed in the heat treatment is not greater than 150 degrees centigrade and the heat holding time is calculated according to 1.5min/mm and not less than 2.5h. The Z2CND18-12N control nitrogen stainless steel forging material processed by the method of the invention has strength above 460Mpa stably at high temperature of 350 DEG C to meet the component manufacturing requirements of nuclear power industry. The processing method is applied for manufacturing important components such as nuclear power pipe flange.

Description

technical field [0001] The invention relates to a forging process of stainless steel, in particular to a forging process of a nitrogen-controlled stainless steel marked Z2CND18-12N. Background technique [0002] Z2CND18-12N is a nitrogen-controlled austenitic stainless steel material. It is graded according to the NF standard steel grade and is widely used in the nuclear power industry. For example, in nuclear power pipelines, most flanges are made of this material. In general end use, a certain forging process is required, and the technical requirement after forging is that the tensile strength at a high temperature of 350°C should reach more than 445MPa. Due to the backwardness of my country's basic material science, it is difficult for domestically produced materials to meet the requirements. For example, for the same grade of steel, imported materials can meet the performance requirements, but materials produced by domestic steel mills cannot meet the requirements. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00C22C38/58
Inventor 邹上元
Owner 无锡市法兰锻造有限公司
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