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A heat treatment process for ferritic stainless steel

A stainless steel and ferrite technology, applied in the field of heat treatment of ferritic stainless steel, can solve the problems of easy cracking, poor toughness, poor plasticity, and low mechanical properties of castings, and achieve the advantages of reducing hardness, increasing toughness, and eliminating carbides. Effect

Active Publication Date: 2020-04-14
鹰普(中国)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The mechanical properties of the material are low, especially the toughness and plasticity are poor, and the castings are easily cracked to produce waste products;

Method used

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  • A heat treatment process for ferritic stainless steel
  • A heat treatment process for ferritic stainless steel
  • A heat treatment process for ferritic stainless steel

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Experimental program
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Effect test

Embodiment Construction

[0015] A heat treatment process for ferritic stainless steel, which includes two annealing operations, the specific steps are as follows:

[0016] (1) Anneal the material to be annealed at 900°C for 2 hours, and then air-cool to room temperature;

[0017] (2) Anneal the material cooled to room temperature at 850°C for 2 hours, and then air-cool to room temperature.

[0018] A new exhaust pipe product, the material is 1.4740W, ferritic stainless steel, the composition and performance requirements are as follows figure 1 shown.

[0019] Similar material 1.4740, corresponding to material standard EN 10295, requires annealing, heat treatment temperature is 800°C-850°C, ≤HB300. As-cast mechanical properties: body hardness HB421, test rod tensile 681MPa, yield 586, elongation 0%, its metallographic appearance is as follows figure 2 shown.

[0020] If the annealing temperature is 850°C alone, heat for 2 hours, and then air-cooled, the mechanical properties: hardness HB385, tensi...

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Abstract

The invention provides a heat treatment process of ferrite stainless steel. The ferrite stainless steel subjected to heat treatment through the heat treatment process meets the hardness and elongation requirements. The heat treatment process comprises two times of annealing operation and comprises the specific steps that (1) a material needing to be annealed is annealed at the temperature of 900 DEG C for two hours and then air-cooled to the indoor temperature; and (2) the material cooled to the indoor temperature is annealed at the temperature of 850 DEG C for two hours and then air-cooled to the indoor temperature.

Description

technical field [0001] The invention relates to the field of stainless steel heat treatment technology, in particular to a heat treatment technology of ferritic stainless steel. Background technique [0002] Ferritic stainless steel is an important stainless steel among the five major types of stainless steel. In recent years, the production and consumption at home and abroad are second only to austenitic stainless steel. Ferritic stainless steel has good stainless and comprehensive corrosion properties, and its resistance to pitting corrosion, crevice corrosion, and chloride corrosion is excellent. Its thermal conductivity is 130%-150% of austenitic steel, and its expansion coefficient is 60%-70% of austenitic steel shows good heat resistance. Ferritic stainless steel does not contain nickel and contains a small amount of nickel. It is called nickel-saving steel, so the production cost is much lower than that of austenitic steel. . Although ferritic stainless steel has ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26
CPCC21D1/26C21D2211/005
Inventor 安述麟颜宏班景江
Owner 鹰普(中国)有限公司