Preparation method of heat-resistant stainless steel

A heat-resistant stainless steel, molten steel smelting technology, applied in the direction of reducing gas emissions, can solve the problems of surface quality, production stability and product service life gap, achieve excellent processability, achieve economic maximization effect, and ensure pickling quality. Effect

Active Publication Date: 2020-04-24
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the domestic market is mainly EN1.4828 stainless steel imported from South Africa. The known and public technology of this stainless steel is only the range of component values. In China, only Taiyuan Iron and Steel and Baosteel have a small amount of test production, but the surface quality, production stability and product use There is a big gap between the service life and EN1.4828 stainless steel

Method used

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  • Preparation method of heat-resistant stainless steel
  • Preparation method of heat-resistant stainless steel
  • Preparation method of heat-resistant stainless steel

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Effect test

Embodiment 1

[0019] A method for preparing heat-resistant stainless steel, which is characterized by comprising the following steps: the raw materials of the heat-resistant stainless steel include: C: 0.04%, Si: 1.9%, Mn: 1.25%, P: ≤0.03% , S: ≤0.01%, Cr: 19.2%, Ni: 11.4%, N: 0.05%, the rest is Fe and unavoidable impurities; the service temperature of the heat-resistant stainless steel is ≤1000°C; the heat-resistant stainless steel Each raw material is subjected to molten steel smelting, annealing and pickling steps;

[0020] The molten steel smelting steps include: EAF electric furnace raw material input stage control, raw material ratio is STS + ordinary carbon steel + ChCr + pure NI, to ensure P≤0.025%; AOD argon oxygen decarburization refining; pre-desulfurization molten soup desulfurization process; continuous casting The process uses CaO-SiO 2 It is molten steel with low melting point steel slag; adopts Si+Al deoxidation technology; the refining process adopts complete slag removal ...

Embodiment 2

[0053] On the basis of the composition of the above heat-resistant stainless steel raw materials, the raw materials of heat-resistant stainless steel may also include: C: 0.02-0.06%, Si: 1.6-2.0%, Mn: 1.0-1.5%, P: ≤ 0.035%, S: ≤0.001%, Cr: 19.0-20.0%, Ni: 11.0-12.0%, N: ≤0.06%, and the rest are Fe and unavoidable impurities.

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Abstract

The invention discloses a preparation method of heat-resistant stainless steel. The preparation method comprises the following steps that raw materials of the heat-resistant stainless steel are subjected to molten steel smelting and annealing pickling. The molten steel smelting step comprises EAF electric furnace raw material feed stage arrangement and control are carried out, and the raw materialratio is STS + plain carbon steel + ChCr + pure NI; AOD argon oxygen decarburization refining is carried out; a pre-desulfurization molten liquid desulfurization process is adopted; CaO-SiO2 series low-melting-point steel slag molten steel is adopted in a continuous casting process; a Si + Al deoxidation technology is adopted; complete slagging-off operation is adopted in the refining process, the aeration time is 12 min, and the standing time is longer than 30 min; and an air curtain retaining wall is added to a tundish. The annealing pickling step comprises a neutral salt electrolysis section and a mixed acid pickling section. The method has the beneficial effects that through the reasonable design of the components and the determination of the production process, the heat-resistant stainless steel with excellent heat fatigue resistance, high-temperature strength and oxidation resistance is obtained, and the good economic and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of stainless steel smelting, and in particular relates to a preparation method of heat-resistant stainless steel. Background technique [0002] In recent years, people have been paying more and more attention to the environmental friendliness of the earth. In order to adapt to the international trend of resource conservation and environmental friendliness, higher requirements have been put forward for engine exhaust system components: on the one hand, it is to improve thermal efficiency and reduce exhaust emissions On the other hand, it is to reduce the weight of the car itself and increase the driving speed. With the increasingly severe environmental pressure, from 2001 to 2019, China's national automobile exhaust emission standards gradually rose from National I to VI, and the automobile exhaust emission standards became more stringent. Emission requirements are higher. The hot end of automobile exhaust ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/04C22C38/34C22C38/40C23G1/08C21C7/064C21C7/072
CPCC21C7/064C21C7/072C22C33/04C22C38/001C22C38/04C22C38/34C22C38/40C23G1/08Y02P10/134
Inventor 吴正华黄锦锋吴辉
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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