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An online solid solution treatment process for austenitic stainless steel plates

A technology of austenitic stainless steel and solid solution treatment, which is applied in the field of stainless steel heat treatment production process, can solve the problems of environmental pollution, large energy consumption, etc., and achieve the effects of reducing production costs, improving corrosion resistance, and shortening the production and manufacturing cycle

Active Publication Date: 2022-01-28
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

The heating process of the off-line solution treatment process consumes a lot of energy and emits CO 2 and other harmful gases, polluting the environment

Method used

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  • An online solid solution treatment process for austenitic stainless steel plates
  • An online solid solution treatment process for austenitic stainless steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] (1) 304 austenitic stainless steel continuous casting slabs with dimensions of 180mm×1536mm (thickness×width) were heated to 1250°C in a heating furnace, held for 2.5 hours and released;

[0027] (2) The continuous casting slab coming out of the heating furnace is rolled after dephosphorization by high-pressure water. The starting temperature is about 1220°C. The rough rolling mill reciprocates rolling for 5 passes, and the thickness of the intermediate slab at the exit of the rough rolling is 26.0mm; The rolling mill rolls 1 pass, rolling the intermediate billet to the thickness of the finished product, the finished product size is 20.0mm×1535mm (thickness×width), and the final rolling temperature is about 1030°C;

[0028] (3) The rolled steel plate slowly swings for 150s on the roller table before and after the finishing mill, so that the steel plate that has been work-hardened after rolling deformation is fully softened;

[0029] (4) The softened stainless steel plat...

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Abstract

The invention belongs to the field of stainless steel heat treatment production technology, and relates to an online solid solution treatment technology for austenitic stainless steel plates. Its main production process is: continuous casting slab heating→high pressure water phosphorus removal→rough rolling→finish rolling→softening treatment→ultra-rapid cooling→straightening→cutting to length→shot peening→pickling. The process of the invention makes full use of the residual heat of rolling without reheating the steel plate from room temperature to the solution temperature. Compared with the conventional steel plate rolling process, in this process, the steel plate needs to be softened after rolling to ensure that the deformed austenite is fully softened before cooling. After softening treatment, ultra-rapid cooling is performed to cool the steel plate from above 800°C to below 430°C, so as to prevent the corrosion resistance of stainless steel from being depleted of intergranular chromium due to the large amount of precipitation of high-chromium carbides.

Description

technical field [0001] The invention belongs to the field of stainless steel heat treatment production technology, and in particular relates to a solid solution treatment technology for austenitic stainless steel plates that makes full use of rolling waste heat, saves energy and reduces emissions, and is green. Background technique [0002] my country's crude steel production ranks first in the world for a long time, but there is still a gap compared with the world's advanced steel-producing countries, mainly in terms of high carbon emissions and energy consumption per ton of steel, and unreasonable product structure. my country's iron and steel industry CO 2 Emissions account for more than 15% of the country's total emissions, and my country's iron and steel enterprises will be under enormous pressure to reduce emissions for a long time. In the face of the increasingly competitive world steel industry, China's steel industry must constantly adapt to the needs of green, int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C21D1/18
CPCC21D8/0226C21D1/18C21D2211/001
Inventor 李海军韩毅付天亮李家栋李勇王昭东
Owner NORTHEASTERN UNIV LIAONING
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