A high-n austenitic stainless steel plate with excellent performance and its manufacturing method

Abstract

The invention discloses an excellent-performance high-N austenitic stainless steel medium-thick plate and a manufacturing method thereof. The continuous casting slab medium axialite ratio is higher than or equal to 80%; the casting blank surface roughness is smaller than or equal to 100 microns; the casting blank preheating section temperature is 980 DEG C to 1100 DEG C, the heating section temperature is 1160 DEG C to 1230 DEG C, the soaking section temperature is 1200 DEG C to 1230 DEG C, and the in-furnace time is 3 h-4 h; the rough rolling starting temperature is higher than or equal to 1150 DEG C, the first-two gate rolling reduction rate is higher than or equal to 20%, the rough rolling follow-up gate reduction rate is smaller than or equal to 15%, and the intermediate blank thickness is 80 mm to 120 mm; the finish rolling start temperature is higher than or equal to 1050 DEG C, the final rolling temperature is higher than or equal to 950 DEG C, and the rolling reduction rate issmaller than or equal to 20%; and the solution temperature is 980 DEG C to 1050 DEG C, and the in-furnace time is 2 min / mm to 5 min / mm. The product width is 2200 mm to 4000 mm, and the product thickness is 30 mm to 60 mm. The -196 DEG C yield strength is larger than or equal to 350 MPa, the tensile strength is larger than or equal to 1250 MPa, the elongation is larger than or equal to 40%, and thesurface crack rejection rate drops from more than 15% to less than 5%.

Description

technical field [0001] The invention relates to the technical field of austenitic stainless steel plate rolling, in particular to a hot-rolled austenitic stainless steel plate with high strength and high toughness and a manufacturing method thereof. The austenitic stainless steel plate is mainly suitable for use in Structural components with high toughness and high strength subject to impact loads, such as wind tunnel mechanical systems, power station steam-water separators, steam turbine plates and nuclear power safety equipment for large-scale aviation and aerospace equipment in the country. Background technique [0002] With the rapid development of domestic wind tunnel laboratory construction for large aircraft experiments, water vapor pressure vessels, nuclear power safety equipment, shipbuilding industry and other industries in recent years, the medium thickness of austenitic stainless steel with high low temperature tensile strength and high toughness The demand for p...

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Problems solved by technology

The method adopts the optimization of the electromagnetic stirring process in the continuous casting stage, the surface grinding of the slab and the spraying of anti-oxidation coatings, and the control of process parameters such as the high-pressure water descaling process and the deformation amount of the rough rolling stage and the finishing rolling stage. The final preparation width is 2200-4000mm, high-N austenitic stainless steel plate with a thickness of 30-60mm solves the problem that high-N austenitic stainless steel plate is prone to edge cracks and surface cracks, and the scrap rate of surface cracks is reduced from 15% at the initial stage above, and reduced to below 5%, the average mechanical properties of the steel plate at room temperature are: yield strength ≥ 250MPa, tensile strength ≥ 560MPa, elongation ≥ 50%; mechanical properties at -196°C are: yield strength ≥ 350MPa, tensile strength ≥ 1250MPa, elongation ≥ 40%

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