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High-nitrogen austenitic stainless steel new material for roof and preparation method of new material
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A technology of austenitic stainless steel and high-nitrogen austenite, applied in the field of new high-nitrogen austenitic stainless steel materials for roofing and its preparation, can solve the problems of general corrosion resistance, low stainless steel strength, and high cost, and achieve corrosion resistance Good performance, high cost performance, good plastic effect
Inactive Publication Date: 2020-05-05
连云港华乐不锈钢制品有限公司
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304 austenitic stainless steel has good corrosion resistance and good processing performance, but high nickel content and high cost
Nickel is a precious metal, and there are not many reserves in my country. The large-scale use of nickel will greatly increase the cost
430 ferritic stainless steel has low strength and general corrosion resistance, so it is difficult to meet the requirements
In fact, in the industrial mass production mode, it is not yet possible to stably produce products with a N content higher than 1.0%
Therefore, the production of high nitrogen steel is still basically in the laboratory or pilot stage, and the size is limited
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Embodiment 2
[0083] A new type of high-nitrogen austenitic stainless steel for roof panels, its chemical composition is: C: 0.12%, Si: 0.56%, Mn: 9.60%, P: 0.032%, S: 0.006%, Cr: 19.10%, Ni: 1.02%, Mo: 0.04%, Cu: 1.05%, N: 0.306%, the rest is Fe and unavoidable miscellaneous elements; its Md30 / 50: -85.79.
[0084] A method for producing high-nitrogen austenitic stainless steel for a novel roof panel, comprising the following steps:
[0085] (1) The blast furnace molten iron is mixed into AOD, and the AOD furnace blows oxygen to decarburize, adjust the C content to the target range, and initially adjust the Si, Mn, P, S, Cr, Ni, N content.
[0086] (2) LF process: further deoxidize the molten steel produced in the AOD process, and control the oxygen content to ≤30ppm. In the later stage of refining, a 100m silicon-calcium wire is added, and argon is blown softly for 20 minutes for continuous casting.
[0087] (3) Continuous casting process: control the superheat at 25°C for continuous ste...
Embodiment 3
[0093] A new type of high-nitrogen austenitic stainless steel for roof panels, its chemical composition is: C: 0.09%, Si: 0.54%, Mn: 9.62%, P: 0.035%, S: 0.004%, Cr: 19.20%, Ni: 1.03%, Mo: 0.03%, Cu: 1.10%, N: 0.315%, the rest is Fe and unavoidable miscellaneous elements; its Md30 / 50: -78.64.
[0094] A method for producing high-nitrogen austenitic stainless steel for a novel roof panel, comprising the following steps:
[0095] (1) The blast furnace molten iron is mixed into AOD, and the AOD furnace blows oxygen to decarburize, adjust the C content to the target range, and initially adjust the Si, Mn, P, S, Cr, Ni, N content.
[0096] (2) LF process: further deoxidize the molten steel produced in the AOD process, and control the oxygen content to ≤25ppm. In the later stage of refining, a 120m silicon-calcium wire is added, and argon is blown softly for 25 minutes for continuous casting.
[0097] (3) Continuous casting process: control the superheat at 30°C for continuous ste...
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Abstract
The invention discloses a high-nitrogenaustenitic stainless steel new material for a roof and a preparation method of the new material. Main chemical components of a stainless steel finished productcomprise not larger than 0.16% of C, not larger than 1.0% of Si, 8.00%-12.00% of Mn, not larger than 0.050% of P, not larger than 0.020% of S, 17.00%-20.00% of Cr, 0.50%-1.50% of Ni, not larger than 0.60% of Mo, 0.50%-1.50% of Cu, 0.10%-0.50% of N and the balance iron and inevitable impurity element. According to the high-nitrogenaustenitic stainless steel new material, yield strength is larger than or equal to 400 Mpa, the strength of extension is larger than or equal to 800 Mpa, and the austenitic stainless steel can be used for processed into decoration and roof tiles high in yield strength and toughness, nonmagnetic and capable of being well matched and used in the field. The advantages of being high in strength, good in plasticity, nonmagnetic, high in cost performance, good in corrosion resistance and the like are achieved.
Description
technical field [0001] The invention relates to the technical field of stainless steel production, in particular to a new high-nitrogen austenitic stainless steel material for roofing and a preparation method thereof. Background technique [0002] Wall and roof materials for steel structure enclosure systems are widely made of carbon steel substrate coating materials. Due to the poor corrosion resistance of carbon steel substrate color-coated plates, the use effect is not satisfactory. At present, stainless steel roof tiles are booming. [0003] Among the types of stainless steel materials, the materials include austenitic stainless steel, ferritic stainless steel and duplex stainless steel. Ferritic stainless steel has low strength, and the strength performance of the material is not good, so it has high requirements for production and transportation. Although duplex stainless steel has excellent performance, it is difficult to be widely used due to the difficult productio...
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