TISCO releases patents related to stainless steel plate production methods
CN119265480A-A 301L stainless steel cold hard plate for high-speed trains and its preparation method
On January 7, 2025, Shanxi TISCO Stainless Steel Co., Ltd. successfully applied for a patent named “A 301L stainless steel cold hard plate for high-speed trains and its preparation method”, with application publication number CN119265480A and application date September 13, 2024.
The present invention belongs to the technical field of train metal material preparation, and in particular, relates to a 301L stainless steel cold hard plate for high-speed trains and its preparation method,
including: C≤0.03%, Si: 0.40%~1.00%, Mn≤2.0%, P≤0.045%, S≤0.03%, Cr: 16.00%~18.00%, Ni: 6.00%~8.00%, N: 0.10%~0.20%, Cu≤0.5%, and the rest are Fe and unavoidable impurities.
The preparation method includes the following contents:
(1) adjusting the rolling process: adopting a double rolling process, the first rolling process: the total number of passes is 5-7; the finished rolling process: the total deformation rate of the finished rolling process is designed according to different strength levels;
(2) adjusting the rolling mill parameters: optimizing the taper length and taper of the first intermediate roll, the convexity of the second intermediate roll, and the working roll;
(3) Adjusting the cold line process: The first rolling process cold-rolled strip is subjected to solid solution and pickling treatment, and the finished rolling process cold-hardened strip is subjected to pickling and bending straightening treatment. This method avoids the problems of edge wave plate shape defects and large performance fluctuations.
CN119259706A-A method for producing high-chromium ultra-pure ferritic stainless steel cold-rolled plate without grinding
On January 7, 2025, Shanxi Taigang Stainless Steel Co., Ltd. successfully applied for a patent entitled “A method for producing high-chromium ultra-pure ferritic stainless steel cold-rolled plate without grinding”, the application publication number is CN119259706A, and the application date is September 18, 2024.
The invention discloses a method for producing a grinding-free high-chromium ultra-pure ferrite stainless steel cold-rolled plate, comprising:
raw material annealing and pickling: after the shot blasting process of the raw material annealing and pickling and after the sulfuric acid pickling process, the iron scale on the surface of the raw material is respectively brushed with a heavy brush, the rebrushing speed is controlled to be 500-750rpm, the power is controlled to be 50-70KW, and the reduction ratio is controlled to be ≥20%;
the roughness and deformation of the roller during cold rolling are controlled: in the first pass of cold rolling, the roughness of the roller is 0.8-1.0μm, and the deformation is controlled to be 22-25%;
in the second pass of cold rolling to the pass before the finished product, the roughness of the roller is 0.2-0.4μm, and the deformation is controlled to be 13-20%;
in the finished product pass of cold rolling, the roughness of the roller is 0.1-0.2μm, and the deformation is controlled to be 10-20%. The present invention ensures the surface quality of high-chromium ultra-pure ferritic stainless steel cold-rolled plate, and can omit the grinding process, hot coil grinding-free, improve production efficiency and yield rate, reduce manufacturing costs, and effectively improve product economy and competitiveness.
CN119259735A -A production process for duplex stainless steel seamless steel pipes for heat exchangers
On January 7, 2025, Shanxi Taigang Stainless Steel Co., Ltd. successfully applied for a patent named “A production process for duplex stainless steel seamless steel pipes for heat exchangers”, with the application publication number CN119259735A and the application date September 12, 2024.
A production process for duplex stainless steel seamless steel pipes for high-precision heat exchangers, with a steel grade of 022Cr23Ni5Mo3N, a chemical composition weight percentage of C≤0.03, Si≤1.00, Mn≤2.00, Cr: 22.00~23.00, Ni: 4.50~6.50, Mo: 3.00~3.50, S≤0.03, P≤0.030.
Typical specifications are Φ25.4×1.651, Φ31.75*1.651, Φ38.1*2.
Its manufacturing method is as follows: (1) tube billet manufacturing; (2) hot perforation; (3) cold rolling; (4) heat treatment; (5) straightening; (6) pickling.
The finished tube has room temperature tensile strength ≥655MPa, room temperature yield strength ≥485MPa, elongation after fracture ≥25%, hardness HRC ≤28, uniform structure, ferrite content 45%-55%, thermal conductivity ≥17.6W (m·K)-1 (0℃), pitting corrosion rate <0.01g/m2/24Hrs (25℃, 6% FeCl3 solution, 72h), meeting the requirements of heat exchanger.
Tabs:stainless steel,cold-rolled plate ,stainless steel seamless steel pipes
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