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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 methodïŒ
On January 7, 2025, Shanxi TISCO Stainless Steel Co., Ltd. successfully applied for a patent named âA 301L stainless steel cold hard plate for high-speed trains and its preparation methodâ, 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: Câ€0.03%, Si: 0.40%~1.00%, Mnâ€2.0%, Pâ€0.045%, Sâ€0.03%, Cr: 16.00%~18.00%, Ni: 6.00%~8.00%, N: 0.10%~0.20%, Cuâ€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 âA method for producing high-chromium ultra-pure ferritic stainless steel cold-rolled plate without grindingâ, 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 â„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 0.8-1.0ÎŒm, 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 0.2-0.4ÎŒm, and the deformation is controlled to be 13-20%;
in the finished product pass of cold rolling, the roughness of the roller is 0.1-0.2ÎŒm, 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 exchangersïŒ
On January 7, 2025, Shanxi Taigang Stainless Steel Co., Ltd. successfully applied for a patent named âA production process for duplex stainless steel seamless steel pipes for heat exchangersâ, 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 Câ€0.03, Siâ€1.00, Mnâ€2.00, Cr: 22.00~23.00, Ni: 4.50~6.50, Mo: 3.00~3.50, Sâ€0.03, Pâ€0.030.
Typical specifications are Ί25.4Ă1.651, Ί31.75*1.651, Ί38.1*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 â„655MPa, room temperature yield strength â„485MPa, elongation after fracture â„25%, hardness HRC â€28, uniform structure, ferrite content 45%-55%, thermal conductivity â„17.6W (m·K)-1 (0â), pitting corrosion rate <0.01g/m2/24Hrs (25â, 6% FeCl3 solution, 72h), meeting the requirements of heat exchanger.
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17-7 Stainless Steel vs 17-4 â Whatâs the Difference
What is 17-7 Stainless Steel?
17-7PH / 631 Austenite-martensite precipitation hardening stainless steel
17-7PH is a registered trademark of AK Steel in the United States, that is, 631 stainless steel.
631 is an austenite-martensite precipitation hardening stainless steel developed based on 18-8CrNi, also known as controlled phase transformation stainless steel.
After solution treatment, it is an unstable austenite structure with good plasticity and processability.
This state is the use state of steel and has good medium-temperature mechanical properties. The corrosion resistance is better than that of general martensitic stainless steel.
The characteristics of 17-7PH alloy are that it can be heat-treated to obtain high hardness and high strength, excellent fatigue resistance, good corrosion resistance, and small heat treatment deformation.
What is 17-4 Stainless Steel?
17-4 PH is a registered trademark of AK Steel in the United States, that is, 630 precipitation hardening martensitic stainless steel. The alloy is characterized by high strength and good corrosion resistance, and the recommended operating temperature is below 300â.
630 is a hardenable stainless steel. Through different heat treatments, different hardness can be obtained, and its tensile strength can reach up to 1100~1300MPa.
Among all hardenable stainless steels, 630 has the best corrosion resistance. In most environments, its corrosion resistance is comparable to 304 and is generally better than 400 series stainless steel.
In petrochemical, food industry, papermaking and other industries, the corrosion resistance of 630 is the same as that of 304L. In marine environments, 630 is easily corroded by seawater and is only suitable for offshore platforms.
17-7 Stainless Steel vs 17-4 â Whatâs the Difference?
Comparison of Chemical Composition: 17-7 Stainless Steel vs17-7 Stainless Steel
Grade 631 630
C â€0.09 â€0.07
Si â€1.00 â€1.00
Mn â€1.00 â€1.00
P â€0.040 â€0.040
S â€0.030 â€0.030
Cr 16.00~18.00 15.00~17.00
Ni 6.50~7.75 3.00~5.00
Al 0.75~1.50 ââ
Cu ââ 3.00~5.00
Nb ââ 0.15~0.45
17-7 Stainless Steel vs. 17-4 Application Differences?
â17-4PHâ: Widely used in aircraft and gas turbines, chemical processing equipment, petroleum and petroleum refining equipment, and food processing equipment, etc.â.
â17-7PHâ: Particularly suitable for aerospace applications, favored for its high strength, good formability and high temperature resistanceâ.
In Conclusion
17-7PH and 17-4PH precipitation hardening stainless steel materials have obvious differences in chemical composition, physical properties, mechanical properties and application fields.
Which material to choose depends on the specific application requirements and working environment. In actual applications, it is necessary to select appropriate precipitation hardening stainless steel materials according to engineering requirements and usage scenarios to ensure product quality and performance.
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Wuxi Walmay Metal Co., Ltd is a comprehensive processing group of Alloy SteelăForged Parts FittingăTitanium AlloyăStainless SteelăSpecial Welding Wireseries, and more than 800 specifications.
Our group has been engaged in the domestic and global market for more than ten years with rich steel experience and can offer professional advice for customers in applications with different materials.
we can customize products according to customerâs requirements. Under GB standards, ASTM standards, JIS standards, EN and other standards.