S30403 stainless steel standard, characteristics and grades
2024-07-29 16:47:29
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S30403 stainless steel standard, characteristics and grades
S30403 stainless steel belongs to the American standard low-carbon austenitic stainless steel. S30403 belongs to Cr18, Ni9 type austenitic stainless steel, and its carbon content is ≤0.03.
S30403 stainless steel implementation standards: ASTM A 959-2004, ASTM A493-2009 (2013), ASTM A240/240M-2018, ASTM A276/A276M-2017, ASTM A473-2018, SAE J405-2018, SAE J467b-1956 (R1968), ASTM A493-2016, ASTM A240/A240M-2020, ASTM A959-2019, GB/T 20878-2007, GB/T 24511-2017, GB/T 4237-2015, NB/T 47010-2017;
S30403 stainless steel material grades: grades (unified digital code): new 022Cr19Ni10 (S30403), old 00Cr19Ni10, 304L;
S30403 stainless steel hardness Stainless steel pipes are generally measured by three hardness indicators: Brinell, Rockwell and Vickers.
1. Brinell hardness In stainless steel pipe standards, Brinell hardness is widely used, and the hardness of the material is often expressed by the indentation diameter, which is both intuitive and convenient. However, it is not applicable to steel pipes made of harder or thinner steel.
2. Rockwell hardness The Rockwell hardness test of stainless steel pipe is the same as the Brinell hardness test, which is an indentation test method. The Rockwell hardness test is currently the most widely used method, among which HRC is second only to the Brinell hardness HB in the steel pipe standard. The Rockwell hardness can be used to measure metal materials from very soft to very hard. It makes up for the shortcomings of the Brinell method. It is simpler than the Brinell method and the hardness value can be read directly from the dial of the hardness machine. However, due to its small indentation, the hardness value is not as accurate as the Brinell method.
3. Vickers hardness The Vickers hardness test for stainless steel pipe is also an indentation test method, which can be used to determine the hardness of very thin metal materials and surface layers. It has the main advantages of the Brinell and Rockwell methods, and overcomes their basic disadvantages, but it is not as simple as the Rockwell method. The Vickers method is rarely used in steel pipe standards.
S30403 is an ultra-low carbon austenitic stainless steel developed to solve the problem of Cr23 and C6 precipitation in 304 material, which causes the material to have a serious tendency to intergranular corrosion under certain conditions. Its intergranular corrosion resistance in the sensitized state is significantly better than that of 304. Except for slightly lower strength, its other properties are the same as 304. It can be welded using various common stainless steel welding processes, and no heat treatment is required after welding.
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