Due to different uses, each product has different processing techniques and raw material quality requirements.
Different stainless steel products require different thickness tolerances of raw materials. For example, Class II tableware and thermos cups have higher thickness tolerance requirements of -3~5%, while Class I tableware has a thickness tolerance of -3%. The requirement is -5%, the steel pipe requirement is -10%, the thickness tolerance requirement for hotel freezer materials is -8%, and the dealer's thickness tolerance requirement is generally between -4% and 6%.
At the same time, the difference in domestic and foreign sales of products will also lead to different customer requirements for raw material thickness tolerances. Generally, export product customers have higher thickness tolerance requirements, while domestic sales companies have relatively low thickness tolerance requirements (mostly due to cost considerations), and some customers even require -15%.
Extended information:
1. Structural components
The corrosion resistance of stainless steel decreases as the carbon content increases. Therefore, the carbon content of most stainless steel The amounts are all low, with a maximum of no more than 1.2%. The ωc (carbon content) of some steels is even lower than 0.03% (such as 00Cr12).
The main alloying element in stainless steel is Cr (chromium). Only when the Cr content reaches a certain value, the steel has corrosion resistance. Therefore, stainless steel generally has a Cr (chromium) content of at least 10.5%. Stainless steel also contains Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other elements.
2. Numbering and representation of steel
1. Use the international chemical element symbol and the country’s symbol to represent the chemical composition, and use Arabic letters to represent the component content:
For example: China and Russia 12CrNi3
2. Use fixed-digit numbers to represent steel series or numbers; such as: the United States, Japan, 300 series, 400 series, 200 series;
3. Use Latin letters and order to form the serial number, which only indicates the purpose.
China’s numbering rules
4. Use element symbols
5. Purpose, Chinese Pinyin, open-hearth steel: P, boiling steel: F, killed steel: B. Class A steel: A, T8: Special 8, GCr15: Ball.
Baidu Encyclopedia-Stainless Steel