303Se stainless steel 

 303Se stainless steel stainless steel pipe is an international label method. 303Se stainless steel tube - S30323 (USA AISI, ASTM) 303Se corresponding grades are Y1Cr18Ni9Se Chinese characteristics and purposes: To improve the cutting resistance, erosion resistance. Ideal for automatic lathes, rivets, screws 
 International Society of stainless steel marking method is to use the United States to mark a variety of standard three-digit level of malleable stainless steel. Including: ① austenitic stainless steel with 200 and 300 series digital mark, ② ferritic and martensitic stainless steel 400 series with a digital representation. For example, some of the more common austenitic stainless steel is 302, 304, 316 and 310 for the mark, ③ ferritic stainless steel is 430 and 446 for the tag, and 440C martensitic stainless steel is 410,420 for the mark, phase (austenite - ferrite), ④ stainless steel, precipitation hardening stainless steel and iron content of less than 50% of high-alloy usually patented name or trade name. Steel number and representation ① chemical element with the symbol of international and national symbols to represent the chemical composition of the Arabic alphabet to represent the component content: such as: China, Russia 12CrNi3A ② fixed number of digits to represent the steel class series or digital; as : United States, Japan, 300, 400 series, 200 series; ③ order form with the Latin alphabet and numbers, saying only that purpose. The number of China's rules ① ② use elemental symbols, Pinyin, open-hearth steel: P, boiling steel: F, killed steel: B, A steel: A, T8: Special 8, GCr15: Ball 

 ◆ structural steel, spring steel, such as: 20CrMnTi 60SiMn, (with very few that C content) ◆ Stainless steel, alloy tool steel (with a few thousandths of a C content), such as: 1Cr18Ni9 thousandth (ie, 0.1% C), stainless steel C ≤ 0.08% as 0Cr18Ni9, ultra-low carbon C ≤ 0.03% as 0Cr17Ni13Mo