【13652072097】 ① left managers with international symbols of chemical elements and their symbols to represent the chemical composition, with the Arabic alphabet to represent the component content: such as: China, Russia 12CrNi3A 
 ② with a fixed number of digits to represent the steel class series or digital; such as: USA, Japan, 300 series, 400 series, 200 series; 
 ③ the order form with the Latin alphabet and numbers, saying only that purpose. Number of rules in China 
 ① using element symbols 
 ② use Hanyu Pinyin, open-hearth steel: P, boiling steel: F, killed steel: B, A steel: A, T8: Special 8, GCr15: ball bearing steel, spring steel, such as 20CrMnTi 60SiMn, (with a few extreme that C content) stainless steel, alloy tool steel (with a few thousandths of a C content) 
 Such as: 1Cr18Ni9 thousandth (ie, 0.1% C), such as stainless steel C ≤ 0.08% 0Cr18Ni9, ultra-low carbon C ≤ 0.03% stainless steel marking methods such as 00Cr17Ni13Mo American International Iron and Steel Institute is to mark a variety of standard three-digit level of malleable stainless steel. 
 Of which: 
 ① austenitic stainless steel with 200 and 300 series digital mark, for example, some of the more common austenitic stainless steel is 201, 304, 316 and 310 for the mark. 
 ② ferritic and martensitic stainless steel 400 series with a digital representation. 
 ③ ferritic stainless steel is 430 and 446 for the tag, and 440C martensitic stainless steel is 410,420 for the mark, two-phase (austenite - ferrite), 
 ④ stainless steel, precipitation hardening stainless steel, and iron content of less than 50% of high-alloy is often used proprietary name or trademark name. 4). Standard Classification and grading 4-1 grade category: 
 National Standard GB ② ① industry standard YB ③ ④ local standard enterprise standard Q / CB 
 ① ② product standard method of packaging standards ③ ④ basic standards 4-3 standard standard level (three levels): Y-class: the international advanced level I: the general level of international class H: advanced level GB1220-84 stainless steel rods (I grade) GB4241-84 stainless steel welded plate Park (H grade) GB4356-84 stainless steel welded plate garden (I grade) GB1270-80 stainless steel pipe (I grade) GB12771-91 stainless steel pipe (Y class) GB3280-84 stainless steel cold plate (I grade) GB4237-84 stainless steel hot plate (I grade) GB4239-91 with stainless cold (I grade) 
 VI: Product Details [200] stainless steel - cold-rolled strip - hot rolled - stainless steel - Reel