Stainless steel is in the air or chemical corrosion medium can resist a high-alloy steel.

     Stainless steel has a beautiful surface and good corrosion resistance, without going through the plated surface treatment, play inherent in the surface properties of the stainless steel used in wide range of steel, often referred to as stainless steel. Representative of the performance of 13 chrome steel, 18 chrome-nickel steel alloy.

     From the metallographic point of view, because the stainless steel contains chromium chromium film formed on the surface leaving a thin, the membrane separating oxygen from invading the inner steel corrosion effect.

     In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 12% chromium.

     Stainless Steel Type:

     Stainless steel can use, chemical composition and microstructure to the general classification.

     In austenitic class steels composed of 18% chromium and 8% nickel as the basic composition, an amount of variation of the different elements, and the development of various uses of steel.

     In chemical composition:

     ①. CR Series: ferritic series, martensite series

     ②. CR-NI Series: austenitic series, unusual series, precipitation hardening series.

     With microstructure Category:

     ①. Austenitic stainless steel

     ②. Ferritic stainless steel

     ③. Martensitic stainless steel

     ④. Duplex stainless steel

     ⑤. Precipitation hardening stainless steel

     Stainless steel identification method

     Steel symbol and representation

     ① chemical element with the symbol of international and national symbols to represent the chemical composition, using the Arabic alphabet to represent the content:

     Such as: China, Russia 12CrNi3A

     ② with a fixed number of digits to represent the steel type series or digital; such as: USA, Japan, 300 series, 400 series, 200 series;

     ③ composition of the Latin alphabet and the order number, saying only that purpose.

     The number of rules

     ① using element symbols

     ② use Hanyu Pinyin, open-hearth steel: P, boiling steel: F, killed steel: B, Group A steel: A, T8: Special 8,

     GCr15: Ball

     Structural steel, spring steel, such as: 20CrMnTi 60SiMn, (with a very few that C content)

     Stainless steel, alloy tool steel (with a few thousandths C content), such as: 1Cr18Ni9 thousandth (ie

     0.1% C) 0Cr18Ni9 stainless C≤0.08% as ultra-low carbon C≤0.03% as 0Cr17Ni13Mo

     International Stainless Steel labeling method

     American Iron and Steel Institute with three digits to indicate a variety of standard grade stainless steel malleable. Among them:

     ① austenitic stainless steel 200 and 300 series of numerals,

     ② ferritic and martensitic stainless steel 400 series is represented by a number. For example, some of the more common austenitic stainless steel

     Is 201, 304, 316 and 310 as a marker,

     ③ ferritic stainless steel is marked 430 and 446, 410, 420, and 440C martensitic stainless steel is a scalar

     Hutchison, duplex (austenitic - ferritic),

     ④ stainless steel, precipitation hardening stainless steel and high alloy iron content of less than 50% usually uses proprietary name or trademark name.