magnetic stainless steel sheets Curtain

So wash interval is influenced by many factors, the main factor is the aesthetic standards required. Although many steel wall is only flushed when the windows, but, in general, stainless steel per year for external washing twice.
Representation of the number and the stainless steel
① with international chemical element symbols and magnetic stainless steel sheets to represent their chemical composition, using the Arabic alphabet to represent ingredient: eg: China, Russia 12CrNi3A
② with a fixed number of digits to represent the stainless steel sheet metal or numbers; such as: USA, Japan, 300 series, 400 series, 200 series;
③ composition and sequence number with the Latin alphabet, saying only that purpose.
The number of rules
① elemental symbols
② purposes, 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: 20CrMnTi60SiMn, (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), stainless C ≤ 0.08% as 0Cr18Ni9, ultra-low carbon C ≤ 0.03% as 0Cr17Ni13Mo