不锈钢管用钢的牌号和化学成分应符合下表的规定。 序号 牌号 化学成分，% C Si Mn S P Ni Ni Ti Mo 1 00Cr18Ni10 ≤0.03 ≤1.00 ≤2.00 ≤0.030 ≤0.035 17.00~19.00 8.00~12.00 ____ ____ 2 1Cr18Ni9Ti ≤0.12 ≤1.00 ≤2.00 ≤0.030 ≤0.035 17.00~19.00 8.00~11.00 5(C%~0.02)~0.8 ____ 3 00Cr17Ni14Mo2 ≤0.03 ≤1.00 ≤2.00 ≤0.030 ≤0.035 16.00~18.00 12.00~16.00 ____ 1.80~2.50 4 1Cr18Ni12Mo2Ti ≤0.12 ≤1.00 ≤2.00 ≤0.030 ≤0.035 16.00~19.00 11.00~14.00 5(C%~0.02)~0.8 1.80~2.50 5 1Cr18Ni12Mo3Ti ≤0.12 ≤1.00 ≤2.00 ≤0.030 ≤0.035 16.00~19.00 11.00~14.00 5(C%~0.02)~0.08 2.50~3.50