With the development of API5L-B pipeline steel plate technology and the advancement of welded pipe forming and welding technology, the application scope of pipeline welded pipe is gradually expanding, especially the advantages of welded pipe in the range of large-diameter group spacing are more obvious. In 2004, the output of API5L-B (L245) seamless line pipe was about 400,000 tons. The steel grade includes X42-70, A572 Gr 42 CS steel carbon plate, and the varieties include onshore line pipe and subsea line pipe.
S550MC hot-rolled automobile sheet chemical composition (melting analysis)% C: ≤0.12, Si: ≤0.50, Mn: ≤1.80, P: ≤0.025, S: ≤0.015, Alt: ≥0.015, Nb: ≤0.09, V: ≤0.20, Ti: ≤0.15 Mechanical properties Yield strength MPa: ≥550 Tensile strength MPa: 600–760 Elongation: ≥12
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