CORROSION-RESISTANT STEEL MATERIAL SUPERIOR IN TOUGHNESS IN HEAVY-HEAT-INPUT WELD ZONE FOR SHIP AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a corrosion-resistant steel material for a ship, which shows excellent corrosion resistance even in a severely corrosive environment of sea water, such as a ballast tank of the ship, can extend a period before being repair-coated, can ease an operation of repair coating, and is superior in toughness at a weld zone even when being welded by heavy heat input.;SOLUTION: The steel material includes 0.0030% or less O and 0.0005 to 0.0030% Ca, further includes 0.01 to 0.5% W and/or 0.02 to 0.5% Mo, 0.001 to 0.2% Sn and/or 0.01 to 0.2% Sb, controls Cu, Ni, Cr and Co to less than 0.05%, respectively, and has an ACP value, a WI value, and an ACR value controlled to predetermined values.;COPYRIGHT: (C)2009,JPO&INPIT