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STEEL SHEETS FOR ULTRA HIGH STRENGTH MAIN PIPES AND ULTRA HIGH STRENGTH MAIN TUBES HAVING PERFECT LOW-TEMPERATURE SHOCK VISCOSITY AND METHODS OF THEIR MANUFACTURE
STEEL SHEETS FOR ULTRA HIGH STRENGTH MAIN PIPES AND ULTRA HIGH STRENGTH MAIN TUBES HAVING PERFECT LOW-TEMPERATURE SHOCK VISCOSITY AND METHODS OF THEIR MANUFACTURE
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机译:具有完美低温冲击粘度的超高强度主要管材和超高强度主要管材的钢板及其制造方法
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摘要
Ultra-high-strength linepipes having excellent low-temperature toughness manufactured by welding together the edges of steel plates comprising C of 0.03 to 0.07 mass %, Si of not more than 0.6 mass %, Mn of 1.5 to 2.5 mass %, P of not more than 0.015 mass %, S of not more than 0.003 mass %, Ni of 0.1 to 1.5 mass %, Mo of 0.15 to 0.60 mass %, Nb of 0.01 to 0.10 mass %, Ti of 0.005 to 0.030 mass %, Al of not more than 0.06 mass %, one or more of required amounts of B, N, V, Cu, Cr, Ca, REM (rare-earth metals) and Mg, with the remainder consisting of iron and unavoidable impurities and having a (Hv-ave)/(Hv-M) ratio between 0.8 and 0.9 at 2.5P4.0, wherein Hv-ave is the average Vickers hardness in the direction of the thickness of the base metal and Hv-M is the martensite hardness depending on C-content (Hv-M=270+1300C) and a tensile strength TS-C between 900 MPa and 1100 MPa; P=2.7C+0.4Si+Mn+0.8Cr+0.45(Ni+Cu)+(1+)Mo1+ (=1 when B3 ppm and =0 when B3 ppm).
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