Q690(Q690D = 100[690]Type Q = 100W[690W]Type Q = SHY685 = S690Q)
Chemical composition:
(P)：≤0.025,(S)：≤0.020,(Nb) ：≤0.11,(V)：≤0.12,(Ti)：≤0.20,(Cr)：≤1.00,(Ni)：≤0.80,(Cu)：≤0.80,(N)：≤0.015,（Mo):≤0.30,(B)：,(Al)：≥0.015
Mechanical Properties:
The yield strength:σs(MPa)::
≤16mm:the yield strength(Rm/Mpa )≥690;
16～40mm:the yield strength(Rm/Mpa )≥670;
40～63mm:the yield strength(Rm/Mpa )≥660;
63-80mm:the yield strength(Rm/Mpa )≥640;
The tensile strength:σb(MPa)
≤40mm:the tensile strength(Rm/Mpa )770-940;
40～63mm:the tensile strength(Rm/Mpa )750-920;
63-80mm:the tensile strength(Rm/Mpa )≥730-900;
The elongation:δ/%
≤40mm:the elongation(Rm/Mpa )≥14;
40～63mm:the elongation(Rm/Mpa )≥14;
63-80mm:the elongation(Rm/Mpa )≥14;
