A small amount of Nb is sufficient to obtain excellent comprehensive properties of A709 Gr 50S bridge steel plate etc. steel material, because at low Nb concentration, the yield strength of steel material increases faster and is proportional to the concentration, but when the Nb content is greater than 0.03%, the strengthening effect begins to decrease. Studies have shown that when the Nb content is greater than 0.06%, excess Nb will no longer strengthen the steel material.
Q690D material is a Chinese standard high-strength welded structural steel. What does Q690D stand for? Q represents the yield strength, 690 represents the yield strength value, and D represents the quality of the Q690 steel. The quality grades are A, B, C, D, and E, respectively. The impact of Grade D steel plate is﹣20°C. Q690D executive standard: GB / T1591-2008. A709 Gr 50S bridge steel plate, Q690D steel has high yield strength and tensile strength.
A 25 percent tariff on imports led to a temporary spike in steel prices last year but also hurt sales and profits at companies that buy steel, such as General Motors. And as manufacturers substituted other materials or cut production, A709 Gr 50S bridge steel plate steel prices have fallen back to where they were before the tariffs and stock prices for the largest U.S. producers fell by as much as 47 percent, the New York Times reported Monday.
High strength steel A709 Gr 50S bridge steel plate product selling stock: 8*2000*6000, 12*1524*6096, 16*1720*10070, 12*2335*5000, 8*2000*9300, 15*2430*5650, 20*1830*10950, 14*1524*6096,8*2000*5300, 15*2000*12000, 22*2438*6096, 15*2000*10000, 10*1600*6500, 14*2000*10000, 22*2150*8500,18*2000*10000, 10*1600*6500, 14*2438*6096, 38*2700*6000, 40*2030*12400.
