How to improve the pass rate of Z-directed S690QL spec

45# steel is a high-quality carbon structural steel, which is widely used in machinery manufacturing. S690QL spec, 45# steel has good mechanical properties and is relatively cheap. 45# carbon structural steel chemical composition: carbon C: 0.42-0.50, silicon Si: ≤0.40, manganese Mn: 0.50-0.80, sulfur S: ≤0.045, phosphorus P: ≤0.045, chromium Cr: ≤0.40, nickel Ni: ≤0.40, molybdenum Mo: ≤0.10.

Galvanized seamless steel pipes are widely used, and can be divided into low and medium pressure galvanized seamless steel pipes, high-pressure galvanized seamless steel pipes, and stainless steel galvanized seamless steel pipes according to different requirements. Steel pipe S690QL spec can be used for industrial pipes with different pressures such as water vapor, air, oil, and gas.

Medium and heavy plate S690QL spec inventory spot:
23*3190*9220, 23*2470*8400, 22.5*3050*7300, 23*3500*10800, 21*3500*8840, 22*3400*11550, 29.5*1750*7150, 25*2500*12000, 27*1500*5000, 36*2720*7950, 27*1920*6000, 25*2630*3300, 26*3480*6000, 27*1800*6000, 23*2430*12370, 22.5*2560*6000, 43.5*1600*6000, 28.5*2500*6700, 32*1850*6000, 27.5*3100*6390, 48.5*1600*6000, 23.5*3300*14000, 33*3500*7050, 50*1600*6000.

Oxygen is a harmful element in S690QL spec steel. With the increase of oxygen content, the strength of S690QL spec steel increased, but the plasticity, especially the toughness, decreased significantly, and the weldability became worse. The presence of oxygen causes hot brittleness of S690QL spec steel.

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