What is the cheapest sa573 gr.70 structural steel plate that does not Rust?

We have 4 typical production lines, which can produce hot rolled Seamless, LSAW, ERW and SSAW pipes. SSAW pipe production line range is OD 219.1mm-3500mm, wall thickness 3.2mm-25.4mm. Product sa573 gr.70 structural steel plate annual capacity is 200 thousand tons.

sa573 gr.70 structural steel plate hot rolled products 2020 online stock: 16*2200*8000, 16*2000*10713, 20*2100*11600, 20*2150*10000, 25*1950*10150, 25*1950*9700, 30*2010*9500, 15*2500*10000, 50*2450*4800, 28*2170*13000, 60*2600*12150, 25*2400*8200, 40*2950*7100, 70*2270*7350, 70*2270*7600, 70*2500*12000, 75*2390*4320, 80*2200*10000, 88*3440*9200, 100*1770*6650.

ASTM A514 steel is mainly used in places where high tensile strength and high yield are required, such as engineering vehicle lifting gears, large excavators, offshore platforms, etc. Different grades of A514 steel plate have different thickness, chemical composition and properties. However, the sa573 gr.70 structural steel plate mechanical properties specified in ASTM A514 are similar to those of Q690 in China. A514 grade Q is generally used as the rack for offshore platform. Its hardness is between 230-390MPa, yield is greater than 630MPa, and tensile strength is more than 700MPa.

Tempering includes high temperature tempering, medium temperature tempering and low temperature tempering. Tempering means to reheat the sa573 gr.70 structural steel plate quenched steel to a certain temperature and then cool it in a certain way. Tempering can reduce or eliminate the internal stress produced by quenching, reduce the hardness and strength, and improve the ductility or toughness of steel. After sa573 gr.70 structural steel plate quenching, the workpiece should be tempered in time, and the required mechanical properties can be obtained through the combination of quenching and tempering.