How to optimize quality of differences between a573 grade 70 and a516 grade 70 steel

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14Cr1MoR pressure vessel steel belongs to Cr-Mo anti-hydrogen steel.It is suitable for large-scale equipment such as petrochemical, nuclear power, steam turbine cylinders, thermal power and other high temperature and high pressure, and hydrogen or hydrogen mixed medium. These differences between a573 grade 70 and a516 grade 70 steel products are also suitable for large equipment such as petrochemical, nuclear power, steam turbine cylinder, thermal power and other high temperature and high pressure, and hydrogen or hydrogen mixed medium.

Weathering steel is characterized in that the alloy composition and weight percentage content. The chemical composition C≤0.12, Si: 0.25 ～ 0.75, Mn: 0.20 ～ 0.50, P: 0.07 ～ 0.15, S≤0.03, Cu: 0.25 ～ 0.55 , Cr: 0.30 ～ 1.25, Ni≤0.65, and the rest are Fe and trace impurities. Weathering steel sheet differences between a573 grade 70 and a516 grade 70 steel is mainly used for steel structures such as railways, vehicles, bridges, and towers that are exposed to the atmosphere for a long time.

With the increase of temperature, the yield limit of differences between a573 grade 70 and a516 grade 70 steel will decrease monotonically, but the tensile strength of differences between a573 grade 70 and a516 grade 70 steel will rise to a high peak value at a certain temperature, and then decrease. This peak temperature is called the blue brittleness temperature of differences between a573 grade 70 and a516 grade 70 steel. Near the blue brittleness temperature, the differences between a573 grade 70 and a516 grade 70 steel strength increases and the plasticity decreases. The elongation and section shrinkage of differences between a573 grade 70 and a516 grade 70 steel increase with the increase of temperature, but there is a low peak at the blue brittleness temperature. The blue brittleness temperature of low carbon steel ranges from 200 ℃ to 250 ℃. The blue brittleness of low alloy steel is not obvious as that of low carbon steel, and the blue brittleness temperature is higher.

10# seamless steel pipe chemical composition : C: 0.07-0.13, Si: 0.17-0.37, Mn: 0.35-0.65, Cr: 0.15, Ni: 0.30, Cu: 0.25. 10# seamless steel pipe mechanical properties: recommended heat treatment temperature: 930℃, tensile strength: 335 MPa, yield strength: 205 MPa, elongation: 31%, impact energy is not required. differences between a573 grade 70 and a516 grade 70 steel, 10# seamless steel pipe has high plasticity and toughness, no temper brittleness tendency, and good weldability. Its machinability under cold drawing or normalizing treatment is obviously improved. In cold state, 10# seamless steel pipe is easy to be extruded and molded, but its strength is low, and its hardenability is very poor.

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