Welding grade high strength steel plate S690QL equivalent astm material

Normalizing is a special case of annealing, the effect is similar to annealing, but the microstructure obtained by normalizing is finer. For low or medium carbon steel, normalizing can improve hardness and machinability. For high strength steel plate S690QL medium carbon steel and low alloy steel, normalizing can refine grain and uniform structure and reduce hardness. For high carbon steel and high alloy steel, normalizing can eliminate the network carbide produced by forging and improve the homogeneity of the preparation heat treatment structure.

high strength steel plate S690QL Shanghai inventory: 12.9*2987*10384, 15*2200*10270, 14*1950*10600, 320*2200*4250, 32*2500*6000, 14*2200*10030, 65*3010*8230, 16*2100*10650, 36*2200*12000, 12.9*2987*10384, 14*1950*10900, 25*2500*12000, 15*2200*10270, 20*2620*11800, 14*1950*10450, 30*2200*12000, 14*2200*10030, 20.9*2851*7000, 20*2933*7300, 14*1950*10500, 50*2200*12000, 31.9*2920*9420, 20*2933*7300.

According to the new report of the World Steel Association (worldsteel), the world crude steel production for the 64 countries has reached to143.3 million tonnes (Mt) in February 2020, a 2.8% increase compared to February 2019. China’s high strength steel plate S690QL, crude steel production for February 2020 was 74.8 Mt, an increase of 5.0% compared to February 2019. India produced 9.6 Mt of crude steel in February 2020, up 1.5% on February 2019. Japan produced 7.9 Mt of crude steel in February 2020, up 2.2% on February 2019.

The main function of boron in high strength steel plate S690QL and so on steel is to increase the hardenability of steel, so as to save other rare and precious metals, such as nickel, chromium and molybdenum. For this purpose, the boron content is generally regulated in the range of 0.001% - 0.005%. It can replace 1.6% nickel, 0.3% chromium or 0.2% molybdenum. It should be noted that molybdenum can prevent or reduce temper brittleness, while boron slightly promotes temper brittleness, so molybdenum can not be completely replaced by boron.

Tags: