The higher the Cr-Mo content in the material a387 gr.22 class2 equivalent grades, the lower the control of harmful inclusions, the better the hydrogen corrosion resistance. In recent years, China has gradually specialized the materials of pressure vessel equipment, among which the main materials of medium temperature hydrogen resistant steel are 15CrMoR (equivalent to SA387 Gr 12), 14Cr1MoR (equivalent to SA387 Gr 11), and 12Cr2Mo1R (equivalent to SA387 Gr 22).
The company has passed the ISO9001: 2008 quality system certification, strictly implemented the ISO9001 quality management system. Besides, we have continuously improved the after-sales service network to make every effort to provide more convenient, accurate and faster services for all customers. We will supervise the production, control the quality in the factory, Inspect the cargo before shipment, Issue the test report to sales department. From the steel prodcution to steel delivery, we always focus the whole process.
a387 gr.22 class2 equivalent grades, Large diameter spiral steel pipe refers to the relatively large diameter spiral steel pipe, which is generally required to be more than 1000mm. The manufacturing process of large-diameter spiral steel pipe: first, the steel strip is bent into shape, and then welded together to make a large-diameter spiral steel pipe of specified size. After being processed into a pipe, hydrostatic test, bending, flattening and other tests shall be carried out, and the internal steel support of large-diameter spiral steel pipe can be made according to customer requirements.
Global a387 gr.22 class2 equivalent grades crude steel production in March this year increased by 2.6 percent month on month and fell by six percent year on year to 147.1 million metric tons. accordina to the World Steel Association (worldsteel).In the first quarter of this year, global a387 gr.22 class2 equivalent grades crude steel production decreased to 443.03 million mt, down 1.4 percent year on year.