3.1.1 The trademark and chemical composition of steel (melting analysis) shall conform to the rules in the "Trademark and chemical composition" table.
3.1.1.1 On the premise of ensuring the function of the steel plate, the Cr, Ni, Mo alloying elements specified in the "trademark and Chemical composition" can be joined in any combination, and other microalloying elements other than the rules of the "trademark and chemical composition" table can also be added, and the detailed content should be indicated in the quality certificate.
3.1.1.2 When Cu in steel is the remaining element, its content should not be greater than 0.30%; As content should not be greater than 0.08%. If the supplier can ensure, no analysis.
3.1.1.3 When calculating total aluminum (Alt) content, Alt should not be less than 0.015%.
3.1.2 The error tolerance of the chemical composition of the product steel plate shall comply with the rules of GB/T 222.
3.2 Practice Methods
Steel is practiced by converter or electric furnace and refined outside the furnace.
Cutting large steel plates as your requirements to make the surface of the plate bright by miling and grinding, also can make holes and make angle degrees,and can weld by your drawing.
For the thickness under 30mm, cutting by laser ;For thickness over 30mm, mainly OXY-cut, flame cutting.
For the thickness 200mm steel plate, because during the flame cutting, the temperature is very high, so the cutting parts steel plate might be broken at the angle part, then our workers will repair the angles to be good condition.
