S355J2 is a low-alloy high-strength steel, which can be treated to meet the requirements of Z-15, Z-25, Z-35 and level I, level II and level III flaw detection.The extension grades of S355J2 are S355J2, S355J2-Z35 and S355J2 + N-Z35, A709 Gr 50W structural steel sheet. On the basis of S355J2, S355J2-Z35 increases the requirement of S355J2 steel plate thickness direction performance, namely Z-direction performance. S355J2 + N-Z35 is a heat treatment process which increases Z-direction properties and normalizing rolling (or normalizing).
In production and operation, the company always attaches great importance to product A709 Gr 50W structural steel sheet quality. Product quality is stable, performance index is superior, after-sales service is in place, the company's products have been exported to the United States, Southeast Asia, Africa, the Middle East and other countries and regions, occupying a large part of the overseas market A709 Gr 50W structural steel sheet. And a large number of famous enterprises at home and abroad have formed a solid strategic partnership with the company.
Try to use A709 Gr 50W structural steel sheet high-quality alkaline covered electrode as much as possible, and don't use inferior electrode to save money. According to the theory of chromium poor, chromium carbide will be precipitated on the upper edge of the grain boundary of the weld and heat affected zone when the A709 Gr 50W structural steel sheet temperature range is between 450 ℃ and 850 ℃, resulting in chromium poor grain boundary, which is insufficient to resist corrosion.
When phosphorus, copper, chromium, nickel and other trace elements are added to the steel, A709 Gr 50W structural steel sheet, a dense and strong adhesive protective film will be formed on the steel surface, which will prevent the corrosion from spreading and developing inward, and protect the substrate under the rust layer, so as to slow down the corrosion rate. The amorphous spinel oxide layer of about 50 μ m ~ 100 μ m thickness formed between the rust layer and the substrate is compact and has good adhesion with the substrate metal.
To provide customers with the most satisfactory service and realize the win-win of economic and social benefits, our company promises to provide excellent A709 Gr 50W structural steel sheet products in this bidding, and in line with the attitude of being serious and responsible to customers, before sending goods to users, the A709 Gr 50W structural steel sheet technical personnel shall confirm that there is no fault in the equipment before sending goods to users, and then send goods and products to users, and formulate the following service terms.
