SA573 grade 70 carbon steel plate sheet price forecast on 2021.05.24
SA573 grade 70 carbon steel plate sheet, Q890D heat treatment delivery status: quenching and tempering.Q890D executive standard: GB/T16270Q890D chemical composition: carbon C≤0.18, silicon Si≤0.50, manganese Mn≤1.50, phosphorus P≤0.020, sulfur S≤0.010, chromium Cr≤0.90, nickel Ni≤1.20, molybdenum Mo≤0.60, niobium Nb≤0.06, vanadium V≤0.08, titanium Ti≤0.03, boron B≤0.003.
How to distinguish the inferior steel plate? 1. The surface of the fake and inferior steel plate is easy to produce scab. 2. The material of fake and inferior steel plate is not uniform and there are many impurities. The surface of fake and inferior steel plate is often pitted. Pitting is an irregular and uneven defect on the surface of SA573 grade 70 carbon steel plate sheet, steel plate caused by serious wear of rolling groove. Due to the pursuit of profit by the manufacturers of fake and inferior steel plates, the groove rolling often exceeds the standard.
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During the construction of hot-dip SA573 grade 70 carbon steel plate sheet galvanized pipe, the correct welding process shall be adopted, the inspection and acceptance shall be carried out in strict accordance with the specification, and the anti-corrosion treatment (zinc rich paint) shall be done timely after the welding is completed. It is feasible in the construction process of open and closed air conditioning system, which can improve the SA573 grade 70 carbon steel plate sheet construction speed and the firmness of the pipe connection. Therefore, the hot-dip galvanized pipe can be welded and connected under the construction conditions and on the premise of relevant protection and anti-corrosion measures.