A283 Gr A steel composition(%)Carbon, max 0.14Manganese, max 0.90Silicon: 0.40 0.15-0.40Phosphorus, max 0.035Sulphur, max 0.04A283 Gr A steel plate mechanical propertyTensile Strength: 45, 000 -60, 000 psi [310 - 415 MPa]Min. Yield Point: 24, 000psi [165 MPa]Elongation in 8"": 27% minElongation in 2"": 38% min
The characteristic of niobium in S690QL steel plate specification etc. steel material is to increase the recrystallization temperature of austenite, so as to achieve the purpose of refining austenite grains. In general, the amount of niobium added in steel material is less than 0.05%, and the contribution of niobium above 0.05% to strengthening and toughening will no longer be obvious.
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During the construction of hot-dip S690QL steel plate specification 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 S690QL steel plate specification 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.