热镀锌钢波纹涵管 管涵厂家 热镀锌管涵厂家 涵管厂家 热镀锌

Corrosion resistance also depends on the composition of the alloy. The corrosion resistance of seamless galvanized steel with the same chemical composition is the same as that of fully heat-treated *n galvanized steel. Additional tests provided by ASTM prove that the corrosion resistance at the welding site is equivalent to or better than the welded metal. In an acidic chloride environment, the corrosion of the welded steel pipe that is not fully heat-treated will accelerate, but this is only the need for corrosion testing. In fact, the environment is not so bad.