Before use, all alloy steel pipes/tubes, fittings, parts and valves should be inspected by spectroscopic probing and the alloy must be labeled for each.
合金钢管道 alloy steel pipeline
管件 plumbing
管道附件 fittings
Alloy steel pipe, pipe fittings, pipe fittings and valves before use, should one by one spectral review, and material marking
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