?The main standard available: GB(GB 8162, GB 8163, GB3087 GB 6479, GB 9948); ASTM (A106B, A53B, API 5L A179, A192, SA210, SA213; API (5CT, K55, J55) DIN1629, St44, DIN17175Trademark:HaorenProductivity:800,000 tons per year for allUnit Price/Payment:negotiableCompany:Jiangsu Zh...
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