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astm a312 Develop standards for the American Association of Materials and Tests on the welded steel pipes of austenitic stainless steel seamless steel pipes ASTM A312 The coefficients of welded steel pipes are as follows:：
ASTM A312 The austenitic stainless steel is as follows：
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United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.
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