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  1. mojtaba20

    WHAT IS DIFFERENT BETWEEN P9 AND T9 AS HEATERS COIL?

    we want to change heaters tube. material of this coil is astm a312 p9. we want to use astm a213 T9. WHAT IS DIFFERENT BETWEEN ASTM A213 T9 and ASTM A312 P9? WHEN WE ARE ALLOWED TO USE ASTM A312 P9 AND WHEN WE ARE ALLOWED TO USE ASTM A213 T9? WHAT IS DIFFERENT BETWEEN P9 AND T9 AS HEATERS COIL?

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