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Standard: | BS, JIS, GB, DIN, ASTM, API | Standard: | BS 1387, BS 3059-2, JIS G3454-2007, GB 5310-1995, GB 3087-1999, GB/T 8163-1999, GB/T 9711.1-1997, GB/T 5312-1999, DIN 1629/3, ASTM A106-2006, ASTM A53-2007, ASTM A210-1996, ASTM A312-2007, API 5CT, API 5L
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