API Spec 5CT C75 Tubing
C75 grade seamless nonalloy steel tubing per API 5CT for controlled yield oil/gas wells. Balances strength and ductility for drilling completions. HTS 7304.29.50 classification for nonalloy drill tubing.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If electric resistance welded (ERW)
Welded versions exclude from seamless 7304 classification.
If certain proprietary controlled hardness grades
Statistical suffixes for specialized API grades.
If downhole tools/gauges requiring specific tubing specs
Compiled machines for oilfield measurement use 8479.
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Import Tips & Compliance
• C75 requires special notch toughness testing—include impact test results
• Mark grade clearly; C75/C95 confusion common in mixed lots
• Trade agreements may offer duty relief for certified API products
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