Seamless Alloy Steel Drill Pipe Casing
Heavy-duty seamless tubes made from alloy steel with a circular cross section, outside diameter of 168.3 mm, and wall thickness of 25 mm, used as protective casing in oil and gas drilling operations. Classified under HTS 7304.59.80.40 due to seamless construction, alloy steel material, specified diameter range (114.3-190.5 mm), and thick walls exceeding 19 mm.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If made of non-alloy steel
Non-alloy steel seamless tubes fall under 7304.29, with identical size specs.
If welded construction
Welded alloy steel tubes of same dimensions classify in Chapter 73 heading 7306.
If OD exceeds 190.5 mm
Larger diameter seamless alloy tubes move to different size-specific subheading.
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Import Tips & Compliance
• Verify seamless construction via mill test certificates; welded pipes classify elsewhere
• Confirm alloy steel composition exceeds specified thresholds to avoid base steel headings
• Measure OD and wall thickness precisely; deviations shift to adjacent statistical suffixes
Related Products under HTS 7304.59.80.40
Thick-Wall Alloy Steel Pressure Piping
Seamless circular alloy steel pipes with 152.4 mm OD and 22 mm wall thickness, engineered for high-pressure fluid transport in petrochemical plants. Fits HTS 7304.59.80.40 for seamless alloy steel, OD 114.3-190.5 mm, wall ≥19 mm.
Alloy Steel Boiler Tube for Power Plants
Seamless tubes of alloy steel, 177.8 mm OD and 28 mm wall thickness, designed for superheated steam conveyance in utility boilers. Classified in 7304.59.80.40 as seamless, alloy, circular, within OD limits, thick-walled.
Heavy-Wall Seamless Alloy Steel Cylinder Liner
Seamless alloy steel tube with 139.7 mm OD and 24 mm wall thickness, used as cylinder liners in large diesel engines. Meets 7304.59.80.40 criteria: seamless, alloy steel, circular CS, OD range 114.3-190.5 mm, wall ≥19 mm.
Alloy Steel Hydraulic Cylinder Barrel
Precision seamless alloy steel barrel, 165.1 mm OD, 21 mm wall, for heavy hydraulic cylinders in construction equipment. HTS 7304.59.80.40 applies for seamless alloy tubes of specified size and thickness.
Seamless Alloy Steel Heat Exchanger Tube
Thick-walled seamless alloy tubes, 181 mm OD and 23 mm wall, for shell-and-tube heat exchangers in refineries. Classified 7304.59.80.40: seamless, alloy, circular, correct OD range, wall ≥19 mm.
High-Pressure Alloy Steel Injection Tubing
Seamless alloy steel tubing, 146 mm OD, 26 mm wall thickness, for high-pressure injection systems in chemical processing. Fits 7304.59.80.40 specifications precisely.