Alloy Steel Mechanical Tubing 4140 Grade
Cold-drawn or hot-rolled tubing from 4140 chrome-moly alloy steel, used for shafts, axles, and structural components in heavy equipment. Classified under 7306.90.5000 for welded or open-seamed hollow profiles of alloy steel not covered by precision or line pipe headings.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If seamless and for bearing/gear use
Precision seamless tubes of alloy steel for specific mechanical applications fall under Chapter 72 semifinished products.
If carbon steel, not alloy
Without sufficient alloy elements (e.g., <1.65% Mn, no Cr/Ni), it classifies as carbon steel other tubes.
If sold as parts for bulldozers/excavators
End-use as specific machinery parts overrides tube classification.
Not sure which classification is right?
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Import Tips & Compliance
• Include heat treatment records (normalized/annealed) as alloy steel proof; random sampling may be required
• Label with exact alloy grade and dimensions to prevent reclassification as iron/steel scrap
Related Products under HTS 7306.90.50.00
Welded Alloy Steel Square Hollow Section
ERW welded square hollow structural section (HSS) from alloy steel grades like A500 or A513, used in construction frameworks and machine bases. Fits 7306.90.5000 as other hollow profiles of alloy steel, distinct from circular pipes.
Chrome-Moly P91 Alloy Boiler Tube
High-temperature P91 (9Cr-1Mo) alloy steel tube for supercritical boiler superheaters and reheaters. Classifies in 7306.90.5000 as other alloy steel tubes, excluding line pipe or casing applications.
17-4PH Stainless Alloy Steel Hollow Bar
Precipitation-hardened 17-4PH stainless alloy steel hollow bar, machined from tube for valve bodies and pump shafts. 7306.90.5000 covers this as other alloy steel hollow profiles with wire dimensions under 16mm max.
Alloy Steel Scaffolding Pipe Adapter Tube
Short adapter tubes from high-strength alloy steel connecting standard scaffolding pipes. Classified 7306.90.5000 as other welded alloy steel tubes for construction equipment.
Nitrided Alloy Steel Mandrel Bar Tube
Surface-nitrided 4340 alloy steel hollow mandrel bars used in tube drawing operations. 7306.90.5000 for specialized alloy steel hollow profiles in metalworking.
High-Pressure Alloy Steel Accumulator Shell
Cylindrical shells from 4340 or 300M alloy steel for hydraulic accumulators storing pressurized fluid. 7306.90.5000 applies to these welded or seamless pressure vessels under tube dimensions.