17-4PH Seamless Aerospace Duct Tube
Seamless 17-4PH precipitation hardening heat-resisting steel tube for aircraft engine ducting with thermal cycling resistance. Covered by HTS 7304.59.60.00 as circular seamless tubes of other heat-resisting alloy steel.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If welded precipitation hardening steel
Welding process for similar alloys classifies under welded 'other steel' pipes.
If not fully processed into tubes
Semi-finished hollow shapes from stainless bars classify in Chapter 72.
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Import Tips & Compliance
• AMS 5643 aerospace material specification mandatory for validation
• ITAR compliance essential; declare aerospace end-use on entry summary
• Solution annealed condition must be documented to prove heat treatment status
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