9Cr-1Mo-V SA-335 P91 Seamless Pipe
Advanced martensitic alloy steel pipe (P91 grade, 9Cr-1Mo-V) with 139.7 mm OD and 12.7 mm minimum wall, for supercritical power plant headers. HTS 7304.59.80.35 applies to its seamless, circular, other alloy steel construction within exact dimension limits. Normalized and tempered per ASTM A335.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If cold-drawn/finished hollow bar
Cold-worked seamless hollow sections primarily for machining classify as semi-finished in Chapter 72.
If lower alloy content <0.3% total
Pipes not meeting alloy steel definition (per Chapter Note 1(f)) go to carbon steel provisions.
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Import Tips & Compliance
• Require QTC (Quality Test Certificate) with PWHT (post-weld heat treatment) records for code compliance
• Declare 'P91' grade explicitly; generic 'alloy steel' descriptions trigger secondary exams
• Ship in protective wooden crates to prevent flattening of thick walls during transit
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