P91 Grade T91 Chromium-Moly Alloy Steel Plate
ASME SA387 Grade P91 (T91) is a 9Cr-1Mo-V alloy steel plate over 600 mm wide, used for power plant piping and superheaters. Its high chromium content (8% to 9.5%) is below the 10.5% threshold for stainless steel, so it is classified as other alloy steel. As a hot-rolled flat product not further worked, it falls under tariff item 7225.99.00 as 'Other'.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | +50.0% | 50% |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the chromium content is 10.5% or more
Steel with 10.5% or more chromium is stainless steel, classified in heading 72.19.
If cold-rolled
Cold-rolled alloy steel flat products are classified under 7225.50.00.
If width is less than 600 mm
Flat-rolled alloy steel under 600 mm wide falls under heading 72.26.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the chromium content is documented as below 10.5% to avoid classification as stainless steel under heading 7219
• Provide the ASME specification and heat treatment details
• The plate width must exceed 600 mm; if narrower, heading 7226 applies
Related Products under Tariff item 7225.99.00
15CrMo Alloy Steel Pressure Vessel Sheet
> 15CrMo is a low-alloy chromium-molybdenum steel, flat-rolled into sheets for boiler and pressure vessel applications. With a width exceeding 600 mm, it meets the definition of flat-rolled products of other alloy steel. It does not match the specific subheadings for heat-resisting or electrical steels, so it falls under this residual "Other" item.
A204 Grade C Molybdenum Alloy Steel Plate
> A204 Grade C is a molybdenum alloy steel plate with 0.5% molybdenum, supplied flat-rolled with a width of 700 mm and thickness of 40 mm. It is used for pressure vessels. This product is classified as other alloy steel, not stainless or electrical, and falls under the "Other" item.
A302 Grade A Manganese-Molybdenum Alloy Steel Plate
ASTM A302 Grade A is a normalized manganese-molybdenum alloy steel plate supplied in widths exceeding 600 mm, primarily used for pressure vessel fabrication. Its molybdenum content of 0.45% to 0.65% by weight classifies it as other alloy steel under heading 72.25, as it does not meet the definitions for stainless, tool, or silicon-electrical steel. The product is hot-rolled and not further worked, falling under tariff item 7225.99.00 as 'Other' flat-rolled alloy steel.
A353 Grade Ni-Ni Alloy Steel Plate for Low-Temperature Service
ASTM A353 is a 9% nickel alloy steel plate supplied in widths exceeding 600 mm, designed for cryogenic service such as LNG storage tanks. The high nickel content (approximately 9%) makes it an alloy steel, but it does not qualify as stainless steel because its chromium content is below 10.5%. As a hot-rolled, flat-rolled product not further worked, it is classified under tariff item 7225.99.00 as 'Other' alloy steel.
A387 Grade 11 Heat-Resistant Alloy Steel Plate
ASTM A387 Grade 11 is a chromium-molybdenum alloy steel plate with a width exceeding 600 mm, used for elevated-temperature service in refinery and pressure vessel applications. Its chromium content of 1% to 1.5% by weight qualifies it as other alloy steel, but it does not meet the 10.5% chromium threshold for stainless steel. The product is hot-rolled and not further worked, placing it under tariff item 7225.99.00 as 'Other' flat-rolled alloy steel.
A514 Grade B High-Yield Strength Alloy Steel Plate
ASTM A514 Grade B is a quenched and tempered high-yield-strength alloy steel plate, over 600 mm wide, used for structural applications requiring high strength-to-weight ratios. Its alloying elements, including chromium, molybdenum, and boron, make it an other alloy steel, but it does not meet the stainless steel definition. As a hot-rolled flat product not further worked, it is classified under tariff item 7225.99.00 as 'Other'.