Of alloy steel (except stainless steel)
Tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel: > Other: > Flanges: > Other > With an inside diameter of less than 360 mm: > Of alloy steel (except stainless steel)
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 7307.91.50.30
Alloy Steel Weld Neck Flange 150#
A weld neck flange made of alloy steel (not stainless), with an inside diameter of 8 inches (203 mm), designed for high-pressure piping systems in oil and gas applications. It falls under HTS 7307.91.50.30 as a flange of alloy steel with inside diameter less than 360 mm. The long tapered hub provides strength and reduces stress concentration at the weld.
Alloy Steel Slip-On Flange 300#
Slip-on flange of chrome-moly alloy steel, inside diameter 4 inches (102 mm), pressure rated 300#, used in boiler and pressure vessel connections. Classified under HTS 7307.91.50.30 due to its alloy steel construction (except stainless) and ID below 360 mm. It slips over the pipe end and is fillet welded for secure attachment.
Chrome-Moly Steel Blind Flange 600#
Blind flange constructed from ASTM A182 F11 chrome-moly alloy steel, 6-inch ID (152 mm), class 600, used to seal pipe ends in high-temperature refineries. HTS 7307.91.50.30 applies as it's an alloy steel flange (non-stainless) under 360 mm ID. Provides full sealing without internal bore.
Alloy Steel Socket Weld Flange 4 Inch
Socket weld flange of low-alloy steel, 4-inch nominal size (ID ~102 mm), for high-pressure instrumentation lines. Falls under HTS 7307.91.50.30 as non-stainless alloy steel flange less than 360 mm ID. Pipe inserts into socket and is fillet welded.
F5 Alloy Steel Raised Face Flange 250#
ASTM A182 F5 alloy steel flange with raised face, 10-inch ID (254 mm), 250# rating for petrochemical plants. HTS 7307.91.50.30 for alloy (non-stainless) steel flanges under 360 mm ID. Raised face ensures leak-proof gasket sealing.
Alloy Steel Long Weldneck Flange 12 Inch
Long weld neck flange from P11 alloy steel, 12-inch ID (305 mm, under 360), for high-stress furnace piping. Under HTS 7307.91.50.30 as non-stainless alloy flange. Extended hub for better flow and weld strength.
P22 Alloy Steel Plate Flange 8 Inch
Forged plate flange ASTM A182 F22, 8-inch ID (203 mm), for general industrial use. HTS 7307.91.50.30 covers alloy steel (except stainless) flanges <360 mm ID. Economical flat design for low-pressure apps.
Alloy Steel Lap Joint Flange 300# 6 Inch
Lap joint flange of alloy steel, 6-inch (152 mm ID), 300# class, used with stub ends for alignment ease. Classifies to HTS 7307.91.50.30 for non-stainless alloy flanges under 360 mm. Loose fit allows rotation for bolt alignment.
F9 Alloy Steel Flange for Heat Exchangers
Custom F9 alloy steel flange, 14-inch ID (356 mm), for shell-and-tube heat exchangers in power plants. HTS 7307.91.50.30 as alloy (non-stainless) steel flange <360 mm ID. Designed for thermal cycling resistance.
Alloy Steel Reducing Flange 10x6 Inch
Reducing weld neck flange alloy steel, 10-inch to 6-inch ID (152 mm min), for transitioning pipe sizes. Under HTS 7307.91.50.30 for non-stainless alloy flanges <360 mm. Maintains pressure rating across sizes.