Of alloy steel (except stainless steel)
Tube or pipe fittings (for example, couplings, elbows, sleeves), of iron or steel: > Other: > Flanges: > Not machined, not tooled and not otherwise processed after forging: > 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 7307.91.30.00
Alloy Steel Forged Swivel Flange
Swivel flange assembly forged from non-stainless alloy steel allowing rotation for bolt alignment in shipbuilding. HTS 7307.91.30.00 for basic unprocessed forging. Facilitates installation on misaligned pipes.
Forged Alloy Steel Weld Neck Flange
A forged flange made from alloy steel (not stainless) with a long tapered hub for welding to pipes, used in high-pressure oil and gas pipelines. It falls under HTS 7307.91.30.00 as it is not machined, tooled, or otherwise processed after forging, meeting the 'rough' flange criteria. These flanges provide strong, leak-proof connections in demanding industrial applications.
Rough Forged Alloy Steel Slip-On Flange
A basic slip-on flange forged from non-stainless alloy steel, designed to slide over pipe ends before welding, ideal for moderate-pressure chemical processing lines. Classified under HTS 7307.91.30.00 because it remains unprocessed post-forging, retaining forging scale and rough surfaces. Provides cost-effective connections without requiring precise pipe alignment.
Unprocessed Alloy Steel Blind Flange
Forged blind flange from alloy steel (excluding stainless), used to seal pipe ends in pressure vessel systems for refineries. It qualifies for HTS 7307.91.30.00 as it is supplied rough-forged without machining or tooling. Essential for safe isolation in high-stress environments.
Forged Alloy Steel Socket Weld Flange
Rough-forged socket weld flange of non-stainless alloy steel for inserting pipe ends into recessed sockets before welding, common in power plant steam lines. HTS 7307.91.30.00 applies due to no post-forging processing, preserving raw forged texture. Offers fatigue resistance in cyclic pressure systems.
Rough Alloy Steel Orifice Flange Pair
Pair of forged alloy steel flanges (non-stainless) designed for mounting flow meters between them, used in metering stations for natural gas. Falls under HTS 7307.91.30.00 as rough-forged without machining. Provides accurate pressure differential measurement in pipelines.
Basic Forged Alloy Steel Lap Joint Flange
Forged lap joint flange from alloy steel (not stainless) used with stub ends for easy alignment in low-pressure water systems. HTS 7307.91.30.00 due to unprocessed forged state, rough edges intact. Allows rotation for bolt alignment during installation.
Unmachined Alloy Steel Long Weld Neck Flange
Long weld neck flange forged from non-stainless alloy steel for extreme high-pressure sour gas service. Classified HTS 7307.91.30.00 as no post-forging work done, rough neck intact. Extends hub reduces stress concentration at vessel connections.
Rough Forged Alloy Steel Reducing Flange
Reducing flange forged from alloy steel (except stainless) to connect differing pipe sizes in HVAC industrial ducts. HTS 7307.91.30.00 for unprocessed forging condition. Simplifies transitions without reducers.
Forged Non-Stainless Alloy Steel Raised Face Flange
Rough forged raised face flange of alloy steel for gasket sealing in compressor stations. Under HTS 7307.91.30.00 as forging only—no face machining performed. Ensures leak-tight seals under vibration.