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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If made from stainless steel
Chapter notes separate stainless for its distinct metallurgical properties and corrosion applications.
If tooled or machined for threading
Threaded flanges require precision processing, falling under finished goods subheadings.
If designed specifically as gas turbine parts
End-use in machinery like turbines reclassifies under Chapter 84 for functional components.
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Import Tips & Compliance
• Label clearly as 'alloy steel, not stainless' with chemical analysis to prevent reclassification to stainless headings
• Document weight and dimensions accurately; overweight shipments may trigger anti-dumping scrutiny on steel products
Related Products 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.
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.