Product Parameters
| Item | Specification |
|---|---|
| Pressure Class | Class 150 – Class 2500 |
| Standards | ASME B16.5, B16.47 |
| Material | A105 Carbon Steel, A182 F22/F91 Chrome-Moly, A182 F304/F316 Stainless |
| Face Config | Flat Face, Raised Face, RTJ, T&G |
| Size Range | 1/2" – 60" |
| MOQ | 10 pcs |
description
Steel pipe flanges show up in chemical plants, oil and gas facilities, and power plants - anywhere you need to make a leak-tight joint between pipe sections that can be taken apart later for maintenance. The flange face, bolt holes, and pressure rating all have to match the rest of the system.
Weld neck flanges are the standard for high-pressure and critical service. The tapered hub distributes the welding stress and reinforces the joint against fatigue from pressure cycling. Slip-on and socket weld flanges work for lower-pressure applications where cost is watched more closely.
A105 forged carbon steel handles most general service. A182 F22 and F91 chrome-moly are the choice for high-temperature refinery and power work - above 450°C these alloys hold up where carbon steel would soften. A182 F304/F316 stainless when the media would attack carbon steel.
Flange Face Types - Choosing the Right One
FAQ
Q1: MOQ?
A1: 10 pieces.
Q2: Pressure classes?
A2: Class 150 through Class 2500 per ASME B16.5.
Q3: Materials?
A3: A105 carbon steel, A182 F22/F91 chrome-moly, A182 F304/F316 stainless.
Q4: Non-standard flanges?
A4: Yes. Custom materials, non-standard ratings, special face-to-face dimensions.
Q5: Material test reports?
A5: Yes. Material certificates and heat treatment reports included with every shipment.
Quality is non-negotiable in precision manufacturing. Every component undergoes rigorous inspection at each stage of production.
- ISO 9001:2015 - Quality management system covering design and manufacturing
- API 6D / API 600 - Design and testing compliance for valve components and flanges
- Hydrostatic Pressure Testing - Every valve body pressure-tested to 1.5× rated pressure
- MPI / LPI - Magnetic particle and liquid penetrant inspection for weld integrity
- CE / ATEX - Pressure equipment directive compliance for EU market available
- Passivation / Electropolishing - ASTM A967 procedures for corrosion resistance
- Material Traceability - Heat number tracking from raw material to finished part
From raw material to finished product, every step is controlled and documented:
- Pattern Making - Wooden or metal pattern fabrication for sand/centrifugal/investment casting
- Molding - Sand casting, shell mold, centrifugal, or lost-wax investment casting setup
- Melting & Pouring - Controlled furnace melting with chemistry and temperature monitoring
- Solidification & Shakeout - Controlled cooling with riser/removal and core shakeout
- Heat Treatment - Annealing, normalizing, or solution treatment per specification
- Machining - CNC machining, drilling, and tapping to final dimensions
- Surface Treatment - Grinding, welding, or coating as required
- Inspection & Testing - Dimensional, visual, hydrostatic, or NDT inspection
- Cleaning & Packaging - Sand removal, degreasing, rust prevention, and packaging
Hot Tags: steel pipe flanges, China steel pipe flanges manufacturers, flanges and couplings, Sleeve Couplings, Slip On Flanges, Solid Couplings