ASTM A182 F304 / F304L Stainless Steel Flanges Manufacturer & Supplier
We are a professional manufacturer and global exporter of ASTM A182 F304 and F304L stainless steel flanges, available in a wide variety of types including Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), and Threaded (TH) flanges.
ASTM A182 / A182M – Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
Download ASTM A182 2024 pdf
ASTM A182 covers:
- Forged or rolled alloy steel materials
- For use in pressure systems and high-temperature services
- Commonly applied in:
- Petrochemical plants
- Oil & gas processing
- Power generation (thermal, nuclear)
- Marine and offshore industries
ASTM A182 Flange Types Available
ASTM A182 alloy steel flanges are manufactured in compliance with:
- Specifications: ASTM A182 / ASME SA182
- Dimensions: ASME B16.5, B16.47, DIN, EN1092-1, BS4504
- Size Range: ½” to 48” (DN15–DN1200)
- Face Type: RF (Raised Face), FF (Flat Face), RTJ (Ring-Type Joint)
Available types:
- ASTM A182 F304/304L Weld Neck Flange (WN)
- ASTM A182 F304/304L Blind Flange (BL)
- ASTM A182 F304/304L Slip-On Flange (SO)
- ASTM A182 F304/304L Socket Weld Flange (SW)
- ASTM A182 F304/304L Threaded Flange (TH)
- Lap Joint Flange (LJ)
- Orifice Flanges
SS304 stainless steel is the most common austenitic stainless steel. It is an alloy of iron, carbon, chromium and nickel. There are 2 grade in SS304.ASTM A182 F304” and “ASTM A182 F304L” ,They are the same material grade level,but the only difference in the compostion is that,304L with a lower carbon content,We can supply A182 F304/F304L dual grade flanges.
F304 is a standard 18/8 stainless steel (18% Cr, 8% Ni) with good corrosion resistance and strength.
F304L is the low-carbon version of F304, ideal for welded applications to avoid carbide precipitation and intergranular corrosion.
ASTM A182 is the a standard Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service.
Chemical Composition of A182 F304/F304L
| Material | C | Mn | P | S | Si | Ni | Cr |
| A182 F304 | Max 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-11.0 | 18.0-20.0 |
| A182 F304L | Max 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-13.0 | 18.0-20.0 |
Tensile and hardness requirement of A182 F304/F304L
| Property | F304 | F304L |
|---|---|---|
| Tensile Strength | ≥515 MPa | ≥485 MPa |
| Yield Strength | ≥205 MPa | ≥170 MPa |
| Elongation | ≥30% | ≥30% |
| Hardness (HB) | ≤192 | ≤192 |
ASTM A182 304/304L Flange Manufacture
The stainless steels shall be melted by one of the following processes: (a) electric-furnace (with the option of separate degassing and refining processes); (b) vacuumfurnace; or (c) one of the former followed by vacuum or electroslag-consumable remelting
ASTM A182 304/304L Flange Heat treatment
| Grade | UNS | C | Mn | P | S | Si | Cr | Ni | Cooling Media | Quenching Cool Below °F [°C] | Tempering Temperature, Minimum or Range, °F [°C] | Heat Treat Type | Austenitizing/Solution Heat Treatment Temperature, Minimum or Range, °F [°C]⁴ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| F 304 | S30400 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0 – 11.0 | 18.0 – 20.0 | … | … | … | … | N 0.10 |
| F 304H | S30409 | 0.04 – 0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0 – 11.0 | 18.0 – 20.0 | … | … | … | … | … |
| F 304L | S30403 | 0.030 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0 – 13.0 | 18.0 – 20.0 | … | … | … | … | N 0.10 |
Testing & Certification of A182 F304/304L flanges
Third-party inspection: SGS, BV, TUV available
100% PMI (Positive Material Identification)
Hydrostatic Pressure Testing
UT / RT / PT / MPT as per customer request
EN 10204 3.1 / 3.2 MTC provided
A182 304/304L flanges Marking Requirements
Each flange is marked with:
- ASTM A182
- Grade ( F304/304L)
- Heat number
- Pressure rating (e.g., 300#)
- Manufacturer’s logo
- Size and schedule
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