ASTM A182 F304L Material: Composition, Properties and Applications
Nov 11, 2025
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What Is A182 F304L Material?
A182 F304L is a low-carbon austenitic stainless steel grade primarily used for forged components such as flanges, fittings, valves, and pressure vessel parts. It is manufactured in accordance with the ASTM A182 standard, which covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves for high-temperature service.
Because of its excellent corrosion resistance, weldability, and low carbon content, A182 F304L is widely used in chemical, petrochemical, power generation, and food processing industries.
Chemical Composition of A182 F304L Flanges
|
Element
|
Composition (%)
|
|---|---|
|
Carbon (C)
|
≤0.030%
|
|
Chromium (Cr)
|
18.0 – 20.0
|
|
Nickel (Ni)
|
8.0 – 12.0
|
|
Manganese (Mn)
|
≤ 2.0
|
|
Silicon (Si)
|
≤ 1.0
|
|
Phosphorus (P)
|
≤ 0.045
|
|
Sulfur (S)
|
≤ 0.03
|
|
Iron (Fe)
|
Balance
|
Equivalent Grades of ASTM A182 F304L forged flange
|
Standard
|
Grade |
|---|---|
| UNS | S30403 |
| ASTM A182 | F304L |
| EN | 1.4307 / X2CrNi18‑9; 1.4306 / X2CrNi19‑11 |
| JIS | SUS304L |
| GB‑China | 022Cr19Ni10 (S30403) |
Mechanical Properties of ASTM A182 F304L forged flange
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | ≥ 485 MPa | ≥ 70 ksi |
| Yield Strength (0.2% offset) | ≥ 170 MPa | ≥ 25 ksi |
| Elongation | ≥ 35% | ≥ 35% |
| Hardness (Brinell) | ≤ 192 HB | ≤ 192 HB |
Physical Properties of ASTM A182 F304L forged flange
| Property | Typical Value | Remarks |
|---|---|---|
| Density | 8.00 g/cm³ | At 20℃ |
| Melting Range | 1400‑1450 ℃ | |
| Tensile Modulus of Elasticity | 193 GPa | Room temperature |
| Specific Heat Capacity | 500 J/(kg·℃) | 20‑100℃ |
| Thermal Conductivity | 16.2 W/(m·K) | Measured at 100℃ |
| Mean Coefficient of Linear Thermal Expansion | 17.2×10⁻⁶ /℃ | 20‑100℃ |
| Electrical Resistivity | 0.72 μΩ·m | At 20℃ |
| Magnetic Property | Essentially non‑magnetic in solution‑annealed condition | Slight magnetism after cold‑working |
Key Characteristics of A182 F304L
1.What is the core advantage of A182 F304L flanges during welding?
A182 F304L is an ultra-low carbon stainless steel with a maximum carbon content of 0.03%. It effectively prevents chromium carbide precipitation during welding and significantly reduces the risk of post-weld intergranular corrosion. Solution annealing after welding is unnecessary for most working conditions, which simplifies construction procedures and lowers overall project costs.
2.What are the benefits of forged A182 F304L flanges compared with cast flanges?
Manufactured by integral forging technology, these flanges feature a uniform, dense grain structure with no internal defects such as pores, slag inclusions or looseness. They deliver superior pressure resistance, fatigue performance and anti-alternating load capacity than cast flanges, providing higher stability and reliability for high-pressure fluid pipeline systems.
3. How compatible are A182 F304L flanges with piping systems?
A182 F304L flanges offer excellent compatibility and perfectly match TP304L stainless steel pipes. Available in multiple types including weld neck, slip-on, blind and threaded flanges, they comply with ASME B16.5 and B16.47 standards and cover a full range of pressure classes, meeting diverse standardized piping project requirements.
Applications of A182 F304L
3.Food, Beverage & Pharmaceutical Industry: Forged parts, valves and flanges for hygienic process systems to meet sanitary‑grade equipment requirements.
4.Oil & Gas General‑service Conditions: Forged fittings and pipe joints for non‑high‑temperature, low‑corrosion process pipelines.
5.New‑energy Industry: Flanges and forged pipe fittings for fluid systems of lithium‑battery and photovoltaic projects.
6.Environmental Desulfurization & Denitrification Equipment: Low‑pressure flanges and forged connectors for flue‑gas treatment units. 7.General‑industrial Pressure‑vessel Accessories: Pressure‑vessel flanges and nozzle forgings for equipment where post‑weld heat treatment is impractical.
Forged flanges for chemical‑processing equipment
Stainless Steel Flanges and Fittings for Fluid Piping Systems
Large‑diameter flange connectors
If you are looking for A182 F304L stainless steel materials, Gnee can provide precisely cut, polished, and certified products that meet your project requirements.
ASTM A182 F304L Material vs. A182 F304
The main difference is carbon content: A182 F304L has a maximum of 0.030% carbon versus 0.08% for A182 F304. The lower carbon content makes F304L more resistant to intergranular corrosion after welding, at slightly lower strength. Therefore F304L suits welding applications, while F304 suits general-purpose applications where welding is not the primary consideration
FAQ
1.Is A182 F304L magnetic?
It is generally non-magnetic in the annealed condition but may become slightly magnetic after cold working.
2.Can A182 F304L be used in seawater applications?
It resists mild marine environments, but for prolonged seawater exposure, 316L or duplex grades are preferred.
3.What is the difference between A182 F304L and A182 F304 forged flange?
F304L is extra‑low‑carbon grade (C ≤0.03%), greatly reducing intergranular corrosion risk after welding. F304 has higher carbon content. F304L is preferred for welding‑heavy piping systems; F304 is suitable for non‑welded general‑service conditions.
4. Forged flange vs cast flange, which one to pick?
Forged flanges have denser grain structure, fewer internal defects and better pressure‑bearing & anti‑fatigue performance. For pressure‑piping systems, A182 forged flanges are strongly recommended over cast ones.
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