ASTM A182 F304 / F304L Forging Specification | Flanges Fittings

ASTM A182 F304 / F304L Forging Specification | Flanges Fittings

The ASTM A182 F304 / F304L Forging Specification PDF provides a comprehensive technical reference for austenitic stainless steel forgings used for pipe flanges, forged fittings, valves, and pressure components. This specification covers chemical composition, mechanical properties, heat treatment requirements, manufacturing process, dimensions and tolerances, testing and inspection, and typical applications in chemical, petrochemical, power generation, and industrial piping systems.

ASTM A182 Standard

ASTM A182 is the standard specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves, and parts for high-temperature and corrosive service. Materials produced to ASTM A182 are designed to provide reliable mechanical strength, corrosion resistance, and long-term performance in pressure service applications.

Grades F304 and F304L are among the most widely used austenitic stainless steel forging grades covered by ASTM A182.

ASTM A182 F304 & F304L Material

  • Standard: ASTM A182 / ASME SA182

  • Grades: F304, F304L

  • Material Type: Austenitic Stainless Steel

  • Product Form: Forgings for Flanges, Fittings, Valves, and Components

  • UNS Numbers:

    • F304: UNS S30400

    • F304L: UNS S30403

F304L has a lower carbon content than F304, offering improved resistance to intergranular corrosion after welding.

Chemical Composition

Steel Grade C(Max) Si(Max) Mn(Max) P(Max) S(Max) Ni Cr N
F304 0.08 0.75 2.00 0.045 0.03 8.0–10.5 18.0–20.0 0.1
F304L 0.03 0.75 2.00 0.045 0.03 8.0–12.0 18.0–20.0 0.1

Chemical composition limits are defined by ASTM A182.

Mechanical Properties

Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness
Rockwell B (HR B) max Brinell (HB) max
F304 515 205 40 92 201
F304L 485 170 40 92 201

Heat Treatment

ASTM A182 F304 / F304L forgings are supplied in the solution-annealed condition. Proper heat treatment ensures optimal corrosion resistance, ductility, and mechanical performance.

Manufacturing Process

ASTM A182 F304 / F304L stainless steel forgings are manufactured by:

  • Hot forging or rolling

  • Solution annealing

  • Machining of flanges, fittings, and components (if required)

  • Final inspection and testing

The forging process provides refined grain structure and improved structural integrity.

Standard Products

Dimensions of ASTM A182 F304 / F304L forgings depend on the product type and applicable dimensional standards, such as:

  • ASME B16.5 / ASME B16.47 for pipe flanges

  • ASME B16.11 for forged fittings

  • Project-specific drawings for custom components

Dimensional controls typically include outside diameter, thickness, bore size, facing finish, and machining tolerances.

Testing & Inspection

Each ASTM A182 F304 / F304L forging may be subjected to:

  • Chemical analysis

  • Tensile testing

  • Hardness testing

  • Non-destructive testing (UT / PT, if specified)

  • Dimensional and visual inspection

Mill Test Certificates in accordance with EN 10204 3.1 are typically supplied.

Download ASTM A182 F304 / F304L Forging Specification PDF

Download the complete ASTM A182 F304 / F304L Forging Specification PDF, including chemical composition limits, mechanical requirements, heat treatment conditions, and testing procedures.

👉 download astm_a182_f304_f304l_forging_specification_flanges_fitting

Want to learn complete ASTM A182 specification,Please check below

👉 Download ASTM A182 standard specification

Related Products

ASTM A182 F304/304L Weld neck flanges
ASTM A182 F304/304L Slip in Flanges
ASTM A182 F304 F304L Blind Flanges
ASME SA182 F304L Forgings