ASTM A182 F321 / F321H Forging Specification

ASTM A182 F321 / F321H Forging Specification for Flanges & Fittings

Stabilized Austenitic Stainless Steel F321 & F321H Forgings | Technical Specification PDF Download

The ASTM A182 F321 / F321H Forging Specification PDF provides a comprehensive technical reference for stabilized 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 high-temperature and corrosive service environments.

ASTM A182 Standard Overview:

ASTM A182 is the standard specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves, and parts intended 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 F321 and F321H are titanium-stabilized austenitic stainless steel forging grades covered under ASTM A182.

Material Grades: ASTM A182 F321 & F321H

  • Standard: ASTM A182 / ASME SA182

  • Grades: F321, F321H

  • Material Type: Austenitic Stainless Steel (Titanium Stabilized)

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

  • UNS Numbers:

    • F321: UNS S32100

    • F321H: UNS S32109

F321H has a higher carbon content than F321, providing improved strength for elevated-temperature service.

ASTM A182 F321 Flanges Equivalent
Trade Name
Grade
UNS #
Flanges
321
F321
S32100
A182 / SA182
321H
F321H
S32109
A182 / SA182

Chemical Composition (Typical, %)

C Mn Si P S Cr N Ni Ti
0.08max 2.0 max 1.0 max 0.045 max 0.030 max 17.00 – 19.00 0.10 max 9.00 – 12.00 5(C+N) – 0.70

Mechanical Properties

Tensile Strength (MPa) min Elongation (% in 50mm) min Yield Strength 0.2% Proof (MPa) min Hardness
Rockwell B (HR B) max Brinell (HB) max
515 40 205 95 217

F321H

  • Carbon (C): 0.04 – 0.10

  • Other elements: Same as F321

Chemical composition limits are defined by ASTM A182.

Heat Treatment

ASTM A182 F321 / F321H forgings are supplied in the solution-annealed condition. Proper heat treatment ensures optimal corrosion resistance, ductility, and mechanical performance, particularly for high-temperature service.

Manufacturing Process

ASTM A182 F321 / F321H stainless steel forgings are manufactured by:

  • Hot forging or rolling

  • Solution annealing

  • Machining of flanges and fittings (if required)

  • Final inspection and testing

The forging process ensures refined grain structure and excellent mechanical integrity.

Produtct type and standard

Dimensions of ASTM A182 F321 / F321H 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 F321 / F321H 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.

Applications

  • High-Temperature Piping Systems

  • Petrochemical & Chemical Processing

  • Power Generation

  • Heat Exchangers

  • Pressure Vessels and Valves

  • Industrial Piping and Equipment

ASTM A182 F321 / F321H forgings are widely used where resistance to intergranular corrosion and high-temperature strength are required.

Download ASTM A182 F321 / F321H Forging Specification PDF

Download the complete ASTM A182 F321 / F321H Forging Specification PDF, including chemical composition limits, mechanical requirements, heat treatment conditions, and testing procedures.

👉 Download ASTM A182 F321 Forging Specification

👉 Download ASTM A182 Standard Specification PDF

Products

ASTM A182 F321 Weld Neck Flanges

ASTM A182 F321H Weld Neck Flanges
ASTM A182 F321 Blind Flages
ASME SA182 F321H Flanges