ASTM A403
Basic Info
ASTM A403 covers the standard specification for wrought austenitic stainless steel piping fittings for pressure piping applications. This standard includes various types of fittings such as elbows, tees, reducers, and caps used in piping systems for industries like oil and gas, chemical processing, and food processing. It ensures the quality and compatibility of stainless steel fittings with different piping systems.
Characteristics
Diverse Fitting Types: ASTM A403 covers wrought austenitic stainless steel piping fittings, including elbows, tees, reducers, and caps, providing a wide range of options for piping systems.
Corrosion Resistance: A403 fittings offer excellent corrosion resistance, ensuring longevity and reliability in corrosive environments.
High Strength: Stainless steel fittings conforming to A403 typically exhibit high strength, contributing to the structural integrity of piping systems.
Dimensional Accuracy: The standard ensures precise dimensional control of stainless steel fittings, crucial for compatibility and leak-free connections in piping systems.
ASTM A403 Data Sheet
Steel Grade
Dimensions and Tolerances
Equivalent Grades
Chemical Composition
Mechanical Properties
Fabrication and Welding
Steel Grade
WP304
WP316
WP321
Dimensions and Tolerances
WP304 (Seamless and Welded)
Shape: Seamless and Welded
Size Range (NPS): 1/2 – 24 (Seamless), 1/2 – 48 (Welded)
Outside Diameter (OD): 0.840 – 24.000 (Seamless), 0.840 – 48.000 (Welded)
Wall Thickness (T): 0.109 – 1.000
Center-to-End (C): As per ASME B16.9
Center-to-End 45° (M): As per ASME B16.9
Center-to-End 90° (P): As per ASME B16.9
Center-to-End 180° (R): As per ASME B16.9
Outlet: Not applicable
Tolerances (unit: inch): ±1% or ±0.5mm, whichever is greater
WP316 (Seamless and Welded)
Shape: Seamless and Welded
Size Range (NPS): 1/2 – 24 (Seamless), 1/2 – 48 (Welded)
Outside Diameter (OD): 0.840 – 24.000 (Seamless), 0.840 – 48.000 (Welded)
Wall Thickness (T): 0.109 – 1.000
Center-to-End (C): As per ASME B16.9
Center-to-End 45° (M): As per ASME B16.9
Center-to-End 90° (P): As per ASME B16.9
Center-to-End 180° (R): As per ASME B16.9
Outlet: Not applicable
Tolerances (unit: inch): ±1% or ±0.5mm, whichever is greater
WP321 (Seamless and Welded)
Shape: Seamless and Welded
Size Range (NPS): 1/2 – 24 (Seamless), 1/2 – 48 (Welded)
Outside Diameter (OD): 0.840 – 24.000 (Seamless), 0.840 – 48.000 (Welded)
Wall Thickness (T): 0.109 – 1.000
Center-to-End (C): As per ASME B16.9
Center-to-End 45° (M): As per ASME B16.9
Center-to-End 90° (P): As per ASME B16.9
Center-to-End 180° (R): As per ASME B16.9
Outlet: Not applicable
Tolerances (unit: inch): ±1% or ±0.5mm, whichever is greater
Note:
1. NPS stands for Nominal Pipe Size.
2. Tolerances are provided for outside diameter (OD), wall thickness (T), and other dimensions as specified.
Equivalent Grades
Germany (DIN)
Equivalent steel grades of ASTM A403 are DIN 1.4301, DIN 1.4401, DIN 1.4541.
Japan (JIS)
Equivalent steel grades of ASTM A403 are JIS SUS304, JIS SUS316, JIS SUS321.
United Kingdom (BS)
Equivalent steel grades of ASTM A403 are BS 304S31, BS 316S31, BS 321S31.
Chemical Composition
WP304 (S30400)
Carbon (C), max: 0.08
Manganese (Mn), max: 2
Phosphorus (P), max: 0.045
Sulfur (S), max: 0.03
Silicon (Si), max: 0.75
Nickel (Ni): 8.0 – 11.0
Chromium (Cr): 18.0 – 20.0
Molybdenum (Mo): –
Nitrogen (N): –
WP316 (S31600)
Carbon (C), max: 0.08
Manganese (Mn), max: 2
Phosphorus (P), max: 0.045
Sulfur (S), max: 0.03
Silicon (Si), max: 0.75
Nickel (Ni): 10.0 – 14.0
Chromium (Cr): 16.0 – 18.0
Molybdenum (Mo): 2.0 – 3.0
Nitrogen (N): –
WP321 (S32100)
Carbon (C), max: 0.08
Manganese (Mn), max: 2
Phosphorus (P), max: 0.045
Sulfur (S), max: 0.03
Silicon (Si), max: 0.75
Nickel (Ni): 9.0 – 12.0
Chromium (Cr): 17.0 – 19.0
Molybdenum (Mo): –
Nitrogen (N): –
Mechanical Properties
WP304
Tensile Strength (MPa): 515 min
Yield Strength 0.2% Offset (MPa): 205 min
Elongation (%): 35 min
Reduction of Area (%): 50 min
Hardness (Brinell): 201 max
Hardness (Rockwell B): 92 max
WP316
Tensile Strength (MPa): 515 min
Yield Strength 0.2% Offset (MPa): 205 min
Elongation (%): 35 min
Reduction of Area (%): 50 min
Hardness (Brinell): 217 max
Hardness (Rockwell B): 95 max
WP321
Tensile Strength (MPa): 515 min
Yield Strength 0.2% Offset (MPa): 205 min
Elongation (%): 35 min
Reduction of Area (%): 50 min
Hardness (Brinell): 217 max
Hardness (Rockwell B): 95 max
Fabrication and Welding
Forming
ASTM A403 stainless steel can be cold worked and hot formed.
Cold working operations such as bending, drawing, and pressing are commonly used to shape the material.
In hot forming processes like forging or extrusion, careful temperature control is necessary to avoid cracking and ensure good grain structure and corrosion resistance.
Machining
ASTM A403 stainless steel can be machined using conventional methods such as turning, milling, drilling, and grinding.
Carbide tooling is recommended for machining operations.
Monitoring the speed, feed, and cooling fluid during machining helps prevent tool wear and maintains surface quality.
Welding
ASTM A403 stainless steel is readily weldable using common techniques such as TIG (Tungsten Inert Gas), MIG (Metal Inert Gas), and SMAW (Shielded Metal Arc Welding).
Preheating may be necessary in some cases, particularly for thicker materials.
Post-weld heat treatment (PWHT) may be required depending on the grade and application to restore mechanical properties and minimize residual stresses.
Selection of filler materials should ensure compatibility with the base metal to achieve desired mechanical properties and corrosion resistance.
Post-Weld Cleaning and Finishing
After welding, thorough cleaning of weld areas is necessary to remove any contaminants such as oxides, scale, or slag to avoid corrosion and improve aesthetics.
Surface treatments like passivation, pickling, or grinding may be applied to enhance corrosion resistance and remove surface imperfections.
Inspection and Quality Control
Non-destructive testing (NDT) methods such as visual inspection, dye penetrant testing, or ultrasonic testing are commonly applied to ensure weld integrity and compliance with ASTM A403 specifications.
Material verification and quality assurance processes help ensure that the fabricated parts meet all required standards and specifications.
Safeguard Your Investments: The Stainless Shield of ASTM A403 Materials
Discover unparalleled durability with ASTM A403 stainless steel materials renowned for their exceptional corrosion resistance. Engineered to withstand harsh environments and corrosive substances, these alloys provide long-lasting reliability in diverse applications. From corrosive chemicals to extreme temperatures, ASTM A403 materials offer steadfast protection against degradation, ensuring the integrity of your equipment and structures over time.
Investing in ASTM A403 stainless steel means investing in peace of mind, knowing that your assets are safeguarded against the ravages of corrosion. Whether you’re in the oil and gas industry, chemical processing, or food manufacturing, the unmatched corrosion resistance of ASTM A403 materials ensures optimal performance and longevity. Say goodbye to costly maintenance and downtime caused by corrosion-related issues, and embrace the durability and reliability of ASTM A403 stainless steel for your critical projects.
