ASTM A358
Basic Info
ASTM A358 covers electric-fusion-welded austenitic chromium-nickel stainless steel pipe suitable for corrosive or high-temperature service. This standard includes various grades and sizes of welded pipes used in industrial applications like chemical processing, water treatment, and oil refining. It ensures the integrity and reliability of welded stainless steel pipes.
Characteristics
Welded Construction: ASTM A358 covers electric-fusion-welded austenitic chromium-nickel stainless steel pipe, ensuring strong welded construction for structural integrity.
Corrosion Resistance: A358 pipes offer excellent resistance to corrosion, making them suitable for corrosive environments in industries such as chemical processing and oil refining.
High Strength: Stainless steel pipes conforming to A358 typically exhibit high strength, ensuring reliability under heavy loads and pressure.
Large Diameter Capability: The standard includes provisions for large diameter pipes, catering to various industrial piping requirements.
ASTM A358 Data Sheet
Steel Grade
Dimensions and Tolerances
Equivalent Grades
Chemical Composition
Mechanical Properties
Fabrication and Welding
Steel Grade
304/TP304
304L/TP304L
316/TP316
316L/TP316L
321/TP321
321H/TP321H
347/TP347
347H/TP347H
Dimensions and Tolerances
Nominal Pipe Size (NPS): 1/8″ to 5″ (10.3mm to 127mm)
Outside Diameter (OD): Up to 0.405″ (10.29mm)
Wall Thickness (WT): 0.035″ to 0.500″ (0.89mm to 12.70mm)
Tolerance on WT: ±12.5%
Nominal Pipe Size (NPS): 6″ to 18″ (168.3mm to 457mm)
Outside Diameter (OD): Up to 0.219″ (5.56mm)
Wall Thickness (WT): 0.035″ to 0.875″ (0.89mm to 22.23mm)
Tolerance on WT: +3.2mm/-0mm
Nominal Pipe Size (NPS): 20″ to 26″ (508mm to 660mm)
Outside Diameter (OD): Up to 0.250″ (6.35mm)
Wall Thickness (WT): 0.035″ to 1.000″ (0.89mm to 25.40mm)
Tolerance on WT: +4.8mm/-0mm
Nominal Pipe Size (NPS): 28″ to 40″ (711mm to 1016mm)
Outside Diameter (OD): Up to 0.312″ (7.92mm)
Wall Thickness (WT): 0.375″ to 1.000″ (9.53mm to 25.40mm)
Tolerance on WT: +4.8mm/-0mm
Nominal Pipe Size (NPS): 42″ to 60″ (1067mm to 1524mm)
Outside Diameter (OD): Up to 0.375″ (9.53mm)
Wall Thickness (WT): 0.375″ to 1.000″ (9.53mm to 25.40mm)
Tolerance on WT: +4.8mm/-0mm
Nominal Pipe Size (NPS): 64″ to 96″ (1626mm to 2438mm)
Outside Diameter (OD): Up to 0.375″ (9.53mm)
Wall Thickness (WT): 0.375″ to 1.000″ (9.53mm to 25.40mm)
Tolerance on WT: +4.8mm/-0mm
Equivalent Grades
United Kingdom
BS 3605 Pt.2 (Grade 304, 304L, 316, 316L, 321, 321H, 347, 347H, etc.)
European Union
EN 10217-7 (Grade 1.4301, 1.4306, 1.4401, 1.4404, 1.4541, 1.4550, etc.)
Japan
JIS G3468 (SUS304TP, SUS304LTP, SUS316TP, SUS316LTP, etc.)
Chemical Composition
304 (UNS S30400)
Carbon (C): 0.08 max
Manganese (Mn): 2.00 max
Phosphorus (P): 0.045 max
Sulfur (S): 0.030 max
Silicon (Si): 0.75 max
Chromium (Cr): 18.0–20.0
Nickel (Ni): 8.00–10.5
Molybdenum (Mo): –
Titanium (Ti): –
Niobium (Nb) + Tantalum (Ta): –
304L (UNS S30403)
Carbon (C): 0.03 max
Manganese (Mn): 2.00 max
Phosphorus (P): 0.045 max
Sulfur (S): 0.030 max
Silicon (Si): 0.75 max
Chromium (Cr): 18.0–20.0
Nickel (Ni): 8.00–12.0
Molybdenum (Mo): –
Titanium (Ti): –
Niobium (Nb) + Tantalum (Ta): –
316 (UNS S31600)
Carbon (C): 0.08 max
Manganese (Mn): 2.00 max
Phosphorus (P): 0.045 max
Sulfur (S): 0.030 max
Silicon (Si): 0.75 max
Chromium (Cr): 16.0–18.0
Nickel (Ni): 10.0–14.0
Molybdenum (Mo): 2.0–3.0
Titanium (Ti): –
Niobium (Nb) + Tantalum (Ta): –
316L (UNS S31603)
Carbon (C): 0.03 max
Manganese (Mn): 2.00 max
Phosphorus (P): 0.045 max
Sulfur (S): 0.030 max
Silicon (Si): 0.75 max
Chromium (Cr): 16.0–18.0
Nickel (Ni): 10.0–14.0
Molybdenum (Mo): 2.0–3.0
Titanium (Ti): –
Niobium (Nb) + Tantalum (Ta): –
321 (UNS S32100)
Carbon (C): 0.08 max
Manganese (Mn): 2.00 max
Phosphorus (P): 0.045 max
Sulfur (S): 0.030 max
Silicon (Si): 0.75 max
Chromium (Cr): 17.0–19.0
Nickel (Ni): 9.00–12.0
Molybdenum (Mo): –
Titanium (Ti): 5×(C+N) min or 0.70 max
Niobium (Nb) + Tantalum (Ta): –
321H (UNS S32109)
Carbon (C): 0.04–0.10
Manganese (Mn): 2.00 max
Phosphorus (P): 0.045 max
Sulfur (S): 0.030 max
Silicon (Si): 0.75 max
Chromium (Cr): 17.0–19.0
Nickel (Ni): 9.00–12.0
Molybdenum (Mo): –
Titanium (Ti): 4×(C+N) min or 0.70 max
Niobium (Nb) + Tantalum (Ta): –
347 (UNS S34700)
Carbon (C): 0.08 max
Manganese (Mn): 2.00 max
Phosphorus (P): 0.045 max
Sulfur (S): 0.030 max
Silicon (Si): 0.75 max
Chromium (Cr): 17.0–19.0
Nickel (Ni): 9.00–13.0
Molybdenum (Mo): –
Titanium (Ti): –
Niobium (Nb) + Tantalum (Ta): 10×(C+N) min or 1.00 max
347H (UNS S34709)
Carbon (C): 0.04–0.10
Manganese (Mn): 2.00 max
Phosphorus (P): 0.045 max
Sulfur (S): 0.030 max
Silicon (Si): 0.75 max
Chromium (Cr): 17.0–19.0
Nickel (Ni): 9.00–13.0
Molybdenum (Mo): –
Titanium (Ti): –
Niobium (Nb) + Tantalum (Ta): 8×(C+N) min or 1.00 max
Mechanical Properties
304 (UNS S30400)
Tensile Strength: 75 ksi (515 MPa) min
Yield Strength: 30 ksi (205 MPa) min
Elongation: 35% min
Hardness: 92 HRB max
304L (UNS S30403)
Tensile Strength: 70 ksi (485 MPa) min
Yield Strength: 25 ksi (170 MPa) min
Elongation: 35% min
Hardness: 92 HRB max
316 (UNS S31600)
Tensile Strength: 75 ksi (515 MPa) min
Yield Strength: 30 ksi (205 MPa) min
Elongation: 35% min
Hardness: 95 HRB max
316L (UNS S31603)
Tensile Strength: 70 ksi (485 MPa) min
Yield Strength: 25 ksi (170 MPa) min
Elongation: 35% min
Hardness: 95 HRB max
321 (UNS S32100)
Tensile Strength: 75 ksi (515 MPa) min
Yield Strength: 30 ksi (205 MPa) min
Elongation: 35% min
Hardness: 90 HRB max
321H (UNS S32109)
Tensile Strength: 70 ksi (485 MPa) min
Yield Strength: 25 ksi (170 MPa) min
Elongation: 35% min
Hardness: 90 HRB max
347 (UNS S34700)
Tensile Strength: 75 ksi (515 MPa) min
Yield Strength: 30 ksi (205 MPa) min
Elongation: 35% min
Hardness: 92 HRB max
347H (UNS S34709)
Tensile Strength: 75 ksi (515 MPa) min
Yield Strength: 30 ksi (205 MPa) min
Elongation: 35% min
Hardness: 92 HRB max
Fabrication and Welding
Heat Treatment
Annealing or stress-relieving heat treatment may be necessary after forming to restore material properties.
Forming
ASTM A358 stainless steel pipes can be readily formed by conventional methods such as bending and roll forming.
Machining
ASTM A358 pipes are generally machinable, but the high strength and hardness of some grades may require special tools and techniques.
Weldability
Excellent weldability using all standard fusion welding processes such as TIG (GTAW), MIG (GMAW), and SMAW (manual) welding.
Welding Precautions
Proper welding techniques and filler materials should be used to avoid hot cracking, especially in the heat-affected zone (HAZ). Preheating and post-weld heat treatment may be necessary for thicker sections or certain grades.
Welding Consumables
Recommended welding consumables include austenitic stainless steel filler metals such as ER308, ER316, or similar grades for matching chemistry and mechanical properties.
Welding Procedures
Welding procedures should be qualified according to ASME Boiler and Pressure Vessel Code (BPVC) Section IX or other applicable standards.
Post-Weld Cleaning
Proper cleaning and passivation of welded areas are essential to restore corrosion resistance and prevent contamination.
Guarding Against Corrosion: The Strength of ASTM A358 Stainless Steel
ASTM A358 stainless steel materials stand out for their exceptional corrosion resistance, making them an ideal choice for applications in demanding environments. Whether exposed to harsh chemicals, high temperatures, or corrosive atmospheres, ASTM A358 materials offer superior protection against corrosion, ensuring longevity and reliability. This corrosion resistance not only enhances the durability of the materials but also reduces the need for frequent maintenance and replacement, ultimately resulting in cost savings for businesses. Whether used in chemical processing plants, offshore oil rigs, food processing facilities, or pharmaceutical cleanrooms, ASTM A358 materials provide peace of mind, knowing that critical components will withstand the corrosive effects of their operating environments. With ASTM A358 materials, customers can trust in the long-term performance and integrity of their equipment, even in the harshest conditions, making them a preferred choice for industries where corrosion resistance is paramount.
