ASTM A789
Characteristics
High Resistance to Corrosion: Suitable for use in aggressive environments such as seawater and chemical processing industries.
Pressure and Temperature Resistance: Capable of withstanding high pressure and temperature conditions encountered in various applications.
ASTM A789 Data Sheet
Steel Grade
Dimensions and Tolerances
Equivalent Grades
Chemical Composition
Mechanical Properties
Steel Grade
S31803
S32205
S32750
S32900
Dimensions and Tolerances
Round
Dimensions:
OD: 1/8″ to 12″ (3.2mm to 304.8mm)
Wall Thickness: 0.015″ to 0.25″ (0.38mm to 6.35mm)
Tolerances:
OD: ±0.005″ (±0.13mm) for sizes up to 1″ (25.4mm)
OD: ±1% for sizes > 1″ (25.4mm)
WT: ±10%
Rectangle
Dimensions:
Width: 0.5″ to 8″ (12.7mm to 203.2mm)
Height: 0.25″ to 6″ (6.35mm to 101.6mm)
Wall Thickness: 0.015″ to 0.25″ (0.38mm to 6.35mm)
Tolerances:
Width: ±0.015″ (±0.38mm)
Height: ±0.010″ (±0.25mm)
WT: ±10%
Square
Dimensions:
Size: 0.5″ to 8″ (12.7mm to 203.2mm)
Wall Thickness: 0.015″ to 0.25″ (0.38mm to 6.35mm)
Tolerances:
Size: ±0.015″ (±0.38mm)
WT: ±10%
Equivalent Grades
USA: ASTM A789
United Kingdom: BS 3605-2
Germany: DIN 17458
Japan: JIS G3463
Chemical Composition
Carbon (C), max
For Grade S31803, the maximum carbon content is 0.03.
For Grade S32205, the maximum carbon content is 0.03.
For Grade S32750, the maximum carbon content is 0.03.
For Grade S32760, the maximum carbon content is 0.03.
Manganese (Mn), max
For Grade S31803, the maximum manganese content is 2.
For Grade S32205,the maximum manganese content is 2.
For Grade S32750, the maximum manganese content is 1.
For Grade S32760, the maximum manganese content is 1.
Phosphorus (P), max
For Grade S31803, the maximum phosphorus content is 0.03.
For Grade S32205, the maximum phosphorus content is 0.03.
For Grade S32750, the maximum phosphorus content is 0.03.
For Grade S32760, the maximum phosphorus content is 0.03.
Sulfur (S), max
For Grade S31803, the maximum sulfur content is 0.02.
For Grade S32205, the maximum sulfur content is 0.02.
For Grade S32750, the maximum sulfur content is 0.02.
For Grade S32760, the maximum sulfur content is 0.01.
Silicon (Si), max
For Grade S31803, the maximum silicon content is 1.
For Grade S32205, the maximum silicon content is 1.
For Grade S32750, the maximum silicon content is 0.8.
For Grade S32760, the maximum silicon content is 1.
Chromium (Cr)
For Grade S31803, the chromium content ranges from 21.0 to 23.0.
For Grade S32205, the chromium content ranges from 22.0 to 23.0.
For Grade S32750, the chromium content ranges from 24.0 to 26.0.
For Grade S32760, the chromium content ranges from 24.0 to 26.0.
Nickel (Ni)
For Grade S31803, the nickel content ranges from 4.5 to 6.5.
For Grade S32205, the nickel content ranges from 4.5 to 6.5.
For Grade S32750, the nickel content ranges from 6.0 to 8.0.
For Grade S32760, the nickel content ranges from 6.0 to 8.0.
Molybdenum (Mo)
For Grade S31803, the molybdenum content ranges from 2.5 to 3.5.
For Grade S32205, the molybdenum content ranges from 3.0 to 3.5.
For Grade S32750, the molybdenum content ranges from 3.0 to 5.0.
For Grade S32760, the molybdenum content ranges from 3.0 to 4.0.
Nitrogen (N)
For Grade S31803, the nitrogen content ranges from 0.08 to 0.20.
For Grade S32205, the nitrogen content ranges from 0.14 to 0.20.
For Grade S32750, the nitrogen content ranges from 0.24 to 0.32.
For Grade S32760, the nitrogen content ranges from 0.2 to 0.3.
Mechanical Properties
Tensile Strength
S31803: 620 MPa (90 ksi) min
S32205: 655 MPa (95 ksi) min
S32750: 800 MPa (116 ksi) min
S32760: 750 MPa (109 ksi) min
Yield Strength
S31803: 450 MPa (65 ksi) min
S32205: 450 MPa (65 ksi) min
S32750: 550 MPa (80 ksi) min
S32760: 550 MPa (80 ksi) min
Elongation
S31803: 25% min
S32205: 25% min
S32750: 15% min
S32760: 25% min
Hardness
S31803: Not specified
S32205: Not specified
S32750: Not specified
S32760: Not specified
Rockwell Hardness (HRB)
S31803: 290 max
S32205: 290 max
S32750: Not specified
S32760: Not specified
Rockwell Hardness (HRC)
S31803: 30 max
S32205: 30 max
S32750: Not specified
S32760: Not specified
ASTM A789 materials offer unparalleled corrosion resistance, making them a top choice for critical applications in aggressive environments. Whether facing the corrosive effects of seawater, acidic chemicals, or high temperatures, these duplex stainless steels provide reliable protection against degradation and maintain structural integrity over extended periods. Their unique composition, featuring a balanced combination of chromium, nickel, and molybdenum, forms a passive oxide layer on the surface, effectively shielding against corrosion and pitting. This superior corrosion resistance not only ensures prolonged service life but also minimizes maintenance costs and downtime, making ASTM A789 materials the preferred solution for industries ranging from offshore oil and gas to chemical processing and marine engineering. Customers can trust in the long-term performance and durability of ASTM A789 materials, even in the harshest operating conditions, safeguarding their investments and ensuring operational excellence.
