ASTM B725
ASTM B275 Basic Info
ASTM B725 holds significant importance in the realm of nickel-chromium-iron-molybdenum-copper alloys, specifically for welded pipe applications. This standard ensures the quality and reliability of welded pipes in critical industries such as chemical processing, petroleum, and marine engineering, where corrosion resistance and high-temperature performance are essential. By specifying rigorous requirements for material composition, manufacturing processes, and dimensional tolerances, ASTM B725 guarantees the integrity and performance of these pipes in demanding environments.
Characteristics of ASTM B725
- Corrosion Resistance: ASTM B725 steel exhibits exceptional resistance to corrosion, making it suitable for use in corrosive environments such as chemical processing plants, offshore oil platforms, and marine applications. The alloy compositions specified in ASTM B725 provide enhanced resistance to both general and localized corrosion, ensuring long-term durability and reliability.
- High-Temperature Performance: ASTM B725 steel maintains its structural integrity and mechanical properties even at elevated temperatures, making it suitable for applications involving high-temperature fluids or environments. Whether subjected to continuous operation at high temperatures or intermittent exposure to thermal cycling, ASTM B725 steel pipes offer consistent performance and reliability.
- Weldability and Formability: ASTM B725 steel is well-suited for welding and forming processes, allowing for the fabrication of complex piping systems and structures. The welding characteristics of ASTM B725 steel enable seamless integration into existing infrastructure and facilitate the construction of customized solutions tailored to specific project requirements. Additionally, the formability of ASTM B725 steel pipes allows for flexibility in design and installation, ensuring efficient and cost-effective implementation in various industrial applications.
ASTM B275 Data Sheet
Steel grade names
Dimensions and Tol.
Equivalent Steel Grades
Chemical Composition
Mechanical Properties
Fabrication and Welding
Steel grade names
Alloy 200:
- Alloy 200
- Alloy 201
- Alloy 400
Alloy 600:
- Alloy 600
- Alloy 625
- Alloy 800H
- Alloy 825
Alloy C276:
- Alloy C276
- Alloy C22
- Alloy C2000
Alloy B2:
- Alloy B2
- Alloy B3
Alloy G30:
- Alloy G30
- Alloy G35
Dimensions and Tol.
Round Pipes:
Outer Diameter: 0.405″ – 8.625″ (10.29 mm – 219.08 mm)
Thickness: Schedule 5S – Schedule XXS
±10% of specified wall thickness
Length: Random or Specific Lengths
Straightness: 1/8″ in any 5 ft (3.18 mm in any 1.5 m)
Ovality: Maximum of 2% of nominal diameter
Tolerance on Outside Diameter: ±1%
Tolerance on Wall Thickness: ±12.5%
Rectangular Pipes:
Width: Up to 12″ (304.8 mm)
Height: Up to 8″ (203.2 mm)
Thickness: Schedule 5S – Schedule XXS
±10% of specified wall thickness
Length: Random or Specific Lengths
Straightness: 1/8″ in any 5 ft (3.18 mm in any 1.5 m)
Corner Radius: Maximum of 1/8″ (3.18 mm)
Tolerance on Width: ±1%
Tolerance on Thickness: ±12.5%
Square Pipes:
Width: Up to 10″ (254 mm)
Thickness: Schedule 5S – Schedule XXS
±10% of specified wall thickness
Length: Random or Specific Lengths
Straightness: 1/8″ in any 5 ft (3.18 mm in any 1.5 m)
Corner Radius: Maximum of 1/8″ (3.18 mm)
Tolerance on Width: ±1%
Tolerance on Thickness: ±12.5%
Equivalent Steel Grades
United States:
Equivalent Grades: UNS N02200, UNS N02201, UNS N06001, UNS N06600, UNS N06625, UNS N08825, UNS N06002, UNS N10276, UNS N06200, UNS N08020, UNS N08330, UNS N10242, UNS N06686, UNS N10665, UNS N10675
Standard: ASTM B725, ASTM B730
Germany:
Equivalent Grades: 2.4060, 2.4061, 2.4360, 2.4856, 2.4851, 2.4858, 2.4819, 2.4816, 2.4610, 2.4602, 2.4617
Standard: DIN 17750, DIN 17752
Japan:
Equivalent Grades: JIS NW2200, JIS NW2201, JIS NW4400, JIS NW6600, JIS NW6625, JIS NW8825, JIS NW6022, JIS NW10276, JIS NW06200, JIS NW08020, JIS NW08330, JIS NW10242, JIS NW6686, JIS NW10665, JIS NW10675
Standard: JIS G3466, JIS G3459, JIS G3463
France:
Equivalent Grades: Nc N 02200, Nc N 02201, Nc Cr 15 Mo, Nc Cr 20 Mo, Nc Cr 25 Mo, Nc Cr Mo Cu, Nc Ni Mo Cu, Nc Ni Mo Cu 15
Standard: AFNOR NF A49-214, NF A49-215
Chemical Composition
UNS N02200 (Alloy 200):
- Carbon (C): 0.15 max
- Manganese (Mn): 0.35 max
- Phosphorus (P): 0.02 max
- Sulfur (S): 0.015 max
- Silicon (Si): 0.35 max
- Nickel (Ni): Balance
- Iron (Fe): 0.40 max
UNS N02201 (Alloy 201):
- Carbon (C): 0.02 max
- Manganese (Mn): 0.35 max
- Phosphorus (P): 0.02 max
- Sulfur (S): 0.015 max
- Silicon (Si): 0.35 max
- Nickel (Ni): Balance
- Iron (Fe): 0.40 max
UNS N06040 (Alloy 600):
- Carbon (C): 0.15 max
- Manganese (Mn): 1.0 max
- Phosphorus (P): 0.015 max
- Sulfur (S): 0.015 max
- Silicon (Si): 0.50 max
- Nickel (Ni): 63.0–70.0
- Iron (Fe): 6.0–10.0
- Chromium (Cr): 14.0–17.0
UNS N06600 (Alloy 625):
- Carbon (C): 0.10 max
- Manganese (Mn): 0.50 max
- Phosphorus (P): 0.015 max
- Sulfur (S): 0.015 max
- Silicon (Si): 0.50 max
- Nickel (Ni): 58.0 min
- Iron (Fe): 5.0 max
- Chromium (Cr): 20.0–23.0
- Molybdenum (Mo): 8.0–10.0
UNS N06625 (Alloy 625):
- Carbon (C): 0.10 max
- Manganese (Mn): 0.50 max
- Phosphorus (P): 0.015 max
- Sulfur (S): 0.015 max
- Silicon (Si): 0.50 max
- Nickel (Ni): 58.0 min
- Iron (Fe): 5.0 max
- Chromium (Cr): 20.0–23.0
- Molybdenum (Mo): 8.0–10.0
UNS N08020 (Alloy 825):
- Carbon (C): 0.05 max
- Manganese (Mn): 1.0 max
- Phosphorus (P): 0.045 max
- Sulfur (S): 0.03 max
- Silicon (Si): 0.5 max
- Nickel (Ni): 38.0–46.0
- Iron (Fe): Balance
- Chromium (Cr): 19.5–23.5
- Molybdenum (Mo): 2.5–3.5
- UNS N08600 (Alloy 600H):
- Carbon (C): 0.05–0.10 max
- Manganese (Mn): 1.0 max
- Phosphorus (P): 0.015 max
- Sulfur (S): 0.015 max
- Silicon (Si): 0.50 max
- Nickel (Ni): 30.0–35.0
- Iron (Fe): 30.5 min
- Chromium (Cr): 19.0–23.0
UNS N08031 (Alloy 31):
- Carbon (C): 0.015 max
- Manganese (Mn): 2.0 max
- Phosphorus (P): 0.015 max
- Sulfur (S): 0.010 max
- Silicon (Si): 0.50 max
- Nickel (Ni): Balance
- Iron (Fe): 4.0 max
- Chromium (Cr): 24.0–26.0
- Molybdenum (Mo): 6.0–8.0
UNS N08925 (Alloy C276):
- Carbon (C): 0.02 max
- Manganese (Mn): 1.0 max
- Phosphorus (P): 0.02 max
- Sulfur (S): 0.02 max
- Silicon (Si): 0.08 max
- Nickel (Ni): Balance
- Iron (Fe): 2.0 max
- Chromium (Cr): 20.0–22.5
- Molybdenum (Mo): 15.0–17.0
UNS N06200 (Alloy C22):
- Carbon (C): 0.015 max
- Manganese (Mn): 0.5 max
- Phosphorus (P): 0.025 max
- Sulfur (S): 0.02 max
- Silicon (Si): 0.08 max
- Nickel (Ni): Balance
- Iron (Fe): 2.0 max
- Chromium (Cr): 22.0–23.0
- Molybdenum (Mo): 13.0–15.0
Mechanical Properties
Alloy 200:
Tensile Strength: 380-550 MPa
Yield Strength (0.2% Offset): 105-150 MPa
Elongation: 40 min %
Alloy 201:
Tensile Strength: 415-550 MPa
Yield Strength (0.2% Offset): 140-175 MPa
Elongation: 40 min %
Alloy 400:
Tensile Strength: 480-620 MPa
Yield Strength (0.2% Offset): 170 min MPa
Elongation: 35 min %
Alloy 600:
Tensile Strength: 485-690 MPa
Yield Strength (0.2% Offset): 240 min MPa
Elongation: 30 min %
Alloy 625:
Tensile Strength: 827-1034 MPa
Yield Strength (0.2% Offset): 414 MPa
Elongation: 30 min %
Hardness: 197 max HV
Alloy 825:
Tensile Strength: 600 min MPa
Yield Strength (0.2% Offset): 275 min MPa
Elongation: 30 min %
Alloy 800H:
Tensile Strength: 450 min MPa
Yield Strength (0.2% Offset): 170 min MPa
Elongation: 30 min %
Alloy 800HT:
Tensile Strength: 450 min MPa
Yield Strength (0.2% Offset): 170 min MPa
Elongation: 30 min %
Alloy C276:
Tensile Strength: 550 min MPa
Yield Strength (0.2% Offset): 220 min MPa
Elongation: 40 min %
Alloy C22:
Tensile Strength: 690 min MPa
Yield Strength (0.2% Offset): 283 min MPa
Elongation: 40 min %
Alloy B3:
Tensile Strength: 690 min MPa
Yield Strength (0.2% Offset): 283 min MPa
Elongation: 40 min %
Alloy G30:
Tensile Strength: 690 min MPa
Yield Strength (0.2% Offset): 283 min MPa
Elongation: 40 min %
Alloy B2:
Tensile Strength: 690 min MPa
Yield Strength (0.2% Offset): 283 min MPa
Elongation: 40 min %
Fabrication and Welding
Hot Forming:
- ASTM B725 steel can be hot formed at temperatures between 1200°F (649°C) and 1650°F (871°C).
- Prior to hot forming, the material should be uniformly heated to avoid cracking or distortion.
Cold Forming:
- ASTM B725 steel can be cold formed using standard methods like bending, flaring, and coining, with proper equipment and lubricants.
- Cold forming operations should be performed at room temperature to minimize cracking or brittleness.
Machining:
- ASTM B725 steel is readily machinable using conventional techniques like turning, milling, drilling, and grinding.
- Carbide-tipped tools are recommended for machining to avoid tool wear and enhance optimal results.
Welding:
- ASTM B725 steel can be welded using standard welding processes such as gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and shielded metal arc welding (SMAW).
- Preheating may not be required for welding, but thicker sections or specific applications may require it.
Post-Weld Heat Treatment (PWHT):
- PWHT is generally not required for ASTM B725 steel, but it may help reduce residual stresses and improve mechanical properties in certain cases.
Welds:
- Welds should be carefully inspected using non-destructive testing (NDT) methods like radiographic testing (RT) or ultrasonic testing (UT) to ensure quality and integrity.
