ASTM B730
ASTM B730 Basic Info
ASTM B730 specifies seamless copper-nickel alloy tube compositions, primarily for marine applications where resistance to seawater corrosion is critical. The main composition typically includes copper with additions of nickel and sometimes small amounts of other elements such as iron and manganese. These tubes exhibit excellent corrosion resistance, thermal conductivity, and mechanical properties, making them suitable for use in heat exchangers, condensers, and piping systems in marine environments.
Characteristics of ASTM B730
- Corrosion Resistance: ASTM B730 steel offers excellent resistance to corrosion, making it suitable for use in a variety of harsh environments, including corrosive chemicals, marine conditions, and high-temperature applications.
- High Strength: This steel exhibits high strength and durability, allowing it to withstand mechanical stresses and pressures encountered in industrial settings.
- Wide Temperature Range: ASTM B730 steel maintains its mechanical properties over a wide temperature range, making it suitable for both low- and high-temperature applications, including cryogenic environments.
- Weldability: ASTM B730 steel is easily weldable using standard welding techniques, allowing for efficient fabrication and joining of components in various industries.
ASTM B730 Data Sheet
Steel Grade
Dimensions and Tol.
Chemical Composition
Equivalent Steel Grades
Mechanical Properties
Fabrication and Welding
Steel Grade
UNS N02200: Nickel 200
UNS N02201: Low-carbon Nickel 201
UNS N04400: Nickel-Copper Alloy 400
Dimensions and Tol.
Nominal Pipe Size (NPS):
1/8″ to 8″ (3.18 mm to 203.2 mm)
Schedule (SCH):
5S, 10S, 40S, 80S, 160, XXH
Outside Diameter (OD):
0.405″ to 8.625″ (10.29 mm to 219.08 mm)
Wall Thickness:
0.035″ to 0.500″ (0.89 mm to 12.7 mm)
Length:
Single random length (SRL), double random length (DRL), or specific cut lengths up to 42 feet (12.8 meters
Chemical Composition
UNS N02200 (Nickel 200):
- Carbon (C): 0.15 max
- Manganese (Mn): 0.35 max
- Silicon (Si): 0.35 max
- Sulfur (S): 0.010 max
- Copper (Cu): 0.25 max
- Iron (Fe): 0.40 max
UNS N02201 (Nickel 201):
- Carbon (C): 0.02 max
- Manganese (Mn): 0.35 max
- Silicon (Si): 0.35 max
- Sulfur (S): 0.010 max
- Copper (Cu): 0.25 max
- Iron (Fe): 0.40 max
UNS N04400 (Alloy 400):
- Carbon (C): 0.30 max
- Manganese (Mn): 2.0 max
- Silicon (Si): 0.50 max
- Sulfur (S): 0.025 max
- Copper (Cu): 28.0-34.0
- Iron (Fe): 2.5 max
Equivalent Steel Grades
United States:
Equivalent Grades: ASTM B161, ASTM B622, ASTM B626
Standard: ASTM (American Society for Testing and Materials)
Germany:
Equivalent Grades: DIN 17751, DIN 17753
Standard: DIN (Deutsches Institut für Normung)
United Kingdom:
Equivalent Grades: BS 3074
Standard: BS (British Standards)
Japan:
Equivalent Grades: JIS NW 2200, JIS NW 2201
Standard: JIS (Japanese Industrial Standards)
Mechanical Properties
UNS N02200 (Nickel 200):
- Tensile Strength (MPa): 420 min
- Yield Strength (MPa) (0.2% Offset): 148 min
- Elongation (%): 15 min
UNS N02201 (Nickel 201):
- Tensile Strength (MPa): 380 min
- Yield Strength (MPa) (0.2% Offset): 103 min
- Elongation (%): 20 min
UNS N04400 (Alloy 400):
- Tensile Strength (MPa): 550 min
- Yield Strength (MPa) (0.2% Offset): 170 min
- Elongation (%): 30 min
Fabrication and Welding
Hot Forming:
- ASTM B730 steel can be hot formed at temperatures between 1200°F (649°C) and 1600°F (871°C).
- Prior to hot forming, the material should be uniformly heated to the desired temperature to avoid cracking or distortion.
Cold Forming:
- ASTM B730 steel can be cold formed using standard methods, such as bending, flanging, and coining, with appropriate equipment and lubricants.
- Cold forming operations should be performed at room temperature to minimize the risk of cracking or brittleness.
Machining:
- ASTM B730 steel is readily machinable using conventional machining techniques, such as turning, milling, drilling, and grinding.
- Carbide-tipped tools are recommended for machining ASTM B730 steel to achieve optimal results and tool longevity.
Welding:
- ASTM B730 steel can be welded using various welding processes, including gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and shielded metal arc welding (SMAW).
- Preheating is generally not required for welding ASTM B730 steel, but it may be necessary for thicker sections or specific applications.
- Suitable filler metals for welding ASTM B730 steel include AWS A5.14 ERNiCr-3 (Alloy 82) and AWS A5.14 ERNiCrMo-3 (Alloy 625).
- Post-weld heat treatment (PWHT) is typically not required for ASTM B730 steel, but it may be beneficial to relieve residual stresses and improve mechanical properties in certain cases.
- Welds should be carefully inspected using non-destructive testing (NDT) methods, such as radiographic testing (RT) or ultrasonic testing (UT), to ensure quality and integrity.
Choosing the Right ASTM B730 Material for Your Project: Factors to Consider
- Chemical Composition: Check the composition of the ASTM B730 material to ensure compatibility with the environmental conditions and intended applications.
- Mechanical Properties: Evaluate mechanical properties such as tensile strength, yield strength, and hardness to match the requirements of your project.
- Corrosion Resistance: Assess the material’s resistance to corrosion, especially if it will be exposed to harsh environments or corrosive substances.
- Temperature Resistance: Consider the material’s ability to withstand high or low temperatures, depending on the operating conditions of your project.
- Fabrication Requirements: Review fabrication methods and processes required for the ASTM B730 material to ensure compatibility with your manufacturing processes.
- Availability and Cost: Determine the availability of the material in the required form and size, and consider its cost implications for your project budget.
- Industry Standards: Ensure that the chosen ASTM B730 material meets relevant industry standards and certifications required for your specific application.