ASTM A672
Basic Info
The ASTM A672 standard specifies the standard specifications for welded steel pipes used in high-pressure services. These steel pipes are commonly used in pipeline systems for high-pressure, high-temperature, and low-temperature services, such as boilers, condensers, etc. The A672 standard covers the chemical composition, mechanical properties, and dimensional requirements of pipes to ensure that products have good weldability and durability, suitable for various engineering projects.
Description
High Pressure Service: ASTM A672 steel pipes are designed for use in high-pressure service applications. They are capable of withstanding elevated pressures, making them suitable for transporting fluids and gases under demanding conditions, such as in power plants and refineries.
Electric-Fusion-Welded: ASTM A672 pipes are manufactured using the electric fusion welding process. This method ensures strong and durable welds, enhancing the structural integrity of the pipes and allowing them to withstand the stresses encountered during operation.
Moderate Temperature Service: ASTM A672 steel pipes are intended for use at moderate temperatures. While not suitable for extreme temperature environments, they are designed to perform reliably within a specified temperature range, providing an efficient and cost-effective solution for various industrial applications.
ASTM A672 Data Sheet
Steel Grade
Dimensions and Tolerances
Equivalent Steel Grades
Chemical Composition
Mechanical Properties
Fabrication and Welding
ASTM A672 Grade B60 vs. Grade B65 vs. Grade B70
Steel Grade
ASTM A672 Grade A45
ASTM A672 Grade B55
ASTM A672 Grade B70
ASTM A672 Grade C65
ASTM A672 Grade A50
ASTM A672 Grade B60
ASTM A672 Grade C55
ASTM A672 Grade C70
ASTM A672 Grade A55
ASTM A672 Grade B65
ASTM A672 Grade C60
ASTM A672 Grade D70
Dimensions and Tolerances
Round
- Dimensions:
Outer Diameter (OD): 6” to 144” (150mm to 3658mm)
Wall Thickness (WT): 0.109” to 4” (2.8mm to 101.6mm)
- Tolerances:
As per ASTM A672 specification
Square
- Dimensions:
Width: 4” to 144” (100mm to 3658mm)
Height: 4” to 144” (100mm to 3658mm)
Wall Thickness (WT): 0.109” to 4” (2.8mm to 101.6mm)
- Tolerances:
As per ASTM A672 specification
Rectangular
- Dimensions:
Width: 6” to 144” (150mm to 3658mm)
Height: 4” to 144” (100mm to 3658mm)
Wall Thickness (WT): 0.109” to 4” (2.8mm to 101.6mm)
- Tolerances:
As per ASTM A672 specification
Equivalent Steel Grades
United States
- Equivalent Grade(s): A516/A516M 70, A691 70
China
- Equivalent Grade(s): Q345R, Q235R
India
- Equivalent Grade(s): SA516/SA516M 70, IS 3589
Japan
- Equivalent Grade(s): SPV490, SG295
Chemical Composition
Carbon (C)
- Composition (%): 0.18 max
Manganese (Mn)
- Composition (%): 0.79-1.30
Phosphorus (P)
- Composition (%): 0.025 max
Element: Sulfur (S)
- Composition (%): 0.025 max
Mechanical Properties
Tensile Strength, min, ksi (MPa)
- Minimum Requirement: 60 (415) to 95 (655)
Yield Strength, min, ksi (MPa)
- Minimum Requirement: 32 (220) to 60 (415)
Elongation in 2 inches (50 mm), min, %
- Minimum Requirement: 21
Elongation in 8 inches (200 mm), min, %
- Minimum Requirement: 21
Fabrication and Welding
Weldability
- Fabrication and Welding Consideration:
ASTM A672 steel pipes exhibit good weldability, allowing for easy fabrication and assembly.
Machinability
- Fabrication and Welding Consideration:
Machining of ASTM A672 steel pipes is feasible but may require proper tooling and techniques.
Formability
- Fabrication and Welding Consideration:
ASTM A672 steel pipes can be formed using standard techniques, such as bending and rolling.
Hot Working
- Fabrication and Welding Consideration:
ASTM A672 steel pipes are typically not subjected to hot working processes due to their manufacturing method.
Cold Working
- Fabrication and Welding Consideration:
Cold working processes such as cold bending and cold forming can be applied to ASTM A672 steel pipes.
Heat Treatment
- Fabrication and Welding Consideration:
ASTM A672 steel pipes are generally not subjected to heat treatment after welding.
Annealing
- Fabrication and Welding Consideration:
Annealing may not be required for ASTM A672 steel pipes, but stress relieving may be beneficial.
Hardening
- Fabrication and Welding Consideration:
ASTM A672 steel pipes are not typically subjected to hardening processes.
Stress Relieving
- Fabrication and Welding Consideration:
Stress relieving may be performed after welding to reduce residual stresses and improve dimensional stability.
Cutting
- Fabrication and Welding Consideration:
ASTM A672 steel pipes can be cut using standard cutting tools such as saws or torches.
Bending
- Fabrication and Welding Consideration:
ASTM A672 steel pipes can be bent using cold bending methods, but caution must be exercised to prevent damage.
Punching
- Fabrication and Welding Consideration:
Punching holes in ASTM A672 steel pipes can be done using standard punching equipment.
Drilling
- Fabrication and Welding Consideration:
Drilling holes in ASTM A672 steel pipes can be done using standard drilling equipment.
Sawing
- Fabrication and Welding Consideration:
ASTM A672 steel pipes can be sawed using band saws or other appropriate cutting equipment.
Welding Processes
- Fabrication and Welding Consideration:
ASTM A672 steel pipes are suitable for various welding processes, including SMAW, SAW, and GTAW.
Preheating
- Fabrication and Welding Consideration:
Preheating may be required for certain grades and wall thicknesses of ASTM A672 steel pipes, as specified in welding procedures.
Interpass Temperature
- Fabrication and Welding Consideration:
Interpass temperature control may be necessary during welding to prevent excessive heat input.
Post-weld Heat Treatment (PWHT)
- Fabrication and Welding Consideration:
Post-weld heat treatment may be required for certain grades and wall thicknesses of ASTM A672 steel pipes, as specified in welding procedures.
Precautions
- Fabrication and Welding Consideration:
Proper fit-up, alignment, and welding techniques should be followed to ensure quality welds and minimize defects.
ASTM A672 Grade B60 vs. Grade B65 vs. Grade B70
ASTM A672 Grade B60
- Chemical Composition:
– Carbon (C): 0.25% max
– Manganese (Mn): 1.35% max
– Phosphorus (P): 0.035% max
– Sulfur (S): 0.035% max
- Mechanical Properties:
– Tensile Strength: 415 MPa (60 ksi) min
– Yield Strength: 240 MPa (35 ksi) min
– Elongation: 23% min in 2 inches
- Applications:
– ASTM A672 Grade B60 is commonly used for moderate-temperature service in welded boilers and pressure vessels, as well as process piping in power plants and refineries.
ASTM A672 Grade B65
- Chemical Composition:
– Carbon (C): 0.24% max
– Manganese (Mn): 1.35% max
– Phosphorus (P): 0.035% max
– Sulfur (S): 0.035% max
- Mechanical Properties:
– Tensile Strength: 450 MPa (65 ksi) min
– Yield Strength: 240 MPa (35 ksi) min
– Elongation: 22% min in 2 inches
- Applications:
– ASTM A672 Grade B65 is suitable for moderate-temperature service in welded boilers and pressure vessels, particularly in environments requiring higher strength.
ASTM A672 Grade B70
- Chemical Composition:
– Carbon (C): 0.30% max
– Manganese (Mn): 1.35% max
– Phosphorus (P): 0.035% max
– Sulfur (S): 0.035% max
- Mechanical Properties:
– Tensile Strength: 485 MPa (70 ksi) min
– Yield Strength: 275 MPa (40 ksi) min
– Elongation: 20% min in 2 inches
- Applications:
– ASTM A672 Grade B70 is used for elevated-temperature service in welded boilers and pressure vessels, where higher strength and resistance to creep and thermal fatigue are required.
