Product Description
B60, B70 EFW ASTM A672 Carbon Steel Welded Pipe
1. Product Specifications
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Specification Items
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B60
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B70
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Standard
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ASTM A672
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ASTM A672
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Material Grade
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B60
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B70
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Manufacturing Process
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Electric - Fusion - Welded (EFW)
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Electric - Fusion - Welded (EFW)
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Outer Diameter Range
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Typically from 1/2 inch to 48 inches, depending on production capabilities and market demands
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Similar range as B60, but with potential for more availability in larger diameters for high - volume applications
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Wall Thickness Range
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Generally from 0.065 inches to 1.00 inches, designed to meet various pressure and application requirements
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Similar to B60, but may have a wider range of thicker - wall options to handle higher pressures, usually from 0.065 inches to 1.25 inches
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Yield Strength
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Minimum of 414 MPa (60 ksi)
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Minimum of 483 MPa (70 ksi)
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Tensile Strength
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517 - 655 MPa (75 - 95 ksi)
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586 - 724 MPa (85 - 105 ksi)
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Recommended Temperature Range for Service
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Suitable for applications with temperatures ranging from - 29°C to 427°C
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Also suitable for - 29°C to 427°C service temperatures
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2. Explanation of Material and Standard
Material Grade
- B60: This grade of carbon steel is engineered to provide a balance between strength and formability. The "B" likely represents a specific classification within the ASTM A672 standard related to its chemical composition and mechanical properties. With a minimum yield strength of 414 MPa, it can withstand moderate levels of stress. The chemical composition is carefully formulated to ensure good weldability during the EFW process. This allows for the creation of reliable and durable welds, which is crucial for the integrity of the pipe in service. It typically contains a certain percentage of carbon, along with other alloying elements in controlled amounts to enhance its properties.
- B70: As the numerical value indicates, B70 offers higher strength compared to B60. With a minimum yield strength of 483 MPa, it is designed for applications where greater load - bearing capacity is required. The increase in strength is achieved through adjustments to the chemical composition. This may involve a slightly higher carbon content or the addition of specific alloying elements in optimized proportions. These changes not only boost the strength but also need to maintain other important properties such as toughness and weldability.
Standard (ASTM A672)
ASTM A672 is a standard for electric - fusion - welded steel pipe for moderate and high - pressure service at ambient and elevated temperatures. It sets strict requirements for every aspect of the pipe manufacturing process. This includes the raw materials used, the EFW process parameters, the chemical composition limits, and the mechanical property specifications. Pipes that comply with this standard are rigorously tested to ensure they can safely and reliably operate under the specified pressure and temperature conditions. In industries such as power generation, petrochemicals, and oil and gas, where the transportation of fluids under pressure and at various temperatures is common, ASTM A672 - compliant pipes are highly preferred. The standard also plays a crucial role in ensuring quality control and compatibility in different industrial systems.
3. Application Areas
B60
- General Industrial Piping: B60 pipes find extensive use in general industrial settings. For example, in manufacturing plants for the transportation of non - corrosive or mildly corrosive fluids such as process water, compressed air, or certain chemical solutions at moderate pressures. Their moderate strength and good weldability make them cost - effective for these applications.
- Low - to - Medium Pressure Steam Lines: In some industrial processes or small - to - medium - sized power generation facilities that operate at relatively low to medium steam pressures, B60 pipes can be used to transport steam. They can withstand the thermal and mechanical stresses associated with steam flow within this pressure range.
B70
- High - Pressure Fluid Transport in Oil and Gas: In the oil and gas industry, B70 pipes are commonly used for high - pressure pipelines. This includes the transportation of natural gas over long distances in transmission pipelines or the transfer of high - pressure crude oil within refineries. Their high strength allows them to resist the significant internal pressure exerted by the fluids.
- Power Generation - High - Pressure Systems: In power plants, B70 pipes are suitable for high - pressure boiler feedwater lines. These lines need to withstand the high - pressure water being pumped into the boilers. Additionally, they can be used in other high - pressure systems within the power plant, such as in some high - pressure steam turbine piping where the pipes must endure high - pressure and high - temperature steam.
4. Market and Competition
In the global market, B60 and B70 EFW ASTM A672 carbon steel welded pipes face competition from various sources. Seamless pipes, for instance, are often preferred in some applications due to their perception of having higher integrity as they lack welds. However, the EFW process used for B60 and B70 pipes offers several advantages. It allows for more cost - effective production, especially for larger - diameter pipes. The compliance with the well - recognized ASTM A672 standard gives these pipes an edge in industries where strict quality and performance standards are required. The availability of two different strength grades (B60 and B70) also enables manufacturers to cater to a wide range of customer needs. This flexibility in product offerings enhances their competitiveness in the market, making them suitable for both cost - sensitive and high - performance - demanding applications.
Detailed Photos
Processing of Production
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