ASTM A672 B65 is a specification that outlines the characteristics of electric fusion welded (EFW) carbon steel pipes. These pipes are primarily used for applications involving high-pressure conditions at moderate temperatures. The "B65" designation signifies a particular grade of carbon steel meeting the specification's requirements. EFW pipes are fabricated by employing electric fusion welding techniques, which involve melting the edges of steel plates or strips through an electric current to form a continuous welded seam. Designed to withstand elevated pressures, ASTM A672 B65 pipes find their place in industrial sectors like oil and gas, power generation, and chemical processing. They serve as vital conduits for effectively transporting fluids and gases.
However, it's important to note that these pipes are suited for environments with moderate temperatures, making them unsuitable for extremely high-temperature or cryogenic conditions. The mechanical properties of these pipes, including tensile and yield strength, as well as elongation, are outlined within the ASTM standard. This ensures their ability to endure the pressures and stresses encountered during their intended use. The specification encompasses a range of sizes and dimensions to accommodate diverse application needs.
Manufacturing processes for ASTM A672 B65 pipes involve various welding techniques, such as submerged arc welding (SAW) or electric resistance welding (ERW), to achieve the necessary fusion and structural integrity. Adhering to specific quality control standards, the manufacturing process ensures the pipes meet the stipulated mechanical and chemical properties as per the ASTM guidelines. For precise technical information and detailed requirements, direct reference to the ASTM A672 B65 standard document is advisable, as well as seeking guidance from experts in materials and piping engineering.
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Specification:
| Property | Specification |
| Standard | ASTM A672 |
| Grade | B65 |
| Material | Carbon Steel |
| Welding Method | Electric Fusion Welding (EFW) |
| Application | High-pressure service at moderate temperatures |
| Industries | Oil and Gas, Power Generation, Chemical Processing, etc. |
| Temperature Range | Moderate Temperatures |
| Mechanical Properties | - Tensile Strength<br> - Yield Strength<br> - Elongation |
| Size Range | Varies (as per ASTM standard) |
| Welding Processes | Submerged Arc Welding (SAW), Electric Resistance Welding (ERW) |
| Quality Control | Adherence to ASTM standards for mechanical and chemical properties |
| Suitable Environments | Moderate temperature conditions |
Chemical Composition of ASTM A672 B65 CARBON STEEL EFW PIPE
| Element | Composition Range |
| Carbon (C) | 0.24% max |
| Manganese (Mn) | 0.98% max |
| Phosphorus (P) | 0.025% max |
| Sulfur (S) | 0.025% max |
| Silicon (Si) | 0.15% max |
| Nickel (Ni) | 0.40% max |
| Chromium (Cr) | 0.25% max |
| Molybdenum (Mo) | 0.08% max |
| Copper (Cu) | 0.40% max |
Mechanical Properties of ASTM A672 B65 CARBON STEEL EFW PIPE
| Property | Minimum Value |
| Tensile Strength | 65 ksi (450 MPa) |
| Yield Strength | 37 ksi (250 MPa) |
| Elongation | 28% |
Advantages of ASTM A672 B65 CARBON STEEL EFW PIPE
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
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