ASTM A672 Grade C70 defines the specifications for electric-fusion-welded (EFW) carbon steel pipes, specifically engineered for high-pressure applications at moderate to lower temperatures. These pipes are manufactured using the Longitudinal Submerged Arc Welding (LSAW) process, resulting in a robust and reliable product. With a focus on achieving a balance between mechanical strength and resistance to corrosion, A672 C70 pipes are widely utilized across industries such as oil and gas, petrochemicals, and power generation, where dependable performance under demanding conditions is paramount.
The ASTM A672 C70 carbon steel EFW pipes, produced using the LSAW technique, exhibit notable tensile and yield strengths, making them suitable for conveying liquids and gases under substantial pressure. The longitudinal edges of the steel plates are fused together using submerged arc welding, creating a seamless and robust joint. The Grade C70 designation signifies a minimum yield strength of 70,000 psi, underscoring the pipes' capability to withstand high internal pressures without compromising structural integrity.
Furthermore, the LSAW manufacturing process ensures uniform dimensions and wall thickness throughout the length of the A672 C70 pipes, a critical factor for applications that demand precise tolerances. The selection of these pipes is particularly advantageous for projects requiring durable and cost-effective piping solutions capable of performing reliably under various operational conditions. In summary, ASTM A672 Grade C70 carbon steel EFW pipes, manufactured using the LSAW method, offer a strong and dependable choice for industries seeking robust and high-pressure piping solutions capable of delivering consistent performance in challenging environments.
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Specification:
Sizes (Seamless): Not applicable (EFW pipes, not seamless).
Sizes (ERW) : Not applicable (EFW pipes, not ERW).
Sizes (SAW/EFW) : 16" to 100" nominal diameter (NPS 16 to NPS 100).
Wall Thickness : Up to 2" (50.8 mm).
Length : Available in single random length (SRL) and double random length (DRL), with options for specific cut lengths.
Chemical Properties of astm a672 c70 carbon steel efw pipes lsaw
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | Copper (Cu) | Nitrogen (N) | Aluminum (Al) | Titanium (Ti) |
| Composition (%) | 0.31 max | 0.98 max | 0.025 max | 0.025 max | 0.13-0.45 | 0.25 max | 0.25 max | 0.08 max | 0.02 max | 0.35 max | 0.012 max | 0.02 max | 0.02 max |
Mechanical Properties of astm a672 c70 carbon steel efw pipes lsaw
| Property | Tensile Strength | Yield Strength | Elongation in 2" | Charpy V-Notch Impact Test | Hardness (Brinell) |
| Value | 70,000 psi (485 MPa) min | 40,000 psi (275 MPa) min | 21% min | -50°F (-46°C) avg. energy 20 ft-lbs (27 J) min | 170 max (for plate) |
Advantages of astm a672 c70 carbon steel efw pipes lsaw:
- 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 |
| Pulp and Paper Industry | Pharmaceuticals |
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