ASTM A672 Grade B70 is a specification for electric-fusion-welded (EFW) carbon steel pipes used in high-pressure service at moderate to lower temperatures. These Longitudinal Submerged Arc Welded (LSAW) pipes are designed to withstand various industrial applications, offering a balance of strength, toughness, and corrosion resistance. The A672 B70 pipes are commonly utilized in the oil and gas, petrochemical, and power generation sectors due to their excellent mechanical properties and reliability.
The ASTM A672 B70 carbon steel EFW pipes exhibit remarkable strength characteristics, making them suitable for transporting fluids and gases under substantial pressure. The manufacturing process involves fusing the longitudinal edges of the steel plate using the submerged arc welding technique, resulting in a seamless, durable joint. The B70 grade signifies a minimum yield strength of 70,000 psi, ensuring the pipes' ability to withstand high internal pressures without compromising structural integrity.
Furthermore, the LSAW method used in the production of A672 B70 pipes ensures consistent wall thickness and diameter throughout the pipe length, enhancing their suitability for applications that demand dimensional accuracy. These pipes are often selected for projects that require reliable and cost-effective piping solutions, where high performance under varying operational conditions is essential. Overall, ASTM A672 Grade B70 carbon steel EFW pipes with LSAW construction provide a robust and dependable option for industries seeking durable and high-pressure piping solutions.
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Specification:
Sizes (Seamless): N/A (ASTM A672 specifies electric-fusion-welded pipes, not seamless)
Sizes (ERW) : N/A (ASTM A672 specifies electric-fusion-welded 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 : Single random length (SRL) and double random length (DRL), with options for specific cut lengths.
Chemical Properties of asstm a672 b70 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 (%) | 0.30 max | 1.30 max | 0.025 max | 0.025 max | 0.50 max | 0.25 max | 0.25 max | 0.08 max | 0.02 max | 0.35 max | 0.012 max | 0.06 max | 0.02 max |
Mechanical Properties of asstm a672 b70 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 | 70,000 psi (485 MPa) min | 20% min | -20°F (-29°C) avg. energy 30 ft-lbs (40 J) min | 140 max (for plate) |
Advantages of asstm a672 b70 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 |
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| Heat Exchangers | Gas Processing |
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