ASTM A691 Grade 2-1/4 Cr Alloy Steel EFW Pipes represent a specialized and reliable solution tailored for applications requiring superior strength, elevated-temperature stability, and corrosion resistance. These Electric-Fusion-Welded (EFW) pipes are designed to withstand high-pressure and high-temperature environments, making them well-suited for industries such as power generation, petrochemicals, and refineries. The alloy composition, enriched with 2-1/4% chromium, imparts exceptional resistance to oxidation and high-temperature creep.
Distinguished by their robustness and durability, ASTM A691 Grade 2-1/4 Cr Alloy Steel EFW Pipes are fabricated using electric fusion welding, a process that ensures a seamless and continuous bond between the longitudinally welded edges of the steel plates. This creates a structurally sound pipe capable of withstanding internal pressure and external stresses. The Grade 2-1/4 Cr designation highlights the alloy's composition, featuring 2-1/4% chromium content for heightened corrosion resistance and reliable performance at elevated temperatures.
Available in various sizes and wall thicknesses, these pipes cater to diverse project requirements. Their resilience against high temperatures and corrosive environments renders them a dependable choice for critical operations where stability and performance are paramount. In essence, ASTM A691 Grade 2-1/4 Cr Alloy Steel EFW Pipes offer a harmonious blend of mechanical strength, heat resistance, and corrosion protection, making them an optimal solution for industries demanding exceptional performance under challenging conditions.
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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 a691214 cr alloy steel efw pipes
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Nickel (Ni) | Copper (Cu) | Vanadium (V) |
| Composition (%) | 0.22 max | 0.90 max | 0.025 max | 0.025 max | 0.15-0.50 | 2.00-2.50 | 0.90-1.10 | 0.25 max | 0.35 max | 0.05-0.15 |
Mechanical Properties of astm a691214 cr alloy steel efw pipes
| Property | Tensile Strength | Yield Strength | Elongation in 2" | Charpy V-Notch Impact Test | Hardness (Rockwell B) |
| Value | 85,000 psi (585 MPa) min | 60,000 psi (415 MPa) min | 20% min | -50°F (-46°C) avg. energy 20 ft-lbs (27 J) min | 18 max (for plate) |
Advantages of astm a691214 cr alloy steel efw pipes:
- 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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