ASTM A691 Grade 1-1/4 Chrome (Cr) Alloy Steel EFW Pipes represent a robust and specialized solution for applications demanding high-strength, corrosion-resistant, and heat-resistant properties. These Electric-Fusion-Welded (EFW) pipes are designed to perform reliably in high-temperature and high-pressure environments, making them particularly suitable for industries such as power generation, petrochemicals, and refineries. The alloying of chromium enhances the pipes' resistance to oxidation, while maintaining mechanical integrity at elevated temperatures.
Characterized by their excellent strength and durability, ASTM A691 Grade 1-1/4 Cr Alloy Steel EFW Pipes undergo electric fusion welding, a process that ensures a seamless bond between the longitudinally welded edges of the steel plates. This results in a cohesive and structurally sound pipe with the ability to withstand internal pressure and external stress. The Grade 1-1/4 Cr designation signifies the alloy's composition, containing 1-1/4% chromium content for enhanced corrosion resistance and elevated-temperature performance.
These pipes are available in various sizes and wall thicknesses, catering to diverse project requirements. Furthermore, their suitability for applications involving high temperatures and corrosive environments makes them a reliable choice for critical operations. In essence, ASTM A691 Grade 1-1/4 Cr Alloy Steel EFW Pipes offer a balance between mechanical strength, heat resistance, and corrosion protection, making them a preferred option for industries that demand exceptional performance under demanding 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 a691114 cr alloy steel efw pipes
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Nickel (Ni) | Copper (Cu) |
| Composition (%) | 0.15 max | 0.30-0.60 | 0.025 max | 0.025 max | 0.10-0.50 | 1.00-1.50 | 0.44-0.65 | 0.25 max | 0.35 max |
Mechanical Properties of astm a691114 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 | 45,000 psi (310 MPa) min | 22% min | -50°F (-46°C) avg. energy 20 ft-lbs (27 J) min | 16 max (for plate) |
Advantages of astm a691114 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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