ASTM A691 Grade 5CR is a specification that covers electric-fusion-welded (EFW) pipes made from low-alloy steel with chromium content. These pipes are designed to withstand high-temperature and high-pressure environments, making them suitable for applications in industries such as oil and gas, petrochemical, power generation, and more. The "5CR" designation indicates that the alloy steel contains a significant chromium component, which contributes to its enhanced corrosion resistance and ability to retain mechanical properties even at elevated temperatures.
The ASTM A691 Grade 5CR alloy steel EFW pipes exhibit excellent mechanical properties, including high tensile strength and good impact resistance, owing to their alloying elements. The chromium addition provides resistance to oxidation and corrosion, enhancing the pipes' longevity in aggressive environments where exposure to chemicals, water, and high temperatures is common. This makes Grade 5CR pipes well-suited for applications that require a combination of strength and corrosion resistance, such as in steam pipelines, high-temperature boilers, and heat exchangers.
Manufacturing processes for ASTM A691 Grade 5CR pipes involve electric fusion welding, which provides a strong and reliable bond throughout the length of the pipe. The EFW process ensures consistent material properties and dimensional accuracy, meeting the high standards set by ASTM. These pipes are available in various sizes and thicknesses, catering to different application requirements. Engineers and industries seeking reliable and durable solutions for transporting fluids or gases in challenging environments often turn to ASTM A691 Grade 5CR alloy steel EFW pipes due to their proven performance and robust properties.
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Specification:
Sizes (Seamless): Not applicable (A691 is specifically for Electric-Fusion-Welded pipes)
Sizes (ERW) : Not applicable (A691 is specifically for Electric-Fusion-Welded pipes)
Sizes (SAW/EFW) : 16" NB (Nominal Bore) to 84" NB
Wall Thickness : SCH 5S, 10S, 20S, 30, 40S, STD, 40, XS, 60, 80S, 80, 100, 120, 140, 160, XXS
Length : Single Random Length (SRL) and Double Random Length (DRL) - 16 to 22 feet, Custom lengths are also available on request
Chemical Properties of ASTM A691 5CR Alloy steel efw pipes
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Nickel (Ni) | Copper (Cu) |
| Composition Range (% by weight) | 0.15 - 0.21 | 0.25 - 0.66 | ≤ 0.025 | ≤ 0.025 | 0.10 - 0.35 | 4.00 - 6.00 | 0.44 - 0.65 | ≤ 0.50 | ≤ 0.35 |
Mechanical Properties of ASTM A691 5CR Alloy steel efw pipes
| Property | Tensile Strength | Yield Strength (0.2% offset) | Elongation in 2" | Hardness (Brinell) | Impact Properties |
| Value | ≥ 70,000 psi (483 MPa) min. | ≥ 50,000 psi (345 MPa) min. | ≥ 20% | ≤ 217 | Refer to specific requirements in ASTM A691 specification |
Advantages of ASTM A691 5CR 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 |
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