ASTM A671 CC70 LSAW Pipe
ASTM A671 CC70 LSAW Pipe: Carbon Steel for Low-Temperature & Pressure Service
Comprehensive material data for ASTM A671 Grade CC70 electric-fusion-welded (EFW) pipe made from A516 Gr.70 steel plate, including chemical, mechanical, and physical properties.
Electric-fusion-welding (EFW) using ASTM A516 Gr.70 plate, followed by post-weld heat treatment (normalizing or stress relieving)
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ASTM A671 CC70 LSAW Pipe Introduction
ASTM A671 Grade CC70 is an electric-fusion-welded (EFW) longitudinal seam welded (LSAW) carbon steel pipe produced from pressure vessel quality plates conforming to ASTM A516/A516M Grade 70. Designed for atmospheric and lower temperature service, it offers excellent notch toughness and weldability. The base material is a killed fine-grain carbon-manganese steel with moderate strength and good ductility, widely used in the fabrication of pressure vessels, storage tanks, and low-temperature piping systems. The pipe is supplied in the normalized or stress-relieved condition to ensure consistent mechanical properties and microstructure.
ASTM A671 CC70 LSAW Pipe Chemical Composition
Chemical requirements for the base plate (ASTM A516 Grade 70) used in ASTM A671 CC70 pipe. Values are heat analysis limits unless otherwise stated. The steel is fully killed and fine-grain practice is mandatory. Mn content may be adjusted for thickness; C is controlled for weldability and toughness.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.28 | For plates ≤ 12.5 mm; for thicker plates ≤ 0.30 |
| Manganese (Mn) | 0.85 – 1.20 | Range may vary with thickness: 0.79–1.30 for >12.5 mm |
| Silicon (Si) | 0.15 – 0.40 | Killed steel requirement |
| Phosphorus (P) | ≤ 0.035 | |
| Sulfur (S) | ≤ 0.035 | |
| Chromium (Cr) | ≤ 0.25 | Residual element |
| Nickel (Ni) | ≤ 0.25 | Residual element |
| Molybdenum (Mo) | ≤ 0.08 | Residual element |
| Copper (Cu) | ≤ 0.35 | Residual element |
| Vanadium (V) | ≤ 0.02 | Minute residual |
| Niobium (Nb) | ≤ 0.02 | Fine-grain element, if used |
| Aluminum (Al) | ≥ 0.020 (total) | For fine-grain practice |
ASTM A671 CC70 LSAW Pipe Thermal & Electrical Physical Properties
Physical constants for carbon steel (ASTM A516 Gr.70) used in ASTM A671 CC70 pipe. Values are typical for normalized carbon steel and may vary slightly with composition and processing. These data are not specification requirements but engineering references. Thermal conductivity and expansion are essential for design in temperature services.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Modulus of Elasticity (E) | approx. 205 | GPa | At 20°C |
| Shear Modulus (G) | approx. 80 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.29 – 0.30 | Elastic range | |
| Thermal Expansion Coefficient (α) | 11.7 | ×10⁻⁶/K | 20–100°C |
| Thermal Expansion Coefficient (α) | 12.5 | ×10⁻⁶/K | 20–200°C |
| Thermal Expansion Coefficient (α) | 13.5 | ×10⁻⁶/K | 20–400°C |
| Thermal Conductivity (λ) | 52 | W/(m·K) | At 20°C |
| Thermal Conductivity (λ) | 48 | W/(m·K) | At 200°C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | At 400°C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.18 | µΩ·m | At 20°C |
ASTM A671 CC70 LSAW Pipe Mechanical Properties
Tensile and impact properties for ASTM A671 CC70 pipe base metal (A516 Gr.70) in normalized or stress-relieved condition. Requirements conform to ASTM A516/A516M. Transverse and longitudinal specimens may show slight variations. Impact tests are mandatory at the specified design temperature.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | 485 – 620 | MPa | Room temperature, transverse specimen |
| Yield Strength (ReH) | ≥ 260 | MPa | 0.2% offset, room temperature |
| Elongation (A) | ≥ 21 | % | Gauge length 200 mm (8 in) |
| Elongation (A) | ≥ 17 | % | Gauge length 50 mm (2 in) |
| Impact Energy (KV) | ≥ 27 | J | Charpy V-notch, -46°C (typical design temp for CC70) |
| Impact Energy (KV) | ≤ 18 (lateral expansion) | mm | Charpy V-notch, -46°C (alternate criterion) |
| Bend Test | No cracks or defects | Guided bend, 180°, bend diameter 3× thickness |
ASTM A671 CC70 LSAW Pipe Equivalent Material Standards & Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASME SA671 | CC70 | Identical to ASTM A671 CC70; ASME pressure vessel code approved |
| Europe | EN 10028-2 | P295GH | Plate equivalent with comparable strength and toughness; pipe standard EN 10217-2 P295GH |
| Japan | JIS G3103 | SB480 | Approximate plate equivalent; yield ≥275 MPa, tensile 480–620 MPa |
| China | GB/T 713 | Q345R | Equivalent pressure vessel plate; pipe equivalent is GB/T 9711 L415 (slightly different) |
| International | ISO 9328-2 | P295 | Steel plates for pressure purposes; pipe standard ISO 3183 L415 (approximate) |
ASTM A671 CC70 LSAW Pipe Application Introduction
ASTM A671 CC70 LSAW pipe is preferentially used in industries where low-temperature service, reliability, and weldability are critical. Its base material (A516 Gr.70) is a proven pressure vessel steel with excellent notch toughness. Typical applications include:
Product Applications: Low-temperature pressure vessels (ASME Div.1 / Div.2), LPG and ammonia storage spheres, Cryogenic piping manifolds, Heat exchanger shells, Subsea flowlines and risers with appropriate coating, Industrial process piping systems requiring Charpy-tested material
Processed into products: Pipe spools and welded fittings (elbows, tees, reducers), Flanged pipe sections for vessel nozzles, Straight pipe segments for horizontal or vertical pressure vessels, Jacketed pipe sections for cryogenic transfer, Custom fabricated headers and manifolds, Piping assemblies with post-weld heat treatment
Application industries: Oil and gas (offshore/onshore pipelines, transmission), Petrochemical and chemical processing, Power generation (boiler feedwater, cooling water, firewater systems), Cryogenic storage and transportation (LNG, ethylene), Pressure vessel fabrication (shells, drums, storage spheres), Shipbuilding and marine engineering (ballast, cargo systems)
ASTM A671 CC70 LSAW Pipe Similar/Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A672 | C70 | EFW pipe from A516 Gr.70 plate but with different welding and/or heat treatment; quasi-equivalent |
| USA | ASTM A106 | Grade B | Seamless carbon steel pipe for high-temperature service; similar strength, lower notch toughness |
| Europe | EN 10217-3 | P355N | Welded steel tube for pressure purposes; normalized fine-grain steel, higher strength |
| Japan | JIS G3456 | STPT 480 | Carbon steel pipes for high-temperature service; similar tensile range, limited low-temp toughness |
| China | GB/T 8163 | 20 (Q345B) | Seamless pipe; Q345B has comparable strength, may require impact testing for low-temperature use |
Notes:
Additional requirements: Supplementary specifications (S1–S15) of ASTM A671 may apply, such as full-body normalized pipe, ultrasonic examination of weld seam, or additional Charpy testing. The welding material used for LSAW must be compatible with A516 Gr.70 chemistry. For sour service applications, compliance with NACE MR0175 is often specified and may require restricted hardness and sulfide stress cracking tests. Actual mechanical properties can be affected by plate thickness; refer to the ASTM A671 standard for thickness-dependent yield and tensile adjustments.
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