ASTM A671 CB60 LSAW Pipe: Carbon Steel for Low-Temperature Service
ASTM A671 CB60 LSAW Pipe: Carbon Steel for Low-Temperature Service | Chemical & Mechanical Data
In-depth technical profile of ASTM A671 CB60 electric-fusion-welded steel pipe (LSAW), derived from A515 Grade 60 plate. Includes verified chemical composition, mechanical properties, thermal and electrical physical properties, equivalent grades, and application guidance.
Cold forming and welding from A515 Grade 60 plate, followed by stress relief or post-weld heat treatment as specified
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ASTM A671 CB60 LSAW Pipe: Carbon Steel for Low-Temperature Service Introduction
ASTM A671 CB60 is a carbon steel grade for longitudinal seam submerged-arc welded (LSAW) pipe intended for atmospheric and lower-temperature service. The pipe is fabricated from steel plates conforming to ASTM A515 Grade 60, a pressure vessel quality carbon-silicon steel. CB60 offers a minimum yield strength of 220 MPa (32 ksi) and a tensile strength range of 415–550 MPa (60–80 ksi). It is characterized by good notch toughness at moderately low temperatures, reliable weldability, and consistent mechanical properties after post-weld heat treatment. This material is commonly selected for pipelines, pressure vessels, and structural applications where a proven balance of strength, ductility, and cost-effectiveness is required.
ASTM A671 CB60 LSAW Pipe: Carbon Steel for Low-Temperature Service Chemical Composition
The chemical requirements correspond to ASTM A515 Grade 60 plate for thicknesses ≤ 25 mm (1 in). All values are maximum limits except for silicon which is a range. The composition is designed to provide a prescribed tensile strength level while maintaining good weldability and ductility.
| Element | Standard Value (max or range) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.24 | For plate thickness ≤ 25 mm |
| Manganese (Mn) | ≤ 0.90 | For plate thickness ≤ 25 mm |
| Phosphorus (P) | ≤ 0.035 | |
| Sulfur (S) | ≤ 0.035 | |
| Silicon (Si) | 0.15 – 0.40 | For plate thickness ≤ 50 mm |
| Iron (Fe) | Balance |
ASTM A671 CB60 LSAW Pipe: Carbon Steel for Low-Temperature Service Thermal & Electrical Physical Properties
These values represent typical physical properties of carbon steel similar to A515 Grade 60. They are not mandatory requirements but are widely used for engineering calculations. Properties are given at ambient temperature unless otherwise noted.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic modulus (E) | 205 | GPa | 20 °C |
| Shear modulus (G) | ≈ 80 | GPa | 20 °C |
| Poisson's ratio (ν) | 0.3 | - | 20 °C |
| Thermal expansion coefficient (α) | 12.1 | 10⁻⁶/K | 0 – 100 °C |
| Thermal conductivity (λ) | 51.9 | W/(m·K) | 20 °C |
| Specific heat capacity | 486 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρₑ) | 0.143 | μΩ·m | 20 °C |
ASTM A671 CB60 LSAW Pipe: Carbon Steel for Low-Temperature Service Mechanical Properties
Tensile properties are measured on the pipe body in the longitudinal direction. Values comply with ASTM A671 for Grade CB60, based on base metal properties of A515 Gr.60 plate. All tests are performed at room temperature after final heat treatment.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 220 | MPa | Room temperature, longitudinal |
| Yield Strength (ReH) | ≥ 32 | ksi | Room temperature, longitudinal |
| Tensile Strength (Rm) | 415 – 550 | MPa | Room temperature, longitudinal |
| Tensile Strength (Rm) | 60 – 80 | ksi | Room temperature, longitudinal |
| Elongation (A) | ≥ 22 | % | Gauge length 50 mm (2 in) |
| Elongation (A) | ≥ 22 | % | Full-thickness specimen |
| Guided bend test | No cracks > 3 mm | - | 180° bend around a pin, diameter per standard |
ASTM A671 CB60 LSAW Pipe: Carbon Steel for Low-Temperature Service Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A671 | CB60 | The same grade; pipe produced from A515 Gr.60 plate. |
| USA/International | ASME SA671 (BPVC) | CB60 | ASME Boiler & Pressure Vessel Code edition; chemically and mechanically identical. |
ASTM A671 CB60 LSAW Pipe: Carbon Steel for Low-Temperature Service Application Introduction
ASTM A671 CB60 LSAW pipe is widely utilised in industrial sectors where moderate low-temperature toughness and dependable strength are required. Typical uses span oil & gas, chemical processing, power generation, and structural engineering. Its fabricability and proven performance under static and cyclic loading make it a cost-efficient choice for large-diameter piping and vessel construction.
Product Applications: Long-distance transmission pipelines for natural gas and crude oil, Pressure vessel shells and heads for LPG, ammonia, and other liquefied gases, Process piping systems in refineries, Water injection and firewater piping, Large-diameter boiler piping (low- to medium-temperature), Structural columns and wind turbine towers (where relevant codes allow)
Processed into products: Pipe spools and fittings (elbows, tees, reducers), Flanged connections and valve bodies, Manifolds and headers, Pile sleeves and conductor casings, Storage tank annular rings and bottom plates (transition sections), Expansion loops and anchor flanges
Application industries: Oil & gas transportation (onshore/offshore), Petrochemical and chemical plants, Power generation (feedwater, steam pipes), Pressure vessel and storage tank manufacturing, Water and wastewater infrastructure, Structural and piling applications
ASTM A671 CB60 LSAW Pipe: Carbon Steel for Low-Temperature Service Similar but Not Identical Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A671 | CC60 | Fabricated from A516 Grade 60 plate. Similar strength (YS 220 MPa, TS 415-550 MPa) but finer grain practice and better low-temperature notch toughness. Often directly interchangeable for CB60. |
| USA | ASTM A671 | CB65 | Made from A515 Grade 65 plate. Slightly higher tensile strength (450-585 MPa), yield 240 MPa. May be considered when a strength upgrade is needed. |
| Europe | EN 10025-2 | S275J0 / S275JR | Structural carbon steel with comparable yield (275 MPa) but requires careful assessment for pressure equipment due to different toughness and assurance levels. |
| Europe | EN 10028-2 | P265GH / P295GH | Pressure vessel steels with similar tensile range. P265GH has YS 240 MPa; may be a functional alternative with proper design adjustment. |
Notes:
General remarks:
- This data reflects ASTM A671 CB60 requirements from the current edition of ASTM A671/A671M with base plate per ASTM A515/A515M Grade 60 (thickness ≤ 25 mm). For thicker pipe walls (plate thickness > 25 mm), chemical composition limits and tensile test specimen dimensions may vary; consult the applicable material certificates.
- Impact toughness values are not specified by the base grade; if low-temperature notch toughness is required, supplementary requirements (e.g., Charpy V-notch tests) must be agreed upon between purchaser and manufacturer.
- Post-weld heat treatment (PWHT) is typically performed to relieve residual stresses; exact parameters depend on pipe geometry and service conditions.
- Always verify the latest standard revisions and project-specific specifications before material selection.
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