ASTM A537 Class 2 (A537CL2) Pressure Vessel Steel Plate
ASTM A537 Class 2 (A537CL2) Pressure Vessel Steel Plate - Quenched & Tempered, High Strength
Complete data sheet for ASTM A537 Class 2 boiler and pressure vessel steel: chemical composition, mechanical and thermal properties, international equivalents, and typical applications in oil & gas and power industries.
Hot rolling, quenching, tempering, cold forming, welding, machining
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ASTM A537 Class 2 Pressure Vessel Steel Plate Introduction
ASTM A537 Class 2 (A537CL2) is a heat-treated carbon-manganese-silicon steel plate produced by quenching and tempering, intended for fusion-welded pressure vessels and boilers. It offers a minimum yield strength of 415 MPa (60 ksi) and tensile strength of 550–690 MPa (80–100 ksi) for thicknesses up to 65 mm, with excellent notch toughness at low temperatures. The steel provides good weldability and formability under controlled procedures, making it suitable for moderate- and low-temperature service. Typical applications include storage tanks, process columns, and boiler drums in the petrochemical and power generation sectors.
ASTM A537 Class 2 Pressure Vessel Steel Plate Chemical Composition
The following limits are per ASTM A537/A537M for Class 2. Manganese content varies with plate thickness. Grain-refining elements (Nb, V, Ti, etc.) may be added by agreement. All values are maximum unless a range is given.
| Element | Requirement | Remarks |
|---|---|---|
| C | 0.24 max | |
| Mn | 0.70–1.35 (t ≤ 40 mm) | For plates ≤ 1.5 in. (40 mm) |
| Mn | 1.00–1.60 (40 < t ≤ 100 mm) | For plates > 1.5 in. to 4 in. (40–100 mm) |
| P | 0.025 max | |
| S | 0.025 max | |
| Si | 0.15–0.50 | Heat analysis |
| Cu | 0.35 max | |
| Ni | 0.25 max | |
| Cr | 0.25 max | |
| Mo | 0.08 max | |
| Nb | By agreement | 0.02–0.05 typical if added |
| V | By agreement | 0.02–0.10 typical if added |
| Ti | By agreement | Up to 0.03 typical if added |
| Al (total) | By agreement | Typically 0.020 min for fine grain practice |
ASTM A537 Class 2 Pressure Vessel Steel Plate Physical Properties
The data below are typical for quenched and tempered C-Mn-Si steel and are not mandatory per ASTM A537/A537M. They serve as engineering reference at room temperature unless a range is specified.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | At 20°C |
| Elastic Modulus (E) | 205 | GPa | At 20°C |
| Shear Modulus (G) | 80 | GPa | At 20°C, calculated from E and ν |
| Poisson's Ratio (ν) | 0.3 | – | At 20°C |
| Thermal Expansion (α) | 11.7 | 10⁻⁶/K | 20–100°C |
| Thermal Expansion (α) | 12.1 | 10⁻⁶/K | 20–200°C |
| Thermal Expansion (α) | 12.9 | 10⁻⁶/K | 20–300°C |
| Thermal Conductivity (λ) | 51 | W/(m·K) | At 20°C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | At 100°C |
| Thermal Conductivity (λ) | 48 | W/(m·K) | At 200°C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.24 | µΩ·m | At 20°C |
ASTM A537 Class 2 Pressure Vessel Steel Plate Mechanical Properties
Minimum tensile test values as per ASTM A537/A537M. Impact test requirements (temperature and absorbed energy) are subject to purchaser specification; typical usage is Charpy V-notch at -46°C with minimum 27 J (20 ft·lbf) transverse.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 415 | MPa | Plate thickness ≤ 65 mm |
| Yield Strength (ReH) | ≥ 380 | MPa | Plate thickness > 65 mm to 100 mm |
| Tensile Strength (Rm) | 550 – 690 | MPa | Plate thickness ≤ 65 mm |
| Tensile Strength (Rm) | 515 – 655 | MPa | Plate thickness > 65 mm to 100 mm |
| Elongation (A) | ≥ 18 | % | Gauge length 50 mm (2 in.); t ≤ 65 mm |
| Elongation (A) | ≥ 16 | % | Gauge length 50 mm (2 in.); t > 65 mm |
| Bend Test (180°) | D = 1.5 t | – | Bend diameter; t ≤ 40 mm, no cracks |
| Bend Test (180°) | D = 2.0 t | – | 40 < t ≤ 65 mm |
| Bend Test (180°) | D = 2.5 t | – | 65 < t ≤ 100 mm |
| Charpy Impact (KV) | ≥ 27 (typical) | J | At -46°C, transverse, full-size specimen (by agreement) |
ASTM A537 Class 2 Pressure Vessel Steel Plate Identical Material Standards & Substitutable Grades
| Country / Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASME SA537/SA537M | SA537 Class 2 | Identical to ASTM A537 CL2, accepted by ASME BPVC |
| International | ISO 9328-2 (obsolete) | P420M (approx.) | Not a direct equivalent; strength levels differ |
ASTM A537 Class 2 Pressure Vessel Steel Plate Application Introduction
ASTM A537 Class 2 is extensively used in the fabrication of welded pressure vessels and boilers requiring high strength with good low-temperature toughness. It is suitable for moderate- and low-temperature environments typical of the oil & gas, chemical, and power generation sectors. Components are often post-weld heat treated (PWHT) to relieve stresses.
Product Applications: Spherical and cylindrical storage tanks (LPG, ammonia, propylene), Boiler drums and steam separators, Heat exchangers and condensers, Process columns and reactors, High-pressure pipelines and pig launchers/receivers
Processed into products: Shell plates and formed heads, Tube sheets and baffle plates, Nozzle flanges and reinforcement pads, Manway covers and handhole plates, Pressure vessel internals (e.g., trays, supports)
Application industries: Oil and gas processing, Petrochemical and chemical plants, Power generation (boilers and steam drums), Cryogenic storage and transportation, Shipbuilding (LPG/LEG cargo tanks)
ASTM A537 Class 2 Pressure Vessel Steel Plate Similar / Alternative Materials for Consideration
| Country / Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A516/A516M | A516 Gr.70 | Lower strength (YS ≥260 MPa, TS 485–620 MPa); suitable for moderate service |
| USA | ASTM A537/A537M | A537 Class 1 | Normalized; YS ≥345 MPa, TS 485–620 MPa, less strength but simpler heat treatment |
| EU | EN 10028-3 | P460NL1 | Q&T; YS ≥460 MPa, TS 570–720 MPa, slightly higher strength, excellent low-temp toughness |
| Japan | JIS G3115 | SPV450Q | Quenched and tempered; YS ≥450 MPa, TS 570–700 MPa, equivalent strength class for pressure vessels |
| China | GB/T 713 | Q420R (formerly 18MnMoNbR) | Q&T; YS ≥400 MPa, TS 570–720 MPa, similar alloy concept but strength overlap differs by thickness |
Notes:
Welding: Preheating (typically 100–200°C) and low-hydrogen electrodes are recommended. PWHT may be applied depending on thickness and service requirements. Forming: Hot or cold forming is possible, but cold-formed parts may require subsequent stress relief. NACE Compliance: A537 CL2 can be supplied with HIC-tested properties for sour service upon agreement. Ultrasonic Testing: Often specified per ASTM A577 or A578 for critical applications.
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