ASTM A533 Grade A Class 1 Pressure Vessel Steel Plate
ASTM A533 Grade A Class 1 Pressure Vessel Steel Plate - Chemical Composition & Properties
Complete material data sheet for ASTM A533 Grade A Class 1 quenched and tempered Mn-Mo alloy steel plate used in pressure vessels and boilers.
Quenched and tempered, welding, hot/cold forming, cutting
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ASTM A533 Grade A Class 1 Pressure Vessel Steel Plate Introduction
ASTM A533 Grade A Class 1 is a manganese-molybdenum alloy steel plate intended for welded pressure vessels and boilers. It is supplied in the quenched and tempered condition, providing a good combination of strength, toughness, and weldability. The steel exhibits a tensile strength range of 80–100 ksi (550–690 MPa) and a minimum yield strength of 50 ksi (345 MPa), making it suitable for service at moderate temperatures. Its fine-grain practice ensures excellent notch toughness, and it is widely specified for petrochemical reactors, power plant boilers, and heat exchangers.
ASTM A533 Grade A Class 1 Pressure Vessel Steel Plate Chemical Composition
The chemical composition limits for ASTM A533 Grade A Class 1 according to ASTM A533/A533M. This Mn-Mo alloy steel has controlled phosphorus and sulfur for improved toughness. Product analysis tolerances apply as per the standard.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | 0.25 max | |
| Manganese (Mn) | 1.15 – 1.50 | Both heat and product analysis ranges apply; for all thicknesses |
| Phosphorus (P) | 0.025 max | |
| Sulfur (S) | 0.025 max | |
| Silicon (Si) | 0.15 – 0.40 | Heat analysis; product analysis: 0.13–0.45 |
| Molybdenum (Mo) | 0.45 – 0.60 | Heat analysis; product analysis: 0.41–0.64 |
ASTM A533 Grade A Class 1 Pressure Vessel Steel Plate Thermal and Electrical Physical Properties
Approximate physical properties for a low-alloy Mn-Mo steel similar to ASTM A533 Grade A Class 1. These values are typical for quenched and tempered pressure vessel steel and may vary slightly with processing and temperature.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 205 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Room temperature |
| Poisson's Ratio (ν) | 0.29 | — | Room temperature |
| Thermal Expansion Coefficient (α) | 11.5 | 10⁻⁶/K | 20–100°C |
| Thermal Conductivity (λ) | 42 | W/m·K | at 100°C |
| Specific Heat Capacity | 460 | J/kg·K | at 20°C |
| Electrical Resistivity (ρe) | 0.20 | μΩ·m | Room temperature |
ASTM A533 Grade A Class 1 Pressure Vessel Steel Plate Mechanical Properties
Tensile, elongation, and bend test requirements for ASTM A533 Grade A Class 1 plates in the quenched and tempered condition. All tests are performed on transverse specimens unless otherwise agreed. Impact test values are often specified per ASME SA-20 or purchaser requirements.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | 80 – 100 | ksi | Room temperature |
| Tensile Strength (Rm) | 550 – 690 | MPa | Room temperature |
| Yield Strength (ReH) | 50 min | ksi | 0.2% offset |
| Yield Strength (ReH) | 345 min | MPa | 0.2% offset |
| Elongation (A) | 18 min | % | Gauge length 2 in. (50 mm) |
| Bend Test | No cracks | — | Bend dia. = 1.5T for T ≤ ¾ in., 2T for T > ¾ in. to 2 in., 180° bend |
| Charpy V-Notch Impact (KV) | Typically 20 ft·lb avg (27 J) min / 15 ft·lb (20 J) min individual | ft·lb (J) | At temperature specified by purchaser (e.g., -40°F/-40°C) |
ASTM A533 Grade A Class 1 Pressure Vessel Steel Plate Fully Equivalent Material Standards and Substitutable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASME SA-533/SA-533M | SA533 Grade A Class 1 | Identical material under ASME Boiler and Pressure Vessel Code, Section II, Part A |
ASTM A533 Grade A Class 1 Pressure Vessel Steel Plate Application Introduction
ASTM A533 Grade A Class 1 is extensively used in pressure vessel and boiler construction where moderate temperature strength and impact toughness are required. Its good weldability makes it suitable for thick-plate fabrication. Common applications include petrochemical reactors, power generation boilers, and nuclear pressure boundaries.
Product Applications: Pressure vessels, Industrial boilers, Heat exchangers, Storage tanks, Reactors
Processed into products: Shell courses, Dished and formed heads, Tube sheets, Integral flanges, Nozzles and manways, Support skirts and saddles
Application industries: Oil & Gas, Power Generation, Chemical Processing, Nuclear, Petrochemical
ASTM A533 Grade A Class 1 Pressure Vessel Steel Plate Similar or Equivalent Alternative Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A302/A302M | A302 Grade A | Mn-Mo steel with slightly lower Mn (0.95–1.30) and same Mo; lower strength class |
| Europe | EN 10028-2 | 16Mo3 (1.5415) | C-Mo steel with Mo 0.25–0.35; used for similar pressure vessel applications but with lower strength |
| Japan | JIS G3119 | SBV1A | Mn-Mo steel for boilers and pressure vessels; comparable chemical composition range |
Notes:
For service temperatures above approximately 650°F (345°C), consideration should be given to creep properties and potential graphitization. Notch toughness requirements are typically verified by Charpy V-notch testing at the minimum design metal temperature. Welding must follow ASME Section IX and may require post-weld heat treatment depending on thickness.
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