ASTM A533 Grade B Class 1 Pressure Vessel Steel Plate
ASTM A533 Grade B Class 1 Pressure Vessel Steel Plate: Quenched & Tempered Mn-Mo-Ni Alloy
Comprehensive material data for ASTM A533 Grade B Class 1 quenched and tempered Mn-Mo-Ni alloy steel plate used in pressure vessels and boilers. Includes chemical composition, mechanical and physical properties, equivalent grades, and application guidance.
Hot rolling, quenching and tempering, welding, forming, machining, cold bending
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ASTM A533 Grade B Class 1 Pressure Vessel Steel Plate Introduction
ASTM A533 Grade B Class 1 is a quenched and tempered manganese-molybdenum-nickel alloy steel plate specifically designed for elevated-temperature pressure vessel and boiler applications. It offers an excellent combination of high strength, good toughness, and weldability. The alloying elements Mn, Mo, and Ni contribute to deep hardenability and fine carbide precipitation, ensuring uniform mechanical properties through-thickness even in heavy sections. Class 1 designation indicates a minimum yield strength of 55 ksi (380 MPa). Typical applications include nuclear reactor pressure vessels, steam drums, chemical reactors, and heat exchangers. The steel is supplied in the quenched and tempered condition, ready for fabrication with careful welding procedures.
ASTM A533 Grade B Class 1 Pressure Vessel Steel Plate Chemical Composition per ASTM A533/A533M
The chemical composition of ASTM A533 Grade B Class 1 plate steel is controlled to provide high strength and toughness after quenching and tempering. Manganese, molybdenum, and nickel are added for hardenability and resistance to temper embrittlement. Phosphorus and sulfur are kept at low levels to ensure cleanliness and ductility. Residual elements such as copper and chromium are limited but not mandatory for all orders unless specified in supplementary requirements.
| Element | Composition (wt. %) | Notes |
|---|---|---|
| Carbon (C) | 0.25 max | Ladle analysis |
| Manganese (Mn) | 1.10 – 1.55 | Ladle analysis |
| Phosphorus (P) | 0.025 max | Ladle analysis |
| Sulfur (S) | 0.025 max | Ladle analysis |
| Silicon (Si) | 0.13 – 0.45 | Ladle analysis |
| Molybdenum (Mo) | 0.45 – 0.60 | Ladle analysis |
| Nickel (Ni) | 0.40 – 0.70 | Ladle analysis |
| Copper (Cu)* | 0.35 max | When specified |
| Chromium (Cr)* | 0.25 max | When specified |
| Vanadium (V)* | 0.03 max | When specified |
ASTM A533 Grade B Class 1 Pressure Vessel Steel Plate Physical Properties
The physical properties are typical for quenched and tempered low-alloy Mn-Mo-Ni steels. They are not mandatory requirements of ASTM A533 but are useful for design calculations. Properties are given at room temperature except for thermal expansion and conductivity, which are provided for a range of temperatures. Data are representative and may vary slightly depending on exact heat treatment and chemistry.
| Property | Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Elastic Modulus (E) | 205 | GPa | 20°C |
| Shear Modulus (G) | 79.3 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.30 | — | 20°C |
| Thermal Expansion Coefficient (α) | 11.7 × 10⁻⁶ | 1/K | 20 – 100°C |
| Thermal Expansion Coefficient (α) | 12.6 × 10⁻⁶ | 1/K | 20 – 300°C |
| Thermal Conductivity (λ) | 41.0 | W/(m·K) | 20°C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρe) | 2.3 × 10⁻⁷ | Ω·m | 20°C |
ASTM A533 Grade B Class 1 Pressure Vessel Steel Plate Mechanical Properties – ASTM A533 Grade B Class 1
Tensile and impact properties are determined on specimens from the quenched and tempered plate. Values apply to plates in the thickness range up to 50 mm unless otherwise noted. For thicker plates, a slight reduction in elongation may be permitted. The Charpy V-notch impact energy values are typical supplementary requirements (e.g., S5 at -12°C). Bending tests are performed in accordance with ASTM A20/A20M with the bend diameter dependent on the tensile strength level.
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH, 0.2% offset) | ≥ 380 | MPa | At room temperature, transverse specimen |
| Tensile Strength (Rm) | 620 – 795 | MPa | At room temperature, transverse specimen |
| Elongation (A) | ≥ 22 | % | Gauge length 50 mm, plate thickness ≤ 50 mm |
| Elongation (A) | ≥ 18 | % | Gauge length 200 mm, plate thickness ≤ 50 mm |
| Bend Test (180° cold bend) | d = 3a | — | Bend diameter = 3× specimen thickness, no cracks |
| Charpy V-notch Impact Energy (KV) | ≥ 27 (mean of 3) | J | At -12°C, transverse, supplementary S5 typical |
ASTM A533 Grade B Class 1 Pressure Vessel Steel Plate Exact Equivalent Material Standards and Grades
| Country / Region | Standard | Grade / Designation | Notes |
|---|---|---|---|
| USA | ASME SA533/SA533M | Grade B Class 1 (SA533 Gr.B Cl.1) | Identical specification for ASME pressure vessel construction. |
ASTM A533 Grade B Class 1 Pressure Vessel Steel Plate Application Introduction
ASTM A533 Grade B Class 1 is primarily used in welded pressure vessels and boilers operating at elevated temperatures. Its high hardenability allows through-thickness strength in thick sections (up to 300 mm). Common fabrication processes include hot forming, welding (with preheat and post-weld heat treatment), and machining. The steel is often subject to supplementary toughness requirements to resist brittle fracture at low temperatures.
Product Applications: Reactor pressure vessels, Steam drums and water drums, Heat exchangers (shell and channel), Hydrocracker reactors, High-pressure separators, Coke drums
Processed into products: Cylindrical and spherical shells, Ellipsoidal and hemispherical heads, Tube sheets and flanges, Nozzle forgings and reinforcement pads, Bolted manway covers, Structural rings and skirt supports
Application industries: Nuclear power generation, Petrochemical and refining, Fossil fuel power plants, Chemical processing, Pressure vessel and boiler manufacturing
ASTM A533 Grade B Class 1 Pressure Vessel Steel Plate Similar and Alternative Material Recommendations
| Country / Region | Standard | Grade / Designation | Notes |
|---|---|---|---|
| European Union | EN 10028-2 | 13CrNiMo5-4 (1.7335) | Contains Cr (0.90-1.20%) in addition to Ni and Mo; similar strength and toughness for pressure vessels. |
| China | GB/T 3531 | 18MnMoNbR / 12MnNiVR | Nb-bearing steel with similar base composition and application; verify precise chemistry and mechanical equivalency. |
| Japan | JIS G3119 | SBV2 | Boiler and pressure vessel steel with Mn-Mo-Ni, but requirements differ; not a direct substitute without engineering review. |
Notes:
Delivery condition: plates are quenched and tempered. Welding: low-hydrogen processes mandatory; PWHT typically required. Supplementary requirements: Charpy V-notch at -12°C or -40°C (S5/S8), ultrasonic examination (S10), simulated post-weld heat treatment (S2), and through-thickness tensile testing (S12) are often specified. Thickness tolerance: per ASTM A20/A20M. Certification: mill test reports with chemical analysis and mechanical tests are supplied.
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