Pressure Vessel Steel Plates A302 GR. B
Products Description
ASTM A302 Grade B Pressure vessel steel plate specification covers molybdenum alloy, intended particularly of welded boilers and others pressure vessels steel plate in A302 Gr A,A302 Gr B ,A 302 Gr C andA 302 GrD. A302 Grade B steel plate shall be normally supplied in the as-rolled condition. Plates may be ordered normalized or stress relieved, or both.
ASTM A302M Grade B steel sheet is widely used in petroleum, chemical industry, power station, boiler, etc, used to make the reactor, heat exchanger, separator, spherical tank, liquefied gas, nuclear reactor pressure vessel, boiler steam drum steam, liquefied petroleum, hydropower station, high pressure pipe.
Products Parameters
ASTM A302 Gr. B Chemical Composition
| ASTM A302 Chemical Composition | |||||||
|---|---|---|---|---|---|---|---|
| Steel Grade | The Element Max (%) | ||||||
| C | Si | Mn | P | S | Mo | Ni | |
| A302 Grade B | 0.20-0.25 | 0.13-0.45 | 1.07-1.62 | 0.035 | 0.035 | 0.41-0.64 | |
ASTM A302 Gr. B Mechanical Property
| Steel Grade | ASTM A302 Mechanical Property | |||
|---|---|---|---|---|
| Thickness | Yield | Tensile | Elongation | |
| mm | Min Mpa | Mpa | Min % | |
| A302 Grade B | 6-50 | 345 Mpa | 550-690 Mpa | 18% |
| 50-200 | 345 Mpa | 550-690 Mpa | 15% | |
ASTM A302 Gr. B Equivalent steel grade
| Steel Grade | Europe | Germany | France | Italy | U.K. |
|---|---|---|---|---|---|
| ASTM A302 Gr. B | 14Cr Mo 45 | 13 Cr Mo 44 | 15 CD 4.05 | 14 Cr Mo 46 | 620 Gr.27,31 |
What are the characteristic advantages of A302 Grade B?
High Strength and Toughness
Provides elevated tensile strength (typically 485–620 MPa / 70–90 ksi) and yield strength (≥275 MPa / 40 ksi), making it suitable for moderate-to-high pressure systems.
Molybdenum (Mo) in its composition enhances resistance to creep and fatigue at elevated temperatures, ensuring structural integrity in medium-high temperature environments (e.g., up to 480°C / 900°F).
Excellent Impact Resistance
Exhibits good notch toughness and impact resistance at ambient and slightly sub-zero temperatures (e.g., ≥27 J Charpy V-notch at room temperature), reducing the risk of brittle fracture in dynamic or fluctuating load conditions.
Weldability and Formability
Generally compatible with common welding processes (e.g., SMAW, GTAW) when proper preheating and post-weld heat treatment (PWHT) are applied, facilitating the fabrication of complex vessel structures.
Maintains ductility during forming operations, allowing for bending or rolling into cylindrical or spherical shapes without significant loss of mechanical properties.
Corrosion and Hydrogen Resistance
Molybdenum improves resistance to hydrogen-induced cracking (HIC) and sulfide stress corrosion (SSC) in environments involving hydrogen or sulfur-containing media (e.g., petrochemical refining).
Offers better oxidation resistance than carbon steel at elevated temperatures, extending service life in high-temperature corrosive applications.
Cost-Effective High-Temperature Performance
Balances alloy content (manganese + molybdenum) to provide reliable high-temperature strength at a lower cost than nickel-based or higher-alloy steels (e.g., A203 or A204), making it suitable for industrial applications like boilers, heat exchangers, and pressure vessels in power generation and oil/gas sectors.
If you are interested in buying ASTM A302 steel plate products, contact us now for the latest price or you can send an email to alloy@gneesteelgroup.com.
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