SA204 Grade B is a ASME/ASTM specification for molybdenum-alloy steel plate used in welded boilers and pressure vessels, known for its balanced strength and weldability, offering higher yield (min 275 MPa) and tensile strength (485-620 MPa) than Grade A but slightly less elongation, featuring a controlled carbon content (around 0.20-0.27%) and molybdenum content (0.45-0.60%) for enhanced performance in high-temperature, high-pressure applications like reactors and heat exchangers.
Chemical Composition
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SA204 Grade B Chemical Composition |
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Grade |
The Element Max (%) |
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C |
Si |
Mn |
P |
S |
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SA204 Grade B |
0.20-0.27 |
0.13-0.45 |
0.90-0.98 |
0.035 |
0.035 |
Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
Mechanical Property
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Mechanical Property of A203 Grade b steel plate |
SA204 Grade B |
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Tensile strength, kis [MPa] |
70-90 [485-620] |
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Yield strength, min, kis [MPa] |
40 [275 |
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Elongation in 8 in. [200 mm], min, % |
17 |
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Elongation in 2 in. [50 mm], min, % |
21 |
Performance & Advantages:
Good Weldability: Resists cracking and produces strong, tough welds.
Corrosion Resistance: Molybdenum content provides better resistance to corrosive media.
Toughness: Maintains good impact toughness, even at lower temperatures.
Formability: Exhibits good ductility for cutting, bending, and stamping.
Applications:
Boilers & Pressure Vessels: Manufacturing components for industrial boilers, nuclear reactors, and high-pressure tanks.
Petroleum & Chemical Industry: Used in reactors, separators, heat exchangers, and storage for liquefied petroleum gas (LPG).
Power Generation: Employed in power stations for high-pressure piping, steam drums, and heat dissipation units.
Shipbuilding: Suitable for ship hulls and other marine structures.
Aerospace: Utilized in certain aerospace applications requiring high strength and temperature resistance.
If you have project requirements for SA204 Grade B, we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email:beam@gneesteelgroup.com.
1.What is SA 204 GR B equivalent to?
ASME SA 204 GR. B Mo Alloy Pressure Vessel steel plate Descriptions: ASMEA204 Grade B is used in fabricators serving industry, especially in the oil, gas and chemical supply markets. Equivalent steel grade is France 15 CD 4.05.
2.What is grade B alloy steel?
Grade B steel, or 9260 steel, is a high-silicon alloy with approximately 0.60% carbon, making it a spring steel.
3.What material is SA302 GR B?
SA302GrB steel plate is one kind Molybdenum alloy steels in ASME SA302/SA302M,SA302 Grade B is totally equal to A302 Grade B in ASTM A302/A302 steel specification.