JIS G3103 SB450 Pressure Vessel Steel

JIS G3103 SB450 steel is a carbon-manganese steel plate designated for pressure vessel and boiler applications within the Japanese Industrial Standard (JIS) system. The "SB" prefix denotes suitability for boiler construction, while "450" indicates a minimum tensile strength of 450 MPa. JIS G3103 SB450 pressure vessel steel offers a balanced combination of strength, toughness, and weldability, making it widely used in moderate and low-temperature pressure-containing equipment.

Characteristics of JIS G3103 SB450 Pressure Vessel Steel:
Strength Level: Classified as a medium-strength steel with a specified tensile strength range of 450–570 MPa.
Weldability: Designed with controlled carbon equivalent (C.E.) to ensure good weldability and minimize cracking risk.
Toughness: Delivers reliable impact resistance, typically verified through Charpy V-notch tests at defined temperatures.
Formability: Exhibits adequate elongation (≥21%) for forming and machining operations.
Heat Treatment: Commonly supplied in normalized condition to refine microstructure and enhance mechanical properties.

Conventional Dimensions:

Thickness: 6 mm to 150 mm.
Width: 1500 mm to 4050 mm.
Length: 3000 mm to 18000 mm.

Chemical Composition of JIS G3103 SB450 pressure vessel steel

The chemical composition of SB450 ensures its suitability for pressure vessel manufacturing by maintaining a low carbon content and controlled alloying elements.

Mechanical Properties of JIS G3103 SB450 pressure vessel steel

The mechanical properties of SB450 are tailored to meet the requirements of pressure vessel design, offering a good balance of strength and ductility.

Equivalent Materials to JIS G3103 SB450 pressure vessel steel

SB450 can be compared to other international steel grades with similar properties.