JIS SPV355--Boiler Pressure Vessel Steel Plate

JIS SPV355 JIS G3115 is an industrial standard set by the Japanese Industrial Standard Committee (JISC) that specifies the basic requirements for low- and intermediate-tension carbon steel plates for pressure vessels with a thickness greater than or equal to 3.2mm. Developed to handle pressure containment vessels of various sizes, the standard emphasizes on quality and performance in essential areas such as strength, elongation, weldability, and corrosion resistance. It is applicable to all types of welded structures that are exposed to heat, pressure, and the environment. The various types of plates offered by this standard include those that have a low-tensile strength of up to 270MPa, those with a medium-tensile strength of up to 510MPa, and those with a high-tensile strength of up to 760MPa.

International Equivalents

In global standards, this grade is functionally comparable to:

ASTM (USA): Carbon-manganese-silicon steel for pressure vessels.

EN (Europe): Steel for pressure purposes.

GB (China): High-strength structural steel.

Primary Applications

Key Industrial Applications

Petrochemical & Chemical Sector:

Manufacture of reactors, separators, and heat exchangers.

Fabrication of spherical storage tanks and liquefied gas (LPG) cylinders.

Power Generation:

Production of boiler steam drums, beams, and wall panels.

Critical components for hydropower stations, including high-pressure water pipes and turbine scroll cases.

Pressure vessels for nuclear power plants and thermal power equipment.

Storage & Transport:

Construction of large-scale oil tanks and gas storage cans.

Pipes for transporting hot liquids or high-pressure fluids.

Service Environment

Due to its refined grain structure (often achieved via normalization), SPV355 is chosen for environments requiring high resistance to brittle fracture and long-term thermal stress.

Key Advantages

High Load-Bearing Capacity: Its high yield and tensile strength allow for the construction of thinner, lighter pressure vessels while maintaining the same safety standards as thicker, conventional steels.

Exceptional Toughness: The material exhibits excellent resistance to brittle fracture, ensuring the vessel can absorb energy and resist cracking even under sudden pressure changes or mechanical impact.

Superior Weldability: Low carbon equivalent levels make it highly compatible with various welding techniques. It resists cold cracking in the heat-affected zone, which simplifies the assembly of complex, large-scale structures.

Thermal Stability: It is specifically engineered to retain its mechanical properties at intermediate temperatures, preventing significant deformation or loss of strength during continuous heat exposure in boilers.

Formability: Despite its strength, SPV355 can be cold-formed or hot-rolled into the curved shapes required for spherical tanks and cylindrical shells.

High Purity: Stringent manufacturing standards limit impurities like sulfur and phosphorus, leading to a cleaner internal structure and better overall reliability in critical service.

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What is SPV355?

SPV355 is a kind of pressure vessel steel plate with excellent mechanical properties. It is mainly used to manufacture pressure-bearing equipment, featuring high strength, good toughness and weldability, complying with relevant industrial standards for pressure vessel materials.

What are the main chemical components of SPV355?

The main chemical components of SPV355 include C (carbon), Si (silicon), Mn (manganese), P (phosphorus), S (sulfur), etc. P and S are harmful impurities with strict content limits to ensure the steel's performance and safety in pressure environments.

What is the minimum yield strength of SPV355?

The minimum yield strength of SPV355 is 355 MPa, which is the key index determining its pressure-bearing capacity. This strength level ensures the steel can withstand high internal pressure without deformation or failure in pressure vessel applications.

What temperature range is SPV355 suitable for?

SPV355 is suitable for working temperatures generally between -20℃ and 450℃. It maintains stable mechanical properties within this range, avoiding brittle fracture at low temperatures and performance degradation at high temperatures.

Which standards does SPV355 comply with?

SPV355 mainly complies with the Japanese industrial standard JIS G 3115. This standard specifies the technical requirements, chemical composition, mechanical properties, inspection methods and delivery conditions of pressure vessel steel plates.

What are the common processing methods for SPV355?

Common processing methods for SPV355 include cutting, bending, welding and machining. Welding is crucial for pressure vessel manufacturing, and SPV355's good weldability ensures firm and leak-proof weld joints after proper welding procedures.

Can SPV355 be used in low-temperature environments?

Yes, SPV355 can be used in low-temperature environments up to -20℃. It has good low-temperature toughness, which prevents brittle fracture when subjected to external forces or pressure in cold conditions, ensuring operational safety.

What is the application field of SPV355?

SPV355 is widely used in manufacturing pressure vessels, such as boilers, chemical reactors, storage tanks, gas cylinders and heat exchangers. It is also applied in petroleum, chemical, power generation and other industries with high pressure requirements.

What is the tensile strength range of SPV355?

The tensile strength range of SPV355 is 490-630 MPa. This range reflects the steel's ability to resist tensile deformation and fracture, matching its yield strength to meet the structural strength needs of pressure-bearing equipment.

Does SPV355 require heat treatment after welding?

In most cases, SPV355 requires post-weld heat treatment (PWHT), such as stress relief annealing. This process reduces welding residual stress, improves weld joint toughness and prevents cracking, ensuring the overall performance of the pressure vessel.