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.
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Key Physical Attributes
Density: Similar to other carbon steels, it has a standard density that facilitates weight calculations for large-scale vessel design.
Thermal Conductivity: It provides efficient heat transfer, which is essential for its use in heat exchangers and boilers.
Thermal Expansion: The material is engineered to have a predictable expansion rate at intermediate temperatures, preventing structural warping during thermal cycles.
Magnetic Properties: As a ferritic steel, it is naturally magnetic, allowing for magnetic particle testing (MT) to detect surface or near-surface defects.
Modulus of Elasticity: It maintains high stiffness, ensuring that pressure vessels and storage tanks retain their shape under significant internal stress.
Workability: Its physical state allows for excellent cold and hot forming, enabling the production of curved spherical tank segments.
SPV355 medium temperature pressure vessel steel chemical composition:(%)
Grade | C | Mn | Si | Al | P | S |
SPV355 | ≤0.20 | ≤1.60 | ≤0.55 | 0.75 |
≤0.030 | ≤0.030 |
SPV355 pressure vessel steel mechanical property:
Grade | Tensile strength MPa | Yield strength MPa | elongation |
SPV355 | 520-640 | ≥315 | ≥14 |
Applications
SPV355 is a high-quality pressure vessel steel compliant with JIS G3115, featuring excellent weldability, toughness, and pressure resistance. Its main applications are concentrated in fields requiring strict safety and performance standards, specifically as follows:
Petrochemical Industry: Widely used to manufacture key equipment such as reactors, distillation towers, storage tanks, and heat exchangers. It can withstand high pressure, high temperature, and corrosion from chemical media (e.g., crude oil, natural gas, and chemical reagents), ensuring stable operation of oil refining and chemical production lines.
Energy Power Industry: Applied in the production of boiler drums, steam headers, and pressure pipelines for thermal power plants and nuclear power auxiliary equipment. It adapts to long-term operation under high-temperature (≤450℃) and high-pressure conditions, guaranteeing the safety and efficiency of power generation systems.
Metallurgical & Machinery Industry: Used to fabricate pressure vessels for metallurgical smelting (e.g., blast furnace gas storage tanks) and hydraulic equipment cylinders. It meets the requirements of heavy-load and variable working conditions, with good deformation resistance and fatigue performance.
Urban Infrastructure: Employed in the manufacturing of natural gas storage tanks, LPG transport tanks, and water supply and drainage pressure pipelines. It ensures the safe transportation and storage of energy and water resources in urban operations.
Application Conditions
To give full play to SPV355's performance and ensure operational safety, strict compliance with the following application conditions is required:
Temperature Condition: Suitable for working temperatures ranging from -20℃ to 450℃. When the temperature is lower than -20℃, it is necessary to conduct impact toughness tests to avoid brittle fracture; when exceeding 450℃, its strength will decrease, so it should not be used in long-term high-temperature environments beyond the limit.
Pressure Condition: Designed for medium and high-pressure working environments, with a maximum allowable working pressure (MAWP) matching its thickness and heat treatment state. It must be tested by pressure (hydrostatic or pneumatic test) before use to ensure no leakage under rated pressure.
Medium Condition: Resistant to non-strong corrosive media such as oil, gas, water, and steam. For strong corrosive media (e.g., acids, alkalis), anti-corrosion treatment (coating, lining) or matching with corrosion-resistant materials is required.
Welding & Installation Condition: Welding materials (e.g., E50 series electrodes) matching SPV355 must be used, and preheating (100-150℃) and post-weld heat treatment (PWHT) should be performed to avoid welding cracks. Installation must comply with pressure vessel specifications to ensure tightness and structural stability.
Manufacturing Process
Refining: Molten steel undergoes Vacuum Degassing and Desulfurization to remove impurities (like Sulfur and Phosphorus), ensuring a clean internal structure.
Casting: The steel is formed into slabs via Continuous Casting to maintain chemical uniformity.
Rolling: Slabs are heated and passed through heavy rollers to achieve the required thickness. This often includes Thermo-Mechanical Controlled Processing (TMCP) to refine the grain structure.
Heat Treatment:
Normalizing: Reheating and air-cooling to eliminate internal stress and improve toughness.
Quenching & Tempering (Optional): Rapid cooling followed by reheating to achieve maximum strength and ductility.
Inspection: Plates undergo Ultrasonic Testing (UT) to detect internal flaws and Mechanical Testing to verify yield strength and impact resistance.
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What is the difference between SPV355 and Q345R?
SPV355 (JIS standard) and Q345R (Chinese standard GB 713) are both pressure vessel steels. SPV355 has a higher minimum yield strength (355 MPa vs 345 MPa) and slightly different chemical composition, adapting to different regional standard requirements.
Can SPV355 be used for liquid storage tanks?
Yes, SPV355 is widely used for manufacturing liquid storage tanks (such as water tanks, oil tanks, chemical liquid tanks) that bear certain pressure. Its good sealing performance and pressure-bearing capacity ensure safe storage of liquids.
Does SPV355 need surface treatment before use?
SPV355 needs surface treatment (such as derusting, degreasing) before use, especially before welding or anti-corrosion coating. This removes surface impurities, ensures welding quality and improves the adhesion of anti-corrosion layers.
What is the service life of SPV355 pressure vessels?
The service life of SPV355 pressure vessels is usually 10-20 years, depending on working conditions (temperature, pressure, medium corrosion), maintenance level and compliance with operational specifications. Regular inspection can extend service life.
Can SPV355 be used in hydrogenation reactors?
SPV355 can be used in low-pressure hydrogenation reactors, but for high-pressure and high-temperature hydrogenation conditions, it needs to be specially treated (such as hydrogen embrittlement resistance treatment) or replaced with more suitable steel grades.
What is the impact test requirement for SPV355?
SPV355 requires Charpy V-notch impact test at -20℃, with the minimum impact energy not less than 27 J. This test evaluates the steel's low-temperature toughness and resistance to brittle fracture under impact loads.
What welding materials are suitable for SPV355?
Suitable welding materials for SPV355 include E50 series electrodes (such as E5015, E5016) for manual arc welding, and ER50-6 welding wire for gas metal arc welding (GMAW), ensuring matching mechanical properties with the base metal.
Can SPV355 be cold-formed?
SPV355 can be cold-formed within a certain range, but excessive cold deformation may cause work hardening and reduce toughness. For complex shapes or large deformation, preheating or post-formation heat treatment is recommended.
What are the precautions for transporting SPV355 steel plates?
When transporting SPV355 steel plates, avoid collision and scratch to prevent surface damage. They should be stacked neatly, fixed firmly to prevent slipping, and protected from rain and moisture to avoid rusting before use.
Is SPV355 suitable for offshore oil and gas equipment?
Yes, SPV355 is suitable for some offshore oil and gas equipment (such as onshore storage tanks and pipelines connected to offshore platforms) after anti-corrosion treatment, due to its good pressure-bearing capacity.