SPV355 refers to a Japanese Industrial Standard (JIS) for steel plates for pressure vessels for intermediate temperature service. It is widely utilized in the petroleum, chemical, and power industries for manufacturing reactors, heat exchangers, and spherical tanks.
SPV is a grade of pressure vessel steel specified in Japanese industrial standards. It is primarily used for manufacturing boilers, storage tanks, reactors and other equipment that must operate under high pressure and temperature. The steel is designed to provide a good combination of strength, toughness and weldability, allowing it to maintain reliable performance in demanding environments. Its microstructure is carefully controlled through processes such as controlled rolling and heat treatment, which help to refine the grain size and improve overall mechanical properties. This makes the material suitable for critical applications where safety and structural integrity are essential. SPV is widely recognized in the pressure vessel industry for its stable quality and consistent performance under long-term service conditions.
SPV355 pressure vessel steel chemical composition %
| Grade | C max | Si max | Mn max | P max | S max |
| SPV355 | 0.20 | 0.55 | 1.60 | 0.030 | 0.030 |
SPV355 pressure vessel steel Mechanical properties
| Plate Thickness(mm) | Yield strength ReH MPa min | Tensile strength Rm MPa | Elongation A% min | Impact Energy KV2 J min at a temperature in °C of | ||
| -20 | -10 | 0 | ||||
| 6≤t≤50 | 355 | 520-640 | 18 | 47(TMCP) | - | 47 |
| 50<t≤100 | 335 | |||||
| 100<t≤150 | 315 | |||||
SPV355 steel plate Maximum carbon equivalent value (CEV) based on case analysis:
| Grade | Delivery condition | CEV max for nominal thickness t in mm | ||
| 6≤t≤50 | 50<t≤100 | 100<t≤150 | ||
| SPV355 | TMCP | 0.40 | 0.42 | 0.44 |
SPV355 steel plate Welding crack sensitivity composition max %
| Grade | Delivery condition | WCS max for nominal thickness t in mm | |||
| t≤50 | 50<t≤70 | 70<t≤100 | 100<t≤150 | ||
| SPV355 | TMCP | 0.26 | 0.27 | 0.27 | 0.29 |
SPV Processing Flow
Raw Material Preparation: Select qualified steel billets that meet standard requirements, conduct inspection to ensure no defects like cracks or inclusions, and cut them into appropriate sizes according to production needs.
Heating: Put the steel billets into a heating furnace, heat them to a specific temperature (controlled precisely) and keep warm for a certain time to make the internal structure uniform and improve plasticity.
Rolling: Perform controlled rolling on the heated billets using rolling mills. Adjust rolling speed and pressure step by step to form steel plates of required thickness and size, refining the grain structure.
Heat Treatment: Conduct quenching and tempering processes. Quench to improve hardness and strength, then temper to reduce brittleness and ensure stable mechanical properties.
Finishing: Carry out surface treatment (derusting, cleaning), straightening, and cutting to length. Conduct final inspection on dimensions, performance and surface quality to meet delivery standards.
Applications
Boiler Manufacturing: Widely used in the production of industrial boilers, including water-tube boilers, fire-tube boilers and waste heat boilers. It is mainly applied to key components such as boiler drums, header pipes and heat exchange tubes, which need to bear high temperature and pressure for a long time to ensure the stable operation of the boiler system.
Pressure Vessel Production: An important material for manufacturing pressure vessels in petroleum, chemical, natural gas and other industries. It is suitable for vessels that store, transport or react with mediums such as high-pressure gas, liquid chemicals and steam, such as storage tanks, reactors and separators.
Petrochemical Equipment: Used in the manufacturing of core equipment in petrochemical processing plants, including hydrogenation reactors, catalytic cracking equipment and pipeline systems. These equipments often work in harsh environments such as high temperature, high pressure and corrosive mediums, and SPV can meet their performance requirements.
Thermal Power Generation Equipment: Applied to key parts of thermal power plants, such as steam turbines, condensers and pipeline manifolds. It can withstand the impact of high-temperature and high-pressure steam, ensuring the safe and efficient operation of power generation equipment.
Marine Engineering Equipment: Used in the production of marine boilers, pressure vessels and offshore platform supporting equipment. It has good adaptability to marine salt spray corrosion and complex temperature changes, meeting the special requirements of marine engineering.
Application Conditions
Temperature Conditions: Suitable for working environments with medium and high temperatures, generally able to maintain stable mechanical properties in the range of -20℃ to 500℃. It can resist thermal deformation and creep under long-term high-temperature conditions, and will not experience brittle fracture under low-temperature environments within the specified range.
Pressure Conditions: Designed for high-pressure working scenarios, it can bear a certain range of internal pressure (specific pressure value depends on product specifications and processing technology). It is suitable for equipment with working pressure higher than atmospheric pressure, and can ensure structural integrity without leakage under rated pressure.
Medium Compatibility Conditions: Compatible with most non-strong corrosive mediums, such as water, steam, natural gas, light oil and general chemical reagents. For strong corrosive mediums (such as strong acid, strong alkali), it needs to be used with anti-corrosion treatment (such as coating, lining) to avoid material corrosion and failure.
Processing and Welding Conditions: It needs to be processed and formed by professional equipment, and the processing temperature and speed should be strictly controlled to avoid material performance degradation caused by overheating or improper operation. When welding, appropriate welding materials and processes should be selected, and post-welding heat treatment should be carried out if necessary to ensure the strength and toughness of the weld joint.
Environmental Conditions: It can be used in general industrial environments, marine environments and offshore platforms. In harsh environments such as high humidity, salt spray and dust, regular maintenance (such as rust removal, anti-corrosion coating) is required to extend the service life. It is not suitable for long-term use in environments with strong radiation or extreme temperature fluctuations beyond the specified range.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
Which standard does SPV355 comply with?
SPV355 complies with the Japanese industrial standard JIS G 3115. This standard specifies the technical requirements, dimensions, inspection methods and quality standards of pressure vessel steel plates.
What is the tensile strength range of SPV355?
The tensile strength range of SPV355 is 490-630 MPa. This range ensures that the steel plate has sufficient toughness and ductility to avoid brittle fracture during use.
Can SPV355 be welded?
Yes, SPV355 has good weldability. Proper welding processes and materials should be adopted during welding to ensure the weld quality and avoid defects such as cracks that affect the pressure-bearing performance.
Is SPV355 resistant to corrosion?
SPV355 has certain atmospheric corrosion resistance, but in harsh corrosive environments (such as acid-base media), it needs anti-corrosion treatment (such as coating, galvanizing) to extend its service life.
What is the difference between SPV355 and Q355 steel?
SPV355 is specialized for pressure vessels, with stricter toughness and purity requirements; Q355 is general structural steel, mainly used for buildings and bridges, with different application scenarios and standard specifications.
What processing methods are suitable for SPV355?
SPV355 is suitable for cutting, bending, stamping, welding and other processing methods. During processing, the temperature and speed should be controlled to avoid affecting its mechanical properties.
What is the maximum operating temperature of SPV355?
The maximum safe operating temperature of SPV355 is generally around 450℃. Exceeding this temperature will lead to a significant decrease in its strength and toughness, endangering the safety of pressure vessels.
How to inspect the quality of SPV355 steel plates?
Quality inspection of SPV355 includes chemical composition analysis, mechanical property testing (tensile, yield, impact), ultrasonic flaw detection, appearance inspection, etc., to ensure compliance with standard requirements.
Can SPV355 be used at low temperatures?
SPV355 can be used at moderate low temperatures, but its impact toughness decreases at extremely low temperatures. For low-temperature pressure vessels, low-temperature resistant grades of SPV355 or special treatment are required.
What is the hardness of SPV355?
The Brinell hardness of SPV355 is usually between 137-179 HB. Proper hardness ensures the steel plate has a good balance of strength and toughness, facilitating processing and forming.
What is the thickness range of SPV355 steel plates usually?
The thickness range of SPV355 steel plates is usually 6mm to 200mm. Different thicknesses are selected according to the specific pressure and structural requirements of the pressure vessel.
What is the impact toughness requirement of SPV355?
SPV355 has strict impact toughness requirements, generally requiring a Charpy V-notch impact energy of not less than 27J at room temperature, ensuring it can resist impact loads in service.