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.
Chemical element
| Element | Min | Max | Similar |
|---|---|---|---|
| Si | 0.1500 | 0.5500 | - |
| S | - | 0.0300 | - |
| P | - | 0.0300 | - |
| Mn | - | 1.6000 | - |
| C | - | 0.2000 | - |
Mechanical properties
| Yield Rp0.2 (MPa) |
Tensile Rm (MPa) |
Impact KV/Ku (J) |
Elongation A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 985 (≥) | 858 (≥) | 24 | 31 | 22 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 212 |
Physical properties
| Temperature (°C) |
Modulus of elasticity (GPa) |
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) |
Specific thermal capacity (J/kg·°C) |
Specific electrical resistivity (Ω mm²/m) |
Density (kg/dm³) |
Poisson's coefficient, ν |
|---|---|---|---|---|---|---|---|
| 11 | - | - | 0.23 | - | |||
| 165 | 711 | - | 14.3 | 211 | - | ||
| 933 | - | 33 | 12.2 | 214 | 324 |
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.
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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 is the density of SPV355?
The density of SPV355 is approximately 7.85 g/cm³, the same as ordinary carbon structural steel. This density value is used for weight calculation in pressure vessel design and manufacturing.
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.
Is SPV355 a low-alloy steel?
Yes, SPV355 is a low-alloy high-strength steel. It adds a small amount of alloying elements (such as Mn, Si) on the basis of carbon steel, which improves its strength and toughness without significantly increasing production costs.
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.
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.