SPV450 is a high-strength pressure vessel steel plate specified under the Japanese Industrial Standards, primarily in JIS G 3115. It is designed for use in boilers, pressure vessels, and other equipment that must withstand significant internal pressure and mechanical stress. The steel is produced with a low-carbon chemistry to ensure good weldability and toughness, and it typically includes small amounts of alloying elements that help refine the grain structure and enhance strength. SPV450 is usually supplied in the quenched and tempered condition, which gives it a good combination of high yield and tensile strength along with adequate ductility and impact resistance. Its clean steelmaking process and strict control of impurities contribute to reliable performance in critical applications where safety and structural integrity are essential.
Chemical Composition and Mechanical Properties:
| SPV450 Chemical Composition | |||||
| Grade | The Element Max (%) | ||||
| C | Si | Mn | P | S | |
| SPV450 | 0.18 | 0.75 | 1.60 | 0.030 | 0.030 |
| Grade | SPV450 Mechanical Property | |||
| Thickness | Yield | Tensile | Elongation | |
| SPV450 | mm | Min Mpa | Mpa | Min % |
| 6-50 | 450 | 570-700 | 19% | |
| 50-100 | 430 | 570-700 | 26% | |
| 100-200 | 410 | 570-700 | 20% | |
SPV450: Adopted Processes
SPV450 relies on strict processes to ensure its performance for pressure-bearing applications. Key processes are briefly outlined as follows:
Steelmaking Process:
Adopts BOF or EAF smelting with strict composition control, reducing harmful impurities. Trace alloying elements are added, followed by secondary refining to purify molten steel.
Rolling Process:
Uses controlled rolling technology. The billet is hot-rolled with controlled parameters, then cooled properly to ensure fine grains and stable microstructure.
Heat Treatment Process:
Mainly adopts quenching and tempering to balance strength and toughness. Normalizing can be an alternative with mutual agreement.
Surface Treatment and Inspection:
Undergoes shot blasting, pickling, etc., for surface cleaning. Ultrasonic and other non-destructive tests are conducted to ensure internal and surface quality.
Welding Process:
Uses matching materials and controlled parameters to ensure weld quality, with simplified preheating/post-heat treatment under certain conditions.
applications
Boiler Manufacturing:
Widely used in boiler pressure components (water wall tubes, superheaters, etc.). Suitable for power generation, petrochemical and metallurgical industries, it endures long-term high pressure and temperature, ensuring safe operation and preventing leakage or burst via excellent strength and toughness.
Pressure Vessel Production:
A core application field, used to make storage tanks, reactors and other pressure vessels for petrochemical, pharmaceutical, food and other industries. It meets industry-specific safety and pressure-bearing requirements while ensuring pressure resistance.
Thermal Power and Nuclear Power Auxiliary Equipment:
Applied in thermal power plant auxiliary devices (desulfurization, heat recovery boilers, etc.) and nuclear power non-core pressure-bearing components. Its corrosion resistance and strength extend service life and ensure system safety.
Marine and Offshore Engineering Equipment:
Used in marine boilers, offshore storage tanks and subsea pipeline components. Its good weldability and corrosion resistance adapt to harsh marine environments (humidity, salt spray, temperature differences) and ensure long-term reliability.
Market Availability
Availability: Because SPV450 is a specialized material, it is rarely found in general market stock. It is typically handled via custom mill orders (direct from the manufacturer).
Alternatives: If lead times are tight or small quantities are needed, engineers often consider substituting it with SPV490 (a higher grade that is more commonly stocked).
Pricing Trends: As of 2026, while general heavy plate prices fluctuate around ¥100,000 to ¥120,000 per ton, specialized grades like SPV450 vary significantly based on specific requirements and lot sizes.
Why Choose SPV450
Excellent strength and toughness balanceSPV450 provides high strength along with good ductility and impact resistance, even at relatively low temperatures, making it suitable for pressure vessels and boilers under significant internal pressure and mechanical stress.
Good weldabilityWith a low‑carbon composition and strict control of impurities, SPV450 can be welded using common processes without excessive preheating or complex post‑weld treatment, simplifying fabrication and reducing production costs.
Stable and reliable performanceProduced through clean steelmaking and supplied in the quenched and tempered condition, it has a fine‑grained microstructure and high structural integrity, ensuring long‑term reliability in safety‑critical applications.
Cost‑effective solutionOffering a good combination of performance and affordability, SPV450 helps achieve both safety and economic efficiency in pressure‑bearing equipment manufacturing.
Contact us at beam@gneesteelgroup.com for pricing, technical support, or customized solutions. We are always ready to support your project.
Can SPV450 be used to manufacture pressure vessels?
Yes, SPV450 is specially designed for manufacturing boiler and pressure vessels. It meets the pressure-bearing requirements of medium and low pressure vessels, with excellent fatigue resistance and stability under long-term pressure operation.
What heat treatment processes does SPV450 usually undergo?
SPV450 usually undergoes normalizing and tempering heat treatment. Normalizing refines grain structure, while tempering reduces internal stress, improves toughness and ensures stable mechanical properties of the steel.
What is the density of SPV450 steel?
The density of SPV450 steel is approximately 7.85 g/cm³, the same as most carbon structural steels. This density value is widely used in weight calculation and structural design of components made of SPV450.
Is SPV450 a carbon steel or alloy steel?
SPV450 is a medium-carbon structural steel. It mainly consists of carbon and manganese, with trace alloying elements. It is not classified as alloy steel because the content of alloy elements does not meet the alloy steel standard.
What is the yield strength of SPV450?
The minimum yield strength of SPV450 is 245MPa. This yield strength ensures that the steel can resist plastic deformation under a certain load, providing a reliable safety margin for structural and pressure vessel applications.
Can SPV450 be used in high-temperature environments?
SPV450 can be used in medium-temperature environments (up to 400℃) for a long time. At higher temperatures, its strength and toughness will decrease, so it is not suitable for long-term service in high-temperature environments above 450℃.
What are the inspection standards for SPV450 after production?
After production, SPV450 must pass inspections like chemical composition analysis, mechanical property testing (tensile, impact), ultrasonic flaw detection and surface quality inspection, all complying with JIS G 3115 standards.
How to store SPV450 plates to avoid quality degradation?
SPV450 plates should be stored in a dry, well-ventilated warehouse, away from moisture and corrosive substances. They should be placed on wooden pallets to prevent contact with the ground and covered with waterproof cloth to avoid rusting.
What is the application scope of SPV450 in the construction industry?
In the construction industry, SPV450 is used for manufacturing large-span bridge girders, high-rise building structural supports, and heavy-duty foundation components. Its high strength ensures the overall stability and safety of the structure.
What is the difference between SPV450 and Q235 steel?
SPV450 has much higher tensile and yield strength than Q235. It also has better weldability and toughness, suitable for high-load and pressure-bearing applications, while Q235 is mainly used for general structural parts with low load requirements.