SPV490 is a high-strength quenched and tempered pressure vessel steel, designed for high-temperature and high-pressure equipment. It features excellent toughness, good weldability, and stable mechanical properties under harsh conditions like thermal cycling and corrosion, suitable for petrochemical, power generation and heavy machinery fields.
Mechnical property for SPV490 steel plate
| Thickness (mm) | |||
| SPV490 steel plate | ≥6 ≤ 50 | > 50 ≤ 100 | > 100 |
| Yield strength (≥Mpa) | 490 | 470 | 450 |
| Tensile strength (Mpa) | 610-740 | ||
Chemical composition for SPV490 steel plate
| Main chemical elements composition of SPV490 steel plate | ||||
| C | Si | Mn | P | S |
| 0.18 | 0.75 | 1.60 | 0.030 | 0.030 |
Processing Flow of SPV490 Steel Plate
Raw Material Preparation and Charging
The process begins with selecting high-quality iron ore, scrap steel, and alloying elements such as manganese, silicon, and small additions of niobium or vanadium. These materials are carefully proportioned according to the chemical composition requirements of SPV490 and then charged into a converter or electric arc furnace.
Smelting and Primary Refining
Inside the furnace, the raw materials are melted at high temperatures. Oxygen is blown into the molten steel to reduce carbon content and remove impurities through oxidation. During this stage, the chemical composition is continuously monitored and adjusted to meet the specified standards for SPV490.
Secondary Refining and Vacuum Treatment
After primary refining, the molten steel is transferred to a ladle furnace for secondary refining. Here, further deoxidation and desulfurization are carried out, and precise amounts of alloying elements are added to achieve the desired strength and toughness. Vacuum degassing (VD or VOD) is then applied to reduce hydrogen, nitrogen, and other harmful gases, significantly improving the steel's purity and internal quality.
Continuous Casting
The refined molten steel is cast into slabs using a continuous casting machine. The slabs are cooled and solidified under controlled conditions to ensure a uniform microstructure and minimize segregation. The cast slabs are then inspected for surface defects before proceeding to the next stage.
Heating and Controlled Rolling
The slabs are reheated to a temperature of around 1150–1200℃ to ensure complete austenitization. They are then subjected to controlled rolling, which involves multiple passes at different temperature ranges. This process refines the grain size, improves the mechanical properties, and imparts the required strength and toughness to SPV490.
Quenching and Tempering
After rolling, the steel plates are rapidly cooled by quenching to form a hard, fine-grained microstructure. They are then tempered at a moderate temperature to relieve internal stresses, improve ductility, and achieve the final balance of high strength and good toughness characteristic of SPV490.
Finishing and Inspection
The tempered plates are straightened, cut to the required dimensions, and subjected to various inspections, including ultrasonic testing, tensile testing, and impact testing. Only plates that meet the strict quality criteria are approved for delivery.
Applications
1. Boiler and Pressure Vessel Manufacturing
SPV490 is widely used in manufacturing boilers and pressure vessels, including industrial boilers, power plant boilers, and pressure vessels for petrochemical and chemical industries. It is mainly applied to key components such as boiler drums, header pipes, and pressure vessel shells that bear high temperature and pressure.
2. Petrochemical and Chemical Equipment
In the petrochemical sector, SPV490 is used to produce reactors, separators, storage tanks, and pipelines for processing crude oil, natural gas, and chemical intermediates.
3. Power Generation Equipment
It is an important material for thermal power plants, nuclear power auxiliary equipment, and renewable energy power generation systems. Specific applications include coal-fired boiler heating surfaces, steam pipelines, and pressure components of gas turbine power generation units.
4. Heavy Machinery and Construction Machinery
SPV490 is used in the manufacturing of pressure-bearing structural parts of heavy machinery, such as hydraulic cylinders, pressure tanks of engineering machinery, and load-bearing components of mining equipment.
advantages
High Strength and Good Toughness
SPV490 combines high tensile strength with excellent toughness, especially at low temperatures, which helps prevent brittle fracture and ensures reliable performance under heavy loads and harsh conditions.
Excellent Weldability
The steel has good weldability, allowing it to be easily joined using common welding processes without significant loss of strength or toughness in the heat-affected zone, which is crucial for large pressure vessels and complex structures.
Good High-Temperature Performance
SPV490 maintains stable mechanical properties at elevated temperatures, showing resistance to creep and thermal fatigue, making it suitable for long-term service in boilers and power plant equipment.
Good Corrosion Resistance
With proper alloying and clean steelmaking, it offers reasonable resistance to general corrosion and certain corrosive media, contributing to longer service life in petrochemical and chemical applications.
Reliable Formability and Processability
The steel can be formed, bent, and machined using standard industrial methods, which simplifies manufacturing and reduces production costs for pressure vessels and heavy machinery components.
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What is the difference between SPV490 and A36 steel?
SPV490 has higher strength (yield strength ≥315MPa vs. A36's ≥250MPa) and better corrosion resistance than A36. A36 is for general structural use, while SPV490 is tailored for marine and pressure vessel applications.
Can SPV490 be cut by plasma cutting?
Yes, plasma cutting is suitable for SPV490. It can cut steel plates of various thicknesses efficiently and accurately. Proper cutting parameters (current, gas flow) should be set to ensure smooth cut edges and no thermal damage.
What is the service life of SPV490 in marine environments?
With proper anti-corrosion treatment and regular maintenance, SPV490 can have a service life of 20-30 years in marine environments. The service life may vary depending on seawater salinity and operating conditions.
Does SPV490 contain any alloying elements?
Yes, SPV490 contains trace alloying elements such as Cu (≤0.30%), Cr (≤0.30%), and Ni (≤0.50%). These elements improve its strength, toughness and corrosion resistance without increasing production costs significantly.
What is the bending performance of SPV490?
SPV490 has excellent bending performance. It can withstand 180° cold bending tests (diameter = 2-3 times plate thickness) without cracks, showing good ductility and adaptability to structural shaping.
Can SPV490 be used in offshore wind turbine structures?
Yes, SPV490 is applicable to offshore wind turbine foundations and supporting structures. Its high strength and corrosion resistance can withstand strong winds, waves and seawater erosion in offshore wind farms.
What is the tensile test standard for SPV490?
The tensile test of SPV490 follows JIS Z 2241. Samples are taken from steel plates, and tests are conducted at room temperature to measure tensile strength, yield strength and elongation rate to verify compliance with standards.
Is SPV490 available in coil form?
Generally, SPV490 is supplied as steel plates. Coil form is rare because its main applications (shipbuilding, pressure vessels) require flat plates. However, some manufacturers can provide coils for specific processing needs.
What is the impact energy requirement for SPV490?
For SPV490, the minimum impact energy (V-notch) at 0℃ is 31J (based on JIS Z 2242). This ensures the steel has sufficient toughness to resist impact loads in marine operations.
How to identify SPV490 steel plates?
SPV490 steel plates are usually marked with grade (SPV490), standard (JIS G 3115), thickness, width and manufacturer's logo. Chemical composition analysis and mechanical property tests can also confirm its identity.