Does SPV355 require heat treatment after welding?

SPV355 is a kind of pressure vessel steel plate with high strength and good toughness. It is mainly used in the manufacture of pressure vessels and boilers, complying with relevant industrial standards for safe operation under pressure.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.

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.

Processes Adopted for SPV

Controlled Rolling Process:

This is a core process for SPV production. The heated steel billets are rolled step by step with strictly controlled rolling temperature, speed and pressure. It refines the grain structure of the steel, enhances its strength and toughness, and ensures the uniformity of mechanical properties across the entire plate.

Quenching and Tempering Process:

After rolling, quenching and tempering heat treatment are performed. Quenching involves rapid cooling of the steel plate to improve hardness and strength. Tempering follows at an appropriate temperature to reduce brittleness, eliminate internal stress, and achieve the ideal balance of strength and ductility required for pressure vessel applications.

Precision Heating Process:

The steel billets are heated in a professional furnace with precise temperature control. It maintains a stable heating environment and sufficient holding time to make the internal structure of the billets uniform, improve plasticity, and lay a good foundation for subsequent rolling and forming.

Surface Finishing Process:

Includes derusting, cleaning and polishing. It removes oxide scales and impurities on the surface of the steel plate, ensures a smooth and clean surface, prevents corrosion during storage and use, and improves the overall quality and service life of the product.

Dimensional Calibration Process:

Adopts professional straightening and cutting equipment. It corrects the flatness and straightness of the steel plate, cuts it to the required size accurately, and ensures that the product dimensions meet the strict requirements of pressure vessel manufacturing and installation.

Why Choose Us :

You can get the perfect material according to your requirement at the least possible price.

We also offer Reworks, FOB, CFR, CIF, and door to door delivery prices. We suggest you to do deal for shipping which will be quite economical.

The materials we provide are completely verifiable, right from raw material test certificate to the final dimensional statement.(Reports will show on requirement)

We guarantee to give a response within 24hours(usually in the same hour)

You can get stock alternatives, mill deliveries with minimizing manufacturing time.

We are fully dedicated to our customers. If it will not possible to meet your requirements after examining all options, we will not mislead you by making false promises which will create good customer relations.

Contact now

If you want to learn more about GNEE's products, you can send an email to beam@gneesteelgroup.com. We are more than happy to assist you.

What is the application of SPV355 in the chemical industry?

In the chemical industry, SPV355 is used to manufacture reactors, storage tanks, pipelines and other equipment that carry chemical media. It can withstand the corrosion of general chemical media and ensure production safety.

What is the surface quality requirement of SPV355 steel plates?

The surface of SPV355 steel plates should be smooth, free of cracks, scars, folds, delaminations and other defects. Minor surface defects that do not affect the use can be repaired according to relevant standards.

Can SPV355 be used for high-pressure vessels?

SPV355 is mainly used for medium and low-pressure vessels (general pressure ≤10 MPa). For high-pressure vessels with higher pressure requirements, higher-strength pressure vessel steels (such as SPV410, SPV490) should be selected.

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.

Does SPV355 require heat treatment after welding?

SPV355 usually requires stress relief heat treatment after welding to eliminate welding residual stress, reduce the risk of weld cracks, and improve the structural stability and service life of the workpiece.

What is the density of SPV355?

The density of SPV355 is about 7.85 g/cm³, the same as ordinary carbon steel and low-alloy steel. This density value is widely used in weight calculation during pressure vessel design and manufacturing.

What is the elongation requirement of SPV355?

The minimum elongation of SPV355 is 21% (after tensile test). Good elongation ensures the steel plate can undergo plastic deformation without breaking during forming and use.

Can SPV355 be used to make boiler drums?

Yes, SPV355 is an ideal material for boiler drums. Its high strength, good toughness and pressure-bearing capacity meet the strict requirements of boiler drums for working under high temperature and pressure.

What is the service life of SPV355 pressure vessels?

The service life of SPV355 pressure vessels is usually 10-20 years, depending on the operating environment, maintenance level and working pressure. Regular inspection and maintenance can extend its service life.

Is SPV355 a low-alloy steel?

Yes, SPV355 belongs to 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 the cost.