Products FAQ

S550Q offers higher strength, superior low-temperature toughness, fatigue resistance, and weldability. It is capable of withstanding harsh operating conditions, reduces the structural weight, and provides greater overall engineering benefits.

Both comply with the EN 10025-6 standard and have essentially the same strength parameters. The main difference lies in their low-temperature impact properties:

S550QL: Meets the requirements of most standard heavy-duty engineering applications and offers better value for money.

S550QL1: Has a higher low-temperature toughness rating and is suitable for extremely cold operating conditions;

The key differences between the two lie in their low-temperature impact properties and applicable standards:

P275NL1: Suitable for low-temperature operating conditions at -40°C;

P275NL2: Has stricter low-temperature toughness requirements; it must pass a -50°C impact test, offers a higher safety margin, and provides more stable low-temperature performance. It is suitable for harsh low-temperature environments and high-standard pressure equipment projects.

In addition, the production and inspection standards for P275NL2 are more stringent than those for the NL1 grade.

EN 10028-3 P275NL2 steel plates are primarily used in the manufacture of industrial boilers, medium- and low-pressure pressure vessels, heat exchangers, chemical storage tanks, and cryogenic pressure equipment. They are suitable for low-temperature operating conditions down to -50°C as well as conventional medium- and low-pressure industrial environments, and serve as a core specialty steel grade in European standard pressure equipment manufacturing projects.

Stainless steel sheet is a flat-rolled alloy sheet with a chromium content of at least 10.5%. A dense, chromium-rich oxide film (passivation layer) forms spontaneously on its surface, imparting excellent rust resistance, corrosion resistance, and oxidation resistance to the material. It is widely used in structural manufacturing, equipment fabrication, and construction projects.

304 austenitic stainless steel sheet is typically non-magnetic. However, after cold working (such as bending, stamping, or cutting), it may become slightly magnetic; this does not affect the material’s quality or corrosion resistance.

Stainless steel is not completely rust-proof, but it offers good corrosion resistance under normal conditions. However, pitting or localized corrosion may still occur when exposed to salt spray, strong acids, high-chloride environments, or when left in contact with uncleaned, contaminated surfaces for extended periods.

Stainless steel plates are widely used in shipbuilding, chemical storage tanks, food processing machinery, pharmaceutical equipment, offshore platforms, building curtain walls, pressure vessels, wastewater treatment facilities, and industrial furnace components, among other fields.

Yes. Most austenitic stainless steel sheets have good weldability and formability. It is recommended to control heat input appropriately during processing and to clean and passivate the material promptly after welding to restore its corrosion resistance.

We offer customized processing for bulb flat bars, including cutting to non-standard lengths, custom sizing, surface rust removal, anti-corrosion coating, and other value-added services. We can manufacture products according to customer drawings and project specifications to meet the diverse needs of various construction projects.