SB410

1. Brief Introduction
SB410 is a carbon steel plate for low-pressure boilers and pressure vessels, specified by the Japanese Industrial Standards (JIS). It offers good plasticity, toughness, and weldability, with mature production processes and high cost-effectiveness. It is primarily used to manufacture boiler drums, pressure vessel shells, and other pressure-bearing components operating under ambient and moderate-temperature conditions, commonly found in industries such as power generation, heating, and chemical processing.

2. Grade Designation Explanation

• S: Stands for Steel.
• B: Stands for Boiler, indicating steel intended for boilers and pressure vessels.
• 410: This number does not have a specific chemical meaning; it simply denotes a specific grade within the JIS G 3103 standard, whose specified minimum tensile strength is approximately 410 MPa. Higher strength grades like SB450 also exist in this standard.

3. Physical Properties
Typical room temperature mechanical properties of SB410 (specific values vary with plate thickness and heat treatment condition):

• Tensile Strength: ≥ 410 MPa
• Yield Strength: ≥ 245 MPa
• Elongation: ≥ 21% (depends on sample type and thickness)
• Modulus of Elasticity: Approximately 200 GPa
• Density: Approximately 7.85 g/cm³

4. Chemical Properties
Chemical composition requirements for SB410 (mass percent, maximum unless specified):

• C (Carbon): 0.24
• Si (Silicon): 0.35
• Mn (Manganese): 0.90
• P (Phosphorus): 0.035
• S (Sulfur): 0.035

The composition is designed with low carbon and moderate silicon/manganese content to ensure sufficient strength while prioritizing excellent weldability, cold workability, and toughness.

5. Application Fields
SB410 is primarily used for manufacturing welded pressure vessel structures not subjected to severe cold working. Typical applications include:
Boiler Equipment: Drums (steam drums), headers, and furnaces for low-pressure boilers.
Pressure Vessels: Storage tanks, heat exchanger shells, separators in the petrochemical industry, and low-temperature pressure vessels (provided impact energy requirements are met).
General Structures: Can be used in construction, bridges, and other steel structures requiring good weldability.

6. Testing & Production Methods
Production Method: Smelted by converter or electric furnace and delivered in hot-rolled or normalized condition.
Heat Treatment: Usually supplied in the hot-rolled (SR) or normalized (N) condition, depending on thickness and requirements.
Testing Requirements: Each batch of plates must undergo mechanical tests (tensile, bend) and chemical analysis according to the JIS G 3103 standard. Charpy V-notch impact testing can be conducted upon request. The manufacturer provides inspection certificates complying with the standard.

7. Corresponding or Similar Steel Grades
Chinese Standard (GB): Q245R. This is the most direct corresponding grade for pressure vessel plates in China, with mechanical properties and chemical composition very close to SB410, and their application fields almost entirely overlap.
European Standard (EN): P265GH. This grade is generally equivalent in application and performance level to SB410 and is a common substitute material in European standards. Sometimes it can also correspond to P295GH (slightly higher strength).
American Standard (ASTM): SA285 Gr.C. Its strength grade (Tensile Strength ≥ 415 MPa) and applications are most similar to those of SB410.