SB450 Steel | Pressure Vessel Steel
SB450 Steel | Pressure Vessel Steel
SB450 steel is a high-strength structural steel used in various applications. The name “SB450” indicates its yield strength of 450 MPa. Its aliases include equivalent grades like S355J2 and Q345B. This steel offers excellent weldability, machinability, and toughness. It is commonly used in construction, shipbuilding, and machinery manufacturing due to its ability to withstand heavy loads. Equivalent grades include S355J2 (EN), Q345R (GB), P235GH, and ASTM A515-65.
We provide SB 450, SB 410, and SB 480 products (sb410 steel plate) per standard JIS G 3103, with 6-150 mm thicknesses, widths of 900-4800 mm, and lengths of 3000-25000 mm.
Description
What is SB450 Steel?
SB450 is a high-strength low-alloy structural steel, primarily composed of about 98% iron with alloying elements like manganese, silicon, and nickel, produced in a hot-rolled form under the JIS G3103 standard. It exhibits excellent weldability, machinability, and toughness, making it suitable for critical applications such as pressure vessels, liquefied natural gas (LNG) storage tanks, boilers, and chemical equipment. Additionally, it is used in construction and machinery manufacturing.Characteristics of SB450 Steel
SB450 steel features excellent weldability and low-temperature toughness, with a minimum yield strength of 245 MPa. It offers higher strength and corrosion resistance compared to traditional pressure vessel steels, making it suitable for demanding applications. This steel is often used in pressure vessels, LNG storage tanks, boilers, and chemical equipment. Alternative grades such as A516 Grade 70, A537 Class 1, and SA662 provide enhanced toughness, better corrosion resistance, and improved mechanical properties, making them suitable substitutes for critical applications.Chemical Compositions
| Element | Content (%) |
|---|---|
| Iron, Fe | ~98 |
| Manganese, Mn | 1.0 – 1.5 |
| Silicon, Si | 0.2 – 0.5 |
| Nickel, Ni | 0.5 – 1.0 |
| Carbon, C | ≤ 0.2 |
| Phosphorus, P | ≤ 0.03 |
| Sulfur, S | ≤ 0.02 |
Physical Properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Point | 1450°C | 2642°F |
| Boiling Point | 2870°C | 5200°F |
| Thermal Conductivity | 50 W/m·K | 34.5 BTU·in/(hr·ft²·°F) |
| Electrical Conductivity | 1.2 x 10^6 S/m | 0.12 x 10^6 S/m |
| Specific Heat Capacity | 0.49 J/g·K | 0.12 BTU/lb·°F |
| Thermal Expansion Coefficient | 11 x 10^-6 /K | 6.1 x 10^-6 /°F |
| Electrical Resistivity | 0.008 Ω·m | 0.000012 Ω·ft |
Mechanical Properties
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 490 MPa | 71,000 psi |
| Yield Strength | 245 MPa | 35,500 psi |
| Brinell Hardness | 170 HB | 170 HB |
| Rockwell Hardness | 80 HRB | 80 HRB |
| Vickers Hardness | 160 HV | 160 HV |
| Elongation | 20% | 20% |
| Elastic Modulus | 210 GPa | 30,500,000 psi |
Data After QT(Quenching and Tempering) Processing
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 620 MPa | 90,000 psi |
| Yield Strength | 350 MPa | 50,000 psi |
| Brinell Hardness | 220 HB | 220 HB |
| Rockwell Hardness | 90 HRB | 90 HRB |
| Vickers Hardness | 210 HV | 210 HV |
| Elongation | 15% | 15% |
| Elastic Modulus | 210 GPa | 30,500,000 psi |
Industries & Applications
| Industries | Products |
|---|---|
| Power Generation | Boilers, turbines, piping systems, heat exchangers, reactor vessels |
| Shipbuilding | Hull plates, decks, piping systems, ballast tanks, cargo holds |
| LNG Storage | LNG tanks, insulation systems, piping, loading arms, containment structures |
| Machinery Manufacturing | Machine frames, gear housings, shafts, pressure vessels, components for heavy machinery |
| Oil and Gas | Pressure vessels, pipelines, storage tanks, offshore platforms, refining equipment |
| Chemical Processing | Reactors, heat exchangers, storage tanks, mixing vessels, piping systems |
| Construction | Structural beams, bridges, support frames, reinforcement bars, cladding materials |
Machining
SB450 Heat Treatment:
- Heating: Heat the steel to 850°C – 900°C (1562°F – 1652°F) and maintain at this temperature to ensure uniform austenitization.
- Quenching: Rapidly cool in water or oil to room temperature to increase hardness and strength.
- Tempering: Reheat to 550°C – 650°C (1022°F – 1202°F) to reduce brittleness and enhance toughness.
SB450 Surface Finish
- Shot Blasting: Removes impurities, improves surface finish, and prepares for coating.
- Pickling: Eliminates surface oxides and enhances corrosion resistance.
- Electroplating: Adds a protective metal layer to improve wear and corrosion resistance.
- Galvanizing: Coats with zinc to prevent rusting and increase durability.
- Polishing: Provides a smooth surface with improved aesthetics and resistance to contamination.
- Painting or Coating: Adds a protective layer to prevent corrosion and extend service life.
Custom surface treatment requirements can be accommodated upon request.
Disclaimer
The above heat treatment instructions and surface finish processing methods for Mn13 steel are provided for informational purposes only. Actual results may vary based on specific conditions and equipment used. Testing is recommended, and a metallurgical expert or material supplier should be consulted to ensure the processes are suitable for your specific application. The user assumes all risks and liability for the use of this information.
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