JIS G3103 SB450 Steel Plate for Pressure Vessels & Boilers
JIS G3103 SB450 Steel Plate for Pressure Vessels & Boilers | Properties & Equivalents
Comprehensive data sheet for JIS G3103 SB450 steel plate: chemical composition, mechanical and thermal properties, international equivalents, and application guide for pressure vessel and boiler manufacturing.
Hot rolling, normalizing, stress relieving, cutting, forming, welding, machining
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
JIS G3103 SB450 Steel Plate for Pressure Vessels & Boilers Introduction
JIS G3103 SB450 is a carbon steel plate specifically designed for pressure vessels and boilers operating at moderate temperatures. It offers a good combination of strength and weldability, with a guaranteed tensile strength range of 450–590 MPa. The steel is typically supplied in the hot-rolled or normalized condition and is widely used in the fabrication of industrial boilers, storage tanks, and pressure vessels. Key features:
- Good notch toughness at ambient and slightly elevated temperatures
- Excellent formability and weldability
- Cost-effective solution for medium-strength pressure applications
- Compliant with Japanese Industrial Standard JIS G3103
JIS G3103 SB450 Steel Plate for Pressure Vessels & Boilers Chemical Composition
Chemical composition according to JIS G3103 standard. The steel is fully killed and silicon is added for deoxidation. Residual elements are controlled to ensure good weldability and toughness.
- For plates over 50 mm thickness, the maximum carbon content may be increased to 0.30%.
- Cu, Ni, Cr, and Mo may be present as residual elements, with typical maximum values of Cu ≤0.30%, Ni ≤0.30%, Cr ≤0.30%, Mo ≤0.08%.
| Chemical Element | Specified Value (max unless noted) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.28 | For thickness >50 mm, max 0.30 may be applied |
| Silicon (Si) | 0.15–0.30 | For deoxidation (killed steel) |
| Manganese (Mn) | ≤0.90 | Hot strength and toughness |
| Phosphorus (P) | ≤0.035 | Control for ductility |
| Sulfur (S) | ≤0.035 | Control for weldability |
JIS G3103 SB450 Steel Plate for Pressure Vessels & Boilers Thermal and Electrical Physical Properties
The following physical properties are typical for carbon steel plate similar to SB450. They are not mandatory requirements of the JIS standard but are provided for design calculations at room temperature unless otherwise noted. Properties may vary slightly depending on exact composition and heat treatment.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At room temperature |
| Modulus of Elasticity (E) | 205 | GPa | At room temperature |
| Shear Modulus (G) | 80 | GPa | At room temperature |
| Poisson's Ratio (ν) | 0.29 | – | At room temperature |
| Thermal Expansion Coefficient (α) | 11.5 | μm/m·°C | 20–100°C |
| Thermal Expansion Coefficient (α) | 12.5 | μm/m·°C | 20–200°C |
| Thermal Expansion Coefficient (α) | 13.5 | μm/m·°C | 20–300°C |
| Thermal Conductivity (λ) | 52 | W/m·K | At room temperature |
| Specific Heat Capacity (cp) | 460 | J/kg·K | At room temperature |
| Electrical Resistivity (ρe) | 0.17 | μΩ·m | At room temperature |
JIS G3103 SB450 Steel Plate for Pressure Vessels & Boilers Mechanical Properties
Mechanical properties are determined on test specimens taken in the transverse direction. Elongation values depend on specimen type (JIS No.1A or No.10). Bend test is performed at 180° with specified bend diameters to verify formability. Requirements may be adjusted by supplementary agreement for impact properties.
| Property | Specified Value | Unit | Test Condition / Thickness (t) |
|---|---|---|---|
| Yield Point / 0.2% Yield Strength | ≥225 | MPa | t ≤ 25 mm |
| Yield Point / 0.2% Yield Strength | ≥215 | MPa | 25 < t ≤ 50 mm |
| Yield Point / 0.2% Yield Strength | ≥205 | MPa | 50 < t ≤ 100 mm |
| Yield Point / 0.2% Yield Strength | ≥195 | MPa | 100 < t ≤ 200 mm |
| Tensile Strength | 450–590 | MPa | All thicknesses |
| Elongation (No.1A specimen, L=200 mm) | ≥28 | % | t ≤ 25 mm |
| Elongation (No.10 specimen, L=50 mm) | ≥30 | % | t ≤ 25 mm |
| Elongation (No.1A specimen) | ≥25 | % | 25 < t ≤ 50 mm |
| Elongation (No.10 specimen) | ≥28 | % | 25 < t ≤ 50 mm |
| Elongation (No.1A specimen) | ≥25 | % | 50 < t ≤ 100 mm |
| Elongation (No.10 specimen) | ≥27 | % | 50 < t ≤ 100 mm |
| Elongation (No.1A specimen) | ≥24 | % | t > 100 mm |
| Elongation (No.10 specimen) | ≥24 | % | t > 100 mm |
| Bend Test (180°, bend diameter) | 1.0 × t | mm | t ≤ 25 mm |
| Bend Test (180°, bend diameter) | 1.25 × t | mm | 25 < t ≤ 50 mm |
| Bend Test (180°, bend diameter) | 1.5 × t | mm | 50 < t ≤ 100 mm |
| Bend Test (180°, bend diameter) | 1.75 × t | mm | 100 < t ≤ 200 mm |
JIS G3103 SB450 Steel Plate for Pressure Vessels & Boilers Fully Equivalent Material Standards and Substitute Grades
| Country/Region | Standard & Grade | Notes |
|---|---|---|
| USA | ASTM A285 Grade C / ASME SA285 Gr. C | Lower tensile strength range (380-515 MPa); suitable for moderate pressure. |
| USA | ASTM A515 Grade 65 / ASME SA515 Gr. 65 | Closest match in tensile strength (450-585 MPa) and chemical composition; used for intermediate/high-temperature service. |
| European | EN 10028-2 P295GH | Similar strength level, also for pressure vessels; equivalent main application. |
| China | GB/T 713 Q245R | Carbon steel for boilers and pressure vessels; slightly lower strength but interchangeable for many applications. |
JIS G3103 SB450 Steel Plate for Pressure Vessels & Boilers Application Introduction
JIS G3103 SB450 steel is primarily employed in the fabrication of welded pressure vessels and boilers for process industries. It can be easily cut, formed, and welded using standard fabrication techniques. Post-weld heat treatment (PWHT) is often applied to relieve residual stresses and improve toughness in service. The steel is suitable for moderate-temperature applications, typically up to around 400°C, depending on design codes. Common uses are listed below.
Product Applications: Welded boilers and steam accumulators, Horizontal and vertical pressure vessels, LPG storage tanks, Heat exchanger shells and heads, Economizer casings
Processed into products: Boiler shell plates and drum cylinders, Dished heads and elliptical heads, Tube sheets, Nozzle reinforcement pads, Internal vessel supports and baffles, Skirt support structures
Application industries: Oil & Gas (refinery vessels, separators), Petrochemical (reactors, heat exchangers), Power Generation (boiler drums, steam generators), Chemical Processing (storage tanks, autoclaves), Pharmaceutical (sterilization vessels), Water Treatment (pressure filters)
JIS G3103 SB450 Steel Plate for Pressure Vessels & Boilers Similar / Near-Substitute Materials with Comparable Performance
| Country/Region | Standard & Grade | Notes |
|---|---|---|
| USA | ASTM A516 Grade 65 | Normalized carbon steel with improved low-temperature toughness; often used as a superior alternative when impact properties are critical. |
| European | EN 10028-2 P265GH | Widely used boilerplate; slightly lower tensile strength but excellent weldability and good availability. |
| European | EN 10028-3 P355N | Fine-grain normalized steel with higher yield strength; suitable for higher design stresses. |
| China | GB/T 713 Q345R | High-strength boiler steel; offers greater yield strength, often chosen for weight-saving designs. |
Notes:
When specifying SB450, users should consider supplementary requirements for impact toughness (e.g., Charpy V-notch at 0°C) if the vessel operates under low-temperature conditions. For thicknesses above 200 mm, consult the manufacturer for mechanical property adjustments. The steel is magnetic and can be inspected by conventional NDT methods. Welding consumables should be selected to match the base metal strength (E49XX type).
- Share
