JIS G3116 SG255 Steel Coil for Gas Cylinders
JIS G3116 SG255 Steel Coil for Gas Cylinders - Properties & Applications
Comprehensive material data for JIS G3116 SG255 steel coil used in welded gas cylinders. Includes chemical composition, mechanical and physical properties, international equivalents, and application guide.
Cold forming, hot forming, welding, stamping, deep drawing
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JIS G3116 SG255 Steel Coil for Gas Cylinders Introduction
JIS G3116 SG255 is a hot-rolled steel plate, sheet, and strip specifically designed for welded gas cylinders. This material exhibits excellent formability and weldability, ensuring the safety and reliability of high-pressure gas containment. With a minimum tensile strength of 255 N/mm² and guaranteed yield strength, it combines sufficient strength with good ductility. Its controlled chemical composition, particularly low carbon and manganese levels, promotes uniform mechanical properties after forming and welding. SG255 is widely adopted for liquefied petroleum gas (LPG) cylinders, industrial gas cylinders, and other pressure vessel applications requiring robust structural integrity under repeated pressurization cycles.
JIS G3116 SG255 Steel Coil for Gas Cylinders Chemical Composition
The chemical composition requirements for SG255 steel according to JIS G3116 are listed below. These limits are for ladle analysis. Low carbon and controlled manganese ensure good weldability and formability, while phosphorus and sulfur are restricted to avoid embrittlement and improve cleanliness.
| Element | Standard Value (max unless range) | Remarks |
|---|---|---|
| C | 0.20 | Max |
| Si | 0.35 | Max |
| Mn | 0.60 | Max |
| P | 0.040 | Max |
| S | 0.040 | Max |
JIS G3116 SG255 Steel Coil for Gas Cylinders Thermal and Electrical Physical Properties
JIS G3116 does not specify thermal or electrical properties. The following values are typical for low-carbon steel similar to SG255 and are provided for design reference. These may vary slightly depending on exact composition and processing.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At room temperature |
| Elastic Modulus (E) | 205 - 210 | GPa | In tension, at ambient temperature |
| Shear Modulus (G) | ≈ 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.29 - 0.30 | — | Elastic range |
| Thermal Expansion Coefficient (α) | 11.5 - 12.5 × 10⁻⁶ | /K | Average between 20°C and 200°C |
| Thermal Conductivity (λ) | 45 - 55 | W/(m·K) | At 20°C |
| Specific Heat Capacity | 450 - 500 | J/(kg·K) | At 20°C to 100°C |
| Electrical Resistivity (ρ_e) | 0.14 - 0.20 | Ω·mm²/m (or ×10⁻⁶ Ω·m) | At 20°C |
JIS G3116 SG255 Steel Coil for Gas Cylinders Mechanical Properties
Mechanical properties as specified in JIS G3116 for SG255 steel. Tensile testing is performed on standard specimens. Elongation requirements vary with thickness. Bend test demonstrates formability without cracking. Impact properties are not specified unless separately agreed.
| Property | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 205 | N/mm² | Applicable for thickness ≤ 16 mm; 0.2% proof stress may be used |
| Tensile Strength (Rm) | 255 - 365 | N/mm² | All thicknesses |
| Elongation (A) | ≥ 20 | % | Thickness < 3 mm, JIS No.5 specimen (gauge length 50 mm) |
| Elongation (A) | ≥ 26 | % | Thickness ≥ 3 mm to 6 mm, JIS No.5 specimen |
| Elongation (A) | ≥ 28 | % | Thickness > 6 mm, JIS No.5 specimen |
| Bend Test | 180° bent, d = 0.5t | — | Thickness < 3 mm, no cracks on outside surface |
| Bend Test | 180° bent, d = 1.0t | — | Thickness ≥ 3 mm, no cracks on outside surface |
JIS G3116 SG255 Steel Coil for Gas Cylinders Fully Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 4978 | SG255 | Identical nominal tensile strength and similar composition; designed for the same welded gas cylinder applications. |
JIS G3116 SG255 Steel Coil for Gas Cylinders Application Introduction
SG255 steel is engineered for the production of welded gas cylinders that store and transport pressurized gases. Its balanced strength and ductility permit efficient deep drawing, rolling, and welding operations. The material is typically delivered as hot-rolled coil or cut-to-length plate, then formed into cylinder bodies and heads by specialized stamping or rolling techniques.
- Resistant to internal pressure cycling and typical handling stresses.
- Accepts protective coatings (painting, galvanizing) for corrosion resistance.
- Suitable for automated mass production lines.
Product Applications: LPG cooking gas cylinders (domestic and commercial), Industrial gas cylinders (oxygen, nitrogen, argon, acetylene, CO₂), Fire extinguisher bodies and cartridges, Automotive CNG and hydrogen storage cylinders (Type 1), Refrigerant gas cylinders
Processed into products: Cylinder shell (welded body, seamless or two-piece welded construction), Cylinder head and bottom (shallow drawn, pressed domes), Neck ring and boss (welded attachments for valve), Foot ring and shroud (protective base and top ring), Longitudinal and circumferential welds (if multi-piece design)
Application industries: LPG distribution and storage, Industrial gas manufacturing and packaging, Fire protection equipment, Automotive alternative fuel systems (CNG), Medical oxygen cylinder production
JIS G3116 SG255 Steel Coil for Gas Cylinders Similar / Closest Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10120 | P245NB | Tensile strength 245-360 MPa, yield ≥235 MPa. Slightly lower minimum tensile but often interchangeable for gas cylinders after design verification. |
| China | GB 6653 | HP245 | Tensile strength ≥245 MPa, composition similar to JIS SG255. Substitute for low-pressure cylinders. |
| China | GB 6653 | HP255 | Tensile strength ≥255 MPa, closest Chinese grade to SG255; available mainly as plate and coil for cylinders. |
| USA | ASTM A414 | Grade F or G | Grade G has min tensile 278 MPa; lower grades may match after considering strength requirements. Not specifically for gas cylinders but used in general pressure vessels. |
Notes:
This data is based on JIS G3116:2020. Actual properties may be tailored by mill-supplied guarantees. Weldability is excellent with common arc welding processes (MAG, TIG, resistance seam welding). Post-weld heat treatment (PWHT) may be required depending on cylinder design standards. Hydrogen embrittlement resistance is not specifically assured; for hydrogen service, consult applicable codes (e.g., ISO 9809, ECE R110). Surface quality must be free from injurious defects per the standard to ensure cylinder integrity.
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