JIS G 3116 SG295 Gas Cylinder Steel Coils/Sheets Material
JIS G 3116 SG295 Gas Cylinder Steel Coils/Sheets - High Strength & Safety for Pressure Vessels
Detailed material properties and equivalents for JIS G3116 SG295 steel used in high-pressure gas cylinders. Includes chemical composition, mechanical and physical properties, and global equivalents.
Shearing, blanking, deep drawing, welding, bending, forming
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JIS G 3116 SG295 Gas Cylinder Steel Coils/Sheets Introduction
SG295 is a hot-rolled steel grade specified in JIS G 3116, designed primarily for the manufacture of welded gas cylinders. It offers a minimum yield strength of 295 MPa and good weldability, ensuring reliable performance under internal pressure. The steel is supplied as coils or sheets in various thicknesses and is suitable for forming processes such as deep drawing and bending. Its controlled chemical composition (low carbon equivalent) ensures toughness and resistance to brittle fracture even at low ambient temperatures. The material is used for containing liquefied petroleum gas (LPG), acetylene, and other industrial gases, meeting stringent safety regulations.
JIS G 3116 SG295 Gas Cylinder Steel Coils/Sheets Chemical Composition
The chemical composition of SG295 is tightly controlled to ensure adequate weldability and strength. Maximum limits are specified for carbon, silicon, manganese, phosphorus, and sulfur. These values are in accordance with JIS G 3116 standard.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.20 | max |
| Silicon (Si) | ≤ 0.35 | max |
| Manganese (Mn) | ≤ 1.00 | max |
| Phosphorus (P) | ≤ 0.040 | max |
| Sulfur (S) | ≤ 0.040 | max |
JIS G 3116 SG295 Gas Cylinder Steel Coils/Sheets Thermal and Electrical Physical Properties
The following physical properties are typical for low carbon steel similar to SG295. These values are not specified in JIS G 3116 but are representative for design and engineering calculations. They may vary slightly with temperature and processing.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of elasticity (E) | 206 | GPa | 20°C |
| Shear modulus (G) | 79 | GPa | 20°C |
| Poisson's ratio (ν) | 0.29 | – | 20°C |
| Thermal expansion coefficient (α) | 11.7 × 10⁻⁶ | 1/K | 20–100°C |
| Thermal conductivity (λ) | 51.9 | W/(m·K) | 20°C |
| Specific heat capacity (cₚ) | 486 | J/(kg·K) | 20°C |
| Electrical resistivity (ρₑ) | 0.142 | µΩ·m | 20°C |
JIS G 3116 SG295 Gas Cylinder Steel Coils/Sheets Mechanical Properties
Mechanical properties of SG295 are guaranteed at room temperature. The table lists the minimum yield strength, tensile strength, elongation, and bend test requirements as per JIS G 3116. Test pieces and gauges vary with product thickness. Note that impact toughness is not explicitly required in the standard but the steel exhibits good toughness due to its controlled chemistry.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 295 | MPa | Room temperature |
| Tensile Strength (Rm) | ≥ 440 | MPa | Room temperature |
| Elongation (A) | ≥ 26 | % | Thickness ≤ 5 mm (JIS No.5 specimen) |
| Elongation (A) | ≥ 20 | % | 5 mm < thickness ≤ 20 mm (JIS No.1A specimen) |
| Elongation (A) | ≥ 20 | % | Thickness > 20 mm (JIS No.10 specimen) |
| Bend Test (180°) | Bend radius = 2.0t | – | Thickness ≤ 6.0 mm |
| Bend Test (180°) | Bend radius = 2.5t | – | Thickness > 6.0 mm |
JIS G 3116 SG295 Gas Cylinder Steel Coils/Sheets Directly Equivalent Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10120 | P295NB | Welded gas cylinders; similar yield and tensile requirements |
| International | ISO 4978 | P295NB | Equivalent to EN 10120 |
| USA | ASTM A414/A414M | Grade D | Pressure vessel quality steel, similar strength, but not specifically for gas cylinders; verify full compliance |
| China | GB 6653 | HP295 | Gas cylinder steel with comparable strength |
JIS G 3116 SG295 Gas Cylinder Steel Coils/Sheets Application Introduction
SG295 is optimized for welded gas cylinder production. Its controlled rolling and chemistry allow excellent formability and weldability. The steel is suitable for deep drawing and is often subjected to normalizing after forming to refine grain structure and ensure uniform mechanical properties. Applications demand consistent thickness tolerance and surface quality to guarantee safe pressure containment.
Product Applications: Welded LPG cylinders (residential and commercial), Acetylene cylinders, High-pressure industrial gas cylinders, Fire extinguisher bodies, Small portable gas cartridges
Processed into products: Cylinder body shells (deep drawn or rolled and welded), Cylinder bottoms and heads (formed and welded), Valve bosses and neck rings (machined from plate), Foot rings and protective shrouds (formed strip)
Application industries: Gas storage and distribution (LPG, acetylene, oxygen, nitrogen), Fire protection equipment (fire extinguisher bodies), Automotive (CNG and hydrogen tanks), Medical and industrial gas supply
JIS G 3116 SG295 Gas Cylinder Steel Coils/Sheets Similar / Comparable Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G 3101 | SS400 | General structural steel, similar tensile strength but lower guaranteed yield; not for pressure vessels |
| International | ISO 630-2 | S275JR | Structural steel with similar strength; not certified for gas cylinders |
| Europe | EN 10025-2 | S275JR | Hot-rolled structural steel; not designed for pressure containment |
| USA | ASTM A36/A36M | A36 | Common structural steel; insufficient for gas cylinder applications due to lower yield and lack of toughness requirements |
Notes:
JIS G 3116 also contains grades SG255 and SG325 with adjusted strength levels. SG295 is the most commonly used grade for LPG cylinders. When ordering, specify the required coating (pickled and oiled, or mill finish) and dimensional tolerances as per JIS G 3116. For high-pressure hydrogen service or low-temperature applications, supplementary toughness tests (e.g., Charpy V-notch) may be agreed upon.
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