JIS G3116 SG295 Steel Coil for Gas Cylinders
JIS G3116 SG295 Steel Coil for Gas Cylinders - Properties, Equivalents & Applications
Comprehensive material data for JIS G3116 SG295 steel coil used in welded gas cylinders. Includes chemical composition, mechanical properties, thermal & physical properties, equivalent grades and application guide.
Hot rolling, Pickling, Oiling, Shearing, Slitting
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JIS G3116 SG295 Steel Coil for Gas Cylinders Introduction
JIS G3116 SG295 is a hot-rolled steel coil specifically designed for the manufacture of welded gas cylinders for high-pressure gases. It is characterized by a minimum yield strength of 295 MPa, good weldability, and reliable formability. The steel is typically produced as aluminum-killed fine-grain steel to ensure uniform mechanical properties and satisfactory deep-drawing characteristics. It is supplied in coil or cut sheet form and is widely used in LPG cylinders, industrial gas containers, and similar pressure vessels. The material meets the strict requirements for safety and durability under pressurized conditions.
JIS G3116 SG295 Steel Coil for Gas Cylinders Chemical Composition
The chemical composition of SG295 is controlled to ensure appropriate strength, toughness, and weldability. The limits are defined in JIS G3116. All values are in weight percent (%). Aluminum is usually added to fully killed the steel for grain refinement, but no minimum content is mandatory in the standard.
| Element | Standard Value (max, unless range) | Remarks |
|---|---|---|
| Carbon (C) | 0.20 | Controls strength and weldability |
| Silicon (Si) | 0.35 | Deoxidizer; contributes to strength |
| Manganese (Mn) | 1.00 | Improves hardenability and strength |
| Phosphorus (P) | 0.040 | Upper limit to prevent embrittlement |
| Sulfur (S) | 0.040 | Upper limit to maintain ductility |
| Aluminum (Al) | Not specified (≥0.020 usually for killed steel) | Typically added for grain refinement |
JIS G3116 SG295 Steel Coil for Gas Cylinders Thermal and Electrical Physical Properties
The following physical properties are typical for carbon steel and are not mandatory requirements of JIS G3116. They are provided for design calculations such as heat transfer, thermal expansion, and stress analysis. Actual values may slightly vary depending on exact manufacturing conditions.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | 207 | GPa | At 20 °C |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.30 | - | Typical for structural steel |
| Thermal Expansion Coefficient (α) | 11.7 × 10-6 | 1/K | Between 20 °C and 100 °C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 20 °C |
| Specific Heat Capacity (c) | 486 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρe) | 0.15 – 0.25 | μΩ·m | At 20 °C |
JIS G3116 SG295 Steel Coil for Gas Cylinders Mechanical Properties
Mechanical properties are determined on test pieces prepared from the supplied condition. Yield strength and tensile strength are minimum requirements, while elongation depends on the specimen type and thickness (JIS No.5 test piece for thickness < 5 mm). Bend test guarantees formability without cracking.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH or Rp0.2) | ≥ 295 | MPa | As-supplied, transverse |
| Tensile Strength (Rm) | ≥ 440 | MPa | As-supplied, transverse |
| Elongation (A) – thickness ≤ 1.6 mm | ≥ 26 | % | JIS No.5 test piece, gage length 50 mm |
| Elongation (A) – 1.6 < t ≤ 2.0 mm | ≥ 29 | % | JIS No.5 test piece |
| Elongation (A) – 2.0 < t ≤ 2.5 mm | ≥ 31 | % | JIS No.5 test piece |
| Elongation (A) – 2.5 < t ≤ 3.15 mm | ≥ 32 | % | JIS No.5 test piece |
| Elongation (A) – 3.15 < t ≤ 4.0 mm | ≥ 33 | % | JIS No.5 test piece |
| Elongation (A) – thickness > 4.0 mm | ≥ 18 | % | JIS No.1A or No.10 test piece |
| Bend Test (Bend diameter) | 0.5 × thickness | - | 180° bend, no cracks on outside surface |
JIS G3116 SG295 Steel Coil for Gas Cylinders Direct Equivalents – Material Standards and Replaceable Grades
The table below lists grades that are considered technically identical or directly interchangeable with SG295 according to international standards. The primary reference is JIS G3116 SG295 itself.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3116 | SG295 | Original standard; baseline for equivalence |
| China | GB/T 6653 | HP295 | Equivalent chemical and mechanical requirements, widely accepted substitution |
| International | ISO 4978 | P265NB | Similar category but slightly lower minimum yield (265 MPa); often acceptable as supplier alternative |
JIS G3116 SG295 Steel Coil for Gas Cylinders Application Introduction
SG295 steel coil is predominantly used in the production of welded gas cylinders because of its excellent balance of strength, formability, and weldability. The material is suitable for deep drawing and hot forming operations required to manufacture cylinder bodies and bases. Below are typical industries, products, and specific components made from this steel.
Product Applications: LPG cylinders for domestic and commercial use, Seamless and welded refillable industrial gas cylinders, Disposable refrigerant containers, CNG vehicle cylinders (Type 1), Portable fire extinguisher bodies
Processed into products: Cylinder body (deep-drawn shell), Cylinder base and foot ring, Cylinder collar and neck ring, Protective guard/shroud, Welded assembly of cylinder halves (two-piece construction)
Application industries: Liquefied Petroleum Gas (LPG) cylinder manufacturing, Industrial gas packaging and distribution, Firefighting equipment (portable extinguishers), Automotive (CNG and hydrogen fuel tanks), Medical gas storage and supply systems
JIS G3116 SG295 Steel Coil for Gas Cylinders Similar or Alternative Materials
When SG295 is not available, the following grades offer similar property profiles and may be considered after engineering evaluation. Differences in yield strength, chemical composition, or ductility must be assessed for the specific application.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3116 | SG255 | Lower yield strength (≥255 MPa); used for less demanding cylinders |
| Japan | JIS G3116 | SG325 | Higher yield strength (≥325 MPa); for higher pressure or thinner walls |
| USA | ASTM A414/A414M | Grade D | Yield ≥275 MPa, tensile ≥415 MPa; not fully identical but close in practice |
| EU | EN 10120 | P310NB | Yield ≥310 MPa, tensile 440–550 MPa; can be a substitute with slightly higher strength |
Notes:
Additional Remarks: SG295 is typically supplied in the hot-rolled condition and may require deseaming or edge trimming to eliminate surface defects. The steel is intended for welded construction only; it is not recommended for seamless cylinder processes. For cold forming or extreme deep-drawing applications, a normalizing heat treatment may be performed before forming. Consult the mill for guaranteed mechanical properties after stress-relief annealing if post-weld heat treatment is applied. This material must comply with statutory regulations for pressure vessel manufacturing in the intended country of use.
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