SG295 is a structural hot-rolled steel grade defined by the Japanese standard JIS G 3116, primarily used for gas cylinders and pressure vessels. Below is a detailed overview of its chemical composition, standards, and properties based on available information.
Chemical Composition
The chemical composition of SG295 steel, as specified by JIS G 3116, is as follows (maximum percentages):
Carbon (C): 0.20%
Silicon (Si): 0.35%
Manganese (Mn): 1.00%
Phosphorus (P): 0.040% (often cited as 0.03% in some sources)
Sulfur (S): 0.040% (often cited as 0.03% in some sources)
Iron (Fe): Balance, with negligible impurities
These values ensure SG295 has good weldability and impact resistance, suitable for gas cylinder applications.
Standards
SG295 is governed by the JIS G 3116 standard, which specifies requirements for hot-rolled steel plates, sheets, and strips used in welded gas cylinders and gas vessels. Equivalent international grades include:
European (EN): P265NB (1.0423), P265GH (1.0425)
Other equivalents: EN10120 P265NB, DIN17155 HII, NFA 36-211 BS2, UNI 7355 FE E27KR, BS 5045 Type B, UNE 36129 AE265KR
These equivalents may vary slightly in composition or properties, so verification through material testing is recommended for specific applications.
Mechanical Properties
The mechanical properties of SG295 steel, as per JIS G 3116, include:
Tensile Strength: Minimum 440 MPa (N/mm²)
Yield Strength: Minimum 295 MPa (varies with thickness)
Elongation: Typically ranges from 26–28% (dependent on thickness and test conditions)
Density: Approximately 7.85 g/cm³ (standard for low-carbon steels)
Hardness: Not explicitly specified in JIS G 3116, but typical values for similar low-carbon steels include Brinell (HB), Rockwell (HRB), or Vickers (HV) hardness, which can be tested as needed.
The steel’s properties make it suitable for applications requiring a balance of strength, ductility, and weldability, particularly for high-pressure gas containers like those for liquefied petroleum gas (LPG) or acetylene.
Physical Properties
Form: Available as plates, sheets, strips, or coils
Thickness: 1.5 mm to 25 mm
Width: Typically 600 mm to 2500 mm
Delivery Condition: Hot-rolled (HR), annealed (AR), or as specified
Applications
SG295 is primarily used for manufacturing welded gas cylinders and pressure vessels with a net volume below 500 liters. Its high strength and good impact resistance make it ideal for containing gases such as LPG, acetylene, and various fluorine gases. The steel’s properties also support processing like cutting, drilling, welding, and milling.
Verification: Chemical and mechanical properties may vary slightly depending on the supplier or specific production batch. Always verify with material testing for critical applications.
Suppliers: Companies like Shanghai Katalor and Bebon International stock SG295 and offer processing services. For pricing or availability, contact suppliers directly.
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