JIS SG255 is a Japanese steel grade for welded cylinders (Japanese standard JIS G3116: Steel sheet, plates and strip for gas cylinders). JIS G3116 SG255 steel is equivalent to Chinese welded cylinder steel HP265 (Chinese standard GB6653: Steel plates and strips for welded gas cylinders). The JIS G3116 SG255 steel plate sheet and coil is required to have good stamping and welding performance.
Chemical composition of JIS G3116 SG255 steel plate sheet and coil:
| Grade | C | Si | Mn | P | S |
| SG255 | ≤0.20 | - | ≥0.30 | ≤0.030 | ≤0.030 |
Mechanical properties of JIS G3116 SG255 steel plate sheet and coil:
| Grade | Yield strength | Tensile strength | Elongation |
| SG255 | ≥255 | ≥400 | ≥28 |
JIS G3116 SG255 steel equivalent grades:
| Japan | EU | Germany | France | England | Italy | Spain | Chinese |
| JIS | EN | DIN | AFNOR | BS | UNI | UNE | GB |
| SG255 | P245NB (1.0111) | HI | BS1 | Type A | FeE24KR | AE235KR | HP265 |
JIS G3116 SG255 steel plate sheet and coil is used to fabricate low temperature pressure vessels like gas cylinder, which is designed to store LP gas, acetylene and other types of high-pressure gas.
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