Performance And Application Of HP295 Steel Plate For Gas Cylinders

HP295 steel is equivalent to SG295 (JIS G3116, Japan) and P265NB (EN 10120, Europe). While SG295 has the same yield strength (≥295 MPa), HP295 offers higher elongation (≥26% vs ≥24%) and stricter P/S impurity control. P265NB has a lower yield strength (≥265 MPa) and typically requires a thicker cylinder wall.

HP295 steel plate is widely used to manufacture welded LPG (liquefied petroleum gas) cylinders, acetylene cylinders, oxygen cylinders, and liquid chlorine cylinders. The 15kg household LPG cylinder made from HP295 accounts for 98–99% of total gas cylinder production output.

HP295 steel has a yield-to-tensile ratio of ≤0.75 (typically 0.70–0.78). A low yield ratio means there is a wide margin between the stress at which the steel permanently deforms and the stress at which it ultimately fails. This provides a critical safety buffer for gas cylinders, which must not rupture suddenly under over-pressure conditions.

HP325 has a higher yield strength (≥325 MPa vs ≥295 MPa) and tensile strength (490–600 MPa vs 440–560 MPa), but lower elongation (≥21% vs ≥26% for t≥3mm). HP295 is preferred for standard small LPG cylinders where formability and cost are prioritized, while HP325 is used for higher-pressure or larger-volume cylinders requiring greater strength.

HP295 steel plate performs stably in environments ranging from −40°C to 60°C, meeting the safety requirements of gas cylinders across diverse global climate conditions — from cold northern winters to hot tropical regions.