Products Description
In modern industry, pressure vessels are essential for safely storing and transporting gases and liquids under pressure. Whether used in LPG storage, industrial gas supply, or fire protection systems, the material selection directly determines safety, durability, and cost efficiency.
H (Han/Welding): Indicates that the material is optimized for welding processes.
P (Ping/Cylinder): Indicates that its end use is in the manufacture of gas cylinders (pressure vessels).
295: Indicates that the minimum yield strength of this steel is 295 MPa.
HP295 Steel Pressure Vessel
As a professional steel manufacturer, GNEE supplies HP295 and a wide range of gas cylinder steels, helping global clients select the most suitable material for their applications.
Core performance table of HP295
| Element | Content (%) |
|---|---|
| C | ≤ 0.20 |
| Mn | 0.70–1.40 |
| Si | ≤ 0.35 |
| P | ≤ 0.025 |
| S | ≤ 0.015 |
The extremely low phosphorus and sulfur content eliminates the "hot brittleness" of steel during high-temperature welding and the "cold brittleness" in the harsh winter environment at the molecular level, preventing catastrophic brittle explosions of gas cylinders.
| Property | Value |
|---|---|
| Yield Strength | ≥ 295 MPa |
| Tensile Strength | 440–600 MPa |
| Elongation | ≥ 20% |
These properties ensure safe performance under internal pressure and deformation conditions.
Core Properties of HP295 Steel
Balance of Strength and Ductility
HP295 is a welded gas cylinder steel produced in accordance with GB 6653 standard, engineered to deliver an outstanding balance of mechanical strength and plastic ductility. This combination is critical for pressure-containing components such as LPG cylinders and industrial gas vessels.
Moderate strength ensures stable pressure-bearing capacity under working conditions.
High ductility allows controlled plastic deformation before failure, preventing sudden brittle rupture.
Excellent Formability
HP295 shows exceptional formability, making it highly suitable for cylinder forming processes including deep drawing, spinning, cold bending, and head stamping.
Key advantages:
- Low yield-to-tensile ratio supports smooth shaping without springback or cracking.
- High elongation (≥ 22%) enables large plastic deformation during manufacturing.
Superior Weldability
Welding quality directly determines the safety of pressure vessels. HP295 steel is specially designed for excellent weldability with low sensitivity to welding defects.
- Low carbon content (≤ 0.21%) reduces hardening tendency in the heat-affected zone (HAZ) and minimizes weld cracking.
- Fine and uniform microstructure ensures stable and consistent weld performance.
Compatible with mainstream welding processes: MAG, SAW, SMAW, and GTAW.
Good Impact Toughness
HP295 meets strict low-temperature impact toughness requirements for gas cylinder applications, ensuring reliable resistance to brittle fracture even in harsh environments.
Typically, HP295 achieves:
- Charpy V‑notch impact energy ≥ 27 J at -20°C
- Stable ductile‑to‑brittle transition behavior
- High resistance to impact loads during transportation and handling
Applications of HP295 Steel in Pressure Vessels
LPG Gas Cylinders
Household and industrial LPG storage
Requires good forming and weld integrity
Industrial Gas Cylinders
Oxygen (O₂), Nitrogen (N₂), Carbon dioxide (CO₂)
Requires pressure resistance and safety compliance
Fire Extinguishers
Portable and stationary fire suppression systems
Requires lightweight yet strong materials
Chemical Storage Tanks
Medium-pressure liquid or gas storage
Requires corrosion resistance (often with coatings)
Small to Medium Pressure Vessels
Used in manufacturing plants and processing industries
Advantages of Using HP295 Steel
✔ High Safety Reliability
Meets pressure vessel standards and reduces failure risks.
✔ Cost-Effective Solution
Lower cost compared to higher-strength steels like HP325 or HP345.
✔ Easy Processing
Good forming and welding reduce manufacturing complexity.
✔ Wide Availability
Commonly produced and globally supplied.
| Grade | Strength | Formability | Application |
|---|---|---|---|
| HP265 | Lower | Excellent | Small cylinders |
| HP295 | Medium | Excellent | Standard pressure vessels |
| HP325 | Higher | Good | Higher-pressure vessels |
| HP345 | High | Moderate | Heavy-duty applications |
Key Considerations When Selecting HP295
Certification & Standards
Compliance with GB/T 6653 or equivalent
Material Quality
Surface condition (no cracks, inclusions)
Uniform thickness
Impact Testing
Required for low-temperature applications
Supplier Capability
- Stable production
- MTC (Mill Test Certificate)
- Third-party inspection
Is HP295 suitable for high-pressure vessels?
It is best for medium-pressure applications. Higher grades like HP325 are preferred for very high pressure.
Can HP295 be used in cold climates?
Yes, if it meets low-temperature impact requirements.
Is HP295 better than Q345?
For pressure vessels, yes. HP295 is specifically designed for gas cylinder and pressure applications, offering better safety performance.
What industries commonly use HP295?
Energy and gas supply
Fire protection
Chemical processing
Manufacturing
Does HP295 require special welding?
No special processes are required, but proper welding procedures and qualified materials are recommended.
