HP295 is a specialized low-carbon, hot-rolled steel used for manufacturing welded gascylinders (LPG, oxygen, acetylene) due to its high tensile strength (> 295 MPa), excellentductility, and weldability. It is ideal for, but not limited to, household (6kg-50kg) andindustrial cylinders, commonly ranging from 2.0mm to 14mm inthickness.
HP295 steel
When manufacturing high-pressure cylinders for various applications (such as storing gases, liquid nitrogen, or LPG), selecting the right material is critical to ensure safety, performance, and longevity. HP295 steel is one of the preferred materials used for high-pressure cylinders due to its robust mechanical properties and versatility.
Chemical Composition of HP295 Steel
Low carbon (C ≤ 0.20%): The lower carbon content ensures good weldability and low-temperature toughness of the steel. The manufacture of welded gas cylinders involves a large amount of circumferential and longitudinal welding, making low weld crack sensitivity a primary requirement.
Manganese (Mn 0.80~1.00%): As a solid solution strengthening element, manganese effectively compensates for the strength loss caused by carbon reduction while improving the steel's strength, and expands the austenite phase region, improving heat treatment performance.
Microalloying (Nb, Ti): In modern metallurgical processes, HP295 typically incorporates trace amounts of niobium (Nb) and titanium (Ti). These elements combine with carbon and nitrogen to form carbonitrides, which pin grain boundaries and refine grains during hot rolling. This refined grain structure is key to HP295 achieving high yield strength and excellent low-temperature impact toughness.
| Element | Content (%) |
|---|---|
| C | ≤ 0.18 |
| Si | ≤ 0.10 |
| Mn | ≤ 1.00 |
| P | ≤ 0.025 |
| S | ≤ 0.015 |
| Als | As required |
Mechanical Properties of HP295 Steel Plate
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 295 |
| Tensile Strength (MPa) | 440 – 560 |
| Elongation (%) (t < 3mm) | ≥ 20 |
| Elongation (%) (t ≥ 3mm) | ≥ 26 |
Available Sizes & Supply Capability of HP295 Steel
Thickness: 1.5 mm – 12 mm
Width: Customizable
Form: Steel plate & hot rolled coil
Monthly Supply: Up to 5000 tons
Coil Thickness Note: Typically supplied in thin gauge for forming processes
Typical Sizes of HP295 Welded Gas Cylinders
| Nominal Weight | Outer Diameter (mm) | Height (mm) | Wall Thickness (mm) | Typical Material | Working Pressure (MPa) |
|---|---|---|---|---|---|
| 2kg | 210 | 260 | 1.8 | HP295 | 1.8 - 2.1 |
| 5kg | 230 | 420 | 2.3 | HP295 | 2.1 |
| 11kg | 300 | 566 | 2.5 | HP295 | 2.1 |
| 12.5kg | 300 | 590 | 2.3 | HP295 | 2.1 |
| 15kg | 320 | 676 | 2.75 | HP295 | 2.1 |
| 50kg | 406 | 1200 | 3.4 | HP295 | 2.1 |
Why Choose HP295 for High-Pressure Cylinders?
HP295 steel is an ideal material for high-pressure storage cylinders due to several inherent properties that ensure performance under demanding conditions.
High Yield Strength: HP295 exhibits excellent yield strength, which allows the steel to withstand high internal pressures without permanent deformation. This is essential for pressure vessels, where the material must maintain structural integrity under extreme conditions.
Ductility and Toughness: HP295 steel retains high ductility even at low temperatures, making it less prone to cracking or failure when subjected to rapid pressure changes or impacts.
Corrosion Resistance: HP295 has superior resistance to corrosion, ensuring that it performs well in environments with exposure to moisture, chemicals, or gases.
HP295 For High-Pressure Cylinders
Excellent Weldability: HP295 steel is designed to be easy to weld, which is important for the fabrication of high-pressure cylinders. Strong and reliable welds are necessary to maintain the strength and safety of the pressure vessel.
Impact Resistance: HP295 maintains its impact resistance under both normal and low-temperature conditions, reducing the risk of cracks or fractures in high-pressure applications.
Fatigue Resistance: The material exhibits resistance to fatigue, making it suitable for vessels that experience repeated pressurization and depressurization cycles.
Bottle Size Options for HP295 High-Pressure Cylinders
The size of high-pressure cylinders plays an important role in their application. The size of the cylinder will depend on the type of gas being stored, its intended use, and the required storage capacity. HP295 steel can be used to manufacture cylinders of various sizes, tailored to the requirements of specific industries.
Small Cylinders (up to 50L)
Volume: These are small gas cylinders with capacities ranging from 1L to 50L, commonly used in industrial applications where portability and ease of handling are required.
Pressure Rating: Small cylinders are typically designed for pressures up to 200 bar (2900 psi), depending on the specific application.
Medium-Sized Cylinders (50L to 200L)
Volume: Medium-sized cylinders range from 50L to 200L, suitable for industries that require moderate gas storage, such as in chemical processing, welding, and various industrial applications.
Pressure Rating: These cylinders often have pressure ratings ranging from 150 to 300 bar (2200 to 4400 psi), depending on the design and type of gas.
HP295 High-Pressure Cylinders
Large Cylinders (200L to 1000L)
Volume: Large cylinders typically have a capacity of 200L or more, and can go up to 1000L or more in some cases.
Pressure Rating: These cylinders are designed to withstand higher pressures, typically ranging from 150 to 350 bar (2200 to 5000 psi), depending on the size and intended use.
Jumbo Cylinders (1000L and above)
Volume: Jumbo cylinders are typically designed for bulk storage and are usually over 1000L in capacity. These cylinders are used when large amounts of gas need to be stored.
Pressure Rating: The pressure ratings for these cylinders can vary from 150 bar to 350 bar (2200 to 5000 psi), depending on the specific use case and design specifications.
Conclusion
HP295 welded gas cylinder steel offers an excellent combination of strength, weldability, corrosion resistance, and impact resistance, making it an ideal material for high-pressure cylinders. Whether for small-scale portable cylinders or large-scale industrial tanks, HP295 ensures safety and durability under a variety of demanding conditions.
The choice of cylinder size depends on the specific requirements of the application, such as the type of gas being stored, required storage capacity, and the safety regulations governing the operation. By offering flexibility in design, HP295 enables manufacturers to produce cylinders in a wide range of sizes, from small bottles to large jumbo cylinders, all while maintaining consistent performance and safety.
At GNEE, we produce HP295 welded gas cylinders steel that adheres to strict standards. Our manufacturing process involves fine-grain treatment, which ensures that the steel maintains high toughness even in low-temperature environments. This makes it the preferred choice for manufacturers producing medium-sized LPG cylinders for both domestic and industrial use.
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What thickness and size ranges are available for HP295 steel?
HP295 steel is typically available in thicknesses ranging from 1.5 mm to 20 mm, with widths from 1000 mm to 2500 mm, and lengths that can be customized according to production needs. For gas cylinder manufacturing, thinner specifications are more commonly used.
What welding methods work with HP295?
HP295 works with MAG (CO₂+Ar shielding), submerged arc welding (SAW), and plasma welding. No preheating is typically required due to the low carbon equivalent.
What thickness is available?
HP295 is available from 1.5 mm to 20 mm thickness. LPG cylinders typically use 2.5-3.5 mm depending on capacity.
Does HP295 perform in cold climates?
Yes. With low P/S content and fine-grain microstructure, HP295 maintains ductility and impact toughness even at sub-zero temperatures, verified by Charpy V-notch testing at 0°C (≥27J).
What is the typical service life?
HP295 cylinders are designed for 10-15 years of service with proper maintenance, including resistance to fatigue from thousands of refill cycles.
Is HP295 recyclable?
Yes. Steel is 100% recyclable, and end-of-life HP295 cylinders can be melted down to produce new steel products.
