Products Description
HP295 is the most widely used grade in the HP-series welded gas cylinder steel (GB/T 6653) and has long been the global default choice for refillable LPG, industrial gas, and portable pressure cylinders. Its dominance comes not from extreme strength or low cost alone, but from an unmatched balance of safety, manufacturability, cost, and reliability that no other grade can fully replace for mass-market refillable cylinders.
HP295 steel plate coil, as a specialized pressure vessel grade produced in strict accordance with GB/T 6653, is uniquely engineered to meet the harsh working conditions of repeatedly refilled cylinders.
Are you still unsure which grade is best for your upcoming project? Don't leave your material selection to chance. Contact GNEE today for a detailed technical consultation and a competitive quote on HP295 steel coil.Our team of experts is ready to help you optimize your production and ensure the highest safety standards for your products.
What Is The HP295 Steel Plate Coil ?
HP295 steel plate coil is a specialized hot‑rolled steel product produced in accordance with the national standard GB/T 6653, specifically designed and manufactured for the production of welded gas cylinders and pressure vessels.
As a high‑performance pressure‑bearing material, it features strictly controlled chemical composition, stable mechanical properties, excellent weldability and formability. With a minimum yield strength of 295 MPa, it provides reliable structural strength while maintaining sufficient ductility for deep drawing and bending processes.
It is mainly supplied in coil form to support high‑efficiency, automated production lines, and is widely used in manufacturing repeatedly refilled LPG cylinders, industrial gas cylinders, fire extinguishers and other medium‑pressure pressure equipment.
Chemical Composition of HP295 Steel Plate Coil
| Element | Max Limit (≤) | Min Limit (≥) |
|---|---|---|
| Carbon (C) | 0.18 | - |
| Silicon (Si) | 0.10 | - |
| Manganese (Mn) | 1.00 | - |
| Phosphorus (P) | 0.025 | - |
| Sulfur (S) | 0.015 | - |
| Acid-Soluble Aluminum (Als) | - | 0.015 |
| Carbon Equivalent (Ceq) | 0.22 | - |
Mechanical Properties of HP295 Steel Plate Coil
| Mechanical Property Items | Specification (Numerical Value) |
|---|---|
| Yield Strength (σₛ) | ≥295 MPa |
| Tensile Strength (σᵦ) | 410–530 MPa |
| Elongation (δ) | ≥25% |
| Cold Bending Performance | d=2a, no cracks |
| Impact Toughness | ≥30 J |
| Hardness (HB) | 130–170 |
The Critical Demands of Repeatedly Refilled Gas Cylinders
Stable and Sufficient Yield Strength Under Cyclic Pressure
Ensure the cylinder maintains stable pressure resistance after thousands of refilling and emptying cycles.
Prevent permanent expansion, bulging, or wall thinning during long-term cyclic loading.
Meet design safety factors and withstand working pressure (typically 2.0–3.2 MPa) reliably.
Yield strength ≥295 MPa provides a sufficient safety margin against overpressure during filling.
High Fatigue Resistance for Repeated Loading
Resist fatigue failure caused by frequent pressure fluctuations.
Avoid microcrack initiation and propagation in the cylinder wall after long-term use.
Extend service life to meet the standard requirement of 8–12 years for refillable cylinders.
Maintain structural integrity without performance degradation over years of repeated use.
HP295 Steel Plate Coil
Excellent Toughness to Prevent Brittle Fracture
Maintain good impact toughness in low-temperature environments (common in storage and transport).
Avoid sudden brittle fracture when dropped, impacted, or exposed to cold climates.
Ensure safe failure mode (ductile deformation rather than explosive rupture) in extreme cases.
Meet Charpy impact requirements to reduce risk of catastrophic failure.
Superior Formability for Deep-Drawing Cylinder Manufacturing
Withstand severe deep drawing, rolling, and flanging during cylinder production.
Resist cracking, tearing, or wrinkling in the stamping process.
Support high-volume automated production lines with high pass rates.
Provide sufficient elongation to adapt to various cylinder diameters and wall thicknesses.
HP295 steel plate coil has emerged as the industry-preferred solution precisely because it achieves an optimal balance of these often-competing properties.
If you want to konw more about HP295 steel plate coil,please contact us.
Consistent Performance of HP295 Steel Plate Coil
Dimensional Accuracy
- High-precision thickness control in hot-rolled/cold-rolled coils ensures uniform wall thickness of finished cylinders.
- Stable width and flatness reduce adjustment time in automated production lines and improve molding stability.
- Tight tolerance control reduces material waste and improves product consistency in large-scale manufacturing.
- Uniform coil geometry supports high-speed continuous production with high pass rates.
Processing Performance
- Stable stamping and forming performance ensures cylinders maintain the same shape, strength, and quality in mass production.
- Predictable and repeatable welding performance eliminates quality fluctuations caused by material variation.
- Consistent heat response and structural stability reduce defects such as cracking, springback, and deformation.
- Excellent process compatibility allows stable production with standard cylinder manufacturing equipment.
Processing Performance Of HP295 Steel Plate Coil
Service Performance
- Uniform fatigue resistance ensures reliable performance under thousands of repeated refilling cycles.
- Stable mechanical properties over long service life prevent early failure, bulging, or leakage.
- Consistent corrosion resistance and structural stability extend cylinder service life to meet standard requirements (8–12 years).
- Uniform safety performance meets global certification standards such as GB, ISO, CE, and DOT.
Batch Stability
- Mass production from large steel mills ensures stable quality between batches.
- Complete mill test certificates (MTC) provide traceable and consistent material data.
- Reliable supply chain guarantees consistent quality and delivery for long-term cylinder projects.
- Reduced production risks and quality complaints, strengthening product competitiveness.
Why Customers & Manufacturers Choose HP295
HP295 steel coil is preferred because it achieves:
- Adequate strength for refillable cyclic pressure
- Great formability & weldability for mass production
- Optimal cost without compromising safety
- Global standard recognition for domestic sales and export
- Proven reliability over decades of real-world use
As a premier steel factory in China with 20 years of experience, GNEE holds over 50,000 tons of ready stock in our warehouse, ensuring shipment within 7 days.In terms of quality, we are an API and ISO certified supplier and support third-party testing (SGS/BV/Lloyd's).We will provide you with a one-stop service including raw materials, design drawings and solutions, and landed costs.We are more happy to support your project.
Contact now to get gas cylinder steel plates Quote
What is the main application of HP295 steel plate coil?
It is mainly used for manufacturing LPG cylinders, industrial gas cylinders and pressure-bearing components, which can withstand repeated pressure loads and meet the safety requirements of pressure-bearing equipment.
What are the core mechanical properties of HP295 steel plate coil?
The minimum yield strength is ≥295MPa, the tensile strength is 410-530MPa, the elongation meets the deep drawing requirements, and there is no brittle fracture under normal use.
Does HP295 steel plate coil require preheating during welding?
No preheating is required. Its low carbon content and reasonable alloy ratio ensure good weldability, and no welding cracks will occur under standard processes.
What is the difference between HP295 steel plate coil and ordinary carbon steel coil?
HP295 has stricter impurity control, better toughness and pressure-bearing capacity, while ordinary carbon steel coil cannot meet the pressure-bearing safety requirements of gas cylinders.
Can HP295 steel plate coil be used for outdoor long-term storage?
Yes, but it needs to be protected by anti-corrosion coating. Without protection, it is easy to rust and affect the service life.
