Products Description
Both HP295 and HP345 conform to the GB/T 6653 standard, "Steel Plates and Strips for Welded Gas Cylinders." The "HP" in the grade designation represents "welded cylinder" (the first letters of the Chinese pinyin for steel used in welded gas cylinders), and the number indicates the minimum yield strength.
As a professional steel manufacturer, GNEE supplies HP295 and HP345 a wide range of gas cylinder steels, helping global clients select the most suitable material for their applications.
Comparative analysis of performance parameters
Comparison of chemical compositions
There are significant differences in the chemical composition design between HP295 and HP345, mainly reflected in the contents of elements such as carbon, silicon, and manganese:
| element | HP295 | HP345 |
|---|---|---|
| C | ≤0.18% | ≤0.20% |
| Si | ≤0.10% | ≤0.35% |
| Mn | ≤1.00% | ≤1.50% |
| P | ≤0.025% | ≤0.025% |
| S | ≤0.012% | ≤0.012% |
| Als) | ≥0.015% | ≥0.015% |
mechanical properties
| Performance indicators | HP295 | HP345 |
|---|---|---|
| Yield strength (min) | 295 MPa | 345 MPa |
| Range of tensile strength | 440~560 MPa | 510~620 MPa |
| Elongation (t≥3mm) | ≥26% | ≥21% |
| Elongation (t<3mm) | ≥20% | ≥17% |
| Yield ratio (typical value) | 0.67 | 0.68~0.70 |
| 180° bending test | d=2a | d=2a |
Strength Difference: HP345 has a yield strength 50 MPa higher (approximately 17%) and a lower limit of tensile strength 70 MPa higher than HP295. This means that under the same design conditions, HP345 can withstand higher internal pressure or allow for thinner wall thicknesses.
Plasticity Difference: HP295 requires an elongation of 5 percentage points (for thicker specifications) to 3 percentage points (for thinner specifications) higher than HP345. Higher plasticity means that HP295 has a larger deformation margin during stamping and coil forming, and a lower risk of forming cracks.
Yield Strength Ratio Difference: Although both grades require a lower yield strength ratio to ensure a safety margin, HP345's higher strength makes its yield strength ratio more difficult to control. In actual production, HP345's yield strength ratio is usually slightly higher than HP295.
Application scenarios of HP295 and HP345 welded gas cylinder steel
HP295 welded gas cylinder steel
Household Liquefied Petroleum Gas (LPG) Cylinders
HP295 is the mainstream material for manufacturing household LPG cylinders, covering sizes from 23.5L to 118L, and can withstand a test pressure of 2.36MPa. Its yield strength ≥295MPa and tensile strength 440-560MPa not only meet the daily gas needs of households but also achieve low-temperature toughness (impact energy ≥27J at -40℃) through optimized chemical composition (e.g., Als ≥0.015%), making it suitable for use in polar regions.
Industrial Gas Storage and Transportation Containers
In the chemical industry, HP295 is used to manufacture acetylene cylinders, liquid chlorine cylinders, etc. Its purity control (sulfur and phosphorus content ≤0.035%) reduces the risk of pitting corrosion. Combined with its molding performance verified by a 180° bending test (d=2.0a), it ensures the safety of the containers under complex working conditions.
Green Energy Supporting Equipment
With the popularization of new energy vehicles, HP295 has become a core material for vehicle-mounted LPG cylinders. Its 2.3mm ultra-thin products (such as the case of a steel mill's mass production of 1435mm wide products) achieve a 15% weight reduction per bottle by optimizing the rolling process (final rolling temperature 630±20℃), significantly reducing transportation energy consumption.
Close-up shot of the smooth surface finish of HP345 steel plates
HP345 Welded Gas Cylinder Steel
High-Pressure Process Gas Cylinders
HP345 is the preferred material for manufacturing welded cylinders for media such as liquid chlorine, liquid ammonia, and ethylene oxide. Its yield strength ≥345MPa and tensile strength 510-630MPa allow it to withstand higher internal pressures (test pressure up to 3.5MPa). For example, a steel mill in Shandong successfully used HP345 cylinder steel customized for a customer in industrial-grade cylinders containing liquid chlorine.
Specialty Gas Storage and Transportation
In the aerospace field, HP345 achieves grain refinement (grain size ≥9 grades) by optimizing the Ti content (0.02%-0.05%) to form dispersed TiC/TiN particles, meeting the storage requirements of high-purity gases (such as electronic-grade silane).
Extreme Condition Containers
For wide temperature range environments from -40℃ to 60℃, HP345 exhibits significant advantages in Charpy V-notch impact energy (≥36J) and yield strength ratio (≤0.85). For example, the HP345 steel cylinder developed by a certain company has been used continuously for 5 years in the extremely cold region of Mohe without any brittle fracture.
Application scenarios of HP345 welded gas cylinder steel
As a dedicated manufacturer, GNEE provides full Mill Test Certificates (MTC) with every order, detailing the exact chemical breakdown of your HP345 or HP295 shipment to ensure compliance with your project specifications.
Why GNEE is Your Trusted Partner for Gas Cylinder Steel
Choosing a supplier is about more than just a price per ton; it is about reliability, expertise, and quality assurance. GNEE stands out in the global market for several reasons:
- Manufacturer Advantage: As a direct factory, we control the entire production process from smelting to final cutting.
- Quality Assurance: Our products undergo rigorous testing, including ultrasonic testing, tensile tests, and impact tests.
- Global Reach: We have exported HP345 and HP295 steel to over 60 countries, understanding the specific regulatory needs of different regions.
- Customization: We offer customized thicknesses, widths, and lengths to minimize waste in your production line.
conclusion
The differentiation in application scenarios between HP295 and HP345 is essentially an art of balancing "cost and performance." In the civilian sector, HP295 is the mainstream, continuously expanding its boundaries through ultra-thinning and low-temperature technologies; while in the industrial sector, HP345's high strength and high toughness are relied upon to break through in extreme pressure and complex working conditions. In the future, with the application of Materials Genome Initiatives (MGI), the performance boundaries of these two steel grades may be redefined.
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What is HP295 gas cylinder steel used for in cylinder manufacturing?
HP295 gas cylinder steel is mainly used for LPG cylinders, industrial gas cylinders, and pressure vessels due to its high strength and ductility.
What is the yield strength of HP295 gas cylinder steel?
The yield strength of HP295 gas cylinder steel is ≥295 MPa, ensuring safe pressure resistance.
Is HP295 gas cylinder steel suitable for deep drawing applications?
Yes, HP295 gas cylinder steel offers excellent deep drawing performance with low cracking risk.
How stable are HP295 gas cylinder steel mechanical properties across batches?
GNEE ensures stable HP295 gas cylinder steel performance through strict process control and batch management.
Can HP295 gas cylinder steel be used for spinning and neck forming?
Yes, HP295 gas cylinder steel performs well in spinning processes with consistent deformation.
What is the elongation of HP295 gas cylinder steel?
HP295 gas cylinder steel typically has elongation ≥26%, ensuring good ductility.
