HP345 gas cylinder steel plate is a high-strength hot-rolled carbon structural steel specially developed for welded gas cylinders and pressure vessels.
HP345 gas cylinder steel plate
Compared with conventional HP295 steel, HP345 offers higher yield strength, better load-bearing capacity, and enhanced safety performance, making it ideal for medium and high-pressure gas storage applications.
Advantages of HP345 Steel Plate
HP345 steel plate stands out due to its balanced performance in strength, weldability, and processing efficiency.
| Advantage | Description |
|---|---|
| High Strength | Yield strength ≥345 MPa ensures strong pressure resistance |
| Excellent Weldability | Suitable for automatic welding and manual welding |
| Good Formability | Easy for stamping, rolling, and shaping into cylinders |
| Stable Quality | Uniform microstructure and consistent batch performance |
| Safety Compliance | Meets strict national and international cylinder standards |
These advantages make HP345 steel plate a preferred material for gas cylinder manufacturers requiring both safety and efficiency.
Mechanical Properties of HP345 Steel Plate
HP345 steel plate delivers reliable mechanical performance for pressure-bearing applications:
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥345 |
| Tensile Strength (MPa) | 510–620 |
| Elongation (<3mm) | ≥17% |
| Elongation (≥3mm) | ≥21% |
High tensile strength and elongation ensure the material can withstand internal pressure while maintaining structural integrity.
Chemical Composition of HP345 Steel Plate
The chemical composition is carefully controlled to ensure strength, toughness, and weldability:
| Element | C | Si | Mn | P | S | Al |
|---|---|---|---|---|---|---|
| Content (%) | 0.20 | 0.35 | 1.50 | 0.025 | 0.015 | ≥0.015 |
Standards and Equivalent Grades
| Category | Details |
|---|---|
| Main Standard | GB/T 6653 |
| Size Tolerance | GB/T 709 |
| Equivalent Grades | JIS G3116 SG345 / EN E355 / ASTM similar grades |
HP345 steel plate meets international standards, making it suitable for global projects and export markets.
Application Fields of HP345 Steel Plate
HP345 steel plate is widely used in various gas storage and pressure vessel applications:
| Application | Description |
|---|---|
| LPG Cylinders | Household and commercial gas storage |
| Industrial Gas Cylinders | Oxygen, nitrogen, argon, CO₂ cylinders |
| Medical Gas Cylinders | High safety requirement applications |
| Vehicle Gas Tanks | On-board high-pressure storage systems |
| Pressure Vessels | Small and medium welded pressure containers |
Its performance makes it ideal for medium and high-pressure environments requiring long-term reliability.
Delivery Condition & Surface Quality
| Item | Description |
|---|---|
| Delivery Condition | Hot rolled / Controlled rolling / Normalized |
| Surface Quality | Smooth, clean, free from cracks, inclusions, delamination |
| Processing Suitability | Direct welding, forming, and coating |
High surface quality ensures efficient downstream processing and reduces production defects.
Packaging for HP345 Steel Plate
| Item | Details |
|---|---|
| Packaging | Standard seaworthy export packing |
| Protection | Moisture-proof, rust-proof, shock-proof |
| Reinforcement | Steel strapping + wooden pallets |
| Customization | Available upon request |
Quality Assurance & Service
- 100% inspection before shipment
-
Full technical documentation and test reports
- Third-party inspection available (e.g., SGS)
- Professional after-sales and technical support
- Fast response for inquiries and quotations
Why Choose HP345 Steel Plate from GNEE?
GNEE Steel is a professional supplier integrating production, processing, and global logistics, specializing in pressure vessel steel.
- Years of experience in gas cylinder steel supply
- Stable quality compliant with GB/T 6653
- Large production capacity and fast delivery
- One-stop solution from material to processing support
HP345 gas cylinder steel plate combines high strength, excellent weldability, and reliable performance, making it a key material for modern gas storage and pressure vessel manufacturing. Its ability to meet strict safety standards while maintaining cost efficiency makes it highly competitive in global markets.
Looking for a reliable supplier of HP345 gas cylinder steel plate? Send us your requirements (thickness, width, quantity, destination port), and GNEE Steel will provide a competitive quotation, fast delivery, and full technical support within 8 hours.
Contact now to get HP345 Steel Plate Quote
Does HP345 gas cylinder steel support third-party inspection?
Absolutely. GNEE supplies HP345 gas cylinder steel with full traceability and supports inspections from globally recognized agencies to meet project and tender requirements.
What is the difference between HP345 gas cylinder steel and HP295?
Compared to HP295, HP345 gas cylinder steel offers higher strength and better pressure resistance, making it more suitable for demanding applications and reducing material thickness requirements.
How does GNEE ensure the quality of HP345 gas cylinder steel?
GNEE implements strict quality control from raw materials to final inspection, including ultrasonic testing and mechanical property verification for HP345 gas cylinder steel.
Is HP345 gas cylinder steel suitable for export projects?
Yes, HP345 gas cylinder steel from GNEE is widely exported and meets international project requirements in regions such as the Middle East, Southeast Asia, and South America.
What should be considered when selecting HP345 steel?
When choosing HP345 steel, consider cylinder pressure rating, wall thickness, welding method, and environmental exposure. While HP345 provides superior strength, proper fabrication, inspection, and handling are crucial to fully leverage its mechanical and safety advantages.
What should be considered when selecting HP345 steel?
When choosing HP345 steel, consider cylinder pressure rating, wall thickness, welding method, and environmental exposure. While HP345 provides superior strength, proper fabrication, inspection, and handling are crucial to fully leverage its mechanical and safety advantages.
What are the benefits of using HP345 steel for gas cylinders?
Using HP345 steel ensures enhanced safety, long-term durability, and compliance with GB/T 6653 standards. Its high strength allows for thinner walls while maintaining pressure resistance, which reduces material cost and weight without compromising safety. It also provides consistent performance in industrial and outdoor environments.
What is HP345 steel plate?
HP345 steel plate is a high-performance steel specifically designed for manufacturing welded pressure vessels, including LPG and industrial gas cylinders. It complies with the GB/T 6653 standard and offers a balanced combination of strength, ductility, and weldability, making it ideal for safe and durable cylinder production.