HP345 steel plate is a high-performance material designed specifically for welded gas cylinder applications.
HP345 steel plate
With superior strength, excellent low-temperature toughness, and precision manufacturing, HP345 is widely used in LPG cylinders, industrial gas tanks, and pressure vessels.
Gnee offers ready stock of HP345 steel plates and coils in China, ensuring fast delivery and reliable supply for your projects.
Product Specifications of HP345 steel plate
| Specification | Range / Details |
|---|---|
| Thickness | 1.6mm – 12mm |
| Width | 800mm – 1630mm |
| Length | 3000mm – 18000mm or Coils |
| Steel Standard | GB/T 6653 |
| Heat Treatment | Normalized / Quenched & Tempered / Tempered / TMCP + Tempered |
| Rolling Type | Welded Gas Cylinder Steel Plates and Coils |
Gnee maintains tens of thousands of tons in stock, ready to meet large-scale orders for HP345 steel plates and coils used in LNP cylinders and other gas storage solutions.
Key Advantages of HP345 steel plate
- High Strength: Yield strength ≥345 MPa and tensile strength 510–620 MPa ensures structural integrity under pressure.
- Excellent Low-Temperature Performance: Maintains toughness in extreme cold, minimizing risk of cracking.
- Versatile Heat Treatments: Supports normalized, quenched & tempered, and TMCP processes for optimal performance.
- Customizable Services: Shot blasting, painting, cutting, and welding can be tailored to project requirements.
- Certified Quality: Original Mill Test Certificate issued under EN 10204 3.1 / 3.2 standards.
Mechanical Properties of HP345 steel plate
| Property | Thickness <3mm | Thickness ≥3mm |
|---|---|---|
| Yield Strength (MPa) | 345 | 345 |
| Tensile Strength (MPa) | 510–620 | 510–620 |
| Elongation (%) | 17 | 21 |
These properties ensure HP345 steel plates provide reliable performance for welded gas cylinders, meeting strict safety and engineering standards.
Chemical Composition (Max %) of HP345 steel plate
| Element | C | Si | Mn | P | S | Al |
|---|---|---|---|---|---|---|
| Max % | 0.20 | 0.35 | 1.50 | 0.025 | 0.015 | ≥0.015 |
The optimized chemical composition ensures high corrosion resistance, toughness, and weldability, making HP345 steel ideal for pressure vessels exposed to varying environmental conditions.
Applications of HP345 steel plate
HP345 welded gas cylinder steel plates are primarily used in:
- LPG Cylinders – Domestic and industrial gas storage.
- Industrial Gas Storage Tanks – Withstanding high pressure and low temperatures.
- Pressure Vessels and Cylinders – Reliable and durable under operational stresses.
Gnee's HP345 steel plates have been widely adopted in gas cylinder production due to their consistent quality and compliance with GB/T 6653 standards.
Why Choose Gnee HP345 Steel Plates?
Extensive Stock: Immediate availability of large volumes.
Quality Assurance: Certified testing, low-temperature impact tests, and strict mechanical verification.
Custom Services: Processing according to end-user needs, including cutting, welding, and painting.
Expert Support: Technical guidance for cylinder manufacturers ensures optimal material selection and performance.
Contact Gnee today to request a quote for HP345 welded gas cylinder steel plates or coils, and ensure your gas storage project meets the highest safety and durability standards.
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What are the main mechanical properties of HP345 steel?
HP345 steel features a minimum yield strength of 345 MPa and a tensile strength typically ranging from 470 to 600 MPa, depending on thickness. It has excellent elongation and impact resistance, which ensures reliability under high-pressure conditions, while maintaining sufficient ductility for forming and welding processes.
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.
Is HP345 steel plate weldable?
Yes, HP345 steel has excellent weldability, compatible with common welding methods such as SMAW, MIG, and TIG. Preheating is recommended for thicker plates to prevent cracking, and proper post-weld heat treatment can help maintain mechanical integrity and long-term performance.
Can HP345 steel be formed and machined easily?
HP345 steel exhibits good formability and moderate machinability. It can be cold-rolled or hot-formed into complex cylinder shapes, although slower cutting speeds and sharp tools are recommended for machining due to its high strength. Proper tooling and handling ensure minimal surface defects and high-quality fabrication.
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