HP345 steel plate is a high-strength, low-alloy steel specifically developed for welded gas cylinders and high-pressure gas vessels.
HP345 steel plate
It is manufactured according to Q/BQB 329-2009 and is widely used in LPG, acetylene, propane, and other high-pressure gas storage applications, offering excellent strength, toughness, and corrosion resistance.
Chemical Composition of HP345 steel plate
The chemical composition of HP345 steel plate is optimized for high-pressure gas applications, ensuring reliability and safety.
| Element | C max | Si max | Mn max | P max | S max | Al min |
|---|---|---|---|---|---|---|
| HP345 Steel Plate | 0.20 | 0.35 | 1.00 | 0.025 | 0.015 | 0.020 |
Mechanical Properties of HP345 steel plate
HP345 steel plate provides the high tensile strength and low-temperature toughness required for safe gas cylinder operation.
| Property | Specification |
|---|---|
| Yield Strength (MPa) | ≥345 |
| Tensile Strength (MPa) | 510–620 |
| Elongation % (<3mm) | ≥17 |
| Elongation % (3–25.4mm) | ≥21 |
The combination of yield strength and elongation ensures the plates can withstand internal pressures without deformation.
Suitable for cylinders exposed to extreme temperatures and pressure variations.
Heat Treatment & Additional Conditions of HP345 steel plate
HP345 steel plate can be delivered with a range of heat treatments and optional inspections to meet customer requirements:
| Heat Treatment / Test | Description |
|---|---|
| Normalized (N) | Improves toughness and reduces internal stress |
| Quenched & Tempered (Q+T) | Increases strength and hardness |
| TMCP (Thermal Mechanical Control Process) | Optimizes grain structure for toughness |
| Ultrasonic Testing (UT) | Detects internal flaws |
| Z-Direction Test (Z15, Z25, Z35) | Ensures performance across thickness |
| Charpy V-Notch Impact Test | Verifies low-temperature toughness |
| Third-Party Test (e.g., SGS) | Quality verification |
| Surface Treatment | Shot blasting, coating, painting (optional) |
These options allow manufacturers to customize the steel plate for specific cylinder or vessel designs while ensuring compliance with international safety standards.
Applications of HP345 steel plate
HP345 steel plate is ideal for high-pressure gas storage, including:
| Application | Key Requirement |
|---|---|
| LPG Cylinders | High tensile strength, low-temperature toughness |
| Industrial Gas Vessels | Pressure resistance, corrosion resistance |
| High-Pressure Steel Containers | Structural integrity under heavy loads |
HP345 steel plate is widely used in LPG, acetylene, and propane cylinders, as well as industrial gas vessels, due to its strength, toughness, and certified quality.
We can supply:
| Feature | Details |
|---|---|
| Packaging | Standard seaworthy export packing or as requested |
| Delivery Time | 30–50 days (7 days for stock goods) |
| Loading Ports | Shanghai, Tianjin, Qingdao |
| Supply Capacity | 5,000 MT / month |
| Minimum Order Quantity | 1 piece |
Gnee maintains large stock availability, ensuring rapid delivery and reliable supply for large-scale projects.
Products Description
- High strength and toughness for safe gas cylinder and vessel operation.
-
Versatile heat treatment options for customized performance.
- Optional inspections and third-party testing for certified reliability.
- Custom surface treatments such as painting or coating.
- Compliance with Q/BQB 329-2009 standard.
Contact Gnee today to request HP345 steel plates for your gas cylinder or high-pressure vessel projects and ensure safety, durability, and compliance.
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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.