HP345 steel plate is a high-strength, low-alloy steel designed for welded gas cylinders and pressure-bearing vessels.
HP345 steel plate
It is widely used for industrial gas cylinders, LPG cylinders, dissolved acetylene cylinders, and other small pressure vessels, providing a balance of strength, toughness, and cost-effectiveness.
Mechanical Properties of HP345 steel plate
HP345 steel plate offers excellent comprehensive mechanical properties, ensuring safety and reliability of gas cylinders during filling, storage, and transport.
| Property | Specification |
|---|---|
| Yield Strength (MPa) | ≥345 |
| Tensile Strength (MPa) | 480–620 |
| Elongation % (t<3mm) | ≥17 |
| Elongation % (3mm ≤ t ≤ 25.4mm) | ≥21 |
| Charpy Impact Energy (KV2) at 20°C | ≥34 J |
High yield and tensile strength ensures resistance to internal pressure. Adequate elongation and impact toughness protect cylinders from deformation, cracking, and external impacts.
Chemical Composition of HP345 steel plate
HP345 steel plate complies with GB 6653-2017 Steel Plates and Strips for Welded Gas Cylinders. The chemical elements are strictly controlled to achieve strength, toughness, and weldability.
| Element | C max | Mn | Si max | P max | S max | Notes |
|---|---|---|---|---|---|---|
| HP345 Steel Plate | 0.20 | 0.60–1.20 | 0.35 | 0.025 | 0.025 | Balanced composition for weldability and toughness |
Process Performance of HP345 steel plate
HP345 steel plate is highly formable and weldable, suitable for cylinder production:
| Feature | Description |
|---|---|
| Cold Forming | Can be stamped and rolled into cylinder bodies, heads, and nozzles without cracks or wrinkles |
| Weldability | Compatible with manual arc welding and gas-shielded welding; welds have high strength and reliability |
| Corrosion Resistance | Maintains stable performance in normal service environments; surface treatment may be required for harsh conditions |
The steel plate's excellent cold-forming performance ensures high manufacturing efficiency, while weldability and toughness guarantee safe, durable gas cylinders.
Application Fields of HP345 steel plate
| Application Type | Typical Uses | Key Requirements |
|---|---|---|
| Industrial Gas Cylinders | Oxygen, nitrogen, argon, carbon dioxide cylinders | Strength, low-temperature toughness, reliability |
| Liquefied Petroleum Gas (LPG) Cylinders | Household and commercial LPG storage | Pressure resistance, corrosion resistance, formability |
| Dissolved Acetylene Cylinders | Gas for welding and cutting | Impact toughness, safety under high pressure |
| Other Pressure Vessels | Small air compressor tanks, reaction kettles | Moderate pressure-bearing capacity, corrosion resistance |
HP345 steel plate is ideal for moderate-pressure gas cylinders, balancing safety, performance, and cost.
Differences from Other Gas Cylinder Steels
| Steel Grade | Yield Strength (MPa) | Typical Application |
|---|---|---|
| HP295 | ≥295 | Low-pressure cylinders, cost-sensitive applications |
| HP345 | ≥345 | Moderate-pressure cylinders, balance of performance and cost |
| HP365 | ≥365 | High-pressure cylinders, heavy-duty applications |
HP345 provides a mid-range solution, suitable for most conventional gas cylinders, while HP295 or HP365 may be selected for specific pressure requirements.
HP345 steel plate is a reliable, high-performance material for gas cylinder manufacturing. Its combination of mechanical strength, processability, and compliance with national standards ensures safety, durability, and cost-effectiveness.
Proper handling, processing, and inspection are critical to maintaining these properties during cylinder production.
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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.