HP295 and 34CrMo4 serve different cylinder manufacturing needs: HP295 is a low-carbon steel designed for welded, low-pressure LPG cylinders due to its excellent formability and low cost, while 34CrMo4 is a chromium-molybdenum alloy steel used for high-pressure seamless cylinders (e.g., CNG) requiring high strength and fatigue resistance.
As an experienced gas cylinder steel manufacturer,GNEE supplies HP295 and 34CrMo4 steel plates and coils with strict quality control, helping global buyers choose the right material for their projects.
Key Comparison Table
HP295 (Welded Cylinders)
• Best For: Household LPG, low-pressure applications.
• Properties: Excellent welding performance, high elongation, easy stamping.
• Manufacturing: Usually made from hot-rolled steel plates formed into two end caps and a cylinder body, then welded.
34CrMo4 (Seamless/High-Pressure Cylinders)
• Best For: CNG storage, high-pressure industrial gas cylinders.
• Properties: High strength-to-weight ratio, high yield strength (often treated via quenching and tempering).
• Manufacturing: Typically processed as seamless steel pipe, often drawn from a single billet.
| Feature | HP295 | 34CrMo4 |
|---|---|---|
| Material Type | Low Carbon Steel Plate | Cr-Mo Alloy Steel |
| Cylinder Type | Welded (LPG) | Seamless |
| Strength | Moderate | High |
| Forming Ability | Excellent (Stamping) | Requires heat treatment |
| Typical Use | Cooking gas bottles | CNG Vehicle Tanks |
Chemical Composition Comparison
| Element | HP295 (wt%) | 34CrMo4 (wt%) |
|---|---|---|
| C | ≤0.20 | 0.30–0.37 |
| Si | ≤0.35 | 0.10–0.40 |
| Mn | ≤1.00 | 0.60–0.90 |
| P | ≤0.035 | ≤0.035 |
| S | ≤0.035 | ≤0.035 |
| Cr | - | 0.90–1.20 |
| Mo | - | 0.15–0.30 |
| Als | ≥0.015 | - |
Mechanical Properties Comparison
| Property | HP295 | 34CrMo4 (Quenched & Tempered) |
|---|---|---|
| Yield Strength | ≥295 MPa | ≥835 MPa |
| Tensile Strength | 440–560 MPa | 985–1150 MPa |
| Elongation | ≥26% | ≥12% |
| Charpy Impact | ≥27 J at room temp | ≥63 J at room temp |
| Yield Ratio | ≤0.80 | High, stable |
| Hardness | Low | HB 229–269 |
HP295 prioritizes ductility + formability
34CrMo4 prioritizes ultra-high strength + fatigue resistance
Manufacturing Process Comparison：HP295 vs 34CrMo4
HP295 (Welded Cylinders)
Produced via deep drawing + welding
Excellent cold-forming capability
Lower processing complexity
Suitable for mass production
34CrMo4 (Seamless Cylinders)
Manufactured by hot drawing + flow forming
Requires heat treatment (quenching & tempering)
More complex and higher cost process
Produces seamless structure → higher safety margin
Performance in High-Pressure Applications
HP295
✔ Suitable for medium-pressure cylinders
✔ Good resistance to deformation
✔ Stable performance in LPG and industrial gases
✔ Better for static storage conditions
Performance In High-Pressure Applications
34CrMo4
✔ Designed for very high pressure (>20 MPa) applications
✔ Excellent anti-burst capability
✔ Superior fatigue resistance under cyclic loading
✔ Ideal for dynamic environments (vehicles, hydrogen storage)
HP295 Vs 34CrMo4：Which one is more suitable
Weldability vs Heat Treatment
| Factor | HP295 | 34CrMo4 |
|---|---|---|
| Weldability | Excellent | Limited (requires strict control) |
| Heat Treatment | Not required | Mandatory (quenching & tempering) |
| Production Efficiency | High | Lower |
HP295 is much easier to process industrially, while 34CrMo4 requires stricter metallurgical control.
Cost Comparison
| Aspect | HP295 | 34CrMo4 |
|---|---|---|
| Raw Material Cost | Lower | Higher (alloyed with Cr, Mo) |
| Processing Cost | Low | High (heat treatment + seamless forming) |
| Total Cost | Cost-effective | Premium material |
Advantages & Limitations Summary of HP295 and 34CrMo4 steel
HP295 Advantages
Excellent formability (ideal for deep drawing)
Easy welding → lower defect risk
Cost-effective for mass production
Stable and reliable for medium pressure
HP295 Limitations
Lower strength → thicker walls needed
Not suitable for ultra-high pressure
34CrMo4 Advantages
Extremely high strength and pressure resistance
Superior fatigue life and durability
Seamless structure improves safety
Better performance in extreme conditions
34CrMo4 Limitations
Higher cost
Complex manufacturing process
Requires strict heat treatment control
| Aspect | HP295 | 34CrMo4 |
|---|---|---|
| Material Cost | Low, widely available carbon steel | High, alloy steel + heat treatment |
| Processing Cost | Low, simple welding & forming | High, seamless rolling + quenching/tempering |
| Supply Stability | Extremely stable | Stable but more expensive |
| Suitable For | Mass-produced low-cost cylinders | High-pressure high-value cylinders |
How to Choose HP295 and 34CrMo4 steel?
Choose HP295 if:
You need cost-efficient mass production
Pressure is moderate (LPG, LN2, industrial gas)
Welding and forming efficiency are priorities
Choose 34CrMo4 if:
You need high-pressure (>20 MPa) performance
Safety margin is critical (vehicle, hydrogen)
Long fatigue life is required
Why Choose GNEE as Your Supplier?
18+ years manufacturing experience
Full certification support (EN, JIS, GB standards)
Custom sizes, thickness, and surface treatment
Fast delivery and global logistics
Strict quality inspection (chemical + mechanical testing)
We don't just sell steel-we provide complete gas cylinder material solutions.
Contact now to get the request free sample & technical support
What is the equivalent material of 34CrMo4?
34CrMo4 Equivalent Material: DIN 10083 Alloy Steel
What is 34Cr4 material?
30H, 34Cr4, 1.7033 - Alloy steel
Structural steel designed for heat improvement with low hardness and high ductility, easy for thermo-mechanical treatment, which achieves the best mechanical properties in the dimensions of 30-45mm, depending on the heat treatment method (hardening in oil/water).
Can 34CrMo4 be used for LPG welded cylinders?
Technically possible but not economical.34CrMo4 is over-strength, expensive, and harder to weld for general LPG cylinders. HP295 is the standard choice.
Which one has better weldability?
HP295 has far better weldability.Its low carbon content allows direct welding without preheating.34CrMo4 requires preheating and post-weld heat treatment to avoid cracking.
Which material is better for deep drawing and forming?
HP295 is superior.It has high elongation (≥26%) and low yield ratio, making it ideal for stamping and forming cylinder shells.
