GB/T 6653-2017 Certified | Steel for Welded Gas Cylinders
HP295 Steel Plates & Strips for Welded Gas Cylinders
Lower yield strength ≥295MPa, excellent weldability, cold formability and pressure resistance, widely used for high-pressure LPG cylinders, industrial gas cylinders and pressure vessels. CEHE Steel supplies global customers with complete certification and customized processing.
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📖 Grade Explanation | HP Series Naming Rules
🔍 The steel grade consists of the first letters "HP" from the Chinese Pinyin of "Welded Cylinder" and the lower yield strength minimum value.
Example: HP295 → "HP" stands for welded gas cylinder steel; "295" represents the minimum lower yield strength of 295 MPa.
✅ This standard includes grades HP235, HP265, HP295, HP325, HP345. HP295 is a high-strength grade with excellent pressure resistance, widely used for high-pressure welded gas cylinders.
※ According to GB/T 6653-2017 standard, chemical composition and mechanical properties strictly comply with Table 1 and Table 2.
🏭 Domestic Grade Comparison | HP265 / HP295 / HP325
HP295 equivalent domestic grades and performance comparison:
HP265
GB/T 6653-2017
- C ≤0.18%
- YS ≥265MPa
- TS 410~560MPa
- Medium strength, general purpose
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HP295
GB/T 6653-2017
- C ≤0.20%
- YS ≥295MPa
- TS 440~590MPa
- High strength, pressure vessels
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HP325
GB/T 6653-2017
- C ≤0.20%
- YS ≥325MPa
- TS 460~610MPa
- Ultra-high pressure cylinders
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📌 HP295 equivalent domestic grades: HP265, HP325 | International equivalent grade: P295NB (EN 10120)
🌍 International Grade Comparison | HP295 vs P295NB
Chemical composition comparison between HP295 (GB/T 6653) and P295NB (EN 10120):
HP295
GB/T 6653-2017 (China)
- C ≤0.20%
- Si ≤0.10%*
- Mn ≤0.90%
- P ≤0.025%, S ≤0.012%
- Alt ≥0.015%
- Nb+V ≤0.12%
YS ≥295MPa, 100% equivalent to P295NB
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P295NB
EN 10120 (EU)
- C ≤0.20%
- Si ≤0.40%
- Mn ≤1.00%
- P ≤0.025%, S ≤0.015%
- Total Al ≥0.020%
- Nb+Ti ≤0.05%
YS ≥295MPa, European standard pressure vessel steel
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📌 HP295 and P295NB are fully equivalent in yield strength and performance, can be mutually substituted for global projects.
🔧 Customizable Services
Full flexible production to meet gas cylinder and pressure vessel requirements:
- ✓ Custom dimensional tolerances (GB/T 708, GB/T 709)
- ✓ Delivery: Oiled / Pickled / Black / Bright surface
- ✓ Slitting, cut-to-length, flat steel processing
- ✓ Ultrasonic testing (UT) for thick plates
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- ✓ Yield ratio control ≤0.80 upon request
- ✓ -40°C low-temperature impact test available
- ✓ Strict non-metallic inclusion control
- ✓ Small trial orders, lead time 35~45 days
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📏 Available Dimensions
🔥 Hot Rolled Plates/Strips
Thickness: 2.0~14.0mm
Width: 800~2000mm |
❄️ Cold Rolled Plates/Strips
Thickness: 1.5~4.0mm
Width: 800~1800mm
Annealed condition |
✂️ Tolerance Standards
GB/T 709 (Hot Rolled)
GB/T 708 (Cold Rolled) |
🎯 Special Dimensions
Length ≤12m custom cut
Slit width ≥50mm |
※ Coil ID 508/610mm, export standard packing. Regular stock: 2.5/3.0/4.0/5.0/6.0/8.0/10.0mm.
🧪 Chemical Composition (Ladle Analysis, %)
| Grade |
C |
Si |
Mn |
P≤ |
S≤ |
Nb≤ |
V≤ |
Ti≤ |
Nb+V≤ |
Alt≥ |
| HP295 |
≤0.20 |
≤0.10* |
≤0.90 |
0.025 |
0.012 |
0.05 |
0.10 |
0.06 |
0.12 |
0.015 |
| *For thickness ≥6mm, Si ≤0.35%; Residual elements Cr, Ni, Mo ≤0.30%, Cu ≤0.20%. |
⚙️ Mechanical Properties & Process Performance
| Grade |
Lower Yield Strength (MPa) ≥ |
Tensile Strength (MPa) |
A(L₀=80mm)% ≥ |
A(L₀=50mm)% ≥ |
180° Bend Test |
| HP295 |
295 |
440~590 |
19 |
25 |
D=2a |
❄️ Charpy V-Notch Impact Properties
| Grade |
Specimen Size (mm) |
Room Temperature KV₂ (J) ≥ |
-40°C Impact (Optional) |
| HP295 |
10×5×55 (t≥6mm) |
34 |
24 (upon request) |
Impact average of three specimens meets standard; one value allowed ≥70% of required. Transverse specimens for tensile & bending.
🏭 Application Areas
High-Pressure LPG Cylinders Industrial Gas Cylinders Fire Extinguisher Shells Pressure Vessels CNG Storage Tanks Refrigerant Gas Cylinders
HP295 steel offers high strength and excellent pressure resistance, fully meeting GB/T 6653 and EN 10120 requirements, ideal for high-pressure welded gas cylinders for global markets.
❓ Frequently Asked Questions (FAQ)
1. What are the equivalent grades of HP295?
Domestic: HP265, HP325 | International: P295NB (EN 10120). Fully interchangeable.
2. What is the yield strength of HP295?
Lower yield strength ≥295MPa, tensile strength 440~590MPa, suitable for high-pressure gas cylinders.
3. Minimum order quantity and delivery time?
MOQ: 20 tons, trial order ≥5 tons. Normal production lead time: 35~45 days.
4. Can you provide international certification?
Yes, we provide EN 10204 3.1 MTC, SGS/BV inspection report and GB/T 6653 certification.
📩 Get a Quote / Custom Inquiry
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