GB/T 6653-2017 Certified | Steel for Welded Gas Cylinders
HP265 Steel Plates & Strips for Welded Gas Cylinders
Lower yield strength ≥265MPa, excellent weldability, cold formability and low-temperature toughness, widely used for medium-pressure LPG cylinders, fire extinguishers, 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: HP265 → "HP" stands for welded gas cylinder steel; "265" represents the minimum lower yield strength of 265 MPa.
✅ This standard includes grades HP235, HP265, HP295, HP325, HP345. HP265 is a medium-strength grade with balanced strength and formability, widely used for conventional and medium-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 | HP235 / HP265 / HP295
Comparison of chemical composition and properties among main Chinese welded gas cylinder steel grades:
HP235
GB/T 6653-2017
- C ≤0.16%
- Si ≤0.10%*
- Mn ≤0.80%
- P ≤0.025%, S ≤0.012%
- YS ≥235MPa
- TS 380~520MPa
- A80 ≥23%, easy forming
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HP265
GB/T 6653-2017
- C ≤0.18%
- Si ≤0.10%*
- Mn ≤0.85%
- P ≤0.025%, S ≤0.012%
- YS ≥265MPa
- TS 410~560MPa
- A80 ≥21%, balanced performance
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HP295
GB/T 6653-2017
- C ≤0.20%
- Si ≤0.10%*
- Mn ≤0.90%
- P ≤0.025%, S ≤0.012%
- YS ≥295MPa
- TS 440~590MPa
- A80 ≥19%, high strength
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📌 Note: For thickness ≥6mm, Si ≤0.35% for all grades. HP265 is the most widely used grade for general medium-pressure gas cylinders.
🌍 International Grade Comparison | HP265 vs P265NB
Chemical composition comparison between HP265 (GB/T 6653) and P265NB (EN 10120):
HP265
GB/T 6653-2017 (China)
- C ≤0.18%
- Si ≤0.10%*
- Mn ≤0.85%
- P ≤0.025%, S ≤0.012%
- Alt ≥0.015%
- Nb+V ≤0.12%
YS ≥265MPa, close to P265NB, can be mutually substituted
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P265NB
EN 10120 (EU)
- C ≤0.18%
- Si ≤0.40%
- Mn ≤1.00%
- P ≤0.025%, S ≤0.015%
- Total Al ≥0.020%
- Nb+Ti ≤0.05%
YS ≥265MPa, European standard pressure vessel steel
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📌 Note: HP265 and P265NB are equivalent in yield strength. HP265 has stricter S content control and can replace P265NB for European market 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≥ |
| HP265 |
≤0.18 |
≤0.10* |
≤0.85 |
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 |
| HP265 |
265 |
410~560 |
21 |
27 |
D=1.5a |
❄️ Charpy V-Notch Impact Properties
| Grade |
Specimen Size (mm) |
Room Temperature KV₂ (J) ≥ |
-40°C Impact (Optional) |
| HP265 |
10×5×55 (t≥6mm) |
27 |
20 (upon request) |
Impact average of three specimens meets standard; one value allowed ≥70% of required. Transverse specimens for tensile & bending.
🏭 Application Areas
LPG Welded Cylinders Medium-Pressure Gas Cylinders Fire Extinguisher Shells Refrigerant Gas Tanks Industrial Pressure Vessels CNG Storage Cylinders
HP265 steel offers balanced strength and formability, fully meeting GB/T 6653 and EN 10120 requirements, ideal for refillable & non-refillable welded gas cylinders for global markets.
❓ Frequently Asked Questions (FAQ)
1. Can HP265 replace P265NB for European projects?
Yes. HP265 has equivalent yield strength and stricter impurity control, fully qualified to replace P265NB (EN 10120).
2. What is the difference between HP265, HP235 and HP295?
HP235: low strength, easy forming; HP265: medium strength, general purpose; HP295: high strength for pressure vessels. All follow GB/T 6653.
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 EN 10204 3.1 MTC?
Yes, we provide official mill test certificate and accept SGS/BV inspection before shipment.
📩 Get a Quote / Custom Inquiry
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