EN 10120 P265NB Steel for Gas Cylinders
EN 10120 P265NB Steel for Gas Cylinders - Normalized Pressure Vessel Grade
Comprehensive datasheet for EN 10120 P265NB steel coil used in welded gas cylinders. Includes chemical composition, mechanical and physical properties, international equivalents, and application guide.
Cold forming, hot forming, deep drawing, welding, punching
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EN 10120 P265NB Steel for Gas Cylinders Introduction
EN 10120 P265NB is a normalized fine-grain steel specifically developed for welded gas cylinders. It is supplied in hot-rolled coil form and offers excellent cold forming properties, reliable weldability, and consistent mechanical strength. The grade is designed to safely contain pressurized gases under repeated loading, with guaranteed impact toughness down to -20 °C. Controlled aluminium content ensures fine austenitic grain size, improving ductility and ageing resistance.
- Minimum yield strength of 265 MPa for thickness ≤ 16 mm
- Tensile strength range 410–530 MPa
- Typical applications: LPG, industrial gas, and CNG cylinders
EN 10120 P265NB Steel for Gas Cylinders Chemical Composition
The composition is tightly controlled to ensure good formability and toughness. Aluminium is added as a grain refiner, while phosphorus and sulfur are kept low for ductility and weld quality. Niobium may be present as a microalloying element for strength.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.20 | Carbon maximum |
| Si | ≤ 0.40 | Silicon maximum |
| Mn | 0.50 – 1.40 | Manganese |
| P | ≤ 0.025 | Phosphorus maximum |
| S | ≤ 0.015 | Sulfur maximum |
| Altotal | ≥ 0.020 | Aluminium, fine grain practice |
| N | ≤ 0.012 | Nitrogen maximum |
| Nb | ≤ 0.05 | Optional microalloying; not always present |
| Other | Cr+Cu+Ni+Mo ≤ 0.40 each | Residual elements |
EN 10120 P265NB Steel for Gas Cylinders Thermal and Electrical Physical Properties
These physical properties are typical for normalized carbon-manganese steels and can be used for calculation of thermal expansion, heat transfer, and electromagnetic behavior. They are not mandatory in EN 10120 but are essential for design and simulation.
| Property | Typical Value | Unit | Conditions / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic modulus (E) | 210 | GPa | 20 °C |
| Shear modulus (G) | ~81 | GPa | Calculated (E, ν) |
| Poisson ratio (ν) | 0.30 | - | At ambient temperature |
| Thermal expansion coefficient (α) | 11.5 | 10⁻⁶/K | 20 – 100 °C |
| Thermal conductivity (λ) | 50 | W/(m·K) | At 20 °C |
| Specific heat capacity (c) | 460 | J/(kg·K) | Between 20–100 °C |
| Electrical resistivity (ρe) | 0.22 | 10⁻⁶ Ω·m | Room temperature |
EN 10120 P265NB Steel for Gas Cylinders Mechanical Properties
The mechanical properties are guaranteed for the normalized condition. Values vary with product thickness. Impact test is performed on transverse specimens at -20 °C with a minimum average energy of 27 J.
Bend test: 180° mandrel diameter depending on thickness.
| Property | Standard Requirement | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield strength (ReH) | ≥ 265 | MPa | t ≤ 16 mm |
| Yield strength (ReH) | ≥ 255 | MPa | 16 < t ≤ 40 mm |
| Tensile strength (Rm) | 410 – 530 | MPa | t ≤ 40 mm |
| Elongation (A) | ≥ 22 | % | t ≤ 16 mm, L₀=5.65√S₀ |
| Elongation (A) | ≥ 21 | % | 16 < t ≤ 40 mm |
| Bend test (180°) | d = 2a | - | t ≤ 16 mm |
| Bend test (180°) | d = 3a | - | 16 < t ≤ 40 mm |
| Impact energy (KV₂) | ≥ 27 (min. single 19) | J | Transverse, -20 °C, 10×10 mm specimen |
EN 10120 P265NB Steel for Gas Cylinders Equivalent Standards and Direct Substitute Grades
| Region / Country | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10120 | P265NB | Original specification |
| International | ISO 4978 | P265NB | Technically identical |
| China | GB 6653 | HP265 | Equivalent gas cylinder steel |
| Germany (deprecated) | DIN EN 10120 | P265NB | Former national adoption, now superseded by EN |
EN 10120 P265NB Steel for Gas Cylinders Application Introduction
EN 10120 P265NB is optimized for gas cylinder manufacturing. The alloy design provides a fine-grain structure that enhances safety under cyclic pressure and low-temperature service. It is normally delivered as slit strip or cut-to-length sheet from coil, ready for deep drawing, cold stamping, or roll forming into cylinder shells and heads.
Product Applications: Welded LPG cylinders (domestic and commercial), High-pressure seamless or welded CNG tanks, Industrial gas cylinders for oxygen, argon, nitrogen, CO₂, Acetylene gas cylinders, Fire extinguisher bodies (portable and wheeled), Pressure accumulator bottles
Processed into products: Cylinder shell (body) – deep drawn or rolled & welded, Upper and lower heads (dished ends) – pressed from circular blanks, Valve boss and neck ring, Foot ring and shroud, Support brackets and mounting lugs
Application industries: Gas cylinder manufacturing (LPG, CNG, oxygen, nitrogen, acetylene, medical gases), Pressure vessel fabrication, Automotive fuel storage (compressed hydrogen, natural gas), Industrial gas bottling and distribution, Fire extinguisher and accumulator production
EN 10120 P265NB Steel for Gas Cylinders Similar and Alternative Materials
| Region / Country | Standard | Grade | Remarks |
|---|---|---|---|
| EU | EN 10120 | P245NB | Lower strength (min. YS 245 MPa) same application |
| EU | EN 10120 | P310NB | Higher strength (min. YS 310 MPa) same application |
| International | ISO 4978 | P245NB | Same as EN P245NB |
| Japan | JIS G 3116 | SG295 | For gas cylinders, YS ≥ 295 MPa, different chemical concept |
| USA | ASTM A414 / A414M | Grade G | Light-gauge pressure vessel steel, YS 240 MPa, not specifically for gas cylinders |
Notes:
- Forming: The material is intended for cold working; if hot forming is used, re-normalization may be required to restore properties.
- Weldability: Excellent for MIG/MAG, TIG, resistance and submerged arc welding; preheating not normally required.
- Surface condition: Usually supplied as-pickled and oiled or dry; can also be blast-cleaned.
- Certification: EN 10204 type 3.1 or 3.2 inspection documents are standard for cylinder applications.
- Pressure Equipment Directive (PED): P265NB meets the essential safety requirements for pressure vessel materials under 2014/68/EU.
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