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P310NB Steel Sheet and Strip for Welded Gas Cylinders

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EN 10120 P310NB is a medium-strength, high-toughness, and excellently weldable specialized steel plate and strip for welded gas cylinders, making it an ideal material for manufacturing various types of welded cylinders with extremely high safety requireme

Standard :
EN 10120
Grade :
P310NB
Thickness :
2.0 - 14.0 mm
Width :
1100.0 - 1500.0 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

EN 10120 P310NB is a carbon/low-alloy steel designated for welded gas cylinders under the European Standard (EN) system. It is primarily used as a structural material for cylinders in medium-pressure gas storage and transport. P310NB steel sheet and strip is widely applied in the industrial weled gas cylinder manufacturing sector due to its balanced overall performance and excellent weldability.

Grade	P310NB
Standard	EN 10120: European Standard - Steel sheet and strip for welded gas cylinders
Delivery Conditions	Hot rolled and normalized
Surface Quality	Free from defects such as oxidation scale, cracks, inclusions, etc.
Weldability	Good weldability, control the heat input.
Machinability	Excellent cold working plasticity
Quality Control	Material certificate Non-destructive testing (such as UT) can be added as required.

Chemical Composition

Grade	P310NB
Element	C	Si	Mn	P	S	Al (Total)	N	Nb	Ti
Content (%)	≤ 0.20	≤ 0.50	≥ 0.70	≤ 0.025	≤ 0.015	≥ 0.020	≤ 0.009	≤ 0.050	≤ 0.030

Carbon Equivalent of P310NB Steel Sheet and Strip for Welded Gas Cylinders: CEV ≤ 0.41%

Carbon equivalent (CEV) is calculated using the International Institute of Welding (IIW) formula:

CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

Mechanical Properties

Grade	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV) [min]
P310NB	310	460 - 550	21 (t < 3 mm) 28 (3 ≤ t ≤ 5 mm)	27J (at 0°C)

Applications

P310NB steel plates and strips are specifically designed for the manufacture of refillable welded steel gas cylinders and are widely used in:

1. Industrial gas cylinders: storing oxygen, nitrogen, argon, carbon dioxide, etc.

2. Medical gas cylinders: storing medical oxygen, nitrous oxide, etc.

3. Fire extinguisher bodies.

4. High-pressure air cylinders (e.g., for diving respirators, firefighting breathing apparatus).

5. Compressed natural gas (CNG) cylinders for vehicles.

Other Information

International Equivalent Materials

Grade	Standard	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]
P310NB	EN 10120	310	460 - 550	21 (t < 3 mm) 28 (3 ≤ t ≤ 5 mm)
HP325	GB/T 6653	325	490-600	18 (t < 3 mm) 22 (3 ≤ t ≤ 5 mm)
SG325	JIS G 3116	325	490(min)	22

* Equivalent materials are only approximations, mechanical properties and chemical composition must be compared during application design.

P310NB Steel Sheet and Strip for Welded Gas Cylinders is not suitable for the following scenarios:

1. High-pressure cylinders (design pressure > 30 MPa): Requires higher strength grades (such as P355NB, P460NB) or seamless cylinder steels;

2. Corrosive media: Such as chlorine, ammonia, acidic gases, etc. (Stainless steel or corrosion-resistant alloys must be used);

3. Low-temperature environments (< -20°C): Conventional P310NB impact energy only meets the requirement for 0°C. For low-temperature applications, specialized low-temperature cylinder steels (such as EN 10028-4 P355NL1) must be used.