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P245NB Steel Sheet and Strip for Welded Gas Cylinders

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EN 10120 P245NB steel plates and strips exhibit good weldability, toughness, and cold formability, making them suitable for the manufacturing of medium and low-pressure welded gas cylinders under conventional service conditions.

Standard :
EN 10120
Grade :
P245NB
Thickness :
2.0 - 14.0 mm
Width :
1100.0 - 1500 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 P245NB is an economical, highly weldable steel specifically designed for medium to low-pressure gas cylinders. Its core advantages include low carbon content for easy welding and stable toughness, making it suitable for manufacturing welded gas cylinders under conventional working conditions. When selecting this steel, it is essential to focus on the mechanical properties corresponding to thickness, operating temperature (matching quality grade), and medium compatibility.

Grade	P245NB
Standard	EN 10120: European Standard - Steel sheet and strip for welded gas cylinders
Delivery Conditions	Normalized
Surface Quality	Free from surface defects such as cracks, inclusions, delaminations, 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	P245NB
Element	C	Si	Mn	P	S	Al (Total)	N	Nb	Ti
Content (%)	≤ 0.16	≤ 0.25	≥ 0.30	≤ 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 ≤ 0.4% (Thickness ≤ 16 mm)

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]
P245NB	245	360 - 450	26 (t < 3 mm) 34 (3 ≤ t ≤ 5 mm)	27J (at 0°C)

Applications

The primary use of P245NB steel plates and strips is for manufacturing various refillable welded steel gas cylinders, suitable for non-corrosive or mildly corrosive gases. Common applications include:

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

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

3. Fire extinguisher cylinders.

4. Other medium to low-pressure welded pressure vessels.

Other Information

Usage Precautions

1. Medium Restrictions: Suitable only for non-corrosive or weakly corrosive gases (such as air, nitrogen, liquefied gas, natural gas, etc.). Use with highly corrosive media like strong acids, strong alkalis, or halogens is strictly prohibited (stainless steel or corrosion-resistant alloys must be used instead).

2. Thickness and Strength Matching: When the steel thickness exceeds 16mm, the yield strength will gradually decrease as required by standards. The wall thickness must be adjusted according to the cylinder's design pressure.

3. Low-Temperature Conditions: The impact energy test temperature for Grade B steel is 0°C. If used in low-temperature environments below -20°C, an upgrade to Grade C (-20°C impact) or Grade D (-40°C impact) is necessary to avoid the risk of brittle fracture.

International Equivalent Materials