P245NB Steel Sheet and Strip for Welded Gas Cylinders

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.

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

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.

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

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