Introduction to Common Specifications and Machinability of HP295 Welded Gas Cylinder Steel Strip

HP295 welded gas cylinder steel strip is a kind of special low-carbon microalloy steel specially developed for the manufacture of welded gas cylinders, which is formulated in accordance with the Chinese national standard GB/T 6653 《Steel Plates and Strips for Welded Gas Cylinders》.

As a core material for low-pressure gas cylinders that are closely related to daily life and industrial production, it is widely used in the production of civil liquefied petroleum gas (LPG) cylinders, small low-pressure gas containers and other products due to its balanced mechanical properties, excellent processing performance and high safety performance.

HP295 Welded Gas Cylinder Steel

The "HP" in HP295 is derived from the Chinese pinyin abbreviation of "welded bottle", which directly indicates its application field - welded gas cylinders; the number "295" represents the minimum yield strength of the steel strip, that is, the yield strength is not less than 295MPa, which is the core index to measure its bearing capacity.

Different from ordinary carbon steel, HP295 steel strip adopts low-carbon and low-impurity design, and is properly microalloyed, which not only ensures the strength required for gas cylinder use, but also has good plasticity, toughness and weldability, solving the contradiction between strength and processability that is easy to appear in steel materials.

It is usually produced by hot rolling process, with uniform thickness, smooth surface and stable internal quality, which can meet the mass production requirements of gas cylinders.

Thickness

According to the requirements of GB/T 6653 and actual application scenarios, the common thickness range is 1.6mm ~ 12mm, among which the thickness of 2.0mm ~ 3.5mm is the most widely used.

Specifically, the 2.0mm ~ 3.0mm thick steel strip is mainly used for civil LPG cylinders (such as 2kg, 5kg, 15kg common household models), accounting for about 90% of the total output of civil gas cylinders; the 3.0mm ~ 12mm thick steel strip is suitable for small industrial low-pressure gas cylinders and special gas containers with slightly higher pressure requirements.

The thickness tolerance of the steel strip is strictly controlled to ensure the uniformity of the cylinder wall, avoid local stress concentration, and ensure the safety of gas cylinders during use.

Width

The common width range is 800mm ~ 1630mm, and some special specifications can be adjusted to 500mm ~ 2500mm according to customer needs.

• steel strip with width of 800mm ~ 1200mm is suitable for small and medium-sized gas cylinders with diameter of less than 500mm;
• steel strip with width of 1200mm ~ 1630mm is used for large-capacity civil or small industrial gas cylinders

In addition to dimensional specifications, the performance indicators of HP295 steel strip also have clear standard requirements, which are the core guarantee of its safety and processability:

Mechanical properties: Yield strength ≥ 295MPa, tensile strength 440 ~ 560MPa, elongation ≥ 20% (for thickness < 3mm) or ≥ 26% (for thickness ≥ 3mm), 180° bending test without cracks (bend radius 1.5a ~ 2.0a);

Chemical composition: Strictly control harmful impurities, with C ≤ 0.20%, Si ≤ 0.35%, Mn ≤ 1.50%, P ≤ 0.035% (usually controlled ≤ 0.025% in actual production), S ≤ 0.035% (usually ≤ 0.015%), and Als ≥ 0.015% to ensure deoxidation effect and grain refinement;

Delivery state: It can be supplied in hot-rolled, normalized, tempered or TMCP + tempered state according to customer needs, and can also be subjected to shot blasting, painting and other surface treatments to improve corrosion resistance.

• The delivery state: the normalized or tempered steel strip has better plasticity and toughness, and the machinability is better than the hot-rolled state directly supplied;

• The thickness and width tolerance: the steel strip with small tolerance can avoid uneven stress during processing and reduce the risk of deformation;

• The processing parameters: reasonable selection of stamping speed, welding current, cutting speed and other parameters can further improve the processing efficiency and product quality, and reduce tool wear and processing defects.

• Production of civil LPG cylinders,
• Small portable gas cylinders,
• Acetylene gas cylinders,
• Propane containers
• Other products

Is also widely used in petrochemical, power station and other fields to manufacture small low-pressure pressure vessels. With the implementation of the new national standard GB 5842-2023, the performance requirements of HP295 steel strip are further improved, especially the strict control of the yield ratio, which makes its safety and reliability more guaranteed.

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What products is HP295 mainly used for?

It is mainly used in the manufacture of pressure vessels such as liquefied petroleum gas cylinders, acetylene cylinders, oxygen cylinders, and liquid chlorine cylinders.

Can HP295 be used in high-pressure cylinders?

It is suitable for medium and low-pressure cylinders (design pressure is usually ≤10MPa). High-pressure cylinders require a higher strength grade (such as HP345).

Can HP295 be used in low-temperature environments?

The operating temperature range is generally -20℃ to 60℃. Impact toughness needs to be verified in low-temperature environments.

What are the typical specifications of HP295 cylinders?

Common specifications include water volumes of 23.5L, 35.5L, and 118L, with an operating pressure of 2.36MPa.

Can HP295 be used in automotive liquefied petroleum gas cylinders?

Yes, but it must meet the additional requirements of the automotive industry for material performance and safety.