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High Pressure Gas Cylinder Tubing

Shannxi Shew-E Steel Pipe Co.,Ltd | Updated: Jan 23, 2019

Most of the high-pressure gas cylinders are made of steel and can withstand working pressure of 10 ~ 40MPa. They are widely used in the industries like mining, construction, transportation, Marine, aviation, medical, military and so on. Steel gas cylinders can be divided into welded gas cylinder tubes and seamless gas cylinder tubes. Welded gas cylinders have been withdrawn gradually. Now the most gas cylinders in the international market are seamles and their working pressure can reach 12.25 ~ 29.40MPa.

Cylinder is a high pressure container storing gases or liquefied gases. In order to ensure its safety performance, the requirements of high tensile strength and yield strength is essential, even the high elongation and impact toughness. The cylinder is use in the temperature of -20 ~ 60 ℃ in normal environment, while in cold region it can up to -40 ~ 60 ℃. It is generally uses the normalizing or normalizing + tempering treatment of carbon manganese steel cylinder, but for cold area,chromium molybdenum steel or other alloy steel cylinder after tempering treatment is a general method.


Manufacturing method of seamless steel tubes for high-pressure gas cylinders:

(1) Pipe jacking -- use ingot (billet) punching -- pipe jacking method to make pipe blank for gas cylinder.This method is often used in steel pipe plants and heavy machinery plants.

(2) Pipe rolling- the ingot (or round rolling billet, continuous casting billet) after heating perforation, through the cycle rolling mill or automatic rolling mill, continuous rolling mill and other hot rolling tube billet, and then hot sizing, straightening into finished seamless steel tube.This is one of the most important methods used in mass production of cylinder tubes.In order to expand the scope of specifications, rolling mill can also pass the hot rolling billet, progress through the cold rolling (drawing) machine reducing wall reduction processing into manufacturing medium and small volume gas cylinder billet; The hot rolled tube billet can also be processed into tube billet for large volume gas cylinder by the hot expanding machine.

 

Standard

Grade

O.D

W.T

ASTM A519

4130、4140、4142、4145

219-720mm

5-50mm

EN10297

30CrMo4、34CrMo4、42CrMo4

219-720mm

5-50mm

DOT-3AA/3AAX

4130X

406-720mm

5-25mm

GB18248

37Mn、34Mn2V、30CrMo、35CrMo、34CrMo4

219-720mm

5-30mm

GB28884

30CrMoE、42CrMoE

219-720mm

5-50mm

 

The cylinder wall thickness is designed according to the minimum wall thickness. Specified the the minimum wall thickness, the wall thickness tolerance of seamless steel tube for high pressure gas cylinder should not be less than its minimum wall thickness to meet the cylinder body safety requirements. Once the the minimum wall thickness is given, the smaller the wall thickness is, the higher the wall thickness accuracy is, the lighter the cylinder weight and the larger the volume is. GB18248 is the main standard for the manufacture of gas cylinder tubes in China, mainly including 34Mn2V, 37Mn, 30CrMo, 34CrMo4 and other materials, used for the production of various gas and hydraulic cylinders. More details, call for us or email to info@shew-esteelpipe.com.

 

 


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