1、Good products come from good sources -- serious control of raw materials
First of all, we use the high qualified steel tube material, the advantages of our materials as following:
（1）、Table of chemical element comparison of material (Standard value VS HuaChen value)
Note: Each chemical element composition value narrowed dowm, so make sure the guarantee of high strength and has good toughness, then the safety of cylinders will be improved greatly.
（2）、Comparison of diameter and wall thickness tolerances:
Note: The outside diameter tolerance narrowed down to ensure the uniformity of appearance; The wall thickness tolerance narrowed down so the weight tolerance will be smaller.
（3）、Comparison of degree of curvature, out of roundness and wall thickness unevenness and steel weight deviation.
Note: Further ensure the appearance of unity and reduce body weight deviation.
2、LiShan seamless gas cylinder bottom size is superior to the standards and design requirements.
For an example of 219mm cylinders to show thickness of bottom.
Note: This is the anatomical drawing of Φ219 cylinder, the standard thickness S=5.7mm and the designed bottom thickness S1≧13mm, S2=10.3mm, S3=12mm, H=30mm.
3、The strength is superior to the standard requirements, and metallographic organization meets the standard requirements.
Following will show the strength and organization advantages with the example of 219mm cylinder.
4、Each cylinder will mill the bottom after bottom forming, then can directly visual observation of the bottom fusion situation. If any unqualified, will be picked out. We can make sure that every cylinder reaches to customer is qualified, you can rest assured to use.
5、Both the inside and outside surface adopt the shot peening treatment to ensure no rust when using.
