welding lpg cylinders

Capacity:12.5kg
Water capacity:26.2L
High total:590mm (+/-10mm)
Exterior dimension:300mm
Outside diameter of the guard:230mm
Outside diameter of the base:303mm
High of guard:143mm
Steel mateiral: HP295
High of base:75mm
Test pressure:34Bar
Work pressure:2.1M Par
1.The cylinders shall be constructed & tested according to ISO 4706 for steel cylinders.
2.Material of construction:fine grain,firebox quality steel having the following main characteristics:
a)Mechanical properties:
-Minimum yield strength: 240 N/mm2
-Tensile strength: 360-430 N/mm2
-Minimum elongation: 30%
b)Chemical composition - % max.
C 0.16
MN  0.50
Si  0.20
P 0.03
S 0.03
P+S 0.04
3.The final thickness of the cylinder not less than 2.5mm at any point of cylinder body.
4.Each cylinder shall be normalized at (675+/-20) °C
5.Weight of empty cylinder including valve reach at 15kg.