production process Step 1 : the material is 45# steel pipe produced from Tianjin Chinacut the material to different length, accoring to requirement. Step2: after cut off, treatment the steel pipe , strongen its hardness and toughness . Step3: primary process, remove the oxidation layer.strongen the beautiful surface and provide the base for welding flange. Step4: line boring, make the product straight line. Step5:honing Step6:semi finishing, confirmed the toally length, and treat the surface Step7: hard chrome. send the goods to electroplating workshop ,inner wall chrome Step8:precison turning then painting