Brake system tube

ouble wall pipe can be applied in automobiles brake system, cooling system,airconditionor and refreigiator. OD from 4.76mm to 18mm Coating: copper, zinc, PVF inner or outside. Packing: first we adopt plastic film to wrap the small bundle and then seaworthy wooden case will be used to protect the goods well. Producing capacity: 50 mt per month 1. Technical properties: 2. Tolerance OD±0.08mmWT±0.05mm 2.Chemical proporties(%) C≤0.06Mn≤0.30S≤0.03P≤0.03Si≤0.03 3 Physical proporties Tensile strength≥290MPayeild strength≥180MPa≥35%(HR30T)≤58 4.the quality of the inner side 4.1 moisture inside of the pipe less than 30mg/. 4.2 impurity inside of the pipe less than 40mg/. 4.3 mineral oil inside of the pipe less than 10mg/. 4.4 PH inside of the pipe 6.5--7. 5. Technical capability 5.1 flared test flared rate can reach 30% pipe still do not broken. 5.2 pressing test 5.3 cold forming test 6.obturation test 6.1 put every pipe in to the special liquid.charge 2.0Mpa azot. Waiting for 5 to 8 minutes. If azone do not leakout, the pipe is tested as qualified.