Facing the market slump and the slag of pipeline industry, the prosperous development of bellows compensator adds a new dynamism to this industry. Bellows compensator, which is also called metal hose, has its own unique characteristics and wide usages. It is a main pressure parts installed in the pressure pipeline and play a role of protecting corrugated pipe. The range of metal hose is from PN0.6 to PN32.0Mpa, and the highest can reach to 42.0Mpa. Because the main materials of components is austenitic stainless steel, which has a good heat resistance and corrosion resistance, so its working temperature range is wide, from Minus 196 to 600 degrees. The selection of SS is based on the medium flowing the hosepipe so that we can guarantee the corrosion resistance.