1.Custom-built pipe angle, pipe bend, elbow bend pipe. 2.silical sol technique. 3.Standard:ASTM,AISI,DIN,JIS ... coverage: aircraft manufacturing, ship building, auto, artificial limb, chemical, weapon, sanitary bath equipment and petroleum equipment etc..9. Products: valve, flange ... , elbow, screw nut, screw bolt, pipe fitting, impeller, coupling, pump parts and so on.