DIN2391 St37.4 St52.4 Bk Nbk Steel Car Truck Motorcycle Tube

DIN2391 ST37.4 ST52.4 BK NBK steel car truck motorcycle tubeHigh Precision Seamless Steel Tube for Automotive Industry and Hydraulic Application  APPLICATIONS1. Automotive fields A. Fuel injection lines/nozzles B. CNG (Compressed Nature Gas) tube-- Burst pressure: 1307Bar, Working Pressure: around 350barC. Drive transmission: Steering column elements D. Gear shafts, hand brake, front axles, airbag inflators, stabilizers, seat fasteners, front-wheel drive shafts   E.  Shock absorber and others 2. Hydraulic FieldsA. Hydraulic circuits (HPL), pneumatic lines, and hydraulic suspension systemB. Hydraulic cylinders (HPZ) 3. Other Fields Hydraulic machines, Hydraulic cylinder, heat exchanger, high precision machines, oil lines, and others in need ADDITIONAL SURFACE TREATMENT AFTER TUBE MAKING  1. Galvanizing  A. Silver galvanized B. Yellow galvanized C. Olive green coated Layer thickness: 8-20um, Salty Spray Test: 48-150 hours 2.Black phosphate    Material Chemical Composition (%)  StandardSteel Grade Material NumberC   Si     MnP    S   CrMoDIN 2391ST351.0308