Yantai Fangle Metallurgy Group Co., Ltd.  

Product Name: Hard Chrome Plated Mandrel Bar Used for Mandrel Mill Process Model NO.: as the drawing Application: metal Processing Machinery Parts Material: Alloy Customized: Customized Standard: DIN, ASTM, GB Certification: CE, ISO9001 Condition: New Application Range: Continuous Rolling Mill,Mpm,Fqm,Pqf Trademark: FANGLE Transport Package: Woodern Case Specification: max 20m, Diameter 100mm-500mm Origin: China Product Description Hard chrome plated mandrel bar used for mandrel mill processDescriptionHard chrome plated mandrel bar plays a very important role in the mandrel mill process. The Mandrel is the important tool for MPM or FQM during seamless tube production .When rolling seamless tubes, a pre-pierced steel billet is rolled over a mandrelbar by grooved rolls in a stretch reducing rolling process to produce a tube or a tube blank. The mandrelbar determines the shape of the inner tube surface.During production ,it needs 6-7 pieces mandrel to stand by in turns .its surface temperature will reach 700ºC during production and then cooled to 80-120ºC after production ,it requires good quality and long lifetime. Mandrelbars are manufactured with lengths of up to roughly20m and production diameters of currently up to a maximum of 500mm.We have the ability to produce mandrel bars for MPM and FQM, with yearly capacity around 20000 tons.Production process:1) forging2) rough machining3)magnetic test4) heating treatment5) ultrasonic test6) finish machining7) chromium plating8)thread phosphating9) packageProducts ParametersMaterialsAISI H13, X35CrMo V51 ,4CrMoSi V1,28NiCrMoV10 etc.Diameter80-600mmLengthmax to 20,000mmHardnessMeet the customers'requirementsSurface ProcessingChrome platingThreadingAvailable, phosphatingChrome platingAs per requirement,thickness 0.045-0.065mmProcessEBT + LF (VD) + ESRProperty testsMagnetic testing,Ultrasonic testing etc.Lead timeabout 45 daysDelivery conditionFinished machiningApplicationMPM, PQF and FQM mills,Assel Mills,Accu-roll mill, Push Bench, Pilger mill,continuous tube mill etcMarketIndia,Saudi Arab,Russia,Slovenia,Thailand,Vietnam etc.Production process control1.Mandrel tests. 1.1 Mechanical properties 1.2 Tensile and impact tests Tensile strength Yield strength Elongation: Reduction of area Charpy V-Notch impact test: testing at room temperature. Charpy tests will be in transverse orientations.1.3Hardness tests 1.4Microscopically Examinations 1.5Microstructure after Heat Treatment1.6 Austenitic Grain Size 1.7Nonmetallic Inclusion Contents 1.8Non destructive Tests2.Straightness3.Machining4.Chrome plating5.Marking6.Protection and Packing7.CertificationMandrel products show Mandrel workshop showCustomer Visit