Yantai Fangle Metallurgy Group Co., Ltd.  

Product Name: Fine Quality Mill Mandrel for Producing Seamless Steel Tubes Model NO.: as the drawing Application: metal Processing Machinery Parts Material: Alloy Customized: Customized Standard: DIN, ASTM, GB Certification: CE, ISO9001 Application Range: Fine Quality Mill Trademark: FANGLE Transport Package: Woodern Case Specification: length max 20m Origin: China Product Description MPM & PQF mandrel bars are also named retained mandrels.Mandrel bars are the key parts during the production of Seamless Tubes and Pipes. once the billet has been pierced, the Mandrel Bar supports the tube internally during elongation and wall thickness reduction.Mainly technical parameters are below:(1)Diameter : up to 500mm;(2)Length: max to 20,000mm;A variety of seamless tube mill types including;MPM, PQF and FQM mills;Assel Mills - both floating and retained;Material specification as required, including AISI H13, X35CrMo V51 and 4CrMoSi V1;Threading available ;Chrome plating;Both solid and hollow bars.Detail specification:Material: H13, 4Cr5MoSiV1;Range of dimensions: 80-600mmLength: 8000-18000mmDimension tolerance:+0, -0.2mmRoughness:Ra 0.4μmChromic Plating thickness:0.045-0.065mmStraightness tolerance per meter:≤1mmLength tolerance:±2mmWorkpiece rotate speed:80rpmProcess route: EAF+VD+LF+ESR;Application:Mandrel Bars for seamless tube production like PQF/MPM/FQM Rolling Mill, Assel Mill, Accu-roll mill, Push Bench, Pilger mill etcManufacturing process:Steel making (EBT + LF (VD) + ESR);Forged using both hydraulic press and rotary forging;Annealing;Rough machining;Magnetic testing;Heat treatment - either vertical or horizontal;Ultrasonic testing;Finish machining including threading if required;Chrome plating; andThread phosphating.Chemistry(%)ChemicalComponentsofH13(4Cr5MoSiV1)CSiMnSPCrMoNiVHO0.32~0.450.80~1.200.20~0.50≤0.008≤0.0124.75~5.501.10~1.75≤0.250.80~1.20≤2PPm≤2PPm