• Model NO.：as the drawing
• Application Range：Continuous Rolling Mill,Mpm,Fqm,Pqf
• Transport Package：Woodern Case
• Specification：max 20m, Diameter 100mm-500mm
• Trademark：FANGLE
• Origin：China
• Production Capacity：50000tons,Year

Basic Info.

Model NO. as the drawing Application Range Continuous Rolling Mill,Mpm,Fqm,Pqf Transport Package Woodern Case Specification max 20m, Diameter 100mm-500mm Trademark FANGLE Origin China Production Capacity 50000tons/Year

Product Description

Hard chrome plated mandrel bar used for mandrel mill process

Description
Mandrel bar with chrome plating 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 mandrel bar by grooved rolls in a stretch reducing rolling process to produce a tube or a tube blank. The mandrel bar 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. Mandrel bars are manufactured with lengths of up to roughly 20 m and production diameters of currently up to a maximum of 500 mm.



Production process:
1) forging
2) rough machining
3) magnetic test
4) heating treatment
5) ultrasonic test
6) finish machining
7) chromium plating
8) thread phosphating
9) package

 Products Parameters

Materials	AISI H13, X35CrMo V51 ,4CrMoSi V1,28NiCrMoV10 etc.
Diameter	80-600mm
Length	max to 20,000mm
Hardness	Meet the customers' requirements
Surface Processing	Chrome plating
Threading	Available, phosphating
Chrome plating	As per requirement,thickness 0.045-0.065mm
Process	EBT + LF (VD) + ESR
Property tests	Magnetic testing,Ultrasonic testing etc.
Lead time	about 45 days
Delivery condition	Finished machining
Application	MPM, PQF and FQM mills,Assel Mills,Accu-roll mill, Push Bench, Pilger mill,continuous tube mill etc
Market	India,Saudi Arab,Russia,Slovenia,Thailand,Vietnam etc.

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