• Model NO.：as the drawing
• Transport Package：Woodern Case
• Specification：length max 20m
• Trademark：FANGLE
• Origin：China
• Production Capacity：50000tons,Year

Basic Info.

Model NO. as the drawing Transport Package Woodern Case Specification length max 20m Trademark FANGLE Origin China Production Capacity 50000tons/Year

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: 80-600mm
Length: 8000-18000mm
Dimension tolerance:+0, -0.2mm
Roughness:Ra 0.4μm
Chromic Plating thickness:0.045-0.065mm
Straightness tolerance per meter:≤1mm
Length tolerance:±2mm
Workpiece rotate speed:80rpm
Process 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 etc
Manufacturing 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; and
Thread phosphating.
Chemistry(%)
Chemical Components of H13(4Cr5MoSiV1)

C	Si	Mn	S	P	Cr	Mo	Ni	V	H	O
0.32~0.45	0.80~1.20	0.20~0.50	≤0.008	≤0.012	4.75~5.50	1.10~1.75	≤0.25	0.80~1.20	≤2PPm	≤2PPm