Fully Automatic MPT System for Steel Billet (S-LM)

Fully Automatic MPT System for Steel Billet (S-LM)

Super Line-Magna (S-LM)

This system performs fully automatic surface flaw inspection of steel billet utilizing fluorescent magnetic particle testing method while the billet being transferred on the V-roller conveyor. The flaw images captured by CCD cameras are identified through the image processing unit and the Map-data of flaw positions is created and transmitted to the upper controller. The positions of the flaw are marked by the paint markers based on the Map-data for removal in the grinding process later.


  • Fully automatic, in-line continuous inspection using CCD cameras and image processing unit, complete control from operation room thus no worker in the inspection area
  • Detecting longitudinal, transverse and corner defects simultaneously
  • Fast inspection speed, max. 40 m/min.
  • Outputting Map-data of flaw positions for each divided section of the billet surface, size of which is 100 mm (longitudinal) x 20 mm (circumferential)
Main Specification
Type of steel to be inspectedCarbon steel, Low alloy steel and Special steel
DimensionSquare billet 100-160 mm sq. (corner R 15-25 mm)
Billet transfer speedMax. 40 m/min.
Magnetizing methodCombined magnetization with Yoke coils and Ring coil
MPT materialFluorescent magnetic particle suspension
Defects to be detectedSurface breaking natural flaws (crack, scab etc.)
Detecting accuracyLongitudinal flaw (crack): more than 0.3 mm (depth) x 5.0 mm (length)
Transverse flaw (scab) : more than 0.3 mm (depth) x 5.0 mm (dia.)
(Two detecting levels can be set automatically)
Marking colorSurface : White Corner : Red
Marking dimensionUnit dimension approx. 15 W mm x 100 L mm
Electric powerAC 400/440 V±10%, 3-phase, approx. 300 KVA
AirMore than 0.4 MPa, 2.0 Nm3/min.
WaterService water 50 L/min.
Main Equipment
Billet washing equipmentWater spray nozzles and Air curtain blow Approx. 800 L x 1200 H x 700 W mm
Suspension spraying equipmentSuspension spray nozzles and air blow nozzles to uniform suspension on the bullet surface
Magnetizing equipment2 sets of Yoke coils and one Ring coil
Approx. 1100 L x 1050 H x 860 W mm
CCD cameraHigh-definition progressive scanning camera
44 W x 44 H x 78 D mm
Image processing unitApprox. 800 W x 1100 H x 600 D mm
UV lightHigh intensity Super-Light D-150
Marking machineSurface : M-20S Corner : M-30S
Suspension supply and collection tank unitApprox. 2000 L x 1500 H x 1000 W mm
2 sets of 500 L tank
Mixing tank unitApprox. 1000 L x 1200 H x 1000 W mm
1 set 500 L tank
Blower3.75 KW, AC 200 V, 3-phase

Inspection Procedure