SCARFING INSERT_SNMX 25-R

Grade T9335

• Functionally graded substrate with medium grain size and relatively high cobalt content
• MT-CVD coating of medium thickness with a special surface finish
• Designed for ISO material groups P, M and S at medium cutting speeds
• Suitable for continuous and heavily interrupted cuts; also withstands very unfavourable machining conditions
• ISO application range: P20-P45, M15-M40 and S15-S25

Tooling and spare parts

• Toolholder: PXFNR/L 3232 S 25 (right-hand R or left-hand L) for external scarfing
• Shim: SNU 250424-R
• Spare parts: SNU 250424-R, PU 06, US 47, NT 08, MT 08, HXK 5

Usage guidance

• Coolant is recommended; it has a positive effect on tool life
• Clean the insert seat and shim before clamping, and tighten the clamping parts securely so the insert cannot vibrate
• When wear starts to affect the tube surface quality, index to a fresh cutting edge or turn the insert over to use the second face
• Wear eye protection; scarfing chips are hot and sharp

The SNMX 25-R00:T9335 is an external scarfing insert from the Dormer Pramet scarfing programme. Tube and pipe mills use it to cut away the weld bead left on the outside diameter of the tube after longitudinal welding. Dormer Pramet makes its scarfing inserts from tough coated cemented carbide that can handle extreme heat. The cutting edge geometry gives excellent tube surface quality and long tool life.

Key features

• Double-sided, negative (0° clearance) square insert, size 25 (25.4 mm cutting edge length and inscribed circle)
• R00 version: profile radius PFRAD 0 mm, meaning there is no working radius on the main cutting edge
• T9335 grade: functionally graded WC-Co substrate with an MT-CVD coating of medium thickness
• Very high strength; withstands continuous and heavily interrupted cuts as well as very unfavourable machining conditions
• Stable clamping in PXFNR/L holders stops insert vibration for reliable operation
• High-quality surface finish thanks to cutting edge accuracy

Applications

External (OD) weld bead removal on welded tubes and pipes in steel (ISO P), stainless steel (ISO M) and super alloys (ISO S).

Insert dimensions

Compatible holder

Square, negative, double-sided scarfing insert with a central fixing hole.

• Shape: square with four 90° corners; cutting edges on both faces (double-sided)
• Cutting edge length L: 25.4 mm
• Inscribed circle IC: 25.4 mm
• Thickness S: 12.2 mm
• Fixing hole diameter D1: 9.12 mm, through the centre of the insert
• Main cutting edge profile: PFRAD 0 mm (R00), no concave working radius
• Clearance angle: 0° (negative insert)

How to choose a scarfing insert

1. Match the insert size to the holder. Size 25 inserts (SNMX 25-R) fit the PXFNR/L 3232 S 25 holder with shim SNU 250424-R. Sizes 15 and 19 use the PXFNR/L 2525 holders.
2. Match the profile radius to the tube outside diameter. Radiused SNMX 25-R inserts are offered from R50 to R200. The number after R is the working radius PFRAD in mm. The R00 insert has no working radius.
3. Match the grade to the material. T9335 covers steel (P), stainless steel (M) and super alloys (S). It is tough enough for interrupted cuts and unstable working conditions.

SNMX 25-R range in grade T9335 (catalogue reference)

For smaller tubes, the SNMX 15-R and SNMX 19-R ranges offer smaller profile radii.