SCARFING INSERT_SNMA 2509-R

T9335 grade characteristics

• Functionally gradient substrate with medium grain size and relatively high cobalt content.
• MT-CVD coating of medium thickness with a special surface finish.
• Very high strength. Designed for machining material groups P, M and S at medium cutting speeds.
• Suitable for continuous and heavily interrupted cuts, and withstands very unfavourable machining conditions.

Reading the code SNMA 250924-R00

• S: square insert shape
• N: 0° clearance angle (negative insert)
• M: tolerance class
• A: cylindrical fixing hole, no chipbreaker
• 25: cutting edge length 25.4 mm
• 09: insert thickness 9.52 mm
• 24: corner radius 2.4 mm
• R00: working (profile) radius 0, straight cutting edge

Usage notes

• Cooling has a positive effect on tool life and is recommended.
• This insert removes the weld bead from the outside of the tube. The inside weld bead is removed with scarfing rings.

The Dormer Pramet SNMA 2509-R scarfing insert is designed for external scarfing, which trims the weld bead left on the outside of tubes during welded tube production. The SNMA 250924-R00:T9335 version has a straight cutting edge with no profile radius, so it suits the flat faces of square and rectangular tubes.

Key features

• Square negative insert with 0° clearance and a flat top without chipbreaker. The double-sided design provides 8 cutting edges.
• Main cutting edge length of 25.4 mm, thickness of 9.52 mm and a central cylindrical fixing hole.
• T9335 grade with a functionally graded WC-Co substrate of medium grain size and relatively high cobalt content, giving very high strength.
• Medium-thickness MT-CVD coating with a special surface finish. The tough coated carbide withstands the extreme heat of the scarfing process.
• The cutting edge geometry delivers excellent tube surface quality and long tool life.

Applications

• External weld bead removal on welded square and rectangular tubes.
• Workpiece materials: steel (ISO P), stainless steel (ISO M) and super alloys (ISO S).
• Continuous and heavily interrupted cuts at medium cutting speeds, including very unfavourable machining conditions.

Square negative insert with 90° corners and 0° clearance on all sides. Both faces are flat with no chipbreaker, so the insert can be turned over and indexed to use all 8 cutting edges. A cylindrical fixing hole passes through the centre.

• Cutting edge length L: 25.4 mm (equal to inscribed circle IC 25.4 mm)
• Thickness S: 9.52 mm
• Fixing hole diameter D1: 9.12 mm
• Corner radius RE: 2.4 mm
• Cutting edge profile: R00, straight edge with no profile radius

How to choose the right scarfing insert

• Tube profile: the number after R in a Dormer Pramet scarfing insert code is the working radius in mm. R00 has a straight cutting edge for the flat faces of square and rectangular tubes. Round tubes need an insert whose working radius matches the tube outside diameter.
• Top form: SNMA inserts have a flat top, while SNMX inserts have a concave top.
• Workpiece material: T9335 covers steel (P20-P45), stainless steel (M15-M40) and super alloys (S15-S25).
• Cutting conditions: the tough T9335 substrate, with its relatively high cobalt content, suits continuous and heavily interrupted cuts. Use coolant to extend tool life.
• Inside weld bead: for the inside of the tube, use Dormer Pramet PSR scarfing rings instead of an insert.