High speed machinability steels with high sulphur content
High speed machinability steels Austenitic stainless steel Valbruna Stainless Steel

Austenitic Stainless Steel

 Machinability
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CUTTING DATA RECOMMENDATIONS MAXIVAL 1.4460 - MV274MDE
     
VALBRUNA GRADE STANDARD STEEL CONDITION
     
MV274MDE   ANNEALED
  -W.No. 1.4460 Grade 329 -HARDNESS HB= ca.200
  -EN 10088=X3CrNiMoN 27 5 2 -TENSILE STRENGTH= ca.700 Mpa

 

Turning
FEED CUTTING DEPTH CUTTING SPEED
( min/rev ) ( mm ) Cemented Cemented Cemented High speed steel
carbide P10 carbide P20 carbide P35  
<0.3 <2 230 180 - 30
0.3 - 0.5 2 - 5 - 160 130 25
0.5 - 1.0 5 - 10 - 100 80 15

 

Drilling

- Twist drills, high-speed steel

  

- Point angle: 135° ; Helix angle: 40°

  
   
Drill dia. Speed Cutting Speed Feed N.B
(mm) (rev/min ) (m/min) (mm/rev) - Cooling and cutting liquid feed:
1 3200 -3800 10 - 12 0.05   ample about 10% emulsion
3 1270 - 1590 12 - 15 0.10 - When drilling with short NC drills,
5 760 - 950 12 - 15 0.20   the feed can be increased by about 40%
10 380 - 470 12 - 15 0.30 - When drilling to depths more than 4 x
  diameter, remove chips
15 250 - 320 12 - 15 0.30 - When using TiN-coated high-speed steel
20 180 - 240 12 - 15 0.35   drills, the cutting speed can be increased
30 130 - 160 12 - 15 0.35   by about 10%

 

      

- Indexable insert drills, cemented carbide

      
           
Drill dia. Cutting Speed Feed Type of cemented

N.B
(mm) (m/min) (mm/rev) carbide - Cooling and cutting liquid feed:
20 175 - 200 0.10 P25 P15   Liquid pressure: >0,3Mpa (3Kp/cmq)
30 175 - 200 0.12 P25 P15   Liquid amount : >25 1/min
40 175 - 200 0.15 P25 P15   Cutting data for indexable-insert drill-hole
50 175 - 200 0.20 P25 P15   drilling is highly dependent on the
  make of the drills used;
  the manufacturer's recommendations
  must also be considered

 

Milling

- Cemented carbide

      
Machining Cutting Speed Feed Type of cemented
  (m/min) mm/tooth carbide
Face milling 130 - 240 0.15 - 0.30 P10 - P40
Side milling 180 -220 0.25 - 0.30 P10 - P30
End milling 130 - 200 0.10 - 0.20 P10 - P30
End milling (solid cemented carbide) 50 - 100 0.05 - 0.20 P40

 

      

- High speed steel

      
Machining Cutting Speed (m/min) Feed (mm/tooth)  
Face milling 20 - 25 0.12 - 0.20  
Plain milling 20 - 25 0.12 - 0.20  
End milling 20 - 25 0.02 - 0.15  
Side milling 10 - 15 0.12 - 0.20  


Threading
         
Tool   Cutting Speed (m/min)    
Cemented Carbide ( P10 - P30 )   90 - 130    
High-speed steel   12 - 15    
         


Cutting Off
         
         
Tool   Cutting Speed (m/min) Feed (mm/rev)  
Cemented Carbide ( P30 )   90 - 140 0.10 - 0.20  
High-speed steel   25 0.05  
         
         


Reaming
Ream dia. ( mm )   Cutting Speed ( m/min )  
    Cemented carbide ( P30) High-speed steel Feed ( mm/rev )
<10   50 10 - 15 0.10 - 0.20
10 - 20   50 10 - 15 0.30
>20   50 10 - 15 0.30 - 0.40
 


N.B: The cutting data is to be considered as base values that must be adapted to local conditions.
The stated cutting data are based on tool life of 15 minutes for cemented carbides and 60 minutes for high-speed steel.
Coil and lubrificant: Emulsion or cutting oil.

If you need more technical information, please do not hesitate to contact our Quality Department: quality@valbruna.it

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