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The following tables give some general guidance on machining of stainless steel bars. Much more detailed information is available from Atlas, particularly on the Ugima range of grades.
The graph shows the machinability of standard austenitic stainless steels in relation (%) to 4307. A typical recommendation for 4307 is estimated to 160 m/min for Cemented carbide (CC) set as 100% and 25 m/min for High speed steel tools (HSS) set as 100%.
Grade 416 offers exceptionally good machinability, the highest of any of the commonly available stainless steels. Best machinability is in the sub-critical annealed condition. Typical Applications. Valve parts, pump shafts, automatic screw machined parts, motor shafts and washing machine components. Bolts, nuts, studs and gears.
Selection of the proper stainless steel from the many types available requires an evaluation based upon four important criteria. Listed in order of importance, they are: Corrosion or Heat Resistance — the primary reason for specifying stainless steel. The specifier needs to know the nature of the environment and the degree of corrosion or ...
2205 Machining Guideline - 1. Machinability ranking. a machinability ranking. This ranking, where a higher figure means better machinability, is based on a combination of test data from several differ.
Comparing machinability. Comparisons of the machinability of different stainless steel grades are based on machinability indices (Vx) derived under standardized test conditions (ISO 3685). Vx is usually expressed as the cutting speed that is needed to give a certain predetermined tool life.
Source: Sandvik. Twist drilling with high-speed steel drills. Guidelines for twist drilling duplex stainless steels with high-speed steel drills are provided in Tables 2 and 3. Drill geometry: point angle 130°; self-centering drill point geometry is recommended; web thinning for large diameter drills is recommended.
