What is the SFM for stainless steel?
between 100-350
Generally speaking, when machining stainless steels a SFM of between 100-350 is recommended, with a chip load ranging between . 0005” for a 1/8” end mill up to . 006” for a 1” end mill.
What is H900 steel?
MIM 17-4 H900 is a precipitation hardening stainless steel. It offers a good balance between corrosion resistance and strength. It is magnetic and also hardens to various strength levels by varying the aging heat treat temperature.
How do you calculate rpm and feed?
feed rate = RPM * chip load * number of teeth. feed rate = 4584 * 0.004 * 2. feed rate = 36.7 inches per minute (IPM)…Example of a milling speed and feeds calculation
- RPM = (12 * surface speed) / (π * tool/workpiece diameter)
- RPM = (12 * 600) / (3.14159 * 0.5)
- RPM = 4584 rev/min.
What speed should you mill steel?
For Milling operations speeds may be increased by 50%. Lathe turning speeds may be increased by 100%. The best rule of thumb for proper cutting speed is the color of the chip when cutting steel….Basic Spindle RPM for Drilling and Milling.
| Spindle RPM for Cutter Diameter | Material | Mild Steel |
|---|---|---|
| 3/4″ | 350 | |
| 1″ | 260 | |
| 2″ | 130 | |
| 3″ | 90 |
What is SFM cutting speed?
Cutting speed is the speed in linear feet per minute or “Surface Feet per Minute” (SFM) that a given tooth (flute) on the cutter will be moving when it cuts through the material. All materials have a documented SFM or “cutting speed”. Think of it like a minimum and maximum speed limit on a highway.
How hard is H900?
It is one of the most widely used precipitation hardening grades, as it has high strength hardness up to about 572°F while demonstrating good corrosion resistance in all heat treated conditions….Machinability:
| Heat Treated Condition | H900 |
|---|---|
| 70 – 400°F | 6.0 x 10^-6 |
| 70 – 600°F | 6.3 x 10^-6 |
| 70 – 800°F | 6.5 x 10^-6 |
| 70 – 900°F | — |
What is the hardness of 17-4 H900?
C40
17-4 PH Stainless Steel Properties
| Condition | Ultimate Tensile Strength (PSI) | Hardness Rockwell |
|---|---|---|
| H900 | 190,000 | C40 |
| H1025 | 155,000 | C35 |
| H1075 | 145,000 | C32 |
| H1150 | 135,000 | C28 |
How hard is H900 stainless steel?
An H900, which can be a crap shoot as far as hardness, will land you Mid to High 40’s, approaching a 50C. It will be the easiest material you’ve every machined that is approaching a hardness of 50C. It will be easier and more predictable than 304. Once heat treated, you do not have to worry about the whole stainless “work hardening” BS.
Can 17-4 PH be heat treated?
17-4 PH is a chromium-nickel grade of stainless that may be hardened by a single low temperature precipitation-hardening heat treatment. Excellent mechanical properties at a high strength level may be obtained by such treatment. Scaling and distortion is minimized. 17-4 PH should not be used in the solution treated condition.
What is 1717-4 pH?
17-4 PH is a chromium-nickel grade of stainless that may be hardened by a single low temperature precipitation-hardening heat treatment. Excellent mechanical properties at a high strength level may be obtained by such treatment. Scaling and distortion is minimized.
What is the strength of 17 4 stainless steel?
The strength and corrosion resistance properties of 17-4 hold up well is service temperatures up to 800° F. Fabrication techniques for this steel is similar to those established for the regular stainless grades. 17-4 machines well, has excellent welding characteristics, and forges easily.