| HAYNES® 556® alloy is similar in machining characteristics to other solid-solution-strengthened nickel-base alloys. These alloys as a group are classified as moderate to difficult tomachine; however, it should be emphasized that they can be machined using conventional methods at satisfactory rates. As these alloys will work-harden rapidly, the keys to successful machining are to use lower speeds and feeds, and to take heavier cuts than would be used for machining stainless steels. See Haynes International publication H-3159 for more detailed information. |
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Normal Roughing (Turning / Facing) |
| Use carbide C-2 / C-3 grade tool
Speed: 90 surface feet / minute
Feed: 0.010 in. / revolution
Depth of cut: 0.150 in. |
Negative rake square insert, 45° SCEA'
1/32 in. nose radius. Tool holder: 5° negative back and side rakes.
Lubricant: Dry2, oil3 or water-base4,5. |
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Finishing (Turning / Facing) |
Use carbide C-2 / C-3 grade tool
Speed: 95-110 surface feet / minute
Feed: 0.005-0.007 in. / revolution
Depth of cut: 0.040 in. |
Positive rake square insert, if possible,
45° SCEA' 1/32 in. nose radius. Tool holder:
5° positive back and side rakes.
Lubricant: Dry or water-base. |
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Drilling |
Use high speed steel M-33 / M-40 series6 / or
T-15 grades*
Speed: 10-15 surface feet / minute (200 RPM maximum for 1/4 in. diameter or smaller)
Lubricant: oil or water-base. Use coolant feed drills if possible. |
Short, heavy-web drills with 135° crank shaft point. Thinning of web at point may reduce thrust.
Feed:
0.001 in. rev. 1/8 in. dia.
0.002 in. rev. 1/4 in. dia.
0.003 in. rev. 1/2 in. dia.
0.005 in. rev. 3/4 in. dia.
0.007 in. rev. 1 in. dia. |
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| *Carbide drills not recommended, but may be used in some set-ups. See Haynes International publication H-3159 for details. |
| Notes |
1 |
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SCEA - side cutting edge angle, or lead angle of tool. |
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2 |
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At any point where dry cutting is recommended, an air jet directed on the tool may provide substantial tool life increases. A water-base coolant mist may also be effective |
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3 |
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Oil coolant should be a premium quality, sulfochlorinated oil with extreme pressure additives.
A viscocity at 100°F of from 50 to 125 SSU is standard |
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4 |
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Water-base coolant should be a 15:1 mix of water with either a premium quality, sulfochlorinated water soluble oil or a chemical emulsion with extreme pressure additives. |
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5 |
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Water-base coolants may cause chipping or rapid failure of carbide tools in interrupted cuts. |
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6 |
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M-40 series High Speed Steels include M-41 through M-46 at time of writing, others may be added, and should be equally suitable. |
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