The following are guidelines for performing typical machining operations upon C-22^® alloy wrought stock. Exact details for specific machining jobs will vary with circumstances of the particular job. Other tool materials not listed here may be suitable for machining C-22 alloy under various conditions. For further information, please consult Haynes publication H-2010.

Recommended Tool Types and Machining Conditions

Operations	Carbide Tools	High Speed Tools
Drilling	C-2 grade not recommended, but tipped drills may be successful on rigid setup of no great depth. The web must be thinned to reduce thrust Use 135° included angle on point, Gun drill can be used. Speed: 50 sfm. Oil² or water-base³ coolant. Coolant-feed carbide tipped drills may be economical in some setups.	M-33, M-40 series¹ or T-15: Use short drills, heavy web, 135° crank-shaft, grind points wherever possible. Speed: 10-15 sfm.
		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.
		Oil or water-base coolant. use coolant feed drills if possible.
Normal Roughing; Turning or Facing	C-2 or C-3 grade: Negative rake square insert, 45° SCEA⁴, 1/32 in. nose radius Tool holder: 5° neg. back rake, 5° neg. side rake. Speed: 90 sfm depending on the regidity of set up, 0.010 in. feed, 0.150 in. depth of cut. Dry⁵, oil, or water-based coolant.
Finishing; Turning or Facing	C-2 or C-3 grade: Positive rake square insert, if possible, 45° SCEA, 1/32 in. nose radius. Tool holder: 5° pos. back rake, 5° pos. side rake. Speed: 95-110 sfm, 0.005-0.007 in. feed, 0.040 in. depth of cut. Dry or water-base coolant.

NOTES:	1	M-40 series High Speed Steels include M-41, M-42, M-43, M-44, M-45 and M-46 at the time of writing. Others may be added and should be equally suitable.
	2	Oil coolant should be a premium quality, sulfochlorinated oil with extreme pressure additives. A viscosity at 100°F from 50 to 125 SSU.
	3	Water-base coolant should be premium quality, sulfochlorinated water soluble oil or chemical emulsion with extreme pressure additives. Dilute with water to make 15:1 mix. Water-base coolant may cause chipping and rapid failure of carbide tools in interrupted cuts.
	4	SCEA - Side cutting edge angle or lead angle of the tool.
	5	At any point where dry cutting is recommended, an air jet directed on the tool may provide substantial tool life increase. A water-base coolant mist may also be effective.

Haynes International, Inc. 800-354-0806 765-456-6012

HASTELLOY® C-22® alloy Information*

HASTELLOY^® C-22^® alloy Information*