Alloy 718 Machinability

Standard machining methods utilized for iron based alloys might be utilized. Alloy 718 works harden during machining and has higher strength and "gumminess" not typical of steels. Heavy duty machining equipment as well as tooling should be utilized to minimize chatter or work-hardening of the alloy in front of the cutting. Most any business coolant might be utilized as a part of the machining operations. Water-base coolants are favored for high speed operations, for example, turning, grinding or milling. Heavy lubricants work best for tapping, drilling, broaching or boring. Turning: Carbide tool is recommended for turning with a nonstop cut. High speed steel tooling should be utilized for interfering with slices and for smooth completing to close resilience. Tools should have a positive rake angle. Cutting speeds and feeds are in the accompanying reaches. Drilling: Steady feed rates must be utilized to maintain a strategic distance from work hardening because of harping of the drill on the metal. Rigid setups are crucial with as short a stub drill as practical. Heavy duty, high speed steel drills with heavy web is recommended. Feeds fluctuate from 0.0007 inches for each rev. for holes of less than 1/16" measurement, 0.003 inches for each rev. for 1/4" dia., to 0.010 inches for each rev. for holes of 7/8"diameter. Slow surface speed, as 8-10 feet/ minute, are best for drilling. Processing: To acquire great exactness and a smooth completion, it is fundamental to have unbending machines and fixtures and sharp cutting devices. High speed steel cutters, for example, M-2 or M-10 work best with cutting speeds of 5 to 15 feet per minute and feed of 0.001"- 0.004" per cutting tooth. Grinding: Alloy 718 should be wet ground and aluminium oxide wheels or belts are favored.

Applications

• Chemical processing
• Aerospace
• Liquid fuel rocket motor components
• Pollution-control equipment
• Nuclear reactors
• Cryogenic storage tanks
• Valves, fasteners, springs, mandrels, tubing hangers
• Well head completion equipment and blow out preventers (BOP's)
• Gas turbine engine parts