Machining DataSheet for

Machining Material Ti-425 MIL

Material Ti-425 MIL is a titanium alloy with a hardness of 36 HRC and a machinability rating of 17%.

Titanium alloys such as Ti-425 MIL are used in mechanical components for two main reasons:

• It has an excellent strength-to-weight ratio. On the one hand, it is almost as light as aluminum, and on the other hand, it has a higher strength than most steel alloys.
• It has superb corrosion resistance.

The main challenges of machining Ti-425 MIL are:

• Ti-425 MIL has very low heat conductivity. It causes heat generating from the cut to transfer mainly to the cutting tool instead of flowing to the chips and workpiece.
• It has high flexibility, thus bending easily by the cutting forces.
• High hardness of 36 HRC leads to premature wear.

Tip for machining Ti-425 MIL:

• Use a positive cutting edge in medium/roughing operation, preferably gound with a small honing size.
• In finish operations, use only ground inserts/tools with sharp cutting edges and minimal honing size.
• On supper-finish applications, you can also use cutting tools that are designed for aluminum without honing.
• On small diameter parts, on a workpiece with thin walls, or poorly clamped workpiece, be gentle with your depth of cut and feed rate to reduce the cutting force.
• Use an insert/tool with a very hard substrate because Ti-425 MIL has a hardness of 36 HRC

Summery:

For detailed carbide grades recommendations, check the Below Chart, or use the Grades Wizrad.

Recommended Cutting speed range for turning at stable conditions is 200 - 260 [SFM] / 60 - 80 [m/min].

Recommended Cutting speed range for milling with stable clamping and short overhang is 150 - 200 [SFM] / 45 - 60 [m/min]

For detailed cutting speed recomendations, check the Below Table, or use our Speed and Feed Calculator.

Equivalent International Designations for Material Ti-425 MIL

Standard	Name

Chemical Composition for Material Ti-425 MIL

Element	Amount
Aluminum (Al)	4.5%
Iron (Fe)	1.2-1.8%

Cutting Speeds Recomendations for Material Ti-425 MIL

* Click on the speeds below for higher precision in specific conditions!

Application	Vc (m/min)	Vc (SFM)
Turning	60-80	200-260
Milling	45-60	150-200
Parting	35-50	110-160
Grooving	50-70	160-230
Drilling	50-70	160-230

Recommended Carbide Grades for Material Ti-425 MIL

• Turning
• Parting Off
• Grooving
• Milling Indexable

Grade for Turning

Grade for Parting Off

Grade for Grooving

Grade for Milling (Indexable)

Recommended Insert Cutting Edge Geometry for Material Ti-425 MIL

Honing Siz		0.02-0.05 mm / 0.001-0.002"
Rake Angl		13° -18°
Land Angl		Neutral
Land Widt		0.10-0.20 mm / 0.004-0.008"
Ground Inser		Recommended

Learn more about carbide inserts Cutting-Edge Geometry Parameters.