What Types of Cracks Should Be Avoided During Titanium Alloy CNC Machining?
Sep 09, 2025
Products Description
High-speed CNC Machining Of Metal Parts
Thermal Cracks:
During the CNC machining of titanium alloys, poor thermal conductivity causes cutting heat to concentrate in the cutting area, leading to excessively high local temperatures. When heat accumulation exceeds the material's tolerance limit, thermal cracks can occur. Additionally, improper selection of cutting parameters, such as excessively high cutting speeds or feed rates, can exacerbate the formation of thermal cracks.
Cold Cracks:
During the cooling process after titanium alloy CNC machining, the material's low elastic modulus results in significant internal stress during contraction. When these internal stresses exceed the material's yield strength, cold cracks may form. The probability of cold cracks increases, particularly when machining in low-temperature environments or when the workpiece is cooled too rapidly after processing.
Fatigue Cracks:
During titanium alloy CNC machining, the periodic cutting force between the tool and the workpiece generates alternating stresses on the workpiece surface. Prolonged exposure to these alternating stresses can lead to fatigue cracks on the surface of titanium alloy workpieces. Factors such as tool wear, unreasonable machining paths, and machine tool vibrations can increase the likelihood of fatigue cracks.
Stress Concentration Cracks:
If geometric discontinuities such as sharp corners, notches, or grooves exist in titanium alloy workpieces during machining, stress concentration can occur. In these areas, the actual stress experienced by the material far exceeds the average stress, making it easier for cracks to form when the material's strength limit is exceeded. Additionally, surface defects such as tool marks or scratches generated during machining can also become sources of stress concentration, leading to cracks.
Titanium product forms available from GNEE
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Material
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Pure titanium and Titanium alloy
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Titanium Grade
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Grade 1-Unalloyed titanium
Grade 2-Unalloyed titanium
Grade 3-Unalloyed titanium
Grade 7-Unalloyed titanium plus 0.12 to 0.25 %palladium
Grade 9-Titanium alloy (3 % aluminum, 2.5 % vanadium)
Grade 12-Titanium alloy (0.3 % molybdenum, 0.8 % nickel),
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Standard
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ASTM B338/ASME SB338, ASTM B337/ASME SB337, ASTM B861/ASME SB861, ASTM B862/ASME SB862,AMS4911,AMS4928
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Shape
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Round Square Rectangle
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Type
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Seamless/Welded
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Seamless titanium tube: Titanium sponge-Compacting electrodes-melting-Forge-Bar billets-Extruding-Rolled-Straightening-Seamless tube
Welded titanium tube: Titanium sponge-Compacting electrodes-melting-Forge-Plate billets-Hot rolled-Cold rolled-Titanium scrap-Welded-Welded tube |
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Surface
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Polishing, picking, acid washed, black oxide
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Application
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1) General service industries (petroleum, food, chemical, paper, fertilizer, fabric, aviation and nuclear
2) Fluid, gas and oil transport
3) Pressure and heat transmission
4) Construction and ornament
5) Boiler heat exchangers
6) Motorbycle and bike
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Material Milling Certificate
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According to. EN 10204.3.1
Including Chemical composition and Mechanical property |
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Grade |
Gr1, Gr2, Gr3,Gr4,Gr5, Gr7, Gr6,Gr9, Gr11, Gr12 ,Gr16, Gr17,Gr25 |
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Size |
All sizes can be customized |
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Application |
Metallurgy, electronics, machinery, medical treatment, chemical industry, petroleum, medical treatment, aerospace |
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Feature |
High corrosion resistance, low density, good thermal stability |
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Technology |
Hot Forged, Hot Rolled, Cold Rolled, Annealing, Pickling |
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Surface |
Bright, Polished, Pickling, Acid cleaning, Sandblasting |
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Packing |
Export Standard Woodcase |
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Delivery time |
10-25days according to the quantity and process of the product |
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Quality and test |
Hardness test, Bending test, Hydrostatic etc. |
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Grade |
GR1,GR2,GR3,GR5,GR6,GR7,GR9,GR11,GR12, etc. |
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Standard |
ASTM B265,ASTM F136,ASTM F67,AMS4928 |
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Size |
0.5-5.0mm x 1000mm x 2000-3500mm (Thickness x Width x Length) |
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Application |
Metallurgy, electronics, machinery, medical treatment, chemical industry, petroleum, medical treatment, aerospace |
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Supply status |
M (Y/ R/ ST) |
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Feature |
High corrosion resistance, low density, good thermal stability |
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Technics |
Hot Forged, Hot Rolled, Cold Rolled, Annealing, Pickling |
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Surface |
Bright, Polished, Pickling, Acid cleaning, Sandblasting |
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Packing |
Export Standard Woodcase |
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Payment terms |
T/T, L/C, D/A, D/P, Escrow, Western Union, PayPal |
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Certificate |
ISO 9001:2008; The third test report; TÜV Rheinland; |
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Delivery time |
7-15days according to the quantity and process of the product |
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Quality and test |
Hardness test, Bending test, Hydrostatic etc. |
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Material |
Pure titanium and Titanium alloy |
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Titanium Grade |
GR1/GR2/GR3/Gr4/GR5/GR7/GR9/GR12/Gr5Eli/Gr23
ERTi-1/ERTi-2/ERTi-3/ERTi-4/ERTi-5Eli/ERTi-7/ERTi-9/ERTi-11/ERTi-12 Ti15333/Nitinol Alloy |
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Standard |
AWS A5.16/ASTM B863/ASME SB863, ASTMF67, ASTM F136, ISO-5832-2(3) etc |
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Shape |
Titanium Coil Wire/Titanium Spool Wire/Titanium Straight Wire |
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Wire Gauge |
Dia(0.06--6) *L |
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Process |
Bar billets-hot rolling-drawing-annealing-strength-pickling |
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Surface |
Polishing, picking, acid washed, black oxide |
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Main Technique |
Hot Forged; Hot Rolled; Cold drawn; Straighten etc |
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Material Milling Certificate |
According to. EN 10204.3.1 |
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Application |
Welding, Industry, Medical, Aerospace, Electronic etc |
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Material Available |
Aluminum, Stainless Steel, Carbon Steel, Brass, Bronze, Copper, Titanium and etc |
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Surface Treatment Available |
Anodized, Nickel Plated, Zinc Plated, Chrome Plated, Passivation, Electrophoresis, Electropolishing, Painting, Powder Coated, etc |
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Certificate &Standard |
ISO9001 certified factory with good quality control and all of our products are 100% inspected before delivery. |
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Equipments |
Over 28 CNC Milling Machines (3,4, 5 Axis) & 22 CNC Turning machines can support your large order demand. |
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Design |
OEM & ODM are welcome, and also we have a R&D team and can help your design and develop your products |
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Application |
Different kinds of cars, machinery, home appliance, electronic products, electric appliance, stationery, computers, power |
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MOQ |
No quantity limitation |
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Samples |
Welcome you to request samples to test and check the quality. |
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Delivery & Shipping |
We can deliver to over 50 countries all over the world, shipping by DHL, FedEx, UPS, etc around 3 to 5 days |
GNEE is a specialized manufacturer and exporter of high-quality titanium products, including pipes, sheets, bars, wires, and fabricated parts.
We utilize advanced CNC machining, rolling, and welding equipment to ensure precision manufacturing. All products undergo strict chemical, mechanical, and non-destructive testing to guarantee compliance with international standards.
Our export-safe packaging includes wooden crates and waterproof wrapping to ensure secure delivery. If you have any needs, please feel free to contact us immediately：info@gneemetal.com
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