ТТ7К12 · other
ТТ7К12 CVD
Properties of the CVD condition, compared with the other ТТ7К12 tempers.
Choose the TiCN/Al2O3/TiN coating on this tough substrate to raise wear resistance and permissible cutting speed in rough machining of steel.
What is ТТ7К12-CVD?
ТТ7К12-CVD is ТТ7К12 in the CVD condition — choose the TiCN/Al2O3/TiN coating on this tough substrate to raise wear resistance and permissible cutting speed in rough machining of steel. ТТ7К12-CVD has a tensile strength of 1,150 MPa (167 ksi), stronger than 90% of ceramic grades. Elongation at break is 0.2% and the elastic modulus is 520 GPa (75.4 Msi). ТТ7К12-CVD has a density of 13.15 g/cm³ (0.475 lb/in³), heavier than 87% of ceramic grades. It melts at 1,300°C (2,372 °F). VS is the default condition FabDigit quotes; CVD is available on request or by drawing note.
Advantages
- Tough — resists crack growth — 13.5 MPa·√m (12.3 ksi·√in), better than 95% of ceramic grades
- Ductile — tolerates forming and impact — 0.2%, better than 83% of ceramic grades
- Stiff — 520 GPa (75.4 Msi), better than 81% of ceramic grades
Limitations
- Heavy — 13.15 g/cm³ (0.475 lb/in³), worse than 87% of ceramic grades
- High embodied carbon — 28 kg CO₂/kg, worse than 83% of ceramic grades
- Needs corrosion protection — 55/100, worse than 77% of ceramic grades
ТТ7К12-CVD properties
Typical room-temperature values for ТТ7К12-CVD — 5 properties are specific to this condition; the rest are grade-level values shared by every ТТ7К12 temper. Each bar shows where the value sits among the ceramic grades in FabDigit's library — further right is higher.
Physical3
ТТ7К12-CVD has a density of 13.15 g/cm³ (0.475 lb/in³), heavier than 87% of ceramic grades. It melts at 1,300°C (2,372 °F).
Mechanical12
ТТ7К12-CVD has a tensile strength of 1,150 MPa (167 ksi), stronger than 90% of ceramic grades. Elongation at break is 0.2% and the elastic modulus is 520 GPa (75.4 Msi).
Thermal5
ТТ7К12-CVD is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 28 W/m·K (16.2 BTU/hr·ft·°F), better than 58% of ceramic grades. Thermal expansion is 6.5 µm/m·K (3.61 µin/in·°F).
Electrical1
ТТ7К12-CVD has an electrical resistivity of 2×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 77% of ceramic grades.
Sustainability4
Producing a kilogram of ТТ7К12-CVD takes about 320 MJ of energy and emits 28 kg of CO₂ — more than 77% of ceramic grades. Typical recycled content is 25%.
Manufacturability3
ТТ7К12-CVD's machinability is not recommended (5/100, worse than 58% of ceramic grades).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other ТТ7К12 tempers and conditions
ТТ7К12 is also supplied in 2 other conditions. The full side-by-side table is on the ТТ7К12 overview.
- VSDefaultUse the conventional vacuum liquid-phase sintered blank or insert as the general choice for heavy-duty steel turning and planing.1,200 HV
- CVDChoose the TiCN/Al2O3/TiN coating on this tough substrate to raise wear resistance and permissible cutting speed in rough machining of steel.2,600 HV
Working with ТТ7К12-CVD
Is ТТ7К12 easy to machine?
Shaping after sintering is limited to diamond wheel grinding, EDM or laser machining; conventional cutting tools cannot be used, and grinding needs generous coolant to avoid thermal cracking.
Can ТТ7К12 be welded?
Not fusion weldable; braze to steel bodies with silver-copper fillers (Ag-Cu-Zn, BAg-1) by vacuum or induction brazing, controlling the heating rate to limit thermal stress.
Can ТТ7К12 be formed, bent or molded?
Powder pressing or extrusion followed by vacuum liquid-phase sintering at about 1450 °C; linear shrinkage is roughly 18–20% and compacts must be sized for it.
What surface finishes work on ТТ7К12?
Diamond lapping and polishing gives a mirror finish; CVD/PVD coatings (TiCN, Al₂O₃, TiAlN) increase wear resistance. Electroplating and anodising are not applicable.
ТТ7К12 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cobinder phase | 11 – 13 | 12 |
| TiCTiC + TaC total about 7 % | 3 – 5 | 4 |
| TaCincludes a small amount of NbC | 2 – 4 | 3 |
| WC | balance | — |
ТТ7К12-CVD — frequently asked
What is ТТ7К12-CVD used for?
ТТ7К12-CVD is typically used for heavy roughing of steel/forgings, impact-resistant tooling and mining and construction tools. In short: toughest steel-cutting carbide; triple-carbide shock grade; roughing over speed.
What is the tensile strength of ТТ7К12-CVD?
ТТ7К12-CVD has a typical tensile strength of 1,150 MPa (167 ksi) — stronger than 90% of ceramic grades. Strength varies by condition: see the 3 listed tempers.
Is ТТ7К12-CVD easy to machine?
Not especially — machinability is rated not recommended (5/100, worse than 58% of ceramic grades). Shaping after sintering is limited to diamond wheel grinding, EDM or laser machining; conventional cutting tools cannot be used, and grinding needs generous coolant to avoid thermal cracking.
Can ТТ7К12-CVD be welded?
Not fusion weldable; braze to steel bodies with silver-copper fillers (Ag-Cu-Zn, BAg-1) by vacuum or induction brazing, controlling the heating rate to limit thermal stress.
What surface finishes work on ТТ7К12-CVD?
Diamond lapping and polishing gives a mirror finish; CVD/PVD coatings (TiCN, Al₂O₃, TiAlN) increase wear resistance. Electroplating and anodising are not applicable.
Can ТТ7К12-CVD be formed, bent or molded?
Powder pressing or extrusion followed by vacuum liquid-phase sintering at about 1450 °C; linear shrinkage is roughly 18–20% and compacts must be sized for it.
What is the maximum service temperature of ТТ7К12-CVD?
ТТ7К12-CVD is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ГОСТ 3882 Сплавы твердые спеченные — марки — Госстандарт (1974)
- ASM Handbook Vol. 2 — Properties of Cemented Carbides — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.