Copper Alloy C17200-TM05
Precip hard
UNS C17200 · EN CuBe2, CW101C · JIS C1720 · GB TBe2
TM05 = sHM
Higher spring force for miniature contacts where bends are gentle.
Values for the TM05 condition
Other C17200 tempers and conditions
C17200 is listed in 16 conditions; see the grade overview at C17200.
Compare all 16 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | Softest, most formable condition — stamp/deep-draw/machine first, then age to full strength. | 260 | 490 | 45 | 105 HB | 17 % IACS |
Solution heat treated and cold worked, quarter hard | Light cold work before aging — higher pre-age stiffness with usable bend formability. | 480 | 560 | 28 | 150 HB | 17 % IACS |
Mill hardened | Mill-hardened strip: formable and already aged — no in-house heat treatment or distortion control needed. | 570 | 760 | 22 | 220 HB | 24 % IACS |
Solution heat treated and cold worked, half hard | Medium cold work for parts needing more spring-back before precipitation hardening. | 585 | 640 | 15 | 190 HB | 17 % IACS |
1/4 HM | Mill-hardened level with good bendability for connector contacts. | 670 | 825 | 17 | 24 HRC | 24 % IACS |
Solution heat treated and cold worked, full hard | Maximum cold work before aging; gives the highest attainable aged strength (HT). | 690 | 760 | 5 | 225 HB | 17 % IACS |
Mill hardened, half hard | Balanced mill-hardened temper for stamped springs with moderate bends. | 775 | 895 | 14 | 27 HRC | 24 % IACS |
Mill hardened, full hard | Common connector-spring temper: high strength with adequate 90° bend capability. | 845 | 965 | 11 | 30 HRC | 24 % IACS |
TM05This page SHM | Higher spring force for miniature contacts where bends are gentle. | 930 | 1,035 | 9 | 32 HRC | 24 % IACS |
Mill hardened, extra hard | Near-maximum mill-hardened strength for flat springs with large bend radii. | 1,000 | 1,105 | 7 | 34 HRC | 24 % IACS |
Solution heat treated and precipitation hardened | Condition A material precipitation-aged (~315 °C/2–3 h) to peak strength with no prior cold work — full hardness with the best dimensional stability and isotropy of the aged tempers. | 1,070 | 1,210 | 6 | 39 HRC | 23 % IACS |
Mill hardened, spring hard | Highest mill-hardened level offered; choose only when in-house aging is impossible and bends are minimal. | 1,070 | 1,170 | 5 | 36 HRC | 24 % IACS |
Hardened | Standard fully hardened condition for springs, moulds and non-sparking tools when formed or machined from condition A. | 1,100 | 1,240 | 6 | 39 HRC | 22 % IACS |
TD01 and precipitation hardened | Cold worked then aged; higher strength than AT with slightly lower ductility. | 1,140 | 1,275 | 4 | 41 HRC | 22 % IACS |
TD02 and precipitation hardened | Higher-strength aged strip/rod for heavily loaded contacts and springs of simple shape. | 1,170 | 1,310 | 3 | 42 HRC | 22 % IACS |
TD04 and precipitation hardened | Peak strength/hardness of the alloy family — flat parts, bushings, wear surfaces; very limited formability. | 1,240 | 1,380 | 2 | 43 HRC | 22 % IACS |
What is C17200-TM05?
C17200-TM05 is C17200 in the TM05 condition — higher spring force for miniature contacts where bends are gentle. C17200-TM05 has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,035 MPa (150 ksi) — stronger than 98% of copper alloy grades. Elongation at break is 9% and the elastic modulus is 130 GPa (18.9 Msi). C17200-TM05 has a density of 8.26 g/cm³ (0.298 lb/in³), lighter than 83% of copper alloy grades. It melts at 865°C (1,589 °F). A is the default condition FabDigit quotes; TM05 is available on request or by drawing note.
Advantages
- High strength — 930 MPa (135 ksi), better than 98% of copper alloy grades
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
- Stiff — 130 GPa (18.9 Msi), better than 89% of copper alloy grades
Limitations
- High embodied carbon — 6.5 kg CO₂/kg, worse than 94% of copper alloy grades
- Limited ductility — 9%, worse than 79% of copper alloy grades
C17200-TM05 properties
Typical room-temperature values for C17200-TM05; 21 are specific to this condition. Other listed values are C17200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C17200-TM05 has a density of 8.26 g/cm³ (0.298 lb/in³), lighter than 83% of copper alloy grades. It melts at 865°C (1,589 °F).
Mechanical13
C17200-TM05 has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,035 MPa (150 ksi) — stronger than 98% of copper alloy grades. Elongation at break is 9% and the elastic modulus is 130 GPa (18.9 Msi).
Thermal6
C17200-TM05 is rated for continuous service to 200°C (392 °F). It conducts heat at 118 W/m·K (68.2 BTU/hr·ft·°F), better than 65% of copper alloy grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
C17200-TM05 conducts electricity at 24 % IACS, better than 57% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C17200-TM05 takes about 95 MJ of energy and emits 6.5 kg of CO₂ — more than 95% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C17200-TM05's machinability is fair (50/100, better than 69% of copper alloy grades); weldability fair (45/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C17200-TM05
Is C17200 easy to machine?
Machine in condition A with sharp positive-rake tools and flood coolant (gummy, chips smear); finish-machine in the aged state where tolerance matters — always capture Be-containing dust with wet cutting/HEPA extraction.
Can C17200 be welded?
Resistance and electron-beam welding are good; GTAW is possible with C17200 filler under argon but the HAZ over-ages — re-age the assembly at ~315 °C afterwards and control beryllium fume.
Can C17200 be formed, bent or molded?
Form, coil, draw and stamp in condition A (bend radii down to ~1t); age 2–3 h at 315 °C (or 2 h at 340 °C for cold-worked stock) with fixturing to control the ~0.2 % growth/distortion.
What surface finishes work on C17200?
Takes mirror polishing and electroless-nickel, nickel or gold plating well; no anodizing — pickle in dilute sulphuric/hydrogen-peroxide to remove the tenacious beryllium oxide before plating or brazing.
C17200 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 |
|---|---|---|
| Beprimary hardening element | 1.8 – 2 | 1.9 |
| Co+Ni0.20 % minimum sum | ≥ 0.2 | 0.3 |
| Co+Ni+Fe0.6 % maximum sum | ≤ 0.6 | — |
| Pbimpurity limit (C17300 is the leaded free-machining version) | ≤ 0.2 | — |
| CuCu + named elements 99.5 % min | balance | — |
C17200-TM05 — frequently asked
What is C17200-TM05 used for?
C17200-TM05 is typically used for precision springs and diaphragms, connector and switch contact springs, injection mould inserts and core pins, non-sparking and downhole tools, bellows and flexible seals and bushings and heavy-load bearings. In short: highest strength copper alloy.
What is the yield strength of C17200-TM05?
C17200-TM05 has a typical yield strength of 930 MPa (135 ksi) and a tensile strength of 1,035 MPa (150 ksi) — stronger than 98% of copper alloy grades. Strength varies by condition: see the 16 listed tempers.
Is C17200-TM05 easy to machine?
Reasonably — machinability is rated fair (50/100, better than 69% of copper alloy grades). Machine in condition A with sharp positive-rake tools and flood coolant (gummy, chips smear); finish-machine in the aged state where tolerance matters — always capture Be-containing dust with wet cutting/HEPA extraction.
Can C17200-TM05 be welded?
With care — weldability is rated fair (45/100). Resistance and electron-beam welding are good; GTAW is possible with C17200 filler under argon but the HAZ over-ages — re-age the assembly at ~315 °C afterwards and control beryllium fume.
What surface finishes work on C17200-TM05?
Takes mirror polishing and electroless-nickel, nickel or gold plating well; no anodizing — pickle in dilute sulphuric/hydrogen-peroxide to remove the tenacious beryllium oxide before plating or brazing.
Can C17200-TM05 be formed, bent or molded?
Form, coil, draw and stamp in condition A (bend radii down to ~1t); age 2–3 h at 315 °C (or 2 h at 340 °C for cold-worked stock) with fixturing to control the ~0.2 % growth/distortion.
What is the maximum service temperature of C17200-TM05?
C17200-TM05 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C17200-A and C17200-TH04?
A is the default condition — softest, most formable condition — stamp/deep-draw/machine first, then age to full strength. TH04: peak strength/hardness of the alloy family — flat parts, bushings, wear surfaces; very limited formability. Yield strength is 260 MPa in A versus 1,240 MPa in TH04.
Can FabDigit make parts in C17200-TM05?
Yes — C17200-TM05 is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B194 — Copper-Beryllium Alloy Plate, Sheet, Strip and Rolled Bar — ASTM International (2020)
- ASTM B196 — Copper-Beryllium Alloy Rod and Bar — ASTM International (2018)
- Alloy 25 (C17200) Technical Datasheet — Materion Brush Performance Alloys (2021)
- CDA Alloy Database — C17200 — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — 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.