Copper Alloy C18200-HR50
Supply condition
UNS C18200 · ASTM B624 · EN CuCr1, CW105C · JIS C1820
HR50 = cold worked and stress-relieved rod/wire
Drawn and stress-relieved condition for straight, dimensionally stable rod and wire where full aging response is not specified.
Values for the HR50 condition
Other C18200 tempers and conditions
C18200 is listed in 8 conditions; see the grade overview at C18200.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution heat treated | Pick when heavy cold forming, deep drawing or machining of complex shapes is needed before a final aging cycle. | 96 | 234 | 40 | 55 HB | 42 % IACS |
Solution heat treated and cold worked, full hard | Cold-worked strength without the aging step; choose when conductivity is secondary and a later age-hardening cycle will follow. | 360 | 400 | 12 | 120 HB | 45 % IACS |
Solution heat treated and precipitation hardened | Best choice for large sections, forgings and mould inserts where uniform properties and high conductivity matter more than peak strength. | 372 | 448 | 22 | 120 HB | 82 % IACS |
TD01 and precipitation hardened | Moderate cold work plus aging: good balance of formed-part strength and conductivity in strip/rod. | 400 | 476 | 20 | 130 HB | 82 % IACS |
HR50This page Cold worked and stress-relieved rod/wire | Drawn and stress-relieved condition for straight, dimensionally stable rod and wire where full aging response is not specified. | 410 | 470 | 14 | 130 HB | 78 % IACS |
TD02 and precipitation hardened | Half-hard + aged temper for switch arms, holders and contact supports needing spring-like stiffness with high conductivity. | 427 | 496 | 18 | 140 HB | 82 % IACS |
HDefault Hardened | Standard stocked condition for electrode bar and rod: ~75–80 HRB with ≥80% IACS. | 430 | 500 | 18 | 140 HB | 82 % IACS |
TD04 and precipitation hardened | Highest strength/hardness combination for resistance-welding electrodes, shanks and heavy-duty conductors. | 448 | 517 | 16 | 145 HB | 81 % IACS |
What is C18200-HR50?
C18200-HR50 is C18200 supplied in the HR50 condition — drawn and stress-relieved condition for straight, dimensionally stable rod and wire where full aging response is not specified. C18200-HR50 has a yield strength of 410 MPa (59.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 81% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 117 GPa (17 Msi). C18200-HR50 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,070°C (1,958 °F). H is the default condition FabDigit quotes; HR50 is available on request or by drawing note.
Advantages
- High service temperature — 350°C (662 °F), better than 95% of copper alloy grades
- Conducts heat well — 310 W/m·K (179.1 BTU/hr·ft·°F), better than 83% of copper alloy grades
- High electrical conductivity — 78 % IACS, better than 83% of copper alloy grades
- High strength — 410 MPa (59.5 ksi), better than 81% of copper alloy grades
C18200-HR50 properties
Typical room-temperature values for C18200-HR50; 21 are specific to this condition. Other listed values are C18200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C18200-HR50 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,070°C (1,958 °F).
Mechanical12
C18200-HR50 has a yield strength of 410 MPa (59.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 81% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C18200-HR50 is rated for continuous service to 350°C (662 °F). It conducts heat at 310 W/m·K (179.1 BTU/hr·ft·°F), better than 83% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C18200-HR50 conducts electricity at 78 % IACS, better than 83% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C18200-HR50 takes about 57 MJ of energy and emits 3.5 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 30%.
Manufacturability7
C18200-HR50's machinability is fair (40/100, better than 57% of copper alloy grades); weldability poor (30/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C18200-HR50
Is C18200 easy to machine?
Machine in the aged (TH/TF) condition with sharp positive-rake carbide, high speed and generous coolant; gummy and prone to built-up edge when solution treated.
Can C18200 be welded?
Fusion welding is poor — Cr oxide films and hot cracking; prefer brazing, silver soldering or mechanical/threaded joints, and re-age locally softened zones.
Can C18200 be formed, bent or molded?
Form, bend or upset in TB00 (soft) condition then age 450–500 °C for 2–4 h; cold formability drops sharply once aged.
What surface finishes work on C18200?
Not anodizable; use bright turning/polishing, chemical bright dip, or nickel/silver/tin plating for contact surfaces and tarnish resistance.
C18200 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 |
|---|---|---|
| Crprimary precipitation-hardening addition | 0.6 – 1.2 | 0.9 |
| Feimpurity limit | ≤ 0.1 | 0.03 |
| Siimpurity limit | ≤ 0.1 | 0.02 |
| Pbimpurity limit | ≤ 0.05 | 0.01 |
| CuCu + named elements ≥ 99.5 % (Ag countable as Cu) | ≥ 98.6 (balance) | — |
C18200-HR50 — frequently asked
What is C18200-HR50 used for?
C18200-HR50 is typically used for resistance spot-welding electrodes (RWMA Class 2), electrode holders and shanks, switch and breaker contact arms, continuous-casting mould components, injection mould inserts and high-current bus conductors. In short: high-temp conductivity.
What is the yield strength of C18200-HR50?
C18200-HR50 has a typical yield strength of 410 MPa (59.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 81% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C18200-HR50 easy to machine?
Not especially — machinability is rated fair (40/100, better than 57% of copper alloy grades). Machine in the aged (TH/TF) condition with sharp positive-rake carbide, high speed and generous coolant; gummy and prone to built-up edge when solution treated.
Can C18200-HR50 be welded?
Not readily — weldability is rated poor (30/100). Fusion welding is poor — Cr oxide films and hot cracking; prefer brazing, silver soldering or mechanical/threaded joints, and re-age locally softened zones.
What surface finishes work on C18200-HR50?
Not anodizable; use bright turning/polishing, chemical bright dip, or nickel/silver/tin plating for contact surfaces and tarnish resistance.
Can C18200-HR50 be formed, bent or molded?
Form, bend or upset in TB00 (soft) condition then age 450–500 °C for 2–4 h; cold formability drops sharply once aged.
What is the maximum service temperature of C18200-HR50?
C18200-HR50 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C18200-H and C18200-TB00?
H is the default condition — standard stocked condition for electrode bar and rod: ~75–80 HRB with ≥80% IACS. TB00: pick when heavy cold forming, deep drawing or machining of complex shapes is needed before a final aging cycle. Yield strength is 430 MPa in H versus 96 MPa in TB00.
Can FabDigit make parts in C18200-HR50?
Yes — C18200-HR50 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 B224 — Standard Classification of Coppers — ASTM International (2021)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- RWMA Bulletin 16 — Resistance Welding Electrode Classification (Class 2) — AWS/RWMA (2017)
- UNS C18200 alloy datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol.2 — Properties of 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.