Copper Alloy C42200-H03
Supply condition
UNS C42200
H03 = three-quarter hard
Intermediate spring temper when H02 lacks contact force but H04 cracks on the required bend radius.
Values for the H03 condition
Other C42200 tempers and conditions
C42200 is listed in 9 conditions; see the grade overview at C42200.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed to 0.035 mm grain size | Softest commercial strip temper — pick for deep drawing or severe forming where strength is developed later. | 110 | 300 | 48 | 60 HB | 28 % IACS |
Annealed to 0.015 mm grain size | Fine-grain anneal for good formability with a smoother surface after forming (less orange peel) and slightly higher strength. | 140 | 325 | 42 | 72 HB | 28 % IACS |
Quarter hard | Choose when parts need moderate stiffness but still see bending over small radii across the grain. | 275 | 360 | 28 | 108 HB | 28 % IACS |
H02Default Half hard | Default stocked strip temper: best all-round balance of spring strength and bend formability for stamped terminals. | 359 | 414 | 12 | 130 HB | 28 % IACS |
H03This page Three-quarter hard | Intermediate spring temper when H02 lacks contact force but H04 cracks on the required bend radius. | 400 | 450 | 8 | 140 HB | 28 % IACS |
Full hard | Standard spring-contact temper: high yield strength with bends limited to generous radii, usually with grain direction. | 450 | 490 | 5 | 150 HB | 28 % IACS |
Extra hard | For flat spring elements with minimal forming — high strength, very limited transverse bending. | 495 | 538 | 3 | 162 HB | 28 % IACS |
Spring hard | Spring temper for contact fingers and clips needing high, stable contact force; stress relieve after forming. | 530 | 572 | 3 | 172 HB | 28 % IACS |
Extra spring hard | Maximum-strength strip for flat springs and thin contacts where essentially no forming is required. | 555 | 595 | 2 | 180 HB | 28 % IACS |
What is C42200-H03?
C42200-H03 is C42200 supplied in the H03 condition — intermediate spring temper when H02 lacks contact force but H04 cracks on the required bend radius. C42200-H03 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 80% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 110 GPa (16 Msi). C42200-H03 has a density of 8.78 g/cm³ (0.317 lb/in³), heavier than 53% of copper alloy grades. It melts at 1,004°C (1,839 °F). H02 is the default condition FabDigit quotes; H03 is available on request or by drawing note.
Advantages
- High strength — 400 MPa (58 ksi), better than 80% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Limited ductility — 8%, worse than 83% of copper alloy grades
C42200-H03 properties
Typical room-temperature values for C42200-H03; 12 are specific to this condition. Other listed values are C42200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C42200-H03 has a density of 8.78 g/cm³ (0.317 lb/in³), heavier than 53% of copper alloy grades. It melts at 1,004°C (1,839 °F).
Mechanical12
C42200-H03 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 80% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C42200-H03 is rated for continuous service to 150°C (302 °F). It conducts heat at 113 W/m·K (65.3 BTU/hr·ft·°F), better than 60% of copper alloy grades. Thermal expansion is 18.4 µm/m·K (10.2 µin/in·°F).
Electrical3
C42200-H03 conducts electricity at 28 % IACS, better than 69% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C42200-H03 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C42200-H03's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability fair (45/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C42200-H03
Is C42200 easy to machine?
Gummy, non-free-cutting brass (~30 % of C36000): use sharp positive-rake tools, high speed, light feeds and good lubrication; expect long chips.
Can C42200 be welded?
Excellent soft-soldering and good brazing/resistance welding; avoid arc/gas fusion welding because of zinc fume and loss of temper.
Can C42200 be formed, bent or molded?
Anneal or H01–H02 tempers stamp and deep-draw well; in H04 and harder bend with the grain, allow generous radii, and stress relieve (≈200–260 °C) formed springs to avoid SCC and relaxation.
What surface finishes work on C42200?
Takes bright polishing and standard tin, nickel, silver or gold electroplating for contacts; not anodizable — protect bare surfaces with lacquer or tarnish inhibitor.
C42200 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 |
|---|---|---|
| CuAg may be counted as Cu | 86 – 89 | 87.5 |
| Sn | 0.8 – 1.4 | 1.1 |
| Pdeoxidizer residual | ≤ 0.35 | 0.03 |
| Pbimpurity limit | ≤ 0.05 | — |
| Feimpurity limit | ≤ 0.05 | — |
| Zn | balance | — |
C42200-H03 — frequently asked
What is C42200-H03 used for?
C42200-H03 is typically used for springs, connectors and terminals. In short: most formable tin brass; spring-temper contact strip; non free-cutting alloy.
What is the yield strength of C42200-H03?
C42200-H03 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 80% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C42200-H03 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Gummy, non-free-cutting brass (~30 % of C36000): use sharp positive-rake tools, high speed, light feeds and good lubrication; expect long chips.
Can C42200-H03 be welded?
With care — weldability is rated fair (45/100). Excellent soft-soldering and good brazing/resistance welding; avoid arc/gas fusion welding because of zinc fume and loss of temper.
What surface finishes work on C42200-H03?
Takes bright polishing and standard tin, nickel, silver or gold electroplating for contacts; not anodizable — protect bare surfaces with lacquer or tarnish inhibitor.
Can C42200-H03 be formed, bent or molded?
Anneal or H01–H02 tempers stamp and deep-draw well; in H04 and harder bend with the grain, allow generous radii, and stress relieve (≈200–260 °C) formed springs to avoid SCC and relaxation.
What is the maximum service temperature of C42200-H03?
C42200-H03 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C42200-H02 and C42200-OS035?
H02 is the default condition — default stocked strip temper: best all-round balance of spring strength and bend formability for stamped terminals. OS035: softest commercial strip temper — pick for deep drawing or severe forming where strength is developed later. Yield strength is 359 MPa in H02 versus 110 MPa in OS035.
Sources
- ASTM B591 — Copper-Zinc-Tin Alloy Plate, Sheet, Strip and Rolled Bar — ASTM International (2022)
- ASTM B36/B36M — Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2018)
- CDA/copper.org Alloy Database — C42200 — Copper Development Association (2024)
- ASM Handbook Vol. 2 — Properties of Copper and Copper 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.