Copper Alloy C33200-OS050
Temper
UNS C33200
OS050 = annealed to 0.050 mm grain size
Softest coarse-grain anneal — pick it for maximum deep-bend/expansion ductility.
Values for the OS050 condition
Other C33200 tempers and conditions
C33200 is listed in 7 conditions; see the grade overview at C33200.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OS050This page Annealed to 0.050 mm grain size | Softest coarse-grain anneal — pick it for maximum deep-bend/expansion ductility. | 105 | 310 | 60 | 60 HB | 27 % IACS |
Annealed to 0.025 mm grain size | Standard soft tube temper when the part is bent, flared or expanded before/after machining. | 110 | 325 | 55 | 65 HB | 27 % IACS |
Annealed to 0.015 mm grain size | Finest-grain annealed tube for light forming plus best surface finish after machining. | 125 | 345 | 50 | 70 HB | 27 % IACS |
Light drawn | Lightly drawn tube giving tight dimensions with much of the annealed ductility retained. | 240 | 380 | 30 | 95 HB | 26 % IACS |
Drawn, general purpose | General-purpose drawn tube: best compromise of strength, straightness and machining behaviour. | 290 | 415 | 22 | 110 HB | 26 % IACS |
Full hard | Full-hard cold-worked stock for maximum strength/stiffness where no further forming is needed. | 370 | 470 | 12 | 130 HB | — |
H80Default Hard drawn | Most commonly stocked screw-machine tube temper: highest as-drawn strength with short, clean chips. | 415 | 515 | 7 | 140 HB | — |
What is C33200-OS050?
C33200-OS050 is C33200 in the OS050 temper — softest coarse-grain anneal — pick it for maximum deep-bend/expansion ductility. C33200-OS050 has a yield strength of 105 MPa (15.2 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 85% of copper alloy grades. Elongation at break is 60% and the elastic modulus is 103 GPa (14.9 Msi). C33200-OS050 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 899°C (1,650 °F). H80 is the default condition FabDigit quotes; OS050 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 60%, better than 99% of copper alloy grades
- Easy to machine — 73/100, better than 80% of copper alloy grades
- Forms and bends easily — 70/100, better than 80% of copper alloy grades
Limitations
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Low strength — 105 MPa (15.2 ksi), worse than 85% of copper alloy grades
C33200-OS050 properties
Typical room-temperature values for C33200-OS050; 20 are specific to this condition. Other listed values are C33200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C33200-OS050 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 899°C (1,650 °F).
Mechanical11
C33200-OS050 has a yield strength of 105 MPa (15.2 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 85% of copper alloy grades. Elongation at break is 60% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C33200-OS050 is rated for continuous service to 200°C (392 °F). It conducts heat at 116 W/m·K (67 BTU/hr·ft·°F), better than 64% of copper alloy grades. Thermal expansion is 20.2 µm/m·K (11.2 µin/in·°F).
Electrical3
C33200-OS050 conducts electricity at 27 % IACS, better than 67% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C33200-OS050 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 70%.
Manufacturability7
C33200-OS050's machinability is very good (73/100, better than 80% of copper alloy grades); weldability poor (20/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C33200-OS050
Is C33200 easy to machine?
Excellent free-cutting behaviour (≈80 % of C36000); use high speeds, zero-to-negative rake brass tooling and light emulsion or dry cutting.
Can C33200 be welded?
Not recommended for fusion welding (lead causes hot cracking); join by soft soldering or silver brazing with low heat input.
Can C33200 be formed, bent or molded?
Cold form only in OS tempers and with generous radii; avoid hot working above ~600 °C because of lead hot-shortness.
What surface finishes work on C33200?
Takes bright dipping, tumbling and buffing well; nickel/chrome or tin plating standard — no anodizing, and stress-relieve to avoid SCC before plating.
C33200 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 |
|---|---|---|
| CuASTM B135 C33200 | 65 – 68 | 66.5 |
| Pbfree-machining addition | 1.5 – 2.5 | 2 |
| Fe | ≤ 0.07 | — |
| Zn | balance | — |
C33200-OS050 — frequently asked
What is C33200-OS050 used for?
C33200-OS050 is typically used for screw machine parts, small precision fittings and hardware. In short: free-cutting leaded tube; 80% of C36000 machinability; high-strength hard temper.
What is the yield strength of C33200-OS050?
C33200-OS050 has a typical yield strength of 105 MPa (15.2 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 85% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C33200-OS050 easy to machine?
Yes — machinability is rated very good (73/100, better than 80% of copper alloy grades). Excellent free-cutting behaviour (≈80 % of C36000); use high speeds, zero-to-negative rake brass tooling and light emulsion or dry cutting.
Can C33200-OS050 be welded?
Not readily — weldability is rated poor (20/100). Not recommended for fusion welding (lead causes hot cracking); join by soft soldering or silver brazing with low heat input.
What surface finishes work on C33200-OS050?
Takes bright dipping, tumbling and buffing well; nickel/chrome or tin plating standard — no anodizing, and stress-relieve to avoid SCC before plating.
Can C33200-OS050 be formed, bent or molded?
Cold form only in OS tempers and with generous radii; avoid hot working above ~600 °C because of lead hot-shortness.
What is the maximum service temperature of C33200-OS050?
C33200-OS050 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 C33200-H80 and C33200-OS050?
H80 is the default condition — most commonly stocked screw-machine tube temper: highest as-drawn strength with short, clean chips. OS050: softest coarse-grain anneal — pick it for maximum deep-bend/expansion ductility. Yield strength is 415 MPa in H80 versus 105 MPa in OS050.
Sources
- ASTM B135 — Seamless Brass Tube — ASTM International (2017)
- ASTM B36/B587 (related leaded brass product forms) — ASTM International (2018)
- CDA Alloy Database — C33200 High-Leaded Brass Tube — 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.