Copper Alloy C36700
UNS C36700 · ASTM B121
C36700 is a medium-lead Muntz metal, an alpha–beta 60/40 copper–zinc brass covered by ASTM B121 and stocked in M20, M25, M30, O61, H01 and H02 tempers.
Reference datasheet — C36700 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the M20 condition
C36700 tempers and conditions
C36700 is supplied in 6 conditions, soft to hard. M20 is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Use when maximum ductility for bending, expanding or rolling-in of tubes is needed. | 125 | 360 | 50 | 90 HB | 28 % IACS |
As hot extruded | Pick for extruded bar, architectural shapes and forging stock where machining follows. | 140 | 370 | 48 | 100 HB | 28 % IACS |
As hot forged and air cooled | Condition of hot-forged valve bodies and hardware bodies straight off the press. | 140 | 370 | 45 | 100 HB | 28 % IACS |
M20Default As hot rolled | Standard condition for ASTM B171 condenser tube sheets and heavy plate; best combination of strength and machinability. | 145 | 380 | 45 | 105 HB | 28 % IACS |
Quarter hard | Light cold work for higher yield strength in flat products while keeping some bendability. | 275 | 425 | 25 | 125 HB | 27 % IACS |
Half hard | Choose for straight, stiff bar and strip needing the highest strength available in this alloy. | 345 | 470 | 18 | 145 HB | 27 % IACS |
What is C36700?
C36700 is a medium-lead Muntz metal, an alpha–beta 60/40 copper–zinc brass covered by ASTM B121 and stocked in M20, M25, M30, O61, H01 and H02 tempers. It balances free-machining performance — roughly 60% of C36000 — with 60/40 brass strength: 380 MPa tensile, 145 MPa yield, 45% elongation, 105 HB and 28% IACS conductivity. Lead rules out arc and gas welding, and the beta phase limits cold work; C36800 offers higher machinability, while C36600 is the lower-lead option. C36700 has a density of 8.41 g/cm³ (0.304 lb/in³), lighter than 72% of copper alloy grades. It melts at 885°C (1,625 °F). C36700 has a yield strength of 145 MPa (21 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 72% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 103 GPa (14.9 Msi).
What is C36700 used for?
- Architectural fittings
- Valve components
- Decorative extrusions
Advantages
- Ductile — tolerates forming and impact — 45%, better than 91% of copper alloy grades
Limitations
- Needs corrosion protection — 48/100, worse than 96% of copper alloy grades
- Difficult to weld — 25/100, worse than 78% of copper alloy grades
C36700 properties
Typical room-temperature values for C36700-M20; bars are the position among copper alloy grades.
Physical3
C36700 has a density of 8.41 g/cm³ (0.304 lb/in³), lighter than 72% of copper alloy grades. It melts at 885°C (1,625 °F).
Mechanical15
C36700 has a yield strength of 145 MPa (21 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 72% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C36700 is rated for continuous service to 200°C (392 °F). It conducts heat at 123 W/m·K (71.1 BTU/hr·ft·°F), better than 70% of copper alloy grades. Thermal expansion is 20.8 µm/m·K (11.6 µin/in·°F).
Electrical3
C36700 conducts electricity at 28 % IACS, better than 69% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (48/100), worse than 96% of copper alloy grades.
Sustainability4
Producing a kilogram of C36700 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
C36700's machinability is good (60/100, better than 74% of copper alloy grades); weldability poor (25/100); formability fair (40/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C36700 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C36700
Is C36700 easy to machine?
Free-cutting at ~60 % of C36000 — use sharp, high-rake carbide or HSS tools, light feeds and flood coolant; chips break well thanks to the lead.
Can C36700 be welded?
Arc and gas welding are not recommended (lead cracking, zinc fume); join by soft soldering or silver brazing with good ventilation.
Can C36700 be formed, bent or molded?
Excellent hot working at 620–760 °C (forging, extrusion, hot rolling); cold formability is limited by the β phase — anneal at 425–600 °C between severe operations.
C36700 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 |
|---|---|---|
| Cuincludes Ag when reported | 58 – 61 | 59.5 |
| Pbfree-machining addition | 0.25 – 0.7 | 0.5 |
| Fe | ≤ 0.15 | 0.05 |
| Sbdezincification inhibitor (antimonial grade) | 0.02 – 0.1 | 0.05 |
| Zn≈ 39–41 % | balance |
What surface finishes work on C36700?
Takes a bright mechanical polish and standard brass lacquer, chromate or Ni/Cr plating; stress-relieve at ~275 °C before service in ammonia-bearing atmospheres.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy C36700 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B121
How much does C36700 cost?
C36700 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C36700 — frequently asked
What is C36700 used for?
C36700 is typically used for architectural fittings, valve components and decorative extrusions. In short: mid-lead Muntz metal; free-cutting 60/40 brass; good hot forging alloy.
What is the yield strength of C36700?
C36700 has a typical yield strength of 145 MPa (21 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 72% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C36700 easy to machine?
Reasonably — machinability is rated good (60/100, better than 74% of copper alloy grades). Free-cutting at ~60 % of C36000 — use sharp, high-rake carbide or HSS tools, light feeds and flood coolant; chips break well thanks to the lead.
Can C36700 be welded?
Not readily — weldability is rated poor (25/100). Arc and gas welding are not recommended (lead cracking, zinc fume); join by soft soldering or silver brazing with good ventilation.
What surface finishes work on C36700?
Takes a bright mechanical polish and standard brass lacquer, chromate or Ni/Cr plating; stress-relieve at ~275 °C before service in ammonia-bearing atmospheres.
Can C36700 be formed, bent or molded?
Excellent hot working at 620–760 °C (forging, extrusion, hot rolling); cold formability is limited by the β phase — anneal at 425–600 °C between severe operations.
What is the maximum service temperature of C36700?
C36700 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 C36700-M20 and C36700-H02?
M20 is the default condition — standard condition for ASTM B171 condenser tube sheets and heavy plate; best combination of strength and machinability. H02: choose for straight, stiff bar and strip needing the highest strength available in this alloy. Yield strength is 145 MPa in M20 versus 345 MPa in H02.
How much does C36700 cost?
C36700 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM B171/B171M — Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers and Heat Exchangers — ASTM International (2018)
- ASTM B121/B121M — Leaded Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2020)
- CDA Alloy Database, C36500–C36800 leaded Muntz metal — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (copper alloys) — ASM International (2005)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.