Copper Alloy C46400-M30
Temper
UNS C46400 · ASTM B21 · EN CuZn39Sn, CW712R · JIS C4641, C4640 · GB HSn62, HSn62-1
M30 = as hot extruded
Most economical rod/section condition; good strength with easy subsequent hot forging.
Values for the M30 condition
Other C46400 tempers and conditions
C46400 is listed in 12 conditions; see the grade overview at C46400.
Compare all 12 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Fully soft-annealed naval brass — lowest strength and hardness with maximum ductility for deep forming, bending and subsequent cold work. | 150 | 370 | 50 | 78 HB | 26 % IACS |
As hot forged and air cooled | Hot-forged naval brass cooled in still air — duplex α+β structure with moderate strength and high ductility, typical of marine forgings and valve bodies. | 170 | 390 | 40 | 95 HB | 26 % IACS |
ODefault Annealed | Pick for maximum ductility: cold bending, forming, spinning and welded fabrications. | 172 | 380 | 48 | 95 HB | 26 % IACS |
As hot rolled | Standard mill condition for naval brass plate used in tube sheets and marine flanges. | 180 | 400 | 40 | 110 HB | 26 % IACS |
Light annealed | Lightly annealed condition — grain structure partly recrystallised for a compromise between the forming ductility of a full anneal and slightly higher strength. | 180 | 400 | 42 | 90 HB | 26 % IACS |
As forged and quenched | Hot-forged naval brass water-quenched from forging heat — retained beta phase gives slightly higher strength and hardness than air cooling with modest loss of ductility. | 190 | 415 | 35 | 110 HB | 26 % IACS |
M30This page As hot extruded | Most economical rod/section condition; good strength with easy subsequent hot forging. | 190 | 415 | 40 | 115 HB | 26 % IACS |
Quarter hard | Use when moderate strength must be combined with residual bending ductility. | 205 | 420 | 40 | 115 HB | 26 % IACS |
Half hard | Workhorse condition for marine shafting, valve stems and machined fittings — best strength/machining balance. | 235 | 450 | 33 | 120 HB | 26 % IACS |
Extruded and Drawn | Hot-extruded rod finished by a cold draw pass — the standard naval-brass bar temper with raised yield strength and good straightness/tolerance. | 300 | 470 | 25 | 135 HB | 26 % IACS |
Full hard | Choose for maximum strength and wear resistance where forming is no longer required. | 380 | 550 | 17 | 150 HB | 25 % IACS |
Extra hard | Wire/strip temper for springy marine fasteners and mesh; very limited ductility. | 450 | 620 | 8 | 165 HB | 25 % IACS |
What is C46400-M30?
C46400-M30 is C46400 in the M30 temper — most economical rod/section condition; good strength with easy subsequent hot forging. C46400-M30 has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 57% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 100 GPa (14.5 Msi). C46400-M30 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). O is the default condition FabDigit quotes; M30 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 40%, better than 84% of copper alloy grades
Limitations
- Low stiffness — 100 GPa (14.5 Msi), worse than 82% of copper alloy grades
C46400-M30 properties
Typical room-temperature values for C46400-M30; 20 are specific to this condition. Other listed values are C46400 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C46400-M30 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).
Mechanical14
C46400-M30 has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 57% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
C46400-M30 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 21.2 µm/m·K (11.8 µin/in·°F).
Electrical3
C46400-M30 conducts electricity at 26 % IACS, better than 63% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C46400-M30 takes about 60 MJ of energy and emits 3.8 kg of CO₂ — more than 69% of copper alloy grades. Typical recycled content is 50%.
Manufacturability8
C46400-M30's machinability is fair (35/100, better than 51% of copper alloy grades); weldability fair (45/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C46400-M30
Is C46400 easy to machine?
α+β structure with almost no lead: gummy, long chips — run ~30% of free-cutting brass speed, use positive-rake sharp tools and generous coolant.
Can C46400 be welded?
GTAW/GMAW with silicon-bronze or naval-brass filler is workable but zinc fumes and porosity are issues; brazing and soft soldering are the preferred joining routes.
Can C46400 be formed, bent or molded?
Excellent hot workability (forge/extrude 650–800 °C); cold formability only fair — anneal at 425–600 °C between heavy draws and stress-relieve to avoid SCC.
What surface finishes work on C46400?
Bright-dips, polishes and patinates well; not anodizable — specify lacquer, Ni/Cr or tin plating for appearance or extra corrosion protection.
C46400 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 |
|---|---|---|
| Cu | 59 – 62 | 60.5 |
| Sn | 0.5 – 1 | 0.75 |
| Pbimpurity limit | ≤ 0.2 | 0.05 |
| Feimpurity limit | ≤ 0.1 | 0.05 |
| Znremainder, nominally ~39% | balance | — |
C46400-M30 — frequently asked
What is C46400-M30 used for?
C46400-M30 is typically used for marine hardware, propeller shafts and turnbuckles. In short: salt-water corrosion resistant.
What is the yield strength of C46400-M30?
C46400-M30 has a typical yield strength of 190 MPa (27.6 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 57% of copper alloy grades. Strength varies by condition: see the 12 listed tempers.
Is C46400-M30 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of copper alloy grades). α+β structure with almost no lead: gummy, long chips — run ~30% of free-cutting brass speed, use positive-rake sharp tools and generous coolant.
Can C46400-M30 be welded?
With care — weldability is rated fair (45/100). GTAW/GMAW with silicon-bronze or naval-brass filler is workable but zinc fumes and porosity are issues; brazing and soft soldering are the preferred joining routes.
What surface finishes work on C46400-M30?
Bright-dips, polishes and patinates well; not anodizable — specify lacquer, Ni/Cr or tin plating for appearance or extra corrosion protection.
Can C46400-M30 be formed, bent or molded?
Excellent hot workability (forge/extrude 650–800 °C); cold formability only fair — anneal at 425–600 °C between heavy draws and stress-relieve to avoid SCC.
What is the maximum service temperature of C46400-M30?
C46400-M30 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 C46400-O and C46400-H06?
O is the default condition — pick for maximum ductility: cold bending, forming, spinning and welded fabrications. H06: wire/strip temper for springy marine fasteners and mesh; very limited ductility. Yield strength is 172 MPa in O versus 450 MPa in H06.
Can FabDigit make parts in C46400-M30?
Yes — C46400-M30 is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B21/B21M — Naval Brass Rod, Bar and Shapes — ASTM International (2021)
- ASTM B171/B171M — Copper-Alloy Plate for Condensers and Heat Exchangers — ASTM International (2018)
- CDA Alloy Datasheet C46400 — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol.2 — Properties of Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion of Copper Alloys — ASM International (2005)
- GB/T 4423 (HSn62-1) (2020)
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.