Copper Alloy HBsC1-SR (Stress relieved)
Heat-treated state
Use when castings are welded, heavily machined or serve in ammonia/marine environments where residual-stress cracking must be avoided.
Values for the SR condition
Other HBsC1 tempers and conditions
HBsC1 is listed in 5 conditions; see the grade overview at HBsC1.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SRThis page Stress relieved | Use when castings are welded, heavily machined or serve in ammonia/marine environments where residual-stress cracking must be avoided. | 175 | 480 | 30 | 95 HB | 23 % IACS |
F-SANDDefault F | Standard as-cast sand-mould condition; the normal stocked/ordered form for gears, marine fittings and general high-strength brass castings. | 180 | 490 | 28 | 100 HB | 22 % IACS |
F | Semi-finished continuously cast rod or hollow bar for machined bushings and nuts; uniform structure, minimal machining allowance. | 195 | 500 | 26 | 100 HB | 22 % IACS |
F | Choose for higher-volume small parts needing finer grain, better surface and slightly higher strength than sand casting. | 200 | 510 | 25 | 105 HB | 22 % IACS |
F | Pick for bushings, worm-gear rims and sleeves where dense, porosity-free rings with best mechanical consistency are required. | 205 | 520 | 25 | 105 HB | 22 % IACS |
What is HBsC1-SR?
HBsC1-SR is HBsC1 heat treated to SR — use when castings are welded, heavily machined or serve in ammonia/marine environments where residual-stress cracking must be avoided. HBsC1-SR has a yield strength of 175 MPa (25.4 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 60% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 103 GPa (14.9 Msi). HBsC1-SR has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 862°C (1,584 °F). F-SAND is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- Low embodied carbon — 2.8 kg CO₂/kg, better than 100% of copper alloy grades
- Ductile — tolerates forming and impact — 30%, better than 75% of copper alloy grades
HBsC1-SR properties
Typical room-temperature values for HBsC1-SR; 21 are specific to this condition. Other listed values are HBsC1 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
HBsC1-SR has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 862°C (1,584 °F).
Mechanical15
HBsC1-SR has a yield strength of 175 MPa (25.4 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 60% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
HBsC1-SR is rated for continuous service to 200°C (392 °F). It conducts heat at 87 W/m·K (50.3 BTU/hr·ft·°F), better than 53% of copper alloy grades. Thermal expansion is 21.6 µm/m·K (12 µin/in·°F).
Electrical3
HBsC1-SR conducts electricity at 23 % IACS, better than 56% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of HBsC1-SR takes about 45 MJ of energy and emits 2.8 kg of CO₂ — less than 97% of copper alloy grades. Typical recycled content is 70%.
Manufacturability8
HBsC1-SR's machinability is poor (34/100, worse than 53% of copper alloy grades); weldability fair (40/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with HBsC1-SR
Is HBsC1 easy to machine?
Machines to roughly 25–30 % of free-cutting brass: use sharp positive-rake carbide, moderate speed and flood coolant since the low-Pb β-phase structure is gummy and tears at low feed.
Can HBsC1 be welded?
GTAW/GMAW with silicon-bronze or aluminium-bronze filler is possible for repair; expect zinc fume and porosity, preheat 150–200 °C and stress-relieve after welding.
Can HBsC1 be formed, bent or molded?
A casting alloy only — good fluidity in sand, permanent mould, centrifugal and continuous casting; needs generous risering because of a fairly wide freezing range and high shrinkage.
What surface finishes work on HBsC1?
Takes a bright mechanical polish and accepts Ni/Cr or tin plating and chemical patination; not anodizable, and lacquer or cathodic protection is advisable in stagnant seawater to limit dezincification.
HBsC1 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 | 55 – 60 | 57.5 |
| Al | 0.5 – 1.5 | 1 |
| Fe | 0.5 – 1.5 | 1 |
| Mn | 0.1 – 1.5 | 0.5 |
| Snimpurity limit | ≤ 1 | — |
| Pbimpurity limit | ≤ 0.4 | — |
| Znremainder, approx. 33–42 % | balance | — |
HBsC1-SR — frequently asked
What is HBsC1-SR used for?
HBsC1-SR is typically used for marine propeller hubs, gears and structural castings. In short: high-strength JIS cast brass; weld-repairable manganese bronze; gummy, low machinability.
What is the yield strength of HBsC1-SR?
HBsC1-SR has a typical yield strength of 175 MPa (25.4 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 60% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is HBsC1-SR easy to machine?
Not especially — machinability is rated poor (34/100, worse than 53% of copper alloy grades). Machines to roughly 25–30 % of free-cutting brass: use sharp positive-rake carbide, moderate speed and flood coolant since the low-Pb β-phase structure is gummy and tears at low feed.
Can HBsC1-SR be welded?
With care — weldability is rated fair (40/100). GTAW/GMAW with silicon-bronze or aluminium-bronze filler is possible for repair; expect zinc fume and porosity, preheat 150–200 °C and stress-relieve after welding.
What surface finishes work on HBsC1-SR?
Takes a bright mechanical polish and accepts Ni/Cr or tin plating and chemical patination; not anodizable, and lacquer or cathodic protection is advisable in stagnant seawater to limit dezincification.
Can HBsC1-SR be formed, bent or molded?
A casting alloy only — good fluidity in sand, permanent mould, centrifugal and continuous casting; needs generous risering because of a fairly wide freezing range and high shrinkage.
What is the maximum service temperature of HBsC1-SR?
HBsC1-SR 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 HBsC1 F-SAND and HBsC1 F-CENT?
F-SAND is the default condition — standard as-cast sand-mould condition; the normal stocked/ordered form for gears, marine fittings and general high-strength brass castings. F-CENT: pick for bushings, worm-gear rims and sleeves where dense, porosity-free rings with best mechanical consistency are required. Yield strength is 180 MPa in F-SAND versus 205 MPa in F-CENT.
Sources
- JIS H5120 Copper and copper alloy castings (CAC301 / HBsC1) — JSA (2016)
- C86500 alloy datasheet (manganese bronze) — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (copper alloys in seawater) — ASM International (2005)
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.