Precious Metal Ag149 AS-BRAZED
Heat-treated state
ISO ISO 17672 Ag149
Reference condition for design: properties of the solidified filler in a 0.05–0.13 mm joint on steel or WC-Co.
Values for the AS-BRAZED condition
What is Ag149 AS-BRAZED?
Ag149 AS-BRAZED is Ag149 heat treated to AS-BRAZED — reference condition for design: properties of the solidified filler in a 0.05–0.13 mm joint on steel or WC-Co. Ag149 AS-BRAZED has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 91% of precious metal grades. Elongation at break is 15% and the elastic modulus is 85 GPa (12.3 Msi). Ag149 AS-BRAZED has a density of 9 g/cm³ (0.325 lb/in³), lighter than 92% of precious metal grades. It melts at 680°C (1,256 °F).
Advantages
- Lightweight — 9 g/cm³ (0.325 lb/in³), better than 92% of precious metal grades
- High strength — 300 MPa (43.5 ksi), better than 91% of precious metal grades
- Low embodied carbon — 55 kg CO₂/kg, better than 86% of precious metal grades
Limitations
- Needs corrosion protection — 58/100, worse than 90% of precious metal grades
- Limited formability — 55/100, worse than 89% of precious metal grades
- Limited ductility — 15%, worse than 86% of precious metal grades
- Low electrical conductivity — 11 % IACS, worse than 75% of precious metal grades
Ag149 AS-BRAZED properties
Typical room-temperature values for Ag149 AS-BRAZED; 5 are specific to this condition. Other listed values are Ag149 reference data and may not represent this condition. Bars are the position among precious metal grades.
Physical3
Ag149 AS-BRAZED has a density of 9 g/cm³ (0.325 lb/in³), lighter than 92% of precious metal grades. It melts at 680°C (1,256 °F).
Mechanical10
Ag149 AS-BRAZED has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 91% of precious metal grades. Elongation at break is 15% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal5
Ag149 AS-BRAZED is rated for continuous service to 400°C (752 °F). It conducts heat at 60 W/m·K (34.7 BTU/hr·ft·°F), worse than 72% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
Ag149 AS-BRAZED conducts electricity at 11 % IACS, worse than 75% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 90% of precious metal grades.
Sustainability4
Producing a kilogram of Ag149 AS-BRAZED takes about 780 MJ of energy and emits 55 kg of CO₂ — less than 86% of precious metal grades. Typical recycled content is 40%.
Manufacturability3
Ag149 AS-BRAZED's formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ag149 AS-BRAZED
Is Ag149 easy to machine?
Filler metal is not a structural machining stock; the solidified braze fillet is soft and gummy and should be ground rather than turned when cleaning carbide tips.
Can Ag149 be welded?
Not a weldable structural alloy — it is a brazing filler; brazing range 700–840 °C with high-temperature boron-modified flux (FH12/AWS FB3-C), short heat cycles to limit Zn loss.
Can Ag149 be formed, bent or molded?
Supplied as drawn wire, rolled strip and stamped preforms; anneal between draws because Mn/Ni cause rapid work hardening.
What surface finishes work on Ag149?
Remove all flux residue by hot water quench or 10% citric/sulphuric pickle; braze fillets can be lightly polished but will darken (Ag/Cu sulphide tarnish) in sulphur-bearing air.
Ag149 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 |
|---|---|---|
| Ag | 48 – 50 | 49 |
| Cu | 15 – 17 | 16 |
| Mnimproves wetting of WC-Co and joint strength | 7 – 8 | 7.5 |
| Niraises strength and resistance to erosion of the carbide | 4 – 5 | 4.5 |
| CdCd-free grade; impurity limit | ≤ 0.01 | — |
| Pbimpurity limit | ≤ 0.03 | — |
| Other (total)total of unspecified elements | ≤ 0.15 | — |
| Znbalance, approx. 23 % | balance | — |
Ag149 AS-BRAZED — frequently asked
What is Ag149 AS-BRAZED used for?
Ag149 AS-BRAZED is typically used for tungsten-carbide saw tip brazing, cutting tool tip attachment and high-strength tool and die brazing. In short: highest-strength silver braze; carbide tip specialist; elevated liquidus filler.
What is the yield strength of Ag149 AS-BRAZED?
Ag149 AS-BRAZED has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 91% of precious metal grades.
Is Ag149 AS-BRAZED easy to machine?
Filler metal is not a structural machining stock; the solidified braze fillet is soft and gummy and should be ground rather than turned when cleaning carbide tips.
Can Ag149 AS-BRAZED be welded?
Not a weldable structural alloy — it is a brazing filler; brazing range 700–840 °C with high-temperature boron-modified flux (FH12/AWS FB3-C), short heat cycles to limit Zn loss.
What surface finishes work on Ag149 AS-BRAZED?
Remove all flux residue by hot water quench or 10% citric/sulphuric pickle; braze fillets can be lightly polished but will darken (Ag/Cu sulphide tarnish) in sulphur-bearing air.
Can Ag149 AS-BRAZED be formed, bent or molded?
Supplied as drawn wire, rolled strip and stamped preforms; anneal between draws because Mn/Ni cause rapid work hardening.
What is the maximum service temperature of Ag149 AS-BRAZED?
Ag149 AS-BRAZED is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- EN ISO 17672 Brazing — Filler metals — ISO/CEN (2016)
- AWS A5.8/A5.8M Specification for Filler Metals for Brazing and Braze Welding (BAg-22) — AWS (2019)
- EN 1044 Brazing — Filler metals (AG 502) — CEN (1999)
- GB/T 10046 (BAg49ZnCuMnNi) — SAC (2018)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- Silver brazing alloy datasheets (Lucas-Milhaupt, Umicore, Johnson Matthey, ) — various producers (2023)
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.