Precious Metal BAg-21
UNS P07630
BAg-21 is a high-silver, cadmium-free BAg braze filler containing nickel and tin, classified under UNS P07630 in the AWS A5.8 silver braze family.
Reference datasheet — BAg-21 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 AS-BRAZED condition
BAg-21 tempers and conditions
BAg-21 is supplied in one standard condition, AS-BRAZED. AS-BRAZED is the default FabDigit quotes; the values on this page are for it.
Supply forms, finishes and certifications
Ways BAg-21 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
POWDER-PASTE | Powder / Paste | Supply form |
PREFORM | / | Supply form |
STRIP | Strip / Foil | Supply form |
WIRE | Wire / Rod | Supply form |
What is BAg-21?
BAg-21 is a high-silver, cadmium-free BAg braze filler containing nickel and tin, classified under UNS P07630 in the AWS A5.8 silver braze family. Engineers select it for high joint strength and elevated-temperature service in critical aerospace hardware, with tensile strength of 450 MPa, yield strength of 300 MPa and 20% elongation in the as-brazed condition; it is supplied as wire, strip, preforms and powder-paste. Service is limited to about 400 °C and electrical conductivity is only 13% IACS, so it is not a conductor-joining alloy. The brazing range of 816–899 °C also requires base metals that tolerate that temperature without grain coarsening or sensitization. BAg-21 has a density of 9.8 g/cm³ (0.354 lb/in³), lighter than 75% of precious metal grades. It melts at 691°C (1,276 °F). BAg-21 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 91% of precious metal grades. Elongation at break is 20% and the elastic modulus is 85 GPa (12.3 Msi).
What is BAg-21 used for?
- jet engine components
- aerospace structural brazed joints
- high-strength stainless assemblies
Advantages
- High strength — 300 MPa (43.5 ksi), better than 91% of precious metal grades
Limitations
- Difficult to weld — 20/100, worse than 86% of precious metal grades
- Limited formability — 70/100, worse than 78% of precious metal grades
- Limited ductility — 20%, worse than 77% of precious metal grades
BAg-21 properties
Typical room-temperature values for BAg-21-AS-BRAZED; bars are the position among precious metal grades.
Physical3
BAg-21 has a density of 9.8 g/cm³ (0.354 lb/in³), lighter than 75% of precious metal grades. It melts at 691°C (1,276 °F).
Mechanical10
BAg-21 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 91% of precious metal grades. Elongation at break is 20% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
BAg-21 is rated for continuous service to 400°C (752 °F). It conducts heat at 65 W/m·K (37.6 BTU/hr·ft·°F), worse than 67% of precious metal grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
BAg-21 conducts electricity at 13 % IACS, worse than 72% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), worse than 66% of precious metal grades.
Sustainability4
Producing a kilogram of BAg-21 takes about 1,100 MJ of energy and emits 90 kg of CO₂ — less than 71% of precious metal grades. Typical recycled content is 45%.
Manufacturability6
BAg-21's machinability is fair (35/100, worse than 73% of precious metal grades); weldability poor (20/100); formability very good (70/100).
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 precious metal family
Yield strength against density for every precious metal grade FabDigit runs. BAg-21 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BAg-21
Is BAg-21 easy to machine?
The filler itself is seldom machined; if preforms must be turned, use sharp tools with a large positive rake, low speeds and ample lubricant to prevent smearing and built-up edge.
Can BAg-21 be welded?
Used as a brazing filler, not for fusion welding. Braze at 816–899 °C; the base metal must withstand that temperature without grain coarsening or sensitization.
Can BAg-21 be formed, bent or molded?
Can be drawn to wire, rolled to strip and stamped into preplaced rings. The melting range spans roughly 110 °C, so hold joint clearances at 0.05–0.13 mm and heat rapidly through the mushy range to avoid liquation and segregation.
BAg-21 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 |
|---|---|---|
| AgAWS A5.8 BAg-21 / UNS P07630 | 62 – 64 | 63 |
| Cu | 27.5 – 29.5 | 28.5 |
| Snlowers melting point, improves flow | 5 – 7 | 6 |
| Niimproves wetting of stainless/carbide, resists interface corrosion | 2 – 3 | 2.5 |
| Cdcadmium-free formulation | ≤ 0.01 | 0 |
| Znessentially Zn-free; suitable for vacuum brazing | ≤ 0.05 | 0 |
| Other (total)maximum total impurities | ≤ 0.15 |
What surface finishes work on BAg-21?
The brazed fillet is silver-white and can be polished. The alloy contains no cadmium or zinc, so torch-brazing fume toxicity is low, but ventilation is still required and borax-type flux residues must be removed after brazing to prevent corrosion.
Equivalent designations
Standards and trade names that resolve to Precious Metal BAg-21 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07630
- Also called
- AWS BAg-21
How much does BAg-21 cost?
BAg-21 is a high-cost precious metal ($$$$), 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.
BAg-21 — frequently asked
What is BAg-21 used for?
BAg-21 is typically used for jet engine components, aerospace structural brazed joints and high-strength stainless assemblies. In short: highest-strength BAg filler; cadmium-free aerospace grade; 400 °C service capability.
What is the yield strength of BAg-21?
BAg-21 has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 91% of precious metal grades.
Is BAg-21 easy to machine?
Not especially — machinability is rated fair (35/100, worse than 73% of precious metal grades). The filler itself is seldom machined; if preforms must be turned, use sharp tools with a large positive rake, low speeds and ample lubricant to prevent smearing and built-up edge.
Can BAg-21 be welded?
Not readily — weldability is rated poor (20/100). Used as a brazing filler, not for fusion welding. Braze at 816–899 °C; the base metal must withstand that temperature without grain coarsening or sensitization.
What surface finishes work on BAg-21?
The brazed fillet is silver-white and can be polished. The alloy contains no cadmium or zinc, so torch-brazing fume toxicity is low, but ventilation is still required and borax-type flux residues must be removed after brazing to prevent corrosion.
Can BAg-21 be formed, bent or molded?
Can be drawn to wire, rolled to strip and stamped into preplaced rings. The melting range spans roughly 110 °C, so hold joint clearances at 0.05–0.13 mm and heat rapidly through the mushy range to avoid liquation and segregation.
What is the maximum service temperature of BAg-21?
BAg-21 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.
How much does BAg-21 cost?
BAg-21 is a high-cost precious metal ($$$$), 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
- AWS A5.8/A5.8M — Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- ASM Handbook Vol. 6 — Welding, Brazing, and Soldering — ASM International (1993)
- AWS Brazing Handbook, 5th ed. — American Welding Society (2007)
- GB/T 10046 (2018)
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.