Precious Metal PSr45
GOST PSr45 (ПСр45)
ПСр45 is a mid-high silver Ag-Cu-Zn braze filler to GOST 19738, filling broadly the same role as AWS BAg-1 in CIS-standard fabrication.
Reference datasheet — PSr45 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.
PSr45 tempers and conditions
PSr45 is supplied in one standard condition, AS-BRAZED.
Supply forms, finishes and certifications
Ways PSr45 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
STRIP | Strip / foil / stamped preform | Supply form |
Wire-AnnDefault | Wire/Rod, annealed | Supply form |
WIRE-HD | Wire/Rod, hard drawn | Supply form |
POWDER | Atomised powder / flux-bonded paste | Printing process |
What is PSr45?
ПСр45 is a mid-high silver Ag-Cu-Zn braze filler to GOST 19738, filling broadly the same role as AWS BAg-1 in CIS-standard fabrication. It is the general-purpose choice for copper, brass and steel joints: free-flowing and ductile at 410 MPa tensile, 200 MPa yield, 28 % elongation and 90 HB, and available as annealed or hard-drawn wire, strip, powder and stamped preforms. Zinc volatilization keeps it to flux or inert-gas brazing rather than vacuum furnaces, and silver cost pushes high-volume users toward ПСр25. Use ПСр70 where the narrowest melting range and fastest flow are required. PSr45 has a density of 9.1 g/cm³ (0.329 lb/in³), lighter than 89% of precious metal grades. It melts at 660°C (1,220 °F). PSr45 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 410 MPa (59.5 ksi) — stronger than 51% of precious metal grades. Elongation at break is 28% and the elastic modulus is 83 GPa (12 Msi).
What is PSr45 used for?
- copper and brass pipe brazing
- general fabrication brazing
- HVAC service brazing
Advantages
- Lightweight — 9.1 g/cm³ (0.329 lb/in³), better than 89% of precious metal grades
- Low embodied carbon — 58 kg CO₂/kg, better than 83% of precious metal grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 89% of precious metal grades
- Difficult to weld — 20/100, worse than 86% of precious metal grades
- Needs corrosion protection — 62/100, worse than 83% of precious metal grades
- Hard to polish — 70/100, worse than 76% of precious metal grades
PSr45 properties
Typical room-temperature values; bars are the position among precious metal grades.
Physical3
PSr45 has a density of 9.1 g/cm³ (0.329 lb/in³), lighter than 89% of precious metal grades. It melts at 660°C (1,220 °F).
Mechanical9
PSr45 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 410 MPa (59.5 ksi) — stronger than 51% of precious metal grades. Elongation at break is 28% and the elastic modulus is 83 GPa (12 Msi).
Thermal6
PSr45 is rated for continuous service to 200°C (392 °F). It conducts heat at 110 W/m·K (63.6 BTU/hr·ft·°F), better than 60% of precious metal grades. Thermal expansion is 19 µm/m·K (10.6 µin/in·°F).
Electrical3
PSr45 conducts electricity at 21 % IACS, better than 57% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 83% of precious metal grades.
Sustainability4
Producing a kilogram of PSr45 takes about 705 MJ of energy and emits 58 kg of CO₂ — less than 89% of precious metal grades. Typical recycled content is 45%.
Manufacturability7
PSr45's machinability is fair (45/100, better than 59% of precious metal grades); weldability poor (20/100); formability very good (80/100).
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. PSr45 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with PSr45
Is PSr45 easy to machine?
Rarely machined; soft and gummy — use sharp positive-rake tools, high speed, light feed, avoid smearing.
Can PSr45 be welded?
Not a structural weld alloy; joined by brazing itself — keep torch heat off the filler, heat the base metal and let it melt the rod.
Can PSr45 be formed, bent or molded?
Annealed material draws to fine wire and rolls to foil readily; interstage anneal at ~600 °C after ~50 % reduction.
PSr45 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 |
|---|---|---|
| Ag45 ± 0.5 % per GOST 19738 | 44.5 – 45.5 | 45 |
| Cu30 ± 0.5 % | 29.5 – 30.5 | 30 |
| Pbimpurity limit | ≤ 0.01 | — |
| Biimpurity limit | ≤ 0.01 | — |
| Feimpurity limit | ≤ 0.1 | — |
| Cdcadmium-free grade | ≤ 0.01 | — |
| Znbalance, nominally ~25 % | balance | — |
What surface finishes work on PSr45?
Braze with a boron/fluoride flux (FB3-A / ПВ209 class), remove flux residue in hot water or acid; joint can be polished or plated (Ni/Sn) to reduce tarnish.
Equivalent designations
Standards and trade names that resolve to Precious Metal PSr45 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GOST
- ПСр45
How much does PSr45 cost?
PSr45 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
PSr45 — frequently asked
What is PSr45 used for?
PSr45 is typically used for copper and brass pipe brazing, general fabrication brazing and HVAC service brazing. In short: GOST workhorse silver braze; AWS BAg-1 role; balanced cost and flow.
What is the yield strength of PSr45?
PSr45 has a typical yield strength of 200 MPa (29 ksi) and a tensile strength of 410 MPa (59.5 ksi) — stronger than 51% of precious metal grades.
Is PSr45 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). Rarely machined; soft and gummy — use sharp positive-rake tools, high speed, light feed, avoid smearing.
Can PSr45 be welded?
Not readily — weldability is rated poor (20/100). Not a structural weld alloy; joined by brazing itself — keep torch heat off the filler, heat the base metal and let it melt the rod.
What surface finishes work on PSr45?
Braze with a boron/fluoride flux (FB3-A / ПВ209 class), remove flux residue in hot water or acid; joint can be polished or plated (Ni/Sn) to reduce tarnish.
Can PSr45 be formed, bent or molded?
Annealed material draws to fine wire and rolls to foil readily; interstage anneal at ~600 °C after ~50 % reduction.
What is the maximum service temperature of PSr45?
PSr45 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does PSr45 cost?
PSr45 is a high-cost precious metal ($$$$), 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
- GOST 19738-74 Silver brazing alloys — grades and composition — Gosstandart (1974)
- AWS A5.8/A5.8M Specification for Filler Metals for Brazing (BAg-5 comparison) — AWS (2019)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- GB/T 10046 — SAC (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.