Solder & Low-Melting Alloy Pb74Sn25Sb1
ISO 9453-136
Pb74Sn25Sb1 is a low-tin antimonial lead solder that trades tin content for economy while the 1% antimony gives a modest strength gain (22 MPa yield, 34 MPa tensile, 32% elongation, 12 HB).
Reference datasheet — Pb74Sn25Sb1 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.
What is Pb74Sn25Sb1?
Pb74Sn25Sb1 is a low-tin antimonial lead solder that trades tin content for economy while the 1% antimony gives a modest strength gain (22 MPa yield, 34 MPa tensile, 32% elongation, 12 HB). It suits general-purpose soldering under mild load, sheet metal seams and cable work, and is available as bar, wire, cored wire and foil. The wide 183–266 °C pasty range demands an undisturbed freeze, the alloy creeps under sustained load, and service is limited to about 100 °C. Pb69Sn30Sb1 or Pb58Sn40Sb2 are the alternatives where higher tin and strength are needed. Pb74Sn25Sb1 has a density of 9.96 g/cm³ (0.36 lb/in³), heavier than 75% of solder & low-melting alloy grades. It melts at 183°C (361 °F). Pb74Sn25Sb1 has a yield strength of 22 MPa (3.19 ksi) and a tensile strength of 34 MPa (4.93 ksi) — weaker than 70% of solder & low-melting alloy grades. Elongation at break is 35% and the elastic modulus is 25 GPa (3.63 Msi).
What is Pb74Sn25Sb1 used for?
- general purpose soldering under mild load
- sheet metal seams
- cable work
Limitations
- Difficult to weld — 10/100, worse than 94% of solder & low-melting alloy grades
- Heavy — 9.96 g/cm³ (0.36 lb/in³), worse than 75% of solder & low-melting alloy grades
Pb74Sn25Sb1 properties
Typical room-temperature values; bars are the position among solder & low-melting alloy grades.
Physical3
Pb74Sn25Sb1 has a density of 9.96 g/cm³ (0.36 lb/in³), heavier than 75% of solder & low-melting alloy grades. It melts at 183°C (361 °F).
Mechanical10
Pb74Sn25Sb1 has a yield strength of 22 MPa (3.19 ksi) and a tensile strength of 34 MPa (4.93 ksi) — weaker than 70% of solder & low-melting alloy grades. Elongation at break is 35% and the elastic modulus is 25 GPa (3.63 Msi).
Thermal6
Pb74Sn25Sb1 is rated for continuous service to 100°C (212 °F). It conducts heat at 43 W/m·K (24.8 BTU/hr·ft·°F), worse than 56% of solder & low-melting alloy grades. Thermal expansion is 27 µm/m·K (15 µin/in·°F).
Electrical3
Pb74Sn25Sb1 conducts electricity at 9 % IACS, worse than 54% of solder & low-melting alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 52% of solder & low-melting alloy grades.
Sustainability4
Producing a kilogram of Pb74Sn25Sb1 takes about 95 MJ of energy and emits 5.5 kg of CO₂ — less than 71% of solder & low-melting alloy grades. Typical recycled content is 60%.
Manufacturability6
Pb74Sn25Sb1's machinability is fair (35/100, better than 58% of solder & low-melting alloy grades); weldability not recommended (10/100); formability excellent (90/100).
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 solder & low-melting alloy family
Yield strength against density for every solder & low-melting alloy grade FabDigit runs. Pb74Sn25Sb1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Pb74Sn25Sb1
Is Pb74Sn25Sb1 easy to machine?
Extremely soft and gummy — use sharp high-rake tools, generous lubricant and light cuts; collect swarf as lead-bearing waste.
Can Pb74Sn25Sb1 be welded?
Not fusion welded; joints are made by soldering with the alloy itself, and reflow/rework must respect the wide 183–266 °C pasty range.
Can Pb74Sn25Sb1 be formed, bent or molded?
Cast into bar or extruded into wire/foil at room temperature; the alloy creeps under sustained load so avoid pre-loaded formed parts.
Pb74Sn25Sb1 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 |
|---|---|---|
| Sn | 24 – 26 | 25 |
| Sbantimonial grade; solid-solution strengthening | 0.8 – 1.2 | 1 |
| Biimpurity limit | ≤ 0.25 | |
| Cuimpurity limit | ≤ 0.08 | |
| Feimpurity limit | ≤ 0.02 | |
| Znimpurity limit; degrades wetting | ≤ 0.01 | |
| Alimpurity limit | ≤ 0.01 | |
| Asimpurity limit | ≤ 0.03 | |
| Agimpurity limit | ≤ 0.02 | |
| Pb≈74 % | balance |
What surface finishes work on Pb74Sn25Sb1?
Solder joints are cleaned of flux residue (rosin: alcohol or saponifier; acid flux: hot water rinse plus neutralizer); can be wire-brushed or tinned but not anodized or bright-plated.
Equivalent designations
Standards and trade names that resolve to Solder & Low-Melting Alloy Pb74Sn25Sb1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ISO
- 9453-136
How much does Pb74Sn25Sb1 cost?
Pb74Sn25Sb1 is a high-cost solder & low-melting alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Pb74Sn25Sb1 — frequently asked
What is Pb74Sn25Sb1 used for?
Pb74Sn25Sb1 is typically used for general purpose soldering under mild load, sheet metal seams and cable work. In short: lowest-cost antimonial Sn-Pb; wide pasty range; mild-load joints only.
What is the yield strength of Pb74Sn25Sb1?
Pb74Sn25Sb1 has a typical yield strength of 22 MPa (3.19 ksi) and a tensile strength of 34 MPa (4.93 ksi) — weaker than 70% of solder & low-melting alloy grades.
Is Pb74Sn25Sb1 easy to machine?
Not especially — machinability is rated fair (35/100, better than 58% of solder & low-melting alloy grades). Extremely soft and gummy — use sharp high-rake tools, generous lubricant and light cuts; collect swarf as lead-bearing waste.
Can Pb74Sn25Sb1 be welded?
Not readily — weldability is rated not recommended (10/100). Not fusion welded; joints are made by soldering with the alloy itself, and reflow/rework must respect the wide 183–266 °C pasty range.
What surface finishes work on Pb74Sn25Sb1?
Solder joints are cleaned of flux residue (rosin: alcohol or saponifier; acid flux: hot water rinse plus neutralizer); can be wire-brushed or tinned but not anodized or bright-plated.
Can Pb74Sn25Sb1 be formed, bent or molded?
Cast into bar or extruded into wire/foil at room temperature; the alloy creeps under sustained load so avoid pre-loaded formed parts.
What is the maximum service temperature of Pb74Sn25Sb1?
Pb74Sn25Sb1 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Pb74Sn25Sb1 cost?
Pb74Sn25Sb1 is a high-cost solder & low-melting alloy ($$$$), 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
- ASTM B32 Standard Specification for Solder Metal — ASTM International (2020)
- GB/T 3131 (2020)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (Solder Alloy Properties) — ASM International (1993)
- ASM Specialty Handbook: Nonferrous Alloys — Lead and Lead Alloys — ASM International (1997)
- NIST Database of Solder Properties with Emphasis on New Lead-Free Solders — NIST/Colorado School of Mines (2002)
- Antimonial Sn/Pb Solder Bar & Wire Datasheets — Indium Corporation / AIM Solder (2023)
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.