Solder & Low-Melting Alloy Sn30Pb70
ASTM Sn30 · JIS H30A · GB HLSnPb30-70
Sn30Pb70 (H30A, HLSnPb30-70) is a lead-heavy Sn-Pb solder with a very wide 183–255 °C pasty range, giving the longest working time of the common wiping alloys.
Reference datasheet — Sn30Pb70 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 Cast condition
Sn30Pb70 tempers and conditions
Sn30Pb70 is supplied in one standard condition, Cast. Cast is the default FabDigit quotes; the values on this page are for it.
Supply forms, finishes and certifications
Ways Sn30Pb70 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
EXT-WIRE | Extruded solid wire / rod | Supply form |
FOIL | Rolled foil / ribbon preform | Supply form |
JOINT | As-soldered lap joint on copper | Supply option |
What is Sn30Pb70?
Sn30Pb70 (H30A, HLSnPb30-70) is a lead-heavy Sn-Pb solder with a very wide 183–255 °C pasty range, giving the longest working time of the common wiping alloys. It was the traditional choice for wiped lead joints in plumbing and lead-sheathed cable work, and is supplied cast and as extruded wire and foil. Strength is low (35 MPa tensile, 22 MPa yield, 45 % elongation, 11 HB), service tops out near 100 °C, and the high lead content excludes potable-water, food-contact and RoHS applications. Sn40Pb60 or Sn50Pb50 wet more readily where a shorter pasty range is acceptable. Sn30Pb70 has a density of 9.7 g/cm³ (0.35 lb/in³), heavier than 70% of solder & low-melting alloy grades. It melts at 183°C (361 °F). Sn30Pb70 has a yield strength of 22 MPa (3.19 ksi) and a tensile strength of 35 MPa (5.08 ksi) — weaker than 70% of solder & low-melting alloy grades. Elongation at break is 45% and the elastic modulus is 25 GPa (3.63 Msi).
What is Sn30Pb70 used for?
- wiped lead joints
- cable sheath sealing
- plumbing caulking
Advantages
- Ductile — tolerates forming and impact — 45%, better than 84% of solder & low-melting alloy grades
Sn30Pb70 properties
Typical room-temperature values for Sn30Pb70-Cast; bars are the position among solder & low-melting alloy grades.
Physical3
Sn30Pb70 has a density of 9.7 g/cm³ (0.35 lb/in³), heavier than 70% of solder & low-melting alloy grades. It melts at 183°C (361 °F).
Mechanical10
Sn30Pb70 has a yield strength of 22 MPa (3.19 ksi) and a tensile strength of 35 MPa (5.08 ksi) — weaker than 70% of solder & low-melting alloy grades. Elongation at break is 45% and the elastic modulus is 25 GPa (3.63 Msi).
Thermal6
Sn30Pb70 is rated for continuous service to 100°C (212 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), worse than 52% of solder & low-melting alloy grades. Thermal expansion is 27 µm/m·K (15 µin/in·°F).
Electrical3
Sn30Pb70 conducts electricity at 9.3 % IACS, better than 50% 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 Sn30Pb70 takes about 105 MJ of energy and emits 6 kg of CO₂ — less than 69% of solder & low-melting alloy grades. Typical recycled content is 45%.
Manufacturability6
Sn30Pb70's machinability is fair (35/100, better than 58% of solder & low-melting alloy grades); 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. Sn30Pb70 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Sn30Pb70
Is Sn30Pb70 easy to machine?
Rarely machined; if needed use very sharp high-rake tools, low speed and paraffin/kerosene lubricant to stop smearing and tool loading.
Can Sn30Pb70 be welded?
Not fusion welded — it is a filler; join sections by re-melting with a torch or soldering pot at 300–320 °C using zinc-chloride/tallow flux.
Can Sn30Pb70 be formed, bent or molded?
Wipes, pours and hand-shapes easily in its 183–255 °C pasty range; cold-rolls or extrudes into wire/foil with almost no work hardening.
Sn30Pb70 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 |
|---|---|---|
| SnASTM B32 grade Sn30 | 29.5 – 31.5 | 30 |
| Sb≤0.12 % for 'A' grade (Sn30A); 0.20–0.50 % for 'B' grade | ≤ 0.5 | 0.1 |
| Bi | ≤ 0.25 | |
| Cu | ≤ 0.08 | |
| Ag | ≤ 0.02 | |
| Fe | ≤ 0.02 | |
| As | ≤ 0.03 | |
| Zn | ≤ 0.01 | |
| Al | ≤ 0.01 | |
| Cd | ≤ 0 | |
| Pb | balance |
What surface finishes work on Sn30Pb70?
Wire-brush and tallow-wipe the joint while warm; the surface dulls to grey lead oxide — do not plate or anodize, and never use on potable-water or food-contact parts.
Equivalent designations
Standards and trade names that resolve to Solder & Low-Melting Alloy Sn30Pb70 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- Sn30
- GB (China)
- HLSnPb30-70
- JIS
- H30A
How much does Sn30Pb70 cost?
Sn30Pb70 is a high-cost solder & low-melting alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sn30Pb70 — frequently asked
What is Sn30Pb70 used for?
Sn30Pb70 is typically used for wiped lead joints, cable sheath sealing and plumbing caulking. In short: longest pasty range; traditional lead-wiping solder; low tin content, low cost.
What is the yield strength of Sn30Pb70?
Sn30Pb70 has a typical yield strength of 22 MPa (3.19 ksi) and a tensile strength of 35 MPa (5.08 ksi) — weaker than 70% of solder & low-melting alloy grades.
Is Sn30Pb70 easy to machine?
Not especially — machinability is rated fair (35/100, better than 58% of solder & low-melting alloy grades). Rarely machined; if needed use very sharp high-rake tools, low speed and paraffin/kerosene lubricant to stop smearing and tool loading.
Can Sn30Pb70 be welded?
Not fusion welded — it is a filler; join sections by re-melting with a torch or soldering pot at 300–320 °C using zinc-chloride/tallow flux.
What surface finishes work on Sn30Pb70?
Wire-brush and tallow-wipe the joint while warm; the surface dulls to grey lead oxide — do not plate or anodize, and never use on potable-water or food-contact parts.
Can Sn30Pb70 be formed, bent or molded?
Wipes, pours and hand-shapes easily in its 183–255 °C pasty range; cold-rolls or extrudes into wire/foil with almost no work hardening.
What is the maximum service temperature of Sn30Pb70?
Sn30Pb70 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Sn30Pb70 cost?
Sn30Pb70 is a high-cost solder & low-melting alloy ($$$$), 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)
- ASTM B907 — Zinc, Tin and Lead Base Alloys in Ingot Form for Solder — ASTM International (2019)
- GB/T 3131 (2020)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (solder alloy properties) — ASM International (1993)
- ASM Specialty Handbook: Tin and Tin Alloys / Lead and Lead Alloys sections — ASM International (1990)
- NIST Database of Solder Alloy Properties — NIST (2002)
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.