Solder & Low-Melting Alloy Babbitt Grade 2 (Tin-Base) AS-CAST
Heat-treated state · default condition
UNS L13890 · ASTM B23 Grade 2
Standard supply and use condition: ingot remelted and gravity chill-cast; property values from ASTM B23 chill-cast bars.
Values for the AS-CAST condition
Other Babbitt Grade 2 (Tin-Base) tempers and conditions
Babbitt Grade 2 (Tin-Base) is listed in 2 conditions; see the grade overview at Babbitt Grade 2 (Tin-Base).
- AS-CAST
- CENTRIFUGAL
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AS-CASTDefaultThis page As-Cast (chill-cast test bar / ingot remelt) | Standard supply and use condition: ingot remelted and gravity chill-cast; property values from ASTM B23 chill-cast bars. | 42 | 66 | 3 | 25 HB | 8 % IACS |
Centrifugally cast lining | Choose for highest-integrity thin linings (turbine/compressor bearings): finer, denser structure with fewer shrinkage voids and best bond strength. | 45 | 72 | 4 | 26 HB | 8 % IACS |
What is Babbitt Grade 2 (Tin-Base) AS-CAST?
Babbitt Grade 2 (Tin-Base) AS-CAST is Babbitt Grade 2 (Tin-Base) heat treated to AS-CAST — standard supply and use condition: ingot remelted and gravity chill-cast; property values from ASTM B23 chill-cast bars. Babbitt Grade 2 (Tin-Base) AS-CAST has a yield strength of 42 MPa (6.09 ksi) and a tensile strength of 66 MPa (9.57 ksi) — stronger than 91% of solder & low-melting alloy grades. Elongation at break is 3% and the elastic modulus is 53 GPa (7.69 Msi). Babbitt Grade 2 (Tin-Base) AS-CAST has a density of 7.39 g/cm³ (0.267 lb/in³), lighter than 71% of solder & low-melting alloy grades. It melts at 241°C (466 °F).
Advantages
- Stiff — 53 GPa (7.69 Msi), better than 99% of solder & low-melting alloy grades
- High strength — 42 MPa (6.09 ksi), better than 91% of solder & low-melting alloy grades
- Polishes to a fine finish — 70/100, better than 91% of solder & low-melting alloy grades
- Easy to machine — 85/100, better than 89% of solder & low-melting alloy grades
- Conducts heat well — 55 W/m·K (31.8 BTU/hr·ft·°F), better than 78% of solder & low-melting alloy grades
Limitations
- Limited ductility — 3%, worse than 95% of solder & low-melting alloy grades
- Limited formability — 20/100, worse than 95% of solder & low-melting alloy grades
Babbitt Grade 2 (Tin-Base) AS-CAST properties
Typical room-temperature values for Babbitt Grade 2 (Tin-Base) AS-CAST; 19 are specific to this condition. Other listed values are Babbitt Grade 2 (Tin-Base) reference data and may not represent this condition. Bars are the position among solder & low-melting alloy grades.
Physical3
Babbitt Grade 2 (Tin-Base) AS-CAST has a density of 7.39 g/cm³ (0.267 lb/in³), lighter than 71% of solder & low-melting alloy grades. It melts at 241°C (466 °F).
Mechanical13
Babbitt Grade 2 (Tin-Base) AS-CAST has a yield strength of 42 MPa (6.09 ksi) and a tensile strength of 66 MPa (9.57 ksi) — stronger than 91% of solder & low-melting alloy grades. Elongation at break is 3% and the elastic modulus is 53 GPa (7.69 Msi).
Thermal6
Babbitt Grade 2 (Tin-Base) AS-CAST is rated for continuous service to 120°C (248 °F). It conducts heat at 55 W/m·K (31.8 BTU/hr·ft·°F), better than 78% of solder & low-melting alloy grades. Thermal expansion is 23 µm/m·K (12.8 µin/in·°F).
Electrical3
Babbitt Grade 2 (Tin-Base) AS-CAST conducts electricity at 8 % IACS, worse than 73% of solder & low-melting alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), better than 70% of solder & low-melting alloy grades.
Sustainability4
Producing a kilogram of Babbitt Grade 2 (Tin-Base) AS-CAST takes about 260 MJ of energy and emits 17 kg of CO₂ — more than 61% of solder & low-melting alloy grades. Typical recycled content is 30%.
Manufacturability8
Babbitt Grade 2 (Tin-Base) AS-CAST's machinability is excellent (85/100, better than 89% of solder & low-melting alloy grades); weldability poor (20/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Babbitt Grade 2 (Tin-Base) AS-CAST
Is Babbitt Grade 2 (Tin-Base) easy to machine?
Very soft and free-cutting: use sharp high-rake HSS/carbide, high speed, light feed, flood coolant and generous chip clearance to avoid smearing and embedded chips; final bore is usually diamond-bored or burnished.
Can Babbitt Grade 2 (Tin-Base) be welded?
Not fusion weldable to steel; local damage is repaired by torch puddling with matching Grade 2 babbitt over a properly tinned, flux-cleaned surface.
Can Babbitt Grade 2 (Tin-Base) be formed, bent or molded?
Used strictly as a cast lining — pour at about 420–440 °C onto a shell tinned with pure tin at 260–300 °C, then chill from the back to promote directional solidification and avoid shrinkage voids.
What surface finishes work on Babbitt Grade 2 (Tin-Base)?
No anodising or plating; finish by boring/scraping to clearance, oil-groove machining and light burnishing, then dye-penetrant or ultrasonic bond inspection.
Babbitt Grade 2 (Tin-Base) 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 |
|---|---|---|
| Sb | 7 – 8 | 7.5 |
| Cu | 3 – 4 | 3.5 |
| Pbimpurity max | ≤ 0.35 | — |
| Feimpurity max | ≤ 0.08 | — |
| Asimpurity max | ≤ 0.1 | — |
| Biimpurity max | ≤ 0.08 | — |
| Znimpurity max | ≤ 0.01 | — |
| Alimpurity max | ≤ 0.01 | — |
| Cdimpurity max | ≤ 0.05 | — |
| Sn | ≥ 88.25 (balance) | — |
Babbitt Grade 2 (Tin-Base) AS-CAST — frequently asked
What is Babbitt Grade 2 (Tin-Base) AS-CAST used for?
Babbitt Grade 2 (Tin-Base) AS-CAST is typically used for industrial pump bearings, compressor bearings, general machinery plain bearings and bushings. In short: general-purpose tin babbitt; harder than Grade 1; free-cutting bearing lining.
What is the yield strength of Babbitt Grade 2 (Tin-Base) AS-CAST?
Babbitt Grade 2 (Tin-Base) AS-CAST has a typical yield strength of 42 MPa (6.09 ksi) and a tensile strength of 66 MPa (9.57 ksi) — stronger than 91% of solder & low-melting alloy grades. Strength varies by condition: see the 2 listed tempers.
Is Babbitt Grade 2 (Tin-Base) AS-CAST easy to machine?
Yes — machinability is rated excellent (85/100, better than 89% of solder & low-melting alloy grades). Very soft and free-cutting: use sharp high-rake HSS/carbide, high speed, light feed, flood coolant and generous chip clearance to avoid smearing and embedded chips; final bore is usually diamond-bored or burnished.
Can Babbitt Grade 2 (Tin-Base) AS-CAST be welded?
Not readily — weldability is rated poor (20/100). Not fusion weldable to steel; local damage is repaired by torch puddling with matching Grade 2 babbitt over a properly tinned, flux-cleaned surface.
What surface finishes work on Babbitt Grade 2 (Tin-Base) AS-CAST?
No anodising or plating; finish by boring/scraping to clearance, oil-groove machining and light burnishing, then dye-penetrant or ultrasonic bond inspection.
Can Babbitt Grade 2 (Tin-Base) AS-CAST be formed, bent or molded?
Used strictly as a cast lining — pour at about 420–440 °C onto a shell tinned with pure tin at 260–300 °C, then chill from the back to promote directional solidification and avoid shrinkage voids.
What is the maximum service temperature of Babbitt Grade 2 (Tin-Base) AS-CAST?
Babbitt Grade 2 (Tin-Base) AS-CAST is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM B23 — Standard Specification for White Metal Bearing Alloys (Babbitt Metal) — ASTM International (2021)
- GB/T 1174 (ZSnSb8Cu4) — SAC (1992)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (Tin and Tin Alloys) — ASM International (1990)
- ASM Handbook Vol. 18 — Friction, Lubrication and Wear Technology (Bearing Materials) — ASM International (2017)
- Tin babbitt bearing alloy datasheets (ASTM B23 grades) — Bearing-alloy producers / ITRI tin technical data (2020)
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.