Introduction
712.0 is an aluminum-zinc alloy grade covered by ASTM B26/B26M. Typical applications include decorative castings, farm-machinery components and machine-tool parts.
| Field | Value |
|---|---|
| Designation | 712.0 |
| Material Type | Aluminum Alloy |
| Sub Type | Aluminum-Zinc Alloy |
| Product Form | casting |
Manufacturing Process
Sand Casting
Equivalent Materials
N/A
Similar Materials
N/A
Reference Standards
| Standard | Standard Title | Edition | Specification | Identifier |
|---|---|---|---|---|
| ASTM B26/B26M | Standard Specification for Aluminum-Alloy Sand Castings | 05 | 712.0 | UNS A07120 |
Related Casting Products
Physical Properties
N/A
Chemical Composition
| Element | ASTM B26/B26MEdition 05 · wt.% |
|---|---|
| Si | ≤ 0.30 |
| Fe | ≤ 0.50 |
| Cu | ≤ 0.25 |
| Mn | ≤ 0.10 |
| Mg | 0.50–0.65 |
| Cr | 0.40–0.6 |
| Zn | 5.0–6.5 |
| Ti | 0.15–0.25 |
| Al | remainder |
Notes
ASTM B26/B26M · Edition 05
[1] Chemical composition: Other elements, each: ≤ 0.05 wt.%
[2] Chemical composition: Other elements, total: ≤ 0.20 wt.%
Heat Treatment
ASTM B26/B26M–05 · Sand Casting · T5 · ambient aging route · Recommended heat treatment
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Recommended: Natural aging | Holding time: 21 day[1] | — |
ASTM B26/B26M–05 · Sand Casting · T5 · artificial aging route · Recommended heat treatment
| Step | Operation | Temperature | Cooling |
|---|---|---|---|
| 1 | Recommended: Precipitation heat treatment | 315 °F / 155 °C; Holding time: 6–8 h[2] | Still air outside furnace |
Notes
ASTM B26/B26M · Edition 05
[1] T5, T5 · ambient aging route · Recommended heat treatment: room temperature; Source: ASTM B917/B917M–25 (Recommended; when specified by the material specification or purchase order).; ±10°F; Use suitable metal-temperature measurement; sections/microstructure affect soak time selection (7.2).; Alternative ambient aging route; not combined with the other route.; No quenching required. Cool in still air outside the furnace.; ±5°C
[2] T5, T5 · artificial aging route · Recommended heat treatment: Source: ASTM B917/B917M–25 (Recommended; when specified by the material specification or purchase order).; ±10°F; Use suitable metal-temperature measurement; sections/microstructure affect soak time selection (7.2).; Alternative artificial aging route; not combined with the other route.; No quenching required. Cool in still air outside the furnace.; ±5°C
Mechanical Properties
Core Mechanical Properties
ASTM B26/B26M — 05 · Table 2 — Normative
ASTM B26/B26M — 05 · Table 2 — Informative
| Property | T5 |
|---|---|
| Brinell Hardness | 75 HB[3] |
ASTM B26/B26M — 05 · Table 3 — Normative
ASTM B26/B26M — 05 · Table 3 — Informative
| Property | T5 |
|---|---|
| Brinell Hardness | 75 HB[6] |
Notes
ASTM B26/B26M · Edition 05
[1] Tensile Strength/Elongation: inch-pound; 2 in. or 4 x diameter
[2] Yield Strength (Rp0.2): inch-pound; 2 in. or 4 x diameter; yield-strength determination specified in contract or purchase order
[3] Brinell Hardness: inch-pound; 2 in. or 4 x diameter; 500 kgf; 10 mm; Typical hardness is for information only, not required for acceptance
[4] Tensile Strength/Elongation: SI; 5 x diameter
[5] Yield Strength (Rp0.2): SI; 5 x diameter; yield-strength determination specified in contract or purchase order
[6] Brinell Hardness: SI; 5 x diameter; 500 kgf; 10 mm; Typical hardness is for information only, not required for acceptance
Welding Conditions
N/A
Applications
Aluminum-zinc alloy ASTM B26/B26M 712.0 is used for decorative castings, farm-machinery components and machine-tool parts. Other cast components used in this material family include furniture parts and large or intricate castings. Applications include selected machinery, industrial hardware and appearance-oriented products. Drive hubs, rollers and pump components remain attached to the grades for which they are documented; aluminum-zinc castings are not zinc-base die-casting or wrought aerospace alloys.
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