24 July 2021 6000 Series Aluminum Alloy
6351 Aluminum Alloy Bar
6351-T6 Aluminum Rod is made up of an aluminum alloy with 96% aluminum, silicon, magnesium, manganese, iron, zinc, titanium, copper and other elements in the composition. Micro Metals is a leading manufacturer and supplier of the ASTM 221 6351-T6 Aluminum Round Bar in different dimensions and scales. The density of the material is about 3 times lower than the austenitic stainless steel grades.
The density is 2.7 grams per centimeter cube. The melting point is lower than stainless steels with 600 degrees Celsius. The material has a good thermal expansion and electric conductivity. The AL6351 T6 Hex bar is one of the commonly used types of aluminum bar, but is expensive compared to stainless steels. The specification for these products is the ASTM B221 and the dimensions vary according to the different standards such as ASTM, ASME and other international standards. The size of the bars can range from ¼ inches to 16 inches in diameter.
There are square, round, hex and flat bars. The AA6351-T651 Flat bar is used in metallic structures, frameworks, architecture and in aesthetic applications as well. There are different lengths available for these bars with finishes ranging as bright, polish or black. Please feel free to contact us for more information on the different types of bars such as the ASME SB 221 UNS A96351 Square bar and a price list of aluminum bars.
Chemical Composition:
| Chemical Elements | Metric | English |
|---|---|---|
| Aluminum, Al | 95.9 - 98.5 % | 95.9 - 98.5 % |
| Copper, Cu | <= 0.10 % | <= 0.10 % |
| Iron, Fe | <= 0.50 % | <= 0.50 % |
| Magnesium, Mg | 0.40 - 0.80 % | 0.40 - 0.80 % |
| Manganese, Mn | 0.40 - 0.80 % | 0.40 - 0.80 % |
| Other, each | <= 0.05 % | <= 0.05 % |
| Other, total | <= 0.15 % | <= 0.15 % |
| Silicon, Si | 0.70 - 1.3 % | 0.70 - 1.3 % |
| Titanium, Ti | <= 0.20 % | <= 0.20 % |
| Zinc, Zn | <= 0.20 % | <= 0.20 % |
Mechanical Properties:
| Mechanical Properties | Metric | English | Comments |
|---|---|---|---|
| Hardness, Brinell | 95 | 95 | AA; Typical; 500 g load; 10 mm ball |
| Hardness, Knoop | 130 | 130 | Converted from Brinell Hardness Value |
| Hardness, Rockwell A | 40 | 40 | Converted from Brinell Hardness Value |
| Hardness, Rockwell B | 60 | 60 | Converted from Brinell Hardness Value |
| Hardness, Vickers | 107 | 107 | Converted from Brinell Hardness Value |
| Tensile Strength, Ultimate | 310 MPa | 45000 psi | AA; Typical |
| Tensile Strength, Yield | 283 MPa | 41000 psi | AA; Typical |
| Elongation at Break | 14 % @Thickness 1.59 mm | 14 % @Thickness 0.0625 in | AA; Typical |
| Modulus of Elasticity | 68.9 GPa | 10000 ksi | AA; Typical; Average of tension and compression. Compression modulus is about 2% greater than tensile modulus. |
| Poissons Ratio | 0.33 | 0.33 | Estimated from trends in similar Al alloys. |
| Fatigue Strength | 89.6 MPa @# of Cycles 5.00e+8 | 13000 psi @# of Cycles 5.00e+8 | completely reversed stress; RR Moore machine/specimen |
| Shear Modulus | 26.0 GPa | 3770 ksi | Estimated from similar Al alloys. |
| Shear Strength | 200 MPa | 29000 psi | AA; Typical |
Thermal Properties:
| Thermal Properties | Metric | English | Comments |
|---|---|---|---|
CTE, linear  | 23.4 µm/m-°C @Temperature 20.0 - 100 °C | 13.0 µin/in-°F @Temperature 68.0 - 212 °F | AA; Typical; average over range |
| 25.0 µm/m-°C @Temperature 20.0 - 300 °C | 13.9 µin/in-°F @Temperature 68.0 - 572 °F | ||
| Specific Heat Capacity | 0.890 J/g-°C | 0.213 BTU/lb-°F | Estimated from trends in similar Al alloys. |
| Thermal Conductivity | 176 W/m-K | 1220 BTU-in/hr-ft²-°F | AA; Typical at 77°F |
| Melting Point | 554 - 649 °C | 1030 - 1200 °F | AA; Typical range based on typical composition for wrought products >= 1/4 in. thickness |
| Solidus | 554 °C | 1030 °F | AA; Typical |
| Liquidus | 649 °C | 1200 °F | AA; Typical |
Processing Properties:
| Processing Properties | Metric | English | Comments |
|---|---|---|---|
| Annealing Temperature | 349 °C | 660 °F | hold at temperature for about 4 hr |
| Solution Temperature | 504 °C | 940 °F | |
| Aging Temperature | 170 °C | 338 °F | hold at temperature for 6 hr |