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LESCALLOY D6AC VAC-ARC steel is a medium carbon, low alloy, ultra-high strength steel primarily designed for high strength structural applications requiring strength leaves up to 280 ksi. This alloy provides high yield strength to tensile strength ratio, combined with good ductility. A tough and fibrous fracture is exhibited to as low as -210°F in impact testing; also the notch toughness is excellent. It has been selected for fracture toughness critical applications at a variety of strength levels. The deep hardening characteristics of D6AC steel make it applicable for fairly large sections. Lescalloy D6AC VAC-ARC steel is produced by the consumable electrode vacuum arc remelting process to provide optimum cleanliness and preferred ingot structure, which in turn provide optimum transverse mechanical properties.
| Weight % | C | Mn | Si | Ni | Cr | Mo | V | Fe |
|---|---|---|---|---|---|---|---|---|
| minimum | 0.45 | 0.75 | 0.25 | 0.60 | 1.10 | 1.00 | 0.10 | 95.74 |
| maximum | 0.50 |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density
(68°F/20°C) |
0.284 lbs/in3 | 7.87 g/cm3 | |
| Coefficient of thermal expansion | 0°F – 200°F
-18°C – 93°C |
7.311 micro in/in- °F | 13.16 micro m/m- °K |
| 601°F – 1300°F
316°C – 704°C |
8.95 micro in/in- °F | 16.11 micro m/m- °K |
| Tensile | Hardness | ||||||
|---|---|---|---|---|---|---|---|
| * Before temper:
Austenitized at 900°C Oil quenched and air cooled. |
Ultimate | Yield | Elongation
at break |
Reduction
of area |
Rockwell C | ||
| KSI | MPa | KSI | MPa | % | % | ||
| 316°C
Temper* Temperature |
280 | 1930 | 250 | 1724 | 7 | 23 | 53 |
| 510°C
Temper* Temperature |
228 | 1570 | 195.1 | 1345 | 7 | 25 | 46 |
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