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A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels.
The retrogression and reage (RRA) temper is a multistage heat treatment temper. Starting with a sheet in the T6 temper, it involves overaging past peak hardness (T6 temper) to near the T7 temper. A subsequent reaging at 120 °C for 24 hours returns the hardness and strength to or very nearly to T6 temper levels. [10]
The hardness may also be shown as XXX HB YYD 2. The XXX is the force to apply (in kgf) on a material of type YY (5 for aluminum alloys, 10 for copper alloys, 30 for steels). Thus a typical steel hardness could be written: 250 HB 30D 2. It could be a maximum or a minimum.
6061 aluminium alloy (Unified Numbering System (UNS) designation A96061) is a precipitation-hardened aluminium alloy, containing magnesium and silicon as its major alloying elements. Originally called "Alloy 61S", it was developed in 1935. [ 2 ]
Aluminum 1100–O (annealed) 0.20: 180 2024 aluminum alloy (heat treated—T3) 0.16: 690 5052-O 0.13 210 Aluminum 6061–O (annealed) 0.20: 205 Aluminum 6061–T6: 0.05: 410 Aluminum 7075–O (annealed) 0.17: 400 Brass, Naval (annealed) 0.49: 895 Brass 70–30 (annealed) 0.49: 900 Brass 85–15 (cold-rolled) 0.34: 580 Cobalt-base alloy (heat ...
The superficial Rockwell scales use lower loads and shallower impressions on brittle and very thin materials. The 45N scale employs a 45-kgf load on a diamond cone-shaped Brale indenter, and can be used on dense ceramics. The 15T scale employs a 15-kgf load on a 1 ⁄ 16-inch-diameter (1.588 mm) hardened steel ball, and can be used on sheet metal.
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Mohs hardness [1] Vickers hardness ... aluminium: 2.75: 160–350: 160–550: 184 14: Si: ... Vickers hardness test; Brinell scale This page was last ...