11.6.2 Three Types of Reference Materials:
11.6.2.1 AISI D-2 Tool Steel (Nonfree-Machining Type) This is Reference Material No. 1 for Procedure A.12
(a) Harden 1010°C (1850°F)25 min at temperature. (b) Air cool to room temperature.
(c) Temper at 205°C (400°F)1 h at temperature. (d) Air Cool Hardness 59–60 HRC.
(e) Procedure A, qualifying volume loss range36 6 5 mm3.
11.6.2.2 AISI H-13 Tool Steel This is Reference Material
No. 2 for Procedure B.13
(a) Harden 1010/1024°C (1850/1875°F) in neutral salt bath 25 min at temperature.
(b) Air cool to room temperature.
(c) Double temper at 593°C (1100°F) for 2 h and 2 h. Air cool between tempers. Hardness 47–48 HRC.
(d) Procedure B, qualifying volume loss range56 6 4 mm3.
11.6.2.3 AISI 4340 Steel This is Reference Material No. 3 for Procedures B or E.
(a) Normalizing heat treatment. (b) Hardness 31-33 HRC.
(c) Procedure E, qualifying volume loss range 49 6 3 mm3.
(d) Procedure B, qualifying volume loss range 91 6 5 mm3.
11.6.3 Volume loss values for reference materials are devel- oped in interlaboratory testing by the Abrasive Wear Task Group of ASTM Subcommittee G02.30.14 (See X1.3 for typical volume loss values of other materials.) It is the intent of Subcommittee G02.30 to develop several reference materials for abrasive wear testing.