H13 STEEL APPLICATION IN LIFE-Chapter 4
Compared to the conventional cast or wrought material, the LC H13 tool steel demonstrated excellent tensile properties. From the references,22–24 the yield and tensile strengths of the annealed cast or wrought H13 were about 370–510 MPa and 670 MPa respectively, while the yield and tensile strengths of the wrought H13 in hardened condition were in the range of 1290–1570 MPa and 1500–1960 MPa, respectively. The tensile and yield strengths of the as-consolidated H13 were substantially higher than the annealed cast or wrought H13, and comparable to the hardened wrought H13. The elastic modulus of the as-consolidated H13 was about the same as the wrought material. However, the elongation of as-consolidated H13 material was about 5–6%, which was lower than the hardened wrought H13. A post heat treatment might be used to improve the elongation of the LC H13 material if required.
The LC H13 showed very good wear resistance. The pin-on-disk wear test results indicated that, under the given test conditions (3.175 mm diameter Cr steel ball of Rc.63; 250 g test load; total 4000 m sliding distance), as-consolidated H13 specimens showed significantly improved wear resistance as compared to hardened wrought H13 specimens. For example, the average volume loss of the as-consolidated H13 specimens was about 0.14 mm3, which was only about 1/3 of the volume loss of the hardened H13 tempered at 482 °C (0.4 mm3) and about one order of magnitude less as compared to the annealed wrought H13 material (1.45 mm3). In addition, the average wear volume loss of Cr steel balls tested against the LC H13 specimens (0.21 mm3) was also significantly less (only 1/3 to 1/4) than that of the balls tested against the hardened or annealed wrought H13 specimens (0.56–0.88 mm3).
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