Cast alloy for valve seat insert
Abstract
Abstract The present invention relates to a cast alloy for a valve seat insert, which has an excellent wear resistance for automobile engines using non-leaded gasoline. The alloy according to the present invention is a phosphoruscontaining precipitation-hardening type austenitic alloy. It can reach the hardness at ordinary temperature of more than HRC 40 by subjecting it to aging treatment after solution heat treatment. Accordingly, the alloy according to the present invention has such features that said alloy has an excellent creep resistance at high temperatures, further an excellent corrosion resistance, and an excellent wear resistance as a valve seat insert for automobile engines using non-lead gasoline. The present invention discloses that such excellent properties are obtained in the austenitic alloy having the following restricted chemical composition: (1) 0.80 to 2.50 % of C, (2) 0.20 to 3.0 % of Si, (3) 0.10 to 5.0 % of Mn, (4) 0.03 to 0.50 % of P, (5) 0.02 to 0.3 % of S, (6) 13.0 to 28.0 % of Ni, (7) 10.0 to 30.0 % of Cr, (8) 0.1 to 5.0 % of Mo, (9) 0.02 to 0.20 % of N, (10) 5.0 to 15.0 % of W, (11) 5.0 to 15.0 % of Co, and the remaining part consisting of iron and a slight amount of impurities.
Inventors
- 👤 K Kusaka
- 👤 T Sekine
- 👤 M Osawa
- 👤 Y Hagiwara
- 👤 Y Takagi
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
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