US 11,988,294 B2
Sintered valve seat insert and method of manufacture thereof
Cong Yue Qiao, Menominee, MI (US); and David M. Doll, Fort Worth, TX (US)
Assigned to L.E. Jones Company, Menominee, MI (US)
Filed by L.E. Jones Company, Menominee, MI (US)
Filed on Apr. 29, 2021, as Appl. No. 17/243,821.
Prior Publication US 2022/0349487 A1, Nov. 3, 2022
Int. Cl. F16K 25/00 (2006.01); B22F 3/12 (2006.01); B22F 3/24 (2006.01); B22F 5/00 (2006.01); F01L 3/02 (2006.01)
CPC F16K 25/005 (2013.01) [B22F 3/12 (2013.01); B22F 3/24 (2013.01); B22F 5/008 (2013.01); F01L 3/02 (2013.01); B22F 2003/248 (2013.01); B22F 2301/10 (2013.01); B22F 2301/15 (2013.01); B22F 2301/35 (2013.01); B22F 2302/40 (2013.01); F01L 2301/00 (2020.05); F01L 2303/00 (2020.05)] 16 Claims
OG exemplary drawing
 
1. A powder admixture useful for making a sintered valve seat insert, the powder admixture consisting of a first iron-base powder in an amount of 40-60 wt. %, a second iron-base powder in an amount of 20-40 wt. %, up to 20% Fe powder, up to 3% Cu powder, up to 2% MnS powder, and up to 2% die lubricant, wherein the first iron-base powder has a higher hardness than the second iron-base powder, the first iron-base powder consisting of, in weight percent, 1-2% C, 10-25% Cr, 5-20% Mo, 15-25% Co, 30-60 wt. % Fe, up to 1% Mn, up to 1% Si, up to 5% Ni, up to 5% W, up to 2% V, up to 0.5% B, up to 0.1% P, up to 0.1% S, up to 0.5% N, and up to 5% Nb, and the second iron-base powder consisting of, in weight %, 1-1.5% C, 3-15% Cr, 5-7% Mo, 3-6% W, 1-1.7% V, 60-85% Fe, up to 1% Mn, up to 1% Si, optional Ni, optional Co, and optional Nb.