Material for lapping tools and lapping surface plate using the same
AssigneeKabushiki Kaisha Toshiba
InventorTakanobu Nishimura
Life of this patent
Estimating the term…
Abstract
A lapping surface plate consisting of an Fe-base material containing 0.8 to 3.5 wt % of C, 1 to 7 wt % of Si, 5 to 15 wt % of Ni, and 1 wt % or less of Mn, the balance substantially being Fe, further containing 0.1 wt % or less of at least one element selected from the group consisting of Mg, Ca, and Ce, and having a graphite structure and a hardness of 250 Hv or more.
Claims11
An Fe-base material for lapping tools, consisting essentially of 0.8 to 3.5 wt % of C, 1 to 7 wt % of Si, 5 to 15wt % of Ni, 0<Mn.ltoreq.wt %, 0<X.ltoreq.0.1 wt % where X equals at least one element selected from the group consisting of Mg, Ca and Ce, 2 wt % or less of Cr, 2 wt % or less of at least one element selected from the group consisting of Mo, Nb, Ti, and V, and the balance of the material substantially comprising Fe, wherein said material in the as-cast condition has a matrix of at least 30% by area of martensite, and includes a plurality of spheroidal graphite, and said material having a hardness value of 250 Hv or more.
A lapping surface plate consisting of an Fe-base material, said Fe-base material consisting essentially of 0.8 to 3.5 wt % of C, 1 to 7 wt % of Si, 5 to 15 wt % of Ni, 0<Mn .ltoreq.1 wt %, 0<X.ltoreq.0.1 wt %, where X equals at least one element selected from the group consisting of Mg, Ca and Ce, 2 wt % or less of Cr, 2 wt % or less of at least one element selected from the group consisting of Mo, Nb, Ti, and V, and the balance comprising Fe, wherein said Fe-base material in the as-cast condition has a matrix of at least 30% by area of martensite and includes a plurality of spheroidal graphite and said Fe-base material having a hardness value of 250 Hv or more.
Dependencies are inferred from the claim text.