70000 Series Valve Seat | 17D70558

This is a sintered, high speed (tungsten carbide) tool steel, valve seat insert. This material has special additives blended into the matrix which impart high temperature lubrication properties to the valve seat. These lubrication properties are “built-in” throughout, and are not affected by extreme heat or machining. These solid lubricants enable this material to be used in “dry” fuel applications such as propane (LPG) and natural gas. They prevent the “micro-welding” of the valve seat material to the valve face, therefore eliminating the primary cause of valve seat erosion. They also improve the machinability: Your tools last longer and you can cut faster.

Because of the special high temperature sintering and post heat treat processing, this valve seat material has cermet style metal alloy oxides. this gives it superior wear resistance to both pounding abrasive ware at elevated temperatures. These metal alloy oxides are called “cer-met” style because they are similar to ceramic (they do not soften at elevated temperature), but retain the machinability of metal. It is this high tech, new generation processing that allows us to achieve such high, hot hardness without having to put in massive amounts of expensive alloys, which would be required to achieve equal performance. Normal foundry techniques do not allow this type of structure.

This valve seat insert is, therefore, used in engines using diesel, unleaded gasoline, and propane. We have been setting new longevity records in propane and natural gas applications using this seat.

The micro structure of this valve seat insert is a very fine, evenly dispersed mixture of spheroidal refractory alloy carbides, cermet style metal alloy oxides, and solid lubricant residing in a tempered martensitic matrix.

• Powder metal technology allows us to place a special high grade alloy iron (with its natural, tool lubricating graphite rich properties) within a tempered tool steel matrix.
• Because of our special processing, we are able to get very fine, spheroidalized (round shaped), tungsten carbide particles to evenly disperse within the tool steel.
• These sphereoidalized carbides are easier to machine because the tool bit can wedge in-between, with less cutting force and less friction.
• The smaller these “balls” of carbide, the easier it is on your cutting tool, because it will not be hitting any big irregular shaped “iceberg chunks” of carbide.