S 7 maximum working hardness is bhn 615 rc 58 s 7 incapable of meeting astm a681.
S7 tool steel machinability.
Typical annealed hardness is bhn 187 220 rc 10 18.
S7 shock resisting tool steel is an air or oil hardening tool steel that is characterized by very high impact toughness.
Aisi s7 tool steel is a shock resistant air hardening steel.
Compare grades using mechanical properties including abrasion resistance toughness size stability machinability and grindability.
It has a relatively low carbon concentration compared to d2 and a2 steels 0 45 0 55 and significantly less chromium 3 00 3 50.
S7 tool steel is a shock resistant grade containing high impact properties.
S7 tool steel is a versatile formulation suitable for both cold and hot work service.
Note that a material with a machinability rating less than 100 would be more difficult to machine than b 1112 and material with a value more than 100 would be easier.
Air hardening and versatile enough for use in both cold and hot work tooling make s7 suitable for a wide range of applications that require shock resistance size stability and machinability where temperatures of the tool will not exceed 1000 f.
As an air hardening grade s7 is stable for heat treatment and its combination of high machinability and dimensional stability makes it ideal for a variety of different tool and die work.
Recommended rc 55 56 to help prevent chipping.
The machinability rating is determined by measuring the weighed averages of the normal cutting speed surface finish and tool life for each material.
S 7 has a machinability rating of about 75 of a 1 carbon tool steel.
S7 tool steel is a shock resisting grade with superior impact properties combined with high toughness machinability and size stability during heat treating.
Its charpy a test that measures the impact strength is over 200 ft lb.
Tool steel comparison chart compare popular tool steel grades a2 m2 d2 s7 o1 using the chart below.
It features excellent impact and shock resistance and decent resistance to softening at high temperatures.
Aisi s7 steel has exceptional impact properties highest hardenability.
It can be used successfully for both cold and hot work applications.
