AISI S7 ESR

S7 ESR tool steel is specifically designed for use in molds and other applications where a highly polished or a very smooth finish is required. The ESR (Electro Slag Remelt) process removes most of the non-metallic inclusions in the steel. S7 ESR double melt's relatively low carbon level, fortified chemistry, ultra-clean, uniform, and homogeneous internal structure make it superior to the other conventionally manufactured shock- resisting tool steels. The following charts show microcleanliness ratings of ESR tool steels by ASTM E45, Method D:

The quality control of the S7 ESR process assures the exceptional cleanliness throughout by removing most harmful inclusions in the material (such as, oxides, nitrides and sulf ides). The ESR steel produced will reflect a mirror like surface condition, subsequently reducing friction giving you easier ejection of parts, the elimination of minute scratches, and other stress-raisers that could lead to premature die failures.

The higher quality steel produced by special melt practices imparts a most important >characteristic—freedom of inclusions and other imperfections. Other advantages include: cleanliness, stability, improved mechanical properties, structures relatively free from segregation resulting in less cracking, and quality assurance by ultrasonic testing of all ESR material produced.

ANNEALING (C)

When properly annealed, this steel has a machinability rating of 95 as compared to a 1% carbon steel rated at 100.