S7 Round

S7 Round


Std. cut tolerance -.00″/+.125″

Due to material handling and processing items may have light scratching. Raw Material is not meant to have a finished cosmetic look

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S7 Round Tool Steel

The S7 grade of tool steel boasts exceptional toughness and resistance. It may be used in applications with moderately elevated temperatures. This grade withstands high impact and is useful for riveting, notching, blanking cold forming, and bending dies; bull riveters, concrete breakers, dowels, drill plates, and hubs.

Heat Treating

Hardening: To harden the S7, heat to 1750°F. For cross-sections 2 1/2″ or smaller, quench in air. Larger sections from 2 1/2″ to 6 ”  should be oil quenched to black (1000°F) followed by air cooling to 150°F. If the cross-section is above 6″, oil quench to 150°F.

Forging: Start by preheating the S7 not more than 400°F per hour to 1200° – 1300°F. Forge at 2000° – 2050°F. Stop at 1700°F and cool slowly.

Annealing: The S7 must be annealed after hot working and before re-hardening. Heat at a rate of not more than 400°F per hour until the metal reaches a temperature of 1550°F. Hold this temperature for 1 hour per inch of maximum thickness or 2 hours minimum. Cool slowly in the furnace at a rate of 50°F per hour until the S7 reaches 1000°F. Continue cooling.

Quenching: Preheat to 1200-1300°F prior to hardening. Quench in air, pressurized gas, or warm oil to 150° – 125°F. 

Tempering: Temper immediately after quenching. Hold at temperature for 1 hour per inch of thickness or 2 hours minimum, then air cool. For cold working applications temper at 400°-500°F. For hot working temper at 900°-1000°F.


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