AISI S7 Tool Steel
S7 Tool Steel is a shock resisting tool steel with excellent toughness, high strength and medium wear resistance. Due to its maximum shock resistance and high compression strength, it has good deformation resistance and retains good toughness during use. this grade can be machine easily in the annealed condition and it can be heat treated. When quenched in air this material exhibits minimal distortion on hardening. S7 has medium hot work characteristics, making it a tool steel used for both cold and warm shock applications, as well as molds that require high hardness.
Shock resisting tool steels are available in a number of grades. They are typically selected based on the particular combination of properties required for a specific application. S7 provides an excellent combination of properties with a hardness and wear resistance that is slightly less than S5 making it an excellent general impact resisting steel for a wide range of applications.
Supply Range of AISI S7 Tool Steel
S7 Steel Round Bar: diameter 8mm – 1000mm
S7 Steel Plate: thickness 2mm –600mm x width 200mm – 2200mm
Other sizes of S7 steel per customer’s requirements
Surface Finish: Black, Rough Machined, Turned or as per given requirements.
Process: Hot rolled, Forged, Cold drawn etc.
AISI S7 Steel Chemical Composition
| C | Mn | Si | Cr | Mo |
| 0.5 | 0.75 | 0.25 | 3.25 | 1.4 |
S7 Tool Steel Properties
S7 is typically bought to meet chemistry requirements rather than physical requirements. For that reason, physical properties are generally not provided unless requested prior to production. Any material can be sent to a third party after production to be tested for physical properties.
Heat treatment of S7 Tool Steel
1. Forging: Preheat 1200°-1300°F. Forge at 2000°-2050°F. Stop at 1700°F and cool slowly.
2. Anneal: Heat slowly to 1500°-1550°F, cool slowly to 1000°F, air cool. Brinell 197 max.
3. Stress Relief of Unhardened Material: When desirable to relieve the strains of machining, heat slowly to 1050°-1250°F, allow to equalize, then cool in air.
4. Hardening:
Preheat: Warm slightly before charging into the preheat furnace 1200°-1300°F, prior to hardening.
Harden: 1750°F. Quench in air if cross section is 2-1/2″ or smaller; sections 2-1/2″ to 6″ should be oil quenched to black (1000°F) followed by air cooling to 150°F. Larger cross sections should be oil quenched to 150°F.
Quench: Quench in still air or dry air blast.
Temper: Double temper one hour per inch of section thickness to desired heating rate of 2 hours per inch. Cool in air to room temperature between the two tempers. Suggested: Cold working applications 400°-500°F. Hot working applications 900°-1000°F.
Applications of ASTM S7 Tool Steel
Recommended for cold work tools that require resistance to high impact and shock loading, such as shear blades, swaging dies, gripper dies, chisels, and punches.
Typical applications for S7 Tool Steel include:
– Bull Riveters
– Chisels
– Concrete Breakers (Moll Points
– Riveting Dies
– Shear Blades
– Swaging Dies
– Powder Metal Dies
– Notching Dies
– Dowels
– Drills
– Drill Plates
– Hubs
– Plastic Mold Dies
– Cold Forming Dies
– Blanking Dies
– Bending Dies
– Master Hobs
– Punches
Contact
If you have any S7 Tool Steel inquiries and questions for Price, Application, hot treatment, Please don’t hesitate to contact us.
Email: Jack@otaisteel.com
Tel: +86-769- 23190193
Fax: +86-769-88705839