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S7 Tool Steel Round Bar Sheet Plate Material

AISI S7 tool steel be made of chromium-molybdenum alloy to satisfy the needs of high impact toughness. The chemical composition of Cr is quite high. So it has good tempering resistance, high-temperature oxidation, wire-electrode cutting property and impact toughness. After annealing softening treatment, the rolling steel bar must take the process of heating before the use. Because of the higher toughness and high-temperature oxidation, S7 steel material is widely used in the plastic mold, cold work and hot work tools that working in the high temperature and impact condition.

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.

S7 Steel Grade Equivalent Chart

S7 Steel Chemical Composition

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.

S7 Steel Round Bar Sheet Plate Heat Treatment

Annealing
Start by quickly heating to 1500 to 1550°F and hold at that temperature for an hour and a half. It is then slowly cooled to 1000°F followed by air cooling, this is for optimum processability. This annealing procedure should produce a maximum Brinell hardness of 197.

Stress Relief S7 Steel Material: When required to relieve machining strain, heat slowly to 1050°-1250°F, allow to equalize, then cool in air.

Hardening
Preheating: Before hardening, S7 steel is heated slightly before being loaded into a preheat furnace at 1200°-1300°F.
Hardening: 1750°F. Air quench if cross section is 2-1/2″ or smaller; 2-1/2″ through 6″ sections should be oil quenched to black (1000°F) then air cooled to 150°F. Larger Cross-sections of S7 steel shall be oil quenched to 150°F.

Quenching
Quenching in still or dry air.

Tempering
Tool steel S7 is typically tempered for one hour per inch of section thickness to achieve the required heating rate of 2 hours per inch. Cool in air to room temperature between states. Tempering temperatures vary according to intended use. Recommended: 400°-500°F for cold work applications. Thermal processing applications from 900°-1000°F.

Forging
First preheat to 1200°-1300°F, forge at 2000°-2050°F, then stop at 1700°F and cool slowly.

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