AISI S7 Steel

AISI S7 Steel

Steel name: AISI S7
Table No.: 1726
Chemical composition in weight %: 0.45-0.55% C, 0.20-1.00% Si, 0.20-0.80% Mn, max. 0.030% P, max. 0.030% S, 3.00-3.50% Cr, 1.30-1.80% Mo, max. 0.35% V
Steel group: Cold work tool steels
Properties: No data
Applications: S-7 is suitable for a wide range of tool and die work where shock-resistance, medium hotwork properties, or for ease of machining due to its unusual combination of properties. Uses include hot and cold shock applications such as rivet sets, chisels, punches, hot headers and gripper dies. Also good for short run dies used in cold-forging, blanking and bending.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: In order to maintain the surface chemistry, S-7 should be hardened in a controlled nuetral enviroment. Preheat 1200° F to 1300° F prior to raising to the hardening temperature of 1725° F, holding at this temperature for a minimum of one hour for up to one-inch thickness and one hour for each additional inch of thickness. Sections of 2 1/2 inch or less should be quenched in still air. Once it reaches 150°, the piece should be tempered immediately.
Tempering: S-7 is usually tempered 1 1/2 hours to 2 hours for each inch of greatest thickness. The tempering temperature varies according to the intended use. For cold working and similar applications, temper at 400°F to 500°F is recommended. For hot applications, temper at 900°F - 1000° F. Never temper at less than 400° F.

Table Tempering Temperature (F) - Hardness (HRC)

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Other Steel Data links
Carbides in Steel
CCT and TTT Diagrams of Steels
CCT and TTT Diagram Calculating Service
Hardenability Diagrams of Steels
Hardenability Calculating Service
Macro Defects in Steel
Metal Etchants
Non-Metallic Inclusions in Steel
Semiconductor Etchants

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