Detailed
AISI S7 Tool Steel | 1.2355 | 50CrMoV13-15
1.CHARACTER
In tool steel standard ASTM A681, shock-resisting tool steels are designated as group S steels according to the AISI classification system. S1, S2, S5, S6, and S7 are the types of shock-resisting tool steels.
S7 tool steel is a shock resisting tool steel with excellent toughness and high strength, along with medium wear resistance. It has maximum shock resistance and high compression strength, which gives it good deformation resistance in use, while retaining good toughness.
2.S7 Steel Grade:
Country | USA | German |
Grades | S7/T41907 | 1.2355/50CrMoV13-15 |
S7 Tool Steel Chemical Composition(%):
Steel Grade | C | Si | Mn | P | S | Cr | Mo | V |
S7/T41907 | 0.45/0.55 | 0.20/1.00 | 0.20/0.90 | ≤0.030 | ≤0.030 | 3.00/3.50 | 1.30/1.80 | ≤0.35 |
1.2355/50CrMoV13-15 | 0.45/0.55 | 0.20/0.80 | 0.50/0.90 | ≤0.030 | ≤0.020 | 3.00/3.50 | 1.30/1.70 | 0.15/0.35 |
3.SUPPLY RANGE:
Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.
Forged Round Bar: 20mm - 650mm (Dia)
Rolled Bars: 12mm - 360mm (Dia)
Forged flats: 30-400mm(T)*500-1200mm(W)
Rolled flats: 10-360mm(T)*30-1020mm(W)
Other sizes of O1 material or as per customer’s requirements.
4.AISI S7 Tool Steel Heat Treatment
ANNEALING:
-Heat to 1550F (840C), hold 2 hours, slow cool 50F (30C)/hour maximum) to 1000F (540C), air cool.
-OR
-Heat to 1550F (840C), hold 2 hours, cool to 1400F (760C), hold 4 hours, air cool to room temperature. Typical annealed hardness: 187/220 BHN.
Hardening
- Preheat: Warm steel S7 slightly before charging into the preheat furnace 1200°-1300°F, prior to hardening.
- Harden: 1750°F. Quench S7 tool steel 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 of S7 steel should be oil quenched to 150°F.
- Quench: Quench in still air or dry air blast.
- Temper: Tool steel S7 is normally tempered 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. The tempering temperature varies according to the intended use. Suggested: For cold-working and similar applications, the recommend400°-500°F. Hot working applications: apply a tempering temperature of 900°-1000°F. Never temper at less than 400°F.
5.Applications of S7 Tool Steel
Because of its unusual combination of properties, S7 tool steel is suitable and versatile for a wide range of tool and die applications. AISI S7 Steel can be used for hot and cold shock applications, medium hot-work dies and medium-run cold work tools and dies.
Other uses include: Bull Riveters, Concrete Breakers (Moll Points), Riveting Dies, Powder Metal Dies, Notching Dies, Dowels, Drills, Drill Plates, Hubs, Plastic Mold Dies, Cold Forming Dies, Blanking Dies, Bending Dies, engraving dies, machined cavities for plastic molding dies, die-casting dies, shear blades and Master Hobs.
