S7 Tool Steel Round Bar Sheet Plate Material

AISI S7 Steel Physical Properties

Physical Properties
Elastic Modulus	207GPa
Density	7.83 g/cm³
Thermal Conductivity	W/m- °K
at 95°C	28.5
Thermal Properties
Critical Temperature	800°C
CTE, linear 20°C	12.59µm/m- °C
CTE, linear 250°C	13.33µm/m- °C
CTE,linear 500°C	14.27µm/m- °C
Transformation Temperature	785 °C

 

S7 Tool Steel Mechanical Properties

Mechanical Properties	Metric
Hardness, Rockwell C (air cooled from 941°C, 649°C temper temperature)	41
Hardness, Rockwell C (air cooled from 941°C, 449°C temper temperature)	53
Hardness, Rockwell C (air cooled from 941°C, 149°C temper temperature)	57
Modulus of elasticity	207 GPa
Charpy impact (V-notch; air cooled from 941°C; 425°C temper temperature)	13.6 J
Charpy impact (V-notch; air cooled from 941°C; 649°C temper temperature)	16.3 J
Charpy impact (V-notch; air cooled from 941°C; 200°C temper temperature)	16.9 J
Machinability (1% carbon steel)	70.0 – 75.0%
Poisson's ratio	0.27-0.30

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. S ested: 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

 

Our Advantage

1.Songshun Steel Manufacturing

With 7000 tons of hydraulic forging press, electric slag furnace and other high-end production equipment, we produce a great variety of steels with the best quality in China.

2.Testing

In order to control the quality, we have complete testing methods to make sure satisfy the customer needs, including Chemical Analysis, Ultrasonic Test and so on.

3.Massive Stock

We keep a mass stock are over 20000 tons for various steel type, including steel round bar, steel sheet, alloy steel, carbon steel, stainless steel, mold steel, steel coil and etc.

4.Customized Service

With a professional steel engineers team, we provide customized service according to your project drawing, also provide professional project experience for your special project, such as materials, processing conditions and etc.

5.World Wide Delivery

For container shipment, standard packing and bundle round bar and flat bar would be applied. It is necessary to fasten & reinforcement would be done to ensure the safety and better unloading at the destination port.

For less than container shipment, wooden box package would be applied for different size materials. For milled or grounded materials, the anti-rust oil would be needed to ensure the surface condition, within the wooden box.songshunsteel1826