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 Round Bar Sheet Plate Supply Range | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Specification | Surface | |||||||||||||||||
| Round Bar | Diameter:8-1000mm; Length: Can be customized Other specifications can be customized. | Black Surface/Bright Surface /Grinded/Peeled/Turned As per given requirements | |||||||||||||||||
| Sheet/Plate/Slab | Thickness: 2-600mm; Width: 200–2200mm; Length: Can be customized. Other sizes of S7 steel per customer's requirements. | Black Surface/Bright Surface /Grinded/Peeled/Turned As per given requirements | |||||||||||||||||
S7 Steel Grade Equivalent Chart
| Country | USA | German |
|---|---|---|
| Standard | ASTM A681 | DIN EN ISO 4957 |
| Grades | S7/T41907 | 1.2355/50CrMoV13-15 |
S7 Steel Chemical Composition
| Grade | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | V (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| S7 | 0.45-0.55 | 0.20-0.90 | 0.030 | 0.030 | 0.20-1.00 | 3.00-3.50 | ≤0.35 | 1.30-1.80 |
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 |
Hot Sale Products
S7 Steel Application
What Is S7 Steel Used for?
- Punch
- Forging Die
- Hammer
- Chisel
- Cutting Tools
- Small Plastic Molds
- Gripper Dies
- Swaging Dies
- Shear Blades
- Hot Work and Cold Work Mold
- Blanking Dies
- Drills
- Drill Plates
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.
Our Advantage
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.
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.
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.
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.
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.
