Factory Price 50CrMoV13-15 Hot Forged Black Iron Block S7 Tool
Steel 1.2355 Flat Bar
We could supply AISI s7 Round Bar, S7 Drill Rod, S7 Rectangular
Bar, S7 Flat Bar, S7 Square Bar and Plate. Welcome to contact us
for more information and ask for a quick quote anytime.
2. Relevant Steel Specification for S7 Tool Steel
| Country | USA | German |
| Standard | ASTM A681 | DIN EN ISO 4957 |
| Grades | S7/T41907 | 1.2355/50CrMoV13-15 |
3. AISI S7 Steel Chemical Composition and Steel Equivalents
| ASTM A681-2008 | C | Si | Mn | P | S | Cr | V | Mo |
| S7/T41907 | 0.45 | 0.55 | 0.20 | 1.00 | 0.20 | 0.90 | 0.03 | 0.03 | 3.00 | 3.50 | – | 0.35 | 1.30 | 1.80 |
| DIN ISO 4957 | C | Si | Mn | P | S | Cr | V | Mo |
| 1.2355/50CrMoV13-15 | 0.45 | 0.55 | 0.20 | 0.80 | 0.50 | 0.90 | 0.03 | 0.02 | 3.00 | 3.50 | 0.15 | 0.35 | 1.30 | 1.70 |
4. S7 Tool Steel Mechanical Properties
S7 Steels
Mechanical Properties
| 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 |
Tool Steel S7
Physical Properties
| Elastic Modulus | 207GPa | |
| Density | 7.83 g/cm³ | |
| Thermal Conductivity | W/m- °K | Cal/cm-s-°C |
| at 95°C | 28.5 | 0.068 |
| Thermal Properties |
| Critical Temperature: | 800c |
| 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 |
5. Forging of AISI Steel S7
Preheat 1200°-1300°F. Forge at 2000°-2050°F. Stop at 1700°F and
cool slowly.
6. AISI S7 Tool Steel Heat Treatment
Annealing
Anneal in a protective atmosphere. Heat rapidly to 1500 to 1550°F
and hold at that temperature for one and one-half hours for each
inch of greatest thickness. To obtain best machining properties,
cool slowly to 1000°F, and then air-cool. This annealing procedure
should produce a hardness of Brinell 197 max.
Stress Relief S7 steel Material: When desirable to relieve the
strains of machining, heat slowly to 1050°-1250°F, allow to
equalize, then cool in air.
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.
7. Machinability of Tool Steel S7
When S7 steel annealed to Brinell 197 max, steel S7 is rated at 95,
as compared to a rating of 100 for a 1.00 pct carbon tool steel.
8. Applications of ASTM A681 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.
