About Us
Factory Tour
Quality Control
Contact Us
Request A Quote
Home ProductsTool Steel Bar

ASTM A681 Hot Forged Steel Bar Black Iron Block S7 Tool Steel 1.2355 ISO9001

China SHANGHAI UNITE STEEL certification
China SHANGHAI UNITE STEEL certification
I'm Online Chat Now

ASTM A681 Hot Forged Steel Bar Black Iron Block S7 Tool Steel 1.2355 ISO9001

small.img.alt small.img.alt

Large Image :  ASTM A681 Hot Forged Steel Bar Black Iron Block S7 Tool Steel 1.2355 ISO9001

Product Details:
Place of Origin: CHINA
Brand Name: UST
Certification: ISO9001
Model Number: DIA16-800MM
Payment & Shipping Terms:
Minimum Order Quantity: MOQ: 2 ton
Packaging Details: Plastic plugs in both ends, Hexagonal bundles of max 2,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper, PVC sleeve, and sackcloth with several steel strips.
Delivery Time: Within 5-35 days
Payment Terms: L/C, T/T
Supply Ability: USD 1500- 2300/ton
Detailed Product Description
Applications: ASTM A681 S7 Tool Steel Grades: 1.2355/50CrMoV13-15
Model: DIA16-800MM Certification: ISO9001
Origin: CHINA Material: Tool Steel
High Light:

tool steel rod


tool steel round bar

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


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.


  • 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.

Contact Details

Contact Person: Anndy

Tel: +8615502127172

Send your inquiry directly to us (0 / 3000)