S7 Tool Steel - DIN 1.2357 - 50CrMoV13-1 - Properties

S7 is a cold work tool steel with high shock resistance and impact strength. S7 can be used for many hot and cold work applications such as punches and dies.

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Drill Rod [DR]

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S7 Tool Steel Standard values

Working hardness: 56 HRC - 60 HRC
Delivery condition: max. 225HB

Chemical composition in %

C

0.450000

0.45

0.550000

0.55
Si

0.200000

0.2

1.000000

1
Mn

0.200000

0.2

0.900000

0.9
P

0.000000

0

0.030000

0.03
S

0.000000

0

0.030000

0.03
Cr

3.000000

3

3.500000

3.5
Mo

1.300000

1.3

1.800000

1.8
V

0.000000

0

0.350000

0.35

S7 Tool Steel Technical Data

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S7 Tool Steel Technical Properties

This tool steel is a general purpose air hardening grade having high impact and shock resistance. It has also a good resistance to softening at moderrately high temperatures. This combination of properties makes it suitable for many hot-work and cold-work applications.

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S7 Tool Steel Applications

cutting tools, cold forming and bending dies, plastic molding dies, shear blades, chisels, rivet sets, punches, driver bolts

Chemical designation: Working hardness: 56 HRC - 60 HRC
Delivery condition: max. 225HB

C

0.450000

0.45

0.550000

0.55
Si

0.200000

0.2

1.000000

1
Mn

0.200000

0.2

0.900000

0.9
P

0.000000

0

0.030000

0.03
S

0.000000

0

0.030000

0.03
Cr

3.000000

3

3.500000

3.5
Mo

1.300000

1.3

1.800000

1.8
V

0.000000

0

0.350000

0.35

This tool steel is a general purpose air hardening grade having high impact and shock resistance. It has also a good resistance to softening at moderrately high temperatures. This combination of properties makes it suitable for many hot-work and cold-work applications.

cutting tools, cold forming and bending dies, plastic molding dies, shear blades, chisels, rivet sets, punches, driver bolts

S7 General Information

S7 is an air hardening tool steel. The medium carbon content combined with moderate amounts of chromium and molybdenum provide the excellent properties which make this steel grade suitable for applications where shock resistance, easy machining as well as medium hot work properties are important. The excellent resistance to deformation during air hardening as well as the easiness of heat treatment are further advantages of this material.


Heat treatment


Annealing

Heat the material uniformly to a temperature of 1508-1562°F (820-850°C), then slowly cool down to 1112°F (600°C) in the furnace at a rate of 50-68°F (10-20°C) and finish the process of by cooling the material further in air.


Stress relieving

To relieve machining stresses, for high accuracy during hardening, first rough machine, then heat uniformly to a temperature of 1200-1250°F (649-677°C) and hold for 2 hours. Finish this off by cool the parts in still air and finish machining.


Preheat the parts to 1200-1300°F (649-704°C), then raise the temperature to 1598-1652°F (870-900°C) hold for 2 hours and cool in still air. Quench and immediately temper after quenching.


Quenching Media
  • Oil (temper as soon as a temperature of 120-150°F (49-66°C) has been reached)
  • Air (this method should be used for parts under 2 inches (50.8 mm) max. thickness)

Tempering

To use S7 for cold work applications, temper the parts at a temperature of 400-500°F (204-260°C), hold the temperature for 1 1/2 to 2 hours and then cool to ambient temperature and temper a 2nd time.

For hot work applications, heat the material to a temperature of 900-1000°F (482-538°C), then hold the temperature for 1 1/2 to 2 hours and cool to ambient temperature. As before it is recommended to temper the parts a second time.

For our tempering diagram, please click here.


Hot working

S7 can be used for hot work applications involving high impact and shock. For hot work tools, temper in the high range up to 1000°F (538°C) but make sure the working temperature of the tool does not exceed 1000°F (538°C).


Cold working

S7 can be used for cold work tools like shear blades, punches and chisels and other tools requiring high shock resistance.


Machinability


Forging

Heat the material uniformly to a temperature range of 1950-2050°F (1066-1121°C). Make sure the temperature does not drop below 1700°F (927°C), reheat as often as needed. Cool small forgings in lime, ashes or other insulating materials. Large forgings should be placed in the furnace which is heated to approx. 1400°F (760°C) and soaked until the parts are uniformly heated through. Finish the process by shutting the furnace off and let the forgings cool down slowly.

Note: This is not an annealing. The forgings should be annealed after forging, for that please see “Annealing” above.


Disclaimer

The data shown here has been compiled with the greatest diligence and is regularly updated with regard to the correctness and completeness of its content. The content is indicative only and should not be taken as a warranty of specific properties of the product described or a warranty of suitability for a particular purpose. All information presented is given in good faith and no liability will be accepted for actions taken by third parties in reliance on this information. ABRAMS Industries reserves the right to change or amend the information given here in full or parts without prior notice.