5120 Tool Steel - ~1.2162 / 1.7147 - ~21MnCr5 / 20MnCr5

5120 is a cold work, case hardening mold steel with high surface hardness, high core toughness, excellent machinability, good polishabilty and wear resistance.

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5120 Tool Steel Standard values

Working hardness: 58 HRC - 60 HRC
Delivery condition: max. 217HB

Chemical composition in %

C

0.180000

0.18

0.240000

0.24
Si

0.150000

0.15

0.350000

0.35
Mn

1.100000

1.1

1.400000

1.4
P

0.000000

0

0.030000

0.03
S

0.000000

0

0.030000

0.03
Cr

1.000000

1

1.300000

1.3

5120 Tool Steel Technical Data

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5120 Tool Steel Technical Properties

Cold work steel and plastic mold steel. High surface hardness with high core toughness. Exellent machinability, good cold hobbing and polishing properties. The even component strength is a result of the combination of hardened surface and high core toughness.

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5120 Tool Steel Applications

mechanical engineering, jig construction, plant engineering, apparatus engineering, plastic processing, plastic molds, synthetic resin mold tools, base plates, bending bars, guide columns, gear parts, joint parts, shafts, gears, rods, bevel gears, crown wheels, piston pins, camshafts, bolts, pins, cardan joints

Chemical designation: Working hardness: 58 HRC - 60 HRC
Delivery condition: max. 217HB

C

0.180000

0.18

0.240000

0.24
Si

0.150000

0.15

0.350000

0.35
Mn

1.100000

1.1

1.400000

1.4
P

0.000000

0

0.030000

0.03
S

0.000000

0

0.030000

0.03
Cr

1.000000

1

1.300000

1.3

Cold work steel and plastic mold steel. High surface hardness with high core toughness. Exellent machinability, good cold hobbing and polishing properties. The even component strength is a result of the combination of hardened surface and high core toughness.

mechanical engineering, jig construction, plant engineering, apparatus engineering, plastic processing, plastic molds, synthetic resin mold tools, base plates, bending bars, guide columns, gear parts, joint parts, shafts, gears, rods, bevel gears, crown wheels, piston pins, camshafts, bolts, pins, cardan joints

5120 General Information

5120 is a case hardening steel, which is often used for medium but highly stressed parts, for example gears, gear shafts and connecting rods, in the automotive and general engineering industry. It also finds its uses as mold plates due to its surface hardness or resin press molds to process thermoplastics as well as gauges, other measuring tools and auxiliary tools such as clamping tools. This case hardening mold steel can reach a core strength of approx. 145-189 KSI (100-1300 N/mm2).

Heat treatment

Annealing

Heat the work pieces uniformly to a temperature of 1238-1310°F (670-710°C) and finishing the process with a slow furnace cooling.

 

Normalizing

To normalize 5120, heat it to a temperature of 1652-1706°F (900-930°C), then cool the parts in air.

 

Carburization

Heat the material to a temperature range of 1652-1742°F (900-950°C). To choose the right temperature, it is important to consider the temperature, time, medium and equipment as well as the intended process and required microstructure.

 

Intermediate thermal treatment

Heat the 5120 case hardening steel to a temperature of 1166-1202°F (630-650°C) for about 2-4 hours with slow cooling in the furnace.

 

Hardening (core hardening)

Heat to a curing temperature of 1562-1616°F (850-880°C) and quench the material in oil or water (water is being used for simple shaped large components only) to a temperature of 320-482°F (160-250°C).

 

Hardening (case hardening)

Heat to a curing temperature of 1490-1544°F (810-840°C) and quench the material in oil or water (water is being used for simple shaped large components only) to a temperature of 320-482°F (160-250°C).

 

Quenching Media

  • Oil
  • Water (for simple shaped large components)
  • Salt bath

 

Tempering

Temper parts 1 hour per 25/32 inch (20 mm) thickness but a minimum of 2 hours at a temperature of 338-410°F (170-210°C).

For our tempering diagram, please click here

 

Machinability

5120 should be machined in the normalized condition before it is case hardened.

Forging

Forging should be done at a temperature range of 1922-1562°F (1050-850°C), then the material should be cooled slowly in the furnace.

Welding

5120 has limited weldability and should be done before the heat treatment. Preheat the part to 482-662°F (250-350°C), post heat treatment is based on the heat treatment of the base material.

 

Surface treatment

Nitriding

It is not usual to nitride 5120 in its hardened condition as it will result in a loss off hardness.

Hard chrome plating

To increase results in wear and corrosion resistance this steel grade can be hard chrome plated.

 

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.