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Tool Steel
420FM
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Technical Datasheet

420FM Tool Steel - DIN 1.2085 - X33CrS16 - Data Sheet

420FM is a martensitic, pre-hardened, corrosion resistant plastic mold steel, which is magnetizable with good machinability due to the addition of Sulphur.

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  2. Standard values
  3. General Information

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420FM Tool Steel Standard values

Working hardness: approx. 33 HRC (delivery condition) - 48 HRC
Delivery condition: max. 330HB

Chemical composition in %

C

0.280000

0.28
–

0.380000

0.38
Si

0.000000

0
–

1.000000

1
Mn

0.000000

0
–

1.400000

1.4
P

0.000000

0
–

0.030000

0.03
S

0.050000

0.05
–

0.100000

0.1
Cr

15.000000

15
–

17.000000

17
Ni

0.000000

0
–

1.000000

1

420FM Tool Steel Technical Data

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420FM Tool Steel Technical Properties

Pre-hardened, corrosion-resistant plastic mold steel. Magnetisable with good machinability. Resistant to aggressive plastics and humid conditions. Further heat treatment is not intended.

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420FM Tool Steel Applications

mechanical engineering, apparatus engineering, plastic processing, injection tools, base plates, assembling parts, molding frames, plastic molds, extrusion tools, valves, steam valves, water valves, fittings parts, pump construction, pump rods, compressor construction, compressor parts, surgical instruments

Chemical designation: Working hardness: approx. 33 HRC (delivery condition) - 48 HRC
Delivery condition: max. 330HB

C

0.280000

0.28
–

0.380000

0.38
Si

0.000000

0
–

1.000000

1
Mn

0.000000

0
–

1.400000

1.4
P

0.000000

0
–

0.030000

0.03
S

0.050000

0.05
–

0.100000

0.1
Cr

15.000000

15
–

17.000000

17
Ni

0.000000

0
–

1.000000

1

Pre-hardened, corrosion-resistant plastic mold steel. Magnetisable with good machinability. Resistant to aggressive plastics and humid conditions. Further heat treatment is not intended.

mechanical engineering, apparatus engineering, plastic processing, injection tools, base plates, assembling parts, molding frames, plastic molds, extrusion tools, valves, steam valves, water valves, fittings parts, pump construction, pump rods, compressor construction, compressor parts, surgical instruments

420FM General Information

As a martensitic steel 420FM is magnetizable, has good corrosion resistance even in humid conditions and when processing aggressive plastics. 420FM corrosion resistant tool steel comes in a pre-hardened condition, has good machinability and high strength without the need for a heat treatment. This steel grade can be used when good machinability with simultaneous corrosion resistance is a priority. 420FM has a good ductility and toughness as well as good dimensional stability.

 

Applications

Applications for this corrosion resistant tool steel include: Blow molds, packaging, electronic industry, measuring gauges, medical and optical instruments. Due to the better corrosion resistance, the maintenance requirement for molds is reduced.

 

Heat treatment

Generally, as this steel grade is delivered in the pre-hardened condition, further heat treatment is not required. The following procedures can be applied if a higher hardness is necessary.

Annealing

Heat the 420FM work pieces uniformly to 1562-1616°F (850-880°C) and hold them for 2 to 5 hours, then slowly cool in the furnace.

Stress relieving

To eliminate surface and/or residual stresses from machining, heat the work piece to 842°F (450°C), then cool down slowly in the furnace. At a higher temperature this steel grade tends to scale.

Hardening

Heat 420FM stainless steel uniformly through to 1832-1886°F (1000-1030°C) and hold it at this temperature for 30 minutes. Then quench the work pieces in oil.

Quenching media

  • Oil
  • Compressed gas (N2)

Tempering

Heat 420FM slowly to a tempering temperature of 392-572°F (200-300°C) after hardening, hold for 2 hours per 25/32 inch (20 mm) thickness. Double tempering is recommended. Slowly cool in the furnace.

For our tempering diagram, please click here

 

Machinability

With the addition of sulphur this steel grade has a good machinability.

Forging

Uniformly heat the parts to a temperature range of 1922-1562°F (1050-850°C), when finished forging cool the work pieces slowly down.

 

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.