1.2083 | 420 | S136 | 40X13
- DIN 1.2083 steel is martensitic stainless plastic mold steel. It is equivalent to AISI 420 steel. The steel 1.2083 is a major steel for hot pressing in circulation, 1.2083 stainless steel is generally supplied annealed condition with a hardness < 230HBS(HRC21). It can also be delivered ESR and quenched and tempered to 320 HBS(HRC34).
- Low corrosion, high-alloy, low warpage steel for through hardening with excellent properties for mirror polishing as well as good photoetching, good machinability, high wear resistance and high dimensional stability.
Description
1.2083 Chemical Composition
| standard | grade | C | Si | Mn | Cr | P | S | Mo | V | Ni |
| DIN | 1.2083 | 0.38-0.45 | ≤1.00 | ≤1.00 | 12.5-14.50 | ≤0.03 | ≤0.003 | ≤0.20 | ≤0.10 | ≤0.10 |
| ASSAB | S136 | 0.36-0.45 | 0.90-1.20 | 0.40-0.70 | 13.00-14.00 | ≤0.025 | ≤0.010 | ≤0.20 | 0.25-0.35 | 0.15-0.30 |
Supply Range
Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.
Forged Round Bar: 20mm - 650mm (Dia)
Rolled Bars: 12mm - 360mm (Dia)
Forged flats: 30-400mm(T)*500-1200mm(W)
Rolled flats: 10-360mm(T)*30-1020mm(W)
Other sizes of O1 material or as per customer’s requirements.
Heat Treatment
Stress Relieving
When heavy machining and/or grinding has been carried out, stress relieving is advisable to minimise the danger of distortion or cracking during the subsequent heat treatment. To stress relieve, heat the tools slowly to 650°C, soak for a minimum of two hours per 25mm of section and allow to cool down in the furnace to 500°C then continue to cool freely in air. The tools can then be finish machined, leaving on an allowance for final grinding after hardening and tempering.
Forging
Forge by heating slowly and uniformly to 1000°C. After forging cool slowly in furnace or thermal insulation material.
Annealing
Heat slowly to 780°C. Cool slowly in furnace at a slow rate to 600°C and then cool in air.
Hardening
Pre heat to 600-700°C until heated through. Continue heating the component to the final hardening temperature of 980-1050°C and allow to be heated through. Protect the component against decarburisation by using a neutral salt bath, controlled atmosphere furnace or vacuum. Air cool or quench in oil.
Tempering
Heat the 1.2083 uniformly and thoroughly to the selected tempering temperature and hold at heat for one hour per 25mm of total thickness. Double tempering is recommended. To achieve the best permutation of hardness, toughness and corrosion resistance it is recommended to temper at 250°C.
| Temperature [°℃] | 100 | 200 | 300 | 400 | 500 | 600 |
| Hardness [HRC] | 56 | 54 | 52 | 54 | 53 | 34 |
Applications
1.2083 tool steel is ideally suited for plastic moulds, for acid aggressive plastics, PVC or acetates, and can be used with plastics containing abrasive fillers. It also is suitable to produce components for medical and optical applications, such as spectacles, compact discs, lenses.
