Pre Hardened Tool Steel 1.2083H 420H S136H Plastic Alloy Tool Mould Steel Plate

S136 Stainless Tool Steel is a martensitic stainless steel with 12% Chromium which is sufficient to give good corrosive resistance properties. It’s best corrosive resistance is when hardened and surface is ground or polished.It has good ductility in the annealed condition but can be hardened up to 500HB (highest of the chromium grades). Martensitic Grades are known for high hardness and allowances must be made for poor weldability and usually allowances for a final harden and temper treatment. Steel is magnetic and welding is not recommended.

Grades Comparison

Chemical Composition(%)

HEAT TREATMENT:

Soft annealing:
750 to 800°C for about 2 to 5 hours
slow controlled cooling of 10 to 20°C per hour to about 650°C; further cooling in air, max. 200 HB

Hardening:
1000°C to 1050°C
15 to 30 minutes keeping curing temperature
quenching in oil/compressed gas/hot bath
obtainable hardness: 53 - 56 HRC

Tempering:
slow heating to tempering temperature immediately after hardening;
minimum time in furnace: 2 hours per 20 mm part thickness;
Tempering twice is recommended.

Application:

Moulds for corrosive plastic materials such as PVC, recycled polymers etc., moulds for chemically aggressive plastics and plastics containing abrasive fillers, mould inserts, dies and gauges for PVC extrusions, screws and barrels for extruders, moulds for automotive, food, medical and optical industry such as spectacles, compact discs, lenses.

S136H advantages:

1. lower maintenance costs:
After long-term use of the mould, the cavity surface remains the original smooth state. No special protection is required when the mold is operated or stored in wet conditions.
2. lower production costs:
Mold is not due to the impact of cooling water and corrosion, due to a certain cooling cycle, increase mold life. The benefits listed above, combined with the high wear resistance of the S136H, provide low maintenance costs and high life molds for optimum economics. At the same time S136H after "ESR" refining, with pure and subtle organization, the mold has a very good overall mechanical properties, high polishing performance.

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