Both flat and round are available in all sizes.
| Carbon | 0.15 min | |
| Chromium | 12 – 14 | |
| Iron | Balance | |
| Manganese | 1 max | |
| Phosphorus | 0.04 max | |
| Silicon | 1 max | |
| Sulphur | 0.03 max |
Forging of 420 Stainless Steel is done by heating it slowly and uniformly at1000°C . Then it is cooled slowlyin the furnace or in a thermoinsulating material.
420 steel is usually supplied in the annealed condition.Forging or hardening makes the 420 steel to get re-annealed.
420 Steel is heated slowly at a temperature of 780°C , then cooled down slowly in furnace at 600°C and then cooled in air.
Stress Relieving is done in order to minimize the distortion .420 Steel is heated to 650°C, then soaked well for minimum 2hours/mm of section and cooled in furnace at 500°C and then cooled freely in the air.In order to relieve machine strains,stabilizing is recommended before finishing the machining,in parts where dies have to be heavily machined.
420 stainless steel is pre-heated to 600-700°C until it is heated through heated and then heated to the final hardening temperature ,i.e., 980-1050°C . A neutral salt bath is made under controlled atmosphere in the furnace or in the vacuum in order to protect the 420 tool component from decarburization.Then it is air cooled or oil quenching is done.
Uniform heating and soaking at tempering temperature is needed for minimum 1hour/25mm of section. Then it is cooled in still air. We recommend double tempering.Tempering to be done at 250°C in order to achieve the steel with the best hardness,corrosion resistance and toughness.
TEMPERATURE°C HARDNESS(HRC)
100 56
200 54
300 52
400 54
500 53
600 34
It varies according to the shape and size of 420 steel. Other factors like type of furnace,medium for quenching etc also matter.rate of heating,rate of cooling and soaking time also vary according to shape and size of 420 steel component.
It needs to be done in good condition using a suitable dressing tool.We recommend wet grinding. If dry grinding is done, then must use a very soft wheel for the same.
With our material,we provide mill test certificate and ultrasonic Ok certificate (Note: Provide only if mentioned before placing the order).
