2.high carbon and chrome
5.resist to high tempreture
1.used to be as thick plate
2.long usage longevity
4. have good thermal conductance
Similar grade: AISI-P20 ,618,M202,PBD25, SCM4
Hardening : 1050 - 850 u00b0C (oil)
Square/Round Bar: 12~ 500mm
Flat: thickness,20~ 500mm , width, 500mm , 600mm , 700mm , 800mm , 900mm , 1000mm , 1200mm , 1500mm , 1600mm , 1800mm , 2000mm .
Heat slowly and uniformly to 1050u00b0C. Do not forge below 930u00b0C. After forging cool slowly.
P20 should always be annealed after forging and before rehardening. Heat uniformly to 770/790u00b0C. Soak well and cool slowly in the furnace.
Heat uniformly to 840/870u00b0C until heated through. Quench in oil.
Heat uniformly and thoroughly at the selected tempering temperatures and hold at heat for one hour per 25 millimetre of total thickness.
Moulds machined from pre hardened P20 may be nitrided to give a hard surface which is very resistant to wear and erosion. A nitrided surface also increases the corrosion resistance. The surface hardness after nitriding at a temperature of 525u00b0C in ammonia gas will be approximately 650HV.
Product Specification / Models
Tufftriding at 570u00b0C will give a surface hardness of approximately 700HV. After 2 hours treatment the hard layer will be approximately 0.01mm
Flame & Induction Hardening:
P20 can be flame or induction hardened to a hardenss of 50 to 55 HRc. Cooling in air is preferable. Smaller pieces may however require forced cooling. Hardening should be immediately followed by tempering.
Hard Chromium Plating:
After hard chromium plating the steel should be tempered for approximately 4 hours at 180u00b0C, in order to avoid hydrogen embrittlement.
In order to maintain maximum surface hardness P20 may be case hardened. Before case hardening is carried out the steel should be annealed. To carburise, pack with carburising powder into a cast iron or heat resisting steel box and see that the articles are separated from the sides by at least two inches of carburising powder. Lute the lid with fireclay. Heat to the carburising temperature of 880u00b0C and soak for sufficient time to give the required depth of case. Cool to 800/820u00b0C and quench in oil. Tempering will then be necessary. Reheat to 200/300u00b0C and allow to cool in the air to give a final surface hardness of Rockwell C55/59
Firstly heat to approximately 400 to 500u00b0C. Weld at approximately 400 to 500u00b0C and stress relieve. Use Chromium-Nickel-Molybdenum alloyed basic electrodes for welding of structural steels. Welding may also be carried out using an austenitic stainless steel electrode. In this case the stipulated increased working temperature may be modified, but the weld metal has a lower strength than the parent material
Application / Models
Typically used for relatively low temperature applications such as die casting dies and injection molds.Suitable for a wide range of injection moulds, blow moulds and extrusion dies for plastic.
P20 is a pre hardened high tensile tool steel which offers ready machineability in the hardened and tempered condition, therefore does not require further heat treatment . This eliminates the risks, cost, and waiting time of heat treatment thus avoiding the associated possibility of distortion or even cracking. Subsequent component modifications can easily be carried out.
We are an enterprise which can produce and process all kinds of mold steels independently. Founded in October 1999,We can offer forging service. Our steel reaches international quality standards,