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Plastic Special Steel Round Tool Steel Bar 40CrMnMoS 8 6 / 1.2311 / 618 Grade

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Plastic Special Steel Round Tool Steel Bar 40CrMnMoS 8 6 / 1.2311 / 618 Grade

Brand Name : UST
Model Number : DIA16-550mm
Certification : ISO9001
Place of Origin : China
MOQ : MOQ: 3 ton
Price : USD 1500- 2300/ton
Supply Ability : 1200 ton/month
Delivery Time : Within 5-35 days
Packaging Details : Plastic plugs in both ends, Hexagonal bundles of max 2,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper, PVC sleeve, and sackcloth with several steel strips.
Production Technique : Hot forged, hot rolled
Delivery condition : Annealed
Inspection : The third party is acceptable
Shape : High-quality Round Bar
Material : Plastic tool steel
Quality Standard : ASTM; DIN; JIS
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P20+S/40CrMnMoS 8 6/1.2311/618 Plastic Special Tool Steel, Tool steel bar


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.

Applications: 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.

Steel Grade:

GB 3Cr2Mo, %

0,28 - 0,400,20 - 0,800.60 - 1,00<= 0,035<= 0,0351,40 - 2,000,30 - 0,55

DIN- 1.2311 , %

0,35 - 0,450,20 - 0,401,30 - 1,60<= 0,035<= 0,0351,80 - 2,100,15 - 0,25

Similar grade: AISI-P20 ,618,M202,PBD25, SCM4

Hardening : 1050 - 850 °C (oil)

Delivery Condition:

Annealed (HB)330~280<=230150~180

Size available:

Square/Round Bar: 12~ 500mm

Flat: thickness,20~ 500mm , width, 500mm , 600mm , 700mm , 800mm , 900mm , 1000mm , 1200mm , 1500mm , 1600mm , 1800mm , 2000mm .

Length: Contracted.

Heat slowly and uniformly to 1050°C. Do not forge below 930°C. After forging cool slowly.

P20 should always be annealed after forging and before rehardening. Heat uniformly to 770/790°C. Soak well and cool slowly in the furnace.
Heat uniformly to 840/870°C 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 525°C in ammonia gas will be approximately 650HV.
Tufftriding at 570°C 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 180°C, in order to avoid hydrogen embrittlement.

Case Hardening:
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 880°C and soak for sufficient time to give the required depth of case. Cool to 800/820°C and quench in oil. Tempering will then be necessary. Reheat to 200/300°C and allow to cool in the air to give a final surface hardness of Rockwell C55/59

Firstly heat to approximately 400 to 500°C. Weld at approximately 400 to 500°C 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.


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