Mold steel 718H and P20,which performance is better?

Both the 718H and P20 are plastic mold steels, but it is quite certain that the 718H.718 is an improved p20 steel, and the corresponding US steel is P20 +Ni.Although 718 USES the same as P20, but 718 has better hardenability and superior performance, it can produce large size, high-grade plastic mold forming parts.

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Delivered Hardness&#;

pre-hardened to HB330-380

Comparable Standard:

WNr.1.

Characteristics:

• No hardening risks
• No hardening costs
• Time saving
• Lower tool costs
• Modifications easily carried out
• Can be subsequently nitrided to increase surface wear resistance and locally flame hardened to reduce surface damage
• Good polishing and photo-etching properties
• Good machinability
• High purity and good homogeneity
• Uniform hardness

Application:

• Injection moulds for thermoplastics
• Extrusion moulds for thermoplastics
• Blow moulds
• Forming tools
• Structural components, shafts

Choosing plastic mold steel is a very important process in mold manufacturing, because the classification of plastic mold are generally on the length of plastic mold by 5 grades, grade1 is over a million times; grade 2 is 500,000-100 million; grade3 is from 300,000 to 500,000; grade4 is from 100,000 to 300,000, grade 5 is 10 million below

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for Grade1 and 2, mold stell require hardness after heat-treatment reaching around HRC50 , because plastic which is easy to wear, could violate the tolerance, so we should select steel heat afetr treatment showing better performance, but also at high hardness of the state has good cutting performance, normally, it can be introduced to choose imported raw materials in the Pearl River Delta.

Usually chosen in Sweden , S136, U.S. 420, H13, Europe, ,,083, or Japan SKD61, DC53 (the original mold for the metal material, the use of special circumstances.) grade 1 steel. In addition, raw plastic materials and the added filler have a great impact on the mold steel choice, especially glass fiber could have a very strong worn impact on the mold cavity surface.

Some plastic materials have acid corrosion, and some added modified enhancer or other agent, such as glass fiber lead to mold damage, so plastic material selection should be considered. There is strong general election corrosive plastic S136, ,420 grade1 steel, then weak corrosive plastic should elect S136, ,420, there SKD61, NAK80, PAK90, 718M. Strong acid plastic material: PVC, POM, PBT plastic material weak acid has: PC, PP, PMMA, PA,

Product appearance of the requirements of the selection of plastic mold material there is also a great impact, transparent pieces and surface requirements of parabolic mirror products, may choose to use the material S136, ,718 S, NAK80, PAK90, 420, high transparency of the mold should choose S136 and 420.

More than meeting the product requirements are from the run, but, are you involved in the demand for the cost of molds? you should also consider price, Take the S136 to compare with , a difference of 55-60 yuan per kilogram, if you choose incorrectly, you may lose much money

Pre-hardened mold steel , there is grade: S136H, H, 718H, 083H, hardness HB270 &#;- 340, 45 die by P20, 718,738,618,,, particularly low for the requirements molds, may have used S50C, 45 # steel, that is, directly in the mold cavity up to do.

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