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How to choose the Injection Mould Steel?

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How to choose the Injection Mould Steel?
Click number:- Release time:2019-08-09

injection mold steel

When new product development requires Injection Molding, product designers and engineers should consider not only thermoforming or thermoplastic resins, but also the choice of steel for Injection Mould.

The choice of Injection Mould steel will affect production lead time, cycle time, finished product quality and cost. To help you determine which one is best for your next project, check out our most

Common types of tool materials and the advantages and disadvantages of each material.


The P20 is a reliable semi-hardened tool steel and is the type we use most often.


With good dimensional stability, pre-hardened steel can meet the needs of general use. The mold life can reach 50W mode. If necessary, it can be processed well and can be easilySolder

to repair the mold. Can withstand higher injection and clamping pressures. P20 performs much better in glass-filled materials.


There are some plastic resins like PVC which are chemically corrosive. P20 steel is not very resistant to these so this can impact tool life.


NAK80 is another semi-hardened tool steel for demanding applications.


It is more rugged than the P20 and is also faster to machine. It has tight tolerances and does not require stress relief even after a 250K cycle. It is also more resistant to corrosion.


The potential drawback is that it has poor heat transfer and therefore requires more careful cooling and will cost more than AL-7075 or P20.

Best For

Engineering grade plastics such as Delrin or acetal (POM), corrosive resins, high volume production with high clamping pressure, glass fiber resin.



 Another best option for high volume production orders or the use of aggressive plastics is H13 air hardened tool steel.




 This is considered to be "hot worked" steel, which means it has excellent stress resistance to continuous heating and cooling cycles while maintaining tight dimensional tolerances. When the metal is relatively soft, H13 


Easy to process before heat treatment. After heat treatment, the mold is further processed and finished using EDM and hard processing techniques. H13 can be used one million times or more per mold. It can also be used

Mirror polished for transparent or optical components.



Its disadvantage is that it only has an average heat transfer capacity and is more expensive than the P20. 


 Best For

Aggressive resins, optical parts made of clear plastic like acrylic or polycarbonate, high volumes. 




S136 is a high purity stainless steel with different hardness.




When infused with PVC or POM plastic, it is the most resistant to corrosion and may devour other metals. In addition, it can be polished to the highest degree, ideal for transparent plastics such as polycarbonate and propylene

An optically transparent surface is formed in the olefin resin.




These advantages will be offset by the highest cost and lowest thermal efficiency of our available tool materials.


 Best For


Optical grade transparent resin such as PMMA, PVC, PP, PC. When surface treatment is the primary consideration, we recommend using this steel.


HKY Mould is an Injection Muold Company In China,We make plastic Injection Molding tools and dies from S136H, 2316H, H13,2316H, P20, 8407 (hardened) and NAK80 (hardened). Additionally, we offer standard SPI finishes, EDM texturing and aRange of etched textures.

Contact Us

TEL: 0086-755-23573733


Adress: Room #102, Building #50, Shu Tianpu Xin xing Industry Zone B, Matian Street, Guang Ming District, Shen Zhen city, Guang Dong Province, China, 518101.

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