Choose right mould steel for injection mold makingPlastic injection mould steel

Last year I wrote a post for how to choose the mold steel. Today we will have a few example to help you to choose the mould steel easily.

For the plastic resin such as PP, ABS, HIPS, PS, PC, Nylon and PBT etc.  and mold shot lower than 3,000,000shots.

For export mold, mold in your country for production.

Small common mold core and cavity steel:

For general products such as electronic product enclosure, plastic cup, plastic bottle and plastic bracket etc.We can choose P20 (1.2311) or P20+Ni or P20 Mod, P20 modified.etc. Based on economic consideration and smaller molds( core and cavity block lower than 500x500x200), you can choose LKM 738H.

Large exprot mold core and cavity steel:

If it the core and cavity is too big, especially the mold size is close 1 meter and core and cavity is solid on A, B plate,  you can choose more economical mold steel such as Baosteel SWP20, WY 718H or Baosteel SW718H. If it is nylon with glass fill products without lots of ribs, you can choose the economical steel and chrome plate the steel.

Production mold in China

SEASKYTOOLING take responsibility for the mold core and cavity steel to assure your mold life.

For resin with glass fill (export or non export)

If your production quantities is lower than 10000 shots, you can consider to use China local P20 for core and cavity.

If you could choose H13, 2344 from LKM for core and cavity.

If it is long term production mold and too much glass fiber, you could choose S7 for core and cavity and use P20 for A, B plate, ejection plate of mold base.

For transparent product but it not lens:

You could choose LKM 420(h) for core and cavity. Even if it is SPI A3 finishing, you could choose LKM 420 through hardness steel.

For transparent lens:

SEASKYTOOLING suggest to use stainless trhough hardness steel for core and cavity such as S136(HRC 48-52).

For PVC mold core and cavity:

SEASKYTOOLING suggest to use LKM 2316 (h) for core and cavity, this steel is developed for PVC injection mold.

If you consider the economical selection,  you could choose LKM 2083 with chrome plate.

For very low volume mold core and cavity, lower than 1000shots,

You could choose S50C/1050/1.1730 for core and cavity, but your product should not be mirror polishing.

If it is small mold, please do not mind what steel you could choose, it will not affect a lot of mold cost.

About Hedy Yeh

Major in machinery and tooling in university from 2001 to 2004; Worked for plastic mold design, mold manufacturing and mold and production project management from 2003 to 2008; Working for mold marketing and mold project management from 2008 till now My facebook page