Difference between steel mold types P20H, S136H and 718H?
Hello, could someone please tell me the difference and advantage of this 3 molds, I understand this are also the most used types in the Chinese market right now?!
I really would appreciate every comment! Thanks, Jonathan!
there is not a big difference between the 718H and the P20H.
Both is only could used to the standard plastic material moulds which is not agressive and not much filler inside.
The S136H has good corrosion resistance and could used for agressive materials. (after heat treatment)
But we are spoken about China, than you have to pay more attention about the source of these steels. In my experience is that there is very limited source in China which could guarantee the quality of this steel. (mainly only from import source)
These steel are easily available from our like ASSAB suppliers, and steel certification can be supplied.
What I've also heard recently is that P20H is mostly used in US, S136H German and so on.
I've also received another interesting email today, so I just post it here: "718 is one steel material of P20 steel. 718H is harden based on 718. So 718H is also one steel material of P20, just was harden. P20 have both domestic and imported in China.
S136H is better than P20H(718H), it have much stronger corrosion resistance, and more hard. The shot life of S136H mold is much longer than P20H, and that can make the part surface be more nice."
First of all please check the technical information on the ASSAB site and you will agree with my when I mentioned you only could can rely on the Quality if it is imported.
Because if you check thier product under this names you can find the Uddeholm grades from Sweden. (imports)
But you can check it in the internet in different standards like P20=1.2311; 718= 1.2738; S136=Stavax.
If you check the datasheet of the supplier like Uddeholm you will see there is not much difference between the P20 and the 718. Here you can see also information about the heat treatments, machining too. (also for the S136, Stavax)
But the question is how you can be sure what you have ordered and recieved is the same?
This is the challange I thing you are facing now. I'm right?
But also if you are searcing in the internet you can find several comperison table between the different standards and this will help you to find more technical information.
I have a better answer for How you will asure that what you order and received? ??
S136 is plastic mold steel comes under stainless steel family, which having very good corrosion resistant and polishability and in China it is supplied by ASSAB.
ASSAB ( Associative Swedish steel AB)company is importing material from steel mill based in Sweden called as UDDEHOLM.
As per Uddeholm std. This grade name is Stavax ESR. For this you will get Uddeholm mill TC from Assab China.
hello i need to make rubber mould wich material is better
The steel material required by customer is "hardened steel". It is "hardened steel", not a pre-hardened steel.
Unfortunately, I don't have any experience for designing this type of molds.
Hereby, I would like to get everyone's advise for designing the mold. E.g:.
1) What we need to consider during design the mold?
2) What is the tolerance that we need to consider?
3) What we can do & what we can't do?
If anyone of you has the guidelines, please don't mind to share.
I'm currently asking for a mold with 32 cavities for small PVC parts.
I've been given different quotations with three types of steel for core and cavities.
S136, 2344 steel and P20.
Could you tell me which is the most suitable for my mold?
Please I need a help.We need to produce rubber mould please which material is better for mold
Principle for steel selection of molding components: different types of steels need to be selected based on types of plastic, product shapes / dimensions, product appearance / quality / application requirements and production scale, etc., while paying attention to the various material performances like machining, polishing, welding, texturing, deflection and abrasion resistance, and at the same time taking economy and mold manufacturing conditions/process into consideration.
With regard to the plastic molds for production of transparent plastic parts, the mold cavity and core need to select high-grade imported steel materials that boast an outstanding mirror polishing performance, such as 718 (P20+Ni), NAK80 (P21), S136 (420) and H13 steels, among which, 718 and NAK80 are pre-hardened, so preheat is not necessary; S136 and H13 steels are annealed usually with a hardness between HB160 and 200, so vacuumquenching and tempering are needed after rough machining; the hardness of S136 steels is usually between HRC40 and 50, while that of H13 steels is between HRC45 and 55.
With regard to the molds for production of products that have high requirements on surface quality, long service life and large production scale, the material selection for the molding components should be made according to:
With regard to the molds for production of average surface quality products, the molding components may select the following steel materials:
With regard to internal parts that do not have requirements on surface quality, when molding materials do not have special requirements on mold steels, the mold cavity may select low-grade imported P20 or P20+Ni steels, or the high quality imported carbon steels like S50C and S55C, or the domestically produced plastic mold steels; and the mold core may select high quality imported/domestic carbon steels.
For corrosive plastic materials which contain fluorine or chlorine, or the plastic materials that contain various additives like flame retardants, the mold may select imported corrosion resistant steels when the product needs to be manufactured to high requirements, or select domestically produced corrosion resistant steels in case of general requirements.
If the plastic materials produce a strong abrasion or impact effect on mold steel, for example nylon + glass fiber, the mold needs to select imported or domestically produced H13 steels which are highly abrasion/heat/stretch resistant and highly resilient.
For insert molding, the mold may select the same material as the insert. For the mold part that is hard to cool or has high requirements on cooling, the insert materials should choose be-bronze or aluminum alloy.
For the moving parts in a mold, which are involved in molding, the material should be selected according to: