#1
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Jonathan Lange
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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!
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#2Zoltan Bakos
Hi 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)Regards: Zoltan
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#3Haijun XIE
Hi Bro, I do not agree with Zoltan, I think he is not a professional at least not a tool guy, As far as I know, all these three types are pre-harden steel, no more heat treatment. (718H&P20H---HB 330-370, S136H--HB 290-330), 718H is a improved steel based on P20H, both are common used in plastic and die tools, while S136 is a high purity, high optical finishing, anti-corrosion steel, usually used for high polishing, like clear part, Lens, etc.
These steel are easily available from our like ASSAB suppliers, and steel certification can be supplied.
Thanks
Haijun
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#4Jonathan Lange
Hello, thanks a lot for your answers- but this exactly is my problem. I've heard too many different opinions from different sides! And no reliable information on internet.
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 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."
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#5Jonathan Lange
...any other opinion?
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#6Zoltan Bakos
Hi Jonathan, and Haijun,
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.; 718= 1.; 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.
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#7Michael Lee
To get the specifics for each you should refer to the DIN standards for each. But, generally speaking P20 (1./1.) has been used for years as cavity/core material in injection molds for short to medium life expectancy- up to a few 100,000 shots-pre hardened, HRC 28-32- machinable with normal cutting tools. 718/718HH (1.) similar to P20 but slightly harder--up to around HRC38- still machinable with normal cutting tools, longer life expectancy but not subject to brittle fractures like hardened tool steels. S136 is a variation or modified Stainless Steel similar to 420SS with a hardness of around HRC50-52. Much more time consuming to machine and more costly to process than 1. or 1., but will have an extended lifetime and is corrosion resistant. Especially good for for hi gloss requirements and longer life tools where you are using abrasive materials or have poor water conditions which will corrode the waterlines in 1. or 1. quite readily.
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#8Manish jindal
Hello sir,We are traders of tool & alloy steels, Kindly suggest the best mould steel co. in china.
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#9jet
if we order the molds for 718H/718 material how can we assure or terst after mold is ready for trial ? is there any laboratory in china ? or what is process ? please response immediate.
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#10Mahesh
Hi Jonathan and Zoltan,
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.
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#11Pat
Is S136 Heat treated again
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#12Pat
Is S136 Heat treated again after machining
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#13SAHIL
IF WE ARE USING CHINA P-20 FOR CORE AND CAVITY IS THERE ANY PROBLEM IN THAT..........?
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#14salah
dear friend
hello i need to make rubber mould wich material is better
p20 718
thank you
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#15rakesh singla
sir, mu question is the difference between H13 AND S136 STEEL AND WHICH IS BETTER STEEL TO FORM MEDICAL DEVICE LIKE TEST TUBE MOULDS
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#16Empos
I am quoting a mould in china and they quoted S136 with HRC 58-52 , warranty 1 million shots. Is it ok ? I will appreciate your comments
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#17TC Ow
I have few molds which make it for home appliance products. And the resin of the product is PA66 GF30 King Fa.
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.
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#18vivek
If thermal expense coefficient affect the dimension wile heating, the mold is suddenly cooling after the injection process may cricking the mold.
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#19Tomás
Hey Guys,
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, steel and P20.
Could you tell me which is the most suitable for my mold?
Thanks!
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#20Sadam
Hello
Please I need a help.We need to produce rubber mould please which material is better for mold
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#21Abdul Aziz
We make our glasses frame from pc material. So if we use S-136 for our mould how would it be different from the normal mould that we use?
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#22vivek
The steel quality of the molding components has a direct influence on mold quality and service life, and determines the appearance and quality of a plastic injection molded product, so plastic injection mold making factory must make careful selection. Generally speaking, materials have to be selected based on contract stipulations, client requests, as well as product / mold requirements and characteristics.
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:
Overview:The P20 Mold Steel is a type of mold welding consumable, and the earliest is P20, followed by P20H and P20Ni. The P20 Steel is applicable to the production of molds for plastic materials, as well as those for diecasting low melting point metals. This steel material features great machinability, as well as mirror polishing properties.
Chemical composition&#;
Element C Si Mn Mo Cr Ni &#;%&#; 0.28~0.40 0.20~0.80 0.60~1.00 0.30~0.55 1.40~2.00 0.80~1.20
How to Use: The P20 Steel is pre-hardened to 285-330HB (30-36HRC), which is equivalent to 618 of Sweden and GS- of Germany. It can be directly used for molding, and boasts a great dimensional stability. Pre-hardened steel is able to meet the requirements for general applications, with a mold service life of up to 500,000 cycles.
Characteristics&#;
Purposes&#;
Overview
The 718 Mold Steel, known as 3Cr2NiMo in China, is an enhanced steel on the basis of P20 (3Cr2Mo). The quality of the steel material has been so greatly improved that it is able to compensate for the weaknesses of the P20 Mold Steel, and at the same time meet the requirements that are beyond P20. Among today&#;s mold steel materials in China, there is also P20+Ni, in addition to the above-mentioned Chinese standard steel grades. The 718 and 718H (ASSAB) from Sweden; the PX5/PX4 (DAIDO Special Steel, Japan); the GS-711, GS-738, GS-312 and GS-318 (Thyssen, Germany); and the M238 ECOPLUS (BOHLER) from Austria are the most widely used general-purpose mold steel grades for molding plastic materials. It is often referred to as an &#;advanced&#; plastic mold steel that always serves as a benchmark for newly developed mold steels.
Purposes
The purpose of the 718 Mold Steel is the same as that of the P20 Mold Steel, but by virtue of its better hardenability and superior performance, it is able to be used for production of the forming parts of large-sized and high-end plastic molds.
Chemical composition
Element C Si Mn Mo Cr Ni &#;%&#; 0.28~0.40 0.20~0.80 0.60~1.00 0.30~0.55 1.40~2.00 0.80~1.20Hardening
In order to improve the mold service life to more than 800,000 molding cycles, the pre-hardened steel can be further hardened by quenching and low temperature tempering. Before quenching, pre-heat the steel under 500-600°C temperature conditions for 2-4 hours, then keep the temperature at 850-880°C for a certain period of time (at least 2 hours), oil-cool it to 50-100°C, followed by air cooling, and the hardness can reach up to 50-52HRC after quenching. To prevent cracking, immediately perform low-temperature tempering at 200 °C, after which, the hardness can be kept over 48HRC.
Nitriding
Nitriding helps obtain a high-hardness surface structure, after which, the surface hardness can reach up to 650-700HV (57-60HRC), and the service life of the mold is able to exceed 1 million cycles. The nitrided layer features a compact structure and smoothness, with improved ejection performance, as well as resistance to moisture and alkaline solutions.
Overview
H13 is a hot work steel, and the grade is 4Cr5MoSiV1; an alloy tool steel is formed by adding alloying elements on the basis of the carbon steel. Among them, the alloy tool steels include: measuring and cutting tool steels, steel for impact resistant tools, cold work mold steel, hot work mold metal, non-magnetic mold steels, and plastic mold steels.
Chemical composition
Element
C
Si
Mn
Cr
Mo
V
P
S
&#;%&#;0.32~0.45
0.80~1.20
0.20~0.50
4.75~5.50
1.10~1.75
0.80~1.20
&#;0.030
&#;0.03
Heating
After heat treatment, the top hardness of the H13 mold Steel reaches up to HRC52. When the minimum size of a part is greater than 300mm, the hardness after heating should be kept within HRC50.
Characteristics
As an electroslag heavy-duty steel, it boasts high hardenability and thermal crack resistance. The steel contains a high content of carbon and vanadium, allowing it to have a great wear resistance, but a relatively weaker toughness. Other features include great heat resistance, outstanding strength and hardness at high temperatures, as well as high wear resistance and toughness, excellent mechanical properties and high resistance to tempering.
Other designations that are equivalent to H13 Mold steels include:
Purposes
It is used for the production of forging dies with a high impact load, hot extrusion dies, precision forging dies; as well as die-casting molds for aluminum, copper and their alloys.
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