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On August 20,
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What are the characteristics of 718H mold steel? What are the characteristics of P20 die steel? What is the difference between 718 mold steel and P20H mold steel?
A: 718H mold steel, corresponding to Chinai&#;s 3Cr2NiMo mold steel.
**Features**
718H is an improved steel grade of P20H mold steel(3Cr2Mo mold steel). which has greatly improved quality, making it Fill in the shortage of P20H mold steel and meet the requirements of P20H mold steel.
Except that it cannot be used for plastic mold parts with corrosion resistance requirements, it is currently the most widely used mold steel.
The typical grade of the universal plastic mold steel. Commonly referred to as &#;advanced&#;plastic mold steel, newly developed New steel grades often take it as a typical comparison.
B: P20 mold steel is a type of mold welding material, the earliest is P20, by P20H,P20Ni phase Features
1.P20H mold steel has the physical characteristics of uniform hardness, and has good polishing performance and photo-etching. Engraving performance, and P20 mold steel excellent processing performance.
2.P20H die steel is made of pure steel through vacuum degassing refining treatment, which is more suitable for polishing or Etching on plastic mold.
3.The P20H mold steel has been pre-hardened to 285-330HB(30-36HRC). which can be directly used for mold processing without heat treatment, greatly shortening the construction period and saving its operating costs. Good dimensional stability.
4.The physical properties of the P20H mold steel are dense after forging and rolling. Ultrasonic inspection can be used to find that the P20H mold steel has no defects such as pinholes and pinholes.
Note:P20H steel is suitable for making plastic molds and die materials for die-casting low-melting metals.
C: This steel has good machinability and mirror polishing performance.
Difference between 718H mold steel and P20H mold steel
(1)718H=P20H+1% Ni.
(2) The hardness of 718H steel is 4HRC higher than that of P20H.
(3)P20H is generally used as a less demanding plastic mold or plastic lower mold.718H Good polishing performance Generally used as a plastic mold with polishing requirements.
(4) The 718H die steel is in the annealed state at the factory and the hardness is HB290-310.
(5) The 718H is in a pre-hardened state at the factory, and its hardness is HRC28-36.
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Injection molds are complex tools made up of multiple parts that play a critical role in determining the quality and output of plastic products. Therefore, the selection of materials for injection mold processing is crucial and must be based on the specific requirements of the mold and the characteristics of the product production, choosing suitable materials for processing.
Injection molds are specialized tools used to manufacture various plastic products. However, different types of injection molds require different steels for manufacturing and need adjustments in hardness and strength according to specific purposes. In this article, we will introduce commonly used steel grades for injection molds and their characteristics.
&#;. Commonly Used Steel for Injection Molds
1. P20 Mold Steel
P20 steel, also known as 3Cr2Mo steel, is a general-purpose mold steel. It is known for its wear resistance and high hardness. It has good toughness and machinability, but compared to other special steel, its hardness and wear resistance are slightly inferior. P20 steel is a low-alloy corrosion-resistant steel with good comprehensive performance and machinability. It is suitable for manufacturing small to medium-sized injection molds.
2. 718 Mold Steel
Based on P20, 718 steel adds elements like V and Mo to increase hardness and wear resistance, making it good for making bigger injection molds.
3. H13 Steel (4Cr5MoSiV1, SKD61)
H13 steel is famous for its great wear resistance and thermal stability. It is widely used in the injection molding industry. It has high hardness, toughness, wear resistance, and heat resistance. It is suitable for high-pressure and high-temperature applications. It is a hot work mold steel, which is used to make hot work molds, die-casting molds, and injection molds.
4. S136 Mold Steel
S136 steel is a high-quality stainless steel mainly composed of Cr13, known for its high hardness and corrosion resistance. In injection mold applications, S136 steel surfaces are easy to polish, improving the surface finish of injection-molded parts and effectively extending the mold&#;s lifespan.
5. NAK80 Steel
NAK80 steel is a high-quality alloy steel that has excellent mechanical properties and cutting performance. It was developed by DAC (Osaka Special Steel Company) in Japan. NAK80 steel has good corrosion resistance, hydrogen embrittlement resistance, and thermal stability, making it suitable for mold manufacturing, injection molding, and vertical operations. Its surface hardness, wear resistance, and corrosion resistance are superior to H13 steel.
6. Steel
A low-alloy mold steel with good cutting performance and heat treatment properties, suitable for manufacturing plastic molds, die-casting molds, and injection molds.
7. Steel
A high-alloy mold steel with good heat resistance and wear resistance, suitable for manufacturing high-temperature molds, die-casting molds, and injection molds.
8. LG Mold Steel and Mold Steel
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These are suitable for fiberglass molds. They are electro-slag steels with good surface finish and wear resistance, suitable for mirror polishing.
The choice of steel depends on the specific requirements of the injection mold, such as wear resistance, toughness, corrosion resistance, and processing difficulty. Special applications may also require consideration of steel size stability and heat treatment performance.
9. SKD61 Steel
SKD61 steel is a mold steel that is high in heat resistance, high in strength, high in toughness, and easy to process. It has good wear resistance and fatigue resistance, and is suitable for making injection molds, die-casting molds, etc. Because of its excellent properties, SKD61 steel is widely used in the automotive, electronics, and household appliance industries for mold manufacturing.
10. 718H Steel
718H steel is a pre-hardened mold steel with excellent mechanical properties and wear resistance. It undergoes heat treatment before leaving the factory, which reduces secondary processing time and costs. 718H steel is suitable for manufacturing large injection molds, extrusion molds, etc., and is widely used in the production of plastic products, pipe products, etc.
11. 738H Steel
738H steel is a pre-hardened mold steel with excellent mechanical properties and wear resistance. It is suitable for manufacturing large injection molds, extrusion molds, etc. and is widely used in the production of plastic products, pipe products, etc. 738H steel undergoes heat treatment before leaving the factory, which reduces secondary processing time and costs.
12. Steel
steel is a pre-hardened mold steel with excellent mechanical properties and wear resistance. It is suitable for making large injection molds, extrusion molds, etc. It is widely used in the production of plastic products, pipe products, etc. steel has undergone heat treatment before leaving the factory, which can reduce secondary processing time and cost. In addition, steel also has excellent polishing and corrosion resistance, which is suitable for making high-precision injection molds, optical molds, etc.
In addition to the above materials, there are also some special materials that can be used in injection mold processing, such as aluminum alloy materials, ceramic materials, plastic materials, etc. Ceramic materials, because of their high hardness, wear resistance, and temperature stability, are used to produce high-precision injection molds and ultra-high-speed injection molds. Plastic materials, because of their good wear resistance and corrosion resistance, are suitable for producing injection molds with special shapes.
In conclusion, those are the lists of commonly used injection mold steels. Each steel has its own characteristics and applications. In practical applications, the choice of steel depends on product requirements, production scale, etc. In addition, to ensure the lifespan and accuracy of molds, reasonable heat treatment and maintenance are required.
&#;. Principles of Selecting Injection Mold Steel
1. Mechanical Properties of Materials
Mold steel needs to be hard, strong, tough, and wear-resistant so that the mold doesn&#;t deform or wear out easily when you use it a lot, and so it can handle high pressure and high temperatures when you inject stuff into it.
2. Corrosion Resistance
Injection molds come into contact with various chemicals and high-temperature molten plastics during operation. Therefore, mold steel needs to have good corrosion resistance, resistant to corrosion and oxidation.
3. Machining Performance
Mold steel needs to have good machinability, which means it should be easy to cut, mill, grind, and do other machining operations to make complex molds.
4. Cost Consideration
When you meet the above performance requirements, you should also consider the cost of mold steel. This will help you reduce production costs while still meeting quality requirements.
5. Balance of Economy and Efficiency
When choosing mold steel, we need to consider both economy and efficiency. On the one hand, high-quality steel can reduce the frequency of mold maintenance and replacement, thus reducing production costs. On the other hand, the right steel can improve production efficiency and shorten production cycles. Therefore, we need to choose steel that meets production requirements and is cost-effective.
6. Consideration of Mold Environment and Lifespan
The environment and lifespan of the mold are also important factors in steel selection. For molds working in corrosive environments for long periods, you should choose steel that has good corrosion resistance. For molds that need to be precise and last a long time, you should choose high-quality, high-hardness steel.
7. Supplier and Service of Steel
When choosing steel, we should also consider the supplier&#;s service and reputation. A good supplier should provide high-quality steel, professional advice, and thoughtful service, helping us better understand and use steel, improving production efficiency and quality.
8. Influence of Heat Treatment on Mold Steel
Heat treatment is a big deal when it comes to using mold steel. If you do it right, you can get the most out of your steel and make your mold last longer. So, when you&#;re picking out your mold steel, you need to think about how you&#;re going to heat treat it and what that&#;s going to do to it.
9. Correct Use of Mold Steel
After selecting the appropriate mold steel, we also need to understand its correct usage. For example, preheating treatment should be performed before use to prevent mold cracking; maintenance and upkeep should be conducted during use to prevent mold wear; and tempering treatment should be performed promptly after use to improve mold toughness. Correct usage can extend the lifespan of the mold and improve production efficiency.
&#;. Case Analysis: Comparison of S136 and
To better understand the characteristics of different mold steels, let&#;s compare S136 and as examples. S136 is a high corrosion resistant mold steel suitable for working in corrosive environments. It has good wear resistance and polishing properties, meeting the requirements of high precision and high gloss injection molding. However, S136 is relatively expensive, so cost-effectiveness may need to be considered.
is a mold steel with good overall performance, suitable for most injection molds. It has good wear resistance, corrosion resistance, and toughness, meeting the needs of most production requirements. Compared with S136, is more cost-effective, making it more competitive when considering cost-effectiveness.
&#;. Key Points of Injection Mold Maintenance
1. Processing companies should equip each set of molds with a resume card, detailing and recording its usage, maintenance (lubrication, cleaning, rust prevention), and damage situations. This information can help identify damaged parts, the degree of wear, and provide information for problem discovery and solution, as well as the molding process parameters and materials used for the product, reducing mold trial time and improving production efficiency.
2. Processing companies should test the various performances of the mold while the injection machine and mold are operating normally, and measure the final dimensions of the molded parts. Based on this information, the existing condition of the mold can be determined, and the damaged parts such as cavities, cores, cooling systems, and parting lines can be found. Based on the information provided by the parts, the mold&#;s damage status and maintenance measures can be determined.
3. Pay attention to the tracking inspection of several important parts of the mold: the role of the ejection and guiding components is to ensure the opening and closing movement of the mold and the ejection of the molded parts. If any part is stuck due to damage, it will cause production stoppage, so it is necessary to keep the mold ejector pins and guide pins lubricated (using the most suitable lubricant) and regularly check whether the ejector pins, guide pins, etc., are deformed or surface damaged. Once found, they should be replaced promptly; after completing a production cycle, the mold&#;s working surface, moving, guiding parts should be coated with professional rust preventive oil, and special attention should be paid to the protection of the gear, rack bearing parts of the mold and the elasticity of the spring mold to ensure that they are always in the best working condition.
4. Pay attention to the maintenance of the mold surface, which directly affects the surface quality of the product, and focus on preventing rust. Therefore, the selection of a suitable, high-quality, and professional rust preventive oil is particularly important. After completing the production task, the residual injection molding and other deposits in the mold should be carefully removed according to different injection molding materials, which can be removed by copper rods, copper wires, and professional mold cleaning agents, and then air-dried. Avoid using iron wires, steel bars, and other hard objects for cleaning to prevent surface scratches. If there are rust spots caused by corrosive injection molding, use a grinding machine for grinding and polishing, then spray professional rust preventive oil, and store the mold in a dry, cool, and dust-free place.
5. Rust Prevention: Prevent rust caused by water leaks, condensation, rain, fingerprints, etc., on the injection machine mold.
6. Anti-collision: Prevent mold damage caused by ejector pins breaking or not returning to their original position.
7. Deburring: Prevent mold burrs caused by wiping with a cloth, flushing with material, wiping by hand, touching with a water nozzle pliers, or colliding with a knife, etc.
8. Parts missing: Prevent mold damage caused by missing rods, gaskets, etc., during use.
9. Pressure prevention: Prevent mold pressure damage caused by the mold being locked due to residual products.
10. Under pressure: Prevent mold damage caused by excessive pressure protection pressure.
&#;.Conclusion
As injection molding technology continues to advance, so does the field of mold steels. While there are many types of mold steels, the reason special steels are needed for injection molds is because regular steels can warp under high temperature and high pressure, and they don&#;t have good wear resistance, hardness, or cavity surface finish. So, you need steel that has better wear resistance, hardness, and corrosion resistance. Meanwhile, we should also pay attention to the heat treatment and processing technology of mold steel to ensure the quality and service life of the mold. In order to better select and use the commonly used mold steels for injection molding, we need to understand the performance characteristics and application scope of various steels. By comparing the performance parameters and actual use effects of different steels, we can find the most suitable material for the specific requirements of injection mold manufacturing. At the same time, in order to timely adopt more advanced materials and technologies, improve the quality and performance of injection molds, we should pay attention to the development trends and technological dynamics of new steels.
So, to sum up, choosing the right steel is super important when you&#;re making injection molds. If you know what different steels can do and what they&#;re good for, you can pick the best stuff to make your molds out of. That way, your molds will be better and last longer. And if you keep up with what&#;s new and what&#;s happening with steel, you can help make better molds and do new stuff with them.
For more information, please visit 718h steel.