DC53 steel is a high-performance cold work tool steel that is the preferred choice in many industries. DC53 steel is also known as an upgraded version of D2 steel due to its improved toughness, machinability, and wear resistance.
DC 53 steel is a preferred choice for many manufacturers because it can maintain its hardness and toughness even after the heat treatment process. It is widely used to manufacture molds and precision parts from the DC53 steel. DC53 meets the requirements for mold, such as the ability to maintain long life, high dimensional accuracy, and consistent production. Similarly, it meets requirements for precision parts by maintaining the sharp edges during the application.
Figure 01: Heavy gauge corner from DC 53 steel
What is DC53 Steel?
DC53 is a cold work tool steel, and it is well known for its strength, durability, heat stability, toughness, and wear resistance. Previously, D2 steel was famous for its high hardness and wear resistance, but the problem arises due to sudden plastic deformation. To solve this issue, DC53 steel was developed by Daido Steel, a famous Japanese steel manufacturer. Their mission was to improve the toughness and machinability while retaining the hardness of D2 steel.
A combination of cold work tool steel materials is grouped, and these materials are used for applications that operate at relatively low temperatures. DC53 steel can be classified among high-performance cold work tool steel with the help of its composition content and heat treatment response. It belongs to the higher carbon and molybdenum content category of cold work tool steel, but with some modification in composition, such as the addition of vanadium.
Chemical Composition
The main reason behind its improved toughness and hardness is its alloying elements. The following table discusses the main role of alloying elements in material properties.
Table 1: Key alloying elements composition and their role in DC53 steel
Elements | Composition content | Role |
Carbon (C) | ~1.00% | Improving hardness & wear resistance |
Chromium (Cr) | ~8.00% | It is a primary carbide former and increases wear resistance, hardness, & hardenability |
Silicon (Si) | ~0.90% | Increase strength, tempering resistance, and heat stability |
Vanadium (V) | ~0.28% | It improves strength and hardenability. |
Molybdenum (Mo) | ~2.00% | It refines grain size and forms hard vanadium carbides. This enhances its toughness and wear resistance. |
Mechanical Properties
The following properties make it superior to use in many industries:
- It has higher hardness, typically ranging between HRC 60–62 after heat treatment.
- It can maintain its hardness even after the high-temperature tempering process.
- It offers high toughness, and this leads to higher resistance to chipping even at the edges as compared to D2 steel.
- It offers excellent reliability under repeated loading.
- It offers minimal distortion and maintains its dimensions after the heat treatment process.
- It offers higher wear resistance and good machinability to reduce the tool wear and production cost.
Key Features and Advantages
The key features and advantages of D53 steel are given below:
- It has better toughness and more energy-absorbing capability than D2 steel. Due to this, DC53 steel reduces the chance of sudden plastic deformation or cracking.
- It offers longer life for tools as well as ensures consistent production results for different applications, such as molds.
- During heating and cooling in heat treatment processes, it shows the minimum distortion, which is required to maintain the dimensional accuracy in precision dies and molds.
- Due to better toughness and machinability, it is easier to reduce the size of components by grinding.
- It ensures consistency in the hardness and strength even after the high-temperature tempering process. So, through this, the performance of this steel can easily be predicted.
- It ensures the resistance of cracking at the edges due to higher durability in extreme stress environments.
Applications of DC53 Steel
In the following applications, it is preferred to use:
- The cold work mold can be made from this steel, and it is used in the forming dies, stamping dies, and shear dies.
- Automotive parts molds can be made through this steel due to the requirements of precision and durability.
- It is excellent for the manufacturing of machinery parts such as cutting tools and blades. In these parts, excellent resistance to the precision of dimensions is required.
- The dimensional stability is required for the electronic mold, especially for connectors and semiconductor leads, which is why DC53 steel is used for this.
- Due to its ability to resist repeated thermal cycles, it can be used in plastic injection molds.
- Its improved toughness reduces the risk of tip breakage for the perforating punches.
Heat Treatment and Processing Guidelines
The performance of DC53 depends on the correct heat treatment methods, followed by machining and surface treatment, for a longer life cycle of the material.
1) Preheating: First, the material is preheated at 600–650°C to avoid thermal shock. Second preheating is done just below the austenitizing temperature range at 850–900°C.
2) Austenitizing temperature: The material reaches the temperature range at 850–900°C, then heat the material in the austenitizing temperature range at 1020–1050°C. Then, hold the material sufficiently at this temperature to dissolve the carbides. If it is too much soaked, this will lead to the formation of excessive grain growth, brittleness, and cracking.
3) Quenching: The DC53 steel is quenched in still air/oil or an inert/nitrogen environment. The pressure of nitrogen gas should not exceed 2 bars to avoid distortion.
Figure 02: Hardening cycle for DC53 steel
4) Tempering: The steel achieved high hardness and internal stress. To reduce the internal stresses in the material, the material is reheated at 520–550°C. The tempering process will lead to maintaining the 60-64 HRC with a drastic improvement in toughness.
5) Machining performance: The grinding and polishing of DC53 steel can easily be done due to its improved toughness. During polishing and grinding, its improved toughness with uniform and refined microstructure reduces the chance of producing small cracks on the surface of the material. Excellent polishing is crucial for plastic injection molds.
6) Surface treatment: There are different methods to make the surface harder and unchanged the core properties of the material. These methods increase the life of the material and fatigue strength by increasing the hardness of the surface. Some of them are discussed below:
- Nitriding: It is a type of surface treatment method in which nascent nitrogen diffuses into the surface. This diffusion increases the surface hardness and fatigue strength. Nitriding only increases the surface hardness, while the hardness of the core remains unchanged. For proper diffusion of nitrogen into the surface, it is recommended to apply the annealing to the material after the nitriding.
- PVD/CVD: Physical or chemical vapor deposition methods can be used to deposit the TiN, TiCN coating on the material. Chemical vapor deposition requires post-heat treatment, while physical vapor deposition does not need this.
- Thermal diffusion coating: It diffuses the carbides into the material at high temperature. This high-temperature diffusion helps the DC53 to resist extremely wear-resistant applications.
Supply, Standards, and Forms Available
The manufactured material can be supplied in various forms such as bars, rounds, and plates. Different international standards are used to achieve consistent properties during manufacturing. This is easily done because these standards provide information related to the composition, mechanical properties, different heat treatment procedures, and dimensional tolerances. Common form, their size range, and international standards of DC53 steel are discussed in the table below:
Table 2: Common forms and standards used for DC53 steel
Form Available | Typical Size Range | Applicable Standards |
Round Bars | Ø 20 mm – Ø 600+ mm | JIS G4404(S-STAR) |
Plates/Sheets | Thickness: 20 – 600 mm | JIS G4404 (S-STAR) |
Flat Bars | 20mm x 20mm – 400mm x 400mm | JIS G4404 (S-STAR) |
Before shipment, different quality checks should be done on the manufactured DC53 steel to ensure its properties. Different characterization techniques are applied to different shape materials, but some common characterization techniques are discussed below:
- OES: Optical emission spectrometry is used to check the composition of carbon, chromium, silicon, vanadium, and other alloying elements.
- Rockwell Hardness test: It is done to ensure the hardness is met according to the requirements of the customer.
- Dimensional accuracy: The dimensional accuracy of the product can be ensured by visual examination or by calipers and micrometers.
- Ultrasonic testing: It is a non-destructive testing method used to detect internal cracks and flaws in the manufactured material.
- Dye penetrant testing: It is also a non-destructive testing method done on the materials to check the cracks on the surfaces and sub-surfaces.
Value-Added Processing Services (What We Offer)
The different value-added processing services ensure that the material is ready for the applications. It is not enough to just supply the material according to the specification mentioned in the standards. The following are the services that we offer to prepare your material for the application:
- The precise cutting services can be provided according to customer drawings. We ensure the dimensional accuracy of your product with tight tolerances.
- We can provide customized milling, turning, and drilling of your product. Our advanced CNC machining setup ensures dimensional accuracy and distortion during machining.
- Heat treatment of material provides hardness, toughness, durability, and wear resistance. We can provide full heat treatment, including quenching, tempering, and stress relief, on ready-to-use parts.
- To extend the service life, surface finishing, and durability of the material, we provide grinding, polishing, and different surface methods, such as nitriding or coating.
Buying Considerations for Procurement Managers
The procurement managers should consider the following factors while buying the DC53 steel for their applications.
1)Key factors affecting price
- It is not enough to just purchase the thicker material for all applications. The thicker materials are more expensive due to more raw material usage and machining efforts.
- The addition of heat treatment services automatically increases the cost of the material. The price of pre-hardened form is expensive as compared to annealed.
- The fluctuation in the price of different alloying elements in the market automatically increases the cost of the steel.
2) Packaging and logistics
During the export of the material, wrapping the material should be used to avoid moisture. Materials should be placed in wooden cases to avoid distortion. Logistic planning, such as the fastest delivery track and lead time, directly impacts the cost of the material. Use digital software and shipments to ensure tracking of the shipment. To avoid the fine, it is important to understand the country’s importing rules to clear the material from the port.
3) Supplier qualifications and certifications
Procurement managers should verify the credentials of suppliers by verifying their previous record of supplying materials on different websites. Managers should consider the ISO 9001 and ISO 14001 while evaluating the credentials of the suppliers. A third-party inspection from SGS or from other testing institutions should be done to ensure the consistency and properties of the material. Additionally, the proper Mill testing certificate (MTC) should be demanded by the suppliers to ensure the chemical composition and mechanical properties of materials.
Conclusion
DC53 steel is a high cold-work steel that offers high hardness, toughness, and wear resistance. Its improved toughness and ability to maintain the hardness and wear resistance make it superior compared to D2 steel. Its properties make it suitable for manufacturing molds, dies, precision parts, and machinery parts. For procurement managers, it is key to select the material according to the applications. Managers should contact those suppliers who ensure the quality of services. Feel free to get in touch with Jianglin.
FAQ
Is DC53 better than D2 steel?
Its improved toughness, maintained wear resistance, and hardness make it superior compared to D2 steel.
What hardness can DC53 reach?
It has a high hardness range of 60-62 HRC after the heat treatment processes.
What is DC53 steel mainly used for?
It is mainly used to manufacture molds, dies, automotive parts, electronic molds, cutting tools, and punches.
Does DC53 require special heat treatment?
Yes, DC53 also requires heat treatment processes such as preheating of material, hardening, and tempering.
