International Mold Steel Tube,Pipe,DHA-World Die Cast & Forging Steel Tube,Pipe

International Mold Steel Tube DHA-World Die Cast & Forging Steel Tube Product Information -:- For detailed product information, please contact sales. -: International Mold Steel Tube DHA-World Die Cast & Forging Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

International Mold Steel DHA-World Die Cast & Forging Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: DHA-World Advanced Hot Work Die Steel for Die Casting and Forging** ## **1. Overview** **DHA-World** is a premium, **maraging-type hot work die steel** specifically engineered for extreme applications in aluminum, magnesium, and copper alloy die casting, as well as precision hot forging. Unlike conventional H13-type steels that rely on secondary hardening through carbide precipitation, DHA-World utilizes a **maraging (martensite aging) hardening mechanism** based on intermetallic compound precipitation, delivering a unique combination of **exceptional toughness, high thermal conductivity, and superior dimensional stability** during heat treatment. This advanced steel is designed for large, complex dies requiring maximum resistance to heat checking, thermal shock, and catastrophic failure in high-pressure die casting and severe hot forging applications. ## **2. International Standards & Specifications** DHA-World is a proprietary steel grade developed through specialized metallurgy, representing a distinct category within hot work die steels. * **Primary Manufacturer Standard:** * **International Mold Steel (IMS) DHA-World:** Proprietary specification for this maraging-type hot work die steel. * **Material Classification & Comparative Grades:** * **Type:** **Maraging-Type Hot Work Tool Steel** (Low-Carbon, High-Nickel-Cobalt-Molybdenum Alloy). * **Performance Benchmark:** A specialized alternative to conventional hot work steels like H13, offering superior toughness and thermal conductivity. It is conceptually similar to other maraging-type die steels such as **DIN 1.2709** (18% Ni maraging steel) but optimized specifically for hot work applications with adjusted alloy content. * **International Equivalents (Conceptual Similarity):** * **QRO 90 Supreme (Uddeholm):** A high-performance hot work steel also known for high toughness and conductivity, though based on different metallurgy. * **Dievar (Uddeholm):** Another premium hot work steel emphasizing thermal fatigue resistance. * **Proprietary Maraging Grades:** Such as **Viking's MMR-40** or other manufacturer-specific maraging formulations for tooling. * **Distinct Feature:** It does not have a direct AISI or standard DIN equivalent, occupying a niche performance category. ## **3. Chemical Composition (Weight %, Typical)** The composition is characterized by very low carbon, high nickel and cobalt, and strategic additions of molybdenum and titanium for maraging precipitation. | Element | Typical Range (%) | Role & Benefit | | :--- | :--- | :--- | | **Carbon (C)** | ≤ 0.03 (Very Low) | **Key differentiator.** Minimizes carbide formation, maximizing **toughness and thermal conductivity**. Eliminates coarse carbides that can act as crack initiators. | | **Nickel (Ni)** | 15.0 – 19.0 | **Primary alloy.** Stabilizes a soft, tough, low-carbon martensite matrix upon air cooling from solution treatment. Essential for the maraging mechanism. | | **Cobalt (Co)** | 8.0 – 12.0 | **Critical co-alloy.** Increases the martensite start (Ms) temperature, refines the martensitic structure, and promotes the formation of fine, intermetallic precipitates (e.g., Ni₃Mo, Ni₃Ti) during aging. | | **Molybdenum (Mo)** | 4.0 – 5.0 | Forms fine, coherent intermetallic precipitates (with Ni) during aging, providing **precipitation hardening** without compromising toughness significantly. | | **Titanium (Ti)** | 0.5 – 1.5 | Forms Ni₃Ti precipitates during aging, contributing to secondary hardening and strength. | | **Aluminum (Al)** | 0.05 – 0.15 | Acts as a deoxidizer and may contribute to precipitation hardening. | | **Other Elements:** Trace amounts of **Zirconium (Zr)** or **Boron (B)** may be present for grain boundary strengthening. | ## **4. Typical Physical & Mechanical Properties (Solution Treated & Aged)** * **Standard Heat Treatment Cycle:** * **Solution Treatment:** 820-850°C (1510-1560°F), followed by **air cooling**. Results in a soft, machinable, low-carbon martensite structure (~28-32 HRC). * **Aging (Precipitation Hardening):** 480-510°C (900-950°F) for several hours. This relatively low-temperature process hardens the steel with **minimal dimensional change and distortion**. * **Mechanical Properties (After Solution Treatment & Aging):** * **Hardness:** 46 – 52 HRC (achievable via aging; typical operating range ~48-50 HRC). * **Tensile Strength:** 1550 – 1850 MPa (225,000 – 268,000 psi) * **Yield Strength (0.2% Offset):** 1450 – 1750 MPa (210,000 – 254,000 psi) * **Elongation:** 8 – 12% * **Impact Toughness (Charpy V-Notch):** **40 – 70 J (29 – 52 ft-lb)** – **Exceptionally high for its hardness level**, a primary advantage. Can be 2-3 times higher than conventional H13 at similar hardness. * **Fracture Toughness (K1C):** Very high, providing outstanding resistance to crack propagation. * **Key Performance Metrics:** * **Thermal Conductivity:** **~ 30-35 W/m·K** – **Significantly higher (25-40%) than H13-type steels.** This allows heat to dissipate faster from the die surface, reducing thermal gradients and stresses, which is critical for thermal fatigue resistance. * **Thermal Fatigue Resistance:** **Excellent.** The combination of high toughness, high thermal conductivity, and a uniform microstructure without stress-concentrating carbides provides superior resistance to heat check initiation and growth. * **Thermal Shock Resistance:** Outstanding, due to high toughness and conductivity. * **Dimensional Stability During Heat Treatment:** **Minimal distortion.** The aging process at low temperature causes negligible size change compared to the quenching and high-temperature tempering of conventional steels. * **Physical Properties:** * **Density:** ~8.0 g/cm³ * **Coefficient of Thermal Expansion:** ~11.0 x 10⁻⁶/K (20-100°C) * **Modulus of Elasticity:** ~180-190 GPa (slightly lower than conventional tool steels) ## **5. Product Application** DHA-World is ideal for highly demanding applications where thermal fatigue and catastrophic cracking are primary failure modes. * **Large, Complex Aluminum & Magnesium Die Casting Dies:** * **Cavities and Cores** for automotive structural components (e.g., large thin-wall parts, shock towers, battery housings for EVs). * **Dies with intricate, deep ribs and thin walls** prone to heat checking. * **Unit Dies** for high-volume production where reliability is paramount. * **Copper Alloy (Brass, Bronze) Die Casting:** * **Dies and Inserts** where operating temperatures are extremely high. * **Precision Hot Forging (Steel, Titanium, Superalloys):** * **Forging Dies and Inserts** subject to severe thermal shock. * **Precision forging dies** requiring tight dimensional tolerances. * **Other Severe Hot Work Applications:** * **Glass Mold Tooling.** ## **6. Key Features & Advantages** * **Unmatched Toughness at Operating Hardness:** Provides the highest impact and fracture toughness among commercial hot work die steels, dramatically reducing the risk of sudden, catastrophic die failure. * **Superior Thermal Conductivity:** Rapid heat extraction from the die surface minimizes thermal gradients, lowers peak surface temperature, and reduces thermal stress, directly extending thermal fatigue life. * **Excellent Thermal Fatigue & Shock Resistance:** The synergy of high toughness and high conductivity makes it the benchmark material for resisting heat checking in severe cyclic heating applications. * **Minimal Distortion Heat Treatment:** The simple solution treat + age cycle offers great dimensional predictability and allows for near-net-shape machining before final hardening. * **Good Machinability & Weldability:** In the solution-treated state, it machines relatively easily. It can also be welded and re-aged with proper procedures. * **Uniform Microstructure:** Absence of large, hard carbides results in isotropic properties and smooth polishing characteristics. ## **7. Processing Guidelines** * **Machining:** Perform bulk machining in the soft, solution-treated condition (~30 HRC). Final machining can be done after aging due to minimal distortion. * **Heat Treatment:** The solution treatment and aging cycle is straightforward but requires precise temperature control. Aging temperature directly controls final hardness. * **Welding:** Repairs are feasible using matching or nickel-based superalloy filler metals, followed by a full re-aging cycle. * **Surface Treatment:** Responds well to **nitriding** and **PVD coatings** to further enhance surface hardness and resistance to soldering/erosion. **Summary:** International Mold Steel DHA-World represents a paradigm shift in hot work die steel technology, prioritizing ultimate toughness and thermal management over traditional carbide-based wear resistance. Its maraging-type metallurgy delivers a unique set of properties that make it the ideal choice for preventing the most costly failure modes in die casting and forging—catastrophic cracking and thermal fatigue. For applications where die reliability, extended service life, and the ability to produce complex, high-integrity castings/forgings are critical, DHA-World provides a superior and often cost-effective solution despite its higher initial material cost, by maximizing uptime and minimizing unscheduled die maintenance. -:- For detailed product information, please contact sales. -: International Mold Steel DHA-World Die Cast & Forging Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7039 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: International Mold Steel DHA-World Die Cast & Forging Steel Properties -:- For detailed product information, please contact sales. -:

Applications of International Mold Steel Tube DHA-World Die Cast & Forging Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers International Mold Steel Tube DHA-World Die Cast & Forging Steel Tube -:- For detailed product information, please contact sales. -:

Packing of International Mold Steel Tube DHA-World Die Cast & Forging Steel Tube -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3510 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition