AISI Type H12 Hot Work Tool Steel

AISI Type H12 Hot Work Tool Steel Product Information -:- For detailed product information, please contact sales. -: AISI Type H12 Hot Work Tool Steel Synonyms -:- For detailed product information, please contact sales. -:

AISI Type H12 Hot Work Tool Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type H14 Chromium Hot Work Tool Steel (UNS T20814)** ## **Overview** **AISI Type H14 (UNS T20814)** is a **high-tungsten, medium-chromium hot work tool steel** that represents a specialized member of the hot work steel family. Characterized by its **significant tungsten content combined with chromium alloying**, H14 is engineered to provide **superior hot hardness and excellent resistance to softening at elevated temperatures**. Unlike the more common chromium-molybdenum-vanadium H-series steels, H14 utilizes tungsten as its primary high-temperature strengthening element, making it particularly suitable for applications involving sustained high-temperature exposure and moderate mechanical stress. --- ## **Chemical Composition (Typical Weight %)** H14 features a distinctive tungsten-chromium composition with balanced carbon content. | Element | Content (%) | Role in Hot Work Performance | | :--- | :--- | :--- | | **Tungsten (W)** | **4.00 - 5.00** | **Primary high-temperature strengthening element.** Forms stable tungsten carbides (WC, W₂C) that provide exceptional red hardness and resistance to tempering at elevated temperatures. | | **Chromium (Cr)** | 4.00 - 4.75 | Provides oxidation resistance, moderate hardenability, and contributes to hot strength through chromium carbide formation. | | **Vanadium (V)** | 0.40 - 0.60 | Forms stable vanadium carbides that refine grain size and improve elevated-temperature wear resistance. | | **Carbon (C)** | 0.35 - 0.45 | Balanced to provide adequate hardness while maintaining toughness at high temperatures. | | **Silicon (Si)** | 0.80 - 1.20 | Increases resistance to thermal fatigue and oxidation. | | **Manganese (Mn)** | 0.20 - 0.50 | Aids hardenability and deoxidization. | | **Molybdenum (Mo)** | **≤ 0.25** | Minimal content; H14 relies on tungsten rather than molybdenum for high-temperature strength. | | **Sulfur (S)** | ≤ 0.03 | - | | **Phosphorus (P)** | ≤ 0.03 | - | | **Iron (Fe)** | **Balance** | Base metal. | **Key Distinction:** H14's **tungsten content (4-5%)** distinguishes it from other chromium-based hot work steels like H11, H12, and H13, which rely primarily on molybdenum and chromium. This makes H14 part of a transitional series between pure chromium hot work steels and tungsten-based hot work steels (H21-H26). --- ## **Physical & Mechanical Properties** *Properties are for material in the hardened and tempered condition.* | Property | Typical Value / Description | | :--- | :--- | | **Density** | ~7.85 g/cm³ (Slightly higher than molybdenum-based H-series due to tungsten) | | **Hardness (Annealed)** | 200 - 225 HB | | **Hardness (Hardened & Tempered)** | **40 - 52 HRC** (Typically operated at 44-48 HRC) | | **Hot Hardness (at 600°C / 1110°F)** | **~36-40 HRC** (Excellent retention of hardness at high temperature due to tungsten carbides) | | **Thermal Fatigue Resistance** | **Good.** Resists heat checking but may be slightly inferior to H13 in severe thermal cycling due to different carbide structure. | | **Toughness** | **Fair to Good.** Lower than H11/H13 at equivalent hardness due to tungsten carbides, but adequate for many hot work applications. | | **Thermal Conductivity** | **~26 W/m·K** at 20°C (Lower than molybdenum-based grades) | | **Coefficient of Thermal Expansion** | ~12.1 × 10⁻⁶/°C (20-500°C) | | **Maximum Continuous Service Temperature** | **~600°C (1110°F)** (Higher than H13's ~540°C) | | **Machinability (Annealed)** | **Fair** (~55% of 1% carbon steel). More difficult than H13 due to tungsten carbides. | | **Grindability** | **Fair to Poor.** Tungsten carbides increase grinding difficulty. | --- ## **Heat Treatment Guidelines** H14 requires careful heat treatment to optimize its tungsten-strengthened microstructure. | Process | Parameters | Special Considerations for H14 | | :--- | :--- | :--- | | **Annealing** | Heat to 845-870°C (1550-1600°F), slow furnace cool to 480°C (900°F) at ≤15°C/hr, then air cool. | Standard annealing practice; results in ~210 HB. | | **Stress Relieving** | 650-675°C (1200-1250°F) for 2 hrs, air cool. | Recommended after rough machining. | | **Preheating** | **Double preheat:** 650°C (1200°F) and 850°C (1560°F). | Essential to prevent thermal shock. | | **Austenitizing** | **1000-1040°C (1830-1905°F).** Soak: 20-30 min/inch. | Higher temperatures improve solution of tungsten carbides but may reduce toughness. | | **Quenching** | **Oil quench** (preferred) or air quench. | Oil quenching ensures full hardness in thicker sections; air quench for complex shapes. | | **Tempering** | **Double temper at 560-620°C (1040-1150°F)** for 2+ hrs each. | Higher tempering temperatures than H13 to develop optimal properties; temper above intended service temperature. | --- ## **Product Applications** H14 is specialized for applications requiring good hot hardness at temperatures between 500-650°C. ### **Primary Hot Work Applications:** 1. **Brass and Copper Forging Dies:** Where higher operating temperatures than aluminum forging are encountered. 2. **Hot Extrusion Tooling:** For copper and brass extrusion where temperatures exceed those suitable for H13. 3. **Die Casting Dies for Higher Melting Point Alloys:** Such as brass or bronze die casting. 4. **Hot Work Tools for Steel Forming:** At moderate temperatures where higher hot hardness than H13 is beneficial. 5. **Hot Piercing Punches and Mandrels:** For piercing hot metals. 6. **Glass Forming Tools:** Where sustained high-temperature exposure occurs. 7. **Hot Shear Blades:** For cutting hot metals at elevated temperatures. ### **Industry Usage:** - **Non-Ferrous Metal Forging (Brass, Copper)** - **Copper & Brass Extrusion** - **High-Temperature Die Casting** - **Glass Manufacturing** - **Specialty Hot Forming Operations** --- ## **International Standards & Cross-Reference** AISI H14 is recognized in several international systems, though less common than H13. | Standard | Designation | Equivalent / Similar Grade | | :--- | :--- | :--- | | **AISI/SAE (USA)** | **H14** | - | | **UNS (USA)** | **T20814** | - | | **ASTM (USA)** | A681 | Grade H14 | | **Europe (EN)** | **~1.2606** | X30WCrV5-3 (Approximate; different composition) | | **Germany (DIN)** | **~1.2606** | X30WCrV5-3 | | **Japan (JIS)** | **Not standard** | - | | **ISO** | **~30WCrV5** | - | **Note:** True chemical equivalents to AISI H14 are rare in modern international standards. The European 1.2606 has different tungsten and chromium levels but represents a similar tungsten-chromium hot work steel concept. H14 is primarily an AISI standard grade. --- ## **Technical Comparison: H14 vs. Other Hot Work Steels** | Property | **H14 (UNS T20814)** | **H13 (UNS T20813)** | **H21 (UNS T20821)** | | :--- | :--- | :--- | :--- | | **Primary Alloy** | **Tungsten (4-5% W)** | Molybdenum (1.25-1.75% Mo) | **High Tungsten (8-10% W)** | | **Chromium Content** | 4.00-4.75% | **4.75-5.50%** | 3.00-3.75% | | **Hot Hardness** | **Excellent (to 600°C)** | Very Good (to 540°C) | **Superior (to 650°C)** | | **Toughness** | Fair to Good | **Very Good** | Fair | | **Thermal Fatigue** | Good | **Excellent** | Fair | | **Primary Application** | **Moderate-high temp tools** | **General-purpose die casting** | **High-temperature forging** | | **Quenching** | Oil or Air | Primarily Air | Oil or Air | --- ## **Advantages & Considerations** ### **Advantages:** 1. **Good Hot Hardness:** Maintains hardness at higher temperatures than molybdenum-based chromium hot work steels. 2. **Resistance to Tempering:** Tungsten carbides resist coarsening and dissolution at high temperatures. 3. **Good Wear Resistance at Temperature:** Suitable for applications involving both heat and abrasion. 4. **Moderate Cost:** Less expensive than high-tungsten steels (H21-H26) while offering better hot hardness than H13. 5. **Versatile Quenching:** Can be oil or air quenched depending on application requirements. ### **Considerations:** 1. **Lower Toughness:** Less impact resistant than H11 or H13 at equivalent hardness. 2. **Poorer Thermal Fatigue Resistance:** May be more susceptible to heat checking than H13 in severe thermal cycling. 3. **Lower Thermal Conductivity:** Reduced heat dissipation compared to molybdenum-based grades. 4. **Limited Availability:** Much less common than H13; may require special ordering. 5. **Specific Application Focus:** Over-specified for typical aluminum die casting; best for moderate-high temperature applications. --- ## **Special Metallurgical Characteristics** ### **Tungsten Carbide Effects:** 1. **Slower Diffusion Rates:** Tungsten carbides dissolve and reprecipitate more slowly than molybdenum carbides, affecting heat treatment kinetics. 2. **Higher Austenitizing Temperatures:** Required to achieve adequate tungsten in solution. 3. **Different Tempering Response:** Peak secondary hardness occurs at higher tempering temperatures than for molybdenum-based steels. ### **Microstructural Stability:** H14's tungsten-based carbides provide excellent microstructural stability during prolonged exposure to temperatures in the 500-600°C range, making it suitable for tools with long cycle times or continuous operation at elevated temperatures. --- ## **Modern Relevance & Applications** While largely supplanted by more advanced hot work steels for mainstream applications, H14 continues to find use in: - **Legacy tooling systems** where original specifications call for H14 - **Specialized high-temperature applications** where its specific balance of properties is advantageous - **Cost-sensitive applications** requiring better hot hardness than H13 but where premium H21-series steels are too expensive - **Educational and research contexts** as an example of tungsten-modified chromium hot work steel --- ## **Conclusion** **AISI Type H14 Chromium Hot Work Tool Steel (UNS T20814)** represents a **specialized, transitional material** that bridges the gap between conventional chromium-molybdenum hot work steels and high-tungsten hot work grades. Its **unique tungsten-chromium alloy system** provides **enhanced hot hardness and temperature capability** compared to H13, making it suitable for applications involving sustained exposure to temperatures in the 500-600°C range. While its **reduced toughness and thermal fatigue resistance** compared to H13 limit its use in severe thermal cycling applications, H14 offers a **cost-effective solution for moderate-high temperature hot work** where resistance to softening is the primary concern. For tooling engineers working with brass, copper, or higher-temperature forming operations where H13 shows limitations but full tungsten hot work steels are excessive, H14 provides a valuable, if specialized, material option that continues to serve niche applications in metal forming and processing industries. -:- For detailed product information, please contact sales. -: AISI Type H12 Hot Work Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6687 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. -: AISI Type H12 Hot Work Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type H12 Hot Work Tool Steel -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type H12 Hot Work Tool Steel -:- For detailed product information, please contact sales. -:

Packing of AISI Type H12 Hot Work Tool Steel -:- 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 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 3158 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