AISI Type H20 Hot Work Tool Steel Tube,Pipe

AISI Type H20 Hot Work Tool Steel Tube Product Information -:- For detailed product information, please contact sales. -: AISI Type H20 Hot Work Tool Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

AISI Type H20 Hot Work Tool Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type H20 Hot Work Tool Steel** ## **Overview** **AISI Type H20** is a **high-tungsten, chromium-based hot work tool steel** that represents a specialized grade within the tungsten series of hot work steels. Characterized by its **significant tungsten content and balanced chromium composition**, H20 is engineered to provide **superior hot hardness and excellent resistance to thermal softening** at elevated temperatures. As part of the transitional series between chromium-molybdenum and high-tungsten hot work steels, H20 offers enhanced high-temperature performance for applications where conventional chromium grades like H13 would soften excessively, while maintaining better toughness than extreme tungsten grades. --- ## **Chemical Composition (Typical Weight %)** H20 features a distinctive tungsten-chromium composition optimized for high-temperature service. | Element | Content (%) | Role in Hot Work Performance | | :--- | :--- | :--- | | **Tungsten (W)** | **8.00 - 10.00** | **Primary high-temperature strengthening element.** Forms stable tungsten carbides (WC, W₂C) that provide exceptional red hardness and resist softening at elevated temperatures. | | **Chromium (Cr)** | 2.00 - 3.00 | Provides oxidation resistance and contributes to hot strength; lower than in chromium-molybdenum hot work steels. | | **Vanadium (V)** | 0.40 - 0.60 | Forms vanadium carbides that refine grain size and improve elevated-temperature properties. | | **Carbon (C)** | 0.32 - 0.42 | Provides base hardness while maintaining toughness at high temperatures. | | **Molybdenum (Mo)** | **≤ 0.25** | Minimal content; H20 relies on tungsten rather than molybdenum for high-temperature properties. | | **Silicon (Si)** | 0.80 - 1.20 | Increases resistance to thermal fatigue and oxidation. | | **Manganese (Mn)** | 0.20 - 0.50 | Aids hardenability and deoxidization. | | **Sulfur (S)** | ≤ 0.03 | - | | **Phosphorus (P)** | ≤ 0.03 | - | | **Iron (Fe)** | **Balance** | Base metal. | **Key Distinction:** H20's **high tungsten content (8-10%) with relatively low chromium (2-3%)** places it firmly in the tungsten-based hot work steel category, differentiating it from the chromium-molybdenum H11-H13 series and aligning it more closely with the H21-H26 tungsten series. --- ## **Physical & Mechanical Properties** *Properties are for material in the hardened and tempered condition.* | Property | Typical Value / Description | | :--- | :--- | | **Density** | ~8.20 g/cm³ (Higher than molybdenum-based grades due to tungsten) | | **Hardness (Annealed)** | 215 - 240 HB | | **Hardness (Hardened & Tempered)** | **44 - 54 HRC** (Typically operated at 48-52 HRC for hot work) | | **Hot Hardness (at 600°C / 1110°F)** | **~40-44 HRC** (Superior to H13 at this temperature) | | **Tensile Strength** | 1500 - 1800 MPa (at 50 HRC) | | **Yield Strength (0.2%)** | 1300 - 1600 MPa (at 50 HRC) | | **Elongation** | 5 - 10% (at 50 HRC) | | **Impact Toughness (Charpy)** | 10 - 20 J (at 50 HRC) | | **Thermal Fatigue Resistance** | **Fair to Good.** Adequate for many applications but generally inferior to H13 in severe thermal cycling. | | **Thermal Conductivity** | **~25.0 W/m·K** at 20°C (Lower than molybdenum-based grades) | | **Coefficient of Thermal Expansion** | ~11.8 × 10⁻⁶/°C (20-500°C) | | **Maximum Continuous Service Temperature** | **~650°C (1200°F)** | | **Machinability (Annealed)** | **Fair** (~45% of 1% carbon steel). More difficult than H13 due to tungsten carbides. | | **Grindability** | **Fair to Poor.** Tungsten carbides increase grinding difficulty. | --- ## **Heat Treatment Guidelines** Proper heat treatment is essential to optimize H20's tungsten-strengthened microstructure. | Process | Parameters | Special Considerations for H20 | | :--- | :--- | :--- | | **Annealing** | Heat to 870-900°C (1600-1650°F), slow furnace cool to 480°C (900°F) at ≤15°C/hr, then air cool. | Results in ~230 HB for machining. | | **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). | Critical to prevent thermal shock. | | **Austenitizing** | **1100-1150°C (2010-2100°F).** Soak: 20-30 min/inch. | **High temperature required** to dissolve tungsten carbides; use protective atmosphere. | | **Quenching** | **Oil quench** (preferred) or air quench. | Oil quenching ensures full hardness; air quenching suitable for complex shapes. | | **Tempering** | **Double temper at 600-650°C (1110-1200°F)** for 2+ hours each. | **High tempering temperatures required** to develop optimal properties. | --- ## **Product Applications** H20 is specialized for high-temperature applications where enhanced hot hardness is required. ### **Primary Hot Work Applications:** 1. **Hot Forging Dies:** For forging of alloy steels, stainless steels, and high-temperature alloys. 2. **Hot Extrusion Tooling:** For extrusion of copper, brass, and higher-temperature non-ferrous alloys. 3. **Die Casting Dies for High Melting Point Alloys:** Such as brass, bronze, and copper-based alloys. 4. **Hot Work Tools for Steel Forming:** At high temperatures (600-700°C) where enhanced hot hardness is critical. 5. **Hot Piercing Punches and Mandrels:** For piercing high-temperature metals. 6. **Tools for Isothermal Forging:** Where dies are maintained at high temperatures during prolonged operations. 7. **Glass Forming Tools:** Molds and plungers for glass manufacturing. ### **Industry Usage:** - **High-Temperature Alloy Forging** - **Copper & Brass Extrusion** - **Specialty Die Casting** - **Glass Manufacturing** - **Heavy Equipment Manufacturing** --- ## **International Standards & Cross-Reference** AISI H20 is a specialized grade with specific international equivalents. | Standard | Designation | Equivalent / Similar Grade | | :--- | :--- | :--- | | **AISI/SAE (USA)** | **H20** | - | | **UNS (USA)** | **T20820** | - | | **ASTM (USA)** | A681 | Grade H20 | | **Europe (EN)** | **~1.2601** | X30WCrV9-3 (Approximate) | | **Germany (DIN)** | **~1.2601** | X30WCrV9-3 | | **Japan (JIS)** | **SKD4** | - | | **ISO** | **~30WCrV9** | - | | **UK (BS)** | **BH20** | - | **Important Note:** True chemical equivalents to AISI H20 vary among international standards. The European DIN 1.2601 represents a similar tungsten-chromium hot work steel concept. H20 is primarily an AISI standard grade. --- ## **Technical Comparison: H20 vs. Other Hot Work Steels** | Property | **H20 (Tungsten Series)** | **H13 (Chromium-Molybdenum)** | **H21 (High-Tungsten)** | | :--- | :--- | :--- | :--- | | **Tungsten Content** | **8.00-10.00%** | 0% | **8.00-10.00%** | | **Chromium Content** | 2.00-3.00% | **4.75-5.50%** | 3.00-3.75% | | **Hot Hardness (at 600°C)** | **40-44 HRC** | 34-36 HRC | **42-46 HRC** | | **Toughness (at 48 HRC)** | 10-20 J | **25-40 J** | 10-20 J | | **Oxidation Resistance** | Fair | **Excellent** | Fair | | **Maximum Service Temperature** | **~650°C (1200°F)** | ~540°C (1000°F) | **~650°C (1200°F)** | | **Primary Application** | **High-temp forging** | **Die casting** | **High-temp forging** | --- ## **Advantages & Considerations** ### **Advantages:** 1. **Excellent Hot Hardness:** Superior resistance to softening at high temperatures (up to 650°C). 2. **Good High-Temperature Strength:** Maintains mechanical properties at elevated temperatures. 3. **Resistance to Thermal Softening:** Tungsten carbides provide excellent resistance to tempering effects. 4. **Good Wear Resistance at Temperature:** Suitable for applications involving both heat and abrasion. ### **Considerations:** 1. **Lower Toughness:** Reduced impact resistance compared to chromium-molybdenum grades. 2. **Reduced Thermal Fatigue Resistance:** More susceptible to heat checking than H13. 3. **Lower Oxidation Resistance:** Lower chromium content reduces oxidation resistance compared to H13. 4. **Complex Heat Treatment:** Requires precise control of high-temperature processing. 5. **Limited Availability:** Less common than mainstream hot work grades. --- ## **Conclusion** **AISI Type H20 Hot Work Tool Steel** represents a **specialized tungsten-based hot work steel** offering **enhanced high-temperature performance** for applications beyond the capabilities of conventional chromium-molybdenum grades. While its **specialized nature and specific property profile** limit its use compared to mainstream grades like H13, H20 provides a **valuable solution for high-temperature applications** where resistance to thermal softening is paramount. -:- For detailed product information, please contact sales. -: AISI Type H20 Hot Work Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6693 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 H20 Hot Work Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type H20 Hot Work Tool Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type H20 Hot Work Tool Steel Tube -:- For detailed product information, please contact sales. -:

Packing of AISI Type H20 Hot Work Tool 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 3164 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