AISI Type H10 Chromium Hot Work Tool Steel Flange (UNS T20810)

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: AISI Type H10 Chromium Hot Work Tool Steel Flange (UNS T20810) Product Information -:- For detailed product information, please contact sales. -: AISI Type H10 Chromium Hot Work Tool Steel Flange (UNS T20810) Synonyms -:- For detailed product information, please contact sales. -:

AISI Type H10 Chromium Hot Work Tool Steel (UNS T20810) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type H10 Chromium Hot Work Tool Steel (UNS T20810)** ## **Overview** **AISI Type H10 (UNS T20810)** is a **medium-carbon, medium-chromium hot work tool steel** engineered to deliver **excellent toughness, good thermal fatigue resistance, and balanced high-temperature properties**. As part of the chromium-based H-series hot work steels, H10 offers a versatile combination of characteristics suitable for a wide range of hot forming applications, particularly where resistance to heat checking and thermal shock are critical. Its alloy balance provides reliable performance at moderate operating temperatures with superior machinability compared to higher-alloy hot work grades, making it a cost-effective choice for many aluminum and zinc die casting, extrusion, and forging applications. --- ## **Chemical Composition (Typical Weight %)** H10 features a balanced chromium-based composition optimized for toughness and thermal fatigue resistance. | Element | Content (%) | Role in Hot Work Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.35 - 0.45 | Provides base hardness and strength; balanced to maintain toughness at elevated temperatures. | | **Chromium (Cr)** | **3.00 - 3.75** | Primary alloying element; provides oxidation resistance, moderate hardenability, and contributes to hot strength through carbide formation. | | **Molybdenum (Mo)** | **2.50 - 3.00** | **Key element in H10.** Enhances high-temperature strength, creep resistance, hardenability, and promotes fine grain structure. Higher molybdenum content than H11/H13. | | **Vanadium (V)** | 0.25 - 0.50 | Forms stable vanadium carbides that refine grain size and improve wear resistance at elevated temperatures. | | **Silicon (Si)** | 0.80 - 1.20 | Increases resistance to thermal fatigue (heat checking) and oxidation; strengthens ferrite matrix. | | **Manganese (Mn)** | 0.25 - 0.70 | Aids hardenability and deoxidization. | | **Sulfur (S)** | ≤ 0.03 | - | | **Phosphorus (P)** | ≤ 0.03 | - | | **Iron (Fe)** | **Balance** | Base metal. | **Key Distinction:** H10's **elevated molybdenum content (2.50-3.00%)** relative to its chromium level distinguishes it from other chromium hot work steels. This provides enhanced high-temperature strength and hardenability while maintaining good toughness. --- ## **Physical & Mechanical Properties** *Properties are for material in the hardened and tempered condition (typical operating hardness).* | Property | Typical Value / Description | | :--- | :--- | | **Density** | 7.80 g/cm³ (0.282 lb/in³) | | **Hardness (Annealed)** | 200 - 230 HB | | **Hardness (Hardened & Tempered)** | **40 - 52 HRC** (Typically operated at 44-48 HRC for optimal toughness/strength balance) | | **Hot Hardness (at 540°C / 1000°F)** | **~35-38 HRC** (Good retention of hardness at elevated temperature) | | **Thermal Fatigue Resistance** | **Excellent.** High resistance to initiation and propagation of heat-check cracks due to good toughness and moderate thermal conductivity. | | **Toughness** | **Very Good to Excellent.** Among the toughest hot work steels, superior to higher-carbon and higher-alloy grades like H13 at equivalent hardness. | | **Thermal Conductivity** | **~28.5 W/m·K at 20°C** (Improves at higher temperatures) | | **Coefficient of Thermal Expansion** | ~12.3 × 10⁻⁶/°C (20-500°C) | | **Machinability (Annealed)** | **Good** (~65% of 1% carbon steel). Better than most hot work steels due to moderate alloy content. | | **Grindability** | **Good.** Grinds relatively easily compared to high-vanadium steels. | | **Maximum Continuous Service Temperature** | **~540°C (1000°F)** | --- ## **Heat Treatment Guidelines** Proper heat treatment is essential to develop H10's optimal hot work properties. | Process | Parameters | Purpose/Notes | | :--- | :--- | :--- | | **Annealing** | Heat to 845-870°C (1550-1600°F), slow furnace cool to 480°C (900°F) at ≤15°C/hr, then air cool. | Achieves ~215 HB for safe machining. | | **Stress Relieving** | 650-675°C (1200-1250°F) for 2 hrs, air cool. (After rough machining) | Reduces machining stresses. | | **Preheating** | **Preheat at 650-760°C (1200-1400°F).** | Minimizes thermal shock. | | **Austenitizing** | **995-1025°C (1825-1875°F).** Soak: 20-30 min/inch. (Use protective atmosphere) | Dissolves carbides for optimal alloying effect. | | **Quenching** | **Air quench** (preferred) or oil quench for maximum hardness in thick sections. | Air quenching minimizes distortion and stress. | | **Tempering** | **Double temper immediately.** **540-600°C (1000-1110°F)** for 2+ hrs each. | **Mandatory** to achieve secondary hardening and transform retained austenite. Temper above intended service temperature. | --- ## **Product Applications** H10 is versatile for various hot work applications requiring good toughness and thermal fatigue resistance. ### **Primary Hot Work Applications:** 1. **Aluminum & Zinc Die Casting:** Core pins, ejector pins, cavity inserts, and goosenecks where thermal fatigue resistance is critical. 2. **Hot Extrusion Dies & Tooling:** For aluminum, copper, and brass extrusion—particularly mandrels, liners, and die holders. 3. **Hot Forging Dies & Inserts:** For forging of non-ferrous metals and lower-temperature steel forging. 4. **Hot Stamping & Trimming Tools.** 5. **Plastic Injection Molds:** For high-temperature engineering plastics and abrasive filled materials. 6. **Glass Forming Tools:** Molds and plungers for glass manufacturing. 7. **Hot Work Punches & Shear Blades.** ### **Industry Usage:** - **Non-Ferrous Die Casting** - **Metal Extrusion** - **Hot Forging** - **Plastics Processing** - **Glass Manufacturing** --- ## **International Standards & Cross-Reference** UNS T20810 (H10) has specific equivalents in major international standards. | Standard | Designation | Equivalent / Similar Grade | | :--- | :--- | :--- | | **UNS (USA)** | **T20810** | - | | **AISI (USA)** | **H10** | - | | **ASTM (USA)** | A681 | Grade H10 | | **Europe (EN)** | **~1.2365** | 55NiCrMoV7 (Note: Contains Ni, different composition) | | **Germany (DIN)** | **1.2365** | 55NiCrMoV7 | | **Japan (JIS)** | **SKD7** | - | | **ISO** | **35CrMoV5** | - | **Note:** The European DIN 1.2365 (55NiCrMoV7) is chemically different from H10 as it contains nickel (~1.5%) and has lower molybdenum. True chemical equivalents are rare; H10 is primarily an AISI standard grade. --- ## **Advantages & Considerations** ### **Advantages:** 1. **Excellent Toughness:** Superior impact resistance compared to higher-alloy hot work steels, reducing risk of catastrophic failure. 2. **Good Thermal Fatigue Resistance:** Resists heat checking in cyclic thermal applications. 3. **Good Machinability & Grindability:** Easier to fabricate than most hot work steels, reducing tooling costs. 4. **Good Combination of Properties:** Balanced high-temperature strength, toughness, and thermal fatigue resistance. 5. **Cost-Effective:** Typically less expensive than higher-alloy grades like H13 or H21. ### **Considerations:** 1. **Lower Hot Hardness than Premium Grades:** Not suitable for applications above ~540°C (1000°F) continuous service. 2. **Lower Wear Resistance:** Less suitable for abrasive applications compared to higher-carbon or higher-vanadium grades. 3. **Limited Maximum Hardness:** Cannot achieve the high hardness levels of some other hot work steels. 4. **Less Common than H11/H13:** May have lower availability in some markets. --- ## **Comparison with Common Hot Work Grades** | Property | **H10 (UNS T20810)** | **H13 (UNS T20813)** | **H11 (UNS T20811)** | | :--- | :--- | :--- | :--- | | **Molybdenum Content** | **2.50-3.00%** | 1.25-1.75% | 1.25-1.75% | | **Chromium Content** | 3.00-3.75% | **4.75-5.50%** | **4.75-5.50%** | | **Vanadium Content** | 0.25-0.50% | **0.80-1.20%** | 0.30-0.60% | | **Primary Strength** | **Toughness & Thermal Fatigue** | **Balanced Performance** | **Maximum Toughness** | | **Typical Hardness Range** | 40-52 HRC | 42-52 HRC | 40-52 HRC | | **Best For** | **Thermal fatigue applications** | **General-purpose hot work** | **High-impact applications** | --- ## **Special Applications & Notes** ### **Die Casting Applications:** H10 is particularly valued in aluminum die casting for: - **Ejector pins** where toughness prevents breakage - **Core pins** in complex, thin sections - **Components subject to thermal shock** from water cooling ### **Extrusion Applications:** - **Mandrels and liners** for aluminum extrusion - **Die holders** and support tools - Particularly suitable for **hollow profiles** where toughness is critical ### **Heat Treatment Specifics:** For optimal thermal fatigue resistance in die casting: 1. Harden to 44-46 HRC 2. Double temper at 580-600°C (1075-1110°F) 3. Stress relieve after EDM or welding at 550°C (1020°F) --- ## **Conclusion** **AISI Type H10 Chromium Hot Work Tool Steel (UNS T20810)** is a **versatile, well-balanced material** that excels in applications where **thermal fatigue resistance and toughness are more critical than extreme hot hardness**. Its elevated molybdenum content provides enhanced high-temperature strength while maintaining the excellent toughness characteristic of medium-chromium hot work steels. While not as widely used as H13 for general hot work applications, H10 offers **superior performance in specific applications** involving severe thermal cycling, such as certain die casting components and extrusion tooling. For tooling engineers seeking a **cost-effective, reliable material** with excellent resistance to heat checking and good machinability for moderate-temperature hot work applications, H10 represents a proven and capable choice that continues to fill important niches in metal forming and casting industries. -:- For detailed product information, please contact sales. -: AISI Type H10 Chromium Hot Work Tool Steel (UNS T20810) Specification Dimensions Size： Diameter 20-1000 mm Length <6685 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 H10 Chromium Hot Work Tool Steel (UNS T20810) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type H10 Chromium Hot Work Tool Steel Flange (UNS T20810) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type H10 Chromium Hot Work Tool Steel Flange (UNS T20810) -:- For detailed product information, please contact sales. -:

Packing of AISI Type H10 Chromium Hot Work Tool Steel Flange (UNS T20810) -:- 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 Flange 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 3156 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