Assab Steel Flanges,QRO 90 SUPREME Hot Work Steel Flange

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. -: Assab Steel Flanges QRO 90 SUPREME Hot Work Steel Flange Product Information -:- For detailed product information, please contact sales. -: Assab Steel Flanges QRO 90 SUPREME Hot Work Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

Assab Steels QRO 90 SUPREME Hot Work Steel Product Information -:- For detailed product information, please contact sales. -: ### **Assab Steels QRO 90 SUPREME: Premium High-Performance Hot Work Tool Steel for Extended Die Life** --- #### **1. Introduction** **Assab Steels QRO 90 SUPREME** is a high-performance, **premium martensitic chromium-molybdenum-vanadium (Cr-Mo-V) hot work tool steel** manufactured using the **Electro-Slag Remelting (ESR)** process. Unlike standard H13-type steels, QRO 90 is a **proprietary alloy** specifically engineered to deliver superior performance in the most demanding aluminum die-casting and other hot work applications. Its optimized chemistry and ESR structure are designed to provide outstanding **thermal fatigue resistance** (heat checking resistance), **excellent thermal conductivity**, and **high toughness at elevated temperatures**, resulting in significantly extended die life and reduced downtime. **Key Value Propositions:** * **Superior Thermal Fatigue Resistance:** Outstanding resistance to the formation and growth of heat-checking cracks, a primary failure mode in aluminum die casting. This is achieved through a balanced microstructure and high thermal conductivity. * **High Thermal Conductivity:** About 10-15% higher than standard H13, promoting faster heat dissipation from the die surface, reducing thermal gradients and stress. * **Excellent Toughness at Service Temperatures:** Maintains good ductility and impact resistance even at high operating temperatures, reducing the risk of catastrophic cracking. * **Enhanced High-Temperature Strength:** Superior resistance to heat softening (hot hardness) compared to standard H13. * **Excellent Isotropic Properties (ESR):** Uniform performance in all directions due to a clean, homogeneous microstructure, ensuring predictable behavior in complex dies. --- #### **2. International Standard Designations** * **Assab / Uddeholm:** QRO 90 SUPREME (ESR) * **AISI / ASTM A681:** H13 **Modified / Proprietary Grade** (It is a distinct alloy, not a direct H13 equivalent) * **European Norm (EN):** Proprietary (Closest matrix is a modified 1.2344) * **DIN:** Proprietary alloy (X35CrMoV5-1 modified) * **Common Industry Reference:** Premium High-Conductivity Die-Casting Steel * **Competitor Equivalents:** Similar proprietary high-performance grades include **Böhler W300 ISOBLOC** and **ThyssenKrupp TQ1**. --- #### **3. Chemical Composition (Typical Weight %)** | Element | Carbon (C) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | | :--- | :---: | :---: | :---: | :---: | :---: | | **%** | 0.38 | 0.30 | 2.60 | 2.30 | 0.55 | *Key Difference vs. H13: **Lower Chromium (Cr) and Silicon (Si)**, **Higher Molybdenum (Mo)**. This unique composition is the foundation of its higher thermal conductivity and thermal shock resistance.* --- #### **4. Physical & Mechanical Properties** * **Density:** 7.80 g/cm³ * **Thermal Conductivity:** **~32.0 W/m·K** (at 20°C) – *Higher than H13 (~28 W/m·K)*. * **Coefficient of Thermal Expansion:** 12.5 x 10⁻⁶/K (20-200°C) * **Specific Heat Capacity:** ~460 J/kg·K * **Elastic Modulus:** ~205 GPa * **Typical Operational Hardness:** **44-48 HRC** (Commonly used at 44-46 HRC for optimal toughness/thermal fatigue balance in aluminum die casting). * **Hot Hardness:** Superior retention of hardness at temperatures above 500°C compared to standard H13. --- #### **5. Heat Treatment** * **Soft Annealed Hardness:** ~ 185 HB * **Stress Relieving (after rough machining):** 600-650°C * **Preheating:** Two-stage preheating at 650°C and 850°C is crucial. * **Austenitizing Temperature:** **1010-1030°C** (Lower than H13, important for optimal properties). * **Quenching:** High-pressure gas quenching (preferred) or oil. * **Tempering:** **Double tempering is mandatory.** Temper in the range of **540-620°C**. For aluminum die casting, tempering at 580-600°C to achieve 44-46 HRC is typical. The hardness curve is flatter than H13, offering more flexibility. --- #### **6. Product Applications** QRO 90 SUPREME is engineered for applications where thermal fatigue and heat checking are the primary limits on tool life. 1. **High-Pressure Aluminum Die Casting (Primary Application):** * Core and cavity inserts for large, complex components (e.g., engine blocks, transmission housings, structural parts). * Units with high thermal load and severe cooling conditions. * "High-heat-checking-risk" areas like sharp corners and thin ribs. 2. **Copper and Brass Die Casting / Hot Forging:** * Dies and inserts where service temperatures are extremely high. 3. **Hot Work Tools Requiring Fast Heat Removal:** * Tools for which internal water cooling is critical to performance. 4. **Plastic Molds for High-Temperature Polymers:** * Molds for engineering plastics processed at very high temperatures (e.g., PEEK, PPS). --- #### **7. Quality & Supply Forms** * **Quality:** Electro-Slag Remelted (ESR) for utmost cleanliness and homogeneity. Subject to strict ultrasonic inspection. * **Available Forms:** * ESR blocks and billets. * Precision ground flat stock. * Black or peeled round and flat bars. * Custom pre-machined tool components. --- #### **8. Comparison: QRO 90 SUPREME vs. Standard H13 (e.g., 8407)** | **Property** | **QRO 90 SUPREME** | **Standard H13 (8407)** | | :--- | :--- | :--- | | **Thermal Conductivity** | **Higher (~32 W/m·K)** | Standard (~28 W/m·K) | | **Thermal Fatigue Resistance** | **Superior** (Best-in-class) | Very Good | | **Hot Hardness** | **Better retention at high temp** | Good | | **Optimal Hardness Range** | Slightly lower (44-48 HRC) | Slightly higher (46-52 HRC) | | **Typical Tempering Temperature** | Slightly higher (for same hardness) | Standard | | **Alloy Design** | Proprietary (Lower Cr/Si, Higher Mo) | Standard (5% Cr) | | **Primary Advantage** | **Extended die life in thermal fatigue applications** | Excellent all-around balance | --- #### **9. Conclusion** **Assab Steels QRO 90 SUPREME** is a purpose-built, premium solution for the most challenging hot work environments, particularly aluminum die casting. Its patented alloy design, focused on maximizing thermal conductivity and thermal fatigue resistance, directly addresses the core mechanisms that limit the life of standard H13 dies. For high-production, high-value die-casting operations where unplanned downtime and die repair costs are critical metrics, the investment in QRO 90 SUPREME translates into a demonstrable return on investment through dramatically increased shot counts, improved part quality consistency, and reduced maintenance. It is the definitive choice when pushing the performance limits of hot work tooling. -:- For detailed product information, please contact sales. -: Assab Steels QRO 90 SUPREME Hot Work Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7243 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. -: Assab Steels QRO 90 SUPREME Hot Work Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Assab Steel Flanges QRO 90 SUPREME Hot Work Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers Assab Steel Flanges QRO 90 SUPREME Hot Work Steel Flange -:- For detailed product information, please contact sales. -:

Packing of Assab Steel Flanges QRO 90 SUPREME Hot Work Steel Flange -:- 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 3714 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