AISI Type S6 Shock Resisting Tool Steel Flange (UNS T41906)

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 S6 Shock Resisting Tool Steel Flange (UNS T41906) Product Information -:- For detailed product information, please contact sales. -: AISI Type S6 Shock Resisting Tool Steel Flange (UNS T41906) Synonyms -:- For detailed product information, please contact sales. -:

AISI Type S6 Shock Resisting Tool Steel (UNS T41906) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type S6 Shock-Resisting Tool Steel (UNS T41906)** ## **Overview** **AISI S6 (UNS T41906)** is a **silicon-chromium-tungsten air-hardening shock-resisting tool steel**, distinguished by its **exceptionally high silicon content**. It is engineered to provide an **extraordinary combination of high hardness and extreme toughness**, making it uniquely capable of withstanding severe impact at higher hardness levels than other S-series grades. S6's air-hardening nature provides excellent dimensional stability during heat treatment, a significant advantage over water- or oil-hardening shock steels for complex tool geometries. ## **1. Chemical Composition (Nominal %)** S6's composition is optimized for maximum toughness at high hardness through very high silicon and a balanced alloy system. | Element | Content (%) | Primary Function | |---------|------------|------------------| | **Carbon (C)** | 0.40 - 0.50 | Provides fundamental hardenability and matrix strength. Balanced to support high hardness without excessive brittleness. | | **Silicon (Si)** | **2.00 - 2.50** | **Primary element.** Exceptionally high silicon content provides unparalleled solid solution strengthening, dramatically increasing toughness, yield strength, and elastic limit. This is the defining feature of S6. | | **Chromium (Cr)** | 1.20 - 1.50 | Enhances hardenability to achieve air-hardening capability, improves wear resistance, and provides oxidation resistance. | | **Tungsten (W)** | 1.50 - 2.50 | Forms hard, wear-resistant carbides and significantly improves hot hardness (red-hardness). | | **Molybdenum (Mo)** | 0.30 - 0.50 | Further increases hardenability, refines grain structure, and improves toughness and tempering resistance. | | **Manganese (Mn)** | 0.30 - 0.50 | Supports hardenability. | | **Vanadium (V)** | ≤ 0.25 | Grain refiner and strengthens carbides. | | **Iron (Fe)** | Balance | Base metal. | **Key Chemistry Note:** S6 is a **high-alloy shock steel** that combines the **extreme toughness of ultra-high silicon (like a super S5)** with the **wear resistance and hot hardness of tungsten (like S1)** and the **dimensional stability of air hardening (like S7)**. This makes it one of the most comprehensively alloyed and capable grades in the S-series, designed for the most demanding applications where impact, wear, and heat are all present. ## **2. Physical & Mechanical Properties** *Typical properties in the hardened and tempered condition (~56-58 HRC).* | Property | Typical Value / Condition | |----------|--------------------------| | **Density** | ~7.80 g/cm³ (0.282 lb/in³) | | **Melting Point** | ~1490°C (2715°F) | | **Thermal Conductivity** | ~35 W/m·K (Relatively low due to high alloy content) | | **Coefficient of Thermal Expansion** | ~11.8 × 10⁻⁶/K (20-100°C) | | **Modulus of Elasticity** | 210 GPa (30.5 × 10⁶ psi) | | **Annealed Hardness** | 207-241 HB | | **As-Quenched Hardness (Air)** | ~60-62 HRC | | **Hardened & Tempered Hardness** | **56-60 HRC** (Common working range, can maintain toughness at higher hardness than other S-grades). | | **Tensile Strength** | ~1950-2100 MPa (283-305 ksi) at 58 HRC | | **Yield Strength (0.2%)** | ~1700-1850 MPa (247-268 ksi) | | **Impact Toughness (Charpy V-Notch)** | **Excellent to Outstanding.** Typically **50-80 J (37-59 ft-lbf)** at 58 HRC. **This is its key achievement: maintaining very high toughness at a hardness level where most other steels would be brittle.** | | **Wear Resistance** | **Very Good.** Superior to S5 and S7 due to tungsten carbides. | | **Hot Hardness / Red Hardness** | **Very Good.** Tungsten provides stability at elevated temperatures. | | **Machinability (Annealed)** | **Poor.** The high silicon content makes it gummy and abrasive to cutting tools. | | **Grindability** | Fair to Difficult. | | **Dimensional Stability** | **Excellent (Air-Hardening).** Minimal distortion and low risk of quench cracking. | ## **3. International Standards & Cross-References** S6 is a less common but specialized grade with international recognition. | Standard | Designation | Notes | |----------|------------|-------| | **UNS** | T41906 | | | **AISI/ASTM (USA)** | S6 (ASTM A681) | | | **ISO (International)** | **~45WCrSiV8-2** (ISO 4957: Tool steels) - Reflects the high Si, W, Cr content. | | | **DIN (Germany)** | **1.2714** | A close equivalent (55NiCrMoV7) is different; S6's true DIN equivalent is not a perfect 1:1 match but shares the high-Si concept. | | **BS (UK)** | No direct common equivalent. | | | **JIS (Japan)** | No direct common equivalent. | | | **GB (China)** | **6CrW2MoSiV** (Approximate conceptual equivalent) | | | **Common Name** | **High-Silicon Air-Hardening Shock Steel** | | ## **4. Product Applications** S6 is reserved for the most demanding applications where tools must withstand **brutal impact while maintaining a hard, wear-resistant edge**, often in challenging thermal environments. **Primary Applications:** * **Extreme-Duty Cold Work Tools:** * **Heavy-duty shear blades** for cutting tough alloys, wire rope, and thick sections. * **Cold chisels and punches** for the most severe service. * **Driver bits for high-torque impact wrenches** in heavy industry. * **Hot Work Tools:** * **Hot chisels, hot cuts, and hot punches** for forging and blacksmithing. Its hot hardness is a key advantage here. * **Hot shear blades** for cutting at elevated temperatures. * **High-Stress Die Components:** * **Punch and die inserts** for cold forging and extrusion where impact fatigue is a failure mode. * **Wear plates and guides** in high-impact machinery. * **Mining and Drilling:** * **Picks and bits** for hard rock mining where both abrasion and impact shock are present. * **Specialty Knives:** * **Chopper blades and survival knives** requiring a hard edge that can withstand impact without chipping. ## **5. Heat Treatment Guidelines** S6's high silicon content requires careful heat treatment to avoid decarburization, but its air-hardening nature simplifies quenching. * **Annealing:** Heat to 790-815°C (1450-1500°F), slow furnace cool. Annealed hardness: 207-241 HB. * **Hardening:** 1. **Preheating:** Preheat to **650-700°C (1200-1290°F)**. Essential for dimensional stability. 2. **Austenitizing:** Heat to **900-925°C (1650-1695°F)**. The high silicon and chromium allow a higher austenitizing temperature for better carbide solutioning. Soak for 20-30 min per inch. 3. **Quenching:** **Cool in still or forced air.** For very large sections or maximum hardness, oil quenching can be used but increases distortion risk. * **Tempering:** * **Temper immediately** after reaching near room temperature. * Temper at **205-425°C (400-800°F)**. For the optimal balance of hardness and toughness at ~58 HRC, temper at **370-425°C (700-800°F)**. * **Double or triple tempering is strongly recommended** to ensure stress relief and transformation of retained austenite. * **Note:** Due to high silicon, avoid prolonged exposure in the **250-350°C (480-660°F)** tempering range to minimize the risk of tempered martensite embrittlement. ## **6. Comparative Advantages & Niche** S6 occupies a unique, high-performance niche: * **vs. S5:** S6 achieves **similar or better toughness at a higher hardness** and has **far better wear resistance and hot hardness** due to tungsten. It is also **air-hardening** vs. oil-hardening. * **vs. S7:** S6 can achieve **higher working hardness** (58-60 HRC vs. S7's optimal 54-57 HRC) with **comparable toughness**, and has **better wear resistance**. * **vs. S1:** S6 has **better toughness at equivalent hardness** and the **major advantage of air hardening**. **Conclusion:** AISI S6 is a **premium, high-alloy shock steel** for solving the most severe tooling problems. Its combination of ultra-high silicon for toughness, tungsten for wear/hot hardness, and air-hardening for stability makes it a top-tier choice when cost is secondary to ultimate performance under extreme conditions of impact, abrasion, and moderate heat. --- **Disclaimer:** The **very high silicon content** of S6 makes it **highly susceptible to decarburization**. Austenitizing must be done in a protective atmosphere (vacuum, controlled atmosphere) or with adequate stock allowance for grinding. Its poor machinability in the annealed state increases fabrication costs. S6 is a specialized material requiring expertise in heat treatment and application engineering. It should only be specified when the performance requirements cannot be met by more common grades like S5 or S7. Always consult the material producer's exact heat treatment specifications. -:- For detailed product information, please contact sales. -: AISI Type S6 Shock Resisting Tool Steel (UNS T41906) Specification Dimensions Size： Diameter 20-1000 mm Length <6763 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 S6 Shock Resisting Tool Steel (UNS T41906) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type S6 Shock Resisting Tool Steel Flange (UNS T41906) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type S6 Shock Resisting Tool Steel Flange (UNS T41906) -:- For detailed product information, please contact sales. -:

Packing of AISI Type S6 Shock Resisting Tool Steel Flange (UNS T41906) -:- 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 3234 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