AISI Type S4 Shock Resisting Tool 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. -: AISI Type S4 Shock Resisting Tool Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI Type S4 Shock Resisting Tool Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI Type S4 Shock Resisting Tool Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type S4 Shock-Resisting Tool Steel** ## **Overview** **AISI S4** is a historical **silicon-manganese-chromium water-hardening shock-resisting tool steel**. Developed for applications demanding **very high toughness under severe impact**, S4's composition leverages a significant **silicon and manganese content** to achieve exceptional shock absorption. However, it is critical to note that **AISI S4 is not a standard grade in modern AISI/ASTM specifications (ASTM A681)** and appears primarily in historical or specialized contexts. Its legacy lies as a predecessor to more optimized and reliable shock steels like **S2 and S5**. ## **1. Historical Chemical Composition (Nominal %)** Based on historical references, the composition of S4 focused on toughness via silicon and manganese. | Element | Historical Content (%) | Primary Function | |---------|-----------------------|------------------| | **Carbon (C)** | 0.50 - 0.60 | Provides basic hardenability and strength. Slightly higher carbon than S2 for more hardness potential. | | **Silicon (Si)** | 1.75 - 2.25 | **Very High.** Primary element for extreme toughness via solid solution strengthening. Increases yield strength dramatically. | | **Manganese (Mn)** | 0.60 - 0.90 | **High.** Works synergistically with silicon to increase hardenability and toughness. | | **Chromium (Cr)** | 0.20 - 0.40 | Added to improve hardenability depth and provide slight wear enhancement. | | **Molybdenum (Mo)** | ≤ 0.10 | Typically minimal or absent. | | **Iron (Fe)** | Balance | Base metal. | **Key Chemistry Note:** S4 was essentially a **"Super S2"**, with nearly **double the silicon content** and higher manganese. This created an extremely tough, strong ferrite matrix. However, the **very high silicon content (>2%)** introduced significant challenges: * **Severe Decarburization:** Silicon promotes rapid surface decarburization during heat treatment, leading to soft skins. * **Grinding & Machining Difficulty:** High silicon can make the annealed steel abrasive and tough to machine. * **Brittleness Risk:** If not properly heat treated, the high silicon could contribute to brittleness. These drawbacks likely contributed to its obsolescence in favor of steels with better overall processability. ## **2. Inferred Physical & Mechanical Properties** *Inferred properties if heat treated to a typical working hardness (~54-56 HRC).* | Property | Estimated Typical Value | |----------|-------------------------| | **Hardness (Annealed)** | ~192-229 HB | | **Hardened & Tempered Hardness** | **54-58 HRC** (Capable of high hardness but optimized for toughness). | | **Tensile Strength** | Very High (>1900 MPa at 56 HRC) due to silicon strengthening. | | **Impact Toughness (Charpy V-Notch)** | **Exceptionally High (Theoretical).** Designed to exceed S2, potentially rivaling the best. | | **Wear Resistance** | **Moderate to Low.** Relies on matrix hardness; lacks significant carbide formers. | | **Hot Hardness** | Moderate (silicon provides some retention). | | **Machinability (Annealed)** | **Poor.** High silicon content makes it gummy and abrasive. | | **Hardenability** | Moderate (Water-Hardening). Deep for a water-hardening steel due to Mn and Si, but still requires vigorous quenching. | ## **3. Historical & Approximate Cross-References** Given its non-standard status, direct equivalents are rare. | Source | Designation / Context | Notes | |--------|----------------------|-------| | **Historical AISI** | S4 | Obsolete designation. | | **Modern AISI/ASTM** | **Not Listed** (ASTM A681). | | | **Possible Conceptual Successors** | **S2, S5, S7** | Modern grades that offer better balances of toughness, hardenability, and processability. | | **Specialty/Proprietary** | Some proprietary high-silicon shock steels may exist. | | | **Common Description** | **High-Silicon Manganese Shock Steel** | | ## **4. Historical & Potential Applications** Based on its inferred properties, S4 would have been used for the most demanding impact applications where **toughness was the singular most important property**. **Theoretical/Historical Applications:** * **Extreme-Duty Chisels and Punches:** For work on very hard or unpredictable materials. * **Heavy Shear Blades:** For cutting thick, tough material where shock loading was extreme. * **Pneumatic Tool Components:** Such as the most heavily stressed parts of jackhammers or rivet busters. * **Springs and High-Stress Springs** in tooling (benefiting from silicon's high elastic limit). * **Anvils and Hammer Heads** for specialized forging. ## **5. Heat Treatment Challenges (Historical Context)** Heat treating S4 would have been demanding: 1. **Decarburization Control:** Required protective atmospheres or pack methods during austenitizing to prevent severe surface softening. 2. **Quenching:** As a water-hardening steel, required brine or water quench with high risk of cracking, especially given its likely high hardenability from Mn/Si. Interrupted quenches would be critical. 3. **Tempering:** Likely required tempering at relatively high temperatures (e.g., 425-540°C / 800-1000°F) to achieve its optimal toughness-hardness balance and relieve the high internal stresses from quenching. ## **6. Modern Perspective & Why It's Obsolete** S4 represents an interesting but ultimately impractical branch of tool steel development. Its decline can be attributed to the rise of superior alternatives: 1. **S2 (Si-Mo):** Offers excellent toughness with **molybdenum for better hardenability and grain control**, and a more manageable silicon level (~1.0%), improving machinability and decarb resistance. 2. **S5 (Mn-Si):** Provides outstanding toughness with a better manufacturing profile. 3. **S7 (Cr-Mo):** An **air-hardening** grade that provides extreme toughness with **minimal distortion and no decarburization worries** during heat treatment. This is the most significant advancement, making water-hardening shock steels largely obsolete for critical applications. 4. **Advanced Metallurgy:** Modern vacuum melting allows for cleaner steels with better inherent toughness, reducing the need for extreme alloying like >2% Si. **Conclusion:** AISI S4 is a **historical footnote** in the evolution of shock-resistant tool steels. It embodied a pure, high-silicon approach to achieving maximum toughness but was hampered by significant manufacturing and heat treatment difficulties. For any contemporary application, **S2, S5, or S7** should be evaluated, as they deliver exceptional impact resistance with vastly improved reliability, processability, and consistent results. --- **Disclaimer:** Information on AISI S4 is based on limited historical references and metallurgical inference. **It is not a currently standardized, commercially available tool steel.** This profile is provided for educational and historical context only. For any tooling design requiring shock resistance, consult specifications for modern, standardized grades such as AISI S2, S5, or S7. -:- For detailed product information, please contact sales. -: AISI Type S4 Shock Resisting Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6759 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 S4 Shock Resisting Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type S4 Shock Resisting Tool Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type S4 Shock Resisting Tool Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI Type S4 Shock Resisting Tool 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 3230 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