JIS SK5 Water Hardening 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. -: JIS SK5 Water Hardening Tool Steel Flange Product Information -:- For detailed product information, please contact sales. -: JIS SK5 Water Hardening Tool Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

JIS SK5 Water Hardening Tool Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Datasheet: JIS SK5 Water-Hardening Tool Steel** --- #### **1. Product Overview** **JIS SK5** is a very high-carbon, non-alloy tool steel specified under the Japanese Industrial Standard (JIS) G 4401 for carbon tool steels. It belongs to the **water-hardening (W-group)** family and represents the highest standard carbon content (typically 0.80-0.90% C) among commonly used SK grades before reaching the extremely brittle range. SK5 is renowned for its capacity to achieve an exceptional combination of **high surface hardness** and **good wear resistance** after water quenching, while retaining marginally better toughness and shock resistance than the highest carbon grades like SK3. It is a cost-effective solution for applications demanding a durable, sharp cutting edge where extreme hardness is paramount but some resistance to chipping is still required. --- #### **2. International Standard Cross-Reference** JIS SK5 has direct equivalents in other major international standards due to its well-defined composition and common application. | Standard System | Equivalent Grade | Key Similarity | | :--- | :--- | :--- | | **JIS (Japan)** | **SK5** | Defining Standard | | **ASTM (USA)** | W1-0.9C / W109 | Similar high-carbon water-hardening grade | | **DIN (Germany)** | C90W1 / 1.1740 | Similar carbon content and application | | **BS (UK)** | BW1B (0.9C variant) | Water-hardening tool steel type | | **ISO** | TC90 | ISO designation for similar composition | | **GB (China)** | **T9(A)** | Nearly identical carbon content and properties | | **AISI/SAE (USA)** | 1095 (modified for tools) | Similar carbon range, often used for springs and blades | --- #### **3. Chemical Composition (Typical, weight % JIS G 4401)** The composition features a very high carbon content with minimal alloying elements, characteristic of plain carbon tool steels. | Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | | :--- | :--- | :--- | :--- | :--- | :--- | | **Content (%)** | 0.80 - 0.90 | ≤ 0.35 | ≤ 0.50 | ≤ 0.030 | ≤ 0.030 | *Note: Chromium (Cr) and Nickel (Ni) may be present in trace amounts as residual elements, typically ≤0.25% and ≤0.25% respectively, but are not intentionally added for alloying effects.* --- #### **4. Physical & Mechanical Properties** * **Density:** Approximately 7.85 g/cm³ * **Thermal Conductivity:** Moderate. * **Machinability (Annealed State):** Fair. The high carbon content makes it more difficult to machine than low-carbon steels, but it remains better than many alloy tool steels in its fully annealed, spheroidized condition. * **Hardenability:** **Very Low (Shallow Hardening).** Like other water-hardening steels, it achieves high hardness primarily at the surface, with a rapidly decreasing hardness profile towards the core. The core remains relatively softer and tougher. * **Quenching Medium:** **Water, Brine, or Caustic Soda Solution.** An aggressive quench is required to achieve full hardness, which inherently carries a significant risk of distortion and quench cracks, especially in parts with non-uniform cross-sections. * **Typical Achievable Hardness:** * **Annealed State:** ~ 187 - 217 HB * **Hardened & Tempered State:** **62 - 65 HRC** (Dependent on exact carbon content within the range and heat treatment precision). --- #### **5. Heat Treatment** * **Forging:** Heat uniformly to 1050-850°C. Cool slowly in sand, ashes, or a furnace after forging to prevent cracking. * **Annealing:** Heat to 750-780°C, soak thoroughly, then furnace cool slowly (≤20°C/hour) to approximately 550°C, followed by air cooling. This produces a soft, pearlitic or spheroidized structure ideal for machining. * **Hardening:** 1. **Preheat:** Always preheat at 650-700°C to minimize thermal shock. 2. **Austenitizing:** 780-810°C. Soak time: approximately 20-30 minutes per inch of thickness. 3. **Quench:** Agitate vigorously in **water, brine (5-10%), or a polymer solution.** Brine provides the fastest cooling and highest hardness but also the highest stress. * **Tempering:** **Must be performed immediately** after quenching (when the part is cool enough to handle, ~50-70°C). Typical tempering range is **150-200°C for 1-2 hours**. Tempering within this range relieves quenching stresses with minimal loss of hardness. --- #### **6. Product Applications** SK5 is ideally suited for tools that require a keen, wear-resistant edge and are subject to moderate abrasion but not severe impact or high temperatures. * **Cutting & Slitting Tools:** **Hand saw blades (for wood and metal), garden shear blades, paper cutters, leather knives, and industrial slitter knives.** * **Stamping & Forming Tools:** **Simple punches, dies, and blanking tools** for thin gauge materials like aluminum, copper, brass, and cardboard. * **Hand Tools:** **Chisels (wood and cold), screwdriver tips for high-torque applications, and scrapers.** * **Agricultural Tools:** **Scythes, sickles, and hoe blades.** * **Springs & Wear Parts:** **Flat springs, lock parts, and hardened washers** where high elastic limit and wear resistance are needed. * **Blades:** **Industrial blades for cutting rubber, textiles, and plastics.** --- #### **7. Advantages & Limitations** | Advantages | Limitations | | :--- | :--- | | • **Lower cost** compared to alloy tool steels.
• **Capable of very high surface hardness** and excellent sharpness.
• **Good wear resistance** in non-shock applications.
• **Simple heat treatment process** that doesn't require special atmosphere furnaces.
• **Easier to forge and machine in annealed state** than many high-alloy steels. | • **Very Poor Hardenability:** Only surface hardens; unsuitable for thick sections (>10-12mm often problematic).
• **High Risk of Distortion & Quench Cracking:** Due to severe water quenching required.
• **Poor Toughness & Impact Resistance:** Brittle at full hardness; prone to chipping.
• **Very Low Red (Hot) Hardness:** Hardness deteriorates rapidly above 150-200°C; completely unsuitable for high-speed or hot work.
• **Dimensional instability** during heat treatment compared to oil-hardening grades. | --- #### **8. Selection Guidance** * **Choose SK5 when:** You need maximum hardness and wear resistance on a budget, for simple-shaped tools, and where the tool will be used at room temperature without heavy impact. * **Consider an alternative when:** * The tool has complex geometry or variable thickness → Use **oil-hardening steel (e.g., SKS93, O1).** * The tool requires good toughness and shock resistance → Use **shock-resisting steel (e.g., SKS4, S7).** * The tool operates at elevated temperatures or high speeds → Use **high-speed steel (e.g., SKH51, M2).** * You require deep, uniform hardening in thicker sections → Use **medium-alloy air-hardening steel (e.g., SKD11, A2).** **Conclusion:** JIS SK5 is a classic, economical **water-hardening tool steel** that offers an outstanding **hardness-to-cost ratio** for a well-defined range of applications. Its successful implementation is highly dependent on **skillful heat treatment** to manage its inherent quenching risks. It remains a fundamental material for manufacturing a wide variety of **low-stress cutting, forming, and wear components** where its limitations can be effectively designed around. For more demanding applications, moving to alloy tool steels is strongly recommended. -:- For detailed product information, please contact sales. -: JIS SK5 Water Hardening Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6792 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. -: JIS SK5 Water Hardening Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of JIS SK5 Water Hardening Tool Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers JIS SK5 Water Hardening Tool Steel Flange -:- For detailed product information, please contact sales. -:

Packing of JIS SK5 Water Hardening 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 3263 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