JIS SK1 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 SK1 Water Hardening Tool Steel Flange Product Information -:- For detailed product information, please contact sales. -: JIS SK1 Water Hardening Tool Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

JIS SK1 Water Hardening Tool Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: JIS SK1 Water Hardening Tool Steel** ## **Overview** **JIS SK1** is a **high-carbon, non-alloyed water-hardening tool steel** defined by the Japanese Industrial Standards (JIS). It is the **highest carbon grade within the JIS SK series (carbon tool steels)**, designed to achieve **maximum hardness** for applications requiring an extremely sharp, wear-resistant edge. As a plain carbon steel with minimal alloying, SK1 is characterized by **very shallow hardenability, low toughness, and the necessity for a severe water or brine quench**. It is the Japanese equivalent to steels like **AISI W1-1.4C** and is traditionally used for files, cutting tools, and other implements where supreme hardness is prioritized over impact resistance. ## **1. Chemical Composition (JIS G 4401 Standard)** SK1's composition is simple, with carbon as the dominant element. | Element | Content (%) | Primary Function | |---------|------------|------------------| | **Carbon (C)** | **1.30 - 1.50** | **The defining element.** Very high carbon content ensures maximum achievable hardness (up to ~67 HRC) and forms a high volume of hard cementite for abrasion resistance. | | **Silicon (Si)** | ≤ 0.35 | Deoxidizer. | | **Manganese (Mn)** | ≤ 0.50 | Slightly increases hardenability but kept low. | | **Phosphorus (P)** | ≤ 0.03 | Impurity, kept low. | | **Sulfur (S)** | ≤ 0.03 | Impurity, kept low. | | **Chromium (Cr)** | ≤ 0.30 | May be present residually; not an intentional alloying element. | | **Nickel (Ni)** | ≤ 0.25 | May be present residually. | | **Copper (Cu)** | ≤ 0.25 | May be present residually. | | **Iron (Fe)** | Balance | Base metal. | **Key Chemistry Note:** SK1 is essentially a **very high-carbon steel** (hypereutectoid). Its **carbon content (1.3-1.5%)** is its most critical feature, placing it at the upper practical limit for carbon tool steels. This results in a microstructure containing a **large network of primary cementite** alongside pearlite/martensite, contributing to extreme wear resistance but also significant brittleness. The **near absence of grain-refining elements (like V)** means careful heat treatment control is required to prevent coarse grain growth. ## **2. Physical & Mechanical Properties** *Typical properties in the hardened and tempered condition.* | Property | Typical Value / Condition | |----------|--------------------------| | **Density** | ~7.85 g/cm³ | | **Melting Point** | ~1470°C (2680°F) | | **Thermal Conductivity** | ~48 W/m·K | | **Coefficient of Thermal Expansion** | ~12.3 × 10⁻⁶/K (20-100°C) | | **Modulus of Elasticity** | 205-210 GPa | | **Annealed Hardness** | 201-229 HB | | **As-Quenched Hardness (Water)** | **Up to 66-68 HRC** (Theoretical maximum for steel). | | **Hardened & Tempered Hardness** | **62-66 HRC** (Common working range for files/cutting edges). Tempering is often done at low temperatures (150-200°C) to retain hardness. | | **Tensile Strength** | Very high (>2000 MPa) but with negligible ductility. | | **Impact Toughness** | **Very Low.** Extremely brittle; tools are prone to chipping or fracture under shock load. | | **Wear Resistance (Abrasion)** | **Excellent** due to high hardness and cementite volume. | | **Hardenability** | **Extremely Shallow.** Effective hardening depth is only **1-3 mm**. Thicker sections will have a hard case over a soft core. | | **Hot Hardness** | **Very Poor.** Rapid softening above **~200°C (390°F)**. | | **Machinability (Annealed)** | Fair to Poor. High carbon content makes it abrasive and can be gummy. | | **Grindability** | Fair. | ## **3. International Standards & Cross-References** | Standard | Designation | Notes | |----------|------------|-------| | **JIS** | **SK1** (JIS G 4401) | | | **AISI (USA)** | **~W1-13, W1-14** (AISI W1 with 1.3-1.4% C) | The closest direct equivalent. | | **ISO (International)** | **~C140U** (ISO 4957) | | | **DIN (Germany)** | **~C140W2** (1.1840) | High-carbon water-hardening steel. | | **BS (UK)** | **~BW1B** (High-carbon variant) | | | **GB (China)** | **T12, T13** (Carbon tool steel, though carbon ranges differ slightly) | | | **Common Name** | **1.4% Carbon Tool Steel, File Steel** | | ## **4. Product Applications** SK1 is used almost exclusively for applications where **extreme hardness and abrasion resistance are paramount**, and the tool is used in a stable, non-impact manner. **Primary Applications:** * **Files and Rasps:** The **classic application**. For machining and finishing hard metals. * **Cutting Blades and Knives:** For cutting soft metals, wood, paper, and plastics where a very sharp, hard edge is needed but shock loading is minimal (e.g., hand plane blades, some knives). * **Lathe Tools:** For precision finishing cuts on soft materials. * **Scrapers and Burnishing Tools.** * **Measuring Tools:** Surface plates, straight edges where dimensional stability and wear resistance are key. * **Metal Stamping Punches** for thin, soft materials (low volume). **Applications to Avoid:** * Any tool subject to impact or bending (cold chisels, punches for thick material). * Tools with complex shapes or sharp corners (high quench cracking risk). * High-temperature applications. * Tools requiring deep, uniform hardness. ## **5. Heat Treatment Guidelines** Heat treating SK1 is a high-skill operation due to its high carbon content and water-quenching requirement. * **Annealing:** Heat to **740-760°C (1365-1400°F)**, hold, then furnace cool very slowly to produce a spheroidized structure for machinability. * **Hardening:** 1. **Preheating:** **Essential.** Preheat slowly to **700-750°C (1290-1380°F)** to minimize thermal shock. 2. **Austenitizing:** Heat to **760-800°C (1400-1470°F).** Use the **lower end of this range** (760-780°C) to minimize grain growth and distortion. Soak for 10-20 minutes per inch. 3. **Quenching:** Quench **immediately in agitated water or brine (5-10% NaCl).** For anything other than simple shapes, an **interrupted quench** is mandatory: quench in brine until the part cools to **~300-400°C (570-750°F)** (sizzling stops, color black), then transfer immediately to oil or air. * **Tempering:** * **Temper immediately** (within 30 minutes). * To retain high hardness (64-66 HRC), temper at a **low temperature: 150-180°C (300-355°F)** for 1-2 hours. * For slightly better toughness at the expense of hardness, temper at **200-250°C (390-480°F)**. * **Avoid tempering between ~250-350°C (480-660°F)** where tempered martensite embrittlement is severe in high-carbon steels. * **Double tempering** is recommended. ## **6. Key Advantages & Severe Limitations** **Advantages:** * **Can achieve the highest possible hardness** of any standard tool steel. * **Low material cost.** * **Excellent abrasion resistance** for its cost. * **Simple metallurgy.** **Severe Limitations:** * **Extremely Brittle:** Very low impact toughness. * **Very Shallow Hardenability:** Useless for thick sections. * **Extreme Quenching Risk:** Very high susceptibility to cracking and distortion during water quenching. * **Poor Machinability** in annealed state compared to lower-carbon steels. * **No Thermal Resistance:** Loses hardness at low temperatures. * **Obsolete for Most Industrial Applications:** The risks and limitations far outweigh the advantages for all but a few niche, traditional uses. **Modern Context:** For most applications where SK1 was historically used, **alloy tool steels offer far superior solutions.** * For files and abrasive wear: **AISI D2 (12% Cr)** or specialty **powder metallurgy steels** offer better wear life and toughness. * For cutting edges: **AISI O1 or A2** provide better toughness, deeper hardening, and safer heat treatment. * SK1 remains in use primarily for **traditional file manufacturing** and specific hand tools where its performance is deeply entrenched in practice. --- **Disclaimer:** Heat treating JIS SK1 is a **high-risk process** suitable only for experienced practitioners. The combination of very high carbon and water quenching makes it one of the most crack-prone tool steels. **It is not recommended for any new, critical, or complex tool designs.** For general toolmaking, always prefer oil-hardening (O1) or air-hardening (A2, D2) steels. This profile describes the material's traditional characteristics; successful application requires accepting its inherent brittleness and manufacturing difficulties. -:- For detailed product information, please contact sales. -: JIS SK1 Water Hardening Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6785 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 SK1 Water Hardening Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of JIS SK1 Water Hardening Tool Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers JIS SK1 Water Hardening Tool Steel Flange -:- For detailed product information, please contact sales. -:

Packing of JIS SK1 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 3256 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