JIS SWRCH20A Carbon Steel Foil/Strip

JIS SWRCH20A Carbon Steel Foil Product Information -:- For detailed product information, please contact sales. -: JIS SWRCH20A Carbon Steel Foil Synonyms -:- For detailed product information, please contact sales. -:

JIS SWRCH20A Carbon Steel Product Information -:- For detailed product information, please contact sales. -: ## **Product Introduction: JIS SWRCH20A Cold Heading Quality Carbon Steel** **JIS SWRCH20A** is a **special cold forging/heading quality carbon steel** wire rod specified by the Japanese Industrial Standards (JIS) system. The designation "SWRCH" stands for **S**teel **W**ire Rod for **C**old **H**eading, with the "A" suffix (Standard Grade) and "20" indicating a nominal carbon content of 0.20%. This grade is engineered specifically for **cold forming processes** such as heading, extrusion, and upsetting. Its chemical composition and production process are optimized to provide excellent ductility, low surface defect rates, and consistent workability under high-strain cold deformation. It is commonly supplied in spheroidized annealed condition to maximize formability, allowing for the production of high-strength, net-shape fasteners and components without the need for intermediate annealing. --- ### **1. Chemical Composition (JIS G 3507-1 Standard)** The composition is precisely controlled to ensure optimal cold forging performance, minimizing risks of cracking or surface flaws. Key elements are as follows (in weight %): | Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | | :------------- | :--------- | :----------- | :------------- | :------------- | :--------- | | **Content (SWRCH20A)** | 0.18-0.23 | ≤ 0.10 | 0.30-0.60 | ≤ 0.030 | **0.040-0.070** | | *Key Feature* | Balanced for strength & formability | **Intentionally Low** to prevent work-hardening and tool wear | Standard range for ductility | Controlled as low as possible | **Controlled Addition** to improve machinability in certain applications. | **Critical Features of the Composition:** * **Low Silicon (Si):** This is a defining characteristic of cold heading steels. Silicon is a potent ferrite strengthener, and its low level (<0.10%) is critical for achieving maximum **softness and ductility**, reducing deformation resistance and die wear during cold forging. * **Sulfur (S) Control:** Sulfur is maintained within a controlled, slightly elevated range (compared to structural steels) to form manganese sulfide (MnS) inclusions. These inclusions can improve **machinability** in secondary operations, but their size and distribution are carefully managed to avoid detrimental effects on transverse properties. * **Cleanliness:** Steelmaking practices for SWRCH grades emphasize high internal and surface cleanliness to prevent seams or inclusions that could lead to failure during forming. --- ### **2. Physical & Mechanical Properties** Properties are primarily defined in the **supplied (spheroidize-annealed) condition**, which is essential for cold heading. **A. Supplied (Spheroidize Annealed) Condition:** * **Hardness:** **≤ 84 HRB** (Typical range: 70-80 HRB). This low hardness is crucial for successful cold forming. * **Tensile Strength (σb):** ~ 400 - 500 MPa (approximate, hardness is the primary control). * **Yield Strength (σ0.2):** ~ 300 - 350 MPa (approximate). * **Elongation (δ):** ≥ 35% (Excellent ductility is a key requirement). * **Microstructure:** **Spheroidized cementite** in a ferritic matrix, providing the optimal structure for high plastic deformation. **B. After Cold Forming and Heat Treatment (e.g., for Fasteners):** * Parts are often **strain-hardened** during forming. * **Final Properties:** Typically achieved via **quenching and tempering** after forming to meet specified mechanical grades (e.g., ISO 898-1 Class 8.8, 10.9). * **Example (for a Class 8.8 bolt):** * Tensile Strength: 800 - 1000 MPa * Yield Strength (Proof Stress): ≥ 640 MPa --- ### **3. Product Applications** JIS SWRCH20A is the fundamental raw material for a vast array of **cold-forged components**, especially in high-volume manufacturing. * **Standard & High-Strength Fasteners:** **Bolts, screws, nuts, studs, and rivets** (commonly heat-treated to Grade 8.8, 10.9). * **Automotive Components:** Various pins, shafts, small gears, and complex-shaped parts produced via cold extrusion. * **Electrical & Hardware:** Screws, nails, and other hardware items. * **General Engineering Parts:** Any symmetrical or axisymmetric part where cold forging offers economic and performance benefits over machining. --- ### **4. International & Equivalent Standards** The SWRCH series has direct functional equivalents in other standards focused on cold heading/wire rod quality. | Standard System | Equivalent / Comparable Grade | Condition / Remark | | :-------------- | :---------------------------- | :----------------- | | **JIS** | **SWRCH20A** | Primary standard (JIS G 3507-1) for basic cold heading quality. | | **ASTM/AISI** | **C1018 / C1020 (Wire Rod Quality)** | Similar carbon content. The key is to specify "cold heading quality" or "rod for forging." | | **SAE** | SAE 1018, SAE 1020 | | | **DIN (EN)** | EN 10263-4: 1C22 | European standard for cold heading and cold extrusion steel. | | **ISO** | ISO 4954: Type CF20 | "CF" denotes steels for cold forging. | | **GB (China)** | ML20 (or SWRCH20A) | "ML" denotes cold heading steel. | **Crucial Note:** Direct equivalence is based on **application purpose (cold heading)** rather than exact chemistry. The **low silicon (<0.10%)** is the critical identifier for cold heading quality. When sourcing, specifying the **JIS SWRCH designation or "Cold Heading Quality"** is more important than just the carbon grade. --- ### **5. Key Advantages & Considerations** **Advantages:** * **Superior Cold Formability:** Optimized chemistry and microstructure allow for severe deformation without cracking. * **High Production Efficiency:** Enables high-speed, net-shape manufacturing with minimal material waste. * **Good Surface Quality:** Produced with strict controls to ensure a surface suitable for demanding cold forging. * **Wide Availability:** A fundamental and widely produced grade in the global fastener and cold forging industry. **Considerations:** * **Not for Direct Use:** Requires subsequent cold forming and usually heat treatment to achieve final mechanical properties. * **Limited Weldability:** The controlled sulfur content and intended use make it generally unsuitable for welding. * **Lower Strength in Annealed State:** Its value is in its formability; strength is imparted later through work-hardening and heat treatment. --- **Disclaimer:** The information provided is for general reference and selection purposes. For engineering design and manufacturing process specification, always consult the official material data sheets from the steel producer. The performance of the final part is dependent on the specific cold forming process, heat treatment parameters, and part design. -:- For detailed product information, please contact sales. -: JIS SWRCH20A Carbon Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5063 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 SWRCH20A Carbon Steel Properties -:- For detailed product information, please contact sales. -:

Applications of JIS SWRCH20A Carbon Steel Foil -:- For detailed product information, please contact sales. -: Chemical Identifiers JIS SWRCH20A Carbon Steel Foil -:- For detailed product information, please contact sales. -:

Packing of JIS SWRCH20A Carbon Steel Foil/Strip -:- 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 Foil/Strip 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 1534 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