Crucible Steel Sheet,Plate,CSM® 420 XL Stainless Steel Sheet,Plate

Crucible Steel Sheet/Plate CSM® 420 XL Stainless Steel Sheet/Plate Product Information -:- For detailed product information, please contact sales. -: Crucible Steel Sheet/Plate CSM® 420 XL Stainless Steel Sheet/Plate Synonyms -:- For detailed product information, please contact sales. -:

Crucible Steel CSM® 420 XL Stainless Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Crucible CSM® 420 XL Stainless Steel** Crucible CSM® 420 XL is a premium, modified martensitic stainless steel produced via Crucible's advanced melting and processing techniques. Engineered to deliver a superior combination of properties compared to conventional 420-grade stainless steels, the "XL" designation signifies its **enhanced toughness, improved ductility, and excellent corrosion resistance**, making it an ideal choice for critical applications requiring high strength, good wear characteristics, and reliable performance in demanding environments. This grade is specifically designed to overcome the traditional limitations of standard 420 stainless steel—namely brittleness and limited ductility at higher hardness levels. Through precise control of carbon content and the addition of elements like Vanadium, CSM 420 XL achieves a refined microstructure that provides **better impact resistance, improved fatigue strength, and superior polishability**. It is a versatile material suitable for applications where both corrosion resistance and mechanical integrity are paramount. --- ## **1. Chemical Composition (Weight %)** The chemistry of CSM 420 XL is a carefully balanced modification of the standard AISI 420 composition, optimized for enhanced performance. | **Element** | **Carbon (C)** | **Chromium (Cr)** | **Vanadium (V)** | **Molybdenum (Mo)** | **Silicon (Si)** | **Manganese (Mn)** | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | **0.33 - 0.43** | **12.0 - 14.0** | **≥ 0.15** | **≤ 1.00** | **≤ 1.00** | **≤ 1.00** | | **Role** | Optimized for a balance of hardness and toughness. Lower than some 420 variants to improve ductility while maintaining good hardenability. | Primary element providing **martensitic hardenability** and **corrosion resistance** through the formation of a passive chromium oxide layer. | **Key modifier.** Refines grain structure, improves toughness and fatigue strength, and forms fine carbides that enhance wear resistance without compromising ductility. | Enhances hardenability, improves resistance to pitting corrosion, and increases strength at elevated temperatures. | Deoxidizer and solid solution strengthener. | Aids in deoxidation and improves hot workability. | *Note: Iron (Fe) constitutes the remainder. Sulfur (S) and Phosphorus (P) are kept at low levels to maximize purity and performance.* --- ## **2. Physical & Mechanical Properties** *Typical properties after hardening and tempering to common working hardness levels (48-52 HRC).* * **Density:** ~7.75 g/cm³ (0.280 lb/in³) * **Modulus of Elasticity:** ~200 GPa (29 x 10⁶ psi) * **Thermal Conductivity:** ~25 W/m·K at 100°C * **Coefficient of Thermal Expansion:** ~10.5 x 10⁻⁶/°C (20-100°C) * **Corrosion Resistance:** **Good.** Offers significantly better corrosion resistance than standard tool steels (like D2) and good general resistance in mild atmospheric, fresh water, and some chemical environments. Superior to 420 due to controlled microstructure. * **Hardness (Typical Working Range):** **48 - 55 HRC.** Can be hardened to higher levels, but is most commonly and optimally used in the **48-52 HRC** range to maximize its trademark toughness-corrosion balance. * **Toughness & Ductility:** **Excellent (for its hardness and class).** The "XL" enhancement provides significantly higher impact toughness and better elongation than conventional 420 stainless, reducing the risk of brittle fracture. * **Fatigue Strength:** **Very Good.** The refined, clean microstructure with vanadium addition contributes to high endurance limits, making it suitable for cyclic loading applications. * **Wear Resistance:** **Good.** Provides adequate wear resistance for many applications, though not at the level of high-carbon, high-chromium tool steels. Can be surface-hardened for improved wear. * **Polishability:** **Excellent.** Capable of achieving a very high-quality, mirror-like surface finish, which is critical for plastic molding and aesthetic applications. --- ## **3. Heat Treatment** Proper heat treatment is essential to unlock the optimal properties of CSM 420 XL. * **Annealing:** Heat to 840-900°C (1545-1650°F), slow cool in furnace. Annealed hardness: ≤ 235 HB. * **Preheating:** Recommended at 730-790°C (1350-1450°F) to minimize distortion and thermal stress. * **Austenitizing:** **980-1050°C (1795-1920°F).** A common temperature is **1010-1030°C (1850-1885°F)**. Soak time must be sufficient for complete austenitization. * **Quenching:** **Oil quench** is standard for most sections to achieve full hardness. For complex parts, high-pressure gas quenching can be used to minimize distortion. * **Tempering:** **Mandatory.** Must be tempered immediately after quenching. **Typical tempering range: 150-370°C (300-700°F)** to achieve the desired hardness and toughness. Tempering above 370°C (700°F) is possible but will significantly reduce hardness. Multiple tempers are often beneficial for stability. * **Sub-Zero Treatment:** Optional but can be applied after quenching to transform retained austenite and increase dimensional stability and maximum hardness. --- ## **4. Key Applications** CSM 420 XL is designed for high-performance applications where stainless properties, strength, and toughness are required. * **Plastic Injection Molds & Molding Components:** Cavities, cores, ejector pins, and hot runner components where corrosion resistance from plastic additives or condensation and good polishability are critical. * **Precision Machinery Components:** Gears, shafts, bearings, and valve parts operating in mildly corrosive environments. * **Cutlery & Surgical Instruments:** High-quality knives and surgical tools requiring a balance of edge retention, corrosion resistance, and ease of sharpening. * **Food Processing Equipment:** Components like mixer blades, cutter heads, and wear plates where hygiene, corrosion resistance, and strength are important. * **General Purpose Stainless Tooling:** Jigs, fixtures, and gauges that require dimensional stability and resistance to rust in workshop environments. --- ## **5. International Standards & Cross-References** CSM 420 XL is a proprietary modified grade. It is based on but superior to standard AISI 420. * **AISI/SAE:** Modified **420** (with Vanadium addition). Closest standard grade: **420**. * **UNS:** S42000 (as a reference, though composition differs) * **European (EN):** **1.4021** (X20Cr13) / **1.4028** (X30Cr13) are similar but lack vanadium. The closest direct equivalent in concept might be a modified **1.4034**. * **Japanese (JIS):** **SUS420J2** (similar carbon range, but vanadium-modified). * **Common Trade Names/Equivalents:** Often compared to other "premium" or "modified" 420 grades from other manufacturers, such as Uddeholm Stavax ESR or similar high-quality mold steels. --- ## **6. Advantages & Limitations** **Advantages:** * **Enhanced Toughness & Ductility:** The primary "XL" benefit, offering greater resistance to chipping and fracture than standard 420. * **Good Corrosion Resistance:** Suitable for many industrial and consumer environments where tool steels would rust. * **Excellent Polishability & Surface Finish:** Ideal for high-gloss plastic parts and aesthetic applications. * **Good Balance of Properties:** Provides a reliable combination of hardness, strength, and corrosion resistance without extreme specialization. * **Good Machinability (Annealed State):** Easier to machine than many high-alloy tool steels. **Limitations:** * **Moderate Wear Resistance:** Not suitable for highly abrasive applications without surface treatment (e.g., nitriding). * **Limited Maximum Hardness:** While hardenable, it is not designed for extreme hardness levels (>55 HRC) where wear resistance is the sole priority. * **Not for Severe Corrosive Environments:** Not as corrosion-resistant as austenitic (300 series) or high-chromium stainless steels. * **Requires Heat Treatment:** Must be properly hardened and tempered to achieve its designed properties. --- ## **7. Summary** **Crucible CSM® 420 XL Stainless Steel is a high-performance, martensitic stainless steel engineered for reliability in demanding applications.** By refining the classic 420 chemistry with vanadium and precise processing, it delivers a superior combination of toughness, corrosion resistance, and polishability that standard grades cannot match. It is an excellent choice for plastic mold makers, precision engineers, and manufacturers who require a material that performs consistently under mechanical stress in environments where corrosion is a concern, without the brittleness often associated with hardenable stainless steels. -:- For detailed product information, please contact sales. -: Crucible Steel CSM® 420 XL Stainless Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6963 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. -: Crucible Steel CSM® 420 XL Stainless Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Crucible Steel Sheet,Plate CSM® 420 XL Stainless Steel Sheet,Plate -:- For detailed product information, please contact sales. -: Chemical Identifiers Crucible Steel Sheet,Plate CSM® 420 XL Stainless Steel Sheet,Plate -:- For detailed product information, please contact sales. -:

Packing of Crucible Steel Sheet/Plate CSM® 420 XL Stainless Steel Sheet/Plate -:- 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 Sheet/Plate 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 3434 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