InduSteel Tube,Pipe,CLC 1.2738 Prehardened Mold Steel Tube,Pipe (300HB/30HRC) for Thick Sections

InduSteel Tube CLC 1.2738 Prehardened Mold Steel Tube (300HB/30HRC) for Thick Sections Product Information -:- For detailed product information, please contact sales. -: InduSteel Tube CLC 1.2738 Prehardened Mold Steel Tube (300HB/30HRC) for Thick Sections Synonyms -:- For detailed product information, please contact sales. -:

Industeel CLC 1.2738 Prehardened Mold Steel (300HB/30HRC) for Thick Sections Product Information -:- For detailed product information, please contact sales. -: # **Industeel CLC 1.2738 Prehardened Mold Steel (300 HB / 30 HRC) for Thick Sections** ## **Product Overview** Industeel CLC 1.2738 is a premium-grade, nickel-chromium-molybdenum alloyed mold steel specifically engineered and heat-treated for applications requiring **exceptional through-hardness uniformity in thick cross-sections**. Supplied in a prehardened and tempered condition at approximately 300 HB (30 HRC), this grade offers outstanding hardenability that ensures minimal hardness drop from surface to core, even in very large block sizes. It combines high core strength with good toughness and machinability, making it the material of choice for heavy-duty plastic molds and large forming tools where dimensional stability under load is paramount. ## **Key Features & Benefits** * **Superior Through-Hardenability:** The core advantage of CLC 1.2738 is its excellent hardenability, guaranteed by a carefully balanced high-nickel alloy design. This ensures a uniform hardness profile (typically ≤ 30 HB points variation) throughout the entire thickness of massive components, preventing soft cores that can lead to indentation or failure. * **Optimized for Thick Sections:** Specifically processed to deliver guaranteed mechanical properties in **large dimensions** (e.g., blocks exceeding 1000mm thickness), where standard prehardened steels would exhibit significant core softening. * **High Core Strength & Toughness:** The nickel-alloyed microstructure provides an excellent combination of tensile strength and impact toughness in the prehardened state, essential for withstanding high clamping forces and intermittent loads in large molds. * **Good Machinability & Polishability:** Despite its high hardenability, it maintains good machinability in the 300 HB condition and can be polished to high surface finishes (SPI-SPE A2/A3), suitable for visible plastic parts. * **Minimized Distortion Risk:** Supplied ready-to-machine, it eliminates the risks of distortion, cracking, and size changes associated with the quenching of large, complex parts in a workshop heat treatment. ## **Typical Applications** Industeel CLC 1.2738 is the preferred material for large-scale, high-performance tooling: * **Very Large Plastic Injection Molds:** For automotive body panels, bumpers, dashboards, appliance housings, and pallets. * **Thick-Walled Mold Bases & Support Plates:** Where consistent hardness and rigidity across the entire cross-section are critical to prevent deflection. * **Compression & Transfer Molds:** For rubber and composite materials. * **Large Die Casting Dies:** For aluminum and magnesium, particularly for structural components. * **Forming Tools & Press Brake Dies:** For sheet metal forming. ## **International Standards & Designations** | Region/Standard | Standard Designation | Common Name / Equivalent | | :--- | :--- | :--- | | **EUR (EN)** | **1.2738** (42CrMoNiV7-6) | Proprietary "CLC" version with guaranteed through-hardening. | | **Germany (W-Nr.)** | **1.2738** | | | **USA (AISI/ASTM)** | **P20+X / P20+Ni** (Modified P20 with added Nickel) | Often called "P20 Plus" or directly by DIN 1.2738. | | **USA (UNS)** | **K21020** (Modified) | | | **Japan (JIS)** | **PX88** | Equivalent high-hardenability P20 type. | | **Sweden (SS)** | **718 HH** (Heavy Hardening) | Refers to high-hardenability variants of 718. | *Note: "CLC" is Industeel's proprietary brand, indicating controlled ladle chemistry and specialized heat treatment cycles to achieve the guaranteed through-hardening properties in thick sections.* ## **Chemical Composition (Typical %)** The high Nickel and Molybdenum content is key to its deep-hardening properties. | Element | Content (%) | Role | | :--- | :--- | :--- | | **Carbon (C)** | 0.40 - 0.45 | Provides base hardness and strength. | | **Silicon (Si)** | 0.20 - 0.40 | Deoxidizer, strengthens ferrite. | | **Manganese (Mn)** | 1.40 - 1.60 | Increases hardenability and strength. | | **Chromium (Cr)** | 1.80 - 2.00 | Improves hardenability, wear, and corrosion resistance. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Enhances hardenability, strength at high tempering temperatures, and toughness. | | **Nickel (Ni)** | **0.90 - 1.10** | **The key element for superior hardenability and core toughness.** | | **Sulfur (S)** | ≤ 0.005 | Very low for better polishability and weldability. | | **Phosphorus (P)** | ≤ 0.015 | Very low for improved toughness. | ## **Physical & Mechanical Properties** * **Delivery Hardness:** **290 - 330 HB** (approx. **30 - 34 HRC**). Typically targeted at **300 HB**. * **Through-Hardening Guarantee:** Hardness uniformity is guaranteed per specification, e.g., max. 30 HB difference between surface and core in qualified thick sections (e.g., > 500mm). * **Tensile Strength:** ~1000 - 1150 MPa * **Yield Strength (0.2% offset):** ~800 - 950 MPa * **Elongation at Break:** ~10 - 14% * **Reduction of Area:** ~35 - 45% * **Impact Toughness (Charpy V, longitudinal):** Typically **≥ 25 J** at room temperature, reflecting its good toughness. * **Thermal Conductivity:** ~35 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** ~12.3 x 10⁻⁶ /K (20-100°C) ## **Processing Guidelines** * **Machining:** Machine in the prehardened state. Use robust setups and sharp tools with positive geometries. Recommended cutting speeds are similar to other 300 HB prehardened steels. Its uniformity allows for predictable machining behavior throughout the part. * **Welding:** Preheating to **300-350°C** is **mandatory** due to the alloy content and prehardened condition. Use low-hydrogen electrodes (e.g., AWS A5.5 E10018-D3 or similar). Post-weld tempering at **500-550°C** is strongly recommended to relieve stresses, especially in critical applications. * **Stress Relieving:** For complex and heavily machined large blocks, intermediate stress relieving at **550-600°C** can be performed to ensure dimensional stability. * **Nitriding:** Excellent candidate for gas or plasma nitriding to significantly increase surface hardness (> 1000 HV) and wear resistance without affecting the core properties. ## **Summary** **Industeel CLC 1.2738** is the definitive solution for **large, thick-walled mold and die applications** where guaranteed through-hardness and core properties cannot be compromised. Its superior hardenability, derived from a optimized nickel-alloyed chemistry and specialized processing, ensures performance uniformity in massive sections that standard P20/1.2312 grades cannot reliably achieve. It delivers the strength, toughness, and stability required for the most demanding large-format tooling projects. -:- For detailed product information, please contact sales. -: Industeel CLC 1.2738 Prehardened Mold Steel (300HB/30HRC) for Thick Sections Specification Dimensions Size： Diameter 20-1000 mm Length <5244 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. -: Industeel CLC 1.2738 Prehardened Mold Steel (300HB/30HRC) for Thick Sections Properties -:- For detailed product information, please contact sales. -:

Applications of InduSteel Tube CLC 1.2738 Prehardened Mold Steel Tube (300HB/30HRC) for Thick Sections -:- For detailed product information, please contact sales. -: Chemical Identifiers InduSteel Tube CLC 1.2738 Prehardened Mold Steel Tube (300HB/30HRC) for Thick Sections -:- For detailed product information, please contact sales. -:

Packing of InduSteel Tube CLC 1.2738 Prehardened Mold Steel Tube (300HB/30HRC) for Thick Sections -:- 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 Tube 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 1715 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