ASTM A 424 Type III, I-F Enamel Enameling Carbon Steel Rod/Bar

AK Steel Rod ASTM A 424 Type III, I-F Enamel Enameling Carbon Steel Rod Product Information -:- For detailed product information, please contact sales. -: AK Steel Rod ASTM A 424 Type III, I-F Enamel Enameling Carbon Steel Rod Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 424 Type III, I-F Enamel Enameling Carbon Steel Product Information -:- For detailed product information, please contact sales. -: **Product Name:** AK Steel ASTM A424 Type III, I-F Grade Enameling Steel --- ### **1. Overview** AK Steel's ASTM A424 Type III, based on Interstitial-Free (I-F) steelmaking technology, represents the premium tier of enameling steels engineered for exceptional formability and enamelability. This grade is specifically designed for the most demanding **two-coat cover coat enameling** processes, where severe deep drawing is required before porcelain application. The I-F chemistry virtually eliminates interstitial atoms (carbon and nitrogen), providing outstanding ductility and non-aging characteristics, which are critical for preventing defects like fishscaling after forming and firing. ### **2. International Standards** This product is manufactured to meet or exceed the requirements of the following primary standard: * **ASTM A424 / A424M:** Standard Specification for Steel Sheet for Porcelain Enameling. * This product specifically conforms to **Type III**, which is designated for steels requiring exceptional formability and resistance to fishscaling in two-coat systems. ### **3. Chemical Composition (Typical, Key Controlled Elements)** The hallmark of I-F steel is the ultra-low level of interstitial elements, stabilized by strong carbide/nitride formers. | Element | Content (Typical Weight %) | Purpose in Enameling & Forming | | :--- | :--- | :--- | | Carbon (C) | 0.005% max (Ultra-Low) | **Critical.** Minimized to eliminate strain aging and prevent carbon-related enamel defects (boiling, black specking). | | Nitrogen (N) | 0.004% max (Ultra-Low) | **Critical.** Minimized to eliminate strain aging, ensuring consistent ductility and preventing fishscaling. | | Titanium (Ti) | 0.05 - 0.15% | **Critical Stabilizer.** Added to tie up any residual carbon and nitrogen as stable Ti(C,N), rendering them inert. This is the core of the I-F (Interstitial-Free) mechanism. | | Niobium (Nb) | May be used alone or with Ti | Alternative/complementary stabilizer to Ti. Also forms stable carbides/nitrides and refines grain structure. | | Manganese (Mn) | 0.25% max | Kept low to maintain excellent formability and surface quality. | | Phosphorus (P) | 0.020% max | Kept very low for good weldability and enamel adherence. | | Sulfur (S) | 0.025% max | Controlled for steel cleanliness. | | **Note:** | This is a fully stabilized, ultra-low interstitial (ULI) steel. The combined (Ti+Nb) to (C+N) ratio is carefully controlled. | | ### **4. Physical & Mechanical Properties (As-Supplied, typically in Enameling Quality "EQ" Temper)** Properties are optimized for maximum drawability. | Property | Value / Description | Condition / Note | | :--- | :--- | :--- | | **Yield Strength** | 20 - 30 ksi (140 - 205 MPa) | Very low yield point, ideal for deep drawing. | | **Tensile Strength** | 35 - 45 ksi (240 - 310 MPa) | | | **Elongation (min)** | 40% - 50% (in 2") | **Exceptional ductility.** Enables the most severe deep-drawing operations. | | **Strain-Hardening Exponent (n-value)** | ≥ 0.22 | High, indicating excellent uniform elongation and resistance to thinning during stretching. | | **Plastic Strain Ratio (r-value)** | ≥ 1.8 | High, indicating excellent deep-drawing ability and resistance to earring. | | **Key Enameling Property** | **Fishscale Resistance:** Excellent. The elimination of interstitial elements makes it inherently immune to strain-age embrittlement, the primary cause of fishscaling. | Ideally suited for parts that undergo severe deformation before enameling. | | **Surface Finish** | **Extra Smooth (XS)** or specific enamel-grade finish. Critical for a flawless final porcelain appearance. | | ### **5. Key Features & Advantages (I-F Enameling Steel)** * **Unmatched Formability:** Offers the highest level of deep drawability and stretchability among enameling steels. Capable of producing complex, deeply drawn parts (e.g., kitchen sinks, bathtubs) without cracking or tearing. * **Non-Aging & Consistent Properties:** The I-F stabilization locks in ductility. The steel does not age-harden at room temperature, ensuring consistent forming behavior over time. * **Superior Fishscale Resistance:** The complete stabilization of carbon and nitrogen provides inherent and guaranteed protection against fishscaling, even after severe forming. * **Optimized for Two-Coat Systems:** Designed as the ideal substrate for high-quality ground-coat/base-coat + cover-coat enameling processes, where formability and defect resistance are paramount. * **Excellent Surface Quality:** Produced to stringent surface standards necessary for high-gloss, decorative porcelain finishes. ### **6. Product Applications** This premium-grade steel is used for the most form-intensive and high-value enameled products. * **Deep-Drawn Appliances:** Bathroom sinks (lavatories), kitchen sinks, bathtubs, shower bases. * **Major Appliances:** Complexly formed oven cavities, dishwasher tubs, and refrigerator liners where severe draws are required. * **Architectural Panels:** Formed cladding elements and signage requiring both deep draws and a durable enamel finish. * **High-End Cookware & Sanitaryware.** ### **7. Fabrication & Processing Notes** * **Forming:** Can be subjected to extreme deep-drawing and stretching operations. Due to its non-aging nature, parts can be stored between forming and enameling without loss of properties. * **Enameling Process:** **Exclusively recommended for two-coat systems.** A ground coat (which contains adherence-promoting oxides like CoO and NiO) must be applied first to ensure proper bond, followed by the decorative cover coat. * **Cleaning & Pretreatment:** Standard alkaline cleaning and acid pickling (often with a nickel flash) are essential before applying the ground coat. * **Welding:** Resistance spot welding is common. The I-F composition provides good weldability, but parameters may need optimization for the ultra-low carbon content. --- **Disclaimer:** The information provided is for reference purposes. For critical applications, always consult the official Technical Data Sheets (TDS) from AK Steel (now part of **Cleveland-Cliffs Inc.**) and the relevant ASTM standards for the most current and precise specifications, processing guidelines, and performance guarantees. The successful application of this steel depends on a controlled enameling system (pretreatment, ground coat, firing cycle). -:- For detailed product information, please contact sales. -: AK Steel ASTM A 424 Type III, I-F Enamel Enameling Carbon Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4579 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. -: AK Steel ASTM A 424 Type III, I-F Enamel Enameling Carbon Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AK Steel Rod ASTM A 424 Type III, I-F Enamel Enameling Carbon Steel Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel Rod ASTM A 424 Type III, I-F Enamel Enameling Carbon Steel Rod -:- For detailed product information, please contact sales. -:

Packing of AK Steel Rod ASTM A 424 Type III, I-F Enamel Enameling Carbon Steel Rod -:- 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 Rod 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 1050 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