ASTM A 424 Type II, VIT-PLUS® DS Enameling Carbon Steel Seamless tube

AK Steel Seamless tube ASTM A 424 Type II, VIT-PLUS® DS Enameling Carbon Steel Seamless tube Product Information -:- For detailed product information, please contact sales. -: AK Steel Seamless tube ASTM A 424 Type II, VIT-PLUS® DS Enameling Carbon Steel Seamless tube Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 424 Type II, VIT-PLUS® DS Enameling Carbon Steel Product Information -:- For detailed product information, please contact sales. -: **Product Name:** AK Steel ASTM A424 Type II, VIT-PLUS® DS Enameling Carbon Steel --- ### **1. Overview** AK Steel's VIT-PLUS® DS is a specialized, fully stabilized enameling steel conforming to **ASTM A424 Type II**. Designed for single-coat **Direct-On (DS)** porcelain enameling processes, this product offers a superior balance of formability, surface quality, and enamel defect resistance. The "VIT-PLUS" designation signifies its enhanced performance over standard enameling steels, particularly in its ability to withstand the demanding direct application of a single porcelain layer without common flaws such as fishscaling or reboil. It is engineered for high-volume production of durable, high-gloss enameled components where cost efficiency and performance are critical. --- ### **2. International Standards** This product is manufactured to meet or exceed the specifications of the following standards: - **Primary Standard:** **ASTM A424 / A424M** – Standard Specification for Steel Sheet for Porcelain Enameling. - Compliant with **Type II**: Steel intended for direct-on enameling, requiring controlled chemistry for fishscale resistance. - **Industry Reference:** Often aligns with typical automotive and appliance material specifications for porcelain enameling substrates. --- ### **3. Chemical Composition (Typical)** The chemistry is tightly controlled to ensure optimal enamel adherence and resistance to defects during the high-temperature firing process. | Element | Content (Weight %, Max or Typical) | Role in Enameling Performance | | :------------- | :-------------------------------------------------------------- | :-------------------------------------------------------------- | | **Carbon (C)** | 0.005% max (Ultra-Low) | **Critical.** Minimizes gas evolution (CO/CO₂) during firing, preventing blisters, boils, and black specking. | | **Manganese (Mn)** | 0.35% max | Maintains steel strength and solidity; kept low to aid formability and enamel adherence. | | **Phosphorus (P)** | 0.020% max | Kept very low to promote good weldability and enamel bond. | | **Sulfur (S)** | 0.025% max | Controlled for steel cleanliness and surface quality. | | **Titanium (Ti)** | 0.15 - 0.25% (Typical) | **Key Stabilizer.** Forms stable carbides and nitrides, effectively "locking up" residual interstitials to prevent fishscaling and strain aging. | | **Nitrogen (N)** | Controlled to very low levels | Minimized and stabilized to prevent enamel defects. | | **Aluminum (Al)** | May be present as a deoxidizer | Contributes to a clean steel microstructure. | **Key Characteristic:** This is a **Titanium-Stabilized, Ultra-Low Carbon (ULC)** steel. The Ti to C/N ratio is optimized for direct-on enameling. --- ### **4. Physical & Mechanical Properties (As-Supplied, Temper Rolled)** | Property | Typical Value / Range | Notes | | :-------------------------- | :------------------------------------------------- | :-------------------------------------------------------------------- | | **Yield Strength** | 25 - 35 ksi (170 - 240 MPa) | Provides a good balance of strength and formability. | | **Tensile Strength** | 40 - 52 ksi (275 - 360 MPa) | | | **Elongation (in 2")** | 30% - 40% (minimum typically ≥ 28%) | Good ductility for moderate forming and drawing operations. | | **Hardness (Rockwell B)** | 45 - 65 HRB | | | **Surface Finish** | **Enameling Quality (EQ)** – Extra Smooth (XS) | A pristine, defect-free surface is essential for direct-on enamel application. | | **Primary Enameling Property** | **Excellent Fishscale Resistance** | Certified to pass standard fishscale tests due to Ti stabilization. | | **Suitability** | Optimized for **Direct-On Single-Coat** Enameling | Eliminates the need for a ground coat, reducing process steps and cost. | --- ### **5. Key Features & Advantages** - **Direct-On Enameling Efficiency:** Engineered specifically for single-coat application, reducing material consumption, furnace firing time, and overall production costs compared to two-coat systems. - **Superior Fishscale Resistance:** The titanium-stabilized, ultra-low carbon chemistry provides inherent and reliable protection against fishscaling, a primary failure mode in enameling. - **Excellent Surface Quality:** Produced with a superior surface finish (XS) essential for achieving a high-gloss, defect-free porcelain appearance directly on the steel. - **Good Formability & Consistency:** Offers reliable ductility for forming into typical appliance and architectural shapes, with consistent batch-to-batch performance. - **Weldability:** Suitable for standard resistance spot welding, facilitating assembly in appliance manufacturing. --- ### **6. Product Applications** VIT-PLUS® DS is the preferred substrate for a wide range of high-quality, single-coat porcelain enameled products. - **Major Appliances:** Oven and range cavities, broiler drawers, cooktop panels, dishwasher tub interiors, and microwave oven liners. - **Water Heaters & Heat Exchangers:** Interior tanks and components requiring a durable, corrosion-resistant glass lining. - **Architectural & Building Products:** Interior wall panels, decorative panels, and signage. - **Commercial/Residential:** Cookware, barbecue grills, fireplace surrounds, and sanitaryware. --- ### **7. Fabrication & Processing Notes** - **Forming:** Should be formed in the as-supplied temper-rolled condition. The steel is suitable for moderate drawing and bending. - **Cleaning & Pretreatment:** **Critical Step.** Must undergo thorough alkaline cleaning, rinsing, acid pickling (sulfuric or hydrochloric), and a nickel flash pretreatment to ensure proper enamel adherence. - **Firing:** Typical direct-on enamel firing is performed at temperatures between **1450°F - 1550°F (790°C - 845°C)**. The steel's properties remain stable in this range. - **Welding:** Resistance spot welding is standard. For arc welding, specific procedures are required, and coating the weld zone with enamel may be challenging. --- **Disclaimer:** *VIT-PLUS® is a registered trademark of Cleveland-Cliffs Inc. (formerly AK Steel).* The information provided is for general reference. For production use, always consult the latest official **Technical Data Sheet (TDS)** from Cleveland-Cliffs Inc. and the complete **ASTM A424** standard. Successful enameling depends on the entire system—steel, pretreatment, enamel slip, and firing cycle—all of which must be precisely controlled. -:- For detailed product information, please contact sales. -: AK Steel ASTM A 424 Type II, VIT-PLUS® DS Enameling Carbon Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4580 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 II, VIT-PLUS® DS Enameling Carbon Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AK Steel Seamless tube ASTM A 424 Type II, VIT-PLUS® DS Enameling Carbon Steel Seamless tube -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel Seamless tube ASTM A 424 Type II, VIT-PLUS® DS Enameling Carbon Steel Seamless tube -:- For detailed product information, please contact sales. -:

Packing of AK Steel Seamless tube ASTM A 424 Type II, VIT-PLUS® DS Enameling Carbon Steel Seamless tube -:- 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 Seamless 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 1051 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