ASTM A 463 / SAE J1392 040 AHK, Grade 40 Aluminized Carbon Steel Seamless tube, Structural Steel Seamless tube (SS)

AK Steel Seamless tube ASTM A 463 / SAE J1392 040 AHK, Grade 40 Aluminized Carbon Steel Seamless tube, Structural Steel Seamless tube (SS) Product Information -:- For detailed product information, please contact sales. -: AK Steel Seamless tube ASTM A 463 / SAE J1392 040 AHK, Grade 40 Aluminized Carbon Steel Seamless tube, Structural Steel Seamless tube (SS) Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 463 / SAE J1392 040 AHK, Grade 40 Aluminized Carbon Steel, Structural Steel (SS) Product Information -:- For detailed product information, please contact sales. -: **Product Name:** ASTM A463 / SAE J1392 Type 2 Grade 40 Aluminized Carbon Steel, Structural Steel (SS) **Common Designation:** 040 AHK (Aluminized Hot-Rolled Carbon Steel, Commercial Quality, Grade 40) --- ### **1. Overview** AK Steel's ASTM A463 (SAE J1392) 040 AHK is a hot-rolled carbon structural steel sheet that has been continuously hot-dip coated with commercially pure aluminum on both sides. This process creates a tight metallic bond between the aluminum coating and the steel substrate, resulting in a unique combination of properties. The "Grade 40" denotes a minimum yield strength of 40 ksi (275 MPa). The product is designed for applications requiring enhanced corrosion resistance and heat reflectivity compared to standard galvanized steels, while maintaining good strength and formability. ### **2. International Standards** This product is manufactured to meet or exceed the requirements of the following standards: * **ASTM A463 / A463M:** Standard Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip Process. * **SAE J1392:** Specification for Aluminum-Coated Steel Sheet. * The specific grade aligns with **Type 2** (Aluminum-silicon coating, typically 5-11% silicon) or **Type 1** (Commercial Pure Aluminum coating), depending on the specific order, with Grade 40 mechanical properties. ### **3. Chemical Composition (Typical, Base Steel)** The composition of the underlying steel is balanced to provide formability, strength, and coating adherence. | Element | Content (Weight %, max unless specified) | | :--- | :--- | | Carbon (C) | 0.15% | | Manganese (Mn) | 0.60% | | Phosphorus (P) | 0.035% | | Sulfur (S) | 0.035% | | Silicon (Si) | 0.15% | | **Aluminum Coating** | **Commercially Pure Aluminum or Al-Si Alloy** | | **Coating Mass** | **Common Designations: A60 (0.60 oz/ft² total) or A100 (1.00 oz/ft² total)** | ### **4. Physical & Mechanical Properties** Properties are specified for the base steel after coating. | Property | Value | Condition / Note | | :--- | :--- | :--- | | **Yield Strength (min)** | 40 ksi (275 MPa) | As produced, typical | | **Tensile Strength** | 49 - 65 ksi (340 - 450 MPa) | As produced, typical | | **Elongation (min)** | 20% (in 2") | For thickness ≥ 0.028 in. (0.71 mm) | | **Density (Steel)** | 7.85 g/cm³ (0.284 lb/in³) | - | | **Coating Characteristics** | Excellent heat reflectivity (up to ~80%), good corrosion resistance, especially to atmospheric and high-temperature oxidation. Performs well in sulfurous atmospheres. | Coating is anodic to steel, providing sacrificial protection at cut edges. | ### **5. Key Features & Advantages** * **Superior Corrosion Resistance:** The aluminum coating forms a protective oxide layer, offering 3-5 times the life of galvanized steel in many industrial and rural atmospheres. Highly resistant to heat scale and oxidation. * **High-Temperature Performance:** Can withstand continuous exposure up to 900°F (480°C) without significant scaling, making it suitable for heat-containing applications. * **Heat Reflectivity:** The bright, silvery surface reflects up to 80% of radiant heat, improving energy efficiency in applications like oven liners and heat shields. * **Sacrificial Protection:** Like zinc, the aluminum coating provides galvanic (sacrificial) protection to exposed steel at cut edges and scratches. * **Combination of Strength & Formability:** The Grade 40 strength level provides good structural capability while remaining formable for fabrication. ### **6. Product Applications** This aluminized steel is widely used in applications demanding durability against heat and corrosion. * **Automotive Exhaust Systems:** Heat shields, muffler wrappers, catalytic converter covers, tailpipe assemblies. * **Industrial Heat Processing:** Oven liners, furnace components, heat exchanger cabinets, dryer panels. * **Agricultural Equipment:** Silo roofing, grain bin roofs, dryer housings, panels for corrosive farm environments. * **Building & Construction:** Roofing and siding for industrial buildings (where heat resistance is needed), downspouts in aggressive environments, chimney caps. * **Appliances:** Heat reflectors in residential and commercial heaters, fireplaces, and certain dryer components. ### **7. Fabrication Notes** * **Welding:** Can be welded using standard techniques (MIG, TIG, Resistance), but may require specific procedures due to the aluminum coating. The coating must be removed from the weld zone for best results with arc welding. * **Forming:** Good formability; however, the coating is harder than galvanized zinc and may exhibit some micro-cracking during severe deformation. This does not significantly impair corrosion protection. * **Painting/Adhesion:** The aluminum surface is not readily paintable without proper chemical pretreatment or mechanical abrasion to ensure adhesion. --- **Disclaimer:** The information provided is for reference purposes. For critical applications, always consult the official data sheets from AK Steel (now part of Cleveland-Cliffs) and the relevant ASTM/SAE standards for the most current and precise specifications, tolerances, and processing recommendations. -:- For detailed product information, please contact sales. -: AK Steel ASTM A 463 / SAE J1392 040 AHK, Grade 40 Aluminized Carbon Steel, Structural Steel (SS) Specification Dimensions Size： Diameter 20-1000 mm Length <4577 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 463 / SAE J1392 040 AHK, Grade 40 Aluminized Carbon Steel, Structural Steel (SS) Properties -:- For detailed product information, please contact sales. -:

Applications of AK Steel Seamless tube ASTM A 463 / SAE J1392 040 AHK, Grade 40 Aluminized Carbon Steel Seamless tube, Structural Steel Seamless tube (SS) -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel Seamless tube ASTM A 463 / SAE J1392 040 AHK, Grade 40 Aluminized Carbon Steel Seamless tube, Structural Steel Seamless tube (SS) -:- For detailed product information, please contact sales. -:

Packing of AK Steel Seamless tube ASTM A 463 / SAE J1392 040 AHK, Grade 40 Aluminized Carbon Steel Seamless tube, Structural Steel Seamless tube (SS) -:- 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 1048 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