ASTM A 907 Steel Seamless tube, Hot Rolled Carbon Steel Seamless tube

AK Steel Seamless tube ASTM A 907, Grade 40 Hot Rolled Carbon Steel Seamless tube, Structural Quality (SQ) Product Information -:- For detailed product information, please contact sales. -: AK Steel Seamless tube ASTM A 907, Grade 40 Hot Rolled Carbon Steel Seamless tube, Structural Quality (SQ) Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 907, Grade 40 Hot Rolled Carbon Steel, Structural Quality (SQ) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AK Steel ASTM A907 Grade 40 Hot Rolled Carbon Steel** **AK Steel ASTM A907 Grade 40 (SQ)** is a **higher-strength, hot-rolled carbon steel sheet and strip** produced in **heavy thickness coils** for structural applications requiring **40 ksi (275 MPa) minimum yield strength**. This grade offers enhanced load-bearing capacity compared to lower-strength grades while maintaining **good fabricability and weldability**. As a coil-processed material under the A907 specification, it provides **consistent mechanical properties and dimensional uniformity** ideal for high-volume manufacturing of structural components that benefit from the 40 ksi strength level. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A907/A907M** - Standard Specification for Steel, Sheet and Strip, Heavy Thickness Coils, Hot-Rolled, Carbon, Commercial, Drawing, Structural, and High-Strength Low-Alloy, Grades 30[205] Through 70[480]. * **Product Form:** **Heavy thickness coils** - Supplied in coil form for processing into cut lengths or formed products. * **Quality Designation:** **Structural Quality (SQ)** - Meets standard requirements for structural fabrication. * **Related Standards:** * **ASTM A568/A568M** - General Requirements for Steel Sheet. * **ASTM A1011/A1011M** - Specification for Hot-Rolled Structural Steel. * **Strength Position:** Represents a **mid-range strength option** within the standard carbon steel grades, balancing increased capacity with maintainable fabricability. --- ## **Chemical Composition (Weight %, max)** The chemistry is controlled to achieve the 40 ksi yield strength while maintaining adequate weldability and formability. | Element | Composition (%) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.25 max | Primary strengthener; typically at higher end of range for Grade 40. | | **Manganese (Mn)** | 0.90 max | Enhances strength and hardenability; critical for 40 ksi target. | | **Phosphorus (P)** | 0.04 max | Impurity, kept low for formability. | | **Sulfur (S)** | 0.05 max | Impurity, controlled for weldability. | | **Silicon (Si)** | 0.30 max | Deoxidizer and solid solution strengthener. | | **Carbon Equivalent (CE)** | Typically 0.38-0.42 | Higher than lower grades; requires attention during welding. | --- ## **Typical Physical & Mechanical Properties** | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 425 - 585 MPa (62,000 - 85,000 psi) | | **Yield Strength (min)** | **275 MPa (40,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | **21%** | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Density** | ~7.85 g/cm³ | | **Formability** | **Moderate to Good.** Suitable for bending and moderate forming. Minimum bend radius typically **1-1.5 × thickness**. | | **Weldability** | **Good with proper procedures.** May require preheat for thicker sections (>1/4 inch/6 mm) or highly restrained joints. | | **Surface Finish** | Standard hot-rolled; pickled and oiled available for improved surface. | --- ## **Product Applications** **Medium-Strength Structural Components:** - **Primary framing members** in industrial buildings (purlins, girts) - **Heavy-duty supports and brackets** for equipment - **Trailer main rails and structural members** **Transportation Equipment:** - **Truck chassis components** and frame reinforcements - **Agricultural equipment frames** and implement parts - **Bus and RV structural members** **Industrial Fabrication:** - **Machine bases and support structures** - **Heavy-duty shelving and storage systems** - **Platforms, walkways, and access structures** **Construction Products:** - **Heavy formwork and shoring components** - **Temporary bridge and structure members** - **Sign and signal support structures** --- ## **Advantages and Fabrication Considerations** *Advantages:* - **Enhanced Strength:** 40 ksi yield provides 11-33% increase over lower grades (33/36 ksi) - **Material Efficiency:** Allows lighter designs or higher load capacity - **Good Fabricability:** Maintains reasonable formability and weldability - **Cost-Effective:** Economical alternative to microalloyed steels for many applications *Fabrication Considerations:* 1. **Welding Requirements:** Due to higher carbon equivalent: - **Preheat recommended:** 200-250°F (95-120°C) for thicknesses >1/4 inch (6 mm) - **Low-hydrogen practices:** Use E7018 electrodes or equivalent - **Control heat input:** Avoid excessive heat to prevent HAZ brittleness 2. **Forming Limitations:** - Increased springback compared to lower-strength grades - May require over-bending to achieve desired angles - Not recommended for severe forming or deep drawing 3. **Surface Preparation:** - Mill scale must be thoroughly removed for optimal coating adhesion - Pickled and oiled condition recommended for painting applications 4. **Alternative Considerations:** - For better weldability/formability at similar strength, consider ASTM A1011 HSLAS Grade 45 - For higher strength needs, evaluate ASTM A1011 HSLAS Grade 50-80 **In summary, AK Steel ASTM A907 Grade 40 provides a practical 40 ksi minimum yield strength solution for structural applications requiring enhanced load capacity. While offering good strength-to-cost ratio, it requires more careful fabrication practices than lower-strength carbon steels, particularly in welding and forming operations. Proper application engineering and fabrication procedures are essential to leverage its strength advantages effectively.** -:- For detailed product information, please contact sales. -: AK Steel ASTM A 907, Grade 40 Hot Rolled Carbon Steel, Structural Quality (SQ) Specification Dimensions Size： Diameter 20-1000 mm Length <4564 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 907, Grade 40 Hot Rolled Carbon Steel, Structural Quality (SQ) Properties -:- For detailed product information, please contact sales. -:

Applications of AK Steel Seamless tube ASTM A 907, Grade 40 Hot Rolled Carbon Steel Seamless tube, Structural Quality (SQ) -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel Seamless tube ASTM A 907, Grade 40 Hot Rolled Carbon Steel Seamless tube, Structural Quality (SQ) -:- For detailed product information, please contact sales. -:

Packing of AK Steel Seamless tube ASTM A 907, Grade 40 Hot Rolled Carbon Steel Seamless tube, Structural Quality (SQ) -:- 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 1035 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