ASTM A 607 Class 1 Formable, Hot Rolled Carbon Steel Seamless tube, Medium/High Strength Low Alloy (HSLA)

AK Steel Seamless tube ASTM A 607 Class 1 Formable, Grade 45K Hot Rolled Carbon Steel Seamless tube, Medium/High Strength Low Alloy (HSLA) Product Information -:- For detailed product information, please contact sales. -: AK Steel Seamless tube ASTM A 607 Class 1 Formable, Grade 45K Hot Rolled Carbon Steel Seamless tube, Medium/High Strength Low Alloy (HSLA) Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 607 Class 1 Formable, Grade 45K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AK Steel ASTM A607 Class 1 Formable, Grade 45K Hot-Rolled HSLA Steel** **AK Steel ASTM A607 Class 1, Grade 45K** is a premium **hot-rolled, high-strength low-alloy (HSLA) steel sheet and strip** engineered to deliver an excellent balance of **high strength (45 ksi minimum yield), superior formability, and good weldability**. As a "**Formable**" (Class 1) grade, it is specifically designed for applications requiring **complex bending, stamping, or roll-forming operations** that would typically challenge conventional higher-strength steels. The "**K**" designation indicates a **strength range determined by the producer** (typically 45-60 ksi yield), with Grade 45K targeting the lower end of this range for optimal fabricability. Its enhanced properties are achieved through **microalloying with elements like vanadium, niobium, or titanium** in a controlled, low-carbon base, making it a versatile choice for weight-saving designs in demanding manufacturing sectors. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A607/A607M** - Standard Specification for Steel, Sheet and Strip, High-Strength, Low-Alloy, Columbium or Vanadium, or Both, Hot-Rolled and Cold-Rolled. * **Class Distinction:** **Class 1 - Formable**. This class is defined by superior ductility and forming characteristics compared to Class 2 ("Structural") grades. * **Grade System:** **"K" Grades (Producer-Determined Strength)**. Grade 45K specifies a minimum yield strength of 45 ksi (310 MPa), but the exact range (e.g., 45-60 ksi) is established by the steel producer to optimize the formability-strength balance. * **Related Standards:** * **ASTM A1011/A1011M** - Specification for HSLAS (High-Strength Low-Alloy Steel) types. * **SAE J1392** - Hot Rolled HSLA and Carbon Steel Sheet and Strip. * **ASTM A370** - Standard Test Methods for Mechanical Testing. * **Key Feature:** The microalloyed, low-carbon chemistry combined with controlled rolling allows it to meet **both the strength requirement of an HSLA steel and the formability requirement of a Class 1 "Formable" grade**. --- ## **Chemical Composition (Weight %, max unless range is specified)** The chemistry is characterized by **very low carbon content** and precise additions of microalloying elements to achieve strength through grain refinement and precipitation hardening, rather than through high carbon. | Element | Composition (Typical for Class 1, Grade 45K) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | **0.10 - 0.15 max** | **Very low.** Maximizes weldability and base metal toughness; essential for Class 1 formability. | | **Manganese (Mn)** | 0.60 - 1.20 | Solid solution strengthener; contributes to hardenability. | | **Phosphorus (P)** | 0.04 max | Impurity, kept low. | | **Sulfur (S)** | **0.03 max** | Tightly controlled to enhance formability and reduce risk of cracking during severe forming. | | **Silicon (Si)** | 0.15 - 0.50 | Deoxidizer and solid solution strengthener. | | **Columbium (Cb/Nb)** | **0.005 - 0.10** | **Primary microalloy.** Provides potent grain refinement and precipitation strengthening (NbC, NbCN). | | **Vanadium (V)** | **0.01 - 0.10** | Complementary microalloy for additional precipitation strengthening (VC, VN). | | **Titanium (Ti)** | 0.005 - 0.05 (optional) | May be used for grain refinement and sulfide shape control. | | **Aluminum (Al)** | 0.06 max | Grain refining deoxidizer. | | **Carbon Equivalent (CE)** | **Typically ≤ 0.30** | **Exceptionally low**, enabling excellent weldability without preheat in most cases. | **Note:** The exact balance of Cb and V is proprietary to the steel producer and is optimized to achieve the specified 45 ksi minimum yield strength while maximizing formability for Class 1. --- ## **Typical Physical & Mechanical Properties (Hot-Rolled, Class 1, Grade 45K)** Properties reflect the "Formable" designation, with high elongation and good n-value (strain hardening exponent) for its strength level. | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 450 - 550 MPa (65,000 - 80,000 psi) | | **Yield Strength (min)** | **310 MPa (45,000 psi)** (Producer's range, e.g., 45-55 ksi) | | **Elongation in 2-in (50 mm) (min)** | **24% - 28%** (Significantly higher than Class 2/Structural grades at same strength) | | **Yield-to-Tensile Ratio (max)** | Typically ≤ 0.80 | Ensures good formability and energy absorption. | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Strain Hardening Exponent (n-value)** | Relatively high for an HSLA steel, indicating good stretch formability. | | **Formability** | **Excellent (for 45 ksi strength).** Suitable for **moderate to severe bending, roll-forming, and stamping**. Minimum bend radius can be as low as **1x material thickness** for 90° bends. | | **Weldability** | **Excellent.** Very low CE allows welding with all common processes (SMAW, GMAW, RW) with minimal or no preheat. | --- ## **Product Applications** This steel is ideal for complex, formed components where reducing weight (via higher strength) cannot compromise the ability to manufacture the part. **Primary Industries and Products:** 1. **Automotive & Transportation:** * **Structural body-in-white components** (reinforcements, brackets, crossmembers). * **Chassis parts, suspension components, and seat frames.** * **Heavy truck and trailer frame components** requiring forming. 2. **Construction & Agricultural Equipment:** * **Cabs, roll-over protective structures (ROPS), and complex-formed guards.** * **Housings, brackets, and linkage components** that are stamped or bent. * **Implement parts** requiring both strength and complex shapes. 3. **Material Handling & Storage:** * **Formed components for heavy-duty storage racks.** * **Complex brackets and supports** for conveyor systems. 4. **General Manufacturing:** * **Stamped and formed parts** for machinery and appliances where weight savings are needed. * **Custom fabrications** requiring a combination of high strength and severe forming. --- ## **Advantages and Critical Fabrication Considerations** * **Advantages:** * **Unmatched Formability-to-Strength Ratio:** Offers the forming ease of a milder steel at a 45 ksi strength level. * **Superior Weldability:** Extremely low carbon equivalent simplifies welding procedures and reduces costs. * **Weight Reduction Potential:** Enables down-gauging (using thinner material) while maintaining or increasing part strength. * **Good Toughness:** Microalloyed structure provides good impact properties. * **Critical Fabrication Considerations:** * **Material Certification:** Ensure the **mill certificate specifies "ASTM A607 Class 1, Grade 45K"** to guarantee the formability properties. Do not substitute with Class 2 (Structural) material. * **Forming Tool Design:** While formable, it has higher strength and springback than mild steel. Tooling and processes (blank holder pressure, bend allowances) must be adjusted accordingly. * **Welding:** Despite excellent weldability, **standard good practices still apply** (clean surfaces, proper fit-up). Matching or slightly under-matching filler metals are acceptable. * **Shearing and Punching:** Higher strength requires greater tonnage; tool wear may be accelerated compared to mild steel. * **Heat Treatment Consideration:** Avoid exposing formed parts to temperatures above **~800°F (425°C)** if the as-formed strength is critical, as this may alter the precipitation-hardened microstructure. **In summary, AK Steel ASTM A607 Class 1, Grade 45K is a technologically advanced HSLA steel that breaks the traditional trade-off between strength and formability. It is the material of choice for engineers and stampers designing complex, weight-efficient components that must be manufactured through demanding forming processes, providing a reliable and fabricator-friendly path to lightweighting in the transportation and heavy equipment industries.** -:- For detailed product information, please contact sales. -: AK Steel ASTM A 607 Class 1 Formable, Grade 45K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) Specification Dimensions Size： Diameter 20-1000 mm Length <4565 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 607 Class 1 Formable, Grade 45K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) Properties -:- For detailed product information, please contact sales. -:

Applications of AK Steel Seamless tube ASTM A 607 Class 1 Formable, Grade 45K Hot Rolled Carbon Steel Seamless tube, Medium/High Strength Low Alloy (HSLA) -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel Seamless tube ASTM A 607 Class 1 Formable, Grade 45K Hot Rolled Carbon Steel Seamless tube, Medium/High Strength Low Alloy (HSLA) -:- For detailed product information, please contact sales. -:

Packing of AK Steel Seamless tube ASTM A 607 Class 1 Formable, Grade 45K Hot Rolled Carbon Steel Seamless tube, Medium/High Strength Low Alloy (HSLA) -:- 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 1036 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