AK Steel ASTM A 607 Class 2 Formable, Grade 45K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA)

AK Steel ASTM A 607 Class 2 Formable, Grade 45K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) Product Information -:- For detailed product information, please contact sales. -: AK Steel ASTM A 607 Class 2 Formable, Grade 45K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 607 Class 2 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 2, Grade 45K Hot-Rolled HSLA Steel** **AK Steel ASTM A607 Class 2, Grade 45K** is a **hot-rolled, high-strength low-alloy (HSLA) steel sheet and strip** designed to provide **45 ksi (310 MPa) minimum yield strength** with an optimal balance of **structural performance and fabricability**. As a "**Structural**" (Class 2) grade, it is engineered for applications requiring **good strength and moderate formability**, where primary emphasis is on **load-bearing capacity and structural integrity** rather than complex forming operations. The "**K**" designation indicates a **producer-determined strength range** (typically 45-60 ksi yield), providing flexibility in mechanical property optimization. This grade achieves its enhanced properties through **controlled microalloying with vanadium or niobium** in a low-carbon base, offering a cost-effective solution for structural components that require welding, moderate bending, and reliable performance. --- ## **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 2 - Structural**. This classification is designed for applications where **structural performance and weldability** are prioritized over maximum formability. * **Grade System:** **"K" Grades (Producer-Determined Strength)**. Grade 45K specifies a minimum yield strength of 45 ksi (310 MPa), with the exact range established by the producer. * **Related Standards:** * **ASTM A1011/A1011M** - Specification for HSLAS (High-Strength Low-Alloy Steel). * **SAE J1392** - Hot Rolled HSLA and Carbon Steel Sheet and Strip. * **ASTM A370** - Standard Test Methods and Definitions for Mechanical Testing. * **Key Feature:** Provides **good strength with adequate formability** for structural applications, offering a practical balance between performance and manufacturability. --- ## **Chemical Composition (Weight %, max)** The chemistry is designed to achieve 45 ksi yield strength with good weldability and moderate formability. | Element | Composition (Typical for Class 2, Grade 45K) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.15 - 0.22 max | Provides base strength while maintaining reasonable weldability. | | **Manganese (Mn)** | 0.90 - 1.40 | Enhances strength and hardenability. | | **Phosphorus (P)** | 0.04 max | Impurity, controlled. | | **Sulfur (S)** | 0.05 max | Impurity, controlled for weldability. | | **Silicon (Si)** | 0.15 - 0.50 | Deoxidizer and solid solution strengthener. | | **Columbium (Cb/Nb)** | 0.005 - 0.05 | Provides grain refinement and precipitation strengthening. | | **Vanadium (V)** | 0.01 - 0.08 | Alternative microalloy for precipitation strengthening. | | **Copper (Cu)** | 0.20 min (when specified) | Optional for corrosion resistance. | | **Carbon Equivalent (CE)** | Typically 0.35 - 0.42 | Moderate; requires attention to welding procedures. | --- ## **Typical Physical & Mechanical Properties (Hot-Rolled, Class 2, Grade 45K)** | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 450 - 600 MPa (65,000 - 87,000 psi) | | **Yield Strength (min)** | **310 MPa (45,000 ksi)** | | **Elongation in 2-in (50 mm) (min)** | **19% - 22%** | | **Yield-to-Tensile Ratio** | Typically 0.69 - 0.78 | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Formability** | **Moderate.** Suitable for **simple to moderate bending and forming operations.** Minimum bend radius typically **1.5-2.0× material thickness.** | | **Weldability** | **Good with proper procedures.** May require preheat for thicker sections or highly restrained joints. Low-hydrogen practices recommended. | | **Surface Quality** | Standard hot-rolled surface finish. | --- ## **Product Applications** This material is suitable for structural components where strength and weldability are primary considerations, with moderate forming requirements. **Primary Industries and Products:** 1. **Structural Framing & Construction:** * **Building frames, purlins, and girts** * **Structural supports and brackets** * **Industrial building components** 2. **Transportation Equipment:** * **Truck and trailer structural members** * **Agricultural equipment frames** * **Railcar components** 3. **Material Handling:** * **Storage rack components** * **Industrial platforms and walkways** * **Material handling equipment frames** 4. **General Manufacturing:** * **Machine bases and supports** * **Heavy-duty brackets and mounts** * **Structural fabrications** --- ## **Advantages and Fabrication Considerations** * **Advantages:** * **Cost-Effective Strength:** Provides 45 ksi yield at competitive cost * **Good Weldability:** Reasonable carbon equivalent allows standard welding practices * **Structural Performance:** Designed for load-bearing applications * **Adequate Formability:** Suitable for most structural forming operations * **Fabrication Considerations:** * **Welding Requirements:** Preheat of 200-300°F (95-150°C) recommended for thicknesses >1/4 inch (6 mm) * **Forming Limitations:** Not suitable for severe forming operations * **Surface Preparation:** Mill scale removal recommended for optimal coating adhesion * **Alternative Selection:** For better formability, consider Class 1 grades; for higher strength, consider higher K-grades **In summary, AK Steel ASTM A607 Class 2, Grade 45K provides a practical structural steel solution offering 45 ksi minimum yield strength with adequate fabricability for most structural applications. It represents a balanced choice for components where structural performance takes precedence over extreme formability requirements.** -:- For detailed product information, please contact sales. -: AK Steel ASTM A 607 Class 2 Formable, Grade 45K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) Specification Dimensions Size： Diameter 20-1000 mm Length <4569 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 2 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 ASTM A 607 Class 2 Formable, Grade 45K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel ASTM A 607 Class 2 Formable, Grade 45K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) -:- For detailed product information, please contact sales. -:

Packing of AK Steel ASTM A 607 Class 2 Formable, Grade 45K Hot Rolled Carbon Steel, 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 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 1040 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