AK Steel ASTM A 607 Class 2 Formable, Grade 50K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA)

AK Steel ASTM A 607 Class 2 Formable, Grade 50K 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 50K 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 50K 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 50K Hot-Rolled HSLA Steel** **AK Steel ASTM A607 Class 2, Grade 50K** is a **hot-rolled, high-strength low-alloy (HSLA) steel sheet and strip** engineered to provide **50 ksi (345 MPa) minimum yield strength** with a focus on **structural performance and weldability** while maintaining adequate formability for general manufacturing. As part of the "**Structural**" (Class 2) designation, this grade prioritizes **load-bearing capacity and reliability** over maximum formability, making it ideal for applications where strength is the primary design consideration. The "**K**" designation indicates a **producer-determined strength range** (typically 50-65 ksi yield), allowing for optimized mechanical properties. Achieving its properties through **controlled microalloying with vanadium or niobium** in a low-carbon base, this material offers an excellent balance of strength, weldability, and moderate formability for structural applications. --- ## **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 emphasizes **structural performance, weldability, and cost-effectiveness** over extreme formability. * **Grade System:** **"K" Grades (Producer-Determined Strength)**. Grade 50K specifies a minimum yield strength of 50 ksi (345 MPa), with the exact range established by the producer to balance strength and other properties. * **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 **50 ksi yield strength with good structural characteristics and moderate fabricability**, representing a practical choice for many structural applications. --- ## **Chemical Composition (Weight %, typical)** The chemistry is designed to achieve 50 ksi yield strength while maintaining good weldability and adequate formability for structural applications. | Element | Composition (Typical for Class 2, Grade 50K) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.15 - 0.20 | Provides fundamental strength while maintaining weldability. | | **Manganese (Mn)** | 1.00 - 1.40 | Enhances strength and hardenability; critical for achieving 50 ksi yield. | | **Phosphorus (P)** | 0.035 max | Impurity, kept low for good ductility. | | **Sulfur (S)** | 0.04 max | Impurity, controlled for weldability. | | **Silicon (Si)** | 0.15 - 0.50 | Deoxidizer and solid solution strengthener. | | **Columbium (Cb/Nb)** | 0.005 - 0.05 | Microalloy for grain refinement and precipitation strengthening. | | **Vanadium (V)** | 0.02 - 0.10 | Alternative/complementary microalloy for precipitation strengthening. | | **Carbon Equivalent (CE)** | Typically 0.38 - 0.45 | Moderate; requires proper welding procedures. | **Note:** The steel may contain either columbium or vanadium as the primary microalloying element, depending on the producer's specific formulation and processing approach. --- ## **Typical Physical & Mechanical Properties (Hot-Rolled, Class 2, Grade 50K)** | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 480 - 620 MPa (70,000 - 90,000 psi) | | **Yield Strength (min)** | **345 MPa (50,000 ksi)** | | **Elongation in 2-in (50 mm) (min)** | **18% - 20%** | | **Yield-to-Tensile Ratio** | Typically 0.72 - 0.80 | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Density** | ~7.85 g/cm³ (0.284 lb/in³) | | **Formability** | **Moderate.** Suitable for **simple to moderate bending and forming operations.** Minimum bend radius typically **1.5-2.5× material thickness** depending on the direction relative to rolling. | | **Weldability** | **Good with proper procedures.** Preheat of 200-300°F (95-150°C) recommended for thicknesses >1/4 inch (6 mm) or highly restrained joints. Low-hydrogen practices are advised. | | **Surface Quality** | Standard hot-rolled surface finish; pickled and oiled available for improved surface condition. | --- ## **Product Applications** AK Steel ASTM A607 Class 2, Grade 50K is suitable for structural components where 50 ksi yield strength and good weldability are required, with moderate forming needs. **Primary Industries and Products:** 1. **Structural Framing & Construction:** * **Building frames, purlins, and girts** in industrial and commercial structures. * **Structural supports, brackets, and framing members.** * **Industrial building components** requiring 50 ksi strength. 2. **Transportation Equipment:** * **Truck and trailer structural members** (frame rails, crossmembers). * **Agricultural equipment frames** and implement supports. * **Heavy vehicle components** requiring 50 ksi yield strength. 3. **Material Handling & Storage:** * **Heavy-duty storage rack components.** * **Industrial platforms, walkways, and access structures.** * **Material handling equipment frames** and supports. 4. **General Manufacturing & Fabrication:** * **Machine bases, supports, and guards.** * **Structural fabrications** requiring 50 ksi strength. * **Mounting brackets and hardware** for heavy equipment. --- ## **Advantages and Fabrication Considerations** * **Advantages:** * **Reliable 50 ksi Strength:** Provides consistent 50 ksi minimum yield strength for structural applications. * **Good Weldability:** Reasonable carbon equivalent allows for standard welding practices with proper procedures. * **Cost-Effective:** Offers 50 ksi strength at a competitive price point compared to some alternative materials. * **Adequate Formability:** Suitable for most standard manufacturing forming operations. * **Fabrication Considerations:** * **Welding Requirements:** Due to moderate carbon equivalent, **preheat of 200-300°F (95-150°C) is recommended** for thicknesses >1/4 inch (6 mm) or highly restrained joints. **Low-hydrogen welding practices** should be used. * **Forming Limitations:** Not suitable for severe forming operations. Springback is more significant than with lower-strength steels. * **Surface Preparation:** Mill scale should be removed for optimal coating adhesion; pickled and oiled condition is recommended for painting applications. * **Alternative Materials:** For applications requiring **better formability** at similar strength, consider **ASTM A607 Class 1, Grade 50K**. For applications requiring **higher strength**, consider higher K-grades. * **Quality Verification:** Request material test reports to confirm mechanical properties meet the 50 ksi minimum yield requirement. **In summary, AK Steel ASTM A607 Class 2, Grade 50K provides a practical and reliable 50 ksi yield strength solution for structural applications where strength and weldability are prioritized over extreme formability. It represents a balanced choice for manufacturers needing 50 ksi strength with adequate fabricability for standard manufacturing processes, offering good performance at a competitive cost for many structural applications.** -:- For detailed product information, please contact sales. -: AK Steel ASTM A 607 Class 2 Formable, Grade 50K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) Specification Dimensions Size： Diameter 20-1000 mm Length <4570 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 50K 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 50K 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 50K 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 50K 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 1041 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