AK Steel ASTM A 607 Class 1 Formable, Grade 50K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA)

AK Steel ASTM A 607 Class 1 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 1 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 1 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 1 Formable, Grade 50K Hot-Rolled HSLA Steel** **AK Steel ASTM A607 Class 1, Grade 50K** is an advanced **hot-rolled, high-strength low-alloy (HSLA) steel sheet and strip** engineered to deliver an exceptional balance of **50 ksi (345 MPa) minimum yield strength and superior formability**. As a member of the "**Formable**" (Class 1) family, this grade is specifically designed for applications requiring **complex stamping, deep drawing, or severe bending operations** that demand both high strength and excellent ductility. The "**K**" designation indicates a **producer-determined strength range** (typically 50-65 ksi yield), with Grade 50K optimized for the lower end of this range to maximize fabricability. Its enhanced mechanical properties are achieved through sophisticated **microalloying with vanadium, niobium, and/or titanium** in an ultra-low-carbon base, making it an ideal solution for lightweight structural components in automotive, transportation, and heavy equipment industries. --- ## **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 classification guarantees superior ductility and forming characteristics beyond standard structural grades. * **Grade System:** **"K" Grades (Producer-Determined Strength)**. Grade 50K specifies a minimum yield strength of 50 ksi (345 MPa), with the actual range (e.g., 50-60 ksi) established by the producer to optimize the formability-strength balance. * **Related Standards:** * **ASTM A1011/A1011M** - Specification for HSLAS (High-Strength Low-Alloy Steel). * **SAE J1392** - Hot Rolled HSLA and Carbon Steel Sheet and Strip. * **ISO 4952** - High yield strength steel sheets and strips. * **Key Feature:** Microalloyed chemistry enables **strength through precipitation hardening and grain refinement** rather than high carbon content, resulting in Class 1 formability at 50 ksi yield strength. --- ## **Chemical Composition (Weight %, typical)** The chemistry features ultra-low carbon content with precise microalloy additions for strength and enhanced formability. | Element | Composition (Typical for Class 1, Grade 50K) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | **0.08 - 0.12 max** | **Ultra-low.** Critical for maximizing weldability and formability while maintaining strength through microalloying. | | **Manganese (Mn)** | 0.80 - 1.40 | Provides solid solution strengthening and hardenability. | | **Phosphorus (P)** | 0.025 max | Tightly controlled impurity. | | **Sulfur (S)** | **0.008 - 0.015 max** | **Extremely low.** Essential for preventing cracking during severe forming operations. | | **Silicon (Si)** | 0.10 - 0.40 | Deoxidizer and solid solution strengthener. | | **Columbium (Cb/Nb)** | **0.02 - 0.08** | **Primary microalloy.** Provides grain refinement and precipitation strengthening through Nb(C,N) precipitates. | | **Vanadium (V)** | **0.04 - 0.10** | Complementary microalloy for additional precipitation strengthening via V(C,N). | | **Titanium (Ti)** | 0.005 - 0.03 (optional) | Used for grain refinement and sulfide shape control. | | **Aluminum (Al)** | 0.015 - 0.060 | Grain refining deoxidizer. | | **Carbon Equivalent (CE)** | **Typically ≤ 0.32** | **Exceptionally low,** enabling superior weldability without preheat requirements. | **Processing Note:** The specific combination and amounts of Cb, V, and Ti are proprietary to the steel producer and are optimized through controlled rolling and cooling to achieve the optimal microstructure for both strength and formability. --- ## **Typical Physical & Mechanical Properties (Hot-Rolled, Class 1, Grade 50K)** | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 480 - 620 MPa (70,000 - 90,000 psi) | | **Yield Strength (min)** | **345 MPa (50,000 psi)** (Producer's range: typically 50-60 ksi) | | **Elongation in 2-in (50 mm) (min)** | **22% - 26%** | | **Yield-to-Tensile Ratio** | Typically 0.70 - 0.80 | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Strain Hardening Exponent (n-value)** | 0.12 - 0.18 (relatively high for HSLA steel) | | **Plastic Strain Ratio (r-value)** | 0.9 - 1.2 (indicates good deep drawability) | | **Formability** | **Excellent for 50 ksi strength.** Suitable for **deep drawing, stretch forming, and complex stamping.** Minimum bend radius can be as low as **1x material thickness.** | | **Weldability** | **Excellent.** Can be welded using all common processes (SMAW, GMAW, GTAW, RW) with minimal precautions. | | **Surface Quality** | Superior surface finish suitable for exposed applications after painting. | --- ## **Product Applications** This material is specifically designed for complex formed components where high strength and weight reduction are critical, but manufacturability cannot be compromised. **Primary Industries and Products:** 1. **Automotive Structural Components:** * **Body-in-white reinforcements** (A-pillars, B-pillars, roof rails) * **Chassis frames and subframes** * **Seat structures and safety components** * **Suspension arms and brackets** 2. **Heavy Transportation Equipment:** * **Truck cab structures and roll-over protection systems** * **Trailer side rails and crossmembers** * **Agricultural equipment cabs and frames** * **Construction equipment operator compartments** 3. **Industrial Equipment:** * **Complex-formed machinery housings and guards** * **Material handling equipment components** * **Heavy-duty storage system components** 4. **Energy and Infrastructure:** * **Wind turbine components** * **Electrical transmission equipment** * **Construction equipment parts** --- ## **Advantages and Critical Fabrication Considerations** * **Advantages:** * **Superior Strength-Formability Balance:** Achieves 50 ksi yield strength while maintaining formability comparable to lower-strength steels. * **Exceptional Weldability:** Ultra-low carbon equivalent simplifies welding procedures and reduces fabrication costs. * **Weight Reduction Potential:** Enables significant down-gauging while maintaining or improving component strength. * **Improved Crash Energy Management:** Good combination of strength and ductility enhances energy absorption characteristics. * **Cost-Effective High Strength:** Provides premium mechanical properties at a competitive cost compared to alternative materials. * **Critical Fabrication Considerations:** * **Material Specification:** Ensure procurement specifies **"ASTM A607 Class 1, Grade 50K"** to guarantee both strength and formability properties. * **Tooling Design:** Account for higher springback and greater forming forces compared to mild steel. Progressive die design may require adjustments. * **Lubrication Requirements:** May require specialized lubricants for severe forming operations to prevent galling and surface defects. * **Heat Treatment Effects:** Avoid prolonged exposure above 400°C (750°F) to prevent over-aging and potential strength reduction. * **Surface Preparation:** For painting applications, standard phosphate or other pretreatment processes work effectively. * **Quality Verification:** Request certified test reports including tensile properties, elongation, and chemical analysis to ensure material meets Class 1 requirements. **In summary, AK Steel ASTM A607 Class 1, Grade 50K represents a state-of-the-art HSLA steel that successfully bridges the gap between high strength and excellent formability. Its microalloyed, ultra-low-carbon chemistry enables the production of complex formed components at 50 ksi yield strength, making it an essential material for advanced lightweighting strategies in the transportation and equipment manufacturing sectors. Proper application of this material requires understanding its unique balance of properties and adjusting fabrication practices accordingly to fully realize its performance benefits.** -:- For detailed product information, please contact sales. -: AK Steel ASTM A 607 Class 1 Formable, Grade 50K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy (HSLA) Specification Dimensions Size： Diameter 20-1000 mm Length <4566 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 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 1 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 1 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 1 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 1037 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