ASTM A517 Low Alloy Steel Sheet,Plate, Grade M

ASTM A517 Low Alloy Steel Sheet/Plate, Grade M Product Information -:- For detailed product information, please contact sales. -: ASTM A517 Low Alloy Steel Sheet/Plate, Grade M Synonyms -:- For detailed product information, please contact sales. -:

ASTM A517 Low Alloy Steel, Grade M Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A517 Grade M: High-Strength Quenched and Tempered Alloy Steel** #### **1. Overview** ASTM A517 is a standard specification for high-strength, quenched and tempered alloy steel plates primarily used in pressure vessels and other critical applications. **Grade M** represents a specific chemistry within this family, designed to provide an optimal balance of ultra-high strength, good toughness, and **excellent weldability**. This grade achieves its superior mechanical properties through precise chemical composition control and rigorous heat treatment (quenching and tempering), making it particularly suitable for heavily loaded welded structures where fabrication integrity is paramount. #### **2. Chemical Composition** The chemical composition of ASTM A517 Grade M is carefully balanced to provide high hardenability while maintaining good weldability. The following table outlines the required percentages (by heat analysis): | Element | Composition (%) | | :--- | :--- | | Carbon (C) | 0.20 - 0.30 | | Manganese (Mn) | 1.10 - 1.50 | | Phosphorus (P) | 0.035 max | | Sulfur (S) | 0.035 max | | Silicon (Si) | 0.15 - 0.35 | | Nickel (Ni) | 0.90 - 1.20 | | Chromium (Cr) | 0.40 - 0.65 | | Molybdenum (Mo) | 0.40 - 0.60 | | Boron (B) | 0.0015 - 0.0050 | | Vanadium (V) | 0.02 - 0.10 | **Key Alloying Roles:** * **Carbon & Manganese:** Provide fundamental strength and hardenability. The higher manganese range enhances hardenability while maintaining good ductility. * **Nickel:** Significantly improves toughness, particularly at low temperatures, and enhances hardenability. * **Chromium & Molybdenum:** Work synergistically to increase hardenability, strength, and tempering resistance. Molybdenum also helps prevent temper embrittlement. * **Boron:** A powerful hardenability intensifier that allows for high strength with leaner overall alloy content. * **Vanadium:** Contributes to grain refinement and precipitation strengthening through vanadium carbide formation. #### **3. Physical & Mechanical Properties** ASTM A517 Grade M is supplied in the quenched and tempered condition. The following mechanical properties are typically required for plates up to 2.5 inches (63.5 mm) in thickness: | Property | Requirement | | :--- | :--- | | **Tensile Strength** | 115 - 135 ksi (790 - 930 MPa) | | **Yield Strength (min)** | 100 ksi (690 MPa) | | **Elongation in 2-in (50 mm) (min)** | 16% | | **Reduction of Area (min)** | 50% | | **Hardness (Brinell)** | Typically 235 - 293 HBW | **Impact Toughness:** * **Charpy V-Notch (CVN) Impact Test:** Required at **-50°F (-46°C)**. * **Minimum Average Value:** 15 ft-lb (20 J) for longitudinal specimens. **Physical Properties (Typical Values):** * **Density:** 0.284 lb/in³ (7850 kg/m³) * **Modulus of Elasticity:** 29,000 ksi (200 GPa) * **Poisson's Ratio:** 0.29 * **Coefficient of Thermal Expansion:** ~6.5 × 10⁻⁶/°F (11.7 × 10⁻⁶/°C) from 68-212°F (20-100°C) #### **4. Product Applications** The combination of high strength, good toughness, and enhanced weldability makes ASTM A517 Grade M particularly valuable for complex fabricated structures subject to heavy loading and demanding service conditions. * **Pressure Vessels:** For high-pressure storage tanks, reactor vessels, and heat exchangers in the petrochemical and power generation industries. * **Structural Components:** In bridges, offshore platforms, and heavy construction equipment where welded connections are critical to structural integrity. * **Mining Equipment:** Shovel bases, support frames, and other components requiring high strength and resistance to impact loading. * **Hydraulic Turbines:** Penstocks and other components subject to high water pressure. * **Lifting Equipment:** Critical welded components in mobile cranes and excavator booms. #### **5. International Standards & Equivalents** ASTM A517 Grade M has functional equivalents in other international standards, though direct substitution requires careful evaluation of specific requirements. | Standard | Equivalent Grade | Key Differences / Notes | | :--- | :--- | :--- | | **ASTM A517** | **Grade M** | The base specification. | | **EN 10028-6** | **S690Q** | A European standard for quenched and tempered steels with similar strength levels. | | **ISO 4950-3** | **EQ 70** | International standard for high-yield strength steel products. | | **JIS G 3128** | **SHY 685** | Japanese high-yield strength steel plate with comparable mechanical properties. | **Important Note on Fabrication:** While Grade M is designed with improved weldability characteristics, proper fabrication practices remain essential: * **Welding:** Requires use of low-hydrogen welding processes and consumables * **Pre-heating:** Necessary for most applications to prevent hydrogen-induced cracking * **Post-Weld Heat Treatment (PWHT):** Often required to relieve residual stresses and ensure optimal performance in the heat-affected zone * **Procedure Qualification:** Welding procedures should be qualified according to applicable standards (e.g., ASME Section IX) --- **Disclaimer:** The information provided here is for reference purposes only. For critical design and fabrication, the latest version of the official **ASTM A517** standard and consultation with qualified materials engineers are essential. Actual properties may vary depending on manufacturing processes and heat treatment parameters. -:- For detailed product information, please contact sales. -: ASTM A517 Low Alloy Steel, Grade M Specification Dimensions Size： Diameter 20-1000 mm Length <4414 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. -: ASTM A517 Low Alloy Steel, Grade M Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A517 Low Alloy Steel Sheet,Plate, Grade M -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A517 Low Alloy Steel Sheet,Plate, Grade M -:- For detailed product information, please contact sales. -:

Packing of ASTM A517 Low Alloy Steel Sheet/Plate, Grade M -:- 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 Sheet/Plate 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 885 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