ASTM A517 Low Alloy Steel, Grade Q

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

ASTM A517 Low Alloy Steel, Grade Q Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A517 Grade Q: 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 Q** is a specialized grade within this family, formulated with a specific chemical composition that provides an excellent balance of ultra-high strength, good toughness, and enhanced hardenability. This grade achieves its superior mechanical properties through controlled quenching and tempering processes, making it particularly suitable for applications requiring reliable performance under demanding service conditions. #### **2. Chemical Composition** The chemical composition of ASTM A517 Grade Q is carefully balanced to provide optimal hardenability and mechanical properties. The following table outlines the required percentages (by heat analysis): | Element | Composition (%) | | :--- | :--- | | Carbon (C) | 0.15 - 0.21 | | Manganese (Mn) | 1.20 - 1.50 | | Phosphorus (P) | 0.035 max | | Sulfur (S) | 0.035 max | | Silicon (Si) | 0.15 - 0.35 | | Nickel (Ni) | 0.70 - 1.00 | | Chromium (Cr) | 0.40 - 0.65 | | Molybdenum (Mo) | 0.40 - 0.60 | | Boron (B) | 0.0015 - 0.0050 | | Vanadium (V) | 0.03 - 0.08 | **Key Alloying Roles:** * **Carbon & Manganese:** Provide fundamental strength and hardenability, with higher manganese content enhancing hardenability * **Nickel:** Improves toughness and hardenability without significantly increasing brittleness * **Chromium & Molybdenum:** Enhance hardenability, strength, and tempering resistance * **Boron:** A powerful hardenability intensifier that permits high strength with leaner alloy content * **Vanadium:** Contributes to grain refinement and precipitation strengthening #### **3. Physical & Mechanical Properties** ASTM A517 Grade Q 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 and good toughness makes ASTM A517 Grade Q suitable for various demanding applications: * **Pressure Vessels:** High-pressure storage tanks, reactors, and heat exchangers * **Structural Components:** Heavy construction equipment, crane booms, and support structures * **Mining Equipment:** Shovel components, drill rigs, and other high-stress mining applications * **Transportation Equipment:** Critical components for heavy-duty vehicles and trailers * **Energy Sector:** Components for hydraulic turbines and power generation equipment #### **5. International Standards & Equivalents** ASTM A517 Grade Q has functional equivalents in other international standards: | Standard | Equivalent Grade | Notes | | :--- | :--- | :--- | | **ASTM A517** | **Grade Q** | Base specification | | **EN 10028-6** | **S690Q** | European equivalent with similar strength characteristics | | **ISO 4950-3** | **EQ 70** | International standard for high-yield strength steels | **Important Fabrication Considerations:** * **Welding:** Requires pre-heating and low-hydrogen welding processes * **Post-Weld Heat Treatment:** Typically required for stress relief * **Quality Assurance:** Charpy V-notch testing mandatory to verify impact toughness * **Section Size Limitations:** Mechanical properties specified for specific thickness ranges --- **Disclaimer:** This information is for reference purposes only. For critical applications, consult the latest ASTM A517 standard and qualified materials engineers. Actual properties may vary by manufacturer and specific heat treatment processes. -:- For detailed product information, please contact sales. -: ASTM A517 Low Alloy Steel, Grade Q Specification Dimensions Size： Diameter 20-1000 mm Length <4416 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 Q Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A517 Low Alloy Steel, Grade Q -:- 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 887 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