ASTM A517 Low Alloy Steel Seamless tube, Grade H

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

ASTM A517 Low Alloy Steel, Grade H Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A517 Grade H: High-Strength Quenched and Tempered Alloy Steel** #### **1. Overview** ASTM A517 is a standard specification for high-strength, quenched and tempered alloy steel plates intended for use in pressure vessels and other critical applications. **Grade H** is a distinct grade within this family, known for its excellent combination of ultra-high strength and good toughness. This is achieved through a precise chemical composition and a controlled heat treatment process of quenching and tempering. A key characteristic of Grade H is its ability to maintain these superior mechanical properties in relatively thick sections, making it a prime choice for weight-saving designs in demanding, high-stress environments. #### **2. Chemical Composition** The chemical composition of ASTM A517 Grade H is meticulously balanced to provide high hardenability and strength. The following table outlines the required percentages (by heat analysis): | Element | Composition (%) | | :--- | :--- | | Carbon (C) | 0.20 - 0.30 | | Manganese (Mn) | 0.60 - 1.00 | | 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) | 0.0005 - 0.0050 | | Vanadium (V) | 0.02 - 0.10 | **Key Alloying Roles:** * **Carbon:** Provides the primary basis for strength and hardness. The carbon range for Grade H is typically higher than in Grades E and F. * **Manganese:** Enhances hardenability and contributes to solid solution strengthening. * **Nickel & Chromium:** Improve hardenability, toughness, and strength, particularly in thicker cross-sections. * **Molybdenum:** A potent hardenability agent that also provides secondary hardening during tempering and improves strength at elevated temperatures. * **Boron:** A highly effective element for dramatically increasing hardenability, allowing for the high strength in thick sections. * **Vanadium:** Contributes to grain refinement and precipitation strengthening through the formation of vanadium carbides. #### **3. Physical & Mechanical Properties** ASTM A517 Grade H 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 x 10^-6/°F (11.7 x 10^-6/°C) from 68-212°F (20-100°C) #### **4. Product Applications** The primary advantage of ASTM A517 Grade H is its exceptional strength-to-weight ratio, which enables the construction of lighter, more efficient, and more portable structures without compromising performance or safety. Its typical applications include: * **Pressure Vessels:** For high-pressure storage tanks, chemical reactors, and separators in the oil, gas, and petrochemical industries. * **Lifting and Construction Equipment:** Critical components in mobile cranes, boom sections, and excavator arms where high strength reduces weight and increases lifting capacity or reach. * **Mining and Earth-Moving Equipment:** Used in shovel bases, buckets, and support frames subject to extreme loads and abrasion. * **Structural Components:** In bridges, offshore platform modules, and other engineered structures where minimizing material thickness is crucial. * **Transportation:** For key structural members in heavy-duty trucks and trailers. #### **5. International Standards & Equivalents** While ASTM A517 is an American standard, Grade H has functional equivalents in other international standards. It is critical to note that these are not direct substitutes, and a detailed comparison of chemical and mechanical requirements is necessary for any cross-standard application. | Standard | Equivalent Grade | Key Differences / Notes | | :--- | :--- | :--- | | **ASTM A517** | **Grade H** | The base specification. | | **EN 10028-6** | **S690Q** | A European standard for quenched and tempered steels with a minimum yield strength of 690 MPa. The chemistry, particularly carbon content, may differ. | | **ISO 4950-3** | **EQ 70** | An international standard for high-yield strength steel products. | | **JIS G 3128** | **SHY 685** | A Japanese high-yield strength steel plate. | **Important Note on Fabrication:** Fabricating ASTM A517 Grade H requires stringent controls, especially for **welding**. Its high hardenability makes it susceptible to hydrogen-induced cracking (HIC) in the heat-affected zone (HAZ). Essential welding practices include: * **Strict Pre-heating** and **Interpass Temperature Control**. * Use of certified **low-hydrogen welding electrodes** and processes. * Proper **Post-Weld Heat Treatment (PWHT)** is often mandatory to relieve residual stresses and temper the HAZ, restoring toughness and preventing service failure. --- **Disclaimer:** The information provided here is for general reference and informational purposes only. For critical design and fabrication, the latest version of the official **ASTM A517** standard and consultation with qualified materials and welding engineers are essential. -:- For detailed product information, please contact sales. -: ASTM A517 Low Alloy Steel, Grade H Specification Dimensions Size： Diameter 20-1000 mm Length <4412 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 H Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A517 Low Alloy Steel Seamless tube, Grade H -:- 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 Seamless tube 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 883 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