ASTM A832 Low Alloy Steel Foil/Strip

ASTM A832 Low Alloy Steel Foil Product Information -:- For detailed product information, please contact sales. -: ASTM A832 Low Alloy Steel Foil Synonyms -:- For detailed product information, please contact sales. -:

ASTM A832 Low Alloy Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A832 Low-Alloy Steel for Pressure Vessels** **ASTM A832** is a specialized **chromium-vanadium low-alloy steel** specifically designed for **welded pressure vessels and structural components operating at elevated temperatures**. This steel is characterized by its **excellent strength retention, creep resistance, and oxidation resistance at service temperatures up to 650°F (345°C)**. The material achieves its properties through a combination of **chromium and vanadium alloying** along with appropriate **normalizing and tempering heat treatment**. ASTM A832 is primarily used in applications where carbon steel lacks sufficient strength at elevated temperatures and where costlier chromium-molybdenum steels are not economically justified. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A832/A832M** - Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Vanadium. * **Heat Treatment Requirement:** Plates are supplied in the **normalized and tempered condition** to develop optimal mechanical properties and microstructural stability. * **ASME Code Equivalent:** **SA-832/SA-832M** in ASME Boiler and Pressure Vessel Code, Section II, Part A. This is the mandatory specification for ASME-stamped pressure equipment. * **Governing Standard:** **ASTM A20/A20M** - Standard Specification for General Requirements for Steel Plates for Pressure Vessels. * **Key Advantage:** Provides better elevated temperature properties than carbon-manganese steels while being more cost-effective than chromium-molybdenum steels for moderate temperature service. --- ## **Chemical Composition (Weight %, max unless range is specified)** The composition is specifically designed to enhance strength and oxidation resistance at elevated temperatures through chromium and vanadium alloying. | Element | Composition (%) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.17 - 0.23 | Provides strength and hardenability; carefully controlled for weldability. | | **Manganese (Mn)** | 0.40 - 0.70 | Enhances strength and hardenability while maintaining good toughness. | | **Phosphorus (P)** | 0.035 max | Impurity, kept low. | | **Sulfur (S)** | 0.040 max | Impurity, controlled for weldability and ductility. | | **Silicon (Si)** | 0.15 - 0.50 | Deoxidizer and solid solution strengthener. | | **Chromium (Cr)** | **0.75 - 1.20** | **Primary alloying element.** Enhances oxidation resistance at elevated temperatures and increases hardenability. | | **Vanadium (V)** | **0.13 - 0.18** | **Critical strengthening element.** Forms stable carbides that provide precipitation strengthening and improve creep resistance at elevated temperatures. | | **Molybdenum (Mo)** | 0.08 max | Residual element, may be present in small amounts. | | **Copper (Cu)** | 0.35 max | Residual element. | **Note:** The specific balance of chromium and vanadium is optimized to provide the best combination of strength and elevated temperature performance while maintaining reasonable weldability. --- ## **Typical Physical & Mechanical Properties** Properties are for normalized and tempered plates. The elevated temperature properties are a key feature of this steel. | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 550 - 690 MPa (80,000 - 100,000 psi) | | **Yield Strength (min)** | **415 MPa (60,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | 18% | | **Reduction of Area (min)** | 45% | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Density** | ~7.85 g/cm³ (0.284 lb/in³) | | **Charpy V-Notch Impact Toughness** | **Test Temperature:** **70°F (21°C)**. **Minimum Avg. for 3 Specimens:** **25 ft·lbf (34 J)**. | | **Elevated Temperature Yield Strength** | Maintains significantly higher strength than carbon steels at temperatures above 400°F (205°C). | | **Maximum Recommended Service Temperature** | Approximately **650°F (345°C)** for extended service. | | **Brinell Hardness (typical)** | 190 - 240 HBW | --- ## **Product Applications** ASTM A832 is specified for pressure vessels and components operating at elevated temperatures where enhanced strength and oxidation resistance are required but where more expensive alloy steels are not necessary. **Primary Industries and Equipment:** 1. **Power Generation:** * **Intermediate and High-Pressure Feedwater Heaters**. * **Steam Drums** and **Headers** in moderate-pressure boiler systems. * **Moisture Separator Reheaters (MSRs)** and associated piping. 2. **Petrochemical & Refining:** * **Process Vessels** operating in the 400-650°F (205-345°C) temperature range. * **Heat Exchanger Shells** for hot oil and process streams. * **Fractionation Columns** and **Separators** in moderate-temperature service. 3. **Industrial Processing:** * **Autoclaves** and **reactors** for chemical processing. * **Heat Treating Equipment** components. * **Dryers** and **ovens** in manufacturing facilities. 4. **General Pressure Vessel Applications:** * **Custom pressure vessels** requiring better elevated temperature properties than carbon steel but not requiring the full capabilities of Cr-Mo steels. --- ## **Advantages and Critical Fabrication Considerations** * **Advantages:** * **Good Elevated Temperature Strength:** Superior to carbon steels at temperatures above 400°F (205°C). * **Improved Oxidation Resistance:** Chromium content provides better resistance to scaling at elevated temperatures. * **Cost-Effective Alternative:** Provides better performance than carbon steel at a lower cost than chromium-molybdenum steels for moderate temperature applications. * **Good Toughness:** Maintains adequate impact properties for pressure vessel applications. * **Critical Fabrication & Welding Considerations:** * **Welding Requirements:** **Low-hydrogen welding practices are essential.** The chromium and vanadium content increase hardenability, making the steel more susceptible to hydrogen-induced cracking. Preheat and interpass temperature control are mandatory. * **Preheat Temperature:** Typically **300-400°F (150-205°C)** depending on thickness and restraint. Higher than for carbon steels of equivalent thickness. * **Post-Weld Heat Treatment (PWHT):** **Generally required** for pressure vessel fabrication to relieve residual stresses and temper the heat-affected zone. PWHT parameters must be carefully controlled. * **Welding Consumables:** Should be selected to match or slightly undermatch the base metal strength. Low-hydrogen electrodes with appropriate alloy content are necessary. * **Thermal Cutting:** Requires preheat for flame cutting to prevent hydrogen cracking. Plasma or laser cutting is preferred for critical applications. * **Creep Considerations:** For long-term service at elevated temperatures, design should consider creep properties, though A832 offers better creep resistance than carbon steels. * **Not for Severe Conditions:** Not recommended for hydrogen service at elevated temperatures or for highly corrosive environments without proper evaluation. **In summary, ASTM A832 is a cost-effective chromium-vanadium low-alloy steel that fills the performance gap between carbon steels and more expensive chromium-molybdenum alloys for moderate elevated temperature service. Its 60 ksi minimum yield strength combined with improved oxidation resistance makes it suitable for a range of pressure vessel applications in power generation and process industries, though it requires careful attention to welding and heat treatment procedures to ensure optimal performance and integrity.** -:- For detailed product information, please contact sales. -: ASTM A832 Low Alloy Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4547 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 A832 Low Alloy Steel Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A832 Low Alloy Steel Foil -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A832 Low Alloy Steel Foil -:- For detailed product information, please contact sales. -:

Packing of ASTM A832 Low Alloy Steel Foil/Strip -:- 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 Foil/Strip 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 1018 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