ASTM A724 Carbon Steel Wire, Grade A

ASTM A724 Carbon Steel Wire, Grade A Product Information -:- For detailed product information, please contact sales. -: ASTM A724 Carbon Steel Wire, Grade A Synonyms -:- For detailed product information, please contact sales. -:

ASTM A724 Carbon Steel, Grade A Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A724 Grade A Carbon Steel Plate for Pressure Vessels** **ASTM A724 Grade A** is a specialized **carbon-manganese-silicon steel plate** intended specifically for **welded layered pressure vessels**. It is characterized by a unique manufacturing process: plates are produced to be subsequently **split (divided) into two or more layers** during fabrication. This split-layer construction technique allows for the creation of exceptionally thick-walled vessels with superior through-thickness properties and residual stress management. Grade A is the base strength grade within this specification, offering a robust combination of strength, weldability, and cost-effectiveness for high-pressure applications in the chemical, petrochemical, and power industries. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A724 / A724M** - Standard Specification for Pressure Vessel Plates, Carbon-Manganese-Silicon Steel, for Quenched-and-Tempered Layered Pressure Vessels. * **Governing Standard:** The standard includes mandatory requirements for simulated post-weld heat treatment (SPWHT) testing to ensure stability of properties after fabrication. * **Key Processing Requirement:** Plates are supplied in the **quenched-and-tempered (Q&T) condition**, providing a uniform, fine-grained tempered martensitic or bainitic microstructure essential for the splitting process and final performance. * **ASME Code Equivalent:** **SA-724 / SA-724M** in ASME Boiler and Pressure Vessel Code, Section II, Part A, for ASME-stamped equipment. --- ## **Chemical Composition (Weight %, max unless range is specified)** The composition is tightly controlled to achieve the required hardenability for quenching and to ensure good weldability and notch toughness. Grade A has the following typical limits: | Element | Composition (%) | | :--- | :--- | | **Carbon (C)** | 0.15 - 0.21 | | **Manganese (Mn)** | 1.00 - 1.35 | | **Phosphorus (P)** | 0.025 | | **Sulfur (S)** | 0.025 | | **Silicon (Si)** | 0.15 - 0.50 | | **Nickel (Ni)** | 0.40 (optional, for enhanced toughness) | | **Chromium (Cr)** | 0.25 | | **Molybdenum (Mo)** | 0.08 | | **Vanadium (V)** | 0.05 | | **Copper (Cu)** | 0.35 | **Key Notes:** * The carbon and manganese ranges are optimized to ensure sufficient hardenability for the Q&T process while maintaining a low carbon equivalent for weldability. * Low levels of Cr, Mo, and V may be present from the base steel; their combined total is limited. --- ## **Typical Physical & Mechanical Properties** Properties are for quenched-and-tempered plates, as tested in the longitudinal direction. | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 550 - 690 MPa (80,000 - 100,000 psi) | | **Yield Strength (min)** | **345 MPa (50,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | 18% | | **Reduction of Area (min)** | 38% | | **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:** **-30°F (-34°C)**. **Minimum Avg. for 3 Specimens:** 20 ft·lbf (27 J). **Minimum Single Value:** 15 ft·lbf (20 J). | | **Simulated PWHT Requirement:** | Mechanical properties must be met **after** a simulated post-weld heat treatment (typically 1150°F ± 25°F / 620°C ± 14°C for a specified time), ensuring stability during vessel fabrication. | --- ## **Product Applications** ASTM A724 Grade A is an engineered material for a specific, high-end fabrication technique: **multilayer (wrapped or layered) pressure vessel construction.** **Primary Applications:** 1. **High-Pressure Process Vessels:** * **Ammonia Converters** and synthesis reactors in fertilizer plants. * **Methanol Synthesis Reactors.** * **Hydrocrackers** and **Hydrotreaters** in oil refineries. * **High-Pressure Separators** and **Scrubbers.** 2. **Gas Storage & Transportation:** * **Large-diameter, high-pressure vessels** for gas storage (e.g., hydrogen, natural gas). * **Tube trailers** and stationary storage banks for industrial gases. 3. **Power Generation:** * **Hydrogen Coolers** and associated high-pressure vessels in power plants. **Advantages of the Split-Layer (A724) Construction:** * **Superior Through-Thickness Properties:** The splitting process creates a fine grain structure on the split faces, improving short-transverse properties. * **Residual Stress Mitigation:** Layered construction results in lower through-thickness residual stresses compared to monolithic thick plates, enhancing resistance to stress corrosion cracking (SCC). * **Fabrication Flexibility:** Allows construction of vessels with diameters and thicknesses that are impractical with forged or rolled monolithic shells. * **Safety:** The layered design can inherently limit crack propagation. --- ## **Advantages and Critical Fabrication Considerations** * **Advantages:** * **Proven Performance for Critical Service:** Designed for severe high-pressure, high-temperature hydrogen service and other demanding environments. * **Excellent Toughness:** Guaranteed CVN properties at -30°F ensure performance in low-temperature startups or upsets. * **Stable Properties:** The mandatory SPWHT requirement guarantees mechanical properties after fabrication heat treatment. * **Critical Fabrication & Welding Considerations:** * **Specialized Fabrication:** Requires fabricators experienced in multilayer vessel techniques (shrink-fitting, layering, banding). * **Stringent Welding Protocols:** **Mandatory use of low-hydrogen processes and procedures.** Welding Procedure Specifications (WPS) must be qualified to account for the Q&T base metal. * **Post-Weld Heat Treatment (PWHT):** A full PWHT cycle is a standard part of vessel fabrication, following the parameters used in the plate's simulation test. * **Not a General-Purpose Plate:** It is a premium, application-specific material. Its cost and processing are justified only for the unique advantages of layered construction. **In summary, ASTM A724 Grade A is a high-performance, quenched-and-tempered carbon steel plate engineered exclusively for the demanding requirements of welded multilayer pressure vessels. Its guaranteed properties after simulated PWHT, combined with the inherent benefits of layered construction, make it a critical material for the safe and reliable containment of high-pressure processes in the energy and chemical industries.** -:- For detailed product information, please contact sales. -: ASTM A724 Carbon Steel, Grade A Specification Dimensions Size： Diameter 20-1000 mm Length <4518 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 A724 Carbon Steel, Grade A Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A724 Carbon Steel Wire, Grade A -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A724 Carbon Steel Wire, Grade A -:- For detailed product information, please contact sales. -:

Packing of ASTM A724 Carbon Steel Wire, Grade A -:- 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 Wire 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 989 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