ASTM A414 Grade D Pressure Vessel Steel

ASTM A414 Grade D Pressure Vessel Steel, Composition Spec Product Information -:- For detailed product information, please contact sales. -: ASTM A414 Grade D Pressure Vessel Steel, Composition Spec Synonyms -:- For detailed product information, please contact sales. -:

ASTM A414 Grade D Pressure Vessel Steel, Composition Spec Product Information -:- For detailed product information, please contact sales. -: ### **Product Name:** ASTM A414 Grade D Pressure Vessel Steel (Composition Specified) **Classification:** Carbon Steel Sheet for Pressure Vessels with Enhanced Manganese Content --- ### **1. Overview** ASTM A414 Grade D (with composition specified) is a specialized carbon-manganese steel sheet specification designed for fusion-welded pressure vessels. Positioned uniquely within the ASTM A414 family, Grade D is distinguished by its **significantly higher manganese content** compared to Grades A, B, and C. This characteristic is reflected in its chemical designation. The **"Composition Specified"** ordering condition means the material's primary acceptance criteria are its chemical composition limits, while the resulting mechanical properties are developed through processing and reported for information. This grade is engineered to provide higher strength levels directly through robust solid-solution strengthening from manganese, making it suitable for applications requiring greater load-bearing capacity from sheet material without a proportional increase in carbon content. ### **2. Chemical Composition (Weight %, Heat Analysis)** Per ASTM A414/A414M. Chemistry is the defining and controlling specification for this order type. | Element | Minimum (%) | Maximum (%) | Notes | |---------|------------|------------|-------| | **Carbon (C)** | - | 0.23 | Controlled carbon level, higher than Grade A but similar to Grade B, balanced for strength and weldability. | | **Manganese (Mn)** | 0.90 | 1.40 | **The Key Distinguishing Feature.** This high manganese range (minimum 0.90%, exceeding Grades A-C) is the primary driver for achieving higher yield and tensile strength through potent solid-solution strengthening. | | **Phosphorus (P)** | - | 0.035 | Standard impurity control. | | **Sulfur (S)** | - | 0.040 | Standard impurity control. | | **Silicon (Si)** | 0.15 | 0.30 | Ensures a fully killed (deoxidized) steel, promoting a uniform microstructure essential for consistent formability and weld integrity. | | **Copper (Cu)** *when specified* | 0.20 | - | Optional element for improved atmospheric corrosion resistance. | **Key Distinction:** For "Composition Specified" Grade D, **strict adherence to the chemical limits is mandatory**. The mechanical properties are a consequence of this controlled chemistry and the thermomechanical processing. They are reported but do not form the basis for acceptance, unlike a "Physical Specified" order. ### **3. Physical & Mechanical Properties** *Properties are typical for hot-rolled or cold-rolled sheet produced to the Grade D composition.* **Reported Mechanical Properties (Typical, for information):** * **Tensile Strength (Rm):** 58,000 - 78,000 psi (400 - 540 MPa) [Reported Value] * **Yield Strength (Re, 0.2% offset):** 32,000 - 42,000 psi (220 - 290 MPa) [Reported Value] * **Elongation (A, min in 2 in.):** 20% min (Typical expectation) **Impact Properties:** * **Not Required:** ASTM A414 does **not** require Charpy V-notch impact testing. Therefore, it is **not suitable for low-temperature service** and is restricted to temperatures above 32°F (0°C). The high manganese content can improve toughness relative to carbon at a given strength, but it is not quantified or guaranteed by this specification. **Physical Properties (Typical):** * **Density:** 0.284 lb/in³ (7.85 g/cm³) * **Modulus of Elasticity:** 29 x 10⁶ psi (200 GPa) * **Thermal Conductivity:** ~ 48 W/m·K (at 20°C) ### **4. Key Characteristics** * **Manganese-Strengthened:** Derives its strength primarily from high manganese content (0.90-1.40%), offering a favorable alternative to increasing carbon for strength enhancement, which can be detrimental to weldability and toughness. * **Good Strength-to-Formability Ratio:** Provides higher strength than Grades A-C while potentially retaining better formability than a similarly strong high-carbon steel due to manganese's beneficial effect on austenite stability during forming. * **Weldability (Requires Procedure):** The combination of carbon and high manganese results in a higher carbon equivalent. Welding requires careful procedure qualification using low-hydrogen practices, controlled heat input, and likely pre-heat for thicker sections to avoid cold cracking. * **Fully Killed Steel:** The silicon content ensures a sound, homogeneous internal structure. * **Application-Specific Design:** Fills a niche for sheet fabricators needing higher strength without moving to low-alloy or normalized plate steels. ### **5. Product Applications** ASTM A414 Grade D (Comp Spec) is used in pressure vessel applications where the higher strength afforded by its chemistry is needed, but fabrication constraints require sheet material: * **Higher-Pressure Receivers & Accumulators:** Air and gas storage vessels designed for elevated working pressures where wall thickness must be minimized. * **Boiler Shells:** For firetube or small watertube boilers operating at higher pressures. * **Process Equipment:** Vessels, columns, or housings in chemical or industrial processing where internal pressure or mechanical loads demand higher strength from formed sheet components. * **Transportation Tanks:** Components for pressure tanks where material strength and weight are optimizing factors (subject to overriding DOT or other regulatory specs). * **Heads for High-Strength Vessels:** Dished heads where the parent shell is made from a higher strength plate (e.g., A516 Gr. 60/65) and a matching or suitable head material is required. ### **6. International Standards & Specifications** | Region | Standard & Designation | Scope / Notes | |--------|----------------------|---------------| | **USA / ASTM** | **ASTM A414/A414M** | Standard Specification for Carbon Steel Sheet for Pressure Vessels. **Grade D** is defined by its unique chemistry, particularly high Mn. | | **USA / ASME** | **ASME SA-414** | Identical adoption for code construction. | | **European Union (EU)** | **EN 10028-2** | No direct equivalent due to the specific chemistry-based definition. The closest in *application* might be **P295GH** or **P305GH**, which are normalized plates with guaranteed properties, not chemistry-defined sheets. | | **International / ISO** | **ISO 9328-2** | Similar strength grades like **P295GH** are functional *performance* equivalents. | | **Japan** | **JIS G3116 SPV 360** | May offer similar tensile strength performance. | **Critical Note:** The A414 series is for **sheet**. For applications requiring guaranteed properties and impact toughness, **ASTM A516 Grades 60/65** (plate) are the standard, even if fabricated into similar shapes. ### **7. Available Forms & Processing** * **Standard Forms:** **Sheets** (cut lengths) and **strip** (coils). * **Condition:** Typically supplied as **hot-rolled**. * **Fabrication:** * **Forming:** Good hot forming characteristics. Cold forming is possible but may require more power and careful attention to avoid cracking on tight bends due to higher strength. * **Welding:** **Requires a qualified WPS.** Mandatory use of low-hydrogen electrodes (e.g., E7018). Pre-heat of 150-300°F (65-150°C) is commonly recommended. Post-Weld Heat Treatment (PWHT) is often advisable to relieve stresses and temper the heat-affected zone. * **Cutting:** Standard thermal and mechanical cutting methods apply. ### **8. Selection Guidance** **Choose ASTM A414 Grade D (Comp Spec) when:** * A **specific, chemistry-driven high-manganese steel sheet** is specified or desired. * The application requires **higher strength than A414 Grades A-C** but must use sheet product forms. * The fabricator has expertise in welding higher carbon-equivalent steels and can implement necessary controls. * The service is **ambient temperature and pressure is the primary design driver**. **Consider alternatives or specify carefully if:** * **Low-temperature toughness** is required (choose an impact-tested grade like A516). * **Guaranteed minimum mechanical properties** are a contractual or code requirement for material purchase (choose "Physical Specified" or a different specification). * Maximum fabricability (ease of forming/welding) is the top priority. --- **Disclaimer:** This technical summary is for informational purposes. **ASTM A414 Grade D is not for low-temperature service and presents welding challenges.** The "Composition Specified" condition places responsibility for final part properties on the fabricator. All design, material selection, fabrication, and inspection must comply with the governing pressure vessel code (e.g., ASME Section VIII). Always consult the latest **ASTM A414/A414M** specification and involve qualified engineering personnel. -:- For detailed product information, please contact sales. -: ASTM A414 Grade D Pressure Vessel Steel, Composition Spec Specification Dimensions Size： Diameter 20-1000 mm Length <7392 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 A414 Grade D Pressure Vessel Steel, Composition Spec Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A414 Grade D Pressure Vessel Steel, Composition Spec -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A414 Grade D Pressure Vessel Steel, Composition Spec -:- For detailed product information, please contact sales. -:

Packing of ASTM A414 Grade D Pressure Vessel Steel, Composition Spec -:- 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 3863 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