Spherical ASTM A516, Grade 55

ASTM A516, Grade 55 Product Information -:- For detailed product information, please contact sales. -: ASTM A516, Grade 55 Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A516, Grade 55 characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A516, Grade 55 Particle Size -:- For detailed product information, please contact sales. -: -:- -:- 0-15μm ,5-25μm, 15-45μm, 15-53μm,20-63um, 45-75μm, 45-105μm, 45-150μm ,75-150μm. (Various granularities can be customized according to customer requirements) -:- For detailed product information, please contact sales. -:

Spherical ASTM A516, Grade 55 Applicable processes -:- For detailed product information, please contact sales. -: Laser/electron beam additive manufacturing (SLM/EBM, 3D printing) Direct laser deposition (DLD) Used in thermal spray (TSA) Powder hot isostatic pressing (HIP) Metal injection molding (MIM) Powder metallurgy (PM) Laser cladding (LC), etc. -:- For detailed product information, please contact sales. -: Spherical ASTM A516, Grade 55 Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: ASTM A516, Grade 55 Product Information -:- For detailed product information, please contact sales. -: ### **Product Name:** ASTM A516, Grade 55 **Classification:** Pressure Vessel Quality Carbon Steel Plate for Moderate and Lower Temperature Service --- ### **1. Overview** ASTM A516 Grade 55 is a normalized carbon-manganese-silicon steel plate specifically designed for welded pressure vessels where improved notch toughness is required, particularly for service at lower temperatures. As part of the A516 specification, it represents the lower end of the strength spectrum within this family, offering an optimal balance of strength, weldability, and guaranteed toughness. Unlike ASTM A285 steels, A516 grades are **required to be normalized** and must meet Charpy V-notch impact energy requirements, making them the material of choice for a wide range of critical pressure equipment operating at or below ambient temperature. ### **2. Chemical Composition (Weight %, Heat Analysis)** As specified in ASTM A516/A516M. Chemistry is tightly controlled to ensure weldability and toughness. | Element | Minimum (%) | Maximum (%) | Notes | |---------|------------|------------|-------| | **Carbon (C)** | - | 0.18 | Lower maximum carbon ensures good weldability and toughness. | | **Manganese (Mn)** | 0.60 | 1.20 | Higher manganese range than A285 grades; contributes significantly to strength and hardenability, and improves low-temperature toughness. | | **Phosphorus (P)** | - | 0.025 | More stringent limit than A285 for improved toughness. | | **Sulfur (S)** | - | 0.025 | More stringent limit for better weldability and formability. | | **Silicon (Si)** | 0.13 | 0.45 | The high silicon content (compared to A285) ensures the steel is fully killed (fully deoxidized) and contributes to strength through solid solution strengthening. | | **Carbon Equivalent (CE)** | - | Calculated | CE is typically calculated per ASTM A20 (e.g., C + Mn/6). Grade 55 has a relatively low CE, ensuring good weldability. | **Key Distinction:** Compared to A285, A516 Grade 55 has tighter controls on P and S, a mandatory Mn range (not just a max), and a significantly higher required Si content (min 0.13%), guaranteeing a fully killed, fine-grained, normalized microstructure. ### **3. Physical & Mechanical Properties** *Properties are for plates in the **normalized** condition. Thickness range typically up to 1.5 inches (38 mm) for full impact testing compliance.* **Mechanical Properties (Minimum & Typical):** * **Tensile Strength (Rm):** 55,000 - 75,000 psi (380 - 515 MPa) * **Yield Strength (Re, 0.2% offset):** 30,000 psi min (205 MPa min) * **Elongation (A, min):** * 8 in. (200 mm) Gauge Length: **21%** * **Charpy V-Notch Impact (CVN) - KEY FEATURE:** Required per specification. * **Test Temperature:** Typically **32°F (0°C)** for standard Grade 55. Lower temperatures can be specified (e.g., -20°F, -50°F). * **Minimum Average Energy:** **13 ft-lbf (18 J)** for longitudinal specimens. * **Hardness (typical):** ~ 140-170 HBW **Physical Properties (Typical):** * **Density:** 0.284 lb/in³ (7.85 g/cm³) * **Modulus of Elasticity:** 29 x 10⁶ psi (200 GPa) * **Thermal Conductivity:** ~ 50 W/m·K (at 20°C) ### **4. Key Characteristics** * **Guaranteed Notch Toughness:** The defining feature. Mandatory impact testing makes it suitable for low-temperature service down to approximately -20°F to -50°F (-29°C to -46°C), depending on the specified test temperature. * **Normalized Microstructure:** The normalization heat treatment refines the grain structure, ensuring uniform mechanical properties and enhanced toughness throughout the plate thickness. * **Excellent Weldability:** Low carbon content and controlled chemistry result in a low carbon equivalent. It is readily weldable with all standard processes using proper procedures and low-hydrogen electrodes. * **Improved Reliability:** Tighter chemical controls and normalized processing provide more consistent and predictable performance compared to as-rolled grades like A285. * **Good Formability:** Retains good ductility for cold forming operations. ### **5. Product Applications** ASTM A516 Grade 55 is a versatile, industry-standard material for pressure equipment requiring a combination of strength and toughness: * **Low-Temperature Pressure Vessels:** Storage tanks and process vessels for liquefied gases (e.g., LPG, ammonia, CO2), refrigerated storage, and cryogenic service (when specified for appropriate temperatures). * **Power Generation:** Deaerators, feedwater heaters, and other boiler components. * **Petrochemical & Chemical:** Reactors, separators, and scrubbers operating at ambient or sub-ambient temperatures. * **Oil & Gas:** Field separators, knockout drums, and gas processing equipment. * **General Industrial Pressure Vessels:** Where codes (like ASME) require impact-tested materials for temperatures below a certain threshold. ### **6. International Standards & Specifications** | Region | Standard & Designation | Scope / Notes | |--------|----------------------|---------------| | **USA / ASTM** | **ASTM A516/A516M** | Standard Specification for Pressure Vessel Plates, Carbon Steel, for Moderate- and Lower-Temperature Service. **Grades: 55, 60, 65, 70**. | | **USA / ASME** | **ASME SA-516** | Identical to ASTM A516 when adopted into the ASME Boiler and Pressure Vessel Code. | | **European Union (EU)** | **EN 10028-2** | **P275GH** or **P295GH** are very close equivalents in terms of strength and application. Both are normalized and have impact property requirements. | | **International / ISO** | **ISO 9328-2** | Steel grades such as **P275GH** or **P295GH** serve as direct functional equivalents. | | **Japan** | **JIS G3115 SB 480** | Comparable in tensile strength range and application. | ### **7. Available Forms & Processing** * **Standard Forms:** Supplied as **steel plates**. * **Condition:** Supplied in the **normalized (N)** condition. Stress Relieved (SR) or Simulated Post-Weld Heat Treated (SPWHT) conditions are also available per supplementary requirements. * **Fabrication:** * **Welding:** Excellent weldability. Standard low-hydrogen processes are used (SMAW: E7018; SAW; GMAW). Pre-heat may be required for thicker sections. * **Forming:** Well-suited for both cold and hot forming. The normalized condition provides consistent formability. * **Post-Weld Heat Treatment (PWHT):** Often performed on finished vessels to relieve residual stresses, especially for thicker sections. ### **8. Selection Guidance** **Choose ASTM A516 Grade 55 when:** * The pressure vessel code (e.g., ASME Section VIII) requires impact testing due to design metal temperature. * Service involves exposure to low ambient or process temperatures (down to approx. -50°F / -46°C). * A reliable, normalized material with proven performance in critical service is needed. * It provides the required strength with a good safety margin for the design conditions. **Consider a higher strength grade (A516 Grade 60/65/70) when:** Higher design pressures require greater allowable stress to reduce wall thickness and weight. --- **Disclaimer:** This technical summary is for informational purposes. For all engineering and fabrication, consult the latest **ASTM A516/A516M** specification, the applicable pressure vessel design code, and project-specific requirements. The minimum Charpy impact energy and corresponding test temperature **must be explicitly specified on the purchase order**. Properties are thickness-dependent. -:- For detailed product information, please contact sales. -: ASTM A516, Grade 55 Specification Dimensions Size： Diameter 20-1000 mm Length <7387 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 A516, Grade 55 Properties -:- For detailed product information, please contact sales. -:

Spherical ASTM A516, Grade 55 Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical ASTM A516, Grade 55 -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of ASTM A516, Grade 55 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A516, Grade 55 -:- For detailed product information, please contact sales. -:

Packing of ASTM A516, Grade 55 -:- 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 Spherical Powder 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 3858 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