Spherical EN SPHL275 High Manganese Pressure Vessel Carbon Steel Powder

EN SPHL275 High Manganese Pressure Vessel Carbon Steel Spherical Powder Product Information -:- For detailed product information, please contact sales. -: EN SPHL275 High Manganese Pressure Vessel Carbon Steel Spherical Powder Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical EN SPHL275 High Manganese Pressure Vessel Carbon Steel Powder characteristics -:- For detailed product information, please contact sales. -: Spherical EN SPHL275 High Manganese Pressure Vessel Carbon Steel Powder 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 EN SPHL275 High Manganese Pressure Vessel Carbon Steel Powder 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 EN SPHL275 High Manganese Pressure Vessel Carbon Steel Powder Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: EN SPHL275 High Manganese Pressure Vessel Carbon Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Name:** EN SPHL275 High Manganese Pressure Vessel Carbon Steel **Classification:** Low Temperature Fine-Grain Steel Plate for Spherical Gas Tanks --- ### **1. Overview** EN SPHL275 is a specialized **hot-rolled fine-grain structural steel** plate designed and manufactured explicitly for the construction of **spherical storage tanks** that operate at **low temperatures**. The designation "SPH" indicates its application for **Spherical** tanks, "L" signifies its suitability for **Low-temperature** service, and "275" denotes its **minimum yield strength in MPa**. This grade represents a critical evolution in materials for cryogenic storage, offering enhanced strength and guaranteed low-temperature toughness compared to basic grades like SPH235. It is engineered to ensure the utmost safety and integrity of large-scale spherical vessels storing liquefied gases, where resistance to brittle fracture under extreme cold is paramount. ### **2. Chemical Composition (Weight %, ladle analysis)** The chemical composition is tightly controlled per **EN 10225:2019** and related standards for offshore steels (S355 category), with specific modifications for low-temperature toughness. | Element | Minimum (%) | Maximum (%) | Notes | |---------|------------|------------|-------| | **Carbon (C)** | - | 0.16 | **Very low carbon content** is crucial for superior low-temperature toughness and excellent weldability. | | **Silicon (Si)** | - | 0.50 | Deoxidizing agent. Lower content is often targeted to maximize toughness. | | **Manganese (Mn)** | 1.20 | 1.70 | **High Manganese content** is a defining feature. It significantly enhances strength through solid solution strengthening while concurrently improving low-temperature toughness and hardenability. | | **Phosphorus (P)** | - | 0.020 | Stringently limited, as it severely embrittles steel at low temperatures. | | **Sulfur (S)** | - | 0.010 | Very low to minimize sulfide inclusions, which can act as crack initiation sites, and improve weldability. | | **Aluminum, total (Alt)** | 0.015 | - | Essential grain refiner. Ensures a fine ferritic grain structure, which is critical for achieving good low-temperature impact properties. | | **Nitrogen (N)** | - | 0.018 | Tightly controlled. | | **Niobium (Nb)** | - | 0.05 | **Micro-alloying element.** Added primarily for grain refinement and precipitation strengthening, contributing to both strength and toughness. | | **Vanadium (V)** | - | 0.08 | May be used in combination with Nb for micro-alloying effects. | | **Carbon Equivalent (CEV)** | - | ≤ 0.42 (typical) | **Low CEV** ensures excellent weldability, minimizing the need for complex pre-heat procedures and reducing the risk of hydrogen-induced cracking (HIC) and cold cracking. | **Note:** The precise balance of Mn, micro-alloys (Nb, V), and low impurity elements (P, S) is meticulously optimized by steelmakers to guarantee the mandatory low-temperature Charpy V-notch impact values. ### **3. Physical & Mechanical Properties** *Properties are typically achieved through a controlled rolling or normalizing heat treatment process.* **Mechanical Properties (Typical & Minimum):** * **Yield Strength (ReH, min):** 275 MPa * **Tensile Strength (Rm):** 400 - 550 MPa * **Yield-to-Tensile Ratio (ReH/Rm):** ≤ 0.85 – Indicates good strain hardening capacity and ductile failure mode. * **Elongation (A, min on 5.65√S₀):** ≥ 22% (longitudinal) * **Impact Energy (KV):** This is the **most critical property** for SPHL275. * **Test Temperature:** Typically specified at **-50°C** or lower (common for LNG, ethylene, etc.). Can be certified for -60°C or -70°C based on project requirements. * **Minimum Average (Longitudinal & Transverse):** Often **≥ 60 J** or higher at the specified temperature, with strict minimum single values (e.g., ≥ 40 J). * **Hardness (typical):** 130 - 160 HBW **Physical Properties (Typical):** * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** 210 GPa * **Poisson's Ratio:** 0.3 * **Thermal Conductivity:** ~ 50 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** ~ 11 x 10⁻⁶ /K (20-100°C) ### **4. Key Characteristics** * **Exceptional Low-Temperature Toughness:** Engineered to maintain high fracture toughness and ductility at temperatures as low as -50°C to -70°C, preventing brittle fracture. * **High Manganese Advantage:** The elevated Mn content (1.2-1.7%) provides an optimal combination of increased strength without compromising toughness, unlike carbon which tends to embrittle. * **Fine-Grain Structure:** Achieved through Al/Nb treatment and controlled processing, it is the primary metallurgical factor for superior low-temperature performance. * **Excellent Weldability:** The low carbon and low CEV allow for reliable welding under field conditions. However, strict control of welding heat input and the use of approved, tough welding consumables are mandatory. * **Good Cold Formability:** Suitable for the heavy cold pressing required to form spherical "petals," thanks to its good ductility. ### **5. Product Applications** SPHL275 is the material of choice for demanding low-temperature spherical storage applications: * **Spherical Tanks for Liquefied Gases:** * **Liquefied Natural Gas (LNG)** - Primary storage spheres (at temperatures down to -162°C; inner tanks use 9% Ni steel or aluminum, but outer support structures or secondary spheres may use SPHL275 for slightly warmer services). * **Liquefied Ethylene (LEG)** - Typical storage at approx. -104°C. * **Liquefied Petroleum Gas (LPG)** - For enhanced safety in colder climates or where specifications demand higher toughness. * **Liquid Ammonia, Propylene, and other Industrial Gases** stored at sub-zero temperatures. * **Other Critical Low-Temperature Structures:** Components in cold boxes, large cryogenic piping supports, and other infrastructure exposed to low temperatures in petrochemical plants. ### **6. International Standards & Specifications** SPHL275 is a well-established grade within European and global engineering standards for low-temperature applications. | Region | Standard & Designation | Scope / Notes | |--------|----------------------|---------------| | **European Union** | **EN 10225:2019** | Weldable structural steels for fixed offshore structures. SPHL275 is a specific quality within the **S355** grade family, tailored for low-temperature spherical tanks. | | **Germany** | **SEW 087 (Historical Guidance)** | Technical delivery conditions for fine-grain structural steels for low-temperature service. Provides background on material philosophy. | | **Japan** | **JIS G3126 SLA 325A/B** | A direct functional equivalent for low-temperature pressure vessel steels, with similar strength and toughness levels. | | **USA / ASTM** | **ASTM A537 Class 2** | A normalized carbon-manganese-silicon steel plate with excellent low-temperature properties, often considered a non-identical but comparable alternative for similar applications. | | **China** | **GB 3531** | Standard for low-temperature pressure vessel steel plates. Grades like **16MnDR** are comparable in strength and low-temperature application philosophy. | | **Project Specifications** | **Major Energy Company Specs (e.g., Shell DEP, ExxonMobil)** | Frequently specify SPHL275 or its equivalent with additional stringent requirements on chemistry, toughness (CTOD testing), and NDT. | ### **7. Available Forms & Processing** * **Standard Forms:** Supplied exclusively as **hot-rolled steel plates** in heavy gauges and large widths. * **Condition:** Usually supplied in the **normalized (N)** or **thermomechanically controlled processed (TMCP)** condition to guarantee the fine austenite grain size and resultant toughness. * **Fabrication:** * **Cold Forming:** Plates are cold-pressed into precise spherical curvatures. * **Welding:** Requires qualified Welding Procedure Specifications (WPS) using low-hydrogen, high-nickel (for toughness matching) electrodes and wires (e.g., classifications per EN ISO 18276-A). Strict pre-heat and interpass temperature control are essential. * **Post-Weld Heat Treatment (PWHT):** Almost always required for final stress relief to ensure dimensional stability and eliminate residual stresses. --- **Disclaimer:** This technical summary is for informational purposes. For actual project procurement, fabrication, and construction, adherence to the specific **Project Purchase Specification** is mandatory. This specification will detail the exact required standard (e.g., EN 10225 with specific supplementary requirements), the **design minimum temperature**, the required **Charpy impact energy values at that temperature**, and any additional testing (e.g., CTOD, HIC testing). All fabrication must comply with the relevant pressure vessel design code (e.g., EN 13445, ASME Section VIII Div. 2). -:- For detailed product information, please contact sales. -: EN SPHL275 High Manganese Pressure Vessel Carbon Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7383 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. -: EN SPHL275 High Manganese Pressure Vessel Carbon Steel Properties -:- For detailed product information, please contact sales. -:

Spherical EN SPHL275 High Manganese Pressure Vessel Carbon Steel Powder Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical EN SPHL275 High Manganese Pressure Vessel Carbon Steel Powder -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of EN SPHL275 High Manganese Pressure Vessel Carbon Steel Spherical Powder -:- For detailed product information, please contact sales. -: Chemical Identifiers EN SPHL275 High Manganese Pressure Vessel Carbon Steel Spherical Powder -:- For detailed product information, please contact sales. -:

Packing of EN SPHL275 High Manganese Pressure Vessel Carbon Steel Spherical Powder -:- 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 3854 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