Spherical EN SPH235 High Manganese Pressure Vessel Carbon Steel Powder

EN SPH235 High Manganese Pressure Vessel Carbon Steel Spherical Powder Product Information -:- For detailed product information, please contact sales. -: EN SPH235 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 SPH235 High Manganese Pressure Vessel Carbon Steel Powder characteristics -:- For detailed product information, please contact sales. -: Spherical EN SPH235 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 SPH235 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 SPH235 High Manganese Pressure Vessel Carbon Steel Powder Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: EN SPH235 High Manganese Pressure Vessel Carbon Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Name:** EN SPH235 High Manganese Pressure Vessel Carbon Steel **Classification:** Hot Rolled Steel Plate for Spherical Gas Tanks --- ### **1. Overview** EN SPH235 is a specialized **hot-rolled steel plate** specifically designed and standardized for the construction of **spherical gas holders and tanks** (commonly known as "gas spheres"). Unlike standard pressure vessel steels categorized under EN 10028-2/3, SPH235 falls under a dedicated product standard, **EN 10225**, which outlines requirements for weldable structural steels for fixed offshore structures. However, its primary and most iconic application is in the fabrication of large, spherical pressure vessels used for storing gases under pressure. The "SPH" prefix stands for **Spherical**, and "235" indicates its **minimum yield strength in MPa**. Its key characteristic is an optimized balance of moderate strength, excellent notch toughness at low temperatures, and superior weldability to ensure the structural integrity of these critical storage facilities. ### **2. Chemical Composition (Weight %, ladle analysis)** Composition is specified per **EN 10225:2019** for S355 series offshore steels, with SPH235 meeting the specific requirements for spherical tanks. | Element | Minimum (%) | Maximum (%) | Notes | |---------|------------|------------|-------| | **Carbon (C)** | - | 0.18 | Low carbon content is critical for excellent weldability and cold formability. | | **Silicon (Si)** | - | 0.50 | Used for deoxidation. | | **Manganese (Mn)** | 0.90 | 1.60 | **High Mn** relative to carbon. Provides solid solution strengthening and improves toughness. | | **Phosphorus (P)** | - | 0.030 | Low to ensure good toughness. | | **Sulfur (S)** | - | 0.025 | Controlled to minimize hot shortness and improve weldability. | | **Aluminum, total (Alt)** | 0.015 | - | Grain refining agent, ensures fine grain structure. | | **Nitrogen (N)** | - | 0.020 | Controlled. | | **Niobium (Nb)** | - | 0.05 | May be added for micro-alloying to refine grains and increase strength. | | **Vanadium (V)** | - | 0.10 | May be added in combination with Nb for precipitation strengthening. | | **Carbon Equivalent (CEV)** | - | ≤ 0.40 (typical) | **Very low CEV**, indicating **excellent weldability** with minimal risk of cold cracking, even under field erection conditions. | **Note:** The exact composition is tightly controlled by steelmakers to achieve the mandatory impact toughness properties, often making SPH235 cleaner and more refined than generic structural steels of similar strength. ### **3. Physical & Mechanical Properties** *Properties are for hot-rolled or normalized condition, as specified.* **Mechanical Properties (Typical & Minimum):** * **Yield Strength (ReH, min):** 235 MPa * **Tensile Strength (Rm):** 360 - 510 MPa * **Yield-to-Tensile Ratio (ReH/Rm):** ≤ 0.85 (typical) – Ensures good deformation capacity before failure. * **Elongation (A, min on 5.65√S₀):** ≥ 22% (longitudinal) * **Impact Energy (KV, min):** This is a **critical property**. For spherical tanks, requirements are stringent. * **Test Temperature:** Typically **-20°C** or lower (e.g., -30°C, -40°C) based on design operating temperature. * **Minimum Average (Longitudinal & Transverse):** Often **≥ 40 J** at the specified temperature, with high single-value requirements. * **Hardness (typical):** 120 - 150 HBW **Physical Properties (Typical):** * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** 210 GPa * **Poisson's Ratio:** 0.3 * **Thermal Conductivity:** ~ 52 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** ~ 11 x 10⁻⁶ /K (20-100°C) ### **4. Key Characteristics** * **Excellent Low-Temperature Toughness:** The most critical feature. Designed to resist brittle fracture under cyclic loading and at the low operating temperatures often encountered by stored gases (e.g., LPG, nitrogen, oxygen). * **Superior Weldability:** Extremely low carbon equivalent allows for easy welding in all positions, often without pre-heat for moderate thicknesses, which is vital for the extensive field welding of spherical segments. * **Good Cold Formability:** Can be cold-pressed into the complex spherical and curvilinear shapes (petals) required for sphere construction without cracking. * **Consistent Quality:** Produced with internal cleanliness and homogeneity to ensure uniform properties across large plate areas. * **Moderate Strength:** The 235 MPa yield strength is optimized for the membrane stress state in large spherical vessels, allowing for ductile behavior and stress redistribution. ### **5. Product Applications** The application of SPH235 is highly specialized: * **Spherical Gas Holders/Tanks:** The **primary and defining application**. Used for storing: * Liquefied Petroleum Gas (LPG: propane, butane) * Industrial Gases (oxygen, nitrogen, argon) * City Gas * Blast Furnace Gas in steel plants * **Other Critical Storage Structures:** May be specified for other types of large, welded storage tanks where low-temperature toughness is paramount. * **Offshore Structures:** As per its parent standard (EN 10225), it can be used in secondary structures of fixed offshore platforms where S355 grade steel with good toughness is required. ### **6. International Standards & Specifications** SPH235 is rooted in European standards but is recognized globally for sphere construction. | Region | Standard & Designation | Scope / Notes | |--------|----------------------|---------------| | **European Union** | **EN 10225:2019** | Weldable structural steels for fixed offshore structures. SPH235 is a specific quality within the **S355** grade classification for spherical tanks. | | **European Union** | **EN 10029** | Specification for hot-rolled steel plates 3 mm thick or above (dimensional tolerances). | | **Germany** | **DIN 17100-2 (Historic)** | Formerly known as **St 52-3 N** for spherical tanks. | | **Japan / International** | **JIS G3116 SG 255** | A closely comparable grade for gas spheres, though JIS grades may have slightly different chemistry/toughness requirements. | | **China** | **GB 19189** | Standard for steel plates for spherical gas tanks. Grades like **07MnNiMoVDR** are higher-strength equivalents, while SPH235's closest counterpart would be in the lower strength class. | | **Project Specifications** | **Owner/Operator Specs (e.g., Shell, ExxonMobil)** | Often reference EN 10225/SPH235 or provide proprietary specifications with equivalent or enhanced requirements. | ### **7. Available Forms & Processing** * **Standard Forms:** Exclusively supplied as **hot-rolled steel plates** in wide and heavy dimensions to fabricate the "petals" of the sphere. * **Condition:** Typically supplied in the **hot-rolled (AR)** or **normalized (N)** condition to achieve the required toughness. * **Fabrication:** * **Cold Forming/Pressing:** Plates are precision cut and cold-pressed into spherical curves using large dies. * **Welding:** Submerged Arc Welding (SAW) is predominant for site assembly. Manual Metal Arc (MMA) and Gas Metal Arc Welding (GMAW) are also used. Matching low-hydrogen, high-toughness filler metals are mandatory. * **Post-Weld Heat Treatment (PWHT):** Local or full PWHT is often performed to relieve welding stresses. ### **8. Why SPH235 for Spheres?** The choice of SPH235 is driven by engineering principles for spherical pressure vessels: the spherical shape minimizes stress concentration, so very high strength is not the primary need. Instead, **resistance to brittle fracture, exceptional weld integrity, and the ability to withstand low temperatures and cyclic pressure loads** are paramount. SPH235 is engineered precisely for this holistic performance requirement, making it the traditional and trusted material for this iconic application worldwide. --- **Disclaimer:** This document is a technical summary. For procurement and construction, the project must be governed by the specific **Purchase Order Technical Specification**, which will reference **EN 10225** and any additional project-specific requirements (e.g., stricter toughness at lower temperatures, enhanced NDT). Always adhere to the applicable pressure vessel design code (e.g., EN 13445, ASME Section VIII) and welding procedure specifications (WPS). -:- For detailed product information, please contact sales. -: EN SPH235 High Manganese Pressure Vessel Carbon Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7382 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 SPH235 High Manganese Pressure Vessel Carbon Steel Properties -:- For detailed product information, please contact sales. -:

Spherical EN SPH235 High Manganese Pressure Vessel Carbon Steel Powder Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical EN SPH235 High Manganese Pressure Vessel Carbon Steel Powder -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of EN SPH235 High Manganese Pressure Vessel Carbon Steel Spherical Powder -:- For detailed product information, please contact sales. -: Chemical Identifiers EN SPH235 High Manganese Pressure Vessel Carbon Steel Spherical Powder -:- For detailed product information, please contact sales. -:

Packing of EN SPH235 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 3853 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