ASTM A699 Steel Sheet,Plate, class 3

ASTM A699 Steel Sheet/Plate, class 3 Product Information -:- For detailed product information, please contact sales. -: ASTM A699 Steel Sheet/Plate, class 3 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A699 Steel, class 3 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A699 Steel, Class 3** **ASTM A699 Class 3** is a premium carbon steel plate representing the highest quality classification within the A699 specification, designed for the most demanding pressure vessel applications requiring exceptional low-temperature toughness and superior fracture resistance. This class provides the ultimate performance in cryogenic service conditions where maximum safety and reliability are paramount. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A699/A699M** - "Standard Specification for Steel Plates, Carbon, for Pressure Vessels, Improved Transition Properties" **Classification:** - **Class 3** - Ultra-high impact properties with the most stringent requirements - **Class 2** - Enhanced impact properties - **Class 1** - Standard impact properties **International Equivalents:** - **EN 10028-3**: P275NL2 - **JIS G3115**: SGV 410 - **GB/T 3531**: 16MnDR - **ISO 9328-2**: P275NL2 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A699 Class 3: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.18 | | Manganese (Mn) | 0.70-1.00 | | Phosphorus (P) | 0.025 | | Sulfur (S) | 0.025 | | Silicon (Si) | 0.15-0.40 | | Copper (Cu) | 0.35 (when specified) | **Key Composition Features:** - **Ultra-Low Carbon**: Maximum 0.18% for superior toughness - **Extra-Tight Impurity Control**: Significantly reduced phosphorus and sulfur - **Precise Manganese**: Optimized range for balanced properties - **Enhanced Purity**: Highest level of chemical control in the A699 series --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses up to 2 inches/50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 450-530 MPa (65-77 ksi) | | **Yield Strength (min.)** | 275 MPa (40 ksi) | | **Elongation in 2" (min.)** | 26% | | **Elongation in 8" (min.)** | 29% | **Ultra-High Impact Toughness Properties:** - **Charpy V-Notch Test Temperature**: -100°F (-73°C) - **Minimum Impact Energy**: 30 ft-lbf (41 J) average - **Individual Minimum**: 25 ft-lbf (34 J) - **Most Stringent Requirements**: Superior to both Class 1 and Class 2 **Physical Properties:** - **Density**: 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Poisson's Ratio**: 0.29 - **Thermal Conductivity**: 50.8 W/m·K - **Coefficient of Thermal Expansion**: 11.5 × 10⁻⁶/°C --- #### **4. Product Applications** **Ultra-Low Temperature Pressure Vessels:** - Liquid hydrogen storage tanks - LNG storage at cryogenic temperatures - Liquid helium containment systems - Deep cryogenic research vessels **Aerospace and Advanced Technology:** - Space launch vehicle fuel tanks - Satellite propulsion systems - Aerospace cryogenic components - Advanced research equipment **Energy and Power:** - Hydrogen energy storage systems - Advanced LNG facilities - Cryogenic power generation equipment - Next-generation energy storage **Research and Development:** - Particle accelerator components - Nuclear research equipment - Advanced laboratory vessels - Scientific research cryostats **Specialized Industrial:** - Ultra-pure gas storage systems - Semiconductor manufacturing equipment - Pharmaceutical cryogenic vessels - Advanced materials processing --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Exceptional Weldability**: With strict procedure adherence - **Preheat Requirements**: 175-225°F (80-107°C) for all thicknesses - **Recommended Processes**: GTAW, GMAW with precise parameter control - **Filler Metals**: Premium low-hydrogen electrodes with strict certification **Forming & Machining:** - **Outstanding Formability**: Excellent for complex geometries - **Bend Radius**: Minimum 0.75t for 90° bends - **Machinability**: Very good (approximately 75% of B1112 steel) - **Surface Integrity**: Superior for critical applications **Heat Treatment:** - Supplied in normalized or controlled rolled condition - Strict thermal cycle control during fabrication - Comprehensive post-weld heat treatment protocols **Quality Assurance:** - **Enhanced Testing Protocol**: Multiple Charpy tests at -100°F (-73°C) - **Strict Certification**: Full traceability with extended documentation - **Advanced NDT**: Comprehensive ultrasonic and radiographic examination - **Microstructural Analysis**: Grain size and inclusion rating verification --- ### **Technical Summary** ASTM A699 Class 3 represents the pinnacle of carbon steel plate technology for pressure vessels operating in extreme cryogenic environments. With unmatched impact toughness properties tested at -100°F (-73°C) and the most stringent chemical composition controls in the A699 series, this classification provides the highest level of safety and performance for critical applications. The ultra-low carbon content and exceptionally tight control of impurities ensure superior fracture resistance and microstructural integrity. Class 3's enhanced elongation properties and certified ultra-low temperature impact values make it the material of choice for the most demanding cryogenic applications, including liquid hydrogen storage, aerospace systems, and advanced research equipment. While maintaining the fundamental strength characteristics of the A699 specification, Class 3 delivers unprecedented toughness performance, providing engineers with the ultimate safety margin for mission-critical applications. The material's exceptional fabrication characteristics, combined with rigorous quality assurance protocols, establish ASTM A699 Class 3 as the benchmark for carbon steel plates in ultra-low temperature pressure vessel service where absolute reliability is non-negotiable. -:- For detailed product information, please contact sales. -: ASTM A699 Steel, class 3 Specification Dimensions Size： Diameter 20-1000 mm Length <4313 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 A699 Steel, class 3 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A699 Steel Sheet,Plate, class 3 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A699 Steel Sheet,Plate, class 3 -:- For detailed product information, please contact sales. -:

Packing of ASTM A699 Steel Sheet/Plate, class 3 -:- 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 Sheet/Plate 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 784 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