ASTM A387 Alloy Steel Wire, Grade 11, Class 2

ASTM A387 Alloy Steel Wire, Grade 11, Class 2 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel Wire, Grade 11, Class 2 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A387 Alloy Steel, Grade 11, Class 2 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387 Grade 11 Class 2 Steel** **ASTM A387 Grade 11 Class 2** is a chromium-molybdenum alloy steel plate supplied in the normalized and tempered condition for pressure vessel applications requiring higher strength at elevated temperatures. This class offers enhanced mechanical properties compared to Class 1 while maintaining good elevated temperature performance characteristics. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A387/A387M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum" **Grade Classification:** - **Grade 11** - 1.25% Chromium - 0.50% Molybdenum alloy steel - **Class 2** - Normalized and tempered condition **International Equivalents:** - **EN 10028-2**: 13CrMo4-5 - **JIS G4109**: SCMV 4 - **GB/T 3077**: 15CrMo - **ISO 9328-2**: 13CrMo4-5 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A387 Grade 11 Class 2: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.05-0.17 | | Manganese (Mn) | 0.40-0.65 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.035 | | Silicon (Si) | 0.50-0.80 | | Chromium (Cr) | 1.00-1.50 | | Molybdenum (Mo) | 0.45-0.65 | **Key Composition Features:** - **Chromium Content**: 1.00-1.50% for high-temperature oxidation resistance - **Molybdenum Enhancement**: 0.45-0.65% for creep strength and temper resistance - **Carbon Control**: 0.05-0.17% optimized for normalized and tempered condition - **Silicon Range**: 0.50-0.80% for deoxidation and solid solution strengthening --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (Class 2 condition):** | Property | Value | |---|---| | **Tensile Strength** | 515-690 MPa (75-100 ksi) | | **Yield Strength (min.)** | 310 MPa (45 ksi) | | **Elongation in 2" (min.)** | 20% | | **Elongation in 8" (min.)** | 22% | **Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 595°C (1100°F) - **Creep Strength**: Enhanced compared to Class 1 - **Oxidation Resistance**: Superior to carbon steels - **Temper Resistance**: Good stability at operating temperatures **Physical Properties:** - **Density**: 7.86 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 47.0 W/m·K - **Coefficient of Thermal Expansion**: 11.9 × 10⁻⁶/°C - **Specific Heat Capacity**: 468 J/kg·K --- #### **4. Product Applications** **High-Temperature Pressure Vessels:** - Power boiler components - High-pressure reactors - Petrochemical processing vessels - High-temperature heat exchangers **Power Generation Equipment:** - Steam drums and headers - High-pressure piping systems - Turbine components - Power plant pressure vessels **Petrochemical Industry:** - Hydroprocessing reactors - Catalytic reforming units - High-temperature separators - Refinery pressure equipment **Industrial Applications:** - High-temperature processing vessels - Thermal reactor systems - Industrial furnace components - High-pressure manufacturing equipment --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: Requires strict procedure control - **Preheat Requirements**: 175-225°C (350-450°F) minimum - **Post-Weld Heat Treatment**: Mandatory at 675-705°C (1250-1300°F) - **Recommended Processes**: GMAW, FCAW, SAW (low-hydrogen) - **Filler Metals**: E8018-B2, ER80S-B2 or equivalent **Forming & Machining:** - **Moderate Formability**: Hot forming recommended - **Machinability**: Fair to poor (approximately 50% of B1112 steel) - **Cutting Methods**: Plasma, waterjet, and laser cutting preferred - **Tooling Requirements**: Carbide tools recommended **Heat Treatment:** - Supplied in normalized and tempered condition - Normalizing temperature: 900-925°C (1650-1700°F) - Tempering temperature: 650-705°C (1200-1300°F) - Microstructure: Fine-grained bainitic structure **Quality Assurance:** - **Comprehensive Testing**: Tensile, chemical, and impact tests - **Hardness Verification**: Required for quality control - **Impact Testing**: Typically specified for pressure vessel applications - **Non-Destructive Testing**: UT, RT, MT as required --- ### **Technical Summary** ASTM A387 Grade 11 Class 2 represents an enhanced version of the chromium-molybdenum alloy steel, offering higher strength levels while maintaining excellent elevated temperature performance. The normalized and tempered condition provides a fine-grained microstructure that ensures optimal combination of strength, ductility, and toughness for demanding pressure vessel applications. With a minimum yield strength of 45 ksi (310 MPa), Class 2 offers approximately 30% higher strength than Class 1, allowing for more efficient vessel designs and material savings in high-pressure applications. The chromium-molybdenum alloy system provides reliable performance at temperatures up to 595°C (1100°F), with improved creep strength and oxidation resistance compared to carbon steels. While requiring more stringent fabrication controls, particularly in welding and heat treatment operations, Grade 11 Class 2 delivers superior performance in critical high-temperature pressure vessel applications. The material's proven service history in power generation and petrochemical industries has established it as a preferred choice for engineers designing equipment where both mechanical strength and elevated temperature capability are essential requirements. The enhanced properties of Class 2 make it particularly valuable for applications involving higher design pressures or where weight reduction is an important consideration, while maintaining the corrosion resistance and high-temperature stability characteristic of chromium-molybdenum alloys. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 11, Class 2 Specification Dimensions Size： Diameter 20-1000 mm Length <4363 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 A387 Alloy Steel, Grade 11, Class 2 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A387 Alloy Steel Wire, Grade 11, Class 2 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel Wire, Grade 11, Class 2 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel Wire, Grade 11, Class 2 -:- 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 Wire 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 834 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