ASTM A387 Alloy Steel Rod/Bar, Grade 12, Class 1

ASTM A387 Alloy Steel Rod, Grade 12, Class 1 Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel Rod, Grade 12, Class 1 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A387 Alloy Steel, Grade 12, Class 1 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A387 Grade 12 Class 1 Steel** **ASTM A387 Grade 12 Class 1** is a chromium-molybdenum alloy steel plate designed for pressure vessel applications requiring good elevated temperature strength and corrosion resistance. This specification covers plates in the annealed or normalized and tempered condition, suitable for welded pressure vessels operating at moderate to high temperatures. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A387/A387M** - "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum" **Grade Classification:** - **Grade 12** - 1.0% Chromium - 0.5% Molybdenum alloy steel - **Class 1** - Annealed or normalized and tempered condition **International Equivalents:** - **EN 10028-2**: 15CrMo5 - **JIS G4109**: SCMV 2 - **GB/T 3077**: 12CrMo - **ISO 9328-2**: 15CrMo5 --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A387 Grade 12: | 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) | 0.80-1.15 | | Molybdenum (Mo) | 0.45-0.60 | **Key Composition Features:** - **Chromium Content**: 0.80-1.15% for oxidation resistance - **Molybdenum Addition**: 0.45-0.60% for creep strength - **Controlled Carbon**: 0.05-0.17% for weldability and strength balance - **Silicon Enhancement**: 0.50-0.80% for deoxidation --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (Class 1 condition):** | Property | Value | |---|---| | **Tensile Strength** | 415-585 MPa (60-85 ksi) | | **Yield Strength (min.)** | 240 MPa (35 ksi) | | **Elongation in 2" (min.)** | 22% | | **Elongation in 8" (min.)** | 25% | **Elevated Temperature Properties:** - **Maximum Service Temperature**: Up to 565°C (1050°F) - **Creep Strength**: Good resistance to creep deformation - **Oxidation Resistance**: Improved over carbon steels - **Hydrogen Resistance**: Suitable for hydrogen service **Physical Properties:** - **Density**: 7.86 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Thermal Conductivity**: 48.0 W/m·K - **Coefficient of Thermal Expansion**: 11.8 × 10⁻⁶/°C - **Specific Heat Capacity**: 475 J/kg·K --- #### **4. Product Applications** **Pressure Vessel Applications:** - Medium temperature pressure vessels - Petrochemical reactors - Hydrogeneration equipment - Process industry vessels **Power Generation:** - Boiler components - Steam piping systems - Heat exchanger shells - Power plant pressure parts **Petrochemical Industry:** - Refinery equipment - Chemical process vessels - Hydrogenation units - Catalytic reactors **Industrial Applications:** - Industrial heating equipment - Thermal processing vessels - High-temperature manufacturing equipment - Process industry components --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: With proper procedure control - **Preheat Requirements**: 150-200°C (300-400°F) minimum - **Post-Weld Heat Treatment**: Mandatory at 675-705°C (1250-1300°F) - **Recommended Processes**: SMAW, GMAW, FCAW - **Filler Metals**: E8018-B2, ER80S-B2 or equivalent **Forming & Machining:** - **Good Formability**: Suitable for hot forming operations - **Machinability**: Fair (approximately 60% of B1112 steel) - **Cutting Methods**: Plasma, laser, and waterjet cutting - **Hot Working**: Preferred for complex shapes **Heat Treatment:** - Supplied in annealed or normalized and tempered condition - Normalizing temperature: 900-925°C (1650-1700°F) - Tempering temperature: 650-705°C (1200-1300°F) - Stress relieving: 675-705°C (1250-1300°F) **Quality Assurance:** - **Mandatory Testing**: Tensile and chemical analysis - **Impact Testing**: When specified by purchaser - **Hardness Testing**: Typically required - **Non-Destructive Testing**: As specified for pressure vessel applications --- ### **Technical Summary** ASTM A387 Grade 12 Class 1 is a versatile chromium-molybdenum alloy steel that provides an excellent balance of strength, ductility, and elevated temperature performance for pressure vessel applications. The 1% chromium and 0.5% molybdenum composition offers improved oxidation resistance and creep strength compared to carbon steels, while maintaining good fabrication characteristics. This grade is particularly suitable for applications operating in the temperature range of 315-565°C (600-1050°F), where carbon steels begin to lose significant strength but where higher alloy steels are not economically justified. The Class 1 condition ensures good ductility and toughness, making it suitable for welded construction and various fabrication processes. Grade 12 demonstrates reliable performance in hydrogen service and other corrosive environments encountered in petrochemical and refining applications. Its proven service history in power generation, chemical processing, and industrial heating applications has established it as a cost-effective solution for moderate temperature pressure vessel service where both mechanical performance and economic considerations are important factors in material selection. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, Grade 12, Class 1 Specification Dimensions Size： Diameter 20-1000 mm Length <4364 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 12, Class 1 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A387 Alloy Steel Rod, Grade 12, Class 1 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel Rod, Grade 12, Class 1 -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel Rod, Grade 12, Class 1 -:- 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 Rod 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 835 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