Spherical ASTM A387 Alloy Steel Powder, grade 12, Chromium Molybdenum

ASTM A387 Alloy Steel Spherical Powder, grade 12, Chromium Molybdenum Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel Spherical Powder, grade 12, Chromium Molybdenum Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A387 Alloy Steel Powder, grade 12, Chromium Molybdenum characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A387 Alloy Steel Powder, grade 12, Chromium Molybdenum 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 ASTM A387 Alloy Steel Powder, grade 12, Chromium Molybdenum 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 ASTM A387 Alloy Steel Powder, grade 12, Chromium Molybdenum Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, grade 12, Chromium Molybdenum Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A387 Grade 12 Alloy Steel (Chromium-Molybdenum)** ASTM A387 Grade 12 is a standardized, chromium-molybdenum (Cr-Mo) alloy steel plate material specified for **pressure vessel and component fabrication** intended for elevated temperature service. It is a member of the A387 family, which governs pressure vessel plates made of heat-treated, alloy-steel, intended primarily for service in welded pressure vessels where improved properties are required at elevated temperatures. Grade 12, specifically, is designed to provide **enhanced strength, oxidation resistance, and creep resistance** compared to carbon steel plates, for applications typically up to **650°F (345°C) and beyond in certain conditions**. Unlike tubing specifications (A213/A209), A387 covers plates used for constructing shells, heads, and other major pressure-retaining components. Grade 12 offers a balanced composition that delivers **good weldability, formability, and stable mechanical properties at high temperatures**, making it a cornerstone material for fabricating heat exchangers, reactors, separators, and other critical pressure equipment in the power generation, petrochemical, and refining industries. --- ## **1. Chemical Composition (Weight %)** Grade 12 features a specific chromium and molybdenum balance designed for plate fabrication and elevated temperature service. | **Element** | **Carbon (C)** | **Manganese (Mn)** | **Phosphorus (P)** | **Sulfur (S)** | **Silicon (Si)** | **Chromium (Cr)** | **Molybdenum (Mo)** | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | 0.15 max | 0.30 - 0.80 | 0.035 max | 0.035 max | 0.15 - 0.40 | 0.80 - 1.25 | 0.44 - 0.65 | | **Role** | Provides base strength. Kept low to maximize weldability and toughness, especially in thicker sections. | Contributes to strength and hardenability; aids in deoxidation. | Impurity, kept low to preserve toughness. | Impurity, kept low to preserve weldability and formability. | Deoxidizer; contributes to strength and oxidation resistance. | **Primary alloy.** Enhances oxidation/corrosion resistance at high temperatures and improves hardenability. | **Key alloy.** Significantly increases elevated temperature strength (creep resistance) and hardenability. | *Note: Iron (Fe) constitutes the remainder. The composition is similar to that of tube grades like A213 T12, but as a plate specification, it has allowances for slightly higher impurities and a focus on properties in thicker cross-sections.* --- ## **2. Physical & Mechanical Properties** *Properties are guaranteed in the heat-treated (normalized and tempered) condition. The standard includes two classes: Class 1 (as-rolled) and Class 2 (normalized and tempered). Class 2 is more common for demanding applications.* * **Density:** ~7.87 g/cm³ (0.284 lb/in³) * **Modulus of Elasticity:** ~200-205 GPa (29-30 x 10⁶ psi) * **Thermal Conductivity:** ~45 W/m·K at 100°C. * **Coefficient of Thermal Expansion:** ~11.5 x 10⁻⁶/°C (20-100°C) * **Room Temperature Mechanical Properties (ASTM A387 Gr.12, Class 2 - Normalized & Tempered):** * **Tensile Strength:** 415 - 585 MPa (60,000 - 85,000 psi) * **Yield Strength:** 220 MPa min (32,000 psi min) * **Elongation:** 20% min (in 50 mm / 2 in gauge length) * **Elevated Temperature Performance:** * **Creep & Rupture Strength:** **Good.** The molybdenum content provides improved resistance to creep deformation compared to carbon steels at temperatures up to ~565°C (1050°F). * **Oxidation Resistance:** **Improved over carbon steel.** The ~1% chromium content offers better resistance to scaling in steam and oxidizing atmospheres. * **Toughness:** Good notch toughness in the normalized and tempered condition, suitable for pressure vessel construction. --- ## **3. Heat Treatment & Fabrication** Fabrication follows strict procedures due to the alloy's air-hardening tendency. * **Mill Heat Treatment (Class 2):** Supplied in the **Normalized and Tempered** condition. Normalizing (~900-950°C) refines the grain structure, and tempering (~650-730°C) provides the desired combination of strength and toughness. * **Hot Forming:** Can be performed, but the component must be re-normalized and tempered afterward if the forming temperature exceeds the original tempering temperature or significantly alters the microstructure. * **Cold Forming:** Permissible, but may require subsequent stress relief. * **Welding:** **Requires strict procedure control.** * **Preheat:** Mandatory, typically **150-200°C (300-400°F)** minimum to prevent hydrogen-induced cracking (HIC). * **Interpass Temperature:** Controlled to a similar range. * **Post-Weld Heat Treatment (PWHT):** **Mandatory.** Essential to temper the heat-affected zone (HAZ), relieve residual stresses, and restore corrosion resistance. Standard range: **620-700°C (1150-1300°F)**. Hold time is based on thickness. * **Filler Metal:** Typically AWS A5.5 E80xx-B2 (e.g., E8018-B2) for SMAW or AWS A5.28 ER80S-B2 for GTAW/GMAW. * **Stress Relieving:** Required after severe cold forming. --- ## **4. Key Applications** ASTM A387 Gr.12 is a fundamental material for constructing welded pressure vessels operating at elevated temperatures. * **Pressure Vessels:** Shells, heads, and nozzles for reactors, separators, and columns in refineries and chemical plants. * **Heat Exchangers & Boiler Drums:** For shell and tube heat exchangers, steam drums, and other heat transfer equipment. * **Hydrogen Service Vessels:** Commonly used in moderate-temperature hydrogen environments due to its resistance to hydrogen attack at appropriate temperatures/pressures (refer to Nelson Curves). * **Catalytic Reactor Vessels.** * **High-Temperature Storage Tanks.** --- ## **5. International Standards & Cross-References** A387 Gr.12 is the plate equivalent of other 1Cr-0.5Mo alloy forms. * **ASTM:** **A387/A387M - Grade 12, Class 2** * **ASME:** **SA-387 Gr.12, Cl.2** (Accepted for ASME Boiler & Pressure Vessel Code, Section VIII, Div. 1). * **EN (European):** **EN 10028-2 - 13CrMo4-5** is the direct plate equivalent. * **DIN (German):** **13CrMo4-5**. * **JIS (Japanese):** **SCMV 2** or **SLA 24A**. * **ISO:** **ISO 9328-2: P12**. * **UNS:** **K11762** * **Common Name:** **1.25Cr-0.5Mo Steel Plate**. --- ## **6. Advantages & Limitations** **Advantages:** * **Improved High-Temperature Properties:** Offers better strength and oxidation resistance than carbon steel plates for pressure vessel applications. * **Good Weldability & Formability:** When proper procedures are followed, it is a reliable and fabricable material. * **Cost-Effective for Moderate Service:** Provides a performance upgrade over carbon steel without the cost of higher-alloy steels (e.g., Grade 22). * **Standardized & Proven:** Extensive history in industrial applications with well-established design and fabrication codes. **Limitations:** * **Stringent Welding Requirements:** Mandatory preheat, interpass control, and PWHT increase fabrication complexity and cost. * **Air-Hardening Tendency:** Risk of HAZ cracking if welding procedures are not strictly adhered to. * **Limited High-Temperature Capability:** For temperatures significantly above ~565°C, higher alloy grades (Gr.11, Gr.22, Gr.91) are required. * **Not for Severe Corrosion:** Chromium content is insufficient for highly corrosive environments; stainless or clad materials may be needed. --- ## **7. Summary** **ASTM A387 Grade 12 is a classic and indispensable chromium-molybdenum alloy steel plate for the construction of reliable, code-compliant pressure vessels operating at elevated temperatures.** It represents a critical material selection for engineers designing equipment that must safely contain pressure in the challenging thermal environments of the process and power industries. By specifying Grade 12 in the normalized and tempered condition (Class 2), fabricators achieve an optimal balance of strength, toughness, and stability, ensuring long-term service integrity. Its successful application is a testament to rigorous procedural control, making it a trusted and fundamental choice for heavy industrial pressure equipment. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, grade 12, Chromium Molybdenum Specification Dimensions Size： Diameter 20-1000 mm Length <7008 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, Chromium Molybdenum Properties -:- For detailed product information, please contact sales. -:

Spherical ASTM A387 Alloy Steel Powder, grade 12, Chromium Molybdenum Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical ASTM A387 Alloy Steel Powder, grade 12, Chromium Molybdenum -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of ASTM A387 Alloy Steel Spherical Powder, grade 12, Chromium Molybdenum -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel Spherical Powder, grade 12, Chromium Molybdenum -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel Spherical Powder, grade 12, Chromium Molybdenum -:- 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 3479 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