ASTM A387 Alloy Steel, grade 22, Chromium Molybdenum

ASTM A387 Alloy Steel, grade 22, Chromium Molybdenum Product Information -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, grade 22, Chromium Molybdenum Synonyms -:- For detailed product information, please contact sales. -:

ASTM A387 Alloy Steel, grade 22, Chromium Molybdenum Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A387 / ASME SA-387 Grade 22 Alloy Steel Plate** **Product Overview** ASTM A387 Grade 22 is a high-performance **chromium-molybdenum (Cr-Mo) low-alloy steel plate** specifically engineered for **pressure vessels and critical structural components** operating under **extreme elevated temperature and pressure conditions**. With a nominal composition of 2.25% chromium and 1% molybdenum, this grade offers superior **creep strength, oxidation resistance, and resistance to high-temperature hydrogen attack (HTHA)** compared to lower-alloy grades (e.g., Grade 11, 12). It is a cornerstone material for the most demanding applications in petrochemical refining, power generation, and chemical processing, where service temperatures can reach up to 1150°F (621°C). The standard defines two classes to accommodate different fabrication and strength requirements. **Key International Standards** * **Primary Standard:** **ASTM A387 / A387M** - Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum. * **Governing Specification:** This product conforms to the requirements for **Grade 22** within ASTM A387. * **ASME Designation:** **SA-387 Grade 22** - The mandatory ASME Boiler and Pressure Vessel Code (BPVC) designation. * **Commercial Designation:** Often referred to as **2¼Cr-1Mo steel**. * **Heat Treatment Classes:** The grade is subdivided to define the delivery condition: * **Class 1:** Supplied in the **annealed or normalized and tempered** condition for maximum formability. * **Class 2:** Supplied in the **normalized and tempered or quenched and tempered** condition for higher strength. * **Related Standards:** Directly comparable to **ASTM A213 T22** for tubing, **ASTM A335 P22** for pipe, and international grades like **EN 10028-2 10CrMo9-10**. **Chemical Composition (Weight % - ASTM A387 Grade 22 Requirements)** | Element | ASTM A387 Grade 22 Requirement | Typical Range / Aim | | :--- | :--- | :--- | | **Carbon (C)** | 0.05 - 0.15% | 0.10 - 0.14% | | **Manganese (Mn)** | 0.30 - 0.60% | 0.40 - 0.55% | | **Phosphorus (P)** | 0.035% max | ≤ 0.015% | | **Sulfur (S)** | 0.035% max | ≤ 0.010% | | **Silicon (Si)** | 0.50% max | 0.25 - 0.45% | | **Chromium (Cr)** | **2.00 - 2.50%** | 2.00 - 2.30% | | **Molybdenum (Mo)** | **0.90 - 1.10%** | 0.90 - 1.05% | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.45 - 0.55 | **Physical & Mechanical Properties** *Properties vary depending on the specified Class (1 or 2) and thickness.* | Property | Requirement (Grade 22, Class 2 - Normalized & Tempered) | Typical Performance / Notes | | :--- | :--- | :--- | | **Tensile Strength** | 60 - 85 ksi (415 - 585 MPa) | 65 - 80 ksi (448 - 552 MPa) | | **Yield Strength (0.2% Offset)** | 30 ksi (205 MPa) min | 35 - 45 ksi (241 - 310 MPa) | | **Elongation in 2" (Min)** | 20% (for plates ≤ 3/4") | 20-25% | | **Charpy V-Notch Toughness** | Often specified by purchaser. | Must be heat-treated properly to achieve adequate toughness. Not a low-temperature material. | | **Maximum Recommended Metal Temp.** | -- | **Up to ~1150°F (621°C)** for prolonged service. Offers excellent creep rupture strength and oxidation resistance in this range. | | **Key Feature** | **Premium 2.25Cr-1Mo High-Temperature Plate:** The industry standard for heavy-wall pressure vessels in severe high-temperature/high-pressure hydrogen service, offering an unmatched balance of long-term creep strength, environmental resistance, and fabricability. | **Product Applications** ASTM A387 Grade 22 plate is specified for the most critical pressure-containing components in severe service environments. * **Hydroprocessing Reactors:** Primary material for **hydrocracker** and **hydrotreater** reactors in refineries, where resistance to HTHA is critical. * **High-Temperature / High-Pressure Heat Exchanger Shells.** * **Catalytic Reformer Reactors and Intermediates.** * **Power Boiler Drums and Headers** for advanced supercritical steam cycles. * **Synthesis Gas (Syngas) and Methanol Converters.** * **High-Temperature Piping and Pressure Vessels** in coal gasification and chemical plants. **Advantages & Fabrication Notes** * **Critical Fabrication with High Risk of Reheat Cracking:** Fabrication of Grade 22 is highly specialized and demands extreme control. It is notorious for its susceptibility to **reheat cracking** in the heat-affected zone (HAZ). * **Preheat:** Mandatory and high, typically **450-600°F (232-316°C)**. * **Low-Hydrogen Practice:** Essential (use of AWS E9018-B3/B3L electrodes). * **Post-Weld Heat Treatment (PWHT):** **Always required.** Standard range is **1250-1350°F (677-732°C)**. **The most critical step is controlled, very slow cooling (often ≤ 100°F/hr / 56°C/hr) through the 1200-800°F (649-427°C) range to mitigate reheat cracking.** * **Intermediate Stress Relief (ISR):** Often performed during fabrication of thick vessels to reduce residual stress before final PWHT. * **Superior Resistance to HTHA:** Its position on the **API RP 941 (Nelson) Curves** provides excellent resistance to hydrogen attack at high temperatures and pressures, making it the default choice for many refinery reactor vessels. * **Excellent Creep and Oxidation Resistance:** Provides long-term structural integrity under sustained high stress and temperature. * **Formability:** **Class 1** material is used for severe cold forming. Hot forming is common but must be followed by a full normalizing and tempering heat treatment. * **Code Compliance:** Fully recognized in the **ASME BPVC, Section II, Part D** with published allowable stresses up to 1150°F (621°C). **Disclaimer:** This datasheet provides general information on **ASTM A387 Grade 22 / SA-387 Grade 22**. Procurement specifications must unambiguously state the **Grade (22) and Class (1 or 2)**, heat treatment, and all supplementary requirements (impact testing, UT, PWHT parameters). **Design must use ASME BPVC allowable stress values.** Welding and PWHT of Grade 22 are among the most critical operations in pressure vessel fabrication; procedures **must be qualified per ASME Section IX** with great care. **Reheat cracking is a severe, well-known risk;** fabrication must be planned and executed by shops with proven expertise in 2.25Cr-1Mo steels. For hydrogen service, a **formal HTHA assessment per API RP 941 is mandatory**. Engineering oversight by specialists in high-temperature materials is essential throughout the project lifecycle. -:- For detailed product information, please contact sales. -: ASTM A387 Alloy Steel, grade 22, Chromium Molybdenum Specification Dimensions Size： Diameter 20-1000 mm Length <4705 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 22, Chromium Molybdenum Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A387 Alloy Steel, grade 22, Chromium Molybdenum -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A387 Alloy Steel, grade 22, Chromium Molybdenum -:- For detailed product information, please contact sales. -:

Packing of ASTM A387 Alloy Steel, grade 22, 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 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 1176 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