ASTM A387 Grade 22 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate used for welded boilers and pressure vessels in high-temperature service, offering good strength and corrosion resistance due to its ~2.25% Chromium and ~1% Molybdenum content, with Class 1 representing the standard tensile strength level for such applications.
Tensile Requirements for ASTM A387 Grade 22 Alloy Steel Plates Class 1 Plates
| Designation: | Requirement: | Grade 22 |
| A387 Grade 22 | Tensile strength, ksi [MPA] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 45 [310] | |
| Elongation in 8 in. [200mm], min % | ... | |
| Elongation in 2 in. [50mm], min, % | 18 | |
| Reduction of area, min % | 45 (measured on round specimen) 40 (measured on flat specimen) |
Chemical Requirements for ASTM A387 Grade 22 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| A387 Grade 22 | ||
| Carbon: | Heat Analysis: | 0.05 - 0.15 |
| Product Analysis: | 0.04 - 0.15 | |
| Manganese: | Heat Analysis: | 0.30 - 0.60 |
| Product Analysis: | 0.25 - 0.66 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Heat Analysis: | 0.50 max |
| Product Analysis: | 0.50 max | |
| Chromium: | Heat Analysis: | 2.00 - 2.50 |
| Product Analysis: | 1.88 - 2.62 | |
| Molybdenum: | Heat Analysis: | 0.90 - 1.10 |
| Product Analysis: | 0.85 - 1.15 |
applications
Oil and Gas Industry: Used for hydrogenation reactors, key components of desulfurization units, sour gas treatment equipment, as well as storage vessels and pressure pipelines for crude oil distillation. It can withstand hydrogen sulfide corrosion and high-pressure environments.
Power Industry: Suitable for steam drums and headers of thermal power boilers, high-temperature steam pipelines, medium-temperature section pressure vessel components in nuclear power plants, and key pressure-bearing structures such as turbine casings in combined cycle power plants.
Chemical and Coal Chemical Industry: Manufactures reactors for polymerization, alkylation and other reaction processes, pipelines and storage tanks for acid-alkali solution transportation, as well as shells and tube sheets of synthesis towers, separators and various heat exchangers.
General Boiler and Heat Exchange Equipment: Applied to pressure-bearing components of industrial boilers and heavy-duty heat exchangers, capable of resisting thermal fatigue and corrosion caused by long-term high-temperature combustion.
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What is A387 grade 22 material?
Chrome Molybdenum Steel – ASTM A387 Grade 22 Class 2. The A387 Grade 22 Class 2 – a grade of chromium-molybdenum alloy – is mainly intended for use in pressure vessels and welded boilers, which are designed for use in elevated temperature service.
What is ASTM A387?
A high quality chrome molybdenum alloy steel plate intended specifically for use in weldable carbon steel pressure vessels at elevated temperatures. Added molybdenum gives the material greater temperature tensile strength and the chromium provides improved corrosion resistance.