ASTM A387 GRADE 22 CLASS 1 STEEL
Products Description ASTM A387 Grade 22 Class 1 steel is a highly specialized and significant material in industrial applications. It is characterized by unique properties and specifications that make it essential in multiple sectors. Its outstanding mechanical strength, with high tensile and...
Description
Products Description
Equivalents
| BS | EN | ASTM/ASME | DIN |
|---|---|---|---|
| 622-515B | 10CrMo910 | A/SA387-22-2 | 10CrMo910 |
Chromium & Molybdenum content
| Designation | Nominal Chromium Content (%) | Nominal Molybdenum Content (%) |
|---|---|---|
| A387 Grade 22 | 2.25% | 1.00% |
Tensile Requirements
| 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. [200 mm], min % | ||
| Elongation in 2 in. [50 mm], min, % | 18 | |
| Reduction of area, min % | 45 (measured on round specimen) 40 (measured on flat specimen) |
Chemical Requirements
| . | . |
|---|---|
| Carbon (C) | % |
| Heat Analysis: Product Analysis: |
0.05 - 0.15 0.04 - 0.15 |
| Manganese (Mn) | % |
| Heat Analysis: Product Analysis: |
0.30 - 0.60 0.25 - 0.66 |
| Phosphorus (P) | % |
| Heat Analysis: Product Analysis: |
0.035 0.035 |
| Sulphur (S) (Max) | % |
| Heat Analysis: Product Analysis: |
0.035 0.035 |
| Silicon (Si) | % |
| Heat Analysis: Product Analysis: |
0.50 max 0.50 max |
| Chromium (Cr) | % |
| Heat Analysis: Product Analysis: |
2.00 - 2.50 1.88 - 2.62 |
| Molybdenum (Mo) | % |
| Heat Analysis: Product Analysis: |
0.90 - 1.10 0.85 - 1.15 |
The precise chemical composition, typically including elements like chromium, molybdenum, and vanadium in specific proportions, enhances hardness, toughness, heat resistance, and corrosion resistance. The balance and distribution of these elements in the manufacturing process are crucial for overall quality and performance.
In terms of heat resistance, it can endure elevated temperatures without significant deterioration of mechanical properties or microstructure, suiting applications in industries with frequent high heat exposure, such as power generation, petrochemical, and refineries.
Corrosion resistance is another key attribute, formulated to counter chemical and environmental corrosive effects, extending lifespan and reducing maintenance. However, in extremely corrosive environments, additional protection may be needed.
The manufacturing process is complex and highly regulated, involving stages like raw material melting, precise alloying, controlled rolling, and heat treatment. Each step is closely monitored to meet ASTM standards.
Weldability is important, and with proper techniques and filler materials, strong and reliable weld joints can be achieved, essential for assembling complex structures and equipment. Skilled welders and quality control are vital for joint integrity and durability.
It is available in various forms and dimensions for design and manufacturing flexibility. When selected for a project, factors like operating conditions, temperature extremes, pressure levels, and corrosive environment must be considered. Comprehensive testing and analysis ensure it meets technical and performance expectations.
Beyond practical uses, its development contributes to technological and engineering advancements. Ongoing research aims to improve properties, processes, and sustainability.
In summary, this steel is highly engineered and valuable, crucial for challenging applications due to its mechanical, heat, and corrosion resistance, and weldability. It is likely to evolve and find wider uses in the future.
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