Which is Better, SA 387 Gr. 22 or SA 387 Gr. 11?

When selecting the right alloy steel plate for high-temperature and pressure applications, two popular choices often come to mind: this is a request for the recovery of the SA-387’s lost grades. Similar to this are both, the two well-known steel grades, used in the manufacture of pressure vessels, boilers, and the other main components. Naturally, many people, especially the undecided, may find themselves finding the difference between these two grades hard to digest. However, after getting used to these two grades, one will have the basis on which he/she can form an opinion. This blog will demonstrate the difference between SA 387 Gr 22 and. SA 387 Gr 11 and look for those who can help you decide which will suit you best.

Chemical Composition & Mechanical Properties

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There is a large difference between the content level of both components. SA 387 Gr 22 has more Cr and Mo in the chemical composition than SA 387 Gr 11. A morphism is indeed responsible for the correlated properties that relate to every stage in the composition.

SA387 Gr 22 is clearly superior to other materials in creep resistance and ultimate strength at high temperatures. Hence, this grade may be utilized in those components that have to endure the detrimental effects of pressure on them for a long time. In the case of the latter, chromium and molbendum are relatively higher in contrast to the other, which leads to increase in weldability and formability. On the other hand, the former has a lower number of the two elements, which is why it has lower weldability and formability.

Temperature Range and Applications

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Another determinant influencing the choice of either SA 387Gr 22 is the temperature range and general application. SA387 Gr22 is an alloy steel grade originally intended to tolerate temperatures up to 1200°F (649°C), which is typical for applications in pressure vessel plates, boiler plates, or other high-temperature applications.

SA 387 Gr 11, however, belongs to the field that can be adapted to lower temperature ranges up to 1100°F (593°C). This grade has become quite common in industries as diverse as automotive and construction but is often the preferred material for its ease of manufacturing or welding and an excellent choice for thin sections.

Cost Considerations

While choosing SA 387 Gr. 22 or SA 387 Gr. 11, price is a determining factor. As its alloy content is higher and it has high-temperature (HT) strength improvements that make it special than SA 387 Gr. 11, SA 387 Gr. 22 is typically considered very expensive.

Nevertheless, such a scenario needs to be evaluated carefully from a long-term cost input perspective. SA 387 Gr 22, possibly more expensive at first, can be counterbalanced by its enhanced creep resistance level and wide temperature range, which will result in lesser costs as the maintenance becomes less redundant.

Conclusion

Choosing a steel fall within SA 387 Gr 22 and SA 387 Gr 11 is necessary as per your specific needs. SA 387 Gr 22 exceeds the rest with its extraordinary resistance to the highest temperatures, and SA 387 Gr 11 is a perfect candidate for a welded shape. When you go on this journey, Triton Alloys will be a reliable supplier who you can trust in your decision-making and source the highest quality materials for your endeavor.