More common application of this grade is in Refineries, Power Plants, and certain areas of Chemical Plants in environments with elevated temperatures and limited corrosion concerns. In the lower end of the temperature range SA 387 Gr 11 (1150 °F min tempering temperature) , and SA 387 Gr 22 (1250 °F min tempering temperature) are used. These grades can be specified in either class 1 or 2 and can also be provided in the Normalized & Tempered or Quenched and Tempered. For more severe environments we can perform API 934 Testing to supplement this grade.
In the tables use SA 387 Gr 11 and SA 387 Gr 22
*Elements represented in percentage
Element Composition % | ||
---|---|---|
SA 387 Grade 11 |
SA 387 Grade 22 |
|
Carbon, max: | ||
Heat analysis | 0.05-0.17 | 0.05-0.15A |
Product analysis | 0.04-0.17 | 0.04-0.15A |
Manganese, max: | ||
Heat analysis | 0.40-0.65 | 0.30-0.60 |
Product analysis | 0.35-0.73 | 0.25-0.66 |
Phosphorus, max: | ||
Heat analysis | 0.025 | 0.025 |
Product analysis | 0.025 | 0.025 |
Sulfur, max: | ||
Heat analysis | 0.025 | 0.025 |
Product analysis | 0.025 | 0.025 |
Silicon: | ||
Heat analysis | 0.50-0.80 | 0.50 max |
Product analysis | 0.44-0.86 | 0.50 max |
Chromium: | ||
Heat analysis | 1.00-1.50 | 2.00-2.50 |
Product analysis | 0.94-1.56 | 1.88-2.62 |
Molybdenum: | ||
Heat analysis | 0.45-0.65 | 0.90-1.10 |
Product analysis | 0.40-0.70 | 0.85-1.15 |
SA 387 Grade 11 |
SA 387 Grade 22 |
|
---|---|---|
Tensile strength, ksi [MPa] | 60 to 85 [415 to 585] |
60 to 85 [415 to 585] |
Yield strength min. ksi [MPa] | 35 | 30 |
Elongation in 8 in. [200 mm], min. % | 19 | |
Elongation in 2 in. [50 mm], min. % | 22 | 18 |
Reduction of area, min % | 45 40 |
SA 387 Grade 11 |
SA 387 Grade 22 |
|
---|---|---|
Tensile strength, ksi [MPa] | 75 to 100 [515 to 690] | 75 to 100 [515 to 690] |
Yield strength min. ksi [MPal]/(0.2% offset) | 45 [310] | 45 [310] |
Elongation in 8 in. [200 mm], min. %B | 18 | … |
Elongation in 2 in. [50 mm], min. %B | 22 | 18 |
Reduction of area, min % | … | 45 40 |