Heat Treatment Process for SA387 Grade 11 Steel Plates
As a Pressure Vessel grade steel for use in elevated temperature service, ASME SA387 Grade 11 Steel Plate and Stainless Steel Plate is used in a variety of industries and is highly effective, particularly in the oil, gas and petrochemical industry, where liquids and gases are often stored at higher temperatures The higher levels of chromium also provide excellent corrosion and oxidation resistance, which is a must in sour gas applications
A pressure vessel grade steel for use in elevated temperature service, ASME SA387 Grade 11 Class 2 is used in a variety of industries and is highly effective, particularly in the oil, gas and petrochemical industry, where liquids and gases are often stored at higher temperatures The higher levels of chromium also provide excellent corrosion and oxidation resistance, which is a must in sour gas applications.
Heat Treatment Process Overview
Optimizing the heat treatment for SA387 Grade 11 steel plate involves carefully controlling the temperature, time, and cooling rate to achieve the desired mechanical properties and microstructure. SA387 Grade 11 is a chromium-molybdenum Alloy Steel used in the fabrication of industrial boilers and pressure vessels for elevated temperature service. Here are the key steps and considerations for optimizing the heat treatment process.
The tubing and piping systems are multifunctional and operate at different pressures and temperatures, it is reasonable that the components involved are manufactured from different alloys using a range of fabrication techniques.
Moreover, because the design conditions of different Boiler vary within a broad power-generating system, many different alloys will be used in various product forms.
The materials used and the associated product quality checks are covered by applicable specifications and standards.
However, it is frequently necessary for utility engineers to have access to basic metallurgical information to aid decision making for specific projects.
Maintaining accurate knowledge of the full range of Boiler materials is becoming an increasing challenge for two main reasons: the information base continues to grow even for wellestablished alloys, and new alloys-many with complex metallurgy-are being introduced.
Heat Treatment Objectives
Improve toughness: Enhance the toughness of the steel to prevent brittle failure.
Increase hardness: Achieve a balance between hardness and toughness
Enhance mechanical properties: Improve tensile strength, yield strength, and elongation.
Heat Treatment Processes
Normalizing is performed to refine the grain size and improve the uniformity of the microstructure.
Temperature: 900-950°C (1650-1740°F)
Cooling: Air cooling
Austenitizing is done to transform the steel's microstructure to austenite, which is necessary for subsequent treatments.
Temperature: 870-930°C (1600-1700°F)
Soaking Time: Sufficient to allow the entire section to reach a uniform temperature
Quenching is performed to increase hardness and Strength. However, rapid cooling can cause thermal stresses and distortions.
Medium: Oil or water (oil is preferred for slower cooling rates)
Cooling Rate: Controlled to avoid cracking and excessive residual stresses
Tempering is done to reduce brittleness and increase toughness by reducing residual stresses from quenching.
Temperature: 650-750°C (1200-1380°F)
Cooling: Air cooling
Time: 1-2 hours, depending on the thickness and desired properties
ABOUT SA387 Grade 11 Steel Plates
Chemical Requirements
| 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 |
Tensile Requirements For Class 1 Plates
| 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 |
Tensile Requirements For Class 2 Plates
| 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 |
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People also ask
Q: What is SA 387 GR-11 material?
A: SA 387 Gr 11 Plates are chromium molybdenum alloy steel plates primarily used in pressure vessels, heat exchangers and boilers at high temperatures. They are made of chromium-molybdenum alloy with an added amount of carbon, which increases their strength and provides outstanding corrosion resistance properties.
Q: What is SA387 grade 11 equivalent to?
A: Sa 387 Gr 11 Equivalent Material is the ASME SA387 in the US markets with the European Union having modules in 13CrMoSi5-5 grade. The Sa 387 Gr 11 Cl 2 Equivalent Material is the SA387-11-2 of the ASME and ASTM standard.
Q: What is the difference between SA387 Grade 11 Class 1 and Class 2?
A: The difference between SA 387 Grade 11 Class 1 and Class 2 Plate lies in their mechanical properties. However, they both have the same chemical composition. The tensile strength and yield strength of class 2 material is higher than that of class 1, whereas the elongation for class 1 is higher compared to class 2.
Q: What is the temperature range for SA 387 GR 11?
A: 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.
Q: What is the SA387 standard?
A: The ASME SA387 standard covers the supply of weldable chrome molybdenum alloy steel plates for pressure vessels used in elevated temperature service. The added molybdenum and chromium provides excellent corrosion resistance and high temperature resistance respectively.
