What are ASME SA387 Grade 11 Class 2Plates?
ASME SA387 Grade 11 Class 2 Plates are chromium-molybdenum alloy steel plates designed for use in weldedboilers and pressure vessels, These plates are specifically engineered to withstand high-temperature and high-pressureenvironments,making them ideal for the energy sector,particularly in oil, gas, and petrochemical industries, The alloycomposition includes chromium and molybdenum, which enhance the stee's strength, hardness, and resistance tocorrosion and oxidation.
SA387 Grade 11 Class 2 is a chromium-molybdenum alloy steel plate for high-temperature pressure vessels, boilers, and heat exchangers, offering strength and oxidation resistance due to its ~1.25% chromium and ~0.5% molybdenum content, with Class 2 indicating higher tensile strength (75-100 ksi) compared to Class 1, making it ideal for oil, gas, and petrochemical applications.
Key Characteristics:
Corrosion Resistance: High chromium content provides excellent resistance to oxidation and corrosion, suitable for sour gas.
Strength: Class 2 signifies higher tensile strength (515-690 MPa or 75-100 ksi) and yield strength (min 310 MPa or 43 ksi) than Class 1.
Composition: Contains approximately 1.25% Chromium and 0.5% Molybdenum.
Material Type: Chromium-Molybdenum (Cr-Mo) Alloy Steel.
Application: Elevated temperature service in pressure vessels, boilers, and heat exchangers.
Common Uses: Oil & Gas Industry, Petrochemical Plants, Welded Boilers, and Heat Exchangers.
Standards:
Certified to both ASTM A387 and ASME SA387 standards.
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 621 B | ––– | SA387-11-2 | ––– |
Chromium & Molybdenum content (according to the ASME specification):
| DESIGNATION | NOMINAL CHROMIUM CONTENT (%) | NOMINAL MOLYBDENUM CONTENT (%) |
|---|---|---|
| A387 Grade 11 | 1.25% | 0.50% |
Tensile Requirements for ASME SA387 Grade 11 Alloy Steel Plates Class 2 Plates
| Designation: | Requirement: | Grade 11 |
| SA387 Grade 11 | Tensile strength, ksi [MPa] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 43 [310] | |
| Elongation in 8 in. [200mm], min % | 18 | |
| Elongation in 2 in. [50mm], min, % | 22 | |
| Reduction of area, min % | ––– |
|
ASME SA-387 Grade 11 Class 2 |
|
|---|---|
| Tensile Strength MPa [ksi] |
450-585 [65-85] |
| Yield Strength MPa [ksi], min. |
275 [40] |
| Elongation in 8", min. % |
19 |
| Elongation in 2", min. % |
22 |
| Reduction of area, min. % |
- |
Chemical Composition of SA387 Grade 11 Class 2
| Carbon (C) | % |
| Heat Analysis: Product Analysis: |
0.05 - 0.17 0.04 - 0.17 |
| Manganese (Mn) | % |
| Heat Analysis: Product Analysis: |
0.40 - 0.65 0.35 - 0.73 |
| 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 - 0.80 0.44 - 0.86 |
| Chromium (Cr) | % |
| Heat Analysis: Product Analysis: |
1.00 - 1.50 0.94 - 1.56 |
| Molybdenum (Mo) | % |
| Heat Analysis: Product Analysis: |
0.45 - 0.65 0.45 - 0.70 |
1What is ASME SA387 Grade 11 Class 2 material ?
ASME SA387 Grade 11 Class 2 is a high-strength, chromium-molybdenum alloy steel designed for pressure vessels and boilers operating at high temperatures, offering excellent oxidation and corrosion resistance, especially in oil, gas, and chemical industries. It provides superior high-temperature strength and durability due to its specific Cr (around 1.25%) and Mo (around 0.50%) content, supplied in a normalized and tempered condition for demanding service.
2what is asme sa387 grade 11 class 2 equivalent to ?
ASME SA387 Grade 11 Class 2 is a high-temperature chromium-molybdenum steel for boilers/pressure vessels, equivalent to ASTM A387 Grade 11 Class 2, with European equivalents being EN 13CrMoSi5-5 (EN standard) and BS 621B (British Standard), all denoting similar chemical composition (1.25Cr-0.5Mo) but different mechanical properties, especially tensile strength, for Class 2.
3What is the composition of asme sa387 grade 11 class 2 ?
ASME SA387 Grade 11 Class 2 is a Cr-Mo alloy steel for high-temp pressure vessels, with key elements being 1.00-1.50% Chromium, 0.45-0.65% Molybdenum, and 0.50-0.80% Silicon, along with controlled Carbon (0.05-0.17%), Manganese (0.40-0.65%), and low Sulfur/Phosphorus (≤0.025%), providing excellent high-temperature strength, oxidation, and corrosion resistance, with "Class 2" indicating higher mechanical strength requirements than Class 1, requiring normalizing and tempering.
4What is the density of asme sa387 grade 11 class 2 ?
The density for ASME SA387 Grade 11 Class 2 steel is approximately 7.85 g/cm³ (or 0.284 lbs/in³), typical for alloy steels, though specific values can vary slightly by manufacturer; this chrome-moly steel has 1.25% Chromium and 0.50% Molybdenum, giving it good high-temperature strength for pressure vessels.
5What is the maximum allowable stress value for asme sa387 grade 11 class 2 ?
The maximum allowable stress for ASME SA387 Grade 11 Class 2 isn't a single fixed number but varies with temperature, determined by the ASME Boiler & Pressure Vessel Code (BPVC) Section II, Part D, typically derived from its minimum yield strength (43 ksi / 310 MPa) and tensile strength (75-100 ksi / 515-690 MPa), with codes like B31.3 applying safety factors (e.g., 1/3 yield or 1/4 tensile) for various service temperatures, requiring consultation with the specific code tables for precise values.
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