ASTM A387 Gr11 Structural Steel Plate
boiler steel sheet Product Introduction
The alloy is considered a low-alloy grade of steel due to its high chromium and molybdenum content. ASTM A387 Grade 11 Class 2 ASTM A387/A387M steel includes a variety of grades including 9Cr-1Mo and 11Cr-1Mo. These steel grades feature elevated levels of chromium to better suit pressure-containing application in comparison to standard structural steels. By providing a higher level of chromium, the alloy can resist oxidation and better resists oxidation at high temperatures.ASTM A387 Grade 11 Class 2 ASTM A387/A387M is a material-graded steel alloy used in the production of pressure vessels and boilers
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ASTM A387 Grade 11 Class 2 ASTM A387/A387M Chemical Element
The alloy is also highly corrosion-resistant thanks to the chromium content of 0.5-9%. When exposed to high temperatures and corrosive chemical environments, the alloy maintains a high-level of performance.
Steel Grade A387 Grade 11 Class 2 composition information, ASTM A387 Grade 11 Class 2 ASTM A387/A387M element content, ASTM A387 Grade 11 Class 2 ASTM A387/A387M Heat treatment, ASTM A387 Grade 11 Class 2 ASTM A387/A387M chemistry
| Element | Min | Max | Similar |
|---|---|---|---|
| Mo | 0.4500 | 0.6500 | - |
| Cr | 1.0000 | 1.5000 | - |
| P | - | 0.0350 | - |
| S | - | 0.0350 | - |
| Mn | 0.4000 | 0.6500 | - |
| Si | 0.5000 | 0.8000 | - |
| C | 0.0500 | 0.1700 | - |
| S | - | 0.0400 | - |
| Si | 0.4400 | 0.8600 | - |
| S | - | 0.0250 | - |
| P | - | 0.0250 | - |
| Mo | 0.4000 | 0.7000 | - |
| Mn | 0.3500 | 0.7300 | - |
| Cr | 0.9400 | 1.5600 | - |
| C | 0.0400 | 0.1700 | - |
ASTM A387 Grade 11 Class 2 ASTM A387/A387M Mechanical Properties
The yield refers to the transition of ASTM A387 Grade 11 Class 2 ASTM A387/A387M from non-uniform elastic state to elastic-plastic state after reaching a certain deformation stress. It marks the beginning of macro-plastic deformation.
Tensile strength(Rm) refers to the maximum stress that ASTM A387 Grade 11 Class 2 ASTM A387/A387M bears before breaking. When the steel yields to a certain extent, its resistance to deformation increases again due to the rearrangement of internal grains. At this time, although the deformation develops rapidly, it can only increase with the increase of stress until the maximum stress is reached. Thereafter, the ASTM A387 Grade 11 Class 2 ASTM A387/A387M is ability to resist deformation is obviously reduced, and a large plastic deformation occurs at the weakest point, where the section of the specimen shrinks rapidly, leading to necking until fracture. The maximum stress value of ASTM A387 Grade 11 Class 2 ASTM A387/A387M before tensile fracture is called strength limit or tensile strength.
| Yield Rp0.2 (MPa) |
Tensile Rm (MPa) |
Impact KV/Ku (J) |
Elongation A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 399 (≥) | 466 (≥) | 23 | 43 | 12 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 434 |
ASTM A387 Grade 11 Class 2 ASTM A387/A387M Physical Properties
Physical performance parameters of ASTM A387 Grade 11 Class 2 ASTM A387/A387M are mainly indicated by density, poisson's ratio, thermal conductivity, specific thermal capacity, coefficient of thermal expansion, modulus of elasticity, electrical resistance value, etc.
| Temperature (°C) |
Modulus of elasticity (GPa) |
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) |
Specific thermal capacity (J/kg·°C) |
Specific electrical resistivity (Ω mm²/m) |
Density (kg/dm³) |
Poisson's coefficient, ν |
|---|---|---|---|---|---|---|---|
| 21 | - | - | 0.32 | - | |||
| 269 | 191 | - | 31.3 | 311 | - | ||
| 796 | - | 12 | 31.2 | 413 | 213 |
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