A387 Grade 9 Class 2 chrome-molybdenum plate is an ideal material for welded pressure vessels and boilers used in elevated temperature service. With excellent resistance to high temperature and corrosion, this type of steel is commonly used in the petrochemical, oil, gas and power generation industry. All plates come with mill test certification and individual stampings. Third party testing can be arranged at the customers request.
Different Grades of ASTM / ASME Grade 9 Chromium-Molybdenum Alloy
Masteel's range of ASTM / ASME A387 Grade 9 chromium-molybdenum alloy products are available in different grades listed in the following.
- ASTM A387 Grade 9 Class 2
- ASME SA387 Grade 9 Class 2
Equivalent Grade of A387 Grade 9 Chromium-Molybdenum Alloy
The equivalent grade of A387 Grade 9 chromium-molybdenum alloy is as follows:
|
BS
|
EN
|
ASTEM/ASME
|
DIN
|
|
-
|
-
|
A387-9-2
|
-
|
Chromium and Molybdenum Composition of A387 Grade 9 Chromium-Molybdenum Alloy
The chromium and molybdenum contents of A387 Grade 9 chromium-molybdenum alloy (according to the ASTM specification) are outlined in the following table.
|
Designation
|
Nominal Chromium Content (%)
|
Nominal Molybdenum Content (%)
|
|
A387 Grade 9
|
9.00%
|
1.00%
|
Tensile Requirements for A387 Grade 9 Chrome Molybdenum Class 2 Plates
The tensile requirements for A387 Grade 9 chromium-molybdenum alloy Class 2 plates are listed in the following table.
|
Designation
|
Requirement
|
Grade 9
|
|
A387 Grade 9
|
Tensile strength, ksi [MPA]
|
75 to 100 [515 to 690]
|
| |
Yield strength, min, ksi [MPa]/(0.2% offset)
|
45 [310]
|
| |
Elongation in 8 in. [200mm], min %
|
-
|
| |
Elongation in 2 in. [50mm], min, %
|
18
|
| |
Reduction of area, min %
|
45 (measured on round test specimens)
40 (measured on flat test specimen)
|
Chemical Composition of A387 Grade 9 Chromium-Molybdenum Alloy
The chemical composition of A387 Grade 9 chromium-molybdenum alloy from heat and product analysis is summarised in the following table.
|
Element
|
Analysis
|
Chemical Composition (%) inc. Grade & UNS No.
|
| |
|
Grade 9 (UNS: S50200)
|
|
Carbon:
|
Heat Analysis:
Product Analysis:
|
0.15 max
0.15 max
|
|
Manganese:
|
Heat Analysis:
Product Analysis:
|
0.30 - 0.60
0.25 - 0.66
|
|
Phosphorus:
|
Heat Analysis:
Product Analysis:
|
0.030
0.030
|
|
Sulphur (max):
|
Heat Analysis:
Product Analysis:
|
0.030
0.030
|
|
Silicon:
|
Heat Analysis:
Product Analysis:
|
1.00 max
1.05 max
|
|
Chromium:
|
Heat Analysis:
Product Analysis:
|
8.00 - 10.00
7.90 - 10.10
|
|
Molybdenum:
|
Heat Analysis:
Product Analysis:
|
0.90 - 1.10
0.85 - 1.15
|
|
Vanadium:
|
Heat Analysis:
Product Analysis:
|
0.04 max
0.05 max
|
Tensile Test Requirements for Chromium-Molybdenum Alloy
The material shall be tested using a test specimen will confirm to the tensile requirements as outlined in tensile requirements for A387 Grade 9 chromium-molybdenum alloy Class 2 plates above.
Recommended Testing Procedures for Chromium-Molybdenum Alloy
The following requirements and testing procedures (which are not mandatory) are considered suitable for chromium-molybdenum alloy:
- Vacuum treatment
- Product Analysis
- Additional Tension Tes
- Charpy V-Notch Impact Test
- Drop Weight Test
- High Temperature Tension Test
- Ultrasonic Examination
- Magnetic Particle Examination
To find out more about Masteel's services and ASTM A387 Grade 9 Class 2 steel plates which we can supply directly to you please visit Masteel.
This information has been sourced, reviewed and adapted from materials provided by Masteel UK Ltd.
For more information on this source, please visit Masteel UK Ltd