A387 Grade 12 Class 2 is a high quality chrome molybdenum steel which is ideal for elevated temperature service and offers excellent anti corrosion characteristics. Chrome molybdenum steel has a wide range of uses including industrial boilers and pressure vessels, especially in environments where high temperature levels are common.
Different Grades of ASTM / ASME Grade 12 Chromium Molybdenum Steel
Masteel's range of ASTM / ASME A387 Grade 12 Chromium Molybdenum Steel products are available in different grades listed in the following.
- ASTM A387 Grade 12 Class 2
- ASME SA387 Grade 12 Class 2
Equivalent Grades of A387 Grade 12 Chromium Molybdenum Steel
The equivalent grades of A387 Grade 12 Chromium Molybdenum Steel are as follows:
|
BS
|
EN
|
ASTEM/ASME
|
DIN
|
|
620B
|
3 CRMO 45
|
A387-12-2
|
13 CRMO 44
|
Chromium and Molybdenum Composition of A387 Grade 12 Chromium Molybdenum Steel
The chromium and molybdenum contents of A387 Grade 12 Chromium Molybdenum Steel (according to the ASTM specification) are outlined in the following table.
|
Designation
|
Nominal Chromium Content (%)
|
Nominal Molybdenum Content (%)
|
|
A387 Grade 12
|
1.00%
|
0.50%
|
Tensile Requirements for A387 Grade 12 Chromium Molybdenum Class 2 Plates
The tensile requirements for A387 Grade 12 Chromium Molybdenum Class 2 Plates are listed in the following table.
|
Designation
|
Requirement
|
Grade 12
|
|
A387 Grade 12
|
Tensile strength, ksi [MPA]
|
65 to 85 [450 to 585]
|
| |
Yield strength, min, ksi [MPa]/(0.2% offset)
|
40 [275]
|
| |
Elongation in 8 in. [200mm], min %
|
19
|
| |
Elongation in 2 in. [50mm], min, %
|
22
|
| |
Reduction of area, min %
|
-
|
Chemical Composition of A387 Grade 12 Chromium Molybdenum Steel
The chemical composition of A387 Grade 12 Chromium Molybdenum Steel from heat and product analysis is summarised in the following table.
|
Element
|
Analysis
|
Chemical Composition (%) inc. Grade & UNS No.
|
| |
|
Grade 12 (UNS: K11757)
|
|
Carbon:
|
Heat Analysis:
Product Analysis:
|
0.05 - 0.17
0.04 - 0.17
|
|
Manganese:
|
Heat Analysis:
Product Analysis:
|
0.40 - 0.65
0.35 - 0.73
|
|
Phosphorus:
|
Heat Analysis:
Product Analysis:
|
0.035
0.035
|
|
Sulphur (max):
|
Heat Analysis:
Product Analysis:
|
0.035
0.035
|
|
Silicon:
|
Heat Analysis:
Product Analysis:
|
0.15 - 0.40
0.13 - 0.45
|
|
Chromium:
|
Heat Analysis:
Product Analysis:
|
0.80 - 1.15
0.74 - 1.21
|
|
Molybdenum:
|
Heat Analysis:
Product Analysis:
|
0.45 - 0.60
0.40 - 0.65
|
Tensile Test Requirements for Chromium Molybdenum Steel
The material shall be tested using a test specimen will confirm to the tensile requirements as outlined in tensile requirements for A387 Grade 12 Chromium Molybdenum Class 2 Plates above.
Recommended Testing Procedures for Chromium Molybdenum Steel
The following requirements and testing procedures (which are not mandatory) are considered suitable for Chromium Molybdenum steel:
- Vacuum treatment
- Product Analysis
- Additional Tension Test
- 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 12 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