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Topics Covered
Background
Chromium-Molybdenum Alloy - A387
Grade 22 Class 2
Different Grades of ASTM / ASME Grade 22
Chromium-Molybdenum Alloy
Equivalent Grades of A387 Grade 22
Chromium-Molybdenum Alloy
Chromium and Molybdenum
Composition of A387 Grade 22 Chromium-Molybdenum Alloy
Tensile Requirements for A387 Grade 22 Chrome Molybdenum Class 2
Plates
Chemical Composition of A387 Grade 22
Chromium-Molybdenum Alloy
Tensile Test Requirements for
Chrome Molybdenum Steel
Recommended Testing Procedures for
Chrome Molybdenum Steel
Background
Masteel UK
Ltd are a global steel supply and stockholding company, supplying the
engineering, power generation, petrochemical, oil & gas and nuclear
industries.
Partnerships integrating the resources of the worlds most technically
advanced steel mills enable Masteel to provide a single competitive source for the
distribution of steel products worldwide,
Chromium-Molybdenum Alloy - A387 Grade 22 Class 2
A387 Grade
22 Class 2 is a grade of chromium-molybdenum alloy intended primarily for use in
welded boilers and pressure vessels which are designed for use in raised
temperature service. With excellent heat resistance and anti corrosive/oxidation
qualities, this steel grade is ideal for use in the chemical, oil and gas
industry.
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Different Grades of ASTM / ASME Grade 22 Chromium-Molybdenum Alloy
Masteel's range of ASTM / ASME A387
Grade 22 chromium-molybdenum alloy products are available in different
grades listed in the following.
- ASTM A387 Grade 22 Class 2
- ASME SA387 Grade 22 Class 2
Equivalent Grades of A387 Grade 22 Chromium-Molybdenum Alloy
The equivalent grades of A387 Grade 22 chromium-molybdenum alloy are as follows:
|
BS |
EN |
ASTEM/ASME |
DIN |
|
622-515B |
10 CRMO 910 |
A387-22-2 |
10 CRMO 910 |
Chromium and Molybdenum Composition of A387 Grade 22 Chromium-Molybdenum
Alloy
The chromium
and molybdenum contents of A387 Grade 22
chromium-molybdenum alloy (according to the ASTM
specification) are outlined in the following table.
|
Designation |
Nominal Chromium Content
(%) |
Nominal Molybdenum Content
(%) |
|
A387 Grade 22 |
2.25% |
1.00% |
Tensile Requirements for A387 Grade 22 Chrome Molybdenum Class 2 Plates
The tensile requirements for A387 Grade 22
chromium-molybdenum alloy Class 2 Plates are listed in the following table.
|
Designation |
Requirement |
Grade 22 |
|
A387 Grade 22 |
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 specimen)
40 (measured on flat
specifmen) |
Chemical Composition of A387 Grade 22 Chromium-Molybdenum Alloy
The chemical composition of A387 Grade 22
chromium-molybdenum alloy from heat and product analysis is
summarised in the following table.
|
Element |
Analysis |
Chemical Composition (%) inc. Grade & UNS
No. |
| |
|
Grade 22 (UNS: K11757) |
|
Carbon: |
Heat Analysis:
Product Analysis:
|
0.05 - 0.15
0.04 - 0.15
|
|
Manganese: |
Heat Analysis:
Product Analysis: |
0.30 - 0.60
0.25 - 0.66
|
|
Phosphorus: |
Heat Analysis:
Product Analysis: |
0.035
0.035 |
|
Sulphur (max): |
Heat Analysis:
Product Analysis: |
0.035
0.035 |
|
Silicon: |
Heat Analysis:
Product Analysis: |
0.50 max
0.50 max
|
|
Chromium: |
Heat Analysis:
Product Analysis: |
2.00 - 2.50
1.88 - 2.62
|
|
Molybdenum: |
Heat Analysis:
Product Analysis: |
0.90 - 1.10
0.85 - 1.15
|
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 22
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 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 22
Class 2 steel plates which we can supply directly to you please visit Masteel.
Source: Masteel UK Ltd.
For more information on this source please visit Masteel
UK Ltd.