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.
The steel has a wide range of uses including industrial boilers and pressure vessels, especially in environments where high temperature levels are common.
Equivalents:
BS
EN
ASTM/ASME
DIN
621 B
...
A387-11-2
...
Specifications:
Chromium & Molybdenum content (according to the ASTM specification):
Designation
Nominal Chromium Content (%)
Nominal Molybdenum Content (%)
A387 Grade 11
1.25%
0.50%
Tensile Requirements for Class 2 Plates:
Designation:
Requirement:
Grade11
A387 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 %
–––
Chemical Requirements:
Element
Chemical Composition (%) inc. Grade & UNS No.
Grade 11 (UNS: K11789)
Carbon:
Heat Analysis:
0.05 - 0.17
Product Analysis:
0.04 - 0.17
Manganese:
Heat Analysis:
0.40 - 0.65
Product Analysis:
0.35 - 0.73
Phosphorus:
Heat Analysis:
0.035
Product Analysis:
0.035
Sulphur (max):
Heat Analysis:
0.035
Product Analysis:
0.035
Silicon:
Heat Analysis:
0.50 - 0.80
Product Analysis:
0.44 - 0.86
Chromium:
Heat Analysis:
1.00 - 1.50
Product Analysis:
0.94 - 1.56
Molybdenum:
Heat Analysis:
0.45 - 0.65
Product Analysis:
0.45 - 0.70
Tension Test Requirements:
Material shall be tested using a test specimen will confirm to the tensile requirements as outlined in Table 2.
Other requirements:
The following requirements and testing procedures (which are not mandatory) are considered suitable for Chrome 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
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