As a quality chrome moly steel, A387 Grade 11 Class 2 is used in a variety of industries and is highly effective, particularly in the oil, gas and chemical industry, where liquids and gases are often stored at high temperature (see pressure vessels).
The higher levels of chromium also provide excellent corrosion and oxidation resistance.
Please refer to our technical specifications below for ASTM A387 Grade 11 Class 2...
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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