ASTM A387 Grade 12 Class 2

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

BSENASTM/ASMEDIN
620B13CrMo45A/SA387-12-213CrMo44

Chromium & Molybdenum content (according to the ASTM specification):

DesignationNominal Chromium Content (%)Nominal Molybdenum Content (%)
A387 Grade 121.00%0.50%

Tensile Requirements for Class 2 Plates

DesignationRequirementGrade 12
A387 Grade 12Tensile 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 Requirements:

  
Carbon (C)%
Heat Analysis:
Product Analysis:
0.05 - 0.17
0.04 - 0.17
Manganese (Mn)%
Heat Analysis:
Product Analysis:
0.40 - 0.65
0.35 - 0.73
Phosphorus (P)%
Heat Analysis:
Product Analysis:
0.035
0.035
Sulphur (S) (Max)%
Heat Analysis:
Product Analysis:
0.035
0.035
Silicon (Si)%
Heat Analysis:
Product Analysis:
0.15 - 0.40
0.13 - 0.45
Chromium (Cr)%
Heat Analysis:
Product Analysis:
0.80 - 1.15
0.74 - 1.21
Molybdenum (Mo)%
Heat Analysis:
Product Analysis:
0.45 - 0.60
0.40 - 0.65