Chromium-Molybdenum Steel Plate for Industrial Boilers and Pressure Vessels - ASTM A387 Grade 12 Class 2 / ASME SA387 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. 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.

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