Chromium-Molybdenum Alloy for Welded Boilers and Pressure Vessels - ASTM A387 Grade 22 Class 2 / ASME SA387 Grade 22 Class 2

Background

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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.

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.

Comments

  1. Micael Dinis Micael Dinis Portugal says:

    Is there any place I can go to have a cost estimation on equipment made of this alloy?

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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