Chromium-Molybdenum Alloy Steel Plate for Industrial Applications - ASTM/ ASME A387 Grade 91 Class 2 by Masteel

Background

Masteel UK Ltd are a global steel supply and stockholding company, supplying the engineering, power generation, petrochemical, oil and gas and nuclear industries.

Partnerships integrating the resources of the worlds most technically advanced steel mills enable Masteel to provide a single competitive source for the distribution of steel products worldwide,

Chromium-Molybdenum Alloy - A387 Grade 91 Class 2

High quality A387 Grade 91 Class 2 - manufactured at some of the world's finest steel mills, this chrome-molybdenum alloy has excellent resistance to high working temperatures making it ideal for use in the oil, gas, chemical and power generation industry applications. Our plates can be supplied from our own stockholding or directly from the mill - all plates come with mill test certification and individual stampings. Third party testing can be arranged at the customers request.

Different Grades of ASTM / ASME Grade 91 Chromium-Molybdenum Alloy

Masteel's range of ASTM / ASME A387 Grade 91 chromium-molybdenum alloy products are available in different grades listed in the following.

  • ASTM A387 Grade 91 Class 2
  • ASME SA387 Grade 91 Class 2

Equivalent Grade of A387 Grade 91 Chromium-Molybdenum Alloy

The equivalent grade of A387 Grade 91 chromium-molybdenum alloy is as follows:

BS

EN

ASTEM/ASME

DIN

-

-

A387-91-2

-

Chromium and Molybdenum Composition of A387 Grade 91 Chromium-Molybdenum Alloy

The chromium and molybdenum contents of A387 Grade 91 chromium-molybdenum alloy (according to the ASTM specification) are outlined in the following table.

Designation

Nominal Chromium Content (%)

Nominal Molybdenum Content (%)

A387 Grade 91

9.00%

1.00%

Tensile Requirements for A387 Grade 91 Chrome Molybdenum Class 2 Plates

The tensile requirements for A387 Grade 91 chromium-molybdenum alloy Class 2 Plates are listed in the following table.

Designation

Requirement

Grade 91

A387 Grade 91

Tensile strength, ksi [MPA]

85 to 110 [585 to 760]

Yield strength, min, ksi [MPa]/(0.2% offset)

60 [415]

Elongation in 8 in. [200mm], min %

-

Elongation in 2 in. [50mm], min, %

18

Reduction of area, min %

-

Chemical Composition of A387 Grade 91 Chromium-Molybdenum Alloy

The chemical composition of A387 Grade 91 chromium-molybdenum alloy from heat and product analysis is summarised in the following table.

Element

Analysis

Chemical Composition (%) inc. Grade & UNS No.

Grade 91 (UNS: S50200)

Carbon:

Heat Analysis:
Product Analysis:

0.08 - 0.12
0.06 - 0.15

Manganese:

Heat Analysis:
Product Analysis:

0.30 - 0.60
0.25 - 0.66

Phosphorus:

Heat Analysis:
Product Analysis:

0.020
0.025

Sulphur (max):

Heat Analysis:
Product Analysis:

0.012
0.010

Silicon:

Heat Analysis:
Product Analysis:

0.20 - 0.50
0.18 - 0.56

Chromium:

Heat Analysis:
Product Analysis:

8.00 - 9.50
7.90 - 9.60

Molybdenum:

Heat Analysis:
Product Analysis:

0.85 - 1.05
0.80 - 1.10

Nickel, max:

Heat Analysis:
Product Analysis:

0.40
0.43

Vanadium:

Heat Analysis:
Product Analysis:

0.18 - 0.25
0.16 - 0.27

Columbium:

Heat Analysis:
Product Analysis:

0.06 - 0.10
0.05 - 0.11

Nitrogen:

Heat Analysis:
Product Analysis:

0.030 - 0.070
0.025 - 0.080

Aluminum:

Heat Analysis:
Product Analysis:

0.02
0.02

Titanium:

Heat Analysis:
Product Analysis:

0.01
0.01

Zirconium:

Heat Analysis:
Product Analysis:

0.01
0.01

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 91 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 91 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.

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