ASTM A387 PLATES

The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum plates used in the application of welded boilers and pressure vessels subjected to elevated temperatures. The two grades SSAB produces are available as Class 1 and/or Class 2.

ASTM 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. We supply to fabricators who serve these industries on a global basis.

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.

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

Designation Nominal Chromium Content (%) Nominal Molybdenum Content (%)
A387 Grade 91 9.00% 1.00%

Tensile Requirements for Class 2 Plates

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 Requirements

Carbon (C) %
Heat Analysis:
Product Analysis:
0.08 – 0.12
0.06 – 0.15
Manganese (Mn) %
Heat Analysis:
Product Analysis:
0.30 – 0.60
0.25 – 0.66
Phosphorus (P) %
Heat Analysis:
Product Analysis:
0.020
0.025
Sulphur (S) (Max) %
Heat Analysis:
Product Analysis:
0.010
0.012
Silicon (Si) %
Heat Analysis:
Product Analysis:
0.20 – 0.50
0.18 – 0.56
Chromium (Cr) %
Heat Analysis:
Product Analysis:
8.00 – 9.50
7.90 – 9.60
Molybdenum (Mo) %
Heat Analysis:
Product Analysis:
0.85 – 1.05
0.80 – 1.10
Nickel (Ni) %
Heat Analysis:
Product Analysis:
0.40
0.43
Vanadium (Vn) %
Heat Analysis:
Product Analysis:
0.18 – 0.25
0.16 – 0.27
Columbium (Nb) %
Heat Analysis:
Product Analysis:
0.06 – 0.10
0.05 – 0.11
Nitrogen (N) %
Heat Analysis:
Product Analysis:
0.030 – 0.070
0.025 – 0.080
Aluminium (Al) %
Heat Analysis:
Product Analysis:
0.02
0.02
Titanium (Ti) %
Heat Analysis:
Product Analysis:
0.01
0.01
Zirconium (Zr) %
Heat Analysis:
Product Analysis:
0.01
0.01

ASTM A387 Grade 22 Class 2

A387 Grade 22 Class 2 is a grade of chromium-molybdenum alloy intended primarily for use fabricators 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.

Equivalents

BS EN ASTM/ASME DIN
622-515B 10CrMo910 A/SA387-22-2 10CrMo910

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

Designation Nominal Chromium Content (%) Nominal Molybdenum Content (%)
A387 Grade 22 2.25% 1.00%

Tensile Requirements for Class 2 Plates

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 specimen)

Chemical Requirements

Carbon (C) %
Heat Analysis:
Product Analysis:
0.05 – 0.15
0.04 – 0.15
Manganese (Mn) %
Heat Analysis:
Product Analysis:
0.30 – 0.60
0.25 – 0.66
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:
0.50 max
0.50 max
Chromium (Cr) %
Heat Analysis:
Product Analysis:
2.00 – 2.50
1.88 – 2.62
Molybdenum (Mo) %
Heat Analysis:
Product Analysis:
0.90 – 1.10
0.85 – 1.15

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

BS EN ASTM/ASME DIN
620B 13CrMo45 A/SA387-12-2 13CrMo44

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

Designation Nominal Chromium Content (%) Nominal Molybdenum Content (%)
A387 Grade 12 1.00% 0.50%

Tensile Requirements for Class 2 Plates

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 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

ASTM A387 Grade 11 Class 2

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.

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 Grade 11
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: 

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:
0.50 – 0.80
0.44 – 0.86
Chromium (Cr) %
Heat Analysis:
Product Analysis:
1.00 – 1.50
0.94 – 1.56
Molybdenum (Mo) %
Heat Analysis:
Product Analysis:
0.45 – 0.65
0.45 – 0.70

(Maximum values unless stated otherwise)

ASTM A387 Grade 9 Class 2

A387 Grade 9 Class 2 – chrome–molybdenum plate is an ideal material for welded pressure vessels and boilers used in elevated temperature service. With excellent resistance to high temperature and corrosion, this type of steel is commonly used in the petrochemical, oil, gas and power generation industry.

All plates come with mill test certification and individual stamping. Third party testing can be arranged at the customers request.

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

Designation Nominal Chromium Content (%) Nominal Molybdenum Content (%)
A387 Grade 5 9.00% 1.00%

Tensile Requirements for Class 2 Plates:

Designation Requirement Grade 9
A387 Grade 9 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 specimen)

Chemical Requirements:

Carbon (C) %
Heat Analysis:
Product Analysis:
0.15 max
0.15 max
Manganese (Mn) %
Heat Analysis:
Product Analysis:
0.30 – 0.60
0.25 – 0.66
Phosphorus (P) %
Heat Analysis:
Product Analysis:
0.030
0.030
Sulphur (S) (Max) %
Heat Analysis:
Product Analysis:
0.030
0.030
Silicon (Si) %
Heat Analysis:
Product Analysis:
1.00 max
1.05 max
Chromium (Cr) %
Heat Analysis:
Product Analysis:
8.00 – 10.00
7.90 – 10.10
Molybdenum (Mo) %
Heat Analysis:
Product Analysis:
0.90 – 1.10
0.85 – 1.15
Vanadium (Vn) %
Heat Analysis:
Product Analysis:
0.04 max
0.05 max

ASTM A387 Grade 5 Class 2

A387 Grade 5 Class 2 – high quality chromium-molybdenum alloy steel plate, ideal for use in pressure vessels and industrial boilers due to it’s excellent heat resistant and anti corrosion properties.

We can supply plates from our own stockholding in Birmingham or directly from the mill and all plates come with mill test certification and individual stampings.

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

Designation Nominal Chromium Content (%) Nominal Molybdenum Content (%)
A387 Grade 5 5.00% 0.50%

Tensile Requirements for Class 2 Plates:

Designation Requirement Grade 5
A387 Grade 5 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 specimen)

Chemical Requirements:

Carbon (C) %
Heat Analysis:
Product Analysis:
0.15 max
0.15 max
Manganese (Mn) %
Heat Analysis:
Product Analysis:
0.30 – 0.60
0.25 – 0.66
Phosphorus (P) %
Heat Analysis:
Product Analysis:
0.035
0.035
Sulphur (S) (Max) %
Heat Analysis:
Product Analysis:
0.030
0.030
Silicon (Si) %
Heat Analysis:
Product Analysis:
0.50 max
0.55 max
Chromium (Cr) %
Heat Analysis:
Product Analysis:
4.00 – 6.00
3.90 – 6.10
Molybdenum (Mo) %
Heat Analysis:
Product Analysis:
0.45 – 0.65
0.40 – 0.70

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