ASTM A387/A387M Standard
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 Standard is a standard specification for pressure vessel plates made of chromium-molybdenum (Cr-Mo) alloy steel, designed for welded boilers and pressure vessels operating at elevated temperatures, offering excellent corrosion/oxidation resistance, with various grades (like 11, 22, 91) and strength classes (Class 1, 2) for different service requirements.
Key Aspects of ASTM A387:
Material Type: Chromium-Molybdenum (Cr-Mo) Alloy Steel.
Primary Use: Welded boilers, pressure vessels, and equipment in oil & gas, chemical, and power industries needing high-temperature strength.
Grades: Different grades (e.g., Grade 11, Grade 22, Grade 91) have varying chemical compositions, especially chromium and molybdenum, affecting performance.
Classes: Grades are often available in Class 1 or Class 2, indicating different tensile strength levels, with Class 2 offering higher strength and toughness for more critical applications.
Properties: Provides good high-temperature creep strength and resistance to oxidation and corrosion.
Standards: Equivalent to ASME SA387 for pressure vessel applications.
In essence, it's the material specification for tough, heat-resistant steel plates used in demanding industrial containment and heat transfer equipment.
1.1 This specification2 covers chromium-molybdenum alloy steel plates intended primarily for welded boilers and pressure vessels designed for elevated temperature service.
1.2 Plates are available under this specification in several grades having different alloy contents as follows:
|
|
Nominal |
|
|
|
Chromium |
Molybdenum |
|
Grade |
Content, % |
Content, % |
|
2 |
0.50 |
0.50 |
|
12 |
1.00 |
0.50 |
|
11 |
1.25 |
0.50 |
|
22 |
2.25 |
1.00 |
|
21 |
3.00 |
1.00 |
|
5 |
5.00 |
0.50 |
|
9 |
9.00 |
1.00 |
|
91 |
9.00 |
1.00 |
1.3 Each grade except Grade 91 is available in two classes of tensile strength levels as defined in the Tensile Requirements tables. Grade 91 is available only as Class 2. Grade 91 consists of two types, with Type 2 differentiated from Type 1 by requiring restricted composition for the enhancement of creep resistance.
1.3 Each grade except Grade 91 is available in two classes of tensile strength levels as defined in the Tensile Requirements tables. Grade 91 is available only as Class 2. Grade 91 consists of two types, with Type 2 differentiated from Type 1 by requiring restricted composition for the enhancement of creep resistance.
NOTE 1: Grade 911, previously covered by this specification, is now covered by Specification A1017/A1017M.
1.4 The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements.
1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents. Therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1What is ASTM A387 material?
ASTM A387 GR. 91 CL. 2 Alloy Steel Plates manufactured at the world's finest steel mills, this molybdenum-chrome based alloy has excellent resistance to greater working temperatures, making it the right selection for various applications like in gas, oil, chemical, and power generation.
2What is ASTM A387 equicalent to ?
ASTM A387 is a standard for chromium-molybdenum alloy steel plates for pressure vessels, with its most direct equivalent being ASME SA387, used interchangeably in the US, while international equivalents include European (EN 10028) and British (BS) standards, such as 13CrMo44 (EN 10028-2) for Grade 12, and DIN/EN grades for others like Grade 22 (10CrMo9-10). These materials are designed for high-temperature service, with specific grades like A387 Gr. 11, 12, 22, and 91 having corresponding ASME and European counterparts.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staffEmail: info@gneesteels.com
