ASTM A387 Grade 11 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate for high-temperature pressure vessels and boilers, containing roughly 1.25% chromium and 0.5% molybdenum for superior strength, creep resistance, and oxidation resistance in harsh environments like oil & gas, refining, and power generation, typically supplied normalized and tempered. Class 1 signifies specific tensile strength levels, distinguishing it from Class 2, with this grade emphasizing purity and flaw detection for demanding applications.
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A387 Gr.11 CL.1Chemical Composition |
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Grade |
The Element Max (%) |
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C |
Si |
Mn |
P |
S |
Cr |
Mo |
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A387 Gr.11 Cl.1 |
0.04-0.17 |
0.44-0.86 |
0.35-0.73 |
0.035 |
0.035 |
0.94-1.56 |
0.40-0.70 |
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Grade |
A387 Gr.11 CL.1Mechanical Property |
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Thickness |
Yield |
Tensile |
Elongation |
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A387 Gr.11 Cl.1 |
mm |
Min Mpa |
Mpa |
Min % |
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t≦50 |
240 |
415-585 |
22 |
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50<t≦200 |
240 |
415-585 |
19 |
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Equivalent steel grade of A387 Gr.11 Cl.1 |
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Europe |
Belgium |
Germany |
France |
Italy |
Sweden |
India |
Japan |
U.K |
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621 gr. A,B |
Product Usage & Application :
Usefull in Paper & Pulp Companies
Usefull in High Pressure Applications
Usefull in Oil and Gas Industry
Usefull in Chemical Refinery
Usefull in Pipeline
Usefull in High Temperature Application
Usefull in Water Pipe Line
Usefull in Nuclear Power Plants
Usefull in Food Processing and Dairy Industries
Usefull in Boiler & Heat Exchangers
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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 staff.
1.What is ASTM A387 Grade 11 equivalent to?
ASTM A387 grade 11 equivalent steel is ASME SA387 grade 11. ASTM A387 grade 11 covers A387 grade 11 class 1 and A387 grade 11 class 2, which are equivalent to ASME SA387 grade 11 class 1 and SA387 grade 11 class 2 respectively.
2.What is A387 grade 11 material?
The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum intended primarily for use in welded boilers and pressure vessels designed for elevated temperature service. SSAB can supply A387 Grade 11 to the tension test requirements for Class 1 and/or Class 2.
3.What temperature is ASTM A387 Grade 11 Class 1?
In the lower end of the temperature range SA 387 Gr 11 (1150 °F min tempering temperature) , and SA 387 Gr 22 (1250 °F min tempering temperature) are used. These grades can be specified in either class 1 or 2 and can also be provided in the Normalized & Tempered or Quenched and Tempered.