ASTM A387 Grade 11 Class 1 is a chromium-molybdenum alloy steel plate used for high-temperature pressure vessels and boilers, offering excellent creep resistance, oxidation resistance, and good weldability due to its 1.25% Cr and 0.5% Mo content, supplied in a normalized and tempered (N+T) condition for demanding oil, gas, and petrochemical service.
Chemical Composition and Mechanical Property
| Grade | Chemical Composition(%) | ||||
| C | Mn | Si | P max | S max | |
| A387 Grade 11 Class1 (A387GR11CL1) | 0.04-0.17 | 0.35-0.73 | 0.44-0.86 | 0.035 | 0.035 |
| Grade | Mechanical Property | ||||
| Tensile Strength(MPa) | Yield Strength(MPa) min | % Elongation in 2 in.(50mm) min | Impacting Test Temperature(°C) | ||
| A387 Grade 11 Class1(A387GR11CL1) | 415-585 | 240 | 22 | -20,40,-60 | |
Key Applications
Oil & Gas: Reactor shells, hydrotreating/hydrocracking units, high-temperature storage tanks, and piping in refineries.
Petrochemical Industry: Chemical reactors, storage vessels, and process equipment exposed to high temps.
Power Generation: Boiler drums, headers, and pressure parts in power plants.
General Pressure Vessels: Fabricating large pressure vessels and components for various industrial processes at elevated temperatures.
If you have project requirements for ASTM A387 Grade 11 Class 1, we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email:beam@gneesteelgroup.com.
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.
What is the composition of A387 steel?
Composition: ASTM A387 steel plates typically contain chromium (up to 9% or more) and molybdenum (up to 2.25% or more), which enhance their strength and corrosion resistance at high temperatures.