A387 GR.11 CL.1 steel vs A387 GR.11 CL.2 steel

Both A387 GR.11 CL.1 steel and A387 GR.11 CL.2 steel are pressure vessel plates, Chromium-molybdenum alloy steel. A387 Grade11 Class 1 (A387 GR.11 CL.1) steel is a kind of chromium-molybdenum alloy steel plates intended primarily for welded boilers and pressure vessels designed for elevated temperature service.

Chemical Composition (%) of A387 GR.11 steel
A387 GR.11 CL.1 and A387 GR.11 CL.2 steel have the same chemical composition requirement. Below are the details of A387 GR.11 steel plate.

Mechanical properties of A387GR.11 plates
For material A387 GR.11 CL.2, "Class" for two classes of tensile strength levels. 387 GR.11 CL.1 and A387 GR.11 CL.2 steel has different tensile requirements. Below is the detailed mechanical properties for differences between A387 GR.11 CL.2 and A387GR.11 CL. 1.

Heat Treatment of A387GR.11 seel
The material A387GR.11 alloy steel plates shall be thermally treated either by annealing, normalizing and tempering, or, when permitted by the purchaser, accelerated cooling from the austenitizing temperature by air blasting or liquid quenching, followed by tempering. And the minimum tempering temperatures shall be 1150°F (or 620°C).

Application of A387 GR.11 alloy steel plates
The material A387 GR.11 CL.2 steel is also a kind of heat resistant steel, so it usually used in Petroleum and petrochemical industry, chemical equipment manufacturing enterprises, power station construction, boiler and pressure vessel manufacturing etc.

Under ASTM A387, there are also steel grades A387 Grade 5 Class 1, A387 Grade 5 Class 2, A387 grade 9, A387 grade 12 Class 1, A387 grade 12 Class 2, A387 grade 22 Class 1, A387 grade 22 Class 2, A387 grade 91. They have similiar application to A387 Gr 11 steel.