Alloy Steel Plates Made up of Chromium Molybdenum Alloys. This Steel is Used in Boilers and Pressure Vessels for Power Plants.
It is a lot heavier than aluminium but has far less corrosion resistance than Stainless steel. The reason it is so popular is that chrome moly steel plate is strong and formable. So it can be easily formed into pipes and fittings and rolled into pressure vessels and boilers without either the cost or the cracking that is seen in other materials
Chome Moly steel plate, formally known as Chrome Molybdenum, is usually sold as ASTM A387 or ASME SA387. A387 is alloy steel plate that is designed for use in pressure vessels, process vessels and boilers operating at high temperatures.
There are ten grades of Chromium Molybdenum steel plate (A387) 2, 12, 11, 22, 22L, 21, 21L, 9 and 91 specified by ASTM/ASME, though A387 grades 2, 21, 21L and 22L are generally not available at steel stockholders and have to be ordered in mill quantities. Chrome moly grades 9 and 91 are also less popular and are often difficult to obtain.
We also have the EN10028-3 equivalents to A387 available – 16Mo3, 13CrMo4-5, 10CrMo 9-10 and 12CrMo 1.5.
CHROME MOLY STEEL PLATE GRADES AVAILABLE EX-STOCK
ASTM/ASME A387 Grade 5 Class 2
ASTM/ASME A387 Grade 11 Class 2
ASTM/ASME A387 Grade 12 Class 2
ASTM/ASME A387 Grade 22 Class 2