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Chome Molybdenum steel plate, often known as Chrome Moly, 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.
All Chrome Moly plates are killed and thermally treated as required by ASTM A387 which also specifies minimum and maximum quantities of the following elements in the steel: chemical requirements for carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, nickel, vanadium, columbium, boron, nitrogen, aluminum, titanium, and zirconium.
A387 plate has to undergo product, chemical and tensile testing (which is documented in the MTC or material test certificate) – with specific requirements that have to be met for tensile strength, yield strength, and elongation.
Chrome Moly plate is popular in the oil and gas industry for on and offshore production facilities because of the alloy’skey properties.
High Tensile Strength at High Temperatures
A387 Chrome Moly steel has a much higher heat resistance than other carbon steels and it is thus exceptionally useful for applications where hot fluids or gases are being processed at high temperatures.
The chromium and the molybdenum are the key alloying elements. They provide many of the properties of stainless steel at a reduced costs. (typically A387 alloy steel has 0.5% t0 5% Chromium content as opposed to 16% in stainless steel)
- ASTM A387 Grade 12 Class 2, 1% chromium – 1/2% Molybdenum – Effective working temperature up to 560°C
- ASTM A387 Grade 11 Class 2, 1.25% chromium – 1/2% Molybdenum – Effective working temperature up to 575°C
- ASTM A387 Grade 22 Class 2, 2.25% chromium – 1% Molybdenum – Effective working temperature up to 600°C
Excellent Corrosion and Oxidation Resistance
The Molybdenum component in the SA387 alloy, as well as increasing the tensile strength at high temperatures, also provides high resistance against oxidation and corrosion by increasing the lattice strain of the steel structure. This effectively stops the corrosive agents from dissolving the iron out of the steel structure.
More About Chrome Moly Plate
ASTM A 387, ASME SA 387, is one of our most pressure vessel steel products. It is a low alloy pressure vessel quality steel for high temperatures. We have a wide range of plate sizes available and thicknesses range from 6 – 100mm
We have a number of pages of detailed information about chrome moly steel, as well as a number of supplementary pages around the site that provide further information on A387 but which are applicable to a number of steel grades.
This is the home page. An overview of SA 387 is given on the general page whilst the comparison and equivalents page provides a table of equivalent grades to SA 387. On the characteristics page we provide chemical and mechanical data about SA 387 and the individual grades – Gr.5, Gr.9, Gr.11, Gr.12 and Gr.22.
Finally on the last two pages we have summary sample MTC’s so that you can see the quality of the steel that we supply (on the Test Certificates Page) and a non-exhaustive list of the plate dimensions and thicknesses that are available.
If you need to know anything else please send us an e-mail and we will do our best to assist you.