4130 & 4140

SFI Gray is a leading supplier of quality 4130 and 4140 alloy steel plate

Ryerson flame cut plate

We carry a vast on-site inventory with 4130 and 4140 alloy steel plate of varying sizes and thicknesses. We can cut 4130 and 4140 from ¼” up to 8” thick. With our large selection of products, we can provide immediate quotes and service jobs with tight lead times.

4130 steel

4130 alloy steel is a chrome alloy steel with medium carbon content. 4130 is readily machinable, possesses strong internal toughness, and offers excellent weldability and ductility.

4140 steel

Alloy 4140 is one of the most popular medium carbon chromium-molybdenum (CR-MO) alloy steel plates, with excellent response to quenching and tempering and moderate hardening capabilities.


Our 4140 steel plate offers uniform, consistent response to heat treatment, superior cleanliness, internal soundness and improved service life for machined parts.


4140 alloy plate is widely used for general purpose industrial machining, and particularly well-suited when high resistance to fatigue and or impact is required.


Our plate inventory is stored in as-rolled condition, chemically treated, and ready for heat treatment. We can heat treat as necessary, or ship it to you as-is.


 If your job requires a specific steel grade that is not in our inventory, we can acquire the proper thickness and grade to meet your specifications through our global network of over 100 facilities.