Grades of Rust for Steel Structure

Dear Readers,

 

Rust is having important role to finalaise the surface preparation for steel structure before painting. Four Rust grades, designated A, B, C and D respectively, are specified. The rust grades  are defined as follows

 

Grade-A : It is mainly adhering mill scale, but little rust

Grade-B : It is rusting and flaking of mill scale has begun

Grade-C : The mill scale is rushing away, with slight pitting

Grade-D : The mill scale has rusted away, with general pitting

 

Rust Grade photographs are as follows

GRADE-A

 

Steel Surface largely covered with adhering mill scale but little, if any, rust.

 

 

  

 

 

 

 

 

GRADE-B

 

Steel Surface which has begun to rust and form which the mill scale has begun to flake. 

 

 

 

 

 

GRADE-C

 

Steel Surface on which the mill scale has rusted away or from which it can be scraped, but with slight pitting visible under normal vision.

 

 

 

GRADE-D

Steel Surface on which the mill scale has rusted away and on which general pitting is visible under normal vision.

 

 

 

For More Details about Surface Preparation of Structural Steel Click Here