Heat affected bluing

v35v35 Member Posts: 13,200
edited February 2015 in Ask the Experts
Does anyone know temps above which salt and rust bluing will discolor?


  • 49 harley49 harley Member Posts: 112 ✭✭
    edited November -1
    IIRC correctly, From PGS days, anything over 315 degrees. Normal was approx. 285, higher for Winnie's with nickel content.
  • nononsensenononsense Member, Moderator Posts: 10,542 ******
    edited November -1

    Are you asking about environmental temps after the product is blued or process temps for accomplishing the blue?

    The process temps are as '49 harley' stated.

  • MG1890MG1890 Member Posts: 4,649
    edited November -1
    The temps are only correct for salt bluing. Rust bluing never exceeds 212F.. Don't know what temp it discolors at.
  • MIKE WISKEYMIKE WISKEY Member Posts: 9,245 ✭✭✭
    edited November -1
    most steel will start to dis-color at about 450 deg. f (blued or not) this is called tempering (temp.) it will start as a light yellow (luger 'straw' colored trigger/springs)and progress to brown to light blue (think colt springs) and finaly dark blue.
Sign In or Register to comment.