1.Tempering color of carbon steel seamless steel tube during heat treatment
Light yellow: 200 ℃; Brown: 240 ℃; Purple: 260 ℃; blue purple: 280 ℃; blue: 300 ℃; blue gray: 350 ℃; gray: 400 ℃.
2.Tempering color of stainless steel seamless steel tube during heat treatment
Light wheat yellow: 290 ℃; wheat yellow: 340 ℃; light reddish brown: 390 ℃; light red: 450 ℃; light blue: 530 ℃; dark blue: 600 ℃.
2.Tempering color of low alloy seamless steel tube during heat treatment
Light wheat yellow: 225 ℃; wheat yellow: 235 ℃; light reddish brown: 265 ℃; light red: 280 ℃; light blue: 290 ℃; dark blue: 315 ℃.
Knowing that tempering color and temperature have a degree, then what is it related to? Ignoring the key premise of time, of course, as long as the color is separated, you can accurately understand the temperature of heat treatment.
Tips:ASTM A53 pipe is intended mechanical and pressure applications, but is also acceptable for and widely used in air, water, steam, and gas lines.
In Oil and Gas, A53 grade pipes are used in the structural and non-critical applications. They are not used in hydrocarbon services or any services that involve pressure and temperature.