"Blue" Stainless Steel.....
"Blue" Stainless Steel.....
(OP)
I'll start by saying this is not my idea. Our customer is having trouble identifing btw two parts. They wondered if we could blue the one made of stainless steel (7C27Mo2:SAE420).
The problem is that we dont want to lose the temper on this material since the high hardness (~535HV) is important along with the high strength for fatigue.
Can anyone suggest an (atmosphere, temperature, quenchant) that can solve our problem. I know I can blue the steel, I just think that 6-800F will temper it out.
thanks
nick
The problem is that we dont want to lose the temper on this material since the high hardness (~535HV) is important along with the high strength for fatigue.
Can anyone suggest an (atmosphere, temperature, quenchant) that can solve our problem. I know I can blue the steel, I just think that 6-800F will temper it out.
thanks
nick





RE: "Blue" Stainless Steel.....
I looked for SAE420! I must have the wrong book! Maby ASTM 420 ?
But 7C27Mo2 is a martensite Stainless Chromium Steel.
So Annealing is around 1500°F to 1600°F and Process anneal is from 1200°F to 1400°F. But close to 800 I would wory about Carbides (precipitation from 900°F to 1700°F) that would realy fragilise your Mart SS. Also there is a rapide decline in mechanical properties passed 900°F.
What type of material does he have to I.D. ? Maby we can find something smart!
Good luck
RE: "Blue" Stainless Steel.....
RE: "Blue" Stainless Steel.....
Flores
RE: "Blue" Stainless Steel.....
Any way thanks guys.
This is a flexing Valve application There is not a chance of changing materials. I cannot etch/mark the surface in any way. (Fatigue)
TEV-- Hot permagnate? do you mean potassium permagnate? Should I dissolve it in water or do I need to melt a solid compound? 90-120C higher? I dont really wnat to go above 300C....
nick
RE: "Blue" Stainless Steel.....
Yes, potassium permanganate dissolved in water, try 50C. This is a strong oxidizing solution.
RE: "Blue" Stainless Steel.....
nick
RE: "Blue" Stainless Steel.....