high yield corrosion resistant steel
high yield corrosion resistant steel
(OP)
Hi,
I'm looking for a steel (probably stainless) that has corrosion resistant properties equal to or greater than that of 316 and a yield stress of 200ksi or greater. Obviously it will be a treated material. Is there anything that fits the spec, preferably something with 20% or less nickel?
Phil
I'm looking for a steel (probably stainless) that has corrosion resistant properties equal to or greater than that of 316 and a yield stress of 200ksi or greater. Obviously it will be a treated material. Is there anything that fits the spec, preferably something with 20% or less nickel?
Phil
RE: high yield corrosion resistant steel
I would suggest a Duplex steel such as 2205.
JLAU
RE: high yield corrosion resistant steel
RE: high yield corrosion resistant steel
RE: high yield corrosion resistant steel
The application is for use in a condensing natural gas boiler. Do you know of any sources that compare the corrosion resistance of the 17/4PH and CA6NM against 316? Another possibility is a Nitronic, but I haven't seen any with high yields and I haven't seen any data on their corrosion resistance.
Phil
RE: high yield corrosion resistant steel
A 13-8 PH steel will get to around 205 ksi yield (17-4 peaks around 180), but the problem you run into is susceptability to other forms of corrosion/degradation at this strength level. Many HSLA steels, PH steels, and maraging steels become increasingly sensitive to SCC and hydrogen embrittlement (in both fresh and seawater) once the yield strength reaches about 190 ksi. As stated previously, more information on your application would help narrow the scope of the selection field.
Andy
RE: high yield corrosion resistant steel
What is the corrosive medium that the alloy has to resist?
Gas? Liquid? At what temperatures? Is any stress involved?
Does fatigue resistance matter? What other service conditions? Steady or intermittent exposure?
RE: high yield corrosion resistant steel
RE: high yield corrosion resistant steel
RE: high yield corrosion resistant steel
Is the hoop stress in the boiler a result of the medium it contains only? (i.e. not internally pressurized) If this is the case, is your desire for high yield strength just an effort to contain the potential explosion?
How are you limited for space? If you have lots of space available, then how about making the boiler out of thin 316, and then build a seperate explosion containment chamber around the boiler. All you would need then is material designed for withstanding explosive force, and corrosion would not be an issue.
Andy
RE: high yield corrosion resistant steel
Two further thoughts:
1. Since you need to be "thin", I wonder whether total weight has to be kept to a minimum. If so, you might use a rotationally cast cylinder for your containment to increase specific hoop strength.
2. Would suggest you visit http://www.nidi.org and download paper # 1318 "Corrosion Resistance of Nickel Containing Alloys in Sulphuric Acid" This contains service experience as well as detailed selection charts.