Creep data for S235JR/A284 @ 900¦C 1

[Lilleby]

I would greatly appreciate it someone could recommend a publication / journal / research institute / material testing facility that has documented the creep behaviour of S235JR /ASTM A284 or similar steels at 800 + °C.

I know this is a rather special request, but I would like to model the creep behaviour of a steel bar partially enclosed in a carbon block at 900°C and have up to this point not found any relevant data i.e. nothing above ~600°C.

All help will be greatly appreciated.

Regards
Anders

 

[metengr]

Lilleby;
At 800 deg C + exposure temeprature of carbon steel, I would be more concerned with elevated temperature mechanical properties, like tensile strength or stress rupture versus creep deformation behavior. In other words, exposure at 800 or 900 deg C for carbon steel will result in failure from lack of tensile strength long before creep deformation becomes a concern.

http://www.mace.manchester.ac.uk/pr...HotRolledCarbonSteel/mechanicalProperties.htm

 

[TVP]

Agreed, 800 C is too high a temperature for conventional carbon steels with regards to creep. Stress rupture will definitely be the failure mode. Keep in mind that this is very close to the austenitizing temperature, meaning that the stress to cause deformation will be of the order of 10 MPa.

 

[Lilleby]

First of all, thank you for showing an interest.

I am not afraid of the component failing during operation, I just want to model the system in ANSYS to be able to optimize it and deduct indirect loads from the deformation of the steel bar. I know how large the deformation is, I just need some relevant material data to estimate the loads.

Parts of this bar operates way above the austenitic temperature, with temperatures in the deformed volume ranging from 950 to 600°C. I should also point out that the rate of deformation is very low. The resulting equivalent plastic strain after 1 year of operation is about 0.12 mm/mm. Based on the deformation and employing experimental material data (some of it reproduced below)

Regarding the yield strength of the material, this has been tested according to NS-EN10002-1 with the following results. (Engineering stress and engineering strain)

RP0.2: 0.2% offset yield strength Rm: Tensile strength Agt: Strain at maximum load
# Temp [°C] Rp0.2 Rm Agt
4-8 600 96 118 3.8
4-9 700 76 82 4.5
4-10 800 58 64 7.5
4.12 900 50 62 6.4