Shaft steel for use at -35 deg C
Shaft steel for use at -35 deg C
(OP)
In need of assistance!
Currently we use steel 817M40T, otherwise known as EN24T (sorry about UK steel references) for shafts in our machines. Diameters from 2" to 6".
We have an application where the machines will be used down to -35 deg C.
1) would this steel be OK?
2) if not, any suggestions for a suitable steel?
Thanks.
EN24T
C 0.36/0.44
Si 0.10/0.35
Mn 0.45/0.70
P 0.04 max
S 0.05 max
Cr 1.0/1.4
Ni 1.3/1.7
Mo 0.10/0.20
T = 55/65 T/in2
Currently we use steel 817M40T, otherwise known as EN24T (sorry about UK steel references) for shafts in our machines. Diameters from 2" to 6".
We have an application where the machines will be used down to -35 deg C.
1) would this steel be OK?
2) if not, any suggestions for a suitable steel?
Thanks.
EN24T
C 0.36/0.44
Si 0.10/0.35
Mn 0.45/0.70
P 0.04 max
S 0.05 max
Cr 1.0/1.4
Ni 1.3/1.7
Mo 0.10/0.20
T = 55/65 T/in2





RE: Shaft steel for use at -35 deg C
RE: Shaft steel for use at -35 deg C
You can buy it "off the shelf" in this quality in the UK.
RE: Shaft steel for use at -35 deg C
You need to define your impact requirements at -35 deg C (CVN of ? at -35 deg C). Once this is done, you can impact test this material to assure conformance. The Ni content of the above will be beneficial for low temperature service.
RE: Shaft steel for use at -35 deg C
If only I knew
It's a simple rotating shaft subject to torsion and bending from what should be a pretty uniform load. About three changes in diameter and two keyways.
Anyone know any published data on this material at low temperature?
RE: Shaft steel for use at -35 deg C
20 ft-lbs or 27 Joules at -35 deg C. Evaluate shaft materials using the above.
RE: Shaft steel for use at -35 deg C
RE: Shaft steel for use at -35 deg C
Save water Drink Beer
RE: Shaft steel for use at -35 deg C
RE: Shaft steel for use at -35 deg C
The Charpy V toughness measure at that hardness may either drop fairly sharply between -40 and -100 deg F (-40 to -75 deg C) from 75 ft-lb to 35 ft-lb (fig. 3.0335) or it may drop slowly from 95 ft-lb to 80 ft-lb (fig. 3.0336). Either way it still looks quite healthy at -30 deg C/-22 deg F. NB: it's fairly sensitive to phosphorous content.
The notched tensile stength remains very healthy down to -200 deg F.
For material at 215 ksi Ftu the fracture toughness drops from about 65 ksi.rt" at 0 deg F to about 45 ksi.rt" at -100 deg F. Fracture toughness at room temperature of 125 ksi material should be above 140 ksi.rt".