SCC of 4140
SCC of 4140
(OP)
Hi All,
I've heard anecdotal evidence that 4140 steel suffers from Stress Corrosion Cracking in coal conveyor applications. Can anyone provide any information about this?
I assume that 4140T would be worse than 4140R, but does R suffer from severe SCC?
I've heard anecdotal evidence that 4140 steel suffers from Stress Corrosion Cracking in coal conveyor applications. Can anyone provide any information about this?
I assume that 4140T would be worse than 4140R, but does R suffer from severe SCC?





RE: SCC of 4140
RE: SCC of 4140
Start by googling, but I'm sure metengr is right about fatigue - this equipment surely sees a lot of mechanical abuse.
RE: SCC of 4140
Low --> UTS > 180 ksi (1240 MPa, 39 HRC).
Good --> UTS 160-180 ksi (1100-1240 MPa, 34-39 HRC)
Excellent --> UTS < 160 ksi (1100 MPa, 34 HRC)
SCC for martensitic steels is most commonly associated with environments with chloride ions such as seawater/offshore, automobiles in contact with de-icing salts, etc.
RE: SCC of 4140
Bottom line , keep your strength as low as fatigue stresses permit.
RE: SCC of 4140
RE: SCC of 4140
http://www.questek.com/ferrium-m54.html
Jim