Steel chemical Composition is 4340 or not??
Steel chemical Composition is 4340 or not??
(OP)
C 0.4006 /Si 0.2819 / Mn 0.6389 / P 0.0231 / S 0.0045 / Cr 0.9655 / Mo 0.1468 / Ni 0.0309 / V 0.0126 / Al 0.0081 / Cu 0.0094 / Ti 0.0047 /Nb 0.0008 / Pb 0.0018 / As 0.0026 / Co 0.0120 / Fe Balance ( % Weight)
This is analysis result.What is the kind of metal that i can identify for this ?
This is analysis result.What is the kind of metal that i can identify for this ?





RE: Steel chemical Composition is 4340 or not??
Slightly outside the range for 4140H, but within the check analysis tolerance.
Do you know if this was made to AISI limits?
rp
RE: Steel chemical Composition is 4340 or not??
RE: Steel chemical Composition is 4340 or not??
This is from failure pump shaft in my plant. Now i try to find the root cause.
RE: Steel chemical Composition is 4340 or not??
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein
RE: Steel chemical Composition is 4340 or not??
RE: Steel chemical Composition is 4340 or not??
RE: Steel chemical Composition is 4340 or not??
It probably would harden in water. Find out what the design intended.
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein
RE: Steel chemical Composition is 4340 or not??
how to increasing strength on shaft if base on material improvement ??
RE: Steel chemical Composition is 4340 or not??
Are you really sure about the statements below?
First off, viewing the fracture is only part of the solution. You have no specifics on the type of pump, the environment, etc. I would suggest you send this to a metallurgical lab that can perform a proper failure analysis.
Once you have confirmed the failure mechanism, the next step is to determine the root cause of the failure. Here is where you need to develop a checklist of operating conditions, materials of construction, etc. Once you have established the root cause, you can decide on corrective action plans - change in shaft material, change in heat treatment, possible re-design of shaft transitions, etc.
RE: Steel chemical Composition is 4340 or not??
RE: Steel chemical Composition is 4340 or not??
I agree with Met about the need for a proper analysis; a but of guys on the internet looking at fuzzy pics can't really make a definitive analysis.....
RE: Steel chemical Composition is 4340 or not??
RE: Steel chemical Composition is 4340 or not??
Those pictures are pretty conclusive evidence that failure occurred by fatigue. Flat initiation/propagation zone, large ratchet marks near the point of final failure all scream fatigue.
RE: Steel chemical Composition is 4340 or not??