AISI 4145 or SAE 4145 confusion...
AISI 4145 or SAE 4145 confusion...
(OP)
I'm not sure if I'm posting this in the right place so please correct me.
Our company in the oil industry use various "4145" materials, some from bar and some from tubing to machine as end subs for test pieces and end subs/parts for some downhole tooling. We have been having issues with our materials specs where suppliers are often asking for comncessions as our spec is too tight and often confusing. I have been tasked with getting to the bottom of checking and revising the mats specs in this area.
In the first instance I am having difficulty finding a spec for 4145. Its seems that SAE now control and publish this under J404? Is this correct? What is the definitive source for 4145 spec?
The problem is that we get offered 4145 mod, which as far as mech props go often meet our needs, but this appears to be a proprietary spec rather than a standard as I can find no ref to it in SAE.
So I wonder if anyone has any knowledge/info they could share with me so I can try and steer this in the right direction.
Our company in the oil industry use various "4145" materials, some from bar and some from tubing to machine as end subs for test pieces and end subs/parts for some downhole tooling. We have been having issues with our materials specs where suppliers are often asking for comncessions as our spec is too tight and often confusing. I have been tasked with getting to the bottom of checking and revising the mats specs in this area.
In the first instance I am having difficulty finding a spec for 4145. Its seems that SAE now control and publish this under J404? Is this correct? What is the definitive source for 4145 spec?
The problem is that we get offered 4145 mod, which as far as mech props go often meet our needs, but this appears to be a proprietary spec rather than a standard as I can find no ref to it in SAE.
So I wonder if anyone has any knowledge/info they could share with me so I can try and steer this in the right direction.





RE: AISI 4145 or SAE 4145 confusion...
Check here for SAE 4145 spec.: http://www.steel-grades.com/Steel-grades/Carbon-st...
RE: AISI 4145 or SAE 4145 confusion...
RE: AISI 4145 or SAE 4145 confusion...
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RE: AISI 4145 or SAE 4145 confusion...
RE: AISI 4145 or SAE 4145 confusion...
Secondly the links above from micalbrch are from a chinese steel supplier, whislt I thank you for googleing for me, I appreciate your help. I can google all kinds of internet refs to 4145 but I kinda want the definitve spec..
RE: AISI 4145 or SAE 4145 confusion...
RE: AISI 4145 or SAE 4145 confusion...
RE: AISI 4145 or SAE 4145 confusion...
I have never seen much point in nitpicking the difference between 4145/4145H/4145M. Anyone who understands the reasons for this does not have a problem with the chemistry being slightly higher in Mn, Cr, and/or Mo. Those that don't understand the reasons, well, they don't understand so there isn't much to be gained by arguing with them. As has been said, it is much more important that the material possesses the required mechanical properties at the required depth below the surface. The chemical analysis just allows the processor to get there.
rp
RE: AISI 4145 or SAE 4145 confusion...
RE: AISI 4145 or SAE 4145 confusion...
C: 0.42-0.48
Mn: 0.65-1.20
Cr: 0.80-1.45
Mo: 0.15-0.50
Standard levels for the rest. Have a separate spec for 4140/42 tubes (mainly so they don't try to use 4140 bar).
Make it a requirement that each heat & each size have a mechanical test performed for each heat treating run. And be specific about the location (pitch diameter of the smallest thread).
Also make it a requirement that someone in your organization sign off on the test results (preferably, you). Also, put in your spec who to contact (again, preferably you) if there are any technical questions to the spec.
Your supply chain wants a spec they can give a supplier that will tell the supplier exactly what is needed so your buyer can give it to a bunch of different vendors and choose the one with the lowest price and/or best delivery. Your buyer does not want the vendor to call him back with any questions. Your buyer does not care if the material will be suitable for the job, only that he gets a good price for it.
rp
RE: AISI 4145 or SAE 4145 confusion...
RE: AISI 4145 or SAE 4145 confusion...
I would approach this a little differerntly. Since mechanical properties are what you really are trying to obtain, I would specify to commercial specifications that include required mmechanical properties, which are going to be the result of heat treatment and processing for individual alloys. For bar as an example, you should look into the classes within ASTM A434. These are classified by tensile properties, and you can call up a suppliemental requirement for your hardness requirements (though note that Charpy is not part of either the spec or listed as a callable supplemental requirement). Composition can be amongst alloy steel series listed (including 4100). I suspect you will have more success finding the right supplier by specifying in this manner.
RE: AISI 4145 or SAE 4145 confusion...
rp
RE: AISI 4145 or SAE 4145 confusion...