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JDCRAWFORD5
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Engineering Fields - Mechanical Engineering - New Member

Join Date: Oct 2014
Posts: 3

Metallurgy

02/20/2015 1:31 PM

I'm looking for someone that can enlighten me as to what excess nickel (>.10%) can cause in ANSI 4140 steel. Nickel is not called out as an alloy of 4140, but recently we have been seeing it show up in the mill specs. There have been some issues with cracking during heat treat and I'm just curious if this may play a factor.
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lyn
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Join Date: Oct 2008
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#1

Re: Metalurgy

02/20/2015 1:47 PM

I expect that it may cause brittleness.

But, I'm no metallurgist, and the opinions of unknown, un-vetted, total strangers from an anonymous forum would get you thrown out of my office in a heartbeat if you tried to get me to take anything you got there as an expert opinion.

The best way to keep from looking like a fool is to hire a metallurgist , with credentials.
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JDCRAWFORD5
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#2
In reply to #1

Re: Metalurgy

02/20/2015 2:02 PM

Agreed, this information will not, by any means serve an expert analysis. As a company we have already sent the material samples out for full analysis from a lab, I am just curious to see if others have observed similar issues, or possibly offer insights into other issues this may cause.
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lyn
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#3
In reply to #2

Re: Metalurgy

02/20/2015 4:26 PM

ASTM A434 (A29) Grade 4140 - Search Steel allows up to .5%.

Most allow none.

Co figure.
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James Stewart
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Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

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#7
In reply to #3

Re: Metalurgy

02/23/2015 11:52 AM

http://www.atlassteels.com.au/documents/Atlas4140.pdf

This link was a small entry within the link you put up, Lyn. I could find no reference to Ni residual in the steel on either. I suspect OP needs to talk to his vendor about this, or if he is the one forging this (from scrap?) needs to isolate the contaminant source from the main supply.

However OP is still advised to (1) contact a metallurgist with actual credentials, and (2) follow the metallurgist's advice, and none of ours.

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sb
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Join Date: Mar 2007
Posts: 2547
Good Answers: 103
#4

Re: Metallurgy

02/21/2015 6:20 AM

Nickel does increase hardness, brittleness and difficulty in welding, but not at this level of low fraction percentage. Something else is likely to be wrong. And what is the heat treatment? May be something going wrong in that? And Ni in equivalent is quite low, so it won't change Ceq prominently either.

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Bluestone
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#5

Re: Metallurgy

02/21/2015 7:57 AM

Many years ago I acquired a handbook titled, "Modern Steels & Their Properties", written by Bethlehem Steel that I've found very beneficial in explaining the effects of alloying elements in carbon and alloy steels. It also includes the composition, ladle analysis and thermal treatment of standard and specialty steels. A quick Google check revealed that this book is still available for purchase or in free libraries.

You might also find it useful.
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calasus40
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Join Date: Mar 2014
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#6

Re: Metallurgy

02/23/2015 8:30 AM

My suggestion would be to contact a metallurgist for an expert analysis to ensure expert knowledge.
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Users who posted comments:

Bluestone (1); calasus40 (1); James Stewart (1); JDCRAWFORD5 (1); lyn (2); sb (1)

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