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Anonymous Poster #1

Rework of Hardness for FG 260 Material During Stress Relieving

07/15/2018 11:16 AM

We have stress relieved FG260 crankcase of wall thickness 22 mm at 720 degrees centigrade for 1 hours 30 minutes, due to which the BHN hardness value has reduced from 210 to 150 BHN. Electric furnace is used for Stress relieving .

We want to rework the same to get a minimum BHN of 200. Please suggest the rework procedure / process

Thanks in advance,

Ravi Bagewadi
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SolarEagle
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#1

Re: Rework of hardness for FG 260 material during stress relieving

07/15/2018 12:06 PM

Your aging temp seems high.....recommended 520 to 580C...and your time seems too short, recommended @ 4-6 hrs....

https://www.castingquality.com/wp-content/uploads/2010/07/grey-cast-iron-composition.pdf

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SolarEagle
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#3
In reply to #1

Re: Rework of hardness for FG 260 material during stress relieving

07/15/2018 12:31 PM

Found this...

https://www.ductile.org/didata/Section7/7intro.htm

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ravi bagewadi
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Location: crankshaft producing hub in belgaum,karnataka,india
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#4
In reply to #1

Re: Rework of hardness for FG 260 material during stress relieving

07/15/2018 12:40 PM

thank you Sir,

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lyn
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#2

Re: Rework of hardness for FG 260 material during stress relieving

07/15/2018 12:12 PM

This guide should help.

Heat Treating Guide - Dura-Bar

This is a much more detailed guide

Effect of heat-treatment on the mechanical properties of ... - NIST Page
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ravi bagewadi
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Location: crankshaft producing hub in belgaum,karnataka,india
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#5
In reply to #2

Re: Rework of hardness for FG 260 material during stress relieving

07/15/2018 10:24 PM

Thank you very much .

I will try to reduce temp to 580 Deg, and adopt soaking time of 2.5 - 3 hrs for 22 mm wall thickness.

And for rework use 850 Deg. 1 HR soaking and forcibly cool with fan
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PWSlack
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#6
In reply to #5

Re: Rework of hardness for FG 260 material during stress relieving

07/16/2018 3:03 AM

Once it is done and proven to work, write it up as a production standard for others to follow.

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