Rework of Hardness for FG 260 Material During Stress Relieving

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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 Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33280 Good Answers: 1810	#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 __________________ All living things seek to control their own destiny....this is the purpose of life
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33280 Good Answers: 1810	#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 __________________ All living things seek to control their own destiny....this is the purpose of life
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ravi bagewadi Associate Join Date: Apr 2009 Location: crankshaft producing hub in belgaum,karnataka,india Posts: 38 Good Answers: 1	#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 Guru Join Date: Oct 2008 Posts: 42377 Good Answers: 1691	#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 Associate Join Date: Apr 2009 Location: crankshaft producing hub in belgaum,karnataka,india Posts: 38 Good Answers: 1	#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 Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32085 Good Answers: 838	#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. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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lyn (1); PWSlack (1); ravi bagewadi (2); SolarEagle (2)

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