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Hello All,

i am trying to obtain the mechanical properties of the CA40 with no success, our chemistry is c 0.38, Si 1, mn 0.8, p 0.04 max, s 0.03 max, Ni 0.5 max, cr 12.5 and mo 0.5 max. 

we are chasing Yield 485, tensile 690, elongation 15,  ROA 25 and max HB of 269. 

I have tried many Heat treatment cycles with no success and wondering if there are any suggestions. 

Please let me know what additional information would help. 

Thanks in advance

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Matthew Dunford
Casting Simulation Specialist
White Industries
Dalby Queensland
0429262672
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Matthew,

Can you supply any of your data? This would include heat treat details, and the resulting properties? Are you attempting to soften the material... or harden it?

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David Coulston
Niles MI
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Hey David,

So this CA40 is a 420ss in wrought form. Much harder than a CA15 or a 410 in wrought.   

If you are trying to achieve the annealed properties on the low end of the spectrum how have you been annealing  it?   Usually  I pull the TTT or better yet the CCT diagrams but basically after you get up into 1550 to 1650F for your castings then you need to really slow cool or furnace cool and if you thermocouple a heat sink max thickness of casting slow cool ma 40F per hour max.   That's a start and see where you are at then dial it in from there.   This is 2 part problem 1)hold time at heat and 2) cooling rate very slow.  You may have to go a little slower as the CA40 is so hardenable.  Also because of casting segregation make sure you are at heat say 1625F and hold it say 1 to 2 hours to start for economics and then add time if you need but usually if you are at heat for that time you should  be good.   I used load thermocouples for aerospace work but as soon as you find the temperature and time to process you can work off furnace.  

Good luck

Wayne Terwilliger 

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Wayne Terwilliger
Metallurgical Engineer
Shelby Township MI
(248) 410-7715
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Something similar to this...

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David Coulston
Niles MI
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Original Message:
Sent: 02-14-2024 09:35
From: Wayne Terwilliger
Subject: ASTM A743 CA40 Mechanical Properties

Hey David,

So this CA40 is a 420ss in wrought form. Much harder than a CA15 or a 410 in wrought.   

If you are trying to achieve the annealed properties on the low end of the spectrum how have you been annealing  it?   Usually  I pull the TTT or better yet the CCT diagrams but basically after you get up into 1550 to 1650F for your castings then you need to really slow cool or furnace cool and if you thermocouple a heat sink max thickness of casting slow cool ma 40F per hour max.   That's a start and see where you are at then dial it in from there.   This is 2 part problem 1)hold time at heat and 2) cooling rate very slow.  You may have to go a little slower as the CA40 is so hardenable.  Also because of casting segregation make sure you are at heat say 1625F and hold it say 1 to 2 hours to start for economics and then add time if you need but usually if you are at heat for that time you should  be good.   I used load thermocouples for aerospace work but as soon as you find the temperature and time to process you can work off furnace.  

Good luck

Wayne Terwilliger 

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Wayne Terwilliger
Metallurgical Engineer
Shelby Township MI
(248) 410-7715
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