Hi Joseph,
I don't know your exact situation so I'm just going to toss out some comments that may be helpful.
In many alloy systems the cast materials do not exactly match the wrought ones. The cleanliness of the microstructure, the castability of the particular grade, and so on are some of the reasons. I did find an ASTM specification,
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A915/A915M
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Steel Castings, Carbon and Alloy, Chemical Requirements Similar to Standard Wrought Grades
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And an old version at least of this spec does show a 4130, but not a 41B30.
The reason for the SAE/AISI/UNS specs for steels is strictly for chemistry, which in common manufacturing practice will give the customer a certain range of heat treatment response. If you're planning to make a part, you have to figure out which properties you want and then tailor your alloy and heat treatment to generate those properties. It's uncommon for a cast part to have exactly the same shape and thicknesses as a part that has been produced by forging or by machining and welding, just because of the characteristics of these processes. When a part's shape and thickness is changed, the heat treat response is changed, and a grade that produced the desired characteristics in one process may not have those same properties when produced differently.
So calling out a composition, but not guaranteeing an identical production process, may not get you the same part. Even a cast 41B30, if you can find it, will probably have a different grain size and therefore different heat treat response even when treated identically to a forged or a machined from stock part. If you're looking for a tight range of properties in fact, the H-type steels (4130H) have tighter ranges of min-max hardnesses at a given thickness. Though again the grain size is a factor that will be different in a casting, and I don't know if the H grades are produced as castings.
So I am saying that you should produce a casting of a known grade, in the size and shape meeting your requirements, then check its properties (hardness, required toughness, or whatever) and adjust the alloy grade and heat treatment until you get the properties you need, rather than calling out a grade in advance. Your casting supplier may have the expertise to take a range of thicknesses, and a proposed heat treat schedule, and advise you as to which grades will provide good results.
And make sure your casting spec calls out when and where welding is allowed for repair and how it is handled and inspected.
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Paul Tibbals
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Original Message:
Sent: 03-22-2021 11:36
From: Joseph Brown
Subject: 41B30 steel for cast part
Hello ASM community,
I am in need of advice on casting parts from 41B30 steel. I have not found relevant results when searching for cast 41B30, and what I have read about boron's reactivity with oxygen and nitrogen during steel making leads me to conclude that boron steels are not commonly used to produce cast parts and that it may not be a practical possibility. Is there a cost-effective process to cast parts with boron treated steels such as 41B30?
Thank you,
Joseph Brown
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Joseph Brown
Hubbell Power Systems
Centralia MO
573-682-8378
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