Eddystones are known for having batches of production with sketchy metallurgy, purportedly from the NJ (hint)
plant paying by piece work, motivating workers to heat the billets hotter and faster. Magnaflux can be used to check for cracks. Another method is to apply fast evaporating liquids and look for cracks as they dry.
I agree with this. While we do not have the documentation that we have on the low number 03 Springfields, which were overheated in the forge shop, we do have one post relaying a worker's experience at the time that a similar situation was going on at Eddystone. Workers at Eddystone and Springfield Armory were being paid piece rate and it would be in the worker's economic advantage to stamp parts out faster by heating the billets up. What we do know is that this was a pre Vacuum tube era, and the primarily sensors used in factories were hearing, taste, touch, smell, and vision. Many today have no idea how primitive the pre vacuum tube era was, but, they have an idea of how primitive the 3G era is. Since I am pre 3G, I have no idea what this means, but it must be important. LOL.
Another issue with the metals of the era was the variance in composition. The stuff varied in composition and had a lot of "slag".
For decades shill Gunwriters have been "educating" us with terms such as "Old World Craftsmanship", and "German Technology". These terms are undefined, actually, meaningless advertising terms. For the World War 1 period, German technology was better on the average than anyone else's technology, but the technology of the era was still pre vacuum tube, early 1900's technology.
The following data is taken from
Rifle & Carbine 98: M98 Firearms of the German Army from 1898 to 1918 by Dieter Storz
Inside Dieter’s book , on page 103, are the material specifications for the M98 Mauser. The material looks to be a manganese steel alloy, with copper added for easy machining.
Carbon LT 0.40%
Manganese LT 0.90%
Copper LT 0.18%
Silicon LT 0.30%
Phosphorous LT 0.04%
Sulphur LT 0.06%
On another forum, this information was posted. These are the results of a 1996 "core" assay of a generic WW-I era 1898 Mauser receiver:
Carbon: 0.29%
Sulfur: 0.022%
Phosphorus: 0.019%
Manganese: 0.45%
Silicon: 0.16%
Nickel: 0.05%
Chromium 0.02%
Molybdenum: <0.01% (trace)
Vanadium <0.01% (trace)
Copper 0.17%
Columbium: <0.01% (trace)
The 1996 "core" assay of a WW-I era 1898 Mauser bolt:
Carbon: 0.18%
Sulfur: 0.018%
Phosphorus: 0.014%
Manganese: 0.76%
Silicon: 0.23%
Nickel: 0.29%
Chromium: 0.06%
Molybdenum: <0.01% (trace)
Copper 0.15%
Aluminum: 0.02%
Everything other than carbon, manganese, copper, silicon, phosphorous is crap. Sulphur was undesirable as I understand it. These trace elements found in the steel are contaminants that found their way into the steel, as a result of the primitive production controls and technology of the era. Some of it could have come from scrap drives, which was going on in the US at the time, with everything being thrown into the ladle. I do know that foundries recycled their own scrap, and that always raised the amount of impurities in the mix.
The famous gun smith, Howe, warns in his book that M1917 barrels are not appropriate for conversion to the 300 H&H magnum because of the "stringers" in the metal.
I have looked at the properties of 2340 steel, and the book properties are excellent. It is an excellent nickle steel, only went away because it required 4 1/2 pounds of nickel for every 100 pound billet. Nickel is a relatively rare strategic material. Later alloys dramatically dropped the nickel content. There is no particular reason for receivers made of good 2340 material, properly forged and heat treated, to crack when the original barrel is taken off. Good 2340 is a tough material, not a brittle material. It is my opinion that receiver cracking is positive proof of a receiver being exposed to too much heat somewhere in the factory.
None of this makes any difference to those who hold a romantic vision of the past and worship the objects of the past as religious icons. Woolly headed ideas of a better past ignore the realities of the technology of the time, and the short comings of the period.