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Posted: 10/24/2012 3:56:29 AM EDT
| Were the older Bushmaster barrels (late 90s-early 00s) made from 4140 or 4150 CMV steel? |
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Y'all even look at 11595? Reads "The Mil Spec is 4150 with additional Vanadium and Molybdenum." Oh no you didn't read it.
There is 4150 and there is CMV. No such thing as cmv grade 4150 or 4150 cmv. Both are milspec. 4150 is harder/tougher due to added carbon. CMV Is harder/tougher due to added vanadium. CMV is closer to 4140, then 4150 other then the vanadium (it has maybe 1-4%more carbon vs true 4140) No such thing as "4150 CMV" at least how ever 11595 is concerned. Is it possible some manufacturer is using 41v50? Sure but not by the books Click for 11595e |
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Yes, I did read it, y'all! Vanadium is added to create a fine grain structure during heat treatment and Molybdenum for additional wear resistance. We have had this discussion on ARFcom for years. The last one is MIL-B-11595E(AR) TABLE I. Chemical composition.1,2,3 TABLE I. Chemical composition.1,2,3 TABLE I. Chemical composition.1,2,3 |
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Quoted:
Quoted:
Thanks, folks. You're welcome. While there is a difference, the difference is slight. Not a Shrub fanboi, but they do sell a good barrel. The reason I was asking is that I have three from the time period in my original post. I have "upgraded" them with FA BCGs and better/smoother single-stage triggers. I wasn't sure about the barrels though. I wasn't trying to start a shitstorm here! 
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Quoted: Quoted: Quoted: Thanks, folks. You're welcome. While there is a difference, the difference is slight. Not a Shrub fanboi, but they do sell a good barrel. The reason I was asking is that I have three from the time period in my original post. I have "upgraded" them with FA BCGs and better/smoother single-stage triggers. I wasn't sure about the barrels though. I wasn't trying to start a shitstorm here! No worries. The crapstorms happen all by themselves on ARFCom. As long and the throat and crown are GTG, shoot them!! You can see from my posting that the difference between 4150 and Mil Spec is slight. |
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Quoted:
Yes, I did read it, y'all! Vanadium is added to create a fine grain structure during heat treatment and Molybdenum for additional wear resistance. We have had this discussion on ARFcom for years. The last one is MIL-B-11595E(AR) TABLE I. Chemical composition.1,2,3ORD 4150Element Composition PercentCarbon 0.48 - 0.55Manganese 0.75 - 1.00Phosphorus 0.040Sulfur 0.040Silicon 0.20 - 0.35Chromium 0.80 - 1.10Molybdenum 0.15 - 0.25VanadiumTABLE I. Chemical composition.1,2,3ORD 4150ResulfurizedElement Composition PercentCarbon 0.47 - 0.55Manganese 0.70 - 1.00Phosphorus 0.040Sulfur 0.05 - 0.09Silicon 0.20 - 0.35Chromium 0.80 - 1.15Molybdenum 0.15 - 0.25Vanadium TABLE I. Chemical composition.1,2,3Chrome-Moly-VanadiumElement Composition PercentCarbon 0.41 - 0.49Manganese 0.60 - 0.90Phosphorus 0.040Sulfur 0.040Silicon 0.20 - 0.35Chromium 0.80 - 1.15Molybdenum 0.30 - 0.40Vanadium 0.20 - 0.30 Aaaand you proved my point. 4150 and CMV are totally different alloys. Thanks. I'm guessing you still don't understand it. |
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Quoted: Quoted: Yes, I did read it, y'all! Vanadium is added to create a fine grain structure during heat treatment and Molybdenum for additional wear resistance. We have had this discussion on ARFcom for years. The last one is MIL-B-11595E(AR) TABLE I. Chemical composition.1,2,3ORD 4150Element Composition PercentCarbon 0.48 - 0.55Manganese 0.75 - 1.00Phosphorus 0.040Sulfur 0.040Silicon 0.20 - 0.35Chromium 0.80 - 1.10Molybdenum 0.15 - 0.25VanadiumTABLE I. Chemical composition.1,2,3ORD 4150ResulfurizedElement Composition PercentCarbon 0.47 - 0.55Manganese 0.70 - 1.00Phosphorus 0.040Sulfur 0.05 - 0.09Silicon 0.20 - 0.35Chromium 0.80 - 1.15Molybdenum 0.15 - 0.25Vanadium TABLE I. Chemical composition.1,2,3Chrome-Moly-VanadiumElement Composition PercentCarbon 0.41 - 0.49Manganese 0.60 - 0.90Phosphorus 0.040Sulfur 0.040Silicon 0.20 - 0.35Chromium 0.80 - 1.15Molybdenum 0.30 - 0.40Vanadium 0.20 - 0.30 Aaaand you proved my point. 4150 and CMV are totally different alloys. Thanks. I'm guessing you still don't understand it. Yes, I do understand. You are being an ass for no good reason. |
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