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#1
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posted to rec.boats,rec.boats.building
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316, 316l, 316Ti, but like Monel, these alloys are all subject to crevice
corrosion. Their corrosion resistance is due to their ability to absorb oxygen on their surface and if under even mild abrasion or electrolysis and the environment becomes oxygen depleted, they corrode very quickly. So, the answer is to make certain that water flows around the fastener, anti sieze is used on the threads and it isn't mounted near dissimilar metals and your golden. Steve "Brian Whatcott" wrote in message ... Show me the stainless alloy that does not corrode when submerged for long in salt water, and I'm your man. BrianW Steve Lusardi wrote: Brian, Please do the research if you disagree. Stainless fasteners exhibit far greater strength and fatigue resistance, which by the way is poor for the whole nickel alloy family and depending on the alloy, exhibit every bit as good resistance to corrosion. May I also point out that nickel alloys fasteners are not always the best solution for corrosive and electrolytic environments and that includes monel. So, assuming your application qualifies for a nickel alloy solution, why in the world would you choose monel, when SS is better and less expensive? Steve "Brian Whatcott" wrote in message ... Strong AND corrosion-resistant! I'm all ears! Bronze? Particular brasses? Not stainless nor alloy steel nor mild steel certainly. Some aluminum alloys? possibly. nickel alloys (other than monel??) Titanium?? Brian W Steve Lusardi wrote: Ezcellent? I don't think so. There are other materials far better for both strength and corrosion resistance. There are reasons why they are hard to find. Steve |
#2
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posted to rec.boats,rec.boats.building
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One additional point, Monel is a stainless steel alloy. It's primary use is
for high temperature strength and resistance to corrosion, 1000 degrees C and higher. It will retain 90% of its room temperature strength when red hot. Steve "Steve Lusardi" wrote in message ... 316, 316l, 316Ti, but like Monel, these alloys are all subject to crevice corrosion. Their corrosion resistance is due to their ability to absorb oxygen on their surface and if under even mild abrasion or electrolysis and the environment becomes oxygen depleted, they corrode very quickly. So, the answer is to make certain that water flows around the fastener, anti sieze is used on the threads and it isn't mounted near dissimilar metals and your golden. Steve "Brian Whatcott" wrote in message ... Show me the stainless alloy that does not corrode when submerged for long in salt water, and I'm your man. BrianW Steve Lusardi wrote: Brian, Please do the research if you disagree. Stainless fasteners exhibit far greater strength and fatigue resistance, which by the way is poor for the whole nickel alloy family and depending on the alloy, exhibit every bit as good resistance to corrosion. May I also point out that nickel alloys fasteners are not always the best solution for corrosive and electrolytic environments and that includes monel. So, assuming your application qualifies for a nickel alloy solution, why in the world would you choose monel, when SS is better and less expensive? Steve "Brian Whatcott" wrote in message ... Strong AND corrosion-resistant! I'm all ears! Bronze? Particular brasses? Not stainless nor alloy steel nor mild steel certainly. Some aluminum alloys? possibly. nickel alloys (other than monel??) Titanium?? Brian W Steve Lusardi wrote: Ezcellent? I don't think so. There are other materials far better for both strength and corrosion resistance. There are reasons why they are hard to find. Steve |
#3
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posted to rec.boats,rec.boats.building
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Steve Lusardi wrote:
One additional point, Monel is a stainless steel alloy. Really? http://www.espi-metals.com/metals/monel.pdf Alloy 400 has 2.5% iron and Alloy K-500 has 2%. A high copper steel typically has less than 2% copper. Monel is around 30% and it's *NOT* a steel! It's primary use is for high temperature strength and resistance to corrosion, 1000 degrees C and higher. 540 deg C is in the middle of the heat treatment temperature range for Monel K-500. 1000 deg C is around the temperature required to solution anneal this alloy. Its properties are stable below 425 deg C. http://www.hightempmetals.com/techdata/hitempMonelK500data.php It will retain 90% of its room temperature strength when red hot. Steve "Steve Lusardi" wrote in message ... 316, 316l, 316Ti, but like Monel, these alloys are all subject to crevice corrosion. Their corrosion resistance is due to their ability to absorb oxygen on their surface and if under even mild abrasion or electrolysis and the environment becomes oxygen depleted, they corrode very quickly. So, the answer is to make certain that water flows around the fastener, anti sieze is used on the threads and it isn't mounted near dissimilar metals and your golden. Steve "Brian Whatcott" wrote in message ... Show me the stainless alloy that does not corrode when submerged for long in salt water, and I'm your man. BrianW Steve Lusardi wrote: Brian, Please do the research if you disagree. Stainless fasteners exhibit far greater strength and fatigue resistance, which by the way is poor for the whole nickel alloy family and depending on the alloy, exhibit every bit as good resistance to corrosion. May I also point out that nickel alloys fasteners are not always the best solution for corrosive and electrolytic environments and that includes monel. So, assuming your application qualifies for a nickel alloy solution, why in the world would you choose monel, when SS is better and less expensive? Steve "Brian Whatcott" wrote in message ... Strong AND corrosion-resistant! I'm all ears! Bronze? Particular brasses? Not stainless nor alloy steel nor mild steel certainly. Some aluminum alloys? possibly. nickel alloys (other than monel??) Titanium?? Brian W Steve Lusardi wrote: Ezcellent? I don't think so. There are other materials far better for both strength and corrosion resistance. There are reasons why they are hard to find. Steve -- Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED) ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL: |
#4
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posted to rec.boats,rec.boats.building
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Hi Steve,
when you describe monel as a stainless steel, you defeat your position. Brian W Steve Lusardi wrote: One additional point, Monel is a stainless steel alloy. It's primary use is for high temperature strength and resistance to corrosion, 1000 degrees C and higher. It will retain 90% of its room temperature strength when red hot. Steve "Steve Lusardi" wrote in message ... 316, 316l, 316Ti, but like Monel, these alloys are all subject to crevice corrosion. |
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