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  #1  
Old 17th October 2007, 02:00 PM
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Question AMS Specification QQ-N-290 - What does the class 1, Type IV (QS) mean?

I'm wokring with a AMS QQ-N-290 specification and I was wondering what does the class 1, Type IV (QS) mean?

Thanks,

al40

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Old 17th October 2007, 02:14 PM
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Re: Need information on a specification QQ-N-290

Class I is corrosion protection

Type IV is for "parts containing large amounts of sulfer or selenium"

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Old 17th October 2007, 02:21 PM
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Re: Need information on a specification QQ-N-290

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In Reply to Parent Post by BadgerMan View Post

Class I is corrosion protection

Type IV is for "parts containing large amounts of sulfer or selenium"
Badgerman Thanks,

My next question is why would anyone call out this type of requirement "QQ-N-290 class 1, Type IV (QS)"?

We're working with 1070 steel not sure of the call out and why.

Also if you could point me to the document you pulled this info from it would help too.

Thanks,

al40

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Old 17th October 2007, 02:29 PM
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Re: Need information on a specification QQ-N-290

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In Reply to Parent Post by al40 View Post

Badgerman Thanks,

My next question is why would anyone call out this type of requirement "QQ-N-290 class 1, Type IV (QS)"?

We're working with 1070 steel not sure of the call out and why.

Also if you could point me to the document you pulled this info from it would help too.

Thanks,

al40
It can be had from here; note the cancellation information under "Title."

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Old 17th October 2007, 02:30 PM
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Re: Need information on a specification QQ-N-290

I could not help you with the "why" question. That's a good question for your customer.

I just did a Google search for Class/Type information.

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Old 22nd October 2007, 09:59 AM
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Re: AMS Specification QQ-N-290 - What does the class 1, Type IV (QS) mean?

Well this leads me to a new question what is the difference between the AMS2423 : Plating, Nickel Hard Deposit and AMS2403 : Plating, Nickel, General Purpose ? We're using the nickel plating as a corrosion prevention on 1070 steel that will see some stressing. I don't want to spend a bunch of money on SAE specs that I may not need. Can anyone provide insight?

Thanks,

Al40

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Last edited by al40; 22nd October 2007 at 10:13 AM. Reason: Further clairfication
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Old 29th October 2007, 10:51 AM
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Re: AMS Specification QQ-N-290 - What does the class 1, Type IV (QS) mean?

Quote:
In Reply to Parent Post by al40 View Post

Well this leads me to a new question what is the difference between the AMS2423 : Plating, Nickel Hard Deposit and AMS2403 : Plating, Nickel, General Purpose ? We're using the nickel plating as a corrosion prevention on 1070 steel that will see some stressing. I don't want to spend a bunch of money on SAE specs that I may not need. Can anyone provide insight?

Thanks,

Al40
Update, Found everything I needed in AMS2404 which leads to a quagmire of other specifications.


al40

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