×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Nitralloy

Nitralloy

Nitralloy

(OP)
Preheat for nitralloy 135.  Any reference to what it should be?  Some say 60F some say 600F any actual code would be helpful.

RE: Nitralloy

To determine preheat requirements for welding, you should calculate the CE (carbon equivalent) for this alloy steel -

Nitralloy 135 is a Cr-Mo alloy steel with moderate hardenability and contains a carbon content of 0.4%, so extreme care must be exercised to avoid hydrogen cracking in the weld heat affected zone. Low hydrogen electrodes are required.

Your preheat requirement for this alloy will be close to 600 deg F using the IIW formula

FAQ330-1077

RE: Nitralloy

Will you be heat treating after welding? ( I hope so)  If so, then do it quickly.  Today or tomorrow, not next week.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm

RE: Nitralloy

(OP)
Its for a welder qualification.  Where can I find the PWHT requirements?  UCS-56?  Is there not a P# for A355 Grade A?

RE: Nitralloy

(OP)
Sorry it's for a stellite overlay, I should have included that.

RE: Nitralloy

There is no P-No for this material. The ASTM A 355 is a Standard specification for Steel Bars, Alloys for Nitriding.

What exactly are you doing? You have a low alloy, moderate hardenability steel that can be surface hardened by induction or nitriding, and you want Stellite deposited on the surface??? If you need Stellite hardfacing, I would select a more suitable alloy that has better weldability.

RE: Nitralloy

(OP)
Its for a Hardfacing welder qualification.  Filler that will be used MIL-RCoCr-A1.  And what a bout PWHT?  With no P-no what do I use for a PWHT?  

RE: Nitralloy

3lilaggies;
You missed my point above, and did not answer my questions. I would not suggest using Nitralloy with Stellite hardfacing. Instead for the welder qualification, use 3/8" thick, P-No 1 steel as a base metal for the Stellite hardfacing.

RE: Nitralloy

(OP)
Can I qualify the welder to weld a stellite overlay on nitralloy, on P-N0 1 steel?  I don't know.  This is my first time dealing with this type of thing.

RE: Nitralloy

You need a Welding Procedure Specification (WPS) for the welder to follow during the welder qualification testing.  

What does the welding procedure say about PWHT?  
Do you have a qualified procedure now?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources