×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

What effect does Chromium content of 0.5% in Low alloy steel have?

What effect does Chromium content of 0.5% in Low alloy steel have?

What effect does Chromium content of 0.5% in Low alloy steel have?

(OP)
Especially in case of A216, Cr content is restricted max. to 0.5%. Chromium is stable carbide former. Which carbide is formed in case of this Steel, C23C6 or Cr7C3?
What effects does the normalizing and tempering has?

RE: What effect does Chromium content of 0.5% in Low alloy steel have?

Cr has substituted Fe and is acting as ferrite stabilizer only.

It is reducing the austenite region thereby increasing the ferrite region.

Try to obtain Fe-Cr equilibrium diagram and have a look.

Coming back to your questions, no carbides are formed in this case.

As austenite region has reduced, the normalizing range has got squeezed compared to plain carbon steel.

Again, tempering would not have significant difference when compared to plain carbon steel.

DHURJATI SEN


RE: What effect does Chromium content of 0.5% in Low alloy steel have?

This is a low carbon steel casting spec which permits residual Cr up to 0.5%. It will have no real effect on heat treatment specified within the specification or when welded to other parts to various ASME Codes where PWHT is required.

RE: What effect does Chromium content of 0.5% in Low alloy steel have?

0.5% Cr by itself doesn't have much effect on carbon steel, including weld filler metals. Which is why there isn't a standard AISI or PV steel containing only 0.5% Cr - such a steel offers no unique properties that would justify a creating a new grade of low alloy steel.
In the past little while I have been trying to convince a CPWE at a major EPC that this amount of Cr does NOT make steel into a Chrome-Moly grade.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: What effect does Chromium content of 0.5% in Low alloy steel have?

Like others have said the Cr will not have much of an affect on plain WCC or WCB grades in A216. It could cause an issue with exceeding the upper UTS if you are making WCA, depending on the rest of the chemistry. It will raise your carbon equivalent. If S11 or S16 are called out or the part needs to meet NACE requirements this could cause an issue.

The temper does not do much after the normalize. It could help your elongation or reduction of area but I have never seen the need.

RE: What effect does Chromium content of 0.5% in Low alloy steel have?

Fun fact: Chromium in Iron has a negative solution hardening effect at low concentrations.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close