Material Comparison

[AirRider04]

Good Day

We currently use 1026 ASTM A513-00 Type 5, 6.25" OD x 3/8" wall DOM Round Tube, Normalized with following specs.

Yield = 48,330 ksi
Ultimate = 71,070 ksi
% Elong in 2" = 33.9
HRB = 75-76

Our supplier is out of stock on this material & wants to substitute material with the following specs.

Material was normalized, but then was heat treated again (unkown process)
Yield = 78,000 ksi
Ultimate = 92,000 ksi
% Elong in 2" = 25
HRB = 92

For our process I'm concerned about the impact of the elevated hardness.

Any Thoughts! Thanks

Neil

 

[Carburize]

What is the application?

 

[Goahead]

Hi Neil,
If only the impact properties bother you, what about testing both materials and comparing?
Is there a minimum temperature during usage?
Fatigue is not an issue?
I would be concerned by the unknown reheat treatment: was it uniform? no overheat? I think it maybe risky.
Is it feasible and economic to perform a third treatment under a controlled process?
Good luck.

http://www.welding-advisers.com/

 

[AirRider04]

Application
A rubber bushing gets press-fit into the tube (Tube is 6.5" length). The bushing sees a lot of twisting forces.

With this material, we're concerned with the material being to brittle & cracking.

Should have have said "influence" instead of "impact" - not worried about impact qualities.

 

[EdStainless]

It is still a fairly ductile material.
What is the highest strength/lowest elongation that you have ever used?
How do the existing tubes fail? Do they break or bend?
Your own history may tell you what you need to know.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[TVP]

This steel will not be brittle or susceptible to brittle fracture. Whether or not it can meet the application requirements is still not clear. EdStainless asked some very good, pertinent questions. I would lean toward saying the higher strength won't be a problem, but there are still a lot of unknowns.