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Heat Treatable Structural Steel Tubing Needed

Heat Treatable Structural Steel Tubing Needed

Heat Treatable Structural Steel Tubing Needed

(OP)
Hello!

I'm working on a design that depends on the availability of rectangular steel tubing in 3" x 5" and 3" x 10" sizes, both 3/8" wall thickness.  My design calls for a yield strength of about 130 ksi, and is weight sensitive, so throwing more mild steel at it doesn't make sense.  We'd rather heat treat it than use more material.

Are there any structural steel grades, welded or seamless, that have a composition comparable to a 4000 series steel?  For that matter, is there a source for 4000 series (4130, 4140, etc.) steel in this structural shape?

Thanks,

-Rodney Sparks

Rodney Sparks, Consulting Engineer
Creative Spark Engineering - http://www.creativesparkengineering.com
Specializing in conceptual, system-level and detail design of electromechanical products and subsystems.

RE: Heat Treatable Structural Steel Tubing Needed

You may have to settle for A514 tubing in that size (100,000 psi yield).

Contact a domestic structural tube manufacture to be sure.

Ed Danzer
www.danzcoinc.com
www.dehyds.com

RE: Heat Treatable Structural Steel Tubing Needed

Do you have to stay with a rectangular cross section?  Oil Country goods (casing, tubing, and pipe) are commonly produced using 4100-type chemistries.  Obviously, these are only produced in circular cross-sections.  Depending on how much you need, you might be able to get a manufacturer to modify the heat treatment to hit the yeild strength you want.

rp

RE: Heat Treatable Structural Steel Tubing Needed

(OP)
Thanks for the suggestion.  I may have to do that.

However, I want to heat treat the welded assembly, so I don't necessarily need tubing that is already quenched and tempered.  Is there a commonly available steel under a different spec than  A514 that has a similar composition that I could quench and temper after welding in order to arrive at >=100 ksi?

Rodney Sparks, Consulting Engineer
Creative Spark Engineering - http://www.creativesparkengineering.com
Specializing in conceptual, system-level and detail design of electromechanical products and subsystems.

RE: Heat Treatable Structural Steel Tubing Needed

(OP)
redpicker:  Yeah, it's gotta be rectangular.  I've found plenty of round tube for some other parts I've designed.  Thanks for the suggestion though!

-Rodney

Rodney Sparks, Consulting Engineer
Creative Spark Engineering - http://www.creativesparkengineering.com
Specializing in conceptual, system-level and detail design of electromechanical products and subsystems.

RE: Heat Treatable Structural Steel Tubing Needed

It may be possible to have tube custom fabricated from 8620 plate or 4130 and heat treat after welding but it will be expensive.

Ed Danzer
www.danzcoinc.com
www.dehyds.com

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