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Engineers/Fabricators/Steel Guys....A Question

Horse Plains Drifter
Can A514(T1) 1/4" plate be bent 90? in a press brake, on a 1/2", or 3/4" or 1" (if necessary) radius without cracking/work hardening the bend? TIA for any input.
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5 comments

Date Votes
  • babun
    1/2" min.


    Recommended Fabricating Practices for Cold Forming
    (Bend axis perpendicular to rolling direction ?across the grain?)*
    Suggested inside Radii for 90deg bends for thicknesses expressed in terms of ?t? where t = mat. thickness
    Steel
    A36 ? 36,000 psi Minimum Yield Strength
    Thru .250? 1t
    .250 to .500? 1 ?t
    .500 to 1.00? 2t

    Grade 50 ? 50,000 psi Minimum Yield Strength - ASTM A570, A572, A607, and A935
    Thru .187? 1 ?t
    .187 thru .229? 2t
    .187 thru .500? 2 ?t


    Grade 50 - Improved Formability? 50,000 psi Minimum Yield Strength (ASTM - A656 T3, A715, and A936)
    Thru .500? 1t
    Grade 80 ? 80,000 psi Minimum Yield Strength (ASTM A656)
    Thru .250? 2 ?t
    Over .250? 3t

    AR200 - 70,000 psi Typical Yield Strength (No ASTM exists)
    Thru .187? 1 ?t
    .187 thru .229? 2t
    .187 thru .500? 2 ?t


    T1 ? 100,000 psi Minimum Yield Strength (ASTM A514 Gr B)
    Thru .250? 2t
    .250 to .500? 2 ?t
    .500 to 1.00? 3t


    AR400 ? 155,000 psi Typical Yield Strength (No ASTM exists)
    Thru .787? 3t (use 13.5t bottom die opening)
    Over .787? 4t (use 18t bottom die opening)


    Aluminum
    3003 - H14
    Thru .062? ? t
    Over .062?to .188? 1t
    Over .188? to .250? 1 ? t
    Over .250 to .500? 2t
    5052 ? H32
    Thru .062? 1t
    Over .062?thru .375? 1 ? t
    Over .375? to .500? 2t
    6061 ? T6
    Thru .031? 1t
    Over .031? thru .062? 1 ? t
    Over .062? thru .125? 2 ? t
    Over .125? thru .250? 4 t
    * Larger minimum radii
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  • Mr. Perfect
    Yeah... what babun posted is the general guidelines I use.

    You can do smaller radii bends but you'd have to do it at elevated temps to ensure proper material flow without cracking. I don't have a lot of experience with it, I just know that it can be done. Typically if you want much sharper folks will just weld and grind for all the trouble it's worth.
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  • Horse Plains Drifter
    Thanks guys! Yeah, the guy I'm doing some work for is making 45" long channel shaped pieces that are 7- 1/2" tall X 5- 3/4" wide when finished. He will be making multiple pieces. Right now we are cutting/welding them out of three pieces. By having them broke would save making four 38" welds. They have a stepped notch in one end that ends up at 7" X 3-1/2" that we will still have to cut and plate, but saving 152" of weld on each piece will save considerable shop time/cost.
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  • chris8X57
    Your first 90 bend won't be hard to do, but you may have clearance issues with the top die when you bend your 2nd 90.

    Your bottom should die be a 2" wide V since you need 8 times the thickness of your material.
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  • babun
    How exact do your sizes have to be?? Before I'll do that much welding,
    I'll look into a preformed channel available.

    See this...
    http://www.allmetalssupply.com/wp-content/uploads/2014/07/CHANNEL-SIZE-AND-WEIGHT-CHART.pdf
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