Page 87 - MDI Steel Reference Guide

Recommended Fabricating Practices for Cold Forming (Bend axis transverse (perpendicular) to rolling direction “across the grain”)* Suggested inside Radii for various thicknesses expressed in terms of “t” where t = material thickness.
STEEL
A36 - 36,000 psi Minimum Yield Strength Thru .250” 1t
.250 to .500” 1-1/2t
.500 to 1.00” 2t
Grade 50 - 50,000 psi Minimum Yield Strength (ASTM - A1011 Gr 50, A572, A1011 HSLAS Gr 50, A1018 Gr 50)
Thru .187” .187 to .229” .229 to .500”
1-1/2t 2t 2-1/2t
Grade 50 - Improved Formability - 50,000 psi minimum Yield Strength (ASTM - A656 T3,
A 1011 HSLA-F Grade 50 Class 2)
Thru .500” 1t
Grade 80 - 80,000 psi Minimum Yield Strength (ASTM - A656)
Thru .250” 2-1/2t
Over .250” 3t
AR200 - 70,000 psi Typical Yield Strength (No ASTM exists)
Thru .187” .187 to .229” .229 to .500”
1-1/2t 2t 2-1/2t
T1- 100,000 psi Minimum Yield Strength (ASTM - A514 Gr B)
2t perpendicular to the grain of the material 3t parallel to the grain of the material
AR200 - 155,000 psi Typical Yield Strength (No ASTM exists)
Thru .787” 3t (use 13.5t bottom die opening) Over .787” 4t
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