How to determine the proper steel for your part tempers: No. 1 | No. 2 | No. 3 | No. 4 | No. 5 No. 1 temper (hard temper) This full hard temper is intended primarily for flatwork and punching. Annealing after cold rolling makes it very stiff and springy. Roller leveling can be used to remove coil set. Mean tensile: 80,000 psi Rockwell: B90 min. No. 2 temper (half hard temper) This is a stiff steel, used when formed parts must be rigid. Cold rolled after annealing, No. 2 temper, or half-hard strip, will take a right angle bend across the grain (when the radius is greater than the thickness) and a limited amount with the grain. Mean tensile: 64,000 psi Rockwell: B70 - 85 No. 3 temper (quarter hard temper) Number 3 quarter-hard strip has had a moderate amount of cold rolling after annealing, giving it good rigidity and ductility. It will bend at right angles with the grain (when the radius is greater than the thickness) and take a 180 degree bend across the grain. A moderate amount of shallow draw is possible. Mean tensile: 54,000 psi Rockwell: B60 - 75 No. 4 temper (skin rolled temper) This is a very ductile drawing steel and can be bent severely regardless of the rolling direction. A very light skin pass after the final anneal improves the finish and avoids surface stains from showing after the steel has been worked. This material is recommended for tubular moulding or moderately drawn products. Mean tensile: 48,000 psi Rockwell: B65 max. No. 5 temper (dead soft temper) Soft and ductile, Number 5 temper is ideal for difficult drawing and forming operations where surface requirements are not critical. it combines uniformity of chemical composition with mechanical properties and is almost wholly free from fluting. Mean tensile: 44,000 psi Rockwell: B55 max.