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Steel Tonnage Calculation Guide

Mild carbon steel has a minimum yield strength of 36,000 psi and ultimate strength of 58,000 psi. Grade 1 bolts have these same minimum strength properties. Shear strength is usually 60% of tensile strength, making the shear-yield allowable strength 21,600 psi and shear-ultimate allowable strength 34,800 psi. To calculate press tonnage for stamping, determine the linear inches of cut and multiply by the material thickness and 50,000. For a 2" square washer made of 0.088" thick steel, the calculation is 0.088" x 11.14" x 50,000 = 278.5 tons. Blanking or perforating

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178 views2 pages

Steel Tonnage Calculation Guide

Mild carbon steel has a minimum yield strength of 36,000 psi and ultimate strength of 58,000 psi. Grade 1 bolts have these same minimum strength properties. Shear strength is usually 60% of tensile strength, making the shear-yield allowable strength 21,600 psi and shear-ultimate allowable strength 34,800 psi. To calculate press tonnage for stamping, determine the linear inches of cut and multiply by the material thickness and 50,000. For a 2" square washer made of 0.088" thick steel, the calculation is 0.088" x 11.14" x 50,000 = 278.5 tons. Blanking or perforating

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Mahendra Seth
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Best Answer - Chosen by Voters Most mild carbon steel is equivalent in strength to the properties defined in ASTM A36

for structural steel, which defines the minimum yield strength to be 36,000 psi and the minimum ultimate strength to be 58,000 psi. Grade 1 bolts exhibit these minimum strength properties. Shear strength is usually taken as 60% of the tensile strength. Therefore, the shear-yield allowable strength would be 21,600 psi, and the shearultimate allowable strength would be 34,800 psi.

TONNAGE CALCULATION
Use the guidelines below to calculate the needed tonnage for your stamping project.

General Formula for Press Tonnage Required


Determine the approximate press tonnage needed to stamp a part based on linear inches of cut. For Steel: Material Thickness X Inches of Cut x 50,000 = Press Tonnage Example: Need: 2 Square washer from .088 thick steel Base Material: 2 1/2 coil X 2-1/2 progression

1 O

2 Calculation: 2 + 2 + 2 + 2 = 8 1 circle perimeter ( II D ) 3.14 X 1 = 3.14 Total Inches of Cut = 8 + 3.14 = 11.14 Tonnage Required: .088 Thick X 11.14 X 50,000 (factor CRS .25 carbon) = 278.5 tons

Blanking or Perforating Pressures:

31 Fairfield Place, West Caldwell, NJ 07006 Phone: 9733-575-0610 Fax: 973-575-9234

www.fancort.com

Blanking or Perforating pressure (in tons) equals the total length of cut, or cuts, be it portions or the entire circumference of a circle, the sum of a square, rectangle, or triangle, or the entire total circumference of a number of holes multiplied by the material thickness, multiplied by the shearing strength of material. For answer in tons, the shearing strength must be converted from pounds/square inch (PSI) into tons/square inch by dividing by 2000. Example: Mild steel (shearing strength) = 50,000 PSI/2000 = 25 tons/square inch For drawing, use same method except use tensile strength of material.

31 Fairfield Place, West Caldwell, NJ 07006 Phone: 9733-575-0610 Fax: 973-575-9234

www.fancort.com

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