TMW

Steelscape provides ZINCALUME® and TruZinc® steel products on both an actual weight and TMW (theoretical minimum weight) basis.

Many of our customers sell their products on a lineal footage basis and it makes sense to purchase the same way.  TMW pricing permits customers to pay for the lineal feet of coated steel in a particular coil (or order).  If the steel is slightly thicker than the minimum dimensions ordered customers do not pay for the excess. Customers are charged only for the lineal feet received.   

There is a small extra charge for the added feature of TMW pricing and customers should contact their Sales Representative for details.

For customers buying and selling steel on an actual weight basis our standard pricing uses the actual weight of each coil (or order) to calculate the invoiced price. Steelscape calculates the price of TMW products as follows:

 

TruZinc® Steel

ρst       = density of steel and zinc coating = 0.2833 lb/in3

χ          = ordered width of steel (inches)

τ          = ordered thickness of steel (inches)

δ          = actual lineal feet of steel (feet)

Theoretical Minimum Weight (lb) = ρst x χ x τ x δ x 12

Gauge x Width x 12 x .2833 = TMW

Example: ordered width = 48”, ordered thickness = 0.019”, actual lineal feet in coil = 5,500

TMW = 0.2833 x 48 x 0.019 x 5500 x 12 = 17,052.4 lb

 

ZINCALUME® Steel

ρst                   = density of steel = 0.2833 lb/in3

ρZINCALUME  = density of zinc-aluminum coating = 0.1355 lb/in3

β                      = thickness of ZINCALUME AZ50 coating = 0.0016”

χ                      = ordered width of steel (inches)

τ                      = ordered thickness of steel (inches)

δ                      = actual lineal feet of steel (feet)

Theoretical Minimum Weight (lbs) = [ρst x (τ - β) + (β x ρZINCALUME)] x χ x δ x 12

Example: ordered width = 48”, ordered thickness = 0.019”, actual lineal feet in coil = 5,500

TMW = [0.2833 x (0.019 - 0.0016) + (0.0016 x 0.1355)] x 48 x 5500 x 12 = 16,293 lb

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