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Procurement, supplier qualification and logistics · Lesson 2 of 4

Procurement, supplier qualification and logistics: materials, standards and design constraints

What an order for galvanized sheet must say, how passivation and storage stain work, sheet weights from the AFS register, a tested system that names its cleat and cover, metal price movement and lead-time guidance.

You will be able to: Say what an order must state beyond a gauge, how storage stain forms, how heavy a sheet is, how a tested system fixes its parts, and why metal cost and lead time need their own records.

10 min · 9 slides · 8 questions

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Slide 1 of 9

What an order must say

An order for galvanized sheet needs more than "24 ga galvanized". Thickness, finish and coating belong on the same line.

GalvInfo says an order must state whether chemical treatment is or is not required.

Mills call the treatment passivation or chemical treatment, and the two terms mean the same thing.

Sources

Glossary

Passivation
A thin invisible treatment a mill applies on the galvanizing line to reduce storage stain in shipment and storage. Mills also call it chemical treatment. It reduces staining but does not eliminate it.
Storage stain
A corrosion stain, usually white and often called white rust, that forms on galvanized sheet in close contact when it gets wet and cannot dry in free air. It means actual loss of zinc coating.
Price index (1982 = 100)
A series scaled so that its 1982 value is 100. A reading of 200 means twice the 1982 level. It tracks producer prices of a product group and is not what any one buyer pays.