Hangzhou Making Industry Co., Ltd
Hangzhou Making Industry
Knowledge Center

Specification Guides for Coil Buyers

Short, practical guides on the decisions that actually change what arrives on your decoiler: grade, temper, surface finish, coating weight, slit width and flatness.

A cold rolled steel coil next to a galvanized steel coilMaterial Guide

Cold Rolled or Galvanized Choosing the Right Substrate

Uncoated cold rolled strip is cheaper per tonne, but the comparison only makes sense once the cost of coating the finished part is included. This guide sets out where each one belongs.

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Stainless steel strip undergoing a bend testMaterial Guide

Annealed to Full Hard Stainless Steel Strip Tempers Explained

Two coils of the same stainless grade can behave completely differently in a press. The variable is temper, and it is the field most often left blank on an enquiry.

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Comparison of 2B and BA stainless steel surface finishesMaterial Guide

Stainless Steel Strip Surface Finishes 2B BA and 2H Explained

Finish is specified in the same breath as grade and temper, and getting it wrong is expensive because it is only visible once the part is formed.

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Close view of a galvanized steel surface with a coating thickness gaugeMaterial Guide

Zinc Coating Weight Guide for Hot Dipped Galvanized Strip

Coating weight decides both how long a part survives outdoors and how tightly it can be bent. Those two pull in opposite directions, which is the whole problem.

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Painted and anodized aluminum samples shown side by sideComparison Guide

Painted or Anodized Aluminum Coil Which Finish to Specify

Both arrive finished on the coil. They fail in different ways and they cost differently, so the choice is worth making deliberately.

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Narrow slit steel strip mults being measured with a width gaugeBuying Guide

Narrow Width Slitting What to Check Before You Order

Slitting from 5 mm removes a lot of scrap, but only if the order carries the right information. These are the fields that decide whether the coil runs on arrival.

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Micrometer measuring the thickness of thin gauge steel stripBuying Guide

Thin Gauge Coil Tolerance and Flatness a Buyers Checklist

Below about 0.3 mm, shape stops being cosmetic and starts deciding whether a line runs. Here is what to look at before the coil is on the decoiler.

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About These Guides

Who writes these guides?
We do, from the specification questions customers actually ask us before placing an order. They are written to be useful at the point where a grade is being chosen.
Do the guides cover materials you do not supply?
No. Every guide here is about a material family we carry, so the ranges quoted in them are the ranges you can actually order.

A Question the Guides Do Not Answer

Ask it directly. Specification questions get a straight answer, whether or not there is an order behind them.