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Macroetch Test:

Consists of immersing a carefully prepared section of the steel in hot acid and of examining the etching surface to evaluate the soundness and homogeneity of the product being tested.


The structure of metal as revealed by macroscopic examination.


A metal known for its low density, malleability, ductility and the white light it produces when burning.


The property that determines the ease of deforming a metal when the metal is subjected to rolling or hammering.


A brittle, non-malleable metal that is used in alloys to increase hardenability and counteract the brittleness from sulfur.

Mechanical Properties:

Those properties of a material that reveal the elastic and inelastic reaction when force is applied, or that involve the relationship between stress and strain; for example, the modulus of elasticity, tensile strength and fatigue limit.

Medium-Carbon Steel:

Contains from 0.30% to 0.60% carbon and less than 1.00% manganese.


The structure of polished and etched metal and alloy specimens as revealed by the microscope.

Mill Edge:

The edge of strip, sheet or plate in the as-rolled state.

Mill Finish:

A surface finish produced on sheet and plate.


A hard, tough metal that is very ductile and malleable when properly treated at high temperatures, deepens hardening, counteracts temper brittleness, enhances the corrosion resistance in stainless steel, and forms abrasion-resisting particles.