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- Portions of the ship that the material is used on and why, including restrictions to thickness used, if any.*BACK LAYER values of these quantities usually given for face-hardened armors, except for COMPOUND ARMOR, where the numbers are estimates of the surface of the hard steel face layer (the back layer is regular homogeneous WROUGHT IRON ARMOR).
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NOTE: If two numbers are separated by a dash (-), they represent a range of values, with the larger value usually for the thinnest plates of the armor type.
Also, in this HTML document, font restrictions force the elimination of the accent marks used in several non-English words, such as the French "GAVRE" and the German "GRUSON" and "HARTE".
- Name of armor/construction material in common use at the time by the people using it.
If "AVE." is in name, then the material is the average of two or more materials of the same kind made at the same time by more than one manufacturer for the same purpose, but for which separate data either is not known or is not important since the material is used interchangeably and which manufacturer's plate was used in any single case is not known. Test sample's minimum slow stretching force per unit original cross-sectional area needed to tear the sample into two separate parts, in pounds/square inch.
The higher that this is, the stronger the metal is against slowly-increasing, non-impact loads. Test sample's minimum slow stretching force per unit original cross-sectional area needed to make the sample permanently lengthen by 2%, in pounds/square inch. Developed in the early 20th Century in Sweden as a measure of the resistance of a material to local deformation under a near-point stress, here a tiny tungsten (wolfram)-carbide ball under a 3,000 kg (6,614.4 lb) load (other versions of this scale exist, but this covers the largest range for hard materials).
The higher that this is, the stronger the metal is against slowly-increasing, non-impact loads, but only against impact loads if the tensile strength is going up by the same percentage. Percent of the sample's original cross-sectional area by which the narrowest point of the sample had shrunk just as it snapped in two. A formula for the size of the pit formed gives the Brinell Number, with wrought iron being about 100 (actually, 105 is the average) and circa 794 being as hard as the hardest pure cementite (actually, as the hardness goes above 650, the tiny ball begins to flatten out and the values give a greater difference than is actually there, while above 739 the tiny ball flattens out so = badly that it cannot be used).
This is only one of several competing hardness scales, but one of the most widely used, so I use it in place of such possibly more accurate hardness scales (97.5 RB = 20 RC = 238 Vickers = 226 Brinell (minimum RC and Vickers), 251 Vickers = 240 Brinell, and 832 Vickers = 739 Brinell).
Though Brinell testing is not usually used at such high hardness values, a hardness of 66 RC is roughly 757 Brinell, 67 RC is roughly 775, and 68 RC (highest RC used) is roughly 794--these Brinell values would need a test ball harder than tungsten carbide to reach (diamond? A slash (/) means "face maximum/back average" for face-hardened armors.