hardness+values

=hardness values=


 * Tensile strength of tempered stee l || Brinell || Vickers || Rockwell ||
 * 60MPa || 172 || 176 || 87 (B) ||
 * 100MPa || 300 || 317 || 108(B) ||
 * 200MPa || 547 || 606 || 54(C) ||
 * 299MPa || 679 || 893 || 66(C) ||

activity =quiz - hardness values=

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