14. 11. 2017 Metallic materials laboratory Original 1920px The following tests are made here: measuring surface and core hardness, quenching depth, verifying chemical composition. Additional info Original 1920px Original 1920px File type: JPGFile size: 440 KBDimensions: 1920 × 1280 pxPublished: 14. 11. 2017 Tags 2017