一般机械工厂可以采用一种簡易可行的办法来鉴定鋼材的好坏。这就是在鋼材上用冷鋸截下一块厚15～18公厘的钢片(如果鋼材太硬,可以先退火后截取;但不能用氧气来切割);在钢片的中心上(30公厘以下的鋼材,可以在侧面)刻一槽子,深度4～5公厘,(如图1)。然后把这块試片在820℃的温 General machinery factory can adopt a simple and feasible way to identify the quality of steel. This is the use of cold saws on steel cut a piece of 15 ~ 18 mm thick steel (if the steel is too hard, you can anneal after the interception; but can not use oxygen to cut); in the center of the steel (30 mm The following steel, you can engrave a groove in the side), the depth of 4 to 5 mm, (Figure 1). Then put the piece of test at 820 ℃ temperature