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三、脫碳的防止 9■T鋼含有硅,能够排挤碳分,使工件表面的碳被盐浴中的氧所夺取,而造成脫碳現象。所以必須經常保持盐浴的純净,以避免工件因脫碳而报廢。新盐所含的氧化物是很微少的,只能使工件表面产生极輕微的脫碳层(約0.01～0.02公厘),而不足以影响产品的質量。但使用日子久了,盐面經常和空气接触而氧化;另外,工件和夹具上的污物、氧化铁落入預热爐中,再轉而带入加热爐,致
Third, decarburization prevention 9 ■ T steel contains silicon, carbon can be squeezed out of the surface of the workpiece by the salt bath of oxygen was captured, resulting in decarbonization. Therefore, we must always maintain the purity of the salt bath to avoid the workpiece scrapped due to decarbonization. The new salt contains very small amount of oxide, only a very slight decarburization layer (about 0.01 to 0.02 mm) on the surface of the workpiece, but not enough to affect the quality of the product. However, the use of the day long, the salt surface is often exposed to air and oxidation; In addition, the workpiece and fixture dirt, iron oxide fell into the preheating furnace, and then into the furnace, resulting