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白点的特征及其形成条件白点是热轧钢和锻压钢中的缺陷,它大多分布在大型轧钢件和锻件靠近中心处。产生白点的钢,断口呈现出银白色的斑点,且大多数是圆形或椭圆形的,经磨平酸蚀后,则可看出许多微细裂缝。白点主要是由于大型钢件轧制或锻造后,在快冷至100～250℃产生的,而在铸钢件中却很少发现白点。产生白点的因素: (1)冶炼方法:酸性平炉钢不易产生白点,而在碱性平炉钢与电炉钢中则容易出现。 (2)冷却方法:轧制或锻造后,冷却速度愈快,则产生的白点也愈多。
Characteristics of white spots and their formation conditions White spots are defects in hot-rolled steel and forged steel, which are mostly distributed near the center of large-scale rolling and forgings. The white point of the steel, the fracture appears silver-white spots, and most are round or oval, after grinding acid etching, you can see a lot of fine cracks. White spot is mainly due to large-scale steel rolling or forging, the rapid cooling to 100 ~ 250 ℃ produced, but few found in steel castings white spots. Produce the white point of the factors: (1) smelting method: acidic flat hearth steel is not easy to produce white spots, but in the open hearth furnace steel and electric furnace is easy to appear. (2) Cooling method: After rolling or forging, the faster the cooling rate, the more white spots will be generated.