论文部分内容阅读
发明的基本情况本发明适用于钢铁在可控气氛中的热处理,特别是退火或球化处理。钢铁种类是接照美国钢铁学会(AISI)的规定表示的,其中包括碳钢、合金钢和合金工具钢。当这些钢种在含有空气、氢气、水蒸汽、二氧化碳,或者其他化合物的炉内气氛中加热进行退火和(或)球化时,钢铁表面将发生化学反应。如果在炉气中含有水蒸汽、氢和二氧化碳,钢铁表面上的碳将因化学反应而损耗。表面脱碳将引起化学成分与晶体结构的
Basic situation of the invention The invention is suitable for the heat treatment of steels in a controlled atmosphere, in particular for annealing or spheroidisation. The type of steel is indicated by the regulations of the American Iron and Steel Institute (AISI), which includes carbon steel, alloy steel and alloy tool steels. When these steels are annealed and / or spheroidized in an in-furnace atmosphere containing air, hydrogen, steam, carbon dioxide, or other compounds, a chemical reaction occurs on the surface of the steel. If the furnace gas contains water vapor, hydrogen and carbon dioxide, the carbon on the steel surface will be depleted by chemical reactions. Surface decarburization will cause chemical composition and crystal structure