结果表明钢板中心裂纹为白点缺陷，钢中氢含量高是造成钢板探伤不合的主要原因。
The results show that central crack in the defect plate is flake and high hydrogen content induces the ultrasonic test defects.
添加材料的水分和增强熔池中的搅拌程度对钢中氢含量影响很大，但钢中锰含量的增加对氢含量的影响不大。
The moisture content of the raw materials added into ladle and stir intensity have a great effect on hydrogen content in the molten steel.
通过对45钢两种试样状态及冶炼、轧制工艺的分析，找出了白点是导致45钢断面收缩率不合的根本原因，钢中氢含量高是内因，轧后冷速过快是外因。
By analyzing the states of two samples and smelting and rolling process, it was found out that the essential reason resulting in area reduction disqualification of Steel 45 was flake.
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