炼钢过程中钢液氢含量的变化及分析

为了进一步降低钢中氢含量,保证探伤合格率,利用G8 GALILEO-ON/H分析仪对铸坯进行定氢,结果表明,随着铸坯氢含最的增大,钢板探伤合格率逐渐降低,其氢含量(质量分数,余同)小于(2～3)×10-6时探伤合格率为100%;用贺利式定氢仪测定炼钢过程中氢含量的变化并对其进行了分析,结果表明,转炉复吹和LF精炼是主要...

Analysis on the Hydrogen Content Variation of Molten Steel in Steelmaking Process

In order to reduce the hydrogen content in molten steel and ensure the flaw detection qualification rate, the hydrogen content of casting slab was measured by G8 GALILEO ON/H analyzer. The result show that the flaw detection qualification rate decreases gradually as the hydrogen content increases in slabs, and the flaw detection qualification rate can reach to 100% when hydrogen content is less than (2-3)×10-6. Then, the hydrogen content variation in steelmaking process was tested by HYDRIS hydrogen analyzer, the analysis shows that converter combined blowing and ladle furnace refining are the main hydrogen increasing process, as the increasing content are 173×10-6 and 132×10-6 respectively. The water in adjunct material and rust on the surface of scrap leads to hydrogen content increasing in converter combined blowing process, while the water in refining slag and too fast wire feeding speed leads to hydrogen content increasing in LF refining process. In addition, the casting process is another important reason for hydrogen increasing as the increasing content was 076×10-6, and the inducements for this are the bad long nozzle sealing and insufficient tundish baking.