本文结合生产研究了碱性电炉冶炼30航空结构钢材中的发纹问题。大量生产检验结果的统计分析指出:发纹的平均长度与钢材尺寸有密切的关采,钢锭锻轧成材后,钢材直径越小,则出现的发纹也越长;340×340公厘见方的钢锭当加工成60～70公厘直径的钢材时出现发纹的机率最大;同时钢材中发纹分布与钢锭原来部位也有一定的关系。产生发纹的原因是由于链状非金属夹杂物的存在,如铁尖晶石(AL_2O_3·FeO)和铁尖晶石与刚玉的混合物(Al_2O_3·FeO;Al_2O_3)之类。生产试验证明:改善脱氧、采用不同的锻造比以及在锻造过程中进行扒皮可以大大减少以至完全消灭钢中发纹。
Under the works condition, ghost lines in the billets of a low-alloy structural steel, 30 Cr Mn Si,made in basic electric arc furnace were investigated. A statistical analysis of the production datashows that there exists a linear relationship between the average length of ghost lines and the sizeof billets, i. e., after ingots of a given size being forged, the smaller the diameter of billets, thelonger the ghost lines. For ingots of 340×340 millimeter top size, after being forged into billetsof 60 to 70 millimeter diameter, the probability of the occurance of ghost lines appears to be maxi-mum. Meanwhile, it was also observed that the different parts of the ingots have bearing uponthe formation of ghost lines. Ghost lines usually originated from the kind of chain-type non-metallic inclusions, such asspinel of iron and aluminum oxides (Al_2O_3·FeO) and mixture of the spinel and corundum(Al_2O_3·FeO; Al_2O_3). Results of works experiments show that by means of the improvement ofdeoxidation, the adoption of an optimum degree of forgeability and the removal of the surfacelayer of ingots at certain stage during forgoing, ghost lines in billets can be greatly reduced orcompletely removed.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%