提高 Cr-Mo-V 系炮钢韧性的有效途径

为提高Ｃｒ－Ｍｏ－Ｖ系炮钢的韧性，消除其冷脆性，对采用含稀土氧化物渣系在电渣重熔过程加入稀土的工艺作了系统的实验研究。结果表明，研究采用能适应稀土渣系特点的新的工艺规范，能充分发挥稀土在钢中的作用，显著提高钢的韧性。与采用传统渣系相比，使Ｃｒ－Ｍｏ－Ｖ系炮钢锻件横向常、低（－４０℃）温韧性分别提高５０％和６０％以上，韧脆转变温度降低２０℃，达到－４０℃，彻底消除了这类钢使用温度范围的冷脆倾向。对稀土氧化物在电渣重熔中的作用做了分析探讨。

EFFECTIVE TECHNOLOGY FOR IMPROVING TOUGHNESS OF GUN STEELS OF Cr-Mo-V SYSTEM

The technology of electro-slag remelting was researched systematically under the condition of using the slag system containing rare earth oxide in order to eliminate the cold brittlement of gun steels of Cr-Mo-V system. The results show that, when the new technology suitable for rare earth slag system was achieved from the researching and applied to the electric slag remelting process, the impact toughness of Cr-Mo-V steel increased remarkably than that of the same steel remelted from the usually used slag system. For example, the Charpy impact toughness of room temperature and low temperature (-40℃) increased by 50 percent and 62.5 percent respectively, at the same time, the ductile brittle transition temperature lowered 20℃ and reached 42 degress of frost, and therefore, the low temperature brittlement of this sort of steel in the range of applied low temperature elimina ted thoroughly. The behaviour of rare earth oxide in remelting and effects of rare earth metals in steels were discussed. DEYWORDS gun steel, Cr-Mo-V system, impact toughness, cold brittlement, slag system containing RE oxide, electro-slag remelting technology