Experimental Study on Nitrogen Micro-alloyed HRB500E Production
The production practice of N-microalloyed HRB500 E was conducted in Xuanhua Steel, and the results show that: 1. the contents of manganese, silicon and vanadium decrease from 1.51％, 0.51％ and 0.102％ to 1.38％, 0.35％ and 0.068％ respectively, due to the use of N-microalloyed technology, the average yield strength (Rel) has been improved from 527.6 MPa to 550 MPa, the average tensile strength (Rel) has been improved from 681.8 MPa to 710 MPa, and the proportion of Y/T ratio (Rm/Rel) no less than 1.25 has been increased from 93.75％ to 100％; 2. the fracture of welded samples is away from welding heat affected zone and the welding performance is very well; 3. the microstructure of the samples is pearlite and ferrite, the proportion of pearlite is more than 47％, and the spacing between the films is small; 4. the second-phase particles in the samples are mainly (V, Ti) (C, N) compounds and they distribute uniformly and finely, and the size is in the range of 10～50 nm.
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万方数据
维普
