Study on the properties of titanium bearing weather-proof building steel
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摘要: 研究了耐候建筑钢Q235NH中添加不同含量Ti后试样的显微组织、耐腐蚀性能和耐磨损性能。结果表明：随钛含量逐渐增加，试样的腐蚀电位先正移后负移、磨损体积表现为先减后增，试样的耐腐蚀性能和耐磨损性能均先提高后下降。随Ti含量从0增至0.09%，试样组织逐渐细化；当Ti含量从0.09%增至0.15%，试样组织未发生明显细化，但内部氮化物颗粒显著粗化。与未添加Ti相比，试样的腐蚀电位正移78 mV、磨损体积减小7.2×10−3 mm3。基于改善耐腐蚀性能和耐磨损性能出发，Q235NH耐候建筑钢中合金元素Ti的含量优选为0.09%。Abstract: In this paper, the corrosion resistance and wear resistance of Q235NH building steel specimens with different Ti content were studied. The results show that with the increase of titanium content, the corrosion potential of the sample first moves forward and then moves negative, and the wear volume first decreases and then increases. Both of the corrosion resistance and wear resistance of the sample present a increase followed by decrease. With the Ti content increasing from 0 to 0.09%, the microstructure of the sample is gradually refined. When Ti content increases from 0.09% to 0.15%, the microstructure of the sample is not refined, but the internal nitride particles are coarsened. The corrosion potential of the sample positively shifts by 78 mV and the wear volume decreases by 7.2 × 10−3 mm3, compared with that without Ti. Based on the improvement of corrosion resistance and wear resistance, the optimum content of Ti in Q235NH weather-proof building steel is at 0.09%.
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Key words:
- weather-proof building steel /
- Q235NH /
- titanium content /
- corrosion resistance /
- wear resistance
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图 1 含钛耐候建筑钢表面腐蚀形貌
Ti含量: (a) 0; (b) 0.03%; (c) 0.06%; (d) 0.09%; (e) 0.12%; (f) 0.15%
Figure 1. Morphology of titanium bearing weather-proof building steels after corrosion
图 2 含钛耐候建筑钢表面磨损形貌
Ti含量: (a) 0; (b) 0.03%; (c) 0.06%; (d) 0.09%; (e) 0.12%; (f) 0.15%
Figure 2. Morphology of titanium bearing weather-proof building steels after wear
图 3 试样显微组织金相照片
Ti含量: (a) 0; (b) 0.03%; (c) 0.06%; (d) 0.09%; (e) 0.12%; (f) 0.15%
Figure 3. Metallography of specimens’ microstructure
图 4 试样碳氮化物的金相照片
Ti含量: (a) 0; (b) 0.03%; (c) 0.06%; (d) 0.09%; (e) 0.12%; (f) 0.15%
Figure 4. Metallography of specimens’ nitrides
表 1 试样化学成分
Table 1. Chemical compositions of the alloy specimens
% 编号 C Si Mn Cr Cu Ti S P Fe 试样1 0.12±0.02 0.25±0.05 0.45±0.05 0.60±0.05 0.30±0.05 0 ＜0.035 ＜0.035 Bal. 试样2 0.12±0.02 0.25±0.05 0.45±0.05 0.60±0.05 0.30±0.05 0.03 ＜0.035 ＜0.035 Bal. 试样3 0.12±0.02 0.25±0.05 0.45±0.05 0.60±0.05 0.30±0.05 0.06 ＜0.035 ＜0.035 Bal. 试样4 0.12±0.02 0.25±0.05 0.45±0.05 0.60±0.05 0.30±0.05 0.09 ＜0.035 ＜0.035 Bal. 试样5 0.12±0.02 0.25±0.05 0.45±0.05 0.60±0.05 0.30±0.05 0.12 ＜0.035 ＜0.035 Bal. 试样6 0.12±0.02 0.25±0.05 0.45±0.05 0.60±0.05 0.30±0.05 0.15 ＜0.035 ＜0.035 Bal. 
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表 2 不同钛含量试样的实测腐蚀电位
Table 2. Corrosion potential of samples with different titanium contents
编号 腐蚀电位/V 平行试样1 平行试样1 平行试样1 平均值 试样1 −0.734 −0.729 −0.736 −0.733 试样2 −0.711 −0.714 −0.708 −0.711 试样3 −0.684 −0.699 −0.687 −0.690 试样4 −0.657 −0.653 −0.656 −0.655 试样5 −0.671 −0.668 −0.665 −0.668 试样6 −0.689 −0.692 −0.686 −0.689
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表 3 试样磨损体积测试结果
Table 3. Wear volume test results of samples
编号 腐蚀体积×103/mm3 平行试样1 平行试样1 平行试样1 平均值 试样1 18.4 19.6 18.7 18.9 试样2 16.1 15.4 15.7 15.7 试样3 13.5 13.9 14.1 13.8 试样4 11.5 11.8 11.9 11.7 试样5 12.2 12.8 12.4 12.5 试样6 13.8 14.3 13.7 13.9
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