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Research and Development on Low Cost Q690D High Strength Steel Used for Construction Machinery
Pages: 17-24
Year: Issue:  5
Journal: Welded Pipe and Tube

Keyword:  Q690D steellath bainitetemperingmechanical properties;
Abstract: In order to develop low cost Q690D steel, based on the C-Mn-Nb-V chemical composition, two kinds of trial steel containing Mo or not were designed. The changes about mechanical properties and microstructures of the trial steel were comparatively studied under different chemical compositions and rolling processes. Test results indicated that, under the same rolling process, with final cooling temperature decrease, the strength of the Mo steel was increased, and the elongation basically remain unchanged. When the final cooling temperatures was in 350~400℃,-20℃impact energy could reach more than 200 J. Under same rolling process and final cooling temperature, cooling rate had little effect on strength of steel without Mo, and the variation of the elongation and impact energy was the same with the steel containing Mo. By reducing start cooling temperature, the strength was lowered at some extent, impact toughness and elongation did not change significantly. Before and after tempering, the mechanical properties of 1# steel containing Mo, final cooling temperature above 450 ℃(process 1) are close to the mechanical properties of 2# steel final cooling temperature at 350~400 ℃(process 5 and process 6). The results showed that under the premise of without adding alloy Mo, properly decreasing the final cooling temperature and quenching+tempering process, the steel plate performance can completely satisfy the requirements of Q690D.
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