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| C-Mn-Cr-Nb Low-Alloy Steel and Its Hydrogen Induced Cracking-Resistent Performance |
| LI Xiu-cheng,SONG Xin,SHANG Cheng-jia,MIAO Cheng-liang,ZHANG Guo-dong |
| School of Materials Science and Engineering, University of Science and Technology Beiing, Beiing 100083, China |
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Abstract The evolution of mechanical properties and microstructures of a low-alloy steel containing low C, low Mn, high Cr and high Nb were studied after thermo mechanical control process and tempering process after the rolling, respectively.Moreover, resist-hydrogen induced cracking (HIC) tests were carried out on the tested steels. The results show that the mechanical properties of tempered steels are improved comparing with of rolled steel. After tempered at 600℃ for 1h, its yield strength is increased 100MPa, and tensile strength is increased 50MPa, but the toughness almost has no reduction. The type of microstructures after tempering process is similar with of rolling condition, which is still mainly composed of acicular ferrite, and a small amount of quasi-polygonal ferrite. However, M/A constituent gradually reduces with the increasing of tempering temperature. The results of the HIC test indicate that all the tested steels can meet the requirements of standards, and the resist-HIC performance is improved after the tempering treatment.
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Received: 07 August 2012
Published: 18 June 2013
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2013, Vol. 48 
