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 MSA  Vol.10 No.11 , November 2019
The Inspection of Spheroidized Annealing on SCM435 Cold-Forging Quality Steel Wires with Protective Atmosphere
Abstract: A cold-forging quality steel rod is usually applied for manufacturing wire which is generally produced by drawing wire coil into wire, followed by spheroidized annealing treatment to achieve the necessary formability for cold forging. The subcritical and intercritical processes are usually used to spheroidize the steel wires. The cold-forging quality SCM435 alloy medium carbon steel wires are widely used to manufacture high tension bolts for mechanical and heavy industry. In this study, the spheroidized annealing experiments on SCM435 alloy steel wires are conducted in a commercial bell furnace with a protective atmosphere of nitrogen or hydrogen. The mechanical properties of annealed steel wires are measured by tensile and Rockwell hardness tests and the process capability is evaluated. It is experimentally revealed that, for SCM435 alloy medium carbon steel wires, the wire quality with intercritical annealing is much better than that with subcritical annealing and is markedly affected by furnace atmospheres. The intercritical annealing quality on SCM435 alloy steel wire in hydrogen atmosphere furnace is better than in nitrogen atmosphere furnace. A comparison between the results obtained using the intercritical annealing with hydrogen atmosphere and the measures using the subcritical annealing shows that the intercritical annealing effectively improves the performance measures of low strength and high ductility over their values at the subcritical annealing. The results presented in this study could be a reference for fasters wire manufacturers.
Cite this paper: Yang, C. and Lu, N. (2019) The Inspection of Spheroidized Annealing on SCM435 Cold-Forging Quality Steel Wires with Protective Atmosphere. Materials Sciences and Applications, 10, 677-686. doi: 10.4236/msa.2019.1011048.
References

[1]   Hill, R. (1984) Annealing: The First Step in Cold Forming. Wire Journal International, 17, 95-97.

[2]   Dhers, J., Thivard, B. and Genta, A. (1992) Improvement of Steel Wire for Cold Heading. Wire Journal International, 25, 73-76.

[3]   Bramfitt, B.L. and Hingwe, A.K. (1991) Annealing of Steel. In: Heat Treating, ASM International, Materials Park, 42-55.

[4]   Johnson, P. (1991) Furnace Atmospheres. In: Heat Treating, ASM International, Materials Park, 542-567.

[5]   Messina, C.J. (2011) Raw Material Processing: Advances in Spheroidize Annealing of Wire Rod Using 100% Hydrogen. Fastener Technology International, February, 26-27.

[6]   O’Brien, J.M. and Hosford, W.F. (2002) Spheroidization Cycles for Medium Carbon Steels. Metallurgical and Materials Transactions A, 33, 1255-1261.
https://doi.org/10.1007/s11661-002-0226-y

[7]   Ko, Y.G., Namgung, S., Shin, D.H., Son, I.H., Rhee, K.H. and Lee, D.-L. (2010) Spheroidization of Medium Carbon Steel Fabricated by Continuous Shear Drawing. Journal of Materials Science, 45, 4866-4870.
https://doi.org/10.1007/s10853-010-4587-0

[8]   Joo, H.S., Hwang, S.K., Baek, H.M., Im, Y.-T., Son, I.-H. and Bae, C.M. (2015) The Effect of a Non-Circular Drawing Sequence on Spheroidization of Medium Carbon Steel Wires. Journal of Materials Processing Technology, 216, 348-356.
https://doi.org/10.1016/j.jmatprotec.2014.10.001

[9]   Gul, Y.P., Sobolenko, M.A. and Ivchenko, A.V. (2012) Improvement in the Spheroidizing Annealing of Low-Carbon Steel for Cold Upsetting. Steel in Translation, 42, 531-535.
https://doi.org/10.3103/S0967091212060058

[10]   Ji, C., Wang, L. and Zhu, M.-Y. (2015) Effect of Subcritical Annealing Temperature on Microstructure and Mechanical Properties of SCM435 Steel. Journal of Iron and Steel Research, International, 22, 1031-1036.
https://doi.org/10.1016/S1006-706X(15)30108-4

[11]   Lv, Z.Q., Wang, B., Wang, Z.H., Sun, S.H. and Fu, W.T. (2013) Effect of Cyclic Heat Treatments on Spheroidizing Behavior of Cementite in High Carbon Steel. Materials Science and Engineering: A, 574, 143-148.
https://doi.org/10.1016/j.msea.2013.02.059

[12]   Yang, C.-C. and Liu, C.-L. (2016) Improvement of the Mechanical Properties of 1022 Carbon Steel Coil by Using the Taguchi Method to Optimize Spheroidized Annealing Conditions. Materials, 9, 693.
https://doi.org/10.3390/ma9080693

[13]   Yang, C.-C. and Wang, S.-T. (2018) Improvement of the Mechanical Properties of Spheroidized 10B21 Steel Coil Using Taguchi Method of Robust Design. Sensors and Materials, 30, 503-514.
https://doi.org/10.18494/SAM.2018.1755

[14]   Okonogi, M. and Yamazaki, K. (2017) Development of Medium Carbon Steel Wire Rods for Cold Heading by Isothermal Transformation Treatment. Nippon Steel & Sumitomo Metal Technical Report, 116, 65-70.

[15]   Ostwald, P.F. and Munoz, J. (1997) Manufacturing Processes and Systems. John Wiley & Sons, Inc., New York.

 
 
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