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JWJ > Volume 42(50); 2017 > Article
Journal of Welding and Joining 2017 December;42(50) :42-50.
Published online November 13, 2017.
doi:https://doi.org/10.5781/JWJ.2017.35.6.7
The Effects of Nitrogen Content and Cold rolling reduction on the Mechanical Properties of New 420-series Stainless Steel Strip having a Mesh As-Welded Structure by the Electroslag Cladding
Jae-Young Jung*
*Automobile Parts & Materials Research Center, Kyungpook National University, Daegu, 41566, Korea
Correspondence: Jae-Young Jung  Email: jaeyjung7@gmail.com
Received August 10, 2017  Accepted September 26, 2017  Published online November 13, 2017
ABSTRACT
In this study, we investigated the mechanical properties of new 420 stainless steel strips as a function of nitrogen content and cold rolling reduction. Also, the results of the tensile and thermal fatigue tests using electroslag cladding specimens under a given welding condition were as follows. As-welded structures in which the delta ferrite is present in the form of a mesh are obtained in the alloy composition range in which about 5% delta ferrite is present in the Schaeffler diagram based on Cr equivalent and Ni equivalent. The softening temperature of new 420 stainless steel alloy designed as a mesh as-welded structure was determined to be 680-730℃ as a result of using cold rolled steel at 10-90% reduction. The ratio of 600℃ to room temperature tensile yield strength of weld metal was ~0.37 for the lowest N specimen and ~0.485 for the highest N specimen. However, high temperature ductility deteriorated with increasing N content. The presence of welding beads between the weld metal also reduced the elongation at room and high temperature rather than yield and tensile strength. The thermal fatigue characteristics are almost equal or better than those of the same materials prepared by the submerged welding method.
Keywords: Electroslag cladding | New 420-series stainless steel strip | A mesh as-welded structure | Martensite stainless steel overlay | Cold rolled strip
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