Heat Treatment Process and Optimization of Shooting Nails

Abstract:

Shooting nails are mainly applied to fix thin reinforced concrete and steel plate, so the nails should have high hardness and high toughness. Unreasonable heat treatment process could possibly cause too high hardness and decreased toughness, leading to nail cracking and fracture in the course of production and use. Research on heat treatment process through experimental study on the nail determines the reasonable heat treatment process of nail. The feasible quenching heating temperature was 847~840 °C, and the temperature of salt bath during isothermal cooling was 292 °C. Its resultant hardness was 680HV, meeting the requirements of the use of nails. The shoot nail cracking and fracture in the course of use can be avoided effectively. The microstructure of shooting nails after heat treatment showed lower bainite, which contributed to good mechanical properties.

• Periodical: Advanced Materials Research (Volume 787)
• Pages: 450-453
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.787.450
• Online since: September 2013
• Authors: Li Png Zhang, Suo Qing Yu, Li Yong Ni
• Keywords: Austempering, High Hardness, High Toughness, Low Bainite, Shooting Nails

References

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[2] HAN Dewei, ZHANG Jianxin Bian: Metallographic Sample Preparation and Display Technology (Central South University Press, Changsha 2005).