Effect of Tempering Temperature on Microstructure and Corrosion Resistance of Plastic Mould Steel S136 SUP

Since the 21st century, the development of automotive and home appliance industries has greatly contributed to the prosperity of the plastics industry, which has led to an increasing demand for molding molds. In the production process, the molds will be impacted, worn and corroded, especially in the production of plastic products made of PVC, fluoroplastics and flame retardant ABS, etc. The molds will be corroded by the corrosive gases generated such as hydrogen chloride, hydrogen fluoride and sulfur dioxide, which requires plastic molds to have a certain degree of corrosion resistance while ensuring strong toughness.S136 SUP is a modified martensitic stainless steel based on S136 from ASSAB, Sweden, which has fine-tuned the content ratio of some elements to ensure a certain strength and high toughness at the same time. The chemical composition, heat treatment and microstructure of the steel have a certain influence on its corrosion resistance, and the tempering temperature of the heat treatment has a greater influence on the corrosion resistance of martensitic stainless steel. Therefore, in this paper, the microstructure and corrosion resistance of S136 SUP at different tempering temperatures are explored and studied.

Effects of Di-2-ethylhexyl phthalate on central nervous system functions: A narrative review

Background: Di-2-Ethylhexyl phthalate (DEHP) is one of the essential phthalate metabolites that disrupt the function of endocrine glands and causes numerous effects on animals, humans, and the environment. Phthalates are widely used in the plastics industry. Low doses of DEHP increase neurotoxicity in the nervous system that has arisen deep concerns due to the widespread nature of DEHP exposure and its high absorption during brain development. Objective: This review article evaluated the impacts of DEHP exposure from birth to adulthood on neurobehavioral damages. Then, the possible mechanisms of DEHP-induced neurobehavioral impairment were discussed. Methodology: Peer-reviewed articles were extracted through Embase, PubMed, and Google Scholar till the year 2021. Results: The results showed that exposure to DEHP during pregnancy and infancy leads to memory loss and irreversible nervous system damage. Conclusion: Overall, it seems that increased levels of oxidative stress and inflammatory mediators possess a pivotal role in DEHP-induced neurobehavioral impairment.

Introduction to Plastics Engineering

Industrial and consumer products made of plastics are ubiquitous in our daily lives. Converting raw plastics into useful parts is a scientific and technological challenge that has been progressively overcome in the past several decades. This expansive monograph authored by one of the leading experts with vast experience as an academic at IIT-Kanpur and a practitioner while at GE Corporate R&D tackles this huge subject by expounding aspects of transforming modern plastics into useful day-to-day items based on principles of mechanical engineering and engineering mechanics. It weaves together complex issues related to the mechanics, mechanical design, fabrication, and assembly of engineered plastics. In doing so, the book distinguishes itself from others by emphasizing not just the material science and ‘build-and-test’ approach embraced by the plastics industry, but by adopting approaches from engineering science and materials science synergistically to address practical issues of part design, size, cost, development cycle, and assembly, among others.