Friction stir processing (FSP) is a surface treatment technology that can eliminate casting defects locally by refining microstructures, thereby improving the mechanical properties of material.

Welding of super bainitic and triplex structure steels was studied using AWS A5.5 E11018-M and AWS A5.4 E312-17 electrodes. The existence of martensitic structure at the heat affected zone encourages the occurrence of cold cracking at the HAZ in welding of both super bainitic and triplex steels. Using E312-17 electrode renders the occurrence of cold cracks at the heat affected zone of these steels. The tensile strength of welded joints using E11018-M electrode is higher than that of the pure weld metal of E11018-M electrode. This could be attributed to the dilution of weld metal from the base metal especially carbon content. The V– notch impact test results using E312-17 electrode were slightly higher than that obtained using E11018-M electrode. This could be attributed to the occurrence of cold cracks using E11018-M electrode in addition to the tough austenitic weld metal using E312-17 electrode.

In the present work, the effect of welding procedure on weldability of conventional high manganese steel compared with the recent developed ladle treated one. This research aims at disclosing the microstructure, hardness, impact toughness and tensile strength of the welded joints. The optical micrograph of the conventional high manganese steel welded joint without cooling between passes shows that the heat affected zone (HAZ) has a high density of carbides formed at the grain boundaries. However, cooling between passes using compressed air resulted in a decrease in the density of carbides formed at the grain boundaries of the HAZ. In the ladle treatment samples, the microstructure shows an increase the density of the eutectic phase of the HAZ as a result of welding without cooling. On the other hand, application of cooling using compressed air between passes results in a low density of the eutectic phase in the HAZ.

Application of cooling between deposited passes resulted in a significant improvement of the impact toughness of weldment in both conventional and ladle treated samples of high manganese steel. The result obtained by SEM observation shows the reduction of both carbides at the grain boundaries in HAZ of conventional high manganese steel and the eutectic phase in HAZ of ladle treated one.

Due to rising raw material prices, the fullest possible recycling of metals is becoming increasingly important. For example, non-ferrous metals are pelleted for reprocessing before they are further processed.

COPT Center offers the stage for Leybold’s video shooting for its newest vacuum product

Cooperation between Universities and industrial enterprises are much more common in other countries, such as Great Britain and the United States. In Germany, cooperation is mostly restricted to the technology level and the subsequent transfer of basic research knowledge gained at the universities to the mass production opportunities of industry.

news in steel

Rolling mill orders from AEMZ and NPZ

Two new High-productivity, High-quality and High-efficiency H3 rolling mills will be installed and put into operation in Russia during 2020.

SMS group to modernize gas cleaning systems at POSCO Gwangyang

SMS group, in cooperation with AERIX Co., Ltd., South Korea, has been commissioned to modernize the gas cleaning systems of the three BOF (Blast Oxygen Furnace) converters at the integrated steel mill of POSCO in Gwangyang, South Korea.

New opportunities for customers in Central and Eastern Europe

SSAB is providing new processing opportunities for customers to explore, with a laser cutting machine and state-of-the-art press brake featuring a patent pending bending technology. The new machines were presented during a unique event at the SSAB steel service center in Oborniki, Poland.

Aceros Arequipa orders steel mill and continuous billet caster

Corporación Aceros Arequipa S.A. (CAASA), based in Arequipa, Peru, has awarded SMS group an order covering the supply of mechatronic equipment for a new steel mill and a billet caster with six strands for its Pisco site.