scholarly journals Fabrication of Reinforcement Bars in Unalloyed Steel

2019 ◽  
Vol 2019 (2) ◽  
pp. 17-31
Author(s):  
Marek St. Węglowski
Keyword(s):  
Unalloyed Steel

scholarly journals Comparison of resistance to damage of unalloyed carbon steels under the influence of hydrogen

2018 ◽  
Vol 174 ◽  
pp. 01015
Author(s):  
Izabela Pietkun-Greber
Keyword(s):  
Construction Material ◽  
Carbon Steels ◽  
Operating Conditions ◽  
Nacl Solution ◽  
Hydrogen Degradation ◽  
Significant Deterioration ◽  
Hydrogen Saturation ◽  
The Impact ◽  
Corrosive Resistance ◽  
Unalloyed Steel

One of the most commonly used construction material in industry is unalloyed steel S235 and S355. These types of steel are used for construction of ships, bridges, coastal construction, welded tanks, and in buildings. Due to the operating conditions, these types of steel may undergo hydrogen degradation in the process of manufacturing of welded structures or when operating the structures. This paper presents the results of study into resistance of selected types of non-alloy structural steels to hydrogen degradation. Tests were carried out to determine changes in mechanical properties in the static trials of stretching without hydrogen, and after saturation with hydrogen. Parallel fractographic and electrochemical studies were carried out. Hydrogen saturation was carried out at the time from 3. up to 24. hours in a solution of 0.1N H2SO4 with the addition of 2 mg/dm3 arsenic oxide (III) at an electric current density of 20 mA/cm2. The results of the tests have shown that the impact of hydrogen on the tested steels S235JR and S355J2 leads to a significant deterioration in their mechanical and electrochemical properties. At comparable concentrations of hydrogen, steel S235JR is less susceptible to hydrogen degradation and has greater corrosive resistance measured in 3% NaCl solution, in comparison with steel S355J2.

scholarly journals Joining of Metal-Plastics-Hybrid Structures Using Laser Radiation by Considering the Surface Structure of the Metal

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Christian Hopmann ◽  
Suveni Kreimeier ◽  
Jan Keseberg ◽  
Carsten Wenzlau
Keyword(s):  
Automotive Industry ◽  
Adhesive Bond ◽  
Material Structure ◽  
Tensile Shear ◽  
Lightweight Construction ◽  
Shear Tests ◽  
Hybrid Parts ◽  
Microscopy Images ◽  
Unalloyed Steel

Lightweight construction is a central technology in today’s industrial production. One way to achieve the climate goals is the production of hybrid compounds of metal and plastic. The manufacturing process for these hybrid parts can be divided into in-mold assembly and postmold assembly. The postmold assembly includes thermal joining by laser, which is applied in the context of this paper. For the investigations, four plastics (MABS, PA6.6-GF35, PP, and PC), which differ in their properties, and three metals (unalloyed steel, stainless steel, and aluminum) are combined and analyzed. These materials have been used, since they have a huge significance in the automotive industry. Preliminary studies showed that an adhesive bond between the two materials is achieved using metal with a structured surface. According to these studies, three structuring processes for metals (selective laser melting (SLM), NRX, and a welded metallic tissue) are tested. The quality of the material/structure combinations is tested in tensile-shear-tests, microscopy images, and alternating climate tests. Compounds with SLM-Structure achieve highest strength, while compounds with aluminum are much more complex to manufacture.

scholarly journals Bacterial Phosphating of Mild (Unalloyed) Steel

2000 ◽  
Vol 66 (10) ◽  
pp. 4389-4395 ◽  
Author(s):  
Hans-Peter Volkland ◽  
Hauke Harms ◽  
Beat Müller ◽  
Gernot Repphun ◽  
Oskar Wanner ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Iron Oxides ◽  
Driving Force ◽  
Steel Surface ◽  
Surface Reaction ◽  
Bacterial Activity ◽  
Initial Value ◽  
Steel Surfaces ◽  
Steel Electrodes ◽  
Unalloyed Steel

ABSTRACT Mild (unalloyed) steel electrodes were incubated in phosphate-buffered cultures of aerobic, biofilm-formingRhodococcus sp. strain C125 and Pseudomonas putida mt2. A resulting surface reaction leading to the formation of a corrosion-inhibiting vivianite layer was accompanied by a characteristic electrochemical potential (E) curve. First, E increased slightly due to the interaction of phosphate with the iron oxides covering the steel surface. Subsequently, E decreased rapidly and after 1 day reached −510 mV, the potential of free iron, indicating the removal of the iron oxides. At this point, only scattered patches of bacteria covered the surface. A surface reaction, in which iron was released and vivianite precipitated, started. E remained at −510 mV for about 2 days, during which the vivianite layer grew steadily. Thereafter, E increased markedly to the initial value, and the release of iron stopped. Changes in E and formation of vivianite were results of bacterial activity, with oxygen consumption by the biofilm being the driving force. These findings indicate that biofilms may protect steel surfaces and might be used as an alternative method to combat corrosion.

scholarly journals The Use of Arc Welding Processes in the Additive Manufacturing of Metallic Products

2020 ◽  
pp. 43-48
Author(s):  
Krzysztof Pańcikiewicz
Keyword(s):  
Heat Treatment ◽  
Additive Manufacturing ◽  
Maraging Steel ◽  
Arc Welding ◽  
Mag Welding ◽  
Unalloyed Steels ◽  
Manufactured Products ◽  
Welding Processes ◽  
Unalloyed Steel

The article presents examples of additive manufactured products obtained using MIG /MAG welding processes (13). The research-related tests revealed that it is possible to make products of unalloyed steels having the structure similar to castings subjected to heat treatment. Products made of maraging steel require homogenising (heat treatment). It is possible to produce bimetallic products, e.g. unalloyed steel-bronze.

Unalloyed steel, cast steel, and cast iron

2011 ◽  
pp. NA-NA
Author(s):  
Karl Hauffe ◽  
Herbert Puschmann
Keyword(s):  
Cast Iron ◽  
Cast Steel ◽  
Steel Cast ◽  
Unalloyed Steel
Sign in / Sign up

Export Citation Format

Share Document