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World Steel Association releases short-term steel demand forecast for April 2019

Global steel demand continues to grow against a backdrop of slowing economic growth. The World Steel Association released its April 2019 short-term steel demand forecast on April 16, 2019. The forecast predicts that global steel demand will reach 1.735 billion tons in 2019, a year-on-year increase of 1.3%. In 2020, steel demand is expected to grow by 1.0% to 1.752 billion tons. Commenting on the forecast results, Mr. Al Remeiti, Chairman of the World Steel Association's Market Research Committee, said: "Global steel demand is expected to continue to grow in 2019 and 2020, but the growth rate will slow with the global economy..."

2020-12-24 View Details →

Typical surface defects and control of wide plates

Wide and thick plate varieties are widely used in petroleum transportation pipelines, clean energy wind power and other engineering projects. However, with the increasing demand for steel plate thickness, the rolling compression ratio is low, and the surface defects of the steel plate increase. The main types of surface defects are: 1. Edge star cracks of steel plates mainly exist within 80mm of the edge of the steel plate, and expand inward with the increase of the width-to-thickness ratio. Generally, when the width-to-thickness ratio is greater than 1.35, it is in the shape of a mountain peak or chicken claws. This is because the wide and thick plate varieties contain B and alloying elements such as Nb, V, Ti, and Ni. Micro-alloyed steel is sensitive to cracks and is prone to corner cracks, which appear as edge star cracks after rolling and extension. Measures: (

2020-12-16 View Details →

Several points to note about silicon steel smelting, doing well will double the efficiency

Non-oriented electrical steel is a type of soft magnetic material, mainly used in manufacturing motor and transformer cores, etc. The main performance requirements for non-oriented electrical steel include iron loss, magnetic induction intensity, magnetic anisotropy, magnetic aging, brittleness, etc. The smelting process of non-oriented electrical steel is more complex than other steel types, requiring precise process technology in various links such as refining, converter, RH vacuum, and continuous casting. Non-oriented electrical steel is a type of soft magnetic material with a silicon content ranging from 1.0% to 4.5%, mainly used in manufacturing motor and transformer cores, ballasts in fluorescent lamps, magnetic switches and relays, magnetic shielding, and magnets in high-energy accelerators. The following requirements are imposed on the performance of non-oriented electrical steel:

2020-11-27 View Details →

Chinese Academy of Engineering academician Wang Guodong's New Year's message: Innovation drives development, technology leads the future

Building on past successes and forging ahead into the future. The year 2018 was the best year for China's steel industry in the past 10 years, with steady improvements in operational quality and efficiency. The year 2019 marks the 70th anniversary of the founding of the People's Republic of China and is a crucial year for deepening supply-side structural reforms, accelerating the construction of a strong manufacturing nation, and promoting high-quality development. As a key industry supporting China's high-quality development, the steel industry must also deepen supply-side structural reforms, strategically shift towards green, intelligent, and high-quality development, achieve innovation-driven development, and lead the future with technology. Innovation promotes the green development of processes

2020-11-12 View Details →

Research on black spots on the surface of cold-rolled non-oriented silicon steel strip

The black spots on non-oriented silicon steel strip are films 1-2μm thick, mainly composed of oxides, and containing a small amount of organic matter and emulsion. The formation of black spots is due to: during cold rolling, emulsion and iron powder adhere to the surface of the steel strip, and the water in it vaporizes at a rolling temperature above 100℃, thus corroding the surface of the steel strip; during cooling after coiling, the metal atoms on the surface of the steel strip ionize, causing electrochemical corrosion, and finally forming black spots. Based on the reasons for the formation of black spots, effective preventive measures are proposed: changing the emulsion, reducing impurities mixed in the emulsion, improving the purging effect of the steel strip surface, and shortening the steel strip

2020-11-04 View Details →

A set of descriptions about zinc pots

The replacement cycle of galvanized pots. The most important equipment for hot-dip galvanizing is the zinc pot, which is generally made of steel plate. For the galvanizing industry, it is like a human heart. However, after long-term use, the zinc pot will be damaged, so it must be replaced after several years of use. However, there is no clear standard for replacing zinc pots. In the past, when various enterprises replaced zinc pots, they generally took into account the production volume, service life, and loss, and then based on the experience of each factory to carry out, generally blowing plating is replaced once every 2 to 5 years, and the highest record in China is 11 years. The volume calculation formula of the zinc pot is calculated by subtracting 200mm from the depth of the zinc pot.

2020-10-23 View Details →

Rachet behavior and dislocation evolution of non-oriented electrical steel

Systematic cyclic tests were conducted on 30WGP1600 non-oriented electrical steel under uniaxial stress control. The effects of mean stress, stress amplitude, and peak stress on the material's ratcheting behavior were analyzed. The evolution of dislocation configuration during ratcheting deformation was observed using TEM (Transmission Electron Microscopy), revealing the nature of ratcheting deformation in electrical steel. The accumulation of irreversible deformation in structural components under cyclic stress, known as the ratcheting effect, can lead to dimensional changes or fatigue failure, resulting in catastrophic consequences. For example, the rotor of an electric vehicle drive motor will experience ratcheting deformation under centrifugal force. Ratcheting deformation on one side...

2020-10-20 View Details →

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