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A special steel enterprise specializing in the production, research and development and sales of high alloy steel forgings

Identification Method of Quenching Crack and Non-Quenching Crack

Identification Method of Quenching Crack and Non-Quenching Crack

Quenching crack is a common quenching defect, which is caused by many reasons. Since the defects of heat treatment start from the product design, the work of preventing cracks should start from the product design. It is necessary to correctly select materials, reasonably carry out structural design, put forward appropriate heat treatment technical requirements, properly arrange the process route, select reasonable heating temperature, holding time, heating medium, cooling medium, cooling method and operation mode.

03

2022

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11

Advantages of Electric Arc Furnace Bottom Blowing Technology (DPP)

Advantages of Electric Arc Furnace Bottom Blowing Technology (DPP)

The electric arc furnace bottom blowing technology (DPP) was first applied on the 110t electric arc furnace of Thyssen Special Steel Company in Germany in 1980, with the following advantages.

03

2022

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11

Basic knowledge of normalizing, annealing, quenching and tempering

Basic knowledge of normalizing, annealing, quenching and tempering

The normalizing is a process in which the sub-co-analysis steel is heated to Ac3 30~50 ℃, the co-analysis steel is heated to Ac1 30~50 ℃, and the over-co-analysis steel is heated to Accm 30~50 ℃ and then air cooled. The normalizing cooling rate is larger than that of annealing.

03

2022

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11

Tonggang Rolling Steel Successfully Rolled 180 Billets This Year

Tonggang Rolling Steel Successfully Rolled 180 Billets This Year

Since the beginning of this year, the steel rolling division of Shougang Tonggang has been guided by market demand, continuously promoting the upgrading of product structure and actively broadening the rolling blank type.

14

2021

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12

This steel wire products to add "new chips"

This steel wire products to add "new chips"

A few days ago, through the full cooperation of various processes, Bengang Beiying Steel Rolling Plant successfully developed rolled wire φ5.5mm welding wire products.

14

2021

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12

Jiuquan Steel Successfully Developed Cold Heading Steel Coil for Fasteners

Jiuquan Steel Successfully Developed Cold Heading Steel Coil for Fasteners

Screws, nuts, hex bolts... These seemingly "inconspicuous" parts are the key materials for reliable and efficient operation of mechanical equipment.

14

2021

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12

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