Jiangsu Suzhou Steel Group Co.

Suzhou Jiangsu, China

Jiangsu Suzhou Steel Group Co.

Suzhou Jiangsu, China
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Patent
Peking University, Suzhou Suxin Special Steel Co. and Jiangsu Suzhou Steel Group Co. | Date: 2013-12-03

A non quenched and tempered steel and manufacturing process thereof. The manufacturing process of the non quenched and tempered steel has a cooling step after the finish rolling step, wherein intense cooling and moderate cooling are carried out alternatively. The intense cooling can ensure the surface temperature of the steel to decrease rapidly; and the moderate cooling allows the core temperature of the steel to dissipate gradually to the surface; a further intense cooling is carried out to allow rapid heat dissipation. The intense cooling and the moderate cooling can be carried out alternately several times according to practical requirement. A water cooling mode combining intense cooling and moderate cooling allows the core temperature and the surface temperature of the steel to become the same within a short time, and thus ensures the uniformity of the mechanical properties of the steel and improves production efficiency.


Patent
Peking University, Suzhou Suxin Special Steel Co. and Jiangsu Suzhou Steel Group Co. | Date: 2016-08-03

A process for producing a non quenched and tempered steel. The process comprises a cooling step at least after a finish rolling step. In said cooling step, an intense cooling and a moderate cooling are carried out alternately to allow the steel to undergo at least two stages of water cooling, so that the core temperature and the surface temperature of the steel become the same within a specified time, and thus ensures the uniformity of the mechanical properties of the steel and improves the production efficiency.


Patent
Peking University, Suzhou Suxin Special Steel Co. and Jiangsu Suzhou Steel Group Co. | Date: 2013-12-03

A non quenched and tempered steel and manufacturing process thereof. The process comprises a cooling step after the finish rolling step; and the process utilizes alternate intense cooling and moderate cooling. The intense cooling can ensure the surface temperature of the steel to decrease rapidly; and the moderate cooling allows the core temperature of the steel to dissipate gradually to the surface; a further intense cooling is carried out to allow rapid heat dissipation. The intense cooling and the moderate cooling can be carried out alternately several times according to practical requirement. A water cooling mode combining intense cooling and moderate cooling allows the core temperature and the surface temperature of the steel to become the same within a short time, and thus ensures the uniformity of the mechanical properties of the steel and improves the production efficiency.


Patent
Peking University, Suzhou Suxin Special Steel Co. and Jiangsu Suzhou Steel Group Co. | Date: 2016-08-03

A non quenched and tempered steel and manufacturing process thereof. The process alters the cooling mode before finish rolling in previous production of non quenched and tempered steel; the process at least has a cooling step after the finish rolling step; in contrast to the cooling mode in the prior art which employs the cooling mode of single water cooling or consistent air cooling, the present process utilizes alternate intense cooling and moderate cooling. The intense cooling can ensure the surface temperature of the steel to decrease rapidly; and the moderate cooling allows the core temperature of the steel to dissipate gradually to the surface; a further intense cooling is carried out to allow rapid heat dissipation. The intense cooling and the moderate cooling can be carried out alternately several times according to practical requirement. A water cooling mode combining intense cooling and moderate cooling allows the core temperature and the surface temperature of the steel to become the same within a short time, and thus ensures the uniformity of the mechanical properties of the steel.


Patent
Peking University, Suzhou Suxin Special Steel Co. and Jiangsu Suzhou Steel Group Co. | Date: 2013-12-03

A non-quenched and tempered steel and manufacturing process thereof. The process alters the cooling mode before finish rolling in previous production of non-quenched and tempered steel; the process at least has a cooling step after the finish rolling step; the process utilizes alternate intense cooling and moderate cooling. The intense cooling can ensure the surface temperature of the steel to decrease rapidly; and the moderate cooling allows the core temperature of the steel to dissipate gradually to the surface; a further intense cooling is carried out to allow rapid heat dissipation. The intense cooling and the moderate cooling can be carried out alternately several times accordingly. A water cooling mode combining intense cooling and moderate cooling allows the core temperature and the surface temperature of the steel to become the same within a short time, the uniformity of the mechanical properties of the steel.


Patent
Peking University, Suzhou Suxin Special Steel Co. and Jiangsu Suzhou Steel Group Co. | Date: 2013-12-03

A process for producing a non quenched and tempered steel. The process comprises a cooling step at least after a finish rolling step. In said cooling step, an intense cooling and a moderate cooling are carried out alternately to allow the steel to undergo at least two stages of water cooling, so that the core temperature and the surface temperature of the steel become the same within a specified time, and thus ensures the uniformity of the mechanical properties of the steel and improves the production efficiency.


Patent
Peking University, Suzhou Suxin Special Steel Co. and Jiangsu Suzhou Steel Group Co. | Date: 2013-12-03

A non quenched and tempered steel and manufacturing process thereof. The process comprises a cooling step after the finish rolling step; and the process utilizes alternate intense cooling and moderate cooling. The intense cooling can ensure the surface temperature of the steel to decrease rapidly; and the moderate cooling allows the core temperature of the steel to dissipate gradually to the surface; a further intense cooling is carried out to allow rapid heat dissipation. The intense cooling and the moderate cooling can be carried out alternately several times according to practical requirement. A water cooling mode combining intense cooling and moderate cooling allows the core temperature and the surface temperature of the steel to become the same within a short time, and thus ensures the uniformity of the mechanical properties of the steel and improves the production efficiency.


Patent
Peking University, Suzhou Suxin Special Steel Co. and Jiangsu Suzhou Steel Group Co. | Date: 2016-08-03

A non quenched and tempered steel and manufacturing process thereof. The process comprises a cooling step after the finish rolling step; and the process utilizes alternate intense cooling and moderate cooling. The intense cooling can ensure the surface temperature of the steel to decrease rapidly; and the moderate cooling allows the core temperature of the steel to dissipate gradually to the surface; a further intense cooling is carried out to allow rapid heat dissipation. The intense cooling and the moderate cooling can be carried out alternately several times according to practical requirement. A water cooling mode combining intense cooling and moderate cooling allows the core temperature and the surface temperature of the steel to become the same within a short time, and thus ensures the uniformity of the mechanical properties of the steel and improves the production efficiency.


Patent
Peking University, Suzhou Suxin Special Steel Co. and Jiangsu Suzhou Steel Group Co. | Date: 2016-08-03

A non quenched and tempered steel and manufacturing process thereof. The manufacturing process of the non quenched and tempered steel has a cooling step after the finish rolling step, wherein intense cooling and moderate cooling are carried out alternatively. The intense cooling can ensure the surface temperature of the steel to decrease rapidly; and the moderate cooling allows the core temperature of the steel to dissipate gradually to the surface; a further intense cooling is carried out to allow rapid heat dissipation. The intense cooling and the moderate cooling can be carried out alternately several times according to practical requirement. A water cooling mode combining intense cooling and moderate cooling allows the core temperature and the surface temperature of the steel to become the same within a short time, and thus ensures the uniformity of the mechanical properties of the steel and improves production efficiency.


Tan L.,Jiangsu Suzhou Steel Group Co. | Zhou Z.,Jiangsu Suzhou Steel Group Co. | Liu P.,Great Wall Motor Company Ltd | Wen Y.-S.,Great Wall Motor Company Ltd | Bao Y.-Z.,Control Iron and Steel Research Institute, China
7th International Conference on High Strength Low Alloy Steels, HSLA Steels 2015, International Conference on Microalloying 2015, Microalloying 2015 and International Conference on Offshore Engineering Steels 2015, OES 2015 | Year: 2015

The dynamic recrystallization behaviors of the microalloyed non-quenching and tempering steels of 38MnVS and C38N2 were studied by the simulation of hot deformation in the Qeeble3800. The stress versus strain curves of both steels were measured at different deformation temperature and deformation strain rate. The relationship among deformation temperature, deformation strain rate and the peak stress was analysis to calculate the activation energy of the hot deformation. The dynamic recrystallization behaviors and the grain size measurements were identified based on the microstructural examination. The hot processing map and the hot deformation instability map were drawn based on the relationship among deformation strain rate, deformation temperature and the peak stress to optimize the hot deformation parameters. Both 38MnVS and C38N2 was processed by the controlled forging and controlling cooling process (CFCC-process), it was pointed out that Nb plays an important role in the dynamic recrystallization and the processing of the non-quenching and tempering steels.

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