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High-toughness 35Kg-grade steel plate for building structure and production method of high-toughness 35Kg-grade steel plate

A technology of building structure and production method, applied in the field of medium and heavy plate manufacturing, can solve problems such as difficulty, and achieve the effects of uniform cooling, stable performance and improved safety

Pending Publication Date: 2022-05-24
天津市新天钢钢铁集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a lower carbon content will lead to an increase in ferrite content and a decrease in pearlite content, which will significantly increase the yield ratio. It is difficult to ensure the yield ratio ≤ 0.80

Method used

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  • High-toughness 35Kg-grade steel plate for building structure and production method of high-toughness 35Kg-grade steel plate
  • High-toughness 35Kg-grade steel plate for building structure and production method of high-toughness 35Kg-grade steel plate
  • High-toughness 35Kg-grade steel plate for building structure and production method of high-toughness 35Kg-grade steel plate

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Experimental program
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Effect test

Embodiment 1

[0040] The production process of the steel plate in this embodiment is: blast furnace molten iron → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refining → VD refining → slab continuous casting → slab reheating → slab descaling → 3500 mill rolling → straightening Straightening → laminar cooling → straightening → air cooling → finished product sampling inspection → storage.

[0041] Specifically: molten steel is smelted on a 120t converter, and the molten steel is cast into a slab with a thickness of 250mm; the continuous casting slab is reheated to a temperature of 1162 °C; rolling after the continuous casting slab is released: the rough rolling temperature is 1141 °C, and the final rolling temperature is 1036 °C , the thickness of the intermediate billet is 70mm; the finishing rolling temperature is 906 ℃, the final rolling temperature is 854 ℃, and the steel plate is rolled into a 20mm;

[0042] The chemical quality components of the finis...

Embodiment 2

[0048] The production process of the steel plate in this embodiment is: blast furnace molten iron → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refining → VD refining → slab continuous casting → slab reheating → slab descaling → 3500 mill rolling → straightening Straightening → laminar cooling → straightening → air cooling → finished product sampling inspection → storage.

[0049] Specifically: molten steel is smelted on a 120t converter, and the molten steel is cast into a slab with a thickness of 250mm; the continuous casting slab is reheated and the temperature is 1164 °C; the rolling after the continuous casting slab is released: the rough rolling temperature is 1149 °C, and the final rolling temperature is 1051 °C , the thickness of the intermediate billet is 82mm; the finishing rolling temperature is 862℃, the final rolling temperature is 838℃, and the steel plate is rolled into 36mm;

[0050] The chemical quality components of the fi...

Embodiment 3

[0055] The production process of the steel plate in this embodiment is: blast furnace molten iron → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refining → VD refining → slab continuous casting → slab reheating → slab descaling → 3500 mill rolling → straightening Straightening → laminar cooling → straightening → air cooling → finished product sampling inspection → storage.

[0056] Specifically: molten steel is smelted on a 120t converter, and the molten steel is cast into a slab with a thickness of 250mm; the continuous casting slab is reheated to a temperature of 1164 °C; rolling after the continuous casting slab is released: the rough rolling temperature is 1145 °C, and the final rolling temperature is 1043 °C , the thickness of the intermediate billet is 110mm; the finishing rolling temperature is 831 ℃, the final rolling temperature is 826 ℃, and the steel plate is rolled into a 60mm;

[0057] The chemical quality components of the fini...

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Abstract

The invention belongs to the field of medium-thickness plate manufacturing, and provides a high-toughness 35Kg-grade steel plate for a building structure and a production method of the high-toughness 35Kg-grade steel plate. The production method comprises the steps of blast furnace molten iron preparation, molten iron pre-desulfurization, converter smelting, deoxidation alloying, LF refining, VD refining, slab continuous casting, slab reheating, slab descaling, 3500 rolling mill rolling, straightening, laminar cooling, straightening, air cooling, finished product sampling inspection and warehousing. According to the method, the 35Kg-grade building structure steel plate with the thickness of 8-60 mm can be produced by adopting a continuous casting billet with the thickness of 250 mm, the highest carbon content of the steel plate is 0.14 wt%, it can be guaranteed that the strength of the steel plate meets the requirement, the yield ratio is smaller than or equal to 0.80, it can be guaranteed that the low-temperature impact toughness at the temperature of-40 DEG C is larger than or equal to 120 J and far exceeds the basic requirement of the national standard, and the thickness direction performance, the flaw detection performance and the welding performance of Z35 can also be guaranteed.

Description

technical field [0001] The invention belongs to the field of medium and heavy plate manufacturing, and in particular relates to a high toughness 35Kg grade steel plate for building structures and a production method thereof. Background technique [0002] With the continuous improvement of my country's steel supply, technology and quality, the materials used in buildings are changing from concrete to steel structures. Compared with concrete structures, steel structures have a series of advantages such as light weight, large span, short construction period, prefabrication in factories, and easy recycling. More and more steel structures are used in high-rise buildings, large-span exhibition centers, railway stations, industrial plants and other buildings in my country, and the technical requirements for steel plates are also getting higher and higher. [0003] In order to ensure the safety of building structures, GB19879 requires building structural steel plates to have high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02C22C33/06
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/06C21D8/0205C21D8/0221C21D2211/005C21D2211/002C21D2211/009Y02W30/91
Inventor 徐洪庆俞飞闫文凯李文双宋欣苏安龙骆春民徐振坤
Owner 天津市新天钢钢铁集团有限公司
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