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Manufacturing method of high-toughness hot-rolled plate coil for welded gas cylinder

A technology for hot-rolled coils and steel for gas cylinders is applied in the field of manufacturing hot-rolled coils of high-toughness welded steel for gas cylinders, and can solve the problem of reducing the impact toughness level and stability of low-carbon bainitic steel, high cost, The strength and toughness of steel coils are difficult to control, so as to achieve the effect of uniform structure and excellent performance

Active Publication Date: 2014-03-19
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main chemical components of common-grade steel for welding gas cylinders are: carbon, silicon, manganese, phosphorus, and sulfur, and a relatively high content of Mo, B, V, and rare earth elements are added, and the cost of Mo, B, V, and rare earth elements is relatively high. , which is not conducive to reducing the cost of steel for welding gas cylinders, and the addition of vanadium will significantly reduce the level of impact toughness and stability of low-carbon bainitic steel
In addition, it is difficult to control the strength and toughness of steel coils produced by ordinary welding gas cylinder steel manufacturing processes, which affects the market competitiveness of welded gas cylinder steel

Method used

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  • Manufacturing method of high-toughness hot-rolled plate coil for welded gas cylinder
  • Manufacturing method of high-toughness hot-rolled plate coil for welded gas cylinder
  • Manufacturing method of high-toughness hot-rolled plate coil for welded gas cylinder

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Effect test

Embodiment 1

[0031] The manufacturing method of the hot-rolled coil of steel for the high-toughness welded gas cylinder, the composition ratio of the hot-rolled coil is shown in Table 1;

[0032] The manufacturing process of hot-rolled coils is: smelting - molten iron pretreatment - LF furnace refining - continuous casting - heating - rolling - coiling;

[0033] The smelting is carried out in the converter, the smelting control P is 0.013%, the final furnace temperature is 1620°C, the slag blocking operation is strengthened during the smelting process, and the slag amount is 4kg / t;

[0034] The molten iron pretreatment control S is 0.005%, the front slag removal and the rear slag removal, and the bright side of the rear slag removal is 88%;

[0035] The LF furnace refining control S is 0.010%, and the white slag operation ensures the full reduction of ladle top slag. Ensure that the total weak stirring time before and after feeding the calcium line is 12 minutes;

[0036] Heating tempera...

Embodiment 2

[0041] The manufacturing method of the hot-rolled coil of steel for the high-toughness welded gas cylinder, the composition ratio of the hot-rolled coil is shown in Table 1;

[0042] The manufacturing process of hot-rolled coils is: smelting - molten iron pretreatment - LF furnace refining - continuous casting - heating - rolling - coiling;

[0043] The smelting is carried out in a converter, the smelting control P is 0.012%, and the final furnace temperature is 1635°C. During the smelting process, the operation of tapping and slag is strengthened, and the amount of slag is 3.5kg / t;

[0044] Hot metal pretreatment control S is 0.004%, front slag removal and rear slag removal, the bright side of rear slag removal is 90%;

[0045] The LF furnace refining control S is 0.008%, and the white slag operation ensures the full reduction of ladle top slag. Ensure that the total weak stirring time before and after feeding the calcium line is 13 minutes;

[0046] Heating temperature and...

Embodiment 3

[0051] The manufacturing method of the hot-rolled coil of steel for the high-toughness welded gas cylinder, the composition ratio of the hot-rolled coil is shown in Table 1;

[0052] The manufacturing process of hot-rolled coils is: smelting - molten iron pretreatment - LF furnace refining - continuous casting - heating - rolling - coiling;

[0053] The smelting is carried out in the converter, the smelting control P is 0.012%, the final furnace temperature is 1630°C, the operation of tapping and slag is strengthened during the smelting process, and the slag amount is 3.2kg / t;

[0054] Hot metal pretreatment control S is 0.004%, front slag removal and rear slag removal, the bright side of rear slag removal is greater than 85%;

[0055] The LF furnace refining control S is 0.007%, and the white slag operation ensures the full reduction of ladle top slag. Ensure that the total weak stirring time before and after feeding the calcium line is 14 minutes;

[0056] Heating temperat...

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Abstract

The invention discloses a manufacturing method of a high-toughness hot-rolled plate coil for a welded gas cylinder. The hot-rolled plate coil comprises the following components in percentage by weight: 0.045-0.095% of carbon, 0.20-0.28% of silicon, 1.30-1.50% of manganese, less than or equal to 0.015% of phosphorus, less than or equal to 0.005% of sulfur, 0.020-0.050% of niobium, 0.015-0.030% of titanium, 0.035-0.040% of aluminum and the balance of iron and trace impurities; and the manufacturing technology of the hot-rolled plate coil comprises the steps of smelting, pretreatment of molten iron, refining in an LF furnace, continuous casting, heating, rolling and coiling. In the method disclosed by the invention, the three key links from composition design, rolling to smelting are strictly controlled; and the yield strength of the obtained hot-rolled plate coil is 350-500MPa, the tensile strength is 510-600MPa, the ratio of the yield strength to tensile strength is less than or equal to 0.80, the Charpy impact energy at -20 DEG C is 150J, and the Charpy impact shear area (SA%) at -20 DEG C is 100%.

Description

technical field [0001] The invention relates to high-toughness low-alloy controlled-rolling and controlled-cooling steel, which is mainly used for manufacturing various steel welding gas cylinders such as liquid chlorine and liquid ammonia, and specifically relates to a manufacturing method of hot-rolled steel coils for high-toughness welding gas cylinders. Background technique [0002] The welding cylinder and gas cylinder manufacturing industry has continuously put forward higher requirements for the strength, toughness and weldability of welded cylinder steel, and this development momentum will continue in the next few decades. [0003] With the advancement of metallurgical technology and the development of microalloyed steel, the production of welded bottle steel with high strength, high toughness and good weldability has become a reality. [0004] At present, the main chemical components of common-grade steel for welding gas cylinders are: carbon, silicon, manganese, ph...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 王海波朱涛王立涛胡学文王炜王莹赵勇赵伟隽李忠义王晓燕金宝安章海
Owner MAGANG (GROUP) HOLDING CO LTD
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