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
CN103643120AActive Publication Date: 2014-03-19MAGANG (GROUP) HOLDING CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
MAGANG (GROUP) HOLDING CO LTD
Publication Date
2014-03-19

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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%.
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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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