Steel with stable oxide layer for pretreatment-free high-strength container and manufacture method of steel

A manufacturing method and oxide layer technology, applied in the field of hot-rolled strip production, can solve problems such as increased manufacturing costs, low yield strength of weather-resistant steel plates, influence on steel plate welding performance and low-temperature impact performance, and achieve the effect of improving corrosion resistance

Active Publication Date: 2013-07-10
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of V increases the manufacturing cost and affects the welding performance and low temperature impact performance of the steel plate
Moreover, the yield strength of the weather-resistant steel plate produced by this patent is as low as 483~518MPa

Method used

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  • Steel with stable oxide layer for pretreatment-free high-strength container and manufacture method of steel
  • Steel with stable oxide layer for pretreatment-free high-strength container and manufacture method of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The thickness of the slab in Example 1 is 230mm, and the thickness of the finished product is 4mm. During refining in the LF furnace, the speed of feeding the calcium wire is controlled at 4.0m / s, and the Ca / Al ratio is controlled at 0.11 before the calcium treatment; Controlled at 1250°C, the exit temperature of rough rolling at 1050°C, the number of rough rolling passes is 5, and all 5 passes of rough rolling are descaled; the cumulative reduction is 70%, and the starting temperature of the finishing mill is controlled at 980°C, finish rolling temperature at 820°C, rolling speed 8.5m / s, cumulative reduction 80%, each stand of finishing rolling is lubricated rolling, and the surface roughness Ra of the rolls at the end stand of the finishing mill is controlled at 1.8μm ;The relaxation cooling time of the steel plate in the finishing rolling unit is 30S, the cooling speed is controlled at 35℃ / S, and the coiling temperature is controlled at 450℃. , and then heat-preserve...

Embodiment 2

[0023] The thickness of the slab in Example 2 is 230mm, and the thickness of the finished product is 4mm. During refining in the LF furnace, the calcium wire feeding speed is controlled at 3.8m / s, and the Ca / Al ratio is controlled at 0.12 before the calcium treatment; Controlled at 1220°C, the exit temperature of rough rolling is 1020°C, the rolling pass of rough rolling is 4 passes, all 4 passes of rough rolling are descaled, and the cumulative reduction is 75%; the starting temperature of finishing mill is controlled at 950°C, finish rolling temperature at 800°C, rolling speed 7.5m / s, cumulative reduction 85%, each stand of finishing rolling is lubricated rolling, and the surface roughness Ra of the rolls at the end stand of the finishing mill is controlled at 1.5μm ;The relaxation cooling time of the steel plate in the finishing rolling unit is 40S, the cooling rate is 25°C / S, and the coiling temperature is controlled at 450°C. After coiling, the steel coil is transferred to...

Embodiment 3

[0024] The thickness of the slab in Example 3 is 230mm, and the thickness of the finished product is 2.0mm. During refining in the LF furnace, the feeding speed of the calcium wire is controlled at 4.8m / s, and the Ca / Al ratio is controlled at 0.10 before the calcium treatment; The temperature is controlled at 1250°C, the exit temperature of rough rolling is 1050°C, the rolling pass of rough rolling is 5 passes, all 5 passes of rough rolling are descaled, and the cumulative reduction is 80%; the starting temperature of the finishing mill is controlled At 980°C, the finish rolling temperature is 850°C, the rolling speed is 12m / s, and the cumulative reduction is 80%. Each stand of the finish rolling is lubricated rolling, and the surface roughness Ra of the rolls of the last stand of the finish rolling mill is controlled at 1.8μm ;The relaxation cooling time of the steel plate in the finishing rolling unit is 30S, and the cooling rate is 25°C / S; the coiling temperature is controll...

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Abstract

The invention discloses steel with a stable oxide layer for a pretreatment-free high-strength container and a manufacture method of the steel disclosed by the invention. The steel disclosed by the invention comprises the following chemical components in percentage by weight: 0.01-0.03% of C, 0.05-0.25% of Si, 1.4-1.6% of Mn, less than or equal to 0.008% of S, less than or equal to 0.05% of P, 0.25-0.40% of Cu, 0.25-0.50% of Cr, 0.22-0.30% of Ni, 0.02-0.03% of Nb and the balance of iron and inevitable impurities. The manufacture method of the steel disclosed by the invention is carried out according to the general pure steel process and comprises the following steps of: desulfurizing molten iron, smelting via a converter, refining via an LF (ladle furnace), refining via an RH (Rockwell Hardness) furnace, heating plate blanks, performing hot continuous rolling, cooling back section and reeling. The practice proves that the steel disclosed by the invention has the advantages of good integral corrosion resistance and high strength; meanwhile, the steel disclosed by the invention can be directly used for coating in the process of manufacturing the container without the pre-treating non-environmentally friendly pretreatment processes of blasting sand and blasting shots and has no negative influence on the coating quality and the coating property; and an oxide iron layer and a coating system are closely combined, so that the steel is good in compatibility. The manufacture method of the steel disclosed by the invention is simple in process flows and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of production of hot-rolled strips, and in particular refers to a steel with a stable oxide layer and a pretreatment-free high-strength container and a manufacturing method thereof. Background technique [0002] Steel products are exposed to the air for a long time, and the steel materials used will be corroded by moisture, gas, microorganisms, etc. in the environment, and the working and application environments of containers and ships sailing at sea are even harsher. In order to reduce the weight of the box body, increase the impact resistance, and increase the loading weight, container manufacturers have begun to use high-strength steel to manufacture containers. In order to make the high-strength container steel achieve good weather resistance, more precious metals such as Cu, Ni, Cr, Mo or rare earth are generally added, and the surface is coated with paint to further prevent its corrosion and prolong i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/48C21D7/13
Inventor 杨奕韩斌蒋扬虎刘洋谭文汪水泽汪荣魏兵陈丽娟
Owner 武汉钢铁有限公司
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