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Weather-resistant hot-rolled steel sheet superior high-strength, and manufacturing method

a technology of hot-rolled steel and high-strength, which is applied in the direction of metal rolling arrangement, etc., can solve the problems of inability to meet the requirements of high-strength steel, and achieve the effects of reducing transportation costs, high strength, and reducing the thickness of materials

Inactive Publication Date: 2010-04-15
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]Recently, as steels used to manufacture containers, high-strength steel materials have been widely used to reduce the thickness of the materials. As large-sized containers are manufactured to reduce transportation costs, there is an increasing need for a technique to obtain high strength. The invention relates to a technique that improves strength of materials used in order to cope with a change in container manufacturing industries. When compared with materials having a tensile strength of 500 MPa and an yield strength of 350 MPa in the related art, a reduction in weight and an increase in size of containers can be obtained by using steel materials having a tensile strength of 800 MPa and an yield strength of 700 MPa, and the steel materials may be used for various purposes.

Problems solved by technology

However, since the large-sized containers need to be structurally stabilized, high-strength steels are inevitably required.

Method used

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Examples

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Comparison scheme
Effect test

example

[0040]Hot rolled steel sheets are manufactured by hot rolling steels, shown in Table 1, under the conditions of Table 2. Mechanical properties and workability of the hot-rolled steel sheets are evaluated, and results of the evaluation are shown in Table 2.

TABLE 1Chemical components (weight %)CMnSiPSCuCrNiNbTiMoA10.071.90.20.0130.0040.350.750.25—0.070.02A20.051.80.20.0140.003———0.040.08—B10.072.00.210.0150.0030.300.600.150.050.09—B20.052.30.230.0120.0020.320.650.200.040.10—B30.062.50.200.0110.0030.450.720.210.060.10—B40.072.10.220.0100.0040.350.500.230.050.08—C10.041.80.210.0150.0050.380.620.180.040.06—C20.042.60.210.0130.0030.440.780.210.030.09—C30.082.70.190.0100.0020.520.640.250.030.06—C40.081.50.200.0110.0030.350.660.190.020.07—C50.041.80.230.0120.0030.330.920.260.080.12—C60.062.30.200.0110.0020.480.720.220.060.09—C70.072.40.200.0110.0020.480.720.220.040.10—

TABLE 2Hot rolling conditionsTensile characteristicsFinishCoilingYieldTensileElon-90°temperaturetemperaturestrengthstrengthg...

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Abstract

There are provided a high-strength hot-rolled steel sheet having excellent weather resistance used for containers and a method of manufacturing the same. A high-strength hot-rolled steel sheet having excellent weather resistance includes, by weight: C: 0.05 to 0.07%, Mn: 2.5% or less, Nb: 0.04 to 0.06%, Ti: 0.08 to 0.10%, Cu: 0.30 to 0.60%, Cr: 0.5 to 1.0%, and Ni: 0.15 to 0.30%, and the balance of Fe and other inevitable impurities. A method of manufacturing the hot-rolled steel sheet is also provided. A hot-rolled steel sheet provided has weather resistance by addition of Cu, Cr, and Ni and material characteristics of a tensile strength within the range of 800 to 900 MPa and a yield strength within the range of 700 to 800 MPa.

Description

TECHNICAL FIELD[0001]The present invention relates to a high-strength hot-rolled steel sheet with excellent weather resistance used for a container and a method of manufacturing the same, and more particularly, to a hot-rolled steel sheet that maintains weather resistant characteristics and realizes high-strength characteristics, and a method of manufacturing the same.BACKGROUND ART[0002]Containers are used to transport contents at short and long distances. Recently, the function of steels has been reinforced to reduce transportation costs or increase life spans of containers. To this end, the weight of the containers has been reduced. In order to reduce the thickness of applied steels, the strength of the steels is increased and a weather-resistant function is required for long-term preservation.[0003]In the past, aluminum was used to manufacture containers, but steels are now used due to low manufacturing costs. In particular, for the large-sized containers the strength of structu...

Claims

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Application Information

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IPC IPC(8): C22C38/42C22C38/02C22C38/04C22C38/58C22C38/14C22C38/50C22C38/48C22C38/12C22C38/44B21B23/00B21D11/14
CPCC22C38/42C22C38/50C22C38/48C22C38/58
Inventor JEONG, KEE JOKIM, GYO SUNGKIM, JAI IKPARK, CHUL JULEE, JAE KON
Owner POHANG IRON & STEEL CO LTD