Modified 700MPa grade high-strength weathering steel and method for preparing same

A weathering steel, high-strength technology, applied in the field of high-strength weathering steel production, can solve problems such as impact toughness decline

Inactive Publication Date: 2008-10-15
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using precipitation strengthening to increase the strength, although the strength of the steel can be doubled, the impact toughness of the steel will decrease significantly, especially the low-temperature impact performance: the impact absorption energy Akv of the half-size sample (5*10*55mm) at -20°C is only 20 ~22J
As the thickness of the product increases, the brittleness becomes more obvious, so the practical application of the thick gauge 700MPa high-strength weathering steel is greatly restricted, indicating that this technology improves the original yield strength of 345MPa weathering steel to the process conditions of 700MPa high-strength weathering steel Further research is needed to improve impact toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The main chemical components of molten steel after refining to prepare the improved 700MPa grade high-strength weathering steel described in this example are: C: 0.03wt.%, Si: 0.29wt.%, Mn: 1.51wt.%, P: 0.006wt.%, S: 0.003wt.%, Cr: 0.50wt.%, Ti: 0.14wt.%, Cu: 0.20wt.%, Ni: 0.10wt.%, N 0.006wt.%, the rest is Fe and unavoidable residual elements .

[0022] Rolling process parameters: billet entering soaking furnace temperature 900°C, furnace exit temperature 1100°C, final rolling temperature 880°C, coiling temperature 580°C.

[0023] See Table 1 for the low-temperature impact toughness and mechanical properties of the steel plate in Example 1.

[0024] Table 1 Low temperature impact toughness and mechanical properties of steel plate in Example 1

[0025] Steel plate thickness

Embodiment 2

[0027] The main chemical components of molten steel after refining when preparing the improved 700MPa high-strength weathering steel described in this example are: C: 0.05wt.%, Si: 0.15wt.%, Mn: 1.80wt.%, P: 0.009wt.%. , S: 0.004wt.%, Cr: 0.70wt.%, Ti: 0.12wt.%, Cu: 0.29wt.%, Ni: 0.22wt.%, N 0.007wt.%, the rest is Fe and unavoidable residual element.

[0028] Rolling process parameters: billet entering soaking furnace temperature 1000°C, furnace exit temperature 1180°C, final rolling temperature 930°C, coiling temperature 630°C.

[0029] See Table 1 for the low-temperature impact toughness and mechanical properties of the steel plate in Example 2.

[0030] Table 2 Low temperature impact toughness and mechanical properties of steel plate in Example 2

[0031] Steel plate thickness

Embodiment 3

[0033] The main chemical components of molten steel after refining when preparing the improved 700MPa high-strength weathering steel described in this example are: C: 0.07wt.%, Si: 0.10wt.%, Mn: 2.10wt.%, P: 0.020wt .%, S: 0.008wt.%, Cr: 0.40wt.%, Ti: 0.08wt.%, Cu: 0.40wt.%, Ni: 0.35wt.%, N 0.008wt.%, the rest is Fe and unavoidable residual elements.

[0034] Rolling process parameters: billet entering soaking furnace temperature 950°C, furnace exit temperature 1150°C, final rolling temperature 910°C, coiling temperature 590°C.

[0035] See Table 3 for the low-temperature impact toughness and mechanical properties of the steel plate in Example 3.

[0036] Table 3 Low temperature impact toughness and mechanical properties of the steel plate of Example 3

[0037] Steel plate thickness

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Abstract

The invention discloses an improved 700MPa level high strength weathering steel and a method for manufacturing the same. The improved 700MPa level high strength weathering steel is manufactured with a thin slab casting and rolling process, wherein the main chemical constituents of refined liquid steel are as follows: 0.03 to 0.07 weight percent of C, less than 0.3 weight percent of Si, 1.51 to 2.10 weight percent of Mn, less than or equal to 0.02 weight percent of P, less than or equal to 0.008 weight percent of S, 0.2 to 0.4 weight percent of Cu, 0.4 to 0.7 weight percent of Cr, 0.10 to 0.35 weight percent of Ni, 0.08 to 0.14 weight percent of Ti, and less than or equal to 0.008 weight percent of N. The improved 700MPa level high strength weathering steel has yield strength more than or equal to 700MPa, tensile strength more than or equal to 750 MPa, and extensibility more than or equal to 14 percent. The impact absorbing energy Akv of a half size sample (5 x10 x 55mm) at 20 DEG.C below zero is more than or equal to 33J.

Description

technical field [0001] The invention belongs to the technical field of high-strength weather-resistant steel production, in particular to an improved 700MPa high-strength weather-resistant steel and a preparation method thereof. Background technique [0002] The yield strength of 700MPa high-strength weathering steel is twice that of 345MPa ordinary weathering steel, and it is the product with the highest strength among high-strength weathering steels. After doubling the strength of weathering steel, it can significantly reduce the thickness of structural components of special transportation equipment and containers, while ensuring the safety and carrying capacity of the equipment, reducing manufacturing costs and improving transportation efficiency, so it is widely used. [0003] After several years of development, the researchers of the patent applicant Guangzhou Zhujiang Iron and Steel Co., Ltd. invented a 700MPa high-strength weathering steel based on the thin slab conti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58B21B1/26
Inventor 毛新平陈麒琳李春艳
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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