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High-strength anti-fatigue atmospheric corrosion resistant hot-rolled steel strip and method for producing same

A technology of atmospheric corrosion resistance and manufacturing method, applied in metal rolling and other directions, can solve problems such as poor fatigue resistance, and achieve the effects of excellent atmospheric corrosion resistance, good fatigue resistance, and good strength and toughness matching.

Active Publication Date: 2010-06-30
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Research on the Performance of High-Strength Weathering Steel Welded Joints" (hereinafter referred to as Document ①), published in the supplementary issue of "Baosteel Technology" in 2005, provided a fatigue performance of high-strength atmospheric corrosion-resistant steel welded joints, but its performance under the stress level of 450MPa The fatigue life is 0.6~1.8×10 6 times, the fatigue life under the stress level of 485MPa is only 0.14~0.31×10 6 Second, poor fatigue resistance

Method used

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  • High-strength anti-fatigue atmospheric corrosion resistant hot-rolled steel strip and method for producing same
  • High-strength anti-fatigue atmospheric corrosion resistant hot-rolled steel strip and method for producing same
  • High-strength anti-fatigue atmospheric corrosion resistant hot-rolled steel strip and method for producing same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The high-strength anti-fatigue and atmospheric corrosion-resistant hot-rolled steel strip of this embodiment has a thickness of 4.0mm, and the mass percentage ratio of the chemical components is:

[0045] C: 0.055Si: 0.42Mn: 1.10P: 0.008S: 0.004

[0046] Cr: 0.70Ni: 0.23Cu: 0.42Nb+V+Ti: 0.08, the rest is Fe and unavoidable impurities.

[0047] The test results of the mechanical properties and formability of the hot-rolled steel strip in this embodiment are shown in Table 2, the results of the atmospheric corrosion resistance test are shown in Table 3, the evaluation results of non-metallic inclusions and grain size are shown in Table 4, the welding method of the welded joint, the welding material and The results of the fatigue performance test are shown in Table 5.

Embodiment 2

[0049] The high-strength anti-fatigue and atmospheric corrosion-resistant hot-rolled steel strip of this embodiment has a thickness of 8.0mm, and the mass percentage ratio of the chemical components is:

[0050] C: 0.061Si: 0.45Mn: 1.30P: 0.009S: 0.003

[0051] Cr: 0.69Ni: 0.22Cu: 0.40Nb+V+Ti: 0.10, the rest is Fe and unavoidable impurities.

[0052] The test results of the mechanical properties and formability of the hot-rolled steel strip in this embodiment are shown in Table 2, the results of the atmospheric corrosion resistance test are shown in Table 3, the evaluation results of non-metallic inclusions and grain size are shown in Table 4, the welding method of the welded joint, the welding material and The results of the fatigue performance test are shown in Table 5.

[0053] Table 2

[0054]

[0055] table 3

[0056]

[0057] Table 4

[0058]

[0059] table 5

[0060]

Embodiment 3

[0062] The high-strength anti-fatigue and atmospheric corrosion-resistant hot-rolled steel strip of this embodiment has a thickness of 14.0mm, and the mass percentage ratio of the chemical components is:

[0063] C: 0.056Si: 0.39Mn: 1.40P: 0.009S: 0.003

[0064] Cr: 0.73Ni: 0.21Cu: 0.43Nb+V+Ti: 0.13, the rest is Fe and unavoidable impurities.

[0065] Manufacturing method embodiment one

[0066] What the present embodiment made was the steel strip embodiment one, and the manufacturing method of the present embodiment comprises the following steps in sequence:

[0067] A preparation of continuous casting slab

[0068] Through hot metal pretreatment desulfurization, 180-ton top-bottom compound blowing converter smelting, LF refining and slab continuous casting, the mass percentage ratio of the chemical composition of the continuous casting billet obtained is:

[0069] C: 0.055Si: 0.42Mn: 1.10P: 0.008S: 0.004

[0070] Cr: 0.70Ni: 0.23Cu: 0.42Nb+V+Ti: 0.08, the rest is Fe and ...

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Abstract

The invention relate to high-strength anti-fatigue atmospheric corrosion resistant hot-rolled steel strip and a method for producing the same. The hot-rolled steel strip comprises the following chemical components by weight percent: 0.10 percent of C or less, 0.25-0.60 percent of Si, 0.80-1.45 percent of Mn, 0.020 percent of P or less, 0.008 percent of S, 0.35-1.00 percent of Cr, 0.15-0.55 percent of Ni, 0.25-0.50 percent of Cu, 0.22 percent of Nb, V and Ti and the balance of Fe and inevitable impurities. The method for producing the hot-rolled steel strip comprises the following steps: A, preparing continuously cast steel billet by pre-treating and desulfurizing molten iron, smelting the molten iron in a top and bottom composite blowing rotating furnace, refining the molten iron in an ladle furnace (LF) and continuously casting a thick steel billet; and B, finally rolling the continuously cast steel billet into a hot-rolled steel billet at 790-890 DEG C, rapidly cooling the hot-rolled steel billet in water to 450-650 DEG C, winding the hot-rolled steel billet, and cooling the winded hot-rolled steel billet to room temperature. The high-strength anti-fatigue atmospheric corrosion resistant hot-rolled steel strip produced with the method has excellent atmospheric corrosion resistance, and the welded component produced from the raw material of high-strength anti-fatigue atmospheric corrosion resistant hot-rolled steel strip has good anti-fatigue performance.

Description

technical field [0001] The invention relates to a high-strength anti-fatigue and atmospheric corrosion-resistant hot-rolled steel strip and a manufacturing method thereof. Background technique [0002] Atmospheric corrosion-resistant steel is mainly used to manufacture structural parts that require atmospheric corrosion resistance, such as containers, railway vehicles, corrosion-resistant parts of power plant boilers, oil derricks, and construction machinery. Among them, the railway industry is one of the most important application fields of atmospheric corrosion-resistant steel. The main development trend of railway vehicles is high speed and heavy load. Improving the strength of steel to reduce the weight of vehicles is an important means to achieve this goal. In addition to requiring high strength, the atmospheric corrosion-resistant steel for railway vehicles is also required to have high toughness Atmospheric corrosion performance, formability, welding performance, fati...

Claims

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Application Information

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IPC IPC(8): C22C38/50B21B1/46
Inventor 辛建卿王立新邓江波
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD