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Vanadium-containing heavy-gauge weathering steel and rolling method thereof

A weather-resistant steel and thick-gauge technology, which is applied in the field of weather-resistant steel and its rolling, vanadium-containing thick-gauge weather-resistant steel and its rolling, can solve the problems of high cost and complex composition, and achieve low production cost, simple method, and improved The effect of overall performance

Active Publication Date: 2018-05-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its tensile strength is ≥900MPa, yield strength is ≥800MPa, and elongation is ≥18%, but it still needs to add Al and Mo elements, the composition is complex, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment is rolled on Panzhihua Iron and Steel 2050 hot rolling mill. Its production process is: steel billet → hot rolling → laminar cooling → coiling, the chemical composition weight percentage of steel billet is: C: 0.08%, Si: 0.30%, Mn: 1.31%, P: 0.011%, S: 0.003%, V: 0.08%, Cr: 0.35%, Ni: 0.12%, Cu: 0.22%. In the hot rolling step, the finish rolling start temperature is 952°C, and in the hot rolling step, the finish rolling temperature is 882°C; in the cooling step, the double-stage cooling interval is 6 seconds; in the coiling step, the temperature is 605°C.

[0050] The measured mechanical properties of vanadium-containing thick gauge weathering steel: Rel: 460MPa, Rm: 536MPa, A%: 30%; low temperature impact properties (-40°C): 145J.

Embodiment 2

[0052] This example is rolled on Panzhihua Iron and Steel 2050 hot rolling mill. Its production process is: steel billet → hot rolling → laminar cooling → coiling, the chemical composition weight percentage of steel billet is: C: 0.10%, Si: 0.40%, Mn: 1.42%, P: 0.010%, S: 0.005%, V: 0.10%, Cr: 0.38%, Ni: 0.15%, Cu: 0.25%. The starting temperature of finish rolling in the hot rolling step is 1003°C, and the finish rolling temperature in the hot rolling step is 900°C; the double-stage cooling interval in the cooling step is 8 seconds; the temperature in the coiling step is 632°C.

[0053] The measured mechanical properties of vanadium-containing thick gauge weathering steel: Rel: 482MPa, Rm: 545MPa, A%: 29%; low temperature impact properties (-40°C): 128J.

Embodiment 3

[0055] This example is rolled on Panzhihua Iron and Steel 2050 hot rolling mill. Its production process is: steel billet → hot rolling → laminar cooling → coiling, the chemical composition weight percentage of steel billet is: C: 0.11%, Si: 0.48%, Mn: 1.45%, P: 0.012%, S: 0.007%, V: 0.12%, Cr: 0.39%, Ni: 0.16%, Cu: 0.27%. In the hot rolling step, the finish rolling start temperature is 1048°C, in the hot rolling step, the finish rolling temperature is 918°C; in the cooling step, the double-stage cooling interval is 10 seconds; in the coiling step, the temperature is 657°C.

[0056] The measured mechanical properties of vanadium-containing thick gauge weathering steel: Rel: 490MPa, Rm: 563MPa, A%: 27%; low temperature impact properties (-40°C): 103J.

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Abstract

The invention belongs to the technical field of steel and relates to weather resistant steel and a rolling method thereof, in particular to vanadium-containing thick-gauge weather resistant steel and a rolling method thereof. The vanadium-containing thick-gauge weather resistant steel is prepared from, by weight, 0.12% or smaller of C, 0.50% or smaller of Si, 1.5% or smaller of Mn, 0.02% or smaller of P, 0.008% or smaller of S, 0.12% or smaller of V, 0.20-0.55% of Cu, 0.30-1.25% of Cr, 0.10-0.65% of Ni, the balance Fe and inevitable impurities. The thickness of the vanadium-containing thick-gauge weather resistant steel is larger than or equal to 14 mm. The vanadium-containing thick-gauge weather resistant steel is good in tenacity, no Mo or Al is added, the components are simple, and the cost is low.

Description

technical field [0001] The invention relates to a weathering steel and a rolling method thereof, in particular to a vanadium-containing thick gauge weathering steel and a rolling method thereof, and belongs to the technical field of iron and steel. Background technique [0002] Weather-resistant steel, also known as atmospheric corrosion-resistant steel, is a low-alloy steel made by adding a certain amount of alloying elements such as Cu, P, Cr, and Ni to ordinary steel. Weathering steel is characterized by its ability to resist corrosion under natural atmospheric conditions. [0003] Chinese patent application 201310214275.0 discloses a high-strength weathering steel whose chemical composition is (weight percent): 0.05%≤C≤0.06%, 0.25%≤Cu≤0.35%, 0.36%≤Si≤0.45%, 0.80%≤Mn ≤1.00%, 0.055%≤Al≤0.065%, 0.10%≤Ni≤0.19%, 0.41%≤Cr≤0.50%, 0.05%≤Mo≤0.15%, 0.01%≤Ti≤0.02%, 0.016%≤V≤0.030 %, 0.005%≤Nb≤0.010%, 0.005%≤B≤0.008%, S≤0.010%, P≤0.025%, N≤0.005%, and the balance is Fe. It adds A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/16C22C38/18C22C38/08C21D8/02
CPCC21D8/0226C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 李正荣崔凯禹汪创伟龚慧王羿刘序江王登刚
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP