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Chromium-free weather-resistant steel

A technology of weathering steel and H-beam, applied in the field of metallurgical engineering, can solve the problems of toxicity, increase production cost, unfavorable application and popularization of weathering steel, etc., and achieve the effect of simple and easy rolling process and excellent performance.

Active Publication Date: 2013-06-12
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the current weathering steel is mainly designed by adding corrosion-resistant copper, phosphorus, chromium, nickel, molybdenum and other alloying elements. In order to improve corrosion resistance and reduce cracking defects caused by copper elements on the steel surface, it is necessary to add Valuable chromium and nickel elements, and chromium elements are extremely toxic to the human body in the state of +6 valence, which increases production costs and is not conducive to the application and promotion of weathering steel

Method used

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  • Chromium-free weather-resistant steel
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  • Chromium-free weather-resistant steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Chromium-free weathering steel, characterized in that the chemical composition of the steel is as follows by mass %:

[0048]

[0049] The steel grade of the present invention is delivered in a hot-rolled state. Its technological process is respectively:

[0050] H-beam production process:

[0051] After the molten iron is pre-desulfurized, it is transported to the converter for smelting, and LF refining is used to make the composition of the steel grade meet the composition requirements of the steel grade of the present invention; after refining, it enters the continuous casting process of near-net-shaped profiled billets to produce H-shaped near-net-shaped continuous casting blanks ; The billet enters the heating furnace by cold charging or hot charging and hot delivery. Heating to 1220°C and then descaling with high-pressure water, the billet after descaling is sent to the BD roughing mill and TM finishing mill through the roller table for rolling, and the tempe...

Embodiment 2

[0057] Chromium-free weathering steel, characterized in that the chemical composition of the steel is as follows by mass %:

[0058]

[0059] Table 2 The steel grades of the present invention are delivered in a hot-rolled state. Its technological process is respectively:

[0060] H-beam production process:

[0061] After the molten iron is pre-desulfurized, it is transported to the converter for smelting, and LF refining is used to make the composition of the steel grade meet the composition requirements of the steel grade of the present invention; after refining, it enters the continuous casting process of near-net-shaped profiled billets to produce H-shaped near-net-shaped continuous casting blanks ; The billet enters the heating furnace by cold charging or hot charging and hot delivery. Heating to 1220°C and then descaling with high-pressure water, the billet after descaling is sent to the BD roughing mill and TM finishing mill through the roller table for rolling, and...

Embodiment 3

[0067] Corrosion resistance of chrome-free weathering steels in industrial atmospheres.

[0068] 1) Weight gain experiment. The corrosion test of the product steel of the present invention is a dry-wet alternating accelerated corrosion test, the test is 30 accelerated corrosion cycles, the corrosion time of each cycle is 24h, and the corrosion environment: 0.52% NaHSO 3 The solution has a pH value of 4.0, a humidity of 60RH, and a constant temperature of 30°C. The weather resistance of steel is tested by corrosion weight gain. The test data are shown in the table below:

[0069]

Weight gain ΔW, g / cm 2

Corten-A

0.00839

Example 1

0.00786

Example 2

0.00823

[0070] 2) Determination of electrochemical corrosion potential.

[0071] The electrochemical test adopts a three-electrode system: the working electrodes have an area of ​​10×10mm 2 The bare plate electrode and the rusted electrode prepared after 30 alternating...

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Abstract

The invention belongs to the field of metallurgical manufacturing, and relates to components and a manufacturing method of low-cost weather-resistant steel. The steel comprises the following chemical components in percentage by mass: 0.06 to 0.16 percent of C, 0.10 to 0.55 percent of Si, 0.80 to 1.70 percent of Mn, 0.020 to 0.065 percent of P, less than or equal to 0.015 percent of S, 0.15 to 0.25 percent of Cu, less than or equal to 0.30 percent of Ni, less than or equal to 0.075 percent of Nb, 0.002 to 0.005 percent of B and the balance of Fe and inevitable impurities. The main elements of the steel are alloying elements such as C, Si, Mn, P, S, Cu, Ni, Nb, B and the like, and the balance is Fe; the steel is smelted, rolled and cooled to form a finished product, the subsequent heat treatment process is not needed, and the steel has high weather resistance and mechanical property; and the product is non-hardened and tempered steel, and is mainly used as the structural steel of buildings, bridges and the like.

Description

technical field [0001] The invention belongs to the field of metallurgical engineering, and relates to a steel grade resistant to coastal atmosphere or industrial atmosphere and a manufacturing method thereof. The products are mainly H-shaped steel or strip products. Background technique [0002] With the steady growth of steel production and the deepening of global application technology research, the country pays more and more attention to creating an energy-saving society. With the rapid development of industry, air pollution is becoming more and more serious, and people are paying more and more attention to sulfur compounds Steel corrosion problems caused by major pollutants such as chemical compounds and halogen compounds, especially severe corrosion of building steel structures caused by flying salt particles in coastal areas. New requirements are placed on the corrosion resistance of steel, and it is hoped that the cost will not change significantly. The new nationa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16
Inventor 张思勋董杰王慧玉尹德全李广艳
Owner LAIWU IRON & STEEL GRP