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Production process capable of effectively reducing cracks of antimony-containing weather-proof round steel

A production process and weather-resistant technology, which is applied in the field of metallurgy, can solve problems such as grain boundary segregation of antimony elements, adverse effects on steel surface quality, and low production efficiency, so as to achieve high production efficiency, reduce antimony-containing weather-resistant round steel cracks, and surface good quality effect

Active Publication Date: 2017-05-31
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the addition of antimony element is of great help to improve the sulfuric acid corrosion resistance of steel, scientific and technological workers add antimony to weathering steel, but the addition of antimony element is prone to grain boundary segregation, which has an adverse effect on the surface quality of steel. At present, the relevant manufacturers of antimony-containing weathering steel usually chamfer the continuous casting slab, and carry out multiple roll grinding on the rolled material before delivery, and the production efficiency is extremely low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Converter smelting

[0038] High-quality molten iron is used for converter smelting, among which, the mass content requirements of components in molten iron entering the furnace are: Si: 0.45%, P: 0.094%, S: 0.030%, and the temperature of molten iron entering the furnace is T = 1310°C;

[0039] Converter smelting controls tapping end point [C]=0.05%, end point [P]=0.012%, tapping temperature is 1635°C, the tapping process adopts sliding plate slag blocking operation, tapping time is 4.0 minutes, tapping 1 / 4 hour Deoxidizer, alloy and slag are added to molten steel in turn,

[0040] Among them, the added deoxidizer is 1kg / t each of calcium carbide and aluminum cake; the added alloys are 5.8kg / t silicon manganese, 2.5kg / t ferrosilicon, 15.8kg / t ferrochrome, 4.0kg / t copper, 0.62 antimony alloy kg / t, nickel plate 3.3kg / t; the added slag is lime 800kg / furnace (120 tons per furnace, the same below), synthetic slag 200kg / furnace;

[0041] (2) Refining process

[0042]Th...

Embodiment 2

[0051] In step (2), "this furnace is a pouring furnace, and the temperature of the hanging bag after soft blowing is controlled to be 1615-1630°C" is changed to "this furnace is a continuous pouring furnace, and the temperature of the hanging bag after soft blowing is controlled as 1600~1615 DEG C", the degree of superheat in step (3) is 40 DEG C and amends to 29 DEG C, all the other operations are identical with embodiment 1.

[0052] The chemical composition of the antimony-containing weathering round steel produced in this embodiment is calculated by mass percentage: C 0.09%, Si 0.35%, Mn 0.50%, Cr 0.91%, Cu 0.43%, Sb 0.06%, Ni 0.32%, sulfur The content is controlled to be 0.011%, the oxygen content is controlled to be 22ppm, the Ti content is controlled to be 0.038%, and the rest is Fe and trace elements.

[0053] Tracking of the obtained continuous casting slabs and rolled products: the surface quality of the continuous casting slabs and rolled products is good, no cracks...

Embodiment 3

[0055] Modify the pulling speed in step (3) to 1.82m / min, modify the heating rate in step (4) to 16.7°C / min, modify the tapping rhythm to 58 seconds, and the rest of the operations are the same as in Example 2.

[0056] Follow up the obtained continuous casting slabs and rolled materials: the surface quality of the continuous casting slabs and rolled materials is good, no cracks occur, and the pass rate of one-time flaw detection is 95.4%. it is good.

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a production process capable of effectively reducing cracks of antimony-containing weather-proof round steel. According to the production process, antimony precipitation and segregation are reduced by properly increasing the S content, decreasing the O content and controlling the Ti content; the oscillation mark depth is decreased by increasing the electromagnetic stirring current of a crystallizer, increasing the non-sinusoidal vibration frequency, decreasing the amplitude and shortening the negative strip time; Fe and Sb are prevented from being precipitated before straightening by increasing the casting blank straightening temperature; and the C solid content of casting powder is increased, the compression ratio is controlled through billet continuous casting, the heating speed is increased, and the tapping interval is shortened. The antimony-containing weather-proof round steel produced through the production process is good in surface quality and high in production efficiency, barreling treatment is not needed, and the one-time flaw detection percent of pass can reach 92% or above.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production process for effectively reducing cracks in antimony-containing weather-resistant round steel. Background technique [0002] Weathering steel, that is, atmospheric corrosion-resistant steel, is a low-alloy steel series between ordinary carbon steel and stainless steel. Weathering steel is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as chromium, nickel, and copper. Its surface is easy to form dense And a protective film with strong adhesion, which hinders the diffusion and development of rust, protects the substrate under the rust layer to slow down its corrosion rate, has good atmospheric corrosion resistance and fatigue resistance, and is mainly used in the manufacture of containers and railway vehicles Structural parts such as containers containing hydrogen sulfide corrosive media in oil derricks, oil product...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/60C22C33/04C21C7/06B22D11/115B22D11/22
CPCB22D11/115B22D11/225C21C7/0006C21C7/0068C21C7/06C22C33/04C22C38/02C22C38/04C22C38/42C22C38/60Y02P10/20
Inventor 豆乃远万文华
Owner ZENITH STEEL GROUP CORP
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