High manganese austenitic iron-based alloy containing boron

An iron-based alloy and austenitic technology, which is applied in the field of corrosion of boron-containing high-manganese austenitic iron-based alloys and its heat treatment, can solve the problems of increasing zinc consumption, reducing the operating rate of hot-dip galvanizing units, bending deformation of roll bodies, etc. question

Inactive Publication Date: 2011-04-27
北京北科德瑞冶金工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although 316L is an austenitic structure, its high-temperature strength and hardness at 450-480°C are insufficient, so the roll body is prone to bending deformation during use, which makes the galvanized sheet appear wavy, thereby reducing the quality and grade of the galvanized sheet. The corrosion resistance of 316L stainless steel sinking rolls is not high enough for liquid zinc corrosion, and the service life of a repair is 20-30 days. Frequent replacement and maintenance of sinking rolls and shaft sleeves not only reduces the operating rate of the hot-dip galvanizing unit, but also increases zinc consumption. thereby increasing the cost of the product

Method used

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  • High manganese austenitic iron-based alloy containing boron
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Examples

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Effect test

Embodiment 1

[0031] The alloy chemical composition listed in the table below is smelted and cast into a slab in a 10 kg vacuum induction furnace. Then cut and processed into impact, tensile and 15×10×5mm corrosion specimens. The corrosion test was carried out in the graphite crucible of the well-type resistance furnace. The liquid zinc is heated to 450°C, using a full immersion method. After a static corrosion test for seven consecutive days (168 hours), the average corrosion depth of the sample (ie, the average thickness loss of the sample) is measured.

[0032]

[0033] From the above table, it can be seen that the corrosion resistance of liquid zinc in alloy example 1 of the invention is 2.5 times that of 316L, and the corrosion resistance of liquid zinc in alloy example 2 of the invention is 3.5 times that of 316L cast alloy. The corrosion resistance to liquid zinc of Inventive Alloy Example 3 is 13.5 times that of 316L, and the corrosion resistance of Inventive Alloy Example 4 is 5.5 t...

Embodiment 2

[0036] The alloy chemical composition listed in the table below is smelted and cast into a slab in a 10 kg vacuum induction furnace. Then cut and processed into impact, tensile and 15×10×5mm corrosion specimens. The corrosion test was carried out in the graphite crucible of the well-type resistance furnace. The liquid zinc is heated to 450°C, using a full immersion method. After a static corrosion test for seven consecutive days (168 hours), the average corrosion depth of the sample (ie, the average thickness loss of the sample) is measured.

[0037]

[0038] It can be seen from the above table that the corrosion resistance of liquid zinc in the first alloy of the invention is 3 times that of 316L, and the corrosion resistance of liquid zinc in the second alloy of the invention is 3.8 times that of the 316L cast alloy. Inventive alloy example 3 has a liquid zinc corrosion resistance 10 times that of 316L, and invention alloy example 4 has a liquid zinc corrosion resistance 6 ti...

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Abstract

The invention relates to a high manganese austenitic iron-based alloy containing boron and a thermal processing method thereof. The alloy comprises the following chemical components of: 0.15-0.40% of C, 0.5-1.5% of Si, 8.0-14.0% of Mn, 15-22% of Cr, 1.5-3.5% of Ni, 0.3-0.55% of Nb, 0.4-0.5% of N+B and the balance being F2 and inevitable impurities. The normal temperature hardness of a cast alloy of the alloy melted by an electric furnace and shaped by centrifugally casting is up to 25-30 HRC; the room temperature extension strength is up to 700-720 MPa; the impact tenacity is up to more than 22 J / cm<2>; the corrosion resisting life is improved by 2.5-3 times more than a 316L stainless steel. Furthermore, the invention provides a thermal processing method for improving the corrosion resistance of the alloy, comprising the following steps of: completely solidly dissolving and separating secondary boride compounds in the issue via the high temperature solidly dissolving treatment and the annealing treatment so that the corrosion resisting life of the alloy is improved to more than 13 times than the 316 L stainless steel. The alloy has excellent liquid metal corrosion resistance and can be used for processing various key members for machining thermal dipping zincing production lines such as sinking rollers, shaft sleeves, bearing bushes, support arms and the like.

Description

Technical field [0001] The invention relates to the technical field of steel alloys, in particular to a boron-containing high-manganese austenitic iron-based alloy with corrosion resistance to liquid metal corrosion and a heat treatment method thereof. Background technique [0002] At present, hot-dip galvanizing technology for steel products is the most economical and effective method to prevent steel corrosion in the natural environment. After the workpiece is hot-dip galvanized, its corrosion resistance can be increased by 11-28 times. At the same time, due to the gap between the coating metal and the substrate Good bonding force, and can increase decoration and formability, so it is widely used in the processing and manufacturing process of plates, belts, wires, pipes, nets and hardware appliances. The specific method is to place the steel workpiece to be processed in 450 In the zinc pot at -480℃, take it out after staying for a period of time, but the liquid zinc has a stron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D1/18
Inventor 刘俊友张艺田光新邹敦叙许振华
Owner 北京北科德瑞冶金工程技术有限公司
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