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Steel for D-type anchor chain end shackle

An end shackle and anchor chain technology, which is applied in the field of alloy steel and D-type anchor chain end shackle steel, can solve the problem of not mentioning the mechanical properties of large-size steel, and cannot meet the performance requirements of large-size D-type end shackles. The mechanical properties cannot meet the problems such as anchor chain shackle, etc., to achieve the effect of increasing the labor intensity of workers, using large specifications and suitable margins

Pending Publication Date: 2020-05-19
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel type in this patent is mainly used in the crane industry. The invention patent is only for Ф30mm steel, and does not mention the mechanical properties of large-scale steel. At the same time, the mechanical properties of this steel cannot meet the requirements of anchor chain shackles (tensile strength ≥690Mpa, yield strength ≥410Mpa, elongation ≥17% and reduction of area ≥40%, 0°C V-type impact energy ≥60J)
In view of the fact that there are no special steel standards and patents for D-type end shackles at home and abroad, and the existing D-type ends are all forged with anchor chain steel, for small-sized D-type end shackles, this anchor chain The performance of the steel can be satisfied, but the large-scale D-type end shackle requires higher welding performance and mechanical properties. The above-mentioned anchor chain steel cannot meet the performance requirements of the large-scale D-type end shackle. Therefore, a special, stronger , D-type end shackle steel with better toughness has become an urgent practical demand

Method used

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  • Steel for D-type anchor chain end shackle
  • Steel for D-type anchor chain end shackle
  • Steel for D-type anchor chain end shackle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Raw materials are configured by the chemical elements of the following mass percentages:

[0036] C0.32%, Si0.28%, Mn1.76%, Cr0.52%, Mo0.064%, Al0.023%, P0.012%, S0.004%, Ti0.015%, O0.0013%, H0.00016%, N0.0041%, and the balance is Fe.

[0037] Prepare the steel for D-type anchor chain end shackles according to the following process:

[0038] After smelting in ordinary converter or electric furnace, refining treatment is carried out in LF refining furnace and vacuum furnace. After LF refining, conventional calcium denaturation treatment is carried out, and it is cast into square billet or large round billet on arc continuous casting machine. Rolled into the corresponding specifications in the rolling mill;

[0039] specific:

[0040] (1) Smelting: Smelting in a converter or electric furnace of more than 50 tons, adding molten iron and scrap steel to realize dephosphorization and alloying of molten steel;

[0041] (2) Refining outside the furnace (LF furnace refining ...

Embodiment 2

[0051] Raw materials are configured by the chemical elements of the following mass percentages:

[0052] C0.30%, Si0.23%, Mn1.72%, Cr0.46%, Mo0.052%, Al0.025%, P0.009%, S0.003%, Ti0.013%, O0.0011%, H0.00008%, N0.0032%, and the balance is Fe.

[0053] The preparation process is the same as in Example 1.

[0054] In this embodiment, the specifications of the prepared steel are: casting section: 200mm*200mm, and rolled steel specification: Ф80mm.

[0055] The whole raw material is quenched and tempered, the quenching and tempering temperature is 900°C quenching + 600°C tempering, the sampling position see image 3 , the obtained mechanical properties are shown in Table 3.

[0056] Table 3 Mechanical properties of raw materials

[0057]

Embodiment 3

[0059] Raw materials are configured by the chemical elements of the following mass percentages:

[0060] C0.31%, Si0.26%, Mn1.74%, Cr0.48%, Mo0.054%, Al0.026%, P0.0010%, S0.004%, Ti0.016%, O0.0013%, H0.00013%, N0.0045%, and the balance is Fe.

[0061] The preparation process is the same as in Example 1.

[0062] In this embodiment, the specifications of the produced steel are: casting section: 150mm*150mm, and rolled steel specification: Ф35mm.

[0063] The whole raw material is quenched and tempered, the quenching and tempering temperature is 910°C quenching + 610°C tempering, the sampling position see Figure 4 , the obtained mechanical properties are shown in Table 4.

[0064] Table 4 Mechanical properties of raw materials

[0065]

[0066] The steel produced in Example 1 is hot-forged into a D-type anchor chain end shackle with a specification of Φ180mm, and the shackle has been subjected to overall quenching and tempering treatment (quenching temperature 890°C + te...

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Abstract

The invention discloses steel for a D-type anchor chain end shackle. The steel is composed of the following elements in percentage by mass of 0.30%-0.34% of C, 0.20%-0.35% of Si, 1.70%-1.80% of Mn, 0.45%-0.55% of Cr, 0.050%-0.065% of Mo, 0.020%-0.035% of Al, 0%-0.015% of P, 0%-0.008% of S, 0.010%-0.020% of Ti, 0%-0.0020% of O, 0%-0.0002% of H, 0%-0.0070% of N and the balance Fe. The steel for theD-type anchor chain end shackle has higher strength, toughness and corrosion resistance, the application range is wider, the steel is suitable for a D-type end shackle of a common specification, and can also meet a large-specification D-type anchor chain end shackle. The steel is high in adaptability to the process, can be produced in the process flow (converter or electric furnace + furnace external refining + continuous casting + rolling) of a conventional steel enterprise, the production process is simple, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of steel preparation, and relates to alloy steel, in particular to a steel for shackle at the end of a D-type anchor chain. Background technique [0002] Anchor chain shackles are marine anchor chains or mooring structural parts on offshore platforms. According to the shape of the shackles, they can be divided into D-type, O-type, Q-type, etc., and the D-type end shackles are widely used in marine structures. . D-type anchor chain end shackles are mainly used to connect anchor shackles and anchor chains, and can also connect cables and chains to overtime eyelets and other devices. D-type anchor chain end shackles are the same as anchor chains to ensure that ships and ocean engineering A life button that can exist safely in harsh environments. With the enlargement of ships, the enlargement and deep sea of ​​marine engineering, and the influence of complex marine environment and unexpected factors, the speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/22C22C38/02C22C38/06C22C38/28
CPCC22C38/02C22C38/06C22C38/22C22C38/28C22C38/38
Inventor 梁佰战郑力宁肖波石可伟王子健唐宁刘影雷鸣赵刚王冠洋
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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