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Manufacture method of novel marine corrosion resistance stainless steel and steel cable thereof

A technology of stainless steel and seawater resistance, which is applied in the manufacture of stainless steel and its steel wire rope, and the manufacture of seawater corrosion-resistant stainless steel and its steel wire rope. It can solve the problems of shortened service life, short life, and not strict control of inclusions such as MnS

Inactive Publication Date: 2010-07-14
江苏亚盛金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to statistics, the steel wire rope made of galvanized carbon steel has a short service life in seawater.
[0004] Generally used for less than one year, it cannot be used due to corrosion and fracture
At the same time, because the control of inclusions such as MnS in the stainless steel production process in my country is not strict, even if 304 or 316 stainless steel wire ropes are used, they are easily corroded and damaged in seawater tidal zones, shortening the service life

Method used

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  • Manufacture method of novel marine corrosion resistance stainless steel and steel cable thereof
  • Manufacture method of novel marine corrosion resistance stainless steel and steel cable thereof
  • Manufacture method of novel marine corrosion resistance stainless steel and steel cable thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 00Cr23Ni14Mo4Cu3NbNRE stainless steel smelting and rolling manufacturing process

[0048] Charge (scrap steel)——EAF (electric furnace)——VOD (refining furnace)——continuous casting of 180mm billet——skinning—flaw detection—heating—hot continuous rolling (rough, medium, and finish rolling) ф5.5- 16mm wire—coiling—heat treatment (solution)—pickling—inspection—packaging and storage.

Embodiment 2

[0050] 00Cr23Ni14Mo4Cu3NbNRE stainless steel wire rope manufacturing process

[0051] ф5.5mm wire—film treatment—drying—rough drawing (6-7 passes) ф2.5mm—cleaning surface—drying—solution heat treatment—medium drawing (9-11 passes) ф1.2mm——Bright annealing——Water tank drawing (19 molds) ф0.6mm——Electrolytic polishing——Twisting strands (1×7)——Combined rope (6×7) Rope diameter 5.8mm——Take-up— Inspection - packing - storage.

[0052] Above-mentioned embodiment 1 and 2 conventional process manufacturing technical means, do not describe in detail here, the key manufacturing technology involved in the present invention is as follows:

[0053] 1) The SS-VOD method is used for refining outside the furnace, that is, blowing argon or nitrogen with more than 2 air-permeable bricks or 3-6 (ф2-4mm) stainless steel heat-resistant steel pipes to strongly stir the molten steel and increase the N alloy It can produce ultra-low carbon (C<0.03%) and ultra-low sulfur (S<0.01%) stainless steel. ...

Embodiment 3

[0060] After the water tank is drawn, the steel wire is electrolytically polished, and then twisted and closed, which is the most important technological innovation point of the present invention. The surface of electropolished stainless steel wire and steel rope has the best corrosion resistance. The reason is that electropolishing can remove dirt and impurities, chromium-poor layer and non-metallic inclusions on the surface of stainless steel, and reduce the surface roughness of steel wire by 50%. The surface of the steel wire is not only bright, smooth and clean, but also has high passivation state stability, so it has high corrosion resistance. This can also be seen from the test results. The following are the comparison results of different surface treatments of 0Cr17Ni12Mo2 (316) for corrosion resistance in natural seawater. (at room temperature)

[0061] code name

surface treatment

Corrosion area (%)

Maximum corrosion depth (mm)

A

cold...

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PUM

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Abstract

The invention provides a manufacture method of novel marine corrosion resistance stainless steel and a steel cable thereof. The marine corrosion resistance stainless steel comprises chemical compositions in the respective mixture ratio: less than 0.03 of C, less than 0.80 of Si, less than 0.50 of Mn, less than 0.03 of P, less than 0.01 of S, 22.0 to 25.0 of Cr, 13.0 to 15.0 of Ni, 3.0 to 5.0 of Mo, 2.0 to 4.0 of Cu, 0.10 to 0.20 of Nb, 0.30 to 0.45 of N, 0.03 to 0.06 of RE and the balance of Fe and unavoidable impurities. Steel wires required by the steel cable carry out electrolytic polishing processing before stranding. Compared with 316 stainless steel cables under the conditions of the same structure and the same cable diameter, the steel cable manufactured by the method of the invention has the advantages that the breaking force of the whole cable is improved by 3 to 4 KN, at the same time, the marine corrosion resistance annual corrosion speed rate in the environment such as marine atmosphere, splash zones, tidal zones, deep sea and the like is improved by more than ten times, and the maximum annual corrosion resistance depth is reduced by more than 5 times.

Description

technical field [0001] The invention relates to a manufacturing method of stainless steel and its steel wire rope, in particular to a manufacturing method of seawater corrosion-resistant stainless steel and its steel wire rope. It belongs to the technical field of metal products. Background technique [0002] With the rapid development of my country's ocean engineering, ocean-going ships, mariculture, and sea salvage industries, about 150,000 tons of various steel wire ropes are consumed each year. This type of steel wire rope is mainly produced with galvanized carbon steel. In recent years, 304 (0Cr18Ni9) or 304 (0Cr18Ni9) or 316 (0Cr17Ni12Mo2) and other grades of stainless steel production. [0003] According to statistics, the steel wire rope made of galvanized carbon steel has a short service life in seawater. [0004] Generally, after less than one year of use, it cannot be used due to corrosion and fracture. At the same time, because the control of inclusions such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C21C7/072C21C7/068C21C7/06
Inventor 蒋东华蒋红俊周江肖爱桦
Owner 江苏亚盛金属制品有限公司
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