US20090038959A1 - Highly Pure Stainless Steel Process - Google Patents

Highly Pure Stainless Steel Process Download PDF

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Publication number
US20090038959A1
US20090038959A1 US12/184,098 US18409808A US2009038959A1 US 20090038959 A1 US20090038959 A1 US 20090038959A1 US 18409808 A US18409808 A US 18409808A US 2009038959 A1 US2009038959 A1 US 2009038959A1
Authority
US
United States
Prior art keywords
stainless steel
cables
electropolishing
corrosion
product
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/184,098
Other languages
English (en)
Inventor
Wei Lin Chun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YUEN NENG CO Ltd
Original Assignee
YUEN NENG CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by YUEN NENG CO Ltd filed Critical YUEN NENG CO Ltd
Assigned to YUEN NENG CO., LTD. reassignment YUEN NENG CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHUN, WEI LIN
Publication of US20090038959A1 publication Critical patent/US20090038959A1/en
Abandoned legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C25F3/22—Polishing of heavy metals
    • C25F3/24—Polishing of heavy metals of iron or steel
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/12—Machine details; Auxiliary devices for softening, lubricating or impregnating ropes, cables, or component strands thereof
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2001—Wires or filaments
    • D07B2201/201—Wires or filaments characterised by a coating
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2083—Jackets or coverings
    • D07B2201/2087—Jackets or coverings being of the coated type
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3025—Steel
    • D07B2205/3028—Stainless steel
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/202—Environmental resistance
    • D07B2401/2025—Environmental resistance avoiding corrosion

Definitions

  • the invention relates to an electrochemical polishing process of stainless steel; and more particularly, it relates to a proper process control to produce highly pure stainless steel cable products with a brilliant appearance, an improved resistance to corrosion, and an enhanced life cycle.
  • a film of chromium oxide is often added to the surface of a film of chromium most stainless steel cables to protect them from corrosion quickly.
  • thickness of the film of chromium is directly related to the stainless steel product's resistance to corrosion.
  • Result of AES (Auger Electron Spectroscopy) analysis shows that most stainless steel cables are covered with only a thin layer of chromium oxide film, as reference 1 indicates; Still, addition of such a thin layer nevertheless adds manufacturing cost, as reference 2 shows.
  • a third disadvantage of adding a thin layer of chromium oxide film on the surface of the products is that scales may be produced as a result of compression with eye layer in high temperature during the threading process.
  • the main object of the invention is to improve the above-mentioned defects produced during the skim process of stainless steel threads or cables in traditional industry. Smoothing-enhanced surface process is added in this invention to stainless steel products to increase products' resistance to erosion and hence their life cycle.
  • the first object of the invention is to apply a series of processes to products of stainless steel threads or cables, including electrolysis skim, bath cleansing, electropolishing, acid activation, bath cleansing and drying, aiming to improve the surface smoothness and polishing, and hence their resistance to buildup, and contamination as well as corrosion resistance.
  • the second object of the invention is to apply a major ingredient, 30 g/l to 60 g/l of sodium hydroxide during electro skim process of stainless steel threads or cables.
  • the third object of the invention is to apply a major ingredient, 40% to 60% of phosphoric acid and 20% to 40% of sulfuric acid, during electropolishing process of stainless steel threads or cables.
  • the fourth object of the invention is to apply a major ingreident, 5% to 10% of nitric acid during weak acid activation process of stainless steel threads or cables.
  • SFP Stress Free Polishing
  • FIG. 1 is a flow chart illustrating the cleansing and polishing process in manufacturing stainless steel cables disclosed in this invention
  • FIG. 2 is an illustration of the electropolishing process disclosed in this invention to smooth out surface of stainless steel cables disclosed in this invention
  • Reference 1 is a chart showing ingredients amounts contained on AES surface of most stainless steel cables in traditional metal finishing prior arts
  • Reference 2 is an SEM figure showing scratches during threading process of most stainless steel cables in traditional metal finishing prior arts
  • Reference 3 is an SEM figure showing oxidized scales generated during threading process of most stainless steel cables in traditional metal finishing prior arts.
  • Reference 4 shows ingredients amounts contained on AES surface of stainless steel cables after electropolishing process disclosed in this invention.
  • this invention discloses the structure of a highly pure stainless steel cables and its manufacturing process.
  • step-by-step procedures are listed in order below:
  • step (3) process of electropolishing of stainless steel cables made of stainless steel threads with twisting process stainless steel cables are immersed in an electrolyte composed mainly of phosphate (to be more specific, the electrolyte consists of 40% to 60% of phosphoric acid and 20% to 40% of sulfuric acid), and subjected to a direct electrical current. With the movement of both positive and negative ions caused by the electrical reaction, particles of metal are removed.
  • an electrolyte composed mainly of phosphate (to be more specific, the electrolyte consists of 40% to 60% of phosphoric acid and 20% to 40% of sulfuric acid), and subjected to a direct electrical current.
  • the outer layer of the stainless steel cables after our polishing process contains more in chromium and oxygen.
  • the oxygen amount contained in the most outer layer is 40%, which decreases from outer to inner layer, and is maintained at 10% at the inner layer, indicating more chromium and oxygen are contained in the stainless steel cables after our polishing process (please also refer to Reference 4 , which shows ingredients amounts contained on AES surface of stainless steel cables applied with our electropolishing).
  • the thickness of the oxidized layer of with the stainless steel cables with our electropolishing is estimated to be at least 5 times that of the oxidized layer without our electropolishing, based on the amount of oxygen contained in the layer.
  • the main ingredient used in step (4) activation process with weak acid is 5% to 10% of Nitric acid.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Metal Extraction Processes (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
US12/184,098 2007-08-10 2008-07-31 Highly Pure Stainless Steel Process Abandoned US20090038959A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW96129486 2007-08-10
TW096129486A TW200907117A (en) 2007-08-10 2007-08-10 Structure of high clean stainless steel cord and processing method thereof

Publications (1)

Publication Number Publication Date
US20090038959A1 true US20090038959A1 (en) 2009-02-12

Family

ID=40345451

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/184,098 Abandoned US20090038959A1 (en) 2007-08-10 2008-07-31 Highly Pure Stainless Steel Process

Country Status (2)

Country Link
US (1) US20090038959A1 (es)
TW (1) TW200907117A (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105350364A (zh) * 2015-12-07 2016-02-24 华勤钢丝绳有限公司 一种输送带用超高强度钢丝绳及其拉丝方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4776897A (en) * 1984-08-29 1988-10-11 Shinko-Pfaudler Company, Ltd. Method for treating the surface of stainless steel by high temperature oxidation
US5049221A (en) * 1986-02-21 1991-09-17 Meiko Electronics Co., Ltd. Process for producing a copper-clad laminate
US20050145508A1 (en) * 2003-12-30 2005-07-07 Scimed Life Systems, Inc. Method for cleaning and polishing steel-plantinum alloys
US20070173411A1 (en) * 2006-01-26 2007-07-26 Ls Cable Ltd. Method of manufacturing substrate for superconducting cable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4776897A (en) * 1984-08-29 1988-10-11 Shinko-Pfaudler Company, Ltd. Method for treating the surface of stainless steel by high temperature oxidation
US5049221A (en) * 1986-02-21 1991-09-17 Meiko Electronics Co., Ltd. Process for producing a copper-clad laminate
US20050145508A1 (en) * 2003-12-30 2005-07-07 Scimed Life Systems, Inc. Method for cleaning and polishing steel-plantinum alloys
US20070173411A1 (en) * 2006-01-26 2007-07-26 Ls Cable Ltd. Method of manufacturing substrate for superconducting cable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105350364A (zh) * 2015-12-07 2016-02-24 华勤钢丝绳有限公司 一种输送带用超高强度钢丝绳及其拉丝方法

Also Published As

Publication number Publication date
TWI351451B (es) 2011-11-01
TW200907117A (en) 2009-02-16

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Date Code Title Description
AS Assignment

Owner name: YUEN NENG CO., LTD., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHUN, WEI LIN;REEL/FRAME:021325/0880

Effective date: 20080720

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION