WO1994023084A1 - Bainite rod wire or steel wire for wire drawing and process for producing the same - Google Patents
Bainite rod wire or steel wire for wire drawing and process for producing the same Download PDFInfo
- Publication number
- WO1994023084A1 WO1994023084A1 PCT/JP1994/000577 JP9400577W WO9423084A1 WO 1994023084 A1 WO1994023084 A1 WO 1994023084A1 JP 9400577 W JP9400577 W JP 9400577W WO 9423084 A1 WO9423084 A1 WO 9423084A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wire
- less
- bainite
- steel
- temperature
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
Definitions
- the present invention relates to a bainite wire or a steel wire for wire drawing and a method for producing the same.
- a wire rod as a product means a wire rod which is subjected to direct heat treatment after rolling a slab into a wire rod and used for wire drawing, and a steel wire as a product is before or after hot rolling.
- wire or steel wire is drawn according to the use of various end products, but it is necessary to make the wire or steel wire suitable for wire drawing before this wire drawing. is there.
- An object of the present invention is to provide a veneite wire or a steel wire excellent in drawability that does not cause the above-mentioned problems in the wire drawing process, and a method for producing the same. Disclosure of the invention
- the object of the present invention is to provide, according to the present invention, a chemical composition comprising a specific amount of C, Mn, Si and optionally Cr, wherein the upper limit of the amount of P and S is limited.
- the problem is solved by providing a wire or steel wire of payinite tissue having an improved tensile strength and draw value.
- Another object of the present invention is to increase the cooling speed to the nose position in the TTT diagram in cooling the wire after hot rolling or in heat treatment of the steel wire after heating to the austenitizing temperature, thereby increasing the pearlite structure.
- An object of the present invention is to provide a bainite wire or a steel wire obtained by preventing the formation and then isothermally maintaining the temperature at 350 to 500 ° C. In other words, after the wire rod is rolled or after the steel wire is heated, the temperature range is from 110 to 75 ° C, and the cooling rate is 60 to 300 ° C.
- the gist of the present invention is as follows.
- a 1 0.003% or less
- a bainite wire or a steel wire for wire drawing having a tensile strength and a drawing value defined by (1) and (2).
- a 1 0.003% or less
- a 1 0.003% or less
- a method for producing a bainite steel wire for wire drawing characterized in that the bainite steel wire is cooled to a temperature range and held for at least Y seconds in the temperature range defined by the following formula (3).
- FIG. 1 is a view showing a heat treatment pattern of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- C is a basic element that controls the strength and ductility of steel. The higher the carbon content, the higher the strength. The lower limit of the C content was 0.90 wt% to ensure hardenability and strength, and the upper limit was 1.10 wt% to prevent the occurrence of proeutectoid cementite.
- Si is added as a deoxidizer.
- Si is an element that strengthens the solid solution of the steel and is an element that can reduce the relaxation loss of the steel wire.
- the addition amount is increased, the scale generation amount is reduced, the mechanical descaling property is deteriorated, and the bond lubricity of the wire rod is slightly reduced. Therefore, the upper limit of 81 is set to 0.40 wt%.
- Mn is added as a deoxidizer.
- Mn is an element that strengthens the solid solution of steel, but segregation tends to occur in the center of the wire rod when the addition amount is increased.
- the segregated part improves the hardenability and the transformation end time shifts to a longer time, so the untransformed part becomes martensite, which leads to disconnection during wire drawing. Therefore, the upper limit of the amount was set to 0.50 wt%.
- Cr is an element that is added as needed to increase the strength of the steel.
- the strength increases as the amount of addition increases, but the hardenability also increases, The transformation end line moves to the long side. For this reason, the time required for the heat treatment becomes longer, so the upper limit of Cr was set to 0.30 wt%, and the lower limit was set to 0.10 wt% to increase the strength.
- the content of A 1 is set to 0.003 wt% or less in order to avoid a decrease in ductility due to non-ductile inclusions.
- the cooling start temperature after wire rod rolling or the steel wire heating temperature was limited to 755-1100 ° C, because 755 ° C is the lower limit temperature of the austenite transformation point. This is because abnormal growth of grains occurs.
- the cooling rate to the constant temperature range of 350-500 ° C was limited to 60-300 ° C / sec. This is because the lower limit of the cooling rate is 300 ° C / sec, which is the upper limit of the industrially possible cooling rate.
- the reason for setting the constant temperature after cooling to 350 to 500 ° C is that 350 ° C is the lower limit temperature for upper bainite structure formation, while 500 ° C is the upper limit temperature for upper bainite structure formation. It is.
- the time required to maintain a constant temperature in the temperature range of 300 to 500 ° C can be obtained from the transformation end line of the TTT diagram. If the immersion time in the cooling bath is insufficient, martensite is generated and the wire is drawn. It may cause disconnection during processing. So strange Therefore, the lower limit of the time for maintaining the temperature in the temperature range of 350 to 500 ° C was set to the time Y seconds defined by the following equation (3).
- the tensile strength strongly depends on the C content, it is given in relation to the C content as shown in equation (1).
- a wire or steel wire having a payinite structure has a lower cementitious precipitation than a conventional wire or steel wire having a pearlite structure, and therefore has a lower tensile strength at the same composition.
- the tensile strength is limited as shown in equation (1). If the upper limit is exceeded, the wire drawing processability will be degraded, leading to disconnection during the wire drawing process and delamination.
- the drawing value is an important factor that indicates the sharpness of the processing during wire drawing. Even with the same tensile strength, the higher the drawing value L, the lower the work hardening rate during wire drawing, and the wire drawing can be performed to a high area reduction rate.
- the wire with a payinite structure has a coarser cementite precipitate than the conventional wire with a pearlite structure, and therefore has a higher drawing value even at the same tensile strength. Therefore, the aperture value was limited as shown in Eq. (2) as a limit that does not degrade the drawing limit. If the lower limit is not reached, the wire drawing processability will be degraded, leading to wire breakage during the wire drawing process and delamination.
- the wire or steel wire having a payinite structure of the present invention has a tensile strength and a drawing value defined as described above, an upper bainite structure having an area ratio of 80% or more, and Hv By having a microstructure of 450 or less, the drawability is further improved.
- Table 1 shows the chemical composition of the test steel.
- a to D are examples of the steel of the present invention, and E and F are examples of comparative steels.
- steel E the amount of C exceeds the upper limit
- steel F the amount of Mn exceeds the upper limit.
- test steels were cut into 300 X 500 mm pieces by a continuous manufacturing facility, and further subjected to slab rolling to produce steel pieces having a 122 mm square cross section.
- the tensile test was performed using the No. 2 test piece of JIS SZ 2201 according to the method described in JIS S2241.
- the test piece was cut to a length of 100 d + 100 and then rotated at a distance between chucks of 100 d and a rotation speed of 10 rpm until breaking.
- d represents the diameter of the steel wire.
- Table 2 shows the characteristic values thus obtained.
- No. 5 to No. 10 are comparative examples.
- Cooling start temperature T Holding temperature after cooling
- Cooling speed t Holding time after cooling
- Table 3 shows the chemical composition of the test steel wire.
- Steel E has a C content exceeding the upper limit
- steel F has a Mn content exceeding the upper limit.
- the tensile test was performed by the method described in JISZ2241 using a No. 2 test piece of JISZ2201.
- No. 1 to No. 4 are examples of the present invention, and all the heat treatment conditions of the present invention are satisfied. Therefore, even after 1.0 mm0 after drawing, delamination can be performed without drawing.
- Nos. 5 to 10 are comparative examples.
- Heating temperature T Holding temperature after cooling
- Cooling speed t Holding time after cooling
- the wire or the steel wire manufactured according to the present invention can be drawn to a much higher area reduction ratio than the conventional method, and the delamination resistance characteristics are also improved. Therefore, according to the present invention, it is possible to provide a bainite wire or a steel wire having excellent drawability.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69424865T DE69424865T2 (de) | 1993-04-06 | 1994-04-06 | Bainitstange oder stahldraht zum drahtziehen und verfahren zu deren herstellung |
US08/530,122 US5662747A (en) | 1993-04-06 | 1994-04-06 | Bainite wire rod and wire for drawing and methods of producing the same |
EP94912063A EP0693570B1 (en) | 1993-04-06 | 1994-04-06 | Bainite rod wire or steel wire for wire drawing and process for producing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5079901A JP2984887B2 (ja) | 1992-04-09 | 1993-04-06 | 伸線加工用ベイナイト線材または鋼線およびその製造方法 |
JP5/79901 | 1993-04-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994023084A1 true WO1994023084A1 (en) | 1994-10-13 |
Family
ID=13703191
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/000577 WO1994023084A1 (en) | 1993-04-06 | 1994-04-06 | Bainite rod wire or steel wire for wire drawing and process for producing the same |
Country Status (4)
Country | Link |
---|---|
US (1) | US5662747A (ja) |
EP (1) | EP0693570B1 (ja) |
DE (1) | DE69424865T2 (ja) |
WO (1) | WO1994023084A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6099797A (en) * | 1996-09-04 | 2000-08-08 | The Goodyear Tire & Rubber Company | Steel tire cord with high tensile strength |
BR9704532A (pt) * | 1996-09-04 | 1998-12-01 | Goodyear Tire & Rubber | Cordonel de aço de pneu com alto limited de resistência à tração |
JP4248790B2 (ja) * | 2002-02-06 | 2009-04-02 | 株式会社神戸製鋼所 | メカニカルデスケーリング性に優れた鋼線材およびその製造方法 |
US20040025987A1 (en) * | 2002-05-31 | 2004-02-12 | Bhagwat Anand W. | High carbon steel wire with bainitic structure for spring and other cold-formed applications |
US8532585B2 (en) * | 2010-05-11 | 2013-09-10 | Harris Corporation | Electronic device with rotary knob multi-functional control |
TWI516611B (zh) * | 2013-10-08 | 2016-01-11 | 新日鐵住金股份有限公司 | 線材、過共析變韌鐵鋼線、及該等之製造方法 |
US11118251B2 (en) | 2017-06-15 | 2021-09-14 | Nippon Steel Corporation | Rolled wire rod for spring steel |
CN108950398A (zh) * | 2018-08-08 | 2018-12-07 | 鞍钢股份有限公司 | 一种帘线钢盘条及其脱碳层控制方法 |
CN109023075A (zh) * | 2018-09-05 | 2018-12-18 | 鞍钢股份有限公司 | 一种1860MPa级高强镀锌钢丝绳用盘条的生产方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60245722A (ja) * | 1984-05-21 | 1985-12-05 | Kawasaki Steel Corp | 高張力線材の製造方法 |
JPS6324045A (ja) * | 1986-07-16 | 1988-02-01 | Nippon Kokan Kk <Nkk> | 不安定破壊伝播停止能力に優れた耐摩耗性高性能レ−ル |
JPS6324046A (ja) * | 1986-07-16 | 1988-02-01 | Kobe Steel Ltd | 高靭性高延性極細線用線材 |
JPS6439353A (en) * | 1987-08-03 | 1989-02-09 | Kobe Steel Ltd | High-strength spring steel |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5921370B2 (ja) * | 1976-11-02 | 1984-05-19 | 新日本製鐵株式会社 | 耐応力腐食割れ性が優れた高延性高張力線材の製造法 |
-
1994
- 1994-04-06 WO PCT/JP1994/000577 patent/WO1994023084A1/ja active IP Right Grant
- 1994-04-06 US US08/530,122 patent/US5662747A/en not_active Expired - Lifetime
- 1994-04-06 EP EP94912063A patent/EP0693570B1/en not_active Expired - Lifetime
- 1994-04-06 DE DE69424865T patent/DE69424865T2/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60245722A (ja) * | 1984-05-21 | 1985-12-05 | Kawasaki Steel Corp | 高張力線材の製造方法 |
JPS6324045A (ja) * | 1986-07-16 | 1988-02-01 | Nippon Kokan Kk <Nkk> | 不安定破壊伝播停止能力に優れた耐摩耗性高性能レ−ル |
JPS6324046A (ja) * | 1986-07-16 | 1988-02-01 | Kobe Steel Ltd | 高靭性高延性極細線用線材 |
JPS6439353A (en) * | 1987-08-03 | 1989-02-09 | Kobe Steel Ltd | High-strength spring steel |
Non-Patent Citations (1)
Title |
---|
See also references of EP0693570A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP0693570A4 (en) | 1996-03-20 |
DE69424865D1 (de) | 2000-07-13 |
EP0693570B1 (en) | 2000-06-07 |
EP0693570A1 (en) | 1996-01-24 |
DE69424865T2 (de) | 2000-10-19 |
US5662747A (en) | 1997-09-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO1994023084A1 (en) | Bainite rod wire or steel wire for wire drawing and process for producing the same | |
JPH08337843A (ja) | 打抜き加工性に優れた高炭素熱延鋼板及びその製造方法 | |
JP3388418B2 (ja) | 伸線加工性に優れた高炭素鋼線材または鋼線の製造方法 | |
EP0693571B1 (en) | Bainite rod wire or steel wire for wire drawing and process for producing the same | |
JP2984889B2 (ja) | 伸線加工性に優れた高炭素鋼線材または鋼線およびその製造方法 | |
EP0707088B1 (en) | High-carbon steel rod wire or steel wire excellent in workability in wire drawing and process for producing the same | |
JP2004011002A (ja) | 伸線加工用の素線及び線 | |
JP2003105499A (ja) | 靭性および延性に優れたパーライト系レールおよびその製造方法 | |
JP2984887B2 (ja) | 伸線加工用ベイナイト線材または鋼線およびその製造方法 | |
EP0707089B1 (en) | High-carbon steel wire or steel therefor excellent in workability in wire drawing and process for producing the same | |
EP0708183B1 (en) | High-carbon steel rod wire or steel wire excellent in workability in wire drawing and process for producing the same | |
EP0693569B1 (en) | Bainite rod wire or steel wire for wire drawing and process for producing the same | |
JP2984885B2 (ja) | 伸線加工用ベイナイト線材または鋼線およびその製造方法 | |
JP2984888B2 (ja) | 伸線加工性に優れた高炭素鋼線材または鋼線およびその製造方法 | |
JPH08337817A (ja) | 耐水素遅れ割れ特性に優れた超高張力電縫鋼管の製造方法 | |
JP2984886B2 (ja) | 伸線加工用ベイナイト線材または鋼線およびその製造方法 | |
JPH083649A (ja) | 伸線加工性に優れた高炭素鋼線材または鋼線の製造方法 | |
JP2742967B2 (ja) | ベイナイト線材の製造法 | |
JPH07268464A (ja) | 伸線加工用ベイナイト線材または鋼線の製造方法 | |
JPH0813030A (ja) | メタルソー基板用鋼板の製造方法 | |
JPH10265845A (ja) | 冷間加工性に優れた熱延合金鋼板の製造方法 | |
JPH07310142A (ja) | 低品位スクラップ高配合型軟質冷延鋼板およびその製造方法 | |
JPH05239588A (ja) | 成形性と溶接性に優れた中炭素熱延鋼板とその製造方法 | |
JP3443220B2 (ja) | 深絞り性の優れた熱延鋼板及びその製造方法 | |
JPH06248340A (ja) | 加工性に優れた熱延鋼板の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 08530122 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1994912063 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 1994912063 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1994912063 Country of ref document: EP |