CN107794443A - A kind of production method of high-performing car exhaust tube steel - Google Patents
A kind of production method of high-performing car exhaust tube steel Download PDFInfo
- Publication number
- CN107794443A CN107794443A CN201710968644.3A CN201710968644A CN107794443A CN 107794443 A CN107794443 A CN 107794443A CN 201710968644 A CN201710968644 A CN 201710968644A CN 107794443 A CN107794443 A CN 107794443A
- Authority
- CN
- China
- Prior art keywords
- pickling
- straightening
- strip
- annealing
- line annealing
- 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.)
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A kind of production method of high-performing car exhaust tube steel, cold line annealing and pickling straightening packaging process flow is rolled including hot line annealing and pickling, it is characterized in that in the hot line annealing and pickling strip in annealing furnace heat time control in every mm of thickness 30 35 seconds, 910 950 DEG C of annealed sheet；It is different according to mill product thickness, selection rolling total deformation rate；In the cold line annealing and pickling strip in annealing furnace heat time control in every mm of thickness 55 70 seconds, 890 915 DEG C of annealed sheet temperature；Strip straightening tension force is at 30 35 tons in straightening.The present invention improves the elongation after fracture of SUH409L stainless steels, tensile strength, and bend pipe, expander problem of Cracking occurs so as to avoid.
Description
Technical field
The invention belongs to metallurgy, stainless steel production field, the high-performing car exhaust tube steel is SUH409L stainless steels.
Technical background
SUH409L stainless steels are comprehensive with its enough toughness, good processing forming, corrosion resistance and elevated temperature strength etc.
Can, it is mainly used in the fields such as automobile exhaust system, heat exchanger.Due to when manufacturing automobile exhaust system, it is necessary to expander, curved
Pipe, it is therefore necessary to which there is higher elongation after fracture, tensile strength and grain size requirement.SUH409L cold drawing days mark JIS G
4312-2011 requires elongation after fracture A50 >=22%, tensile strength Rm >=360N/mm2, and automobile exhaust system is done, have no progeny
Elongation A50 need to be up to more than 35%, and tensile strength Rm need to reach 390N/mm2More than, grain size control is in 6-8 levels, otherwise, easily generation
Expander, bend pipe problem of Cracking.
The content of the invention
In order to improve the elongation after fracture of SUH409L stainless steels, tensile strength, the present invention provides a kind of high-performing car row
The annealing and pickling method of gas tube steel.
Present invention process flow:Hot line annealing and pickling-rolling-cold line annealing and pickling-straightening-packaging.Hot line annealing and pickling
Strip heat time in annealing furnace is controlled in every mm of thickness 30-35 seconds, 910-950 DEG C of annealed sheet temperature；
1st, roll
Mill product thickness is 0.3 mm -0.6 mm, rolls total deformation rate >=80%；
Finished product thickness is 0.7 mm -1.0 mm, rolls total deformation rate >=75%；
Finished product thickness is 1.1 mm -2.0 mm, rolls total deformation rate >=70%；
Finished product thickness is 2.0 more than mm, rolls total deformation rate >=60%.
2nd, cold line annealing and pickling
Strip heat time in annealing furnace is controlled in every mm of thickness 55-70 seconds, 890-915 DEG C of annealed sheet temperature；
3rd, straightening
Strip straightening tension force is in 30-35 tons.
The present invention improves the elongation after fracture of SUH409L stainless steels, tensile strength, and elongation after fracture reaches more than 35%,
Tensile strength reaches 390N/mm2More than, bend pipe, expander problem of Cracking occurs so as to avoid.
Embodiment
1st, embodiment one：
Steel grade：SUH409L, raw material are thick：3.0mm, width 1250mm, finished product thickness 0.6mm；
Its chemical analysis mass percent is as follows：C≤0.03, Si≤1.0, Mn≤1.0, P≤0.04, S≤0.03, Cr are
10.5-11.7, Ni≤0.6, N≤0.03, Ti 6*（C+N）- 0.75, remaining is iron and inevitable impurity.
(1) hot line annealing and pickling
Strip heat time in annealing furnace:98 seconds
Annealed sheet temperature:935℃
(2) roll:Raw thickness is 3.0 mm, and finished product thickness is 0.6 mm, and rolling total deformation rate is 80%；
(3) cold line annealing and pickling
Strip heat time in annealing furnace:36 seconds
Annealed sheet temperature:895℃
(4) straightening
Finished strip straightening tension force is at 35 tons.
Finished strip performance：Elongation after fracture A50=37%, tensile strength Rm=405N/mm2, 7 grades of grain size.
Embodiment two：Steel grade：SUH409L, raw material are thick：4.0mm, width 1250mm, finished product thickness 1.2mm；
（1）Hot line annealing and pickling：Strip heat time in annealing furnace:125 seconds, annealed sheet temperature:930℃；
（2）Rolling:Raw thickness is 4.0 mm, and finished product thickness is 1.2mm, and rolling total deformation rate is 70%；
（3）Cold line annealing and pickling：Strip heat time in annealing furnace:75 seconds, annealed sheet temperature:898℃；
（4）Straightening：Finished strip straightening tension force is at 32 tons.
Finished strip performance：Elongation after fracture A50=36%, tensile strength Rm=412N/mm2, 6 grades of grain size.
Claims (1)
1. a kind of production method of high-performing car exhaust tube steel, including hot line annealing and pickling-rolling-cold line annealing and pickling-
Straightening-packaging process flow, it is characterized in that strip heat time in annealing furnace is controlled in every milli in the hot line annealing and pickling
Meter Hou Du 30-35 seconds, 910-950 DEG C of annealed sheet；Mill product thickness is 0.3 mm -0.6 mm, rolls total deformation rate >=80%；
Finished product thickness is 0.7 mm -1.0 mm, rolls total deformation rate >=75%；Finished product thickness is 1.1 mm -2.0 mm, rolls total become
Form quotient >=70%；Finished product thickness is 2.0 more than mm, rolls total deformation rate >=60%；Strip is being annealed in the cold line annealing and pickling
Heat time control is in every mm of thickness 55-70 seconds, 890-915 DEG C of annealed sheet temperature in stove；Strip straightening tension force in straightening
In 30-35 tons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710968644.3A CN107794443A (en) | 2017-10-18 | 2017-10-18 | A kind of production method of high-performing car exhaust tube steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710968644.3A CN107794443A (en) | 2017-10-18 | 2017-10-18 | A kind of production method of high-performing car exhaust tube steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107794443A true CN107794443A (en) | 2018-03-13 |
Family
ID=61533382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710968644.3A Pending CN107794443A (en) | 2017-10-18 | 2017-10-18 | A kind of production method of high-performing car exhaust tube steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107794443A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294260A (en) * | 2007-04-24 | 2008-10-29 | 宝山钢铁股份有限公司 | High-strength stainless cold-rolled steel strip and method for manufacturing same |
| CN101768702A (en) * | 2008-12-31 | 2010-07-07 | 宝山钢铁股份有限公司 | Medium-chromium ferrite stainless steel for automobile with high formability and acidic corrosion resistance as well as manufacturing method thereof |
| CN104109809A (en) * | 2014-06-20 | 2014-10-22 | 宝钢不锈钢有限公司 | High formability and low-chromium ferrite stainless steel and making method thereof |
| CN106435352A (en) * | 2016-06-30 | 2017-02-22 | 宝钢不锈钢有限公司 | Sn-containing ferrite stainless steel with low cost and high corrosion resistance, and manufacturing method thereof |
-
2017
- 2017-10-18 CN CN201710968644.3A patent/CN107794443A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294260A (en) * | 2007-04-24 | 2008-10-29 | 宝山钢铁股份有限公司 | High-strength stainless cold-rolled steel strip and method for manufacturing same |
| CN101768702A (en) * | 2008-12-31 | 2010-07-07 | 宝山钢铁股份有限公司 | Medium-chromium ferrite stainless steel for automobile with high formability and acidic corrosion resistance as well as manufacturing method thereof |
| CN104109809A (en) * | 2014-06-20 | 2014-10-22 | 宝钢不锈钢有限公司 | High formability and low-chromium ferrite stainless steel and making method thereof |
| CN106435352A (en) * | 2016-06-30 | 2017-02-22 | 宝钢不锈钢有限公司 | Sn-containing ferrite stainless steel with low cost and high corrosion resistance, and manufacturing method thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20180313 |