CN102876871A - Method for preparing stainless steel band for exhaust pipe of automobile - Google Patents
Method for preparing stainless steel band for exhaust pipe of automobile Download PDFInfo
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- CN102876871A CN102876871A CN 201210359944 CN201210359944A CN102876871A CN 102876871 A CN102876871 A CN 102876871A CN 201210359944 CN201210359944 CN 201210359944 CN 201210359944 A CN201210359944 A CN 201210359944A CN 102876871 A CN102876871 A CN 102876871A
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Abstract
The invention discloses a method for preparing a stainless steel band for an exhaust pipe of an automobile. The stainless steel band comprises the following components in percentage by weight: 0.1 to 0.3 percent of C, 0.6 to 0.7 percent of Si, 0.4 to 0.5 percent of Mn, 0.01 to 0.04 percent of P, 13.0 to 14.0 percent of Cr, 1.2 to 1.4 percent of Nb, 2.2 to 2.4 percent of Mo, 0.25 to 0.45 percent of Ti, 1.6 to 1.8 percent of Cu and the balance of Fe and inevitable impurities, wherein an Nb precipitate is 0.8 to 1.0 size percent, and the diameter of the Nb precipitate is 0.1 to 1 micrometer. The method comprises the following steps of: (1) smelting, performing hot rolling, annealing and performing acid washing; (2) performing cold rolling for the first time; (3) annealing; (4) performing cold rolling for the second time; (5) annealing; and (6), straightening, shearing longitudinally and packaging.
Description
Technical field
The present invention relates to the ferrous materials processing technique field, particularly the preparation method of the effective Stainless Steel Band of a kind of auto exhaust.
Background technology
Automobile exhaust pipe is in the automobile rear end, and residing operating ambient temperature is very high, and very high to thermotolerance, shock resistance and erosion resistance requirement, these members are made by steel plate by means of press working, therefore require the mother metal steel plate to have pressure forming.On the other hand, the envrionment temperature of use also improves year by year, is necessary to increase the addition of the alloying elements such as Cr, Mo, Nb and improves hot strength, oxidation-resistance and thermal fatigue characteristics etc.When adding the element increase, adopt simple manufacture method that the processibility of mother metal steel plate is reduced, therefore usually can not carry out pressure forming.
The index of processibility has ductility and deep drawing etc., but in the processing of vapor pipe, important having becomes elongation and the r value of basic index.At present in the production process of internal sheet metal because that deformation rate and technique passage are grasped during finish rolling is bad, straightening tension force, speed are improper, cause thickness and precision not high, the template poor quality.The situations such as crackle and stammerer often appear when causing the automobile exhaust pipe tubulation.Aspect the raising of r value, strengthening cold rolling draft is effectively, and still, the material (about 1.5～2mm) that above-mentioned member will be thicker is as mother metal, so in the existing manufacturing process that the thickness of cold rolling mother metal is limited to a certain degree, can not fully guarantee cold rolling draft.
In order to address this problem, many time have been descended at composition and manufacture method, in order to make r be worth improving without detriment to hot properties.
In the prior art, CN102107209 discloses a kind of manufacturing method of stainless steel band for automobile exhaust pipe, but it mainly relates to the improvement to rolling technology, the material that adopts still is the existing stainless steel trade mark 304 stainless steels, and the problems referred to above that cause owing to 304 stainless compositions do not obtain basic overcoming.
Unexamined Patent 9-279312 communique discloses following technology, namely improve the above-mentioned plasticity that is used as the ferrite series stainless steel plate of high temperature steel by the composition adjustment, if just like this, then for the lower thickening material of cold rolling draft, have the problems such as punching press crackle.
JP 2002-30346 communique has stipulated that hot fine rolling begins temperature, finishing temperature, and the best hot-rolled sheet annealing temperature definite according to the relation between Nb content and the hot-rolled sheet annealing temperature, but especially, owing to be the impact of other relevant element of precipitate (C, N, Cr, Mo etc.) with Nb, if just like this, then usually can not obtain sufficient processibility.In addition, Unexamined Patent 8-199235 communique discloses the method for hot-rolled sheet being carried out 1～30 hour ageing treatment in 650～900 ℃ scope.This is the technological thought that promotes recrystallize before cold rolling by the Nb precipitate is separated out, even if but use the method, also usually can not obtain sufficient processibility, the problem that exists production efficiency significantly to descend.
Summary of the invention
For the deficiencies in the prior art, one of purpose of the present invention is to provide the preparation method of the effective Stainless Steel Band of a kind of auto exhaust.
For achieving the above object, the technical solution used in the present invention is as follows:
The preparation method of the effective Stainless Steel Band of a kind of auto exhaust, described Stainless Steel Band is comprised of following component by weight percentage: C:0.1～0.3%, Si:0.6～0.7%, Mn:0.4～0.5%, P:0.01～0.04%, Cr:13.0～14.0%, Nb:1.2～1.4%, Mo:2.2～2.4%, Ti:0.25～0.45%, Cu:1.6～1.8%, surplus by Fe and inevitably impurity consist of, and wherein Nb be precipitate take volume % count 0.8%～1.0% and diameter as 0.1 μ m～1 μ m; Described preparation method comprises the steps:
(1) melting is satisfied the steel of above-mentioned composition and it is cast as slab, and hot rolling slab makes it to become the thick coils of hot-rolled steel of 4～5mm then, then annealing and pickling;
(2) for the first time cold rolling: as to adopt four roller finishing rolling mill units to be rolled, cold rolling 5～6 passages, F strain 18～20KN, backward pull 12～14KN, technological lubrication oil 40#, the steel band roll speed is 60～70 Mi ∕ minutes, and coils of hot-rolled steel is rolled into 1.8～2.2mm;
(3) anneal: the cold-rolled steel strip that step (2) is obtained enters annealing furnace with 6～8 Mi ∕ minute speed, and the temperature in the annealing furnace is 1060～1080 ℃, is filled with simultaneously shielding gas;
(4) for the second time cold rolling: adopt 20 roller Sendzimir finishing rolling mills to be rolled, cold rolling 2～3 passages, F strain 10～12KN, backward pull 7～9KN, technological lubrication oil 40#, the steel band roll speed is 100～120 Mi ∕ minutes; Steel band after step (3) anneal is rolled into the steel band that thickness is 1.2～1.25mm, and thickness deviation is ± 0.01mm;
(5) anneal: the cold-rolled steel strip that step (4) is obtained enters annealing furnace with 6～8 Mi ∕ minute speed, and the temperature in the annealing furnace is 1060～1080 ℃, is filled with simultaneously shielding gas;
(6) straightening, slitting and packing.
Preparation method of the present invention has following beneficial effect:
(1) the present invention is according to the high temperature resistant and corrosion resistant applying working condition of the effective steel needs of auto exhaust, and the processing requirement of stainless steel forming process designed composition and the tissue of steel, adds so that stainless high temperature resistant and intergranular corrosion resistance excellent performance by an amount of proportioning of Cr, Mo, Ti and Cu.
(2) by adding suitable Nb, and the processing parameter of controlled working process, thereby the amount of separating out of control Nb compound, so that stainless elongation and r value satisfy processing request, thereby so that stainless processing characteristics is good, satisfy the processing request of automobile exhaust pipe.
Embodiment
Embodiment one
The preparation method of the effective Stainless Steel Band of a kind of auto exhaust, described Stainless Steel Band is comprised of following component by weight percentage: C:0.1%, Si:0.7%, Mn:0.4%, P:0.04%, Cr:13.0%, Nb:1.4%, Mo:2.2%, Ti:0.45%, Cu:1.6%, surplus by Fe and inevitably impurity consist of, and wherein Nb be precipitate take volume % count 0.8%～1.0% and diameter as 0.1 μ m～1 μ m; Described preparation method comprises the steps:
(1) melting is satisfied the steel of above-mentioned composition and it is cast as slab, and hot rolling slab makes it to become the thick coils of hot-rolled steel of 4mm then, then annealing and pickling;
(2) for the first time cold rolling: adopt four roller finishing rolling mill units to be rolled, cold rolling 5 passages, F strain 20KN, backward pull 12KN, technological lubrication oil 40#, the steel band roll speed is 70 Mi ∕ minutes, and coils of hot-rolled steel is rolled into 2.2mm;
(3) anneal: the cold-rolled steel strip that step (2) is obtained enters annealing furnace with 6 Mi ∕ minute speed, and the temperature in the annealing furnace is 1080 ℃, is filled with simultaneously shielding gas;
(4) for the second time cold rolling: adopt 20 roller Sendzimir finishing rolling mills to be rolled, cold rolling 2 passages, F strain 12KN, backward pull 7KN, technological lubrication oil 40#, the steel band roll speed is 120 Mi ∕ minutes; Steel band after step (3) anneal is rolled into the steel band that thickness is 1.2mm, and thickness deviation is ± 0.01mm;
(5) anneal: the cold-rolled steel strip that step (4) is obtained enters annealing furnace with 6 Mi ∕ minute speed, and the temperature in the annealing furnace is 1080 ℃, is filled with simultaneously shielding gas;
(6) straightening, slitting and packing.
Embodiment two
The preparation method of the effective Stainless Steel Band of a kind of auto exhaust, described Stainless Steel Band is comprised of following component by weight percentage: C:0.3%, Si:0.6%, Mn:0.5%, P:0.01%, Cr:14.0%, Nb:1.2%, Mo:2.4%, Ti:0.25%, Cu:1.8%, surplus by Fe and inevitably impurity consist of, and wherein Nb be precipitate take volume % count 0.8%～1.0% and diameter as 0.1 μ m～1 μ m; Described preparation method comprises the steps:
(1) melting is satisfied the steel of above-mentioned composition and it is cast as slab, and hot rolling slab makes it to become the thick coils of hot-rolled steel of 5mm then, then annealing and pickling;
(2) for the first time cold rolling: adopt four roller finishing rolling mill units to be rolled, cold rolling 6 passages, F strain 18KN, backward pull 14KN, technological lubrication oil 40#, the steel band roll speed is 60 Mi ∕ minutes, and coils of hot-rolled steel is rolled into 1.8mm;
(3) anneal: the cold-rolled steel strip that step (2) is obtained enters annealing furnace with 8 Mi ∕ minute speed, and the temperature in the annealing furnace is 1060 ℃, is filled with simultaneously shielding gas;
(4) for the second time cold rolling: adopt 20 roller Sendzimir finishing rolling mills to be rolled, cold rolling 3 passages, F strain 10KN, backward pull 9KN, technological lubrication oil 40#, the steel band roll speed is 100 Mi ∕ minutes; Steel band after step (3) anneal is rolled into the steel band that thickness is 1.25mm, and thickness deviation is ± 0.01mm;
(5) anneal: the cold-rolled steel strip that step (4) is obtained enters annealing furnace with 8 Mi ∕ minute speed, and the temperature in the annealing furnace is 1060 ℃, is filled with simultaneously shielding gas;
(6) straightening, slitting and packing.
Embodiment three
The preparation method of the effective Stainless Steel Band of a kind of auto exhaust, described Stainless Steel Band is comprised of following component by weight percentage: C:0.2%, Si:0.65%, Mn:0.45%, P:0.025%, Cr:13.5%, Nb:1.3%, Mo:2.3%, Ti:0.35%, Cu:1.7%, surplus by Fe and inevitably impurity consist of, and wherein Nb be precipitate take volume % count 0.8%～1.0% and diameter as 0.1 μ m～1 μ m; Described preparation method comprises the steps:
(1) melting is satisfied the steel of above-mentioned composition and it is cast as slab, and hot rolling slab makes it to become the thick coils of hot-rolled steel of 4.5mm then, then annealing and pickling;
(2) for the first time cold rolling: adopt four roller finishing rolling mill units to be rolled, cold rolling 5 passages, F strain 19KN, backward pull 13KN, technological lubrication oil 40#, the steel band roll speed is 65 Mi ∕ minutes, and coils of hot-rolled steel is rolled into 2.0mm;
(3) anneal: the cold-rolled steel strip that step (2) is obtained enters annealing furnace with 7 Mi ∕ minute speed, and the temperature in the annealing furnace is 1070 ℃, is filled with simultaneously shielding gas;
(4) for the second time cold rolling: adopt 20 roller Sendzimir finishing rolling mills to be rolled, cold rolling 2 passages, F strain 11KN, backward pull 8KN, technological lubrication oil 40#, the steel band roll speed is 110 Mi ∕ minutes; Steel band after step (3) anneal is rolled into the steel band that thickness is 1.23mm, and thickness deviation is ± 0.01mm;
(5) anneal: the cold-rolled steel strip that step (4) is obtained enters annealing furnace with 7 Mi ∕ minute speed, and the temperature in the annealing furnace is 1070 ℃, is filled with simultaneously shielding gas;
(6) straightening, slitting and packing.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, does not mean that namely the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.The person of ordinary skill in the field should understand, any improvement in the present invention to the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (1)
1. the preparation method of the effective Stainless Steel Band of auto exhaust, it is characterized in that, described Stainless Steel Band is comprised of following component by weight percentage: C:0.1～0.3%, Si:0.6～0.7%, Mn:0.4～0.5%, P:0.01～0.04%, Cr:13.0～14.0%, Nb:1.2～1.4%, Mo:2.2～2.4%, Ti:0.25～0.45%, Cu:1.6～1.8%, surplus by Fe and inevitably impurity consist of, and wherein Nb be precipitate take volume % count 0.8%～1.0% and diameter as 0.1 μ m～1 μ m; Described preparation method comprises the steps:
(1) melting is satisfied the steel of above-mentioned composition and it is cast as slab, and hot rolling slab makes it to become the thick coils of hot-rolled steel of 4～5mm then, then annealing and pickling;
(2) for the first time cold rolling: as to adopt four roller finishing rolling mill units to be rolled, cold rolling 5～6 passages, F strain 18～20KN, backward pull 12～14KN, technological lubrication oil 40#, the steel band roll speed is 60～70 Mi ∕ minutes, and coils of hot-rolled steel is rolled into 1.8～2.2mm;
(3) anneal: the cold-rolled steel strip that step (2) is obtained enters annealing furnace with 6～8 Mi ∕ minute speed, and the temperature in the annealing furnace is 1060～1080 ℃, is filled with simultaneously shielding gas;
(4) for the second time cold rolling: adopt 20 roller Sendzimir finishing rolling mills to be rolled, cold rolling 2～3 passages, F strain 10～12KN, backward pull 7～9KN, technological lubrication oil 40#, the steel band roll speed is 100～120 Mi ∕ minutes; Steel band after step (3) anneal is rolled into the steel band that thickness is 1.2～1.25mm, and thickness deviation is ± 0.01mm;
(5) anneal: the cold-rolled steel strip that step (4) is obtained enters annealing furnace with 6～8 Mi ∕ minute speed, and the temperature in the annealing furnace is 1060～1080 ℃, is filled with simultaneously shielding gas;
(6) straightening, slitting and packing.
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| CN 201210359944 CN102876871A (en) | 2012-09-24 | 2012-09-24 | Method for preparing stainless steel band for exhaust pipe of automobile |
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| CN 201210359944 CN102876871A (en) | 2012-09-24 | 2012-09-24 | Method for preparing stainless steel band for exhaust pipe of automobile |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039671A (en) * | 2015-06-30 | 2015-11-11 | 安徽飞达新材料科技股份有限公司 | Stainless steel cold-rolled sheet processing technology |
| CN107695101A (en) * | 2017-10-18 | 2018-02-16 | 云南钛业股份有限公司 | Method for producing titanium/titanium alloy strip by combining short-process four-roller mill and twenty-roller mill |
| CN108954992A (en) * | 2018-09-09 | 2018-12-07 | 宁波松鹰汽车部件有限公司 | A kind of expansion valve damping folder and its processing method |
| CN110462081A (en) * | 2017-03-29 | 2019-11-15 | 日铁不锈钢株式会社 | The excellent ferrite-group stainless steel of high temperature abrasion resistance, the manufacturing method of ferrite series stainless steel plate, exhaust component, high temperature slide unit and component of turbo-charger |
| CN113399456A (en) * | 2021-06-30 | 2021-09-17 | 新余钢铁股份有限公司 | Ultrathin 65Mn cold-rolled wide steel strip and manufacturing method thereof |
| CN114985453A (en) * | 2022-06-27 | 2022-09-02 | 新余钢铁股份有限公司 | Thick spring steel 51CrV4 cold-rolled wide steel strip and manufacturing method thereof |
-
2012
- 2012-09-24 CN CN 201210359944 patent/CN102876871A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039671A (en) * | 2015-06-30 | 2015-11-11 | 安徽飞达新材料科技股份有限公司 | Stainless steel cold-rolled sheet processing technology |
| CN110462081A (en) * | 2017-03-29 | 2019-11-15 | 日铁不锈钢株式会社 | The excellent ferrite-group stainless steel of high temperature abrasion resistance, the manufacturing method of ferrite series stainless steel plate, exhaust component, high temperature slide unit and component of turbo-charger |
| CN110462081B (en) * | 2017-03-29 | 2021-10-22 | 日铁不锈钢株式会社 | Ferritic stainless steel having excellent high-temperature wear resistance, method for producing ferritic stainless steel sheet, exhaust gas component, high-temperature sliding component, and turbocharger component |
| CN107695101A (en) * | 2017-10-18 | 2018-02-16 | 云南钛业股份有限公司 | Method for producing titanium/titanium alloy strip by combining short-process four-roller mill and twenty-roller mill |
| CN107695101B (en) * | 2017-10-18 | 2019-06-21 | 云南钛业股份有限公司 | Method for producing titanium/titanium alloy strip by combining short-process four-roller mill and twenty-roller mill |
| CN108954992A (en) * | 2018-09-09 | 2018-12-07 | 宁波松鹰汽车部件有限公司 | A kind of expansion valve damping folder and its processing method |
| CN113399456A (en) * | 2021-06-30 | 2021-09-17 | 新余钢铁股份有限公司 | Ultrathin 65Mn cold-rolled wide steel strip and manufacturing method thereof |
| CN114985453A (en) * | 2022-06-27 | 2022-09-02 | 新余钢铁股份有限公司 | Thick spring steel 51CrV4 cold-rolled wide steel strip and manufacturing method thereof |
| CN114985453B (en) * | 2022-06-27 | 2023-12-05 | 新余钢铁股份有限公司 | Thick spring steel 51CrV4 cold-rolled wide steel strip and manufacturing method thereof |
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Application publication date: 20130116 |