CN105039854A - Annealing method of ferritic stainless steel plate - Google Patents
Annealing method of ferritic stainless steel plate Download PDFInfo
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- CN105039854A CN105039854A CN201510510514.6A CN201510510514A CN105039854A CN 105039854 A CN105039854 A CN 105039854A CN 201510510514 A CN201510510514 A CN 201510510514A CN 105039854 A CN105039854 A CN 105039854A
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Abstract
The invention relates to an annealing method of a ferritic stainless steel plate. The method is that the ferritic stainless steel plate is prepared from the following components in percentage by weight: not greater than 0.06% of C, not greater than 0.50% of Si, not greater than 1.00% of Mn, not greater than 0.035% of P, not greater than 0.030% of S, 16-18% of Cr, not greater than 0.60% of Ni, not greater than 0.030% of N, and the balance Fe and inevitable impurities. The method comprises the following steps: I, feeding a low-chromium ferritic stainless steel plate into a continuous annealing furnace, and then heating the low-chromium ferritic stainless steel plate to be 850 to 860 DEG C, wherein the processing speed is 29 to 31m/min, and the line length in annealing is 88 to 92m; II, cooling the annealed low-chromium ferritic stainless steel plate with water until the plate is 70 to 90 DEG C, and performing spraying and flowing pickling through a pickling bath, wherein the concentration of sulfuric acid is 270 to 278g/l, and the temperature is 90 to 94 DEG C; the concentration of hydrofluoric acid is 10 to 18g/l; the concentration of nitric acid is 139 to 149g/l; the mixing temperature of hydrofluoric acid and nitric acid is 49 to 59 DEG C, and the mixing costs 2.85-3.15 minutes. According to the method, the continuous annealing is carried out to avoid grain boundary sensitization, and thus the time of annealing the ferritic stainless steel plate can be decreased.
Description
Technical field
The present invention relates to a kind of method for annealing of ferritic stainless steel, further relate to a kind of method for annealing of ferrite stainless steel.
Background technology
Ferritic stainless steel is that one mainly uses steel grade, and Application Areas is extensive.But owing to needing through cover annealing after hot rolling.And bell furnace can not continuous annealing, anneal about about 45h, and annealing time is long, and production efficiency is low.
Summary of the invention
In order to overcome the above-mentioned deficiency of the method for annealing of existing ferrite stainless steel, the invention provides the method for annealing of the short ferrite stainless steel of a kind of annealing time.
The present invention proposes a kind of method of ferrite stainless steel continuous annealing, is selected suitable temperature and is crossed linear velocity, realize the process of continuous annealing by the optimization of technique.
The principle of institute of the present invention foundation is: ferritic stainless steel, by bell furnace long term annealing, reaches homogenization of composition, and tissue is replied, and hardness reduces, and unit elongation improves, and facilitates follow-up rolling process to be rolled.But bell furnace duration, efficiency are low, the present invention adjusts the online annealing temperature of ferrite stainless steel and process speed, and adjust rational acid cleaning process, after reaching continuous annealing, hardness reduces, and unit elongation improves, and does not send crystal boundary sensitization, after cold line annealing and pickling, surface quality, performance and common process are suitable.
The present invention is the annealing process by changing hot rolling raw material coil of strip, namely changes continuous annealing process into by original batch annealing, selects suitable annealing temperature, crosses linear velocity, and suitable pickling concentration, reaches the object of continuous annealing.
The method for annealing of this ferrite stainless steel, the weight percent of ferrite stainless steel composition is:
C≤0.06%，Si≤0.50%，Mn≤1.00%，P≤0.035%，S≤0.030%，
Cr16 ~ 18%, Ni≤0.60%, N≤0.030%, all the other are Fe and inevitable impurity;
It is the step of following precedence:
ilow chrome ferritic stainless steel plate is entered continuous annealing furnace, low chrome ferritic stainless steel plate is heated to 850 ~ 860 DEG C, process speed 29 ~ 31m/min, anneal line length 88 ~ 92m;
iIlow chrome ferritic stainless steel plate water-cooled to 70 ~ 90 DEG C after annealing, enter pickling tank and carry out the pickling of spray flowacid-cleaning; Sulfuric acid concentration 270 ~ 278g/l, temperature 90 ~ 94 DEG C; Hydrofluoric acid concentration 10 ~ 18g/l, concentration of nitric acid 139 ~ 149g/l, the nitration mixture temperature of hydrofluoric acid and nitric acid is 49 ~ 59 DEG C, time 2.85 ~ 3.15min minute.
The method for annealing of this ferrite stainless steel, after annealing, the yield strength/Mpa of ferrite stainless steel reaches 285 ~ 315, and tensile strength/Mpa reaches 490 ~ 530, and unit elongation/% reaches 31 ~ 59, and hardness HV reaches 133 ~ 151.
Further, the method for annealing of this ferrite stainless steel, the weight percent of the C in the ferrite stainless steel described in it, Si, Mn, Ni and N is respectively:
０＜C≤0.06%，０＜Si≤0.50%，０＜Mn≤1.00%，０＜Ni≤0.60%，０＜N≤0.030%。
Beneficial effect of the present invention
Continuous annealing is carried out, by continuous annealing, under the prerequisite ensureing coil of strip surface quality by this technique, avoid crystal boundary sensitization, shorten the annealing time of ferrite stainless steel, annealing time is no more than 4min, pickling time is no more than 4min, improves production efficiency, can meet continuous seepage requirement.There is not sensitization in hot rolling pickling rear surface.And cold drawing end properties and conventional material property quite, can meet inner quality standard.After annealing, the yield strength/Mpa of ferrite stainless steel reaches 285 ~ 315, and tensile strength/Mpa reaches 490 ~ 530, and unit elongation/% reaches 31 ~ 59, and hardness HV reaches 133 ~ 151.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, to have further understanding to design of the present invention, the technical problem solved, technical characteristic.But following be embodiment is not limitation of the present invention.
embodiment one
The mass percent of the low chrome ferritic stainless steel plate composition of the present embodiment annealing is:
C：0.04%，Si：0.30%，Mn：0.35%，P：0.018%，S：0.0013%，
Cr:16.18%, Ni:0.16%, N:0.019%, all the other are Fe and inevitable impurity;
The length of low chrome ferritic stainless steel plate is 551m, wide 1500mm, thickness of slab 4.0mm;
Low chrome ferritic stainless steel plate is entered continuous annealing furnace, low chrome ferritic stainless steel plate is heated to 850 DEG C, process speed 30m/min, anneal line length 90m, i.e. anneal 3min;
Low chrome ferritic stainless steel plate water-cooled to 81 DEG C after annealing, enters pickling tank and carries out the pickling of spray flowacid-cleaning.The Pressure, Concentration, Temperature of pickle solution is: sulfuric acid concentration 277.5g/l, temperature 92 DEG C; Hydrofluoric acid concentration 14.3g/l, concentration of nitric acid 143.2g/l, the nitration mixture temperature of hydrofluoric acid and nitric acid is 53 DEG C, time 2.5min.
Hot line punishment in advance is steady, reduction of speed does not occur and plate temperature fluctuates, and cold drawing end properties meets inner quality standard.
After pickling cooling, low chrome ferritic stainless steel board finished product performance is in table 1.
Table 1
| Yield strength/Mpa | Tensile strength/Mpa | Unit elongation/% | Hardness HV | Bending |
| 307 | 515 | 36.5 | 143/144/143 | Qualified |
embodiment two
The mass percent of the low chrome ferritic stainless steel plate composition of the present embodiment annealing is:
C：0.03%，Si：0.32%，Mn：0.30%，P：0.021%，S：0.0014%，
Cr:16.16%, Ni:0.17%, N:0.019%, all the other are Fe and inevitable impurity.
The length of low chrome ferritic stainless steel plate is 546m, wide 1500mm, thickness of slab 4.0mm;
Low chrome ferritic stainless steel plate is entered continuous annealing furnace, low chrome ferritic stainless steel plate is heated to 860 DEG C, process speed 30m/min, anneal line length 90m, i.e. anneal 3min;
Low chrome ferritic stainless steel plate water-cooled to 82 DEG C after annealing, enters pickling tank and carries out the pickling of spray flowacid-cleaning.The Pressure, Concentration, Temperature of pickle solution is: sulfuric acid concentration 272.4g/l, temperature 93 DEG C; Hydrofluoric acid concentration 14.1g/l, concentration of nitric acid 148.2g/l, the nitration mixture temperature of hydrofluoric acid and nitric acid is 52 DEG C, time 3min.
Hot line punishment in advance is steady, reduction of speed does not occur and plate temperature fluctuates, and cold drawing end properties meets inner quality standard.
After pickling cooling, low chrome ferritic stainless steel board finished product performance is in table 2.
Table 2
| Yield strength/Mpa | Tensile strength/Mpa | Unit elongation/% | Hardness HV | Bending |
| 305 | 509 | 40.5 | 144/144/144 | Qualified |
embodiment three
The mass percent of the low chrome ferritic stainless steel plate composition of the present embodiment annealing is:
C：0.04%，Si：0.35%，Mn：0.31%，P：0.023%，S：0.0015%，
Cr:16.18%, Ni:0.16%, N:0.021%, all the other are Fe and inevitable impurity.
The length of low chrome ferritic stainless steel plate is 542m, wide 1500mm, thickness of slab 4.0mm;
Low chrome ferritic stainless steel plate is entered continuous annealing furnace, low chrome ferritic stainless steel plate is heated to 855 DEG C, process speed 30m/min, anneal line length 90m, i.e. anneal 3min;
Low chrome ferritic stainless steel plate water-cooled to 81 DEG C after annealing, enters pickling tank and carries out the pickling of spray flowacid-cleaning.The Pressure, Concentration, Temperature of pickle solution is: sulfuric acid concentration 277.5g/l, temperature 92 DEG C; Hydrofluoric acid concentration 14.3g/l, concentration of nitric acid 143.2g/l, the nitration mixture temperature of hydrofluoric acid and nitric acid is 51 DEG C, time 3min.
Hot line punishment in advance is steady, reduction of speed does not occur and plate temperature fluctuates, and cold drawing end properties meets inner quality standard.
After pickling cooling, low chrome ferritic stainless steel board finished product performance is in table 3.
Table 3
| Yield strength/Mpa | Tensile strength/Mpa | Unit elongation/% | Hardness HV | Bending |
| 306 | 510 | 38.5 | 143/144/144 | Qualified |
Claims (3)
1. a method for annealing for ferrite stainless steel, the weight percent of ferrite stainless steel composition is:
C≤0.06%，Si≤0.50%，Mn≤1.00%，P≤0.035%，S≤0.030%，
Cr16 ~ 18%, Ni≤0.60%, N≤0.030%, all the other are Fe and inevitable impurity;
It is the step of following precedence:
ilow chrome ferritic stainless steel plate is entered continuous annealing furnace, low chrome ferritic stainless steel plate is heated to 850 ~ 860 DEG C, process speed 29 ~ 31m/min, anneal line length 88 ~ 92m;
iIlow chrome ferritic stainless steel plate water-cooled to 70 ~ 90 DEG C after annealing, enter pickling tank and carry out the pickling of spray flowacid-cleaning; Sulfuric acid concentration 270 ~ 278g/l, temperature 90 ~ 94 DEG C; Hydrofluoric acid concentration 10 ~ 18g/l, concentration of nitric acid 139 ~ 149g/l, the nitration mixture temperature of hydrofluoric acid and nitric acid is 49 ~ 59 DEG C, time 2.85 ~ 3.15min minute.
2. the method for annealing of ferrite stainless steel according to claim 1, is characterized in that: after annealing, the yield strength/Mpa of ferrite stainless steel reaches 285 ~ 315, and tensile strength/Mpa reaches 490 ~ 530, and unit elongation/% reaches 31 ~ 59, and hardness HV reaches 133 ~ 151.
3., according to the method for annealing of the arbitrary described ferrite stainless steel of claim 1 or 2, it is characterized in that the weight percent of the C in described ferrite stainless steel, Si, Mn, Ni and N is respectively:
０＜C≤0.06%，０＜Si≤0.50%，０＜Mn≤1.00%，０＜Ni≤0.60%，０＜N≤0.030%。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114015846A (en) * | 2021-10-19 | 2022-02-08 | 山西太钢不锈钢股份有限公司 | Process method for reducing yield strength of low-chromium ferrite stainless steel |
| CN114941060A (en) * | 2022-05-18 | 2022-08-26 | 山西太钢不锈钢股份有限公司 | Method for reducing annealing mark of medium-chromium ferrite stainless steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003286592A (en) * | 2002-03-29 | 2003-10-10 | Sumitomo Metal Ind Ltd | Pickling process for stainless steel strip |
| CN102367548A (en) * | 2011-10-10 | 2012-03-07 | 刘群联 | Method for producing ferrite stainless steel pipe |
| CN102650019A (en) * | 2011-02-24 | 2012-08-29 | 宝山钢铁股份有限公司 | High-strength and high-hardness medium-chromium ferritic stainless steel and manufacturing method thereof |
| CN103966409A (en) * | 2013-01-31 | 2014-08-06 | 宝钢不锈钢有限公司 | Manufacturing method for medium chrome ferrite stainless steel |
| CN104328260A (en) * | 2014-10-31 | 2015-02-04 | 山西太钢不锈钢股份有限公司 | Method for solving transverse cracks of ferrite stainless steel square billet |
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- 2015-08-20 CN CN201510510514.6A patent/CN105039854A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003286592A (en) * | 2002-03-29 | 2003-10-10 | Sumitomo Metal Ind Ltd | Pickling process for stainless steel strip |
| CN102650019A (en) * | 2011-02-24 | 2012-08-29 | 宝山钢铁股份有限公司 | High-strength and high-hardness medium-chromium ferritic stainless steel and manufacturing method thereof |
| CN102367548A (en) * | 2011-10-10 | 2012-03-07 | 刘群联 | Method for producing ferrite stainless steel pipe |
| CN103966409A (en) * | 2013-01-31 | 2014-08-06 | 宝钢不锈钢有限公司 | Manufacturing method for medium chrome ferrite stainless steel |
| CN104328260A (en) * | 2014-10-31 | 2015-02-04 | 山西太钢不锈钢股份有限公司 | Method for solving transverse cracks of ferrite stainless steel square billet |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114015846A (en) * | 2021-10-19 | 2022-02-08 | 山西太钢不锈钢股份有限公司 | Process method for reducing yield strength of low-chromium ferrite stainless steel |
| CN114941060A (en) * | 2022-05-18 | 2022-08-26 | 山西太钢不锈钢股份有限公司 | Method for reducing annealing mark of medium-chromium ferrite stainless steel |
| CN114941060B (en) * | 2022-05-18 | 2023-12-29 | 山西太钢不锈钢股份有限公司 | Method for reducing annealing print of medium chromium ferrite stainless steel |
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Application publication date: 20151111 |