CN104962673A - Production method capable of preventing 65 Mn spring strip steel surface from red rust - Google Patents
Production method capable of preventing 65 Mn spring strip steel surface from red rust Download PDFInfo
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- CN104962673A CN104962673A CN201510360433.2A CN201510360433A CN104962673A CN 104962673 A CN104962673 A CN 104962673A CN 201510360433 A CN201510360433 A CN 201510360433A CN 104962673 A CN104962673 A CN 104962673A
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Abstract
A production method capable of preventing a 65 Mn spring strip steel surface from red rust includes the steps of conducting KR desulfuration on molten iron through lime and fluorite before steel-making, conducting conventional smelting through a converter, conducting deoxidation through FeMnSi and FeMn, conducting refining through a ladle furnace (LF), conducting continuous casting, conducting conventional rolling and winding, air-cooling strip steel rolls to 300 DEG C or lower, and stacking the rolls in multiple layers. By means of the method, the red rust phenomenon on the 65 Mn spring strip steel surface can be reduced and even eliminated, and the yield is increased by at least 1.5%.
Description
Technical field
The present invention relates to a kind of production method of spring steel, belong to a kind of production method that can prevent 65Mn barrel band surface from producing red rust particularly.
Background technology
At present, the 65Mn barrel band of production very easily produces surperficial red rust phenomenon, causes surface quality do not conform to and occur waste product.By analysis, one is owing to adopting FeMnSi+FeCr to carry out deoxidation alloying after converter tapping, and two is owing to after batching, carrying out multilayer stacking at high operating temperatures through hot rolling immediately, causing Si content in steel high, be namely greater than caused by 0.17%.
As through retrieval: the Tianjin examination about 65Mn mill coil that periodical is stepped on metallurgical August the 4th in 2006 is rolled, and Jiangxi Metallurgical periodical is stepped on June the 3rd in 2005 about 100t top and bottom combined blown converter produces two sections of documents of the smelting of 65Mn steel, the refining of LF stove, continuous casting process
It is exactly owing to adopting FeMnSi deoxidation, and in be bundled into point Si/wt% >=0.17, and adopt FeCr microalloying, liquid steel temperature reduced, also increases cost of alloy; Same employing rolling multi-layer stacking immediately after batching, therefore there is surface of steel plate red rust problem.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, provide a kind of can reduction even to eliminate 65Mn barrel band surface red rust phenomenon, improve the production method of the 65Mn barrel band of qualification rate at least 1.5%.
Realize the measure of above-mentioned purpose:
Can prevent 65Mn barrel band surface from producing a production method for red rust, its step:
1) carry out KR desulfurization to molten iron before steel-making, sweetening agent adopts lime and fluorite, and lime adds according to 5.4 ~ 9.0kg/ ton molten iron, and fluorite adds according to 0.6 ~ 1.0kg/ ton molten iron; Sulphur content in desulfurized molten iron controls at≤0.005wt%, and molten iron temperature controls at 1220 ~ 1350 DEG C; Blast-furnace smelting join ore deposit time, add containing Cr ore according to component requirements;
2) routine carries out converter smelting, controls tapping temperature at 1620 ~ 1670 DEG C; Time between tapping is to 1/3 ~ 2/3, add FeMnSi and FeMn and carry out deoxidation, wherein FeMnSi adds according to 5 ~ 8 kg/ ton steel, and FeMn adds according to 5 ~ 8kg/ ton steel; And the Si content controlled in molten steel is no more than 0.15%;
3) carry out the refining of LF stove, refining time is not less than 30 minutes;
4) carry out continuous casting, control to open to water superheating temperature and be no more than 45 DEG C, and adopt the drainage of Cr matter stuffing sand, the add-on of Cr matter stuffing sand adds according to 0.29 ~ 0.31kg/ ton steel;
5) pair rolling batching;
6), when being with below steel roll temperature air cooling to 300 DEG C, multi-layer stacking is carried out.
Control Si content is no more than 0.15%, is that belt steel surface easily forms FeSiO due to when Si content exceedes this value
4, be difficult to high pressure water the iron scale removing surface during steel rolling, cause red rust.
Why the present invention adds containing Cr ore when blast-furnace smelting, instead of adds during making steel and carry out microalloying containing Cr alloy, be due to: one is add can reduce liquid steel temperature containing Cr alloy in tapping process, increases LF refining intensification load; Two is when alloy lumpiness is uneven, can produce Cr composition uneven, affect alloy result of use in molten steel; Three is increase cost.
Why the present invention adopts FeMnSi and FeMn to carry out deoxidation treatment during making steel, and mainly control Si content is within setting range, ensures deoxidation effect again simultaneously.
The present invention compared with prior art, can reduce and even eliminate 65Mn barrel band surface red rust phenomenon, improve qualification rate at least 1.5%.
Accompanying drawing explanation
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
Below the present invention is described in detail:
Embodiment 1
The product specification of the present embodiment is: trimmed size 2.75mm × 450mm; The weight percent of product composition is: C: 0.64%, Mn:1.15%, Si: 0.11%, P:0.014%, S:0.004%, Cr:0.2%, and remaining is Fe.
Production stage:
1) after blast-furnace smelting, carry out KR desulfurization, sweetening agent adopts lime and fluorite, and lime adds according to 5.5 kg/ ton molten iron, and fluorite adds according to 0.55 kg/ ton molten iron; Sulphur content in desulfurized molten iron controls at 0.0048wt%, and molten iron temperature controls at 1230 DEG C; Blast-furnace smelting join ore deposit time, according to composition setting requirement, add containing Cr ore;
2) routine carries out converter smelting, and tapping temperature is at 1622 DEG C; When tap to the total useful volume of molten steel 1/3 time, in tundish, add FeMnSi and FeMn carry out deoxidation, wherein FeMnSi adds according to 5.2 kg/ ton steel, and FeMn adds according to 5.1 kg/ ton steel; Because C content in molten steel does not reach setting requirement, therefore, be achieved by increasing increasing C agent; And the Si content controlled in molten steel is 0.148%;
3) carry out the refining of LF stove, refining time is 30 minutes;
4) carry out continuous casting, open and water superheating temperature at 45 DEG C, and adopt the drainage of Cr matter stuffing sand, the add-on of Cr matter stuffing sand adds according to 0.29 kg/ ton steel;
5) pair rolling batching;
6), when being with steel roll temperature air cooling to 295 DEG C, multi-layer stacking is carried out.
After testing, under the prerequisite of satisfied use mechanical property, its surface of steel plate human eye observation finds no red rust.
Embodiment 2
The product specification of the present embodiment is: trimmed size 2.50m × 350mm; The weight percent of product composition is: C: 0.65%, Mn:1.10%, Si: 0.12%, P:0.013%, S:0.003%, Cr:0.18%, and remaining is Fe.
Production stage:
1) after blast-furnace smelting, carry out KR desulfurization, sweetening agent adopts lime and fluorite, and lime adds according to 6.5 kg/ ton molten iron, and fluorite adds according to 0.65 kg/ ton molten iron; Sulphur content in desulfurized molten iron controls at 0.0045wt%, and molten iron temperature controls at 1283 DEG C; Blast-furnace smelting join ore deposit time, according to composition setting requirement, add containing Cr ore;
2) routine carries out converter smelting, and tapping temperature is at 1635 DEG C; When tap to the total useful volume of molten steel 1/2 time, in tundish, add FeMnSi and FeMn carry out deoxidation, wherein FeMnSi adds according to 6.2 kg/ ton steel, and FeMn adds according to 6.1 kg/ ton steel; Because C content in molten steel does not reach setting requirement, therefore, be achieved by increasing increasing C agent; And the Si content controlled in molten steel is 0.146%;
3) carry out the refining of LF stove, refining time is 31 minutes;
4) carry out continuous casting, open and water superheating temperature at 25 DEG C, and adopt the drainage of Cr matter stuffing sand, the add-on of Cr matter stuffing sand adds according to 0.295kg/ ton steel;
5) pair rolling batching;
6), when being with steel roll temperature air cooling to 290 DEG C, multi-layer stacking is carried out.
After testing, under the prerequisite of satisfied use mechanical property, its surface of steel plate human eye observation finds no red rust.
Embodiment 3
The product specification of the present embodiment is: trimmed size 3.00mm × 420mm; The weight percent of product composition is: C: 0.66%, Mn:1.10%, Si: 0.12%, P:0.015%, S:0.0038%, Cr:0.17%, and remaining is Fe.
Production stage:
1) after blast-furnace smelting, carry out KR desulfurization, sweetening agent adopts lime and fluorite, and lime adds according to 7.5 kg/ ton molten iron, and fluorite adds according to 0.75kg/ ton molten iron; Sulphur content in desulfurized molten iron controls at 0.0039wt%, and molten iron temperature controls at 1330 DEG C; Blast-furnace smelting join ore deposit time, according to composition setting requirement, add containing Cr ore;
2) routine carries out converter smelting, and tapping temperature is at 1645 DEG C; When tap to the total useful volume of molten steel 1/2 time, in tundish, add FeMnSi and FeMn carry out deoxidation, wherein FeMnSi adds according to 6.8 kg/ ton steel, and FeMn adds according to 6.6 kg/ ton steel; Because C content in molten steel does not reach setting requirement, therefore, be achieved by increasing increasing C agent; And the Si content controlled in molten steel is 0.143%;
3) carry out the refining of LF stove, refining time is 32 minutes;
4) carry out continuous casting, open and water superheating temperature at 42 DEG C, and adopt the drainage of Cr matter stuffing sand, the add-on of Cr matter stuffing sand adds according to 0.298kg/ ton steel;
5) pair rolling batching;
6), when being with steel roll temperature air cooling to 283 DEG C, multi-layer stacking is carried out.
After testing, under the prerequisite of satisfied use mechanical property, its surface of steel plate human eye observation finds no red rust.
Embodiment 4
The product specification of the present embodiment is: trimmed size 3.25mm × 400mm; The weight percent of product composition is: C: 0.68%, Mn:1.02%, Si: 0.148%, P:0.0135%, S:0.0038%, Cr:0.195%, and remaining is Fe.
Production stage:
1) after blast-furnace smelting, carry out KR desulfurization, sweetening agent adopts lime and fluorite, and lime adds according to 9.2 kg/ ton molten iron, and fluorite adds according to 0.92kg/ ton molten iron; Sulphur content in desulfurized molten iron controls at 0.0032wt%, and molten iron temperature controls at 1350 DEG C; Blast-furnace smelting join ore deposit time, according to composition setting requirement, add containing Cr ore;
2) routine carries out converter smelting, and tapping temperature is at 1660 DEG C; When tap to the total useful volume of molten steel 2/3 time, in tundish, add FeMnSi and FeMn carry out deoxidation, wherein FeMnSi adds according to 7.2 kg/ ton steel, and FeMn adds according to 7.5 kg/ ton steel; Because C content in molten steel does not reach setting requirement, therefore, be achieved by increasing increasing C agent; And the Si content controlled in molten steel is 0.145%;
3) carry out the refining of LF stove, refining time is 31.5 minutes;
4) carry out continuous casting, open and water superheating temperature at 28 DEG C, and adopt the drainage of Cr matter stuffing sand, the add-on of Cr matter stuffing sand adds according to 0.30kg/ ton steel;
5) pair rolling batching;
6), when being with steel roll temperature air cooling to 293 DEG C, multi-layer stacking is carried out.
After testing, under the prerequisite of satisfied use mechanical property, its surface of steel plate human eye observation finds no red rust.
Embodiment 5
The product specification of the present embodiment is: trimmed size 2.75mm × 450mm; The weight percent of product composition is: C: 0.67%, Mn:1.05%, Si: 0.148%, P:0.0149%, S:0.0037%, Cr:0.194%, and remaining is Fe.
Production stage:
1) after blast-furnace smelting, carry out KR desulfurization, sweetening agent adopts lime and fluorite, and lime adds according to 7.8 kg/ ton molten iron, and fluorite adds according to 0.78kg/ ton molten iron; Sulphur content in desulfurized molten iron controls at 0.0025wt%, and molten iron temperature controls at 1340 DEG C; Blast-furnace smelting join ore deposit time, according to composition setting requirement, add containing Cr ore;
2) routine carries out converter smelting, and tapping temperature is at 1668 DEG C; When tap to the total useful volume of molten steel 2/3 time, in tundish, add FeMnSi and FeMn carry out deoxidation, wherein FeMnSi adds according to 7.8 kg/ ton steel, and FeMn adds according to 7.9 kg/ ton steel; Because C content in molten steel reaches setting requirement, therefore do not increase C agent; And the Si content controlled in molten steel is 0.140%;
3) carry out the refining of LF stove, refining time is 30.5 minutes;
4) carry out continuous casting, open and water superheating temperature at 43 DEG C, and adopt the drainage of Cr matter stuffing sand, the add-on of Cr matter stuffing sand adds according to 0.31kg/ ton steel;
5) pair rolling batching;
6), when being with steel roll temperature air cooling to 268 DEG C, multi-layer stacking is carried out.
After testing, under the prerequisite of satisfied use mechanical property, its surface of steel plate human eye observation finds no red rust.
This embodiment is only the best and exemplifies, the restricted enforcement not to technical solution of the present invention.
Claims (1)
1. can prevent 65Mn barrel band surface from producing a production method for red rust, its step:
1) carry out KR desulfurization to molten iron before steel-making, sweetening agent adopts lime and fluorite, and lime adds according to 5.4 ~ 9.0kg/ ton molten iron, and fluorite adds according to 0.6 ~ 1.0kg/ ton molten iron; Sulphur content in desulfurized molten iron controls at≤0.005wt%, and molten iron temperature controls at 1220 ~ 1350 DEG C; Blast-furnace smelting join ore deposit time, add containing Cr ore according to component requirements;
2) routine carries out converter smelting, controls tapping temperature at 1620 ~ 1670 DEG C; Time between tapping is to 1/3 ~ 2/3, add FeMnSi and FeMn and carry out deoxidation, wherein FeMnSi adds according to 5 ~ 8 kg/ ton steel, and FeMn adds according to 5 ~ 8kg/ ton steel; And the Si content controlled in molten steel is no more than 0.15%;
3) carry out the refining of LF stove, refining time is not less than 30 minutes;
4) carry out continuous casting, control to open to water superheating temperature and be no more than 45 DEG C, and adopt the drainage of Cr matter stuffing sand, the add-on of Cr matter stuffing sand adds according to 0.29 ~ 0.31kg/ ton steel;
5) pair rolling batching;
6), when being with below steel roll temperature air cooling to 300 DEG C, multi-layer stacking is carried out.
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| CN201510360433.2A CN104962673B (en) | 2015-06-26 | 2015-06-26 | A kind of production method that can prevent 65Mn barrel bands surface from producing red rust |
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| CN201510360433.2A CN104962673B (en) | 2015-06-26 | 2015-06-26 | A kind of production method that can prevent 65Mn barrel bands surface from producing red rust |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109355453A (en) * | 2018-11-28 | 2019-02-19 | 阳春新钢铁有限责任公司 | A kind of production method reducing gren rod surface red rust |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974721A (en) * | 2010-10-29 | 2011-02-16 | 河北钢铁股份有限公司唐山分公司 | Process for producing medium and high carbon steel in sheet billet continuous casting and rolling production |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974721A (en) * | 2010-10-29 | 2011-02-16 | 河北钢铁股份有限公司唐山分公司 | Process for producing medium and high carbon steel in sheet billet continuous casting and rolling production |
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| 《热轧带钢表面红锈成因分析》;黄红明 等;《鄂钢科技》;20131231;21-22 * |
| 《莱钢65Mn热轧窄带质量研究与改进》;费燕 等;《连铸》;20110131(第1期);38-44页 * |
| 《转炉钢水的炉外精炼技术》;俞海明;《转炉钢水的炉外精炼技术》;冶金工业出版社;20110831;105页 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109355453A (en) * | 2018-11-28 | 2019-02-19 | 阳春新钢铁有限责任公司 | A kind of production method reducing gren rod surface red rust |
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