CN100368583C - Thin gauge gas cylinder steel with good stamping performance and process for producing same - Google Patents
Thin gauge gas cylinder steel with good stamping performance and process for producing same Download PDFInfo
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- CN100368583C CN100368583C CNB2005100259799A CN200510025979A CN100368583C CN 100368583 C CN100368583 C CN 100368583C CN B2005100259799 A CNB2005100259799 A CN B2005100259799A CN 200510025979 A CN200510025979 A CN 200510025979A CN 100368583 C CN100368583 C CN 100368583C
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Abstract
The present invention relates to a hot rolling steel plate for a gas cylinder and a production method for the hot rolling steel plate, particularly to a gas cylinder with good punching performance and thin standard and a production method for the gas cylinder. The present invention has the technical problems that the toughness of steel types is poor, the punching resistant performance is poor, and the rolling requirement of a 1422mm rolling mill is not met. The present invention has the technical scheme that the gas cylinder with good punching performance and thin standard has the distribution ratio (weight %) of the components of 0.08-0.12% of C, less than or equal to 0.05 % of Si, 1.00 to 1.20 % of Mn, less than or equal to 0.025 % of P, less than or equal to. 015 % of S, 0.010 to 0.020 % of Nb, 0.010 to 0.030 % of Ti, 0.015 to 0.060 % of Al and less than or equal to 60 ppmN, and the rest is Fe and inevitable impurities in steel. The production method comprises the steps: firstly, according to the distribution ratio, a conventional rotary furnace is used for smelting; a steel blank is formed by continuous casting. The present invention is characterized in that when gas cylinder is rolled, a high temperature area is used for rolling; the temperature of a rough rolling outlet is from 1070 to 1090 DEG C, the thickness of a middle blank is 36mm, and the final rolling temperature is 870 DEG C; the high temperature rapid water cooling is carried out, and a steel coil is coiled at 580 to 620 DEG C. The gas cylinder steel of the present invention is mainly used for manufacturing a YSP-50 liquefied petroleum gas cylinder.
Description
Technical field: the present invention relates to gas cylinder with hot-rolled steel sheet and production method thereof, particularly a kind of have good stamping performance thin gauge gas cylinder steel and a production method thereof.
Background technology: present YSP-50 LP gas cylinder, the strength grade of its steel plate is a HP325 strength grade among the GB6653-94.In the GB6653-94 standard about the regulation of this steel grade: its product at composition (weight percent) is≤0.20%C, ≤ 0.35%Si, ≤ 1.50%Mn, ≤ 0.035%P ,≤0.035%S, 4.1.4 clause in the standard: for improving the performance of steel, can add one or more of trace element such as V, Nb, Ti in each trade mark steel, but should meet following provisions: V≤0.12%, Nb≤0.060%, Ti≤0.20%.Standard is very big to the scope of each element regulation in the steel, and actual operation is relatively poor.
" development that welded gas cylinder is used the HP325 hot-rolled steel sheet " document was arranged in 1991 the 6th phases of domestic periodical " this steel technology ", its product adopts 0.14-0.20%C at composition (weight percent), ≤ 0.30%Si, 1.00-1.50%Mn, ≤ 0.030%P ,≤0.035%S ,≤0.050%P+S, ≤ 0.30%Cu, all the other design this product for iron.Though its strength grade is guaranteed, but because carbon in the design of this product composition, manganese content are higher, steel plate shows as resistance to deformation when high temperature rolling bigger, the steel plate punching performance is general, so makes the iron and steel enterprise of the production line that has the 1422mm milling train because the restriction of rolling pressure can't rolling this steel grade.
Summary of the invention: what the objective of the invention is to develop the low manganese content of a kind of low-carbon (LC) has good stamping performance thin gauge gas cylinder steel and a production method thereof.The technical issues that need to address of the present invention are: improve the toughness of steel grade, make it have good anti-impact and press performance, satisfy the rolling requirement of 1422mm milling train.For achieving the above object, technical scheme of the present invention is: a kind of have a good stamping performance thin gauge gas cylinder steel, and its composition proportion (weight %) is: 0.08～0.12%C ,≤0.05%Si, 1.00～1.20%Mn, ≤ 0.025%P ,≤0.015%S, 0.010～0.020%Nb, 0.010～0.030%Ti, 0.015～0.060%Al ,≤60ppmN, all the other are unavoidable impurities in Fe and the steel.
The present invention adopts lower carbon content in the composition design, add an amount of manganese strengthened steel plate, the niobium element that adds trace reaches separates out NbC, Nb (CN) crystal grain thinning after rolling and improves intensity, the titanium that adds trace is the nitrogen in the steel fixedly, the carbon equivalent Ceq of steel (C+Mn/6) descends 0.10%, improves the welding property of steel; Steel plate is except that having reached the corresponding strength grade, and unit elongation is higher, and through punching test, compared with similar products, steel plate can improve press depth when making end socket, and steel plate has stronger attenuate ability, has good punching performance.
The smelting of gas cylinder steel of the present invention is applicable to various converter operations, adopts common process.The denaturing treatment that the iron calcium line of molten steel feeding 1.0Kg/t.steel is mingled with becomes steel billet through continuous casting.
Adopt the high-temperature zone rolling when rolling, the roughing temperature out is 1070 ℃～1090 ℃ (conventional at 1040 ℃), to guarantee the conventional fully fusion of solute element, reduces the roughing mill load, makes intermediate blank thickness drop to 36mm, reduces the finish rolling load; Finishing temperature is 870 ℃, carries out the quick water-cooled of high temperature; Coil into coil of strip at 580 ℃～620 ℃, prevent grain growth.
The invention has the beneficial effects as follows: the HP325 that produces with domestic steel mill compares, reduced carbon and the manganese content in the steel, add the niobium of trace and the tissue that titanium is strengthened steel, improve the over-all properties of steel plate, the carbon equivalent Ceq of steel (C+Mn/6) descends 0.10%, steel plate shows lower resistance to deformation at high temperature rolling, can be rolling on the 1422mm production line of rolling mill.Adopt aforesaid method, the finished product rate from the base to the material is more than 95%.
Description of drawings:
Fig. 1 is a steel grade grain fineness number photo of the present invention
Fig. 2 is steel grade metallographic structure figure of the present invention
Fig. 1 shows that grain fineness number is the 10-11.5 level, and Fig. 2 shows that the metallographic structure of gas cylinder steel is ferrite+perlite.
The Chemical Composition of the gas cylinder product made from steel of embodiment: embodiment of the invention 1-5 and mechanical property such as table 1 and table 2;
Table 1 test gas cylinder composition of steel
| C％ | Si％ | Mn％ | P％ | S％ | Als％ | Nb％ | Ti％ | N％ |
| 0.0995 0.0966 0.0943 0.0861 0.0872 | 0.042 0.048 0.046 0.044 0.032 | 1.189 1.085 1.048 1.083 1.045 | 0.020 0.016 0.019 0.018 0.015 | 0.0085 0.0086 0.0108 0.0122 0.0118 | 0.0275 0.0197 0.035 0.042 0.052 | 0.018 0.02 0.017 0.017 0.015 | 0.025 0.020 0.014 0.026 0.015 | 0.0057 0.0036 0.0045 0.0040 0.0047 |
The mechanical property of table 2 test gas cylinder steel
| Yield strength MPa | Tensile strength MPa | Elongation % | Clod wash d=2a, 180 ° |
| 450 449 442 459 455 450 | 535 530 525 530 520 510 | 33.5 34 32.5 33 34 35 | Qualified qualified |
Smelting of the present invention and rolling technology are as follows: the smelting of gas cylinder steel of the present invention converts according to proportioning in the table and adopts conventional converter smelting, and wherein ferro-niobium, ferrotianium must add in ladle the back fully at deoxidation of molten steel.Molten steel becomes steel billet in the denaturing treatment that the iron calcium line of external refining station feeding 1.0Kg/t.steel is mingled with through continuous casting.
Adopt the 1422mm production line of rolling mill, adopt the high-temperature zone rolling when rolling, product specification is 3.5mm * 1260mm, and the roughing temperature out is 1070 ℃～1090 ℃, intermediate blank thickness 36mm; F0 frame rolling pressure is 22000KN, and F1 frame rolling pressure is 17000KN, and finishing temperature is 870 ℃, carries out the quick water-cooled of high temperature; Coil into coil of strip at 580 ℃～620 ℃.Gas cylinder steel of the present invention metallographic structure is ferrite+perlite, and grain fineness number is 10～11.5 grades, with reference to Fig. 1,2, and, this product not only has good punching performance, and over-all properties is good, can produce by the relevant criterion tissue substantially.The gas cylinder steel of invention is mainly used in makes the YSP-50 LP gas cylinder.
Claims (2)
1. one kind has the good stamping performance thin gauge gas cylinder steel, its composition weight percent proportioning is: 0.08～0.12%C, ≤ 0.05%Si, 1.00～1.189%Mn ,≤0.025%P, ≤ 0.015%S, 0.010～0.020%Nb, 0.010～0.030%Ti, 0.015～0.060%Al, ≤ 60ppmN, all the other are unavoidable impurities in Fe and the steel.
2. the described a kind of good stamping performance thin gauge gas cylinder steel production method that has of claim 1, at first adopt conventional converter smelting according to proportioning, become steel billet through continuous casting, it is characterized in that: adopt the high-temperature zone rolling when rolling, the roughing temperature out is 1070 ℃～1090 ℃, and intermediate blank thickness is 36mm, and finishing temperature is 870 ℃, carry out the quick water-cooled of high temperature, coil into coil of strip at 580 ℃～620 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100259799A CN100368583C (en) | 2005-05-19 | 2005-05-19 | Thin gauge gas cylinder steel with good stamping performance and process for producing same |
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| CNB2005100259799A CN100368583C (en) | 2005-05-19 | 2005-05-19 | Thin gauge gas cylinder steel with good stamping performance and process for producing same |
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| CN1865480A CN1865480A (en) | 2006-11-22 |
| CN100368583C true CN100368583C (en) | 2008-02-13 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397626B (en) * | 2007-12-07 | 2012-04-11 | 江苏沙钢集团有限公司 | High intensity and high-toughness hot-rolled steel sheet and method for producing the same |
| CN101818309B (en) * | 2010-04-22 | 2012-01-18 | 山西太钢不锈钢股份有限公司 | Manufacturing method of air bottle steel |
| CN103725958A (en) * | 2013-12-26 | 2014-04-16 | 马钢(集团)控股有限公司 | Steel hot rolled plate coil for economical welded gas cylinder and production process thereof |
| CN103643120B (en) * | 2013-12-26 | 2016-04-20 | 马钢(集团)控股有限公司 | The manufacture method of high tenacity welded gas cylinder steel hot-rolled sheet coil |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1112657A (en) * | 1997-06-25 | 1999-01-19 | Sumitomo Metal Ind Ltd | Manufacture of ti added hot rolled high tensile steel plate having excellent formability |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1112657A (en) * | 1997-06-25 | 1999-01-19 | Sumitomo Metal Ind Ltd | Manufacture of ti added hot rolled high tensile steel plate having excellent formability |
Non-Patent Citations (3)
| Title |
|---|
| 梅山自产HP295热轧钢卷轧制工艺研究. 曹璇琛等.钢铁，第37卷增刊卷. 2002 * |
| 焊瓶钢HP325热轧卷板的试制. 赵建伟.冶金丛刊，第5期总第153期. 2004 * |
| 铌钛微合金化汽车大梁用热轧板带BM510L的开发. 万兰凤等.汽车工艺与材料，第4期. 2005 * |
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