CN103643116A - Welding gas cylinder and manufacturing technology of hot rolled steel plate of welding gas bottle - Google Patents
Welding gas cylinder and manufacturing technology of hot rolled steel plate of welding gas bottle Download PDFInfo
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Abstract
The invention discloses a manufacturing technology of a hot rolled steel plate of a welding gas cylinder. The manufacturing technology sequentially comprises the steps of steelmaking, continuous casting, heating of a continuous casting billet, hot rolling and reeling, wherein in the steelmaking step, the content of S in molten steel is controlled to be less than or equal to 0.015%, the content of Si in the molten steel is controlled to be less than or equal to 0.10%, and then Ca treatment is carried out; the molten steel comprises the following chemical components by weight percent: 0.13-0.18% of C, less than or equal to 0.10% of Si, 0.70-1.10% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.015-0.10% of Als, 0.01-0.02% of Ti and the balance being Fe and unavoidable impurities; in the step of heating the continuous casting billet, the temperature of a preheating section is controlled to be less than or equal to 1000 DEG C, the temperature of a heating section is controlled to be 1320-1340 DEG C, the temperature of a soaking zone is controlled to be 1300-1320 DEG C, and the tapping temperature is controlled to be 1200-1250 DEG C; in the step of hot rolling, the temperature of a finish rolling inlet is controlled to be 950-1050 DEG C, and the temperature of a finish rolling outlet is controlled to be 840-890 DEG C; in the step of reeling, when the carbon content of steel is 0.13-0.15%, the reeling temperature is controlled to be 610-630 DEG C; when the content of carbon in the steel is 0.16-0.18%, the reeling temperature is controlled to be 640-660 DEG C.
Description
Technical field
The present invention relates to engineering materials technical field, more particularly, relate to welded gas cylinder that a kind of Volume variation rate is high and the manufacturing process of hot-rolled steel sheet thereof.
Background technology
Along with the development of China Petroleum and the raising day by day of living standards of the people, household bottled liquefied petroleum gas extensively enters town and country huge numbers of families, wherein, YSP-l5 type liquefied petroleum gas steel cylinder more than 80% be the welded gas cylinder of being made by HP295 hot-rolled steel sheet.Welded gas cylinder belongs to two class pressurized vessels, the fine or not direct relation of its performance user's safety, therefore, national standard has been carried out strict regulation to the properties of welded gas cylinder, the welded gas cylinder of making of HP295 hot-rolled steel sheet is except meeting desired every mechanical property, and welded gas cylinder also needs to carry out that strict sampling observation hydraulic bursting test is qualified just can put on market afterwards.When welded gas cylinder carries out the water test, the volume gain amount of gas cylinder and the ratio of testing the water capacity of front gas cylinder when Volume variation rate when it breaks refers to explosion.
This be because, the welded gas cylinder that fills liquefied petroleum gas (LPG) is general use at the restaurant with the hot environment such as kitchen in, when welded gas cylinder in use runs into high temperature, pressure of the inside of a bottle can raise, if the volume of gas cylinder is less than standard value, its distortion allowance is little, the accident of easily blasting, therefore require welded gas cylinder to carry out hydraulic bursting test and Volume variation rate need be greater than 10%, to guarantee that welded gas cylinder has enough safety reservations.
At present, the document that welding gas cylinder volume deformation rate is studied is less, it in prior art, is mainly the Volume variation rate that suitable length-to-diameter ratio scope improves steel cylinder of how choosing from structural shape aspect, or research thermal treatment and the impact of material hardness on cylinder for liquefied gas Volume variation rate, do not relate to the technology that improves welded gas cylinder Volume variation rate by improving the manufacturing process of hot-rolled steel sheet.
Summary of the invention
For the deficiencies in the prior art, one of object of the present invention is to solve the one or more problems that exist in above-mentioned prior art.
The object of the present invention is to provide and a kind ofly by improving the performance of hot-rolled steel sheet, improve the method for welded gas cylinder Volume variation rate and a kind of welded gas cylinder with high volume deformation rate is provided
To achieve these goals, one aspect of the present invention provides a kind of manufacturing process of hot-rolled steel plates for welded gas cylinder, described manufacturing process comprises the steel-making of carrying out successively, continuous casting, add hot continuously cast material, hot rolling, batch, wherein, in the step of steel-making, control S content≤0.015% in molten steel, Si content≤0.10% also carries out Ca processing, wherein, by weight percentage, the chemical composition of gained molten steel is C:0.13～0.18%, Si≤0.10%, Mn:0.70～1.10%, P≤0.020%, S≤0.015%, Als:0.015～0.10%, the Fe of Ti:0.01～0.02% and surplus and inevitably impurity, in adding the step of hot continuously cast material, controlling preheating section temperature≤1000 ℃, heating zone temperature and be 1320～1340 ℃, soaking zone temperature and be 1300～1320 ℃, tapping temperature is 1200～1250 ℃, in the step of hot rolling, controlling finish rolling temperature in is 950～1050 ℃, and finish rolling temperature out is 840～890 ℃, in the step of batching, when the carbon content of steel is 0.13～0.15%, controlling coiling temperature is 610～630 ℃, when the carbon content of steel is 0.16～0.18%, controlling coiling temperature is 640～660 ℃.
According to the manufacturing process of hot-rolled steel plates for welded gas cylinder of the present invention embodiment, in the step of steel-making, by feeding Ca-Fe cored-wire, carry out Ca processing.
According to the manufacturing process of hot-rolled steel plates for welded gas cylinder of the present invention embodiment, the thickness of described hot-rolled steel sheet is 3～3.5mm.
According to the manufacturing process of hot-rolled steel plates for welded gas cylinder of the present invention embodiment, unit elongation >=30% of described hot-rolled steel sheet, relative reduction in area >=60%.
The present invention also provides a kind of welded gas cylinder, and described welded gas cylinder is processed by the hot-rolled steel sheet of the manufacturing process manufacture of the hot-rolled steel plates for welded gas cylinder described in above-mentioned any one.
According to welded gas cylinder of the present invention embodiment, the Volume variation rate of described welded gas cylinder is greater than 15%.
The present invention, by controlling converter steelmaking process, makes the Sulfide inclusion of hot-rolled steel sheet and silicate inclusion be spherical or short strip shape distribution; Heating temperature, finish rolling temperature in and finish rolling temperature out during simultaneously by control hot rolling, and the coiling temperature under different carbon content, make the hot-rolled steel sheet of 3.0～3.5mm thickness have higher unit elongation and relative reduction in area.And the welded gas cylinder that the hot-rolled steel sheet of producing by method of the present invention is made has higher Volume variation rate, has improved welded gas cylinder security in actual use.
Embodiment
Hereinafter, in connection with exemplary embodiment, describe the manufacturing process of hot-rolled steel plates for welded gas cylinder of the present invention in detail.In the present invention, if there is no the statement of exception, related per-cent is mass percent.
In prior art; when the welded gas cylinder that hot-rolled steel sheet is made is inspected hydraulic bursting test by random samples; the situation that often there will be the Volume variation rate < 10% of welded gas cylinder; if the Volume variation rate of welded gas cylinder does not reach the standard-required that is greater than 10%; this batch of gas cylinder is judged to defective; therefore use be can not put on market, material, artificial etc. waste caused.Breaking while carrying out hydraulic bursting test due to welded gas cylinder is generally ductile fracture, and one of principal character of ductile fracture is that before breaking, material and structure will produce larger viscous deformation, the present invention is just based on this point discovery, provide a kind of by improving the converter smelting of hot-rolled steel sheet and the method for hot rolling production technique, reach and improve the unit elongation of hot-rolled steel sheet and the object of relative reduction in area, and further guarantee that gas cylinder has enough plasticity storages, thereby guarantee that the Volume variation rate of the welded gas cylinder that hot-rolled steel sheet is made reaches more than 15%.
According to an exemplary embodiment of the present invention the manufacturing process of hot-rolled steel plates for welded gas cylinder comprise the steel-making, the continuous casting that carry out successively, add hot continuously cast material, hot rolling, the step of batching.The present invention is mainly in steel-making, add hot continuously cast material, hot rolling, improve in the step such as batching, specific as follows:
First, in the step of converter steelmaking, control the S content in molten steel, and S content is controlled at below 0.015%, to reduce steel medium sulphide content, be mingled with.Control Si content in molten steel below 0.10%, to reduce strip Silicate Inclusions in steel simultaneously.And in the process of LF stove steel-making, molten steel is carried out to Ca processing, so that the strip sulfide inclusion in steel becomes the inclusion of spherical or short strip shape, preferably, by feeding Ca-Fe cored-wire, carry out Ca processing.And, by weight percentage, the chemical composition of smelting gained molten steel is Fe and the inevitable impurity of C:0.13～0.18%, Si≤0.10%, Mn:0.70～1.10%, P≤0.020%, S≤0.015%, Als:0.015～0.10%, Ti:0.01～0.02% and surplus.
Because steel medium sulphide content is mingled with the form of Silicate Inclusions and size greatlyr on the unit elongation of steel plate and relative reduction in area impact, and then affect the viscous deformation of hot-rolled steel sheet and welded gas cylinder.If the S content in steel and Si content are higher, the strip sulfide inclusion of the distribution that focuses mostly on existing in steel and Silicate Inclusions will be cut apart steel matrix and destroy the continuity of steel matrix, to have a strong impact on plasticity and the toughness of steel plate, and then reduce unit elongation and the relative reduction in area of steel plate.When welded gas cylinder generation viscous deformation that hot-rolled steel sheet is made, microvoid will be sprouted by surrounding at strip inclusion, increase along with gas cylinder deflection, microvoid will be expanded gradually, if the strip sulfide inclusion in steel plate and strip Silicate Inclusions are more, microvoid will couple together and make to be mingled with and be strip and distribute, and finally cause gas cylinder cracking.Therefore, according to the present invention, to control the Si content in steel on the one hand, reduce the quantity that steel mesosilicic acid salt is mingled with, to control on the other hand the S content in steel simultaneously, reduce the quantity that steel medium sulphide content is mingled with, and will when steel-making, to molten steel, carry out calcium processing, make the strip sulfide in steel become spherical inclusion.Preferably, adopt Ca-Fe cored-wire to carry out calcium processing, and avoid adopting Ca-Si cored-wire to carry out calcium processing to molten steel, in order to avoid improve the Si content in steel, the consequence that causes steel mesosilicic acid salt to increase.
Afterwards, in adding the step of hot continuously cast material, controlling preheating section temperature≤1000 ℃, heating zone temperature and be 1320～1340 ℃, soaking zone temperature and be 1300～1320 ℃, tapping temperature is 1200～1250 ℃.In the step of hot rolling, controlling finish rolling temperature in is 950～1050 ℃, and finish rolling temperature out is 840～890 ℃.In the step of batching, when the carbon content of steel is 0.13～0.15%, controlling coiling temperature is 610～630 ℃; When the carbon content of steel is 0.16～0.18%, controlling coiling temperature is 640～660 ℃.
Because hot rolling Heating temperature, finish rolling entrance and exit temperature, coiling temperature have larger impact to the unit elongation of steel plate and relative reduction in area, therefore the present invention, by controlling preheating section temperature≤1000 ℃, 1320～1340 ℃ of heating zone temperature, 1300～1320 ℃ of soaking zone temperature when hot rolling, be take and guaranteed that tapping temperature is as 1200～1250 ℃.If 1250 ℃ of tapping temperature >, easily cause steel plate coarse microstructure, reduce unit elongation and the relative reduction in area of steel plate, if 1200 ℃ of tapping temperature <, easily cause steel plate heating inhomogeneous, finally cause plate property inhomogeneous.
By controlling finish rolling temperature in, be 950～1050 ℃, finish rolling temperature out is 840～890 ℃, guaranteeing that hot-rolled steel sheet has on the basis of intensity index of regulation, also makes it have good plasticity index, has higher unit elongation and relative reduction in area.
And, when batching steel plate, should suitably control coiling temperature according to the carbon content of steel, if do not consider the carbon content of steel, do not take single coiling temperature scope, can cause the mechanical property of steel plate not mated.Particularly, if coiling temperature is controlled, be 610～630 ℃,, when the carbon content of steel is 0.13～0.15%, when guaranteeing that steel plate has the intensity of standard-required, steel plate has higher unit elongation and relative reduction in area; But when the carbon content of steel is 0.16～0.18%, if coiling temperature is still controlled, be 610～630 ℃, the amplitude that intensity of steel plate improves is larger, but while unit elongation and relative reduction in area will significantly reduce.If when coiling temperature control is 640～660 ℃, when the carbon content of steel is 0.16～0.18%,, when guaranteeing that steel plate has the intensity of standard-required, steel plate has higher unit elongation and relative reduction in area; But when the carbon content of steel is 0.13～0.15%, if coiling temperature is still controlled, be 640～660 ℃, although steel plate can have higher unit elongation and relative reduction in area, the intensity of steel plate can not reach the standard-required of gas cylinder steel plate.Therefore, coiler plate temperature that need to be different according to different steel carbon content controls, to obtain the optimum matching of hot-rolled steel sheet mechanical property.
By above method, produce the hot-rolled steel plates for welded gas cylinder of 3.0～3.5mm thickness, there is higher unit elongation and relative reduction in area.According to one embodiment of present invention, unit elongation >=30% of prepared hot-rolled steel plates for welded gas cylinder, relative reduction in area >=60%.
Welded gas cylinder of the present invention is that the hot-rolled steel sheet by the manufacturing process manufacture of above-mentioned hot-rolled steel plates for welded gas cylinder processes, and its Volume variation rate is greater than 15%.
Below by concrete example, describe the present invention in detail.
Example 1 to 9 all utilizes the manufacturing process of above hot-rolled steel plates for welded gas cylinder to manufacture hot-rolled steel sheet, wherein, during converter steelmaking, control S content≤0.015% in molten steel, Ca-Fe cored-wire at LF stove to every stove steel feeding 800m, control Si content≤0.10% in molten steel simultaneously, the molten steel composition of smelting gained in each example is as shown in table 1, heating in each example, hot rolling, the temperature control parameter of technique and the unit elongation of each example gained hot-rolled steel sheet such as batch, end face shrinking percentage and adopt the Volume variation rate result of the welded gas cylinder that this hot-rolled steel sheet makes as shown in table 2.
Molten steel composition/the % of table 1 example 1 to 9
| Sequence number | C | Si | Mn | P | S | Als | Ti |
| 1 | 0.13 | 0.08 | 0.95 | 0.018 | 0.014 | 0.020 | 0.02 |
| 2 | 0.15 | 0.07 | 0.85 | 0.015 | 0.010 | 0.026 | 0.01 |
| 3 | 0.18 | 0.06 | 0.75 | 0.013 | 0.010 | 0.025 | 0.02 |
| 4 | 0.14 | 0.05 | 0.90 | 0.010 | 0.008 | 0.030 | 0.02 |
| 5 | 0.16 | 0.07 | 1.00 | 0.009 | 0.007 | 0.030 | 0.01 |
| 6 | 0.18 | 0.05 | 0.95 | 0.012 | 0.006 | 0.040 | 0.01 |
| 7 | 0.13 | 0.06 | 1.10 | 0.009 | 0.005 | 0.035 | 0.02 |
| 8 | 0.14 | 0.08 | 0.97 | 0.010 | 0.008 | 0.028 | 0.02 |
| 9 | 0.16 | 0.05 | 1.10 | 0.014 | 0.009 | 0.040 | 0.01 |
Control parameter and product performance in table 2 example 1 to 9
As shown in table 2, the unit elongation of hot-rolled steel sheet that adopts the manufacturing process gained of hot-rolled steel plates for welded gas cylinder of the present invention is 32～40%, relative reduction in area is 64～71%.Adopting the Volume variation rate of the welded gas cylinder of this hot-rolled steel sheet manufacture is 18～30%, far above national standard.
Therefore, adopt the hot-rolled steel sheet of the fabrication process of hot-rolled steel plates for welded gas cylinder of the present invention, when guaranteeing its tensile strength and yield strength, make it have higher plasticity, there is higher unit elongation and relative reduction in area; And the welded gas cylinder that adopts this hot-rolled steel sheet to make has higher Volume variation rate, improved on the one hand the lumber recovery of hot-rolled steel sheet, the security that has improved on the other hand welded gas cylinder.
Although specifically described the present invention, those skilled in the art will appreciate that without departing from the spirit and scope of the present invention, can make various forms of changes to the present invention.
Claims (6)
1. a manufacturing process for hot-rolled steel plates for welded gas cylinder, is characterized in that, described manufacturing process comprises the steel-making, the continuous casting that carry out successively, adds hot continuously cast material, hot rolling, batches, wherein,
In the step of steel-making, control S content≤0.015%, Si content≤0.10% in molten steel and carry out Ca processing, wherein, by weight percentage, the chemical composition of gained molten steel is Fe and the inevitable impurity of C:0.13～0.18%, Si≤0.10%, Mn:0.70～1.10%, P≤0.020%, S≤0.015%, Als:0.015～0.10%, Ti:0.01～0.02% and surplus;
In adding the step of hot continuously cast material, controlling preheating section temperature≤1000 ℃, heating zone temperature and be 1320～1340 ℃, soaking zone temperature and be 1300～1320 ℃, tapping temperature is 1200～1250 ℃;
In the step of hot rolling, controlling finish rolling temperature in is 950～1050 ℃, and finish rolling temperature out is 840～890 ℃;
In the step of batching, when the carbon content of steel is 0.13～0.15%, controlling coiling temperature is 610～630 ℃; When the carbon content of steel is 0.16～0.18%, controlling coiling temperature is 640～660 ℃.
2. the manufacturing process of hot-rolled steel plates for welded gas cylinder according to claim 1, is characterized in that, in the step of steel-making, by feeding Ca-Fe cored-wire, carries out Ca processing.
3. the manufacturing process of hot-rolled steel plates for welded gas cylinder according to claim 1, is characterized in that, the thickness of described hot-rolled steel sheet is 3～3.5mm.
4. the manufacturing process of hot-rolled steel plates for welded gas cylinder according to claim 1, is characterized in that, unit elongation >=30% of described hot-rolled steel sheet, relative reduction in area >=60%.
5. a welded gas cylinder, is characterized in that, described welded gas cylinder is processed by the hot-rolled steel sheet of the manufacturing process manufacture of the hot-rolled steel plates for welded gas cylinder described in any one in claim 1 to 4.
6. welded gas cylinder according to claim 5, is characterized in that, the Volume variation rate of described welded gas cylinder is greater than 15%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518093A (en) * | 2018-12-17 | 2019-03-26 | 包头钢铁（集团）有限责任公司 | A kind of civilian gas cylinder hot rolled strip and preparation method thereof |
| CN109855982A (en) * | 2019-01-21 | 2019-06-07 | 中国石油天然气集团有限公司 | A kind of liquefied petroleum gas cylinder explosion test device and test method |
| CN110732552A (en) * | 2019-10-23 | 2020-01-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for heating high-strength hot-rolled steel sheet |
| CN114196889A (en) * | 2021-11-29 | 2022-03-18 | 湖南华菱涟源钢铁有限公司 | Hot-rolled steel sheet material, method for producing same and product |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445858A (en) * | 2008-12-30 | 2009-06-03 | 攀钢集团研究院有限公司 | Method for treating inclusions in hot-rolled steel plates for welded gas cylinder |
| CN102071355A (en) * | 2011-01-27 | 2011-05-25 | 河北钢铁股份有限公司唐山分公司 | Steel for liquefied petroleum gas cylinders produced by continuous casting and rolling of medium and thin slabs and production method thereof |
| CN102191438A (en) * | 2010-03-18 | 2011-09-21 | 宝山钢铁股份有限公司 | Steel plate for seamless high pressure gas cylinder, and manufacture method thereof |
-
2013
- 2013-11-27 CN CN201310612964.7A patent/CN103643116B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445858A (en) * | 2008-12-30 | 2009-06-03 | 攀钢集团研究院有限公司 | Method for treating inclusions in hot-rolled steel plates for welded gas cylinder |
| CN102191438A (en) * | 2010-03-18 | 2011-09-21 | 宝山钢铁股份有限公司 | Steel plate for seamless high pressure gas cylinder, and manufacture method thereof |
| CN102071355A (en) * | 2011-01-27 | 2011-05-25 | 河北钢铁股份有限公司唐山分公司 | Steel for liquefied petroleum gas cylinders produced by continuous casting and rolling of medium and thin slabs and production method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518093A (en) * | 2018-12-17 | 2019-03-26 | 包头钢铁（集团）有限责任公司 | A kind of civilian gas cylinder hot rolled strip and preparation method thereof |
| CN109855982A (en) * | 2019-01-21 | 2019-06-07 | 中国石油天然气集团有限公司 | A kind of liquefied petroleum gas cylinder explosion test device and test method |
| CN110732552A (en) * | 2019-10-23 | 2020-01-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for heating high-strength hot-rolled steel sheet |
| CN114196889A (en) * | 2021-11-29 | 2022-03-18 | 湖南华菱涟源钢铁有限公司 | Hot-rolled steel sheet material, method for producing same and product |
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