CN104109807A - Steel plate used for high-pressure gas cylinder and preparation method thereof - Google Patents
Steel plate used for high-pressure gas cylinder and preparation method thereof Download PDFInfo
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- CN104109807A CN104109807A CN201410322536.5A CN201410322536A CN104109807A CN 104109807 A CN104109807 A CN 104109807A CN 201410322536 A CN201410322536 A CN 201410322536A CN 104109807 A CN104109807 A CN 104109807A
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Abstract
The invention discloses a steel plate used for a high-pressure gas cylinder and a preparation method thereof. The method comprises the steps of carrying out hot continuous rolling on a plate blank and cooling, coiling and insulating the plate blank in sequence and is characterized in that the step of hot continuous rolling comprises the substeps of rough rolling and finish rolling, wherein the initial rolling temperature of rough rolling is 1180-1250 DEG C, the final rolling temperature of rough rolling is 1080-1150 DEG C, the initial rolling temperature of finish rolling is 950-1100 DEG C, and the final rolling temperature of finish rolling is 850-900 DEG C; the cooling condition is as follows: an intermediate plate blank obtained after hot continuous rolling is cooled to the coiling temperature at a cooling rate of 50-250 DEG C/s, the coiling temperature is 50-250 DEG C, the insulating temperature is 500-650 DEG C, and the insulating time is more than 20 hours. The steel plate used for the high-pressure gas cylinder, which has excellent yield strength, tensile strength and low-temperature impact energy, can be provided by the method.
Description
Technical field
The present invention relates to a kind of gas cylinder steel plate and preparation method thereof.
Background technology
Sweet natural gas (CNG) automobile gas cylinder belongs to high pressure vessel, and gas cylinder water detonation pressure is an important indicator of gas cylinder safely design, and it is relevant with the intensity of material.For meeting fracture characteristics and the fracture apperance of the quick-fried test of water, just must make material have rational yield tensile ratio and higher ductility and toughness, these performances not only with the composition of material about, but also relevant with the thermal treatment process of material.
At present, gas cylinder uses Cr-Mo series automobiles gas cylinder high-strength alloy steel mostly with steel plate.But, unstable properties after Cr-Mo series high strength alloy steel heat treatment process window narrows, thermal treatment, the low-temperature impact work of the high-strength alloy steel obtaining is lower, and is difficult to obtain all good gas cylinder steel plates of a kind of yield strength, tensile strength, elongation and low temperature impact merit.
Summary of the invention
The object of the invention is to overcome gas cylinder of the prior art uses the low temperature impact merit of steel plate lower, be difficult to obtain all defects of good gas cylinder steel plate of a kind of yield strength, tensile strength, elongation and low temperature impact merit, all good gas cylinder steel plates and preparation method thereof of a kind of yield strength, tensile strength, elongation and low-temperature impact work are provided.
The invention provides the preparation method of a kind of gas cylinder steel plate, the method comprises: by slab successively through hot continuous rolling, cooling, batch and be incubated, wherein, described hot continuous rolling comprises roughing and finish rolling, described roughing open prick temperature be 1180-1250 DEG C, the whole Zha Wendu of described roughing is 1080-1150 DEG C, described finish rolling open prick temperature be 950-1100 DEG C, the whole Zha Wendu of described finish rolling is 850-900 DEG C; Described cooling condition comprises: the speed of cooling with 50-250 DEG C/s is cooled to the intermediate slab obtaining after hot continuous rolling the temperature of batching; Described temperature of batching is 50-250 DEG C; The temperature of described insulation is 500-650 DEG C, and the time of insulation is more than 20 hours; Consisting of of described slab: C:0.32-0.4 % by weight, Si:0.15-0.35 % by weight, Mn:0.35-0.65 % by weight, Cr:0.95-1.1 % by weight, Mo:0.15-0.25 % by weight, P :≤0.01 % by weight, S :≤0.004 % by weight, H :≤0.0002 % by weight, surplus is iron and inevitable impurity.
The present invention also provides a kind of gas cylinder steel plate obtaining by aforesaid method.
Pass through technique scheme, can obtain that a kind of yield strength reaches that 900MPa is above, tensile strength reaches that 1000MPa is above, elongation reaches more than 14% and ballistic work-50 DEG C time reaches gas cylinder steel plate more than 48J, thereby make this steel plate there is higher safe range of stress and anti-repeatedly impact capacity, low-temperature impact toughness is good, is specially adapted to gas cylinder steel plate.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
Gas cylinder provided by the invention comprises by the preparation method of steel plate: described hot continuous rolling comprises roughing and finish rolling, described roughing open prick temperature be 1180-1250 DEG C, the whole Zha Wendu of described roughing is 1080-1150 DEG C, described finish rolling open prick temperature be 950-1100 DEG C, the whole Zha Wendu of described finish rolling is 850-900 DEG C; Described cooling condition comprises: the speed of cooling with 50-250 DEG C/s is cooled to the intermediate slab obtaining after hot continuous rolling the temperature of batching; Described temperature of batching is 50-250 DEG C; The temperature of described insulation is 500-650 DEG C, and the time of insulation is more than 20 hours; Consisting of of described slab: C:0.32-0.40 % by weight, Si:0.15-0.35 % by weight, Mn:0.35-0.65 % by weight, Cr:0.95-1.1 % by weight, Mo:0.15-0.25 % by weight, P :≤0.01 % by weight, S :≤0.004 % by weight, H :≤0.0002 % by weight, surplus is iron and inevitable impurity.
In the present invention, although just can obtain the good steel plate of better intensity, elongation and low-temperature impact work in the time that the composition of slab is in above-mentioned scope, but in order to strengthen the performance of obtained steel plate, under preferable case, described slab consist of C:0.33-0.38 % by weight, Si:0.2-0.3 % by weight, Mn:0.4-0.6 % by weight, Cr:0.95-1.1 % by weight, Mo:0.15-0.25 % by weight, P :≤0.01 % by weight, S :≤0.004 % by weight, H :≤0.0002 % by weight, surplus is iron and inevitable impurity; In preferred situation, described slab consist of C:0.33-0.37 % by weight, Si:0.21-0.25 % by weight, Mn:0.43-0.56 % by weight, Cr:0.97-1.05 % by weight, Mo:0.22-0.25 % by weight, P :≤0.01 % by weight, S :≤0.004 % by weight, H :≤0.0002 % by weight, surplus is iron and inevitable impurity.The moiety of described slab is in above-mentioned scope time, can through hot continuous rolling of the present invention, cooling, batch with heat preservation method after, make the better steel plate of low-temperature impact work.
In the present invention, described slab can adopt the method for the known continuously cast bloom of this area to be prepared, for example can be by obtaining described continuously cast bloom after blast furnace ironmaking, hot metal pretreatment, converter smelting, steel ladle deoxidation, alloying furnace rear refining, LF electrically heated, RH vacuum-treat and sheet billet continuous casting.The condition of its concrete preparation is well known in the art.
The thickness of described continuously cast bloom can be selected as the case may be, for example, can be 230-250mm.
According to the present invention, in preferred situation, the start rolling temperature of described roughing is 1200-1230 DEG C, and the finishing temperature of described roughing is 1090-1120 DEG C.In addition, the thickness of the intermediate slab after described roughing can suitably be selected according to concrete product to be prepared.Can be for example 40-55mm, be preferably 44-50mm.
In addition, the start rolling temperature of described finish rolling is preferably 990-1020 DEG C, and the finishing temperature of described finish rolling is preferably 860-890 DEG C.The thickness of the intermediate slab after described finish rolling can be 3-15mm, is preferably 6-8mm.
According to the present invention, in order to reach the needed bundle temperature of opening of roughing of hot continuous rolling, can before roughing, first continuously cast bloom be heated in heater to the required bundle temperature of opening when being heated to continuously cast bloom and carrying out roughing.The thickness of the intermediate slab obtaining after described hot continuous rolling is the thickness of the intermediate slab after the described finish rolling here, and after referring to after described hot continuous rolling that finish rolling completes.
According to the present invention, the intermediate slab after finish rolling to be carried out coolingly after hot continuous rolling, under preferable case, described cooling condition comprises: the speed of cooling with 50-150 DEG C/s is cooled to the intermediate slab obtaining after hot continuous rolling the temperature of batching; More preferably, described cooling condition comprises: the speed of cooling with 55-125 DEG C/s is cooled to the intermediate slab obtaining after hot continuous rolling the temperature of batching.Described cooling can being undertaken by laminar flow water.
According to the present invention, in order to make the temperature of cooled intermediate slab more balanced, preferably, after the intermediate slab obtaining after hot continuous rolling is cooled to the temperature of batching and before batching, cooled intermediate slab is carried out to air cooling.The time of described air cooling can 8-22s, is preferably 10-20s.
According to the present invention, in preferred situation, described in the temperature of batching be 60-240 DEG C.
According to the present invention, in preferred situation, the temperature of described insulation is 550-650 DEG C, and the time of insulation is 24-48 hour.More preferably the temperature of described insulation is 580-625 DEG C, and the time of insulation is 24-30 hour.By the slab after batching being incubated under this heat-retaining condition, there is the effect of obdurability good match.
The present invention also provides the gas cylinder of preparing by above-mentioned preparation method steel plate.
The yield strength R of steel plate for gas cylinder provided by the invention
eLreach that 900MPa is above, tensile strength R
mreach that 1000MPa is above, elongation A
80reach more than 14%, and more than ballistic work-50 DEG C time reaches 48J, there is good mechanical property.
Embodiment
Below will describe the present invention by embodiment.
Yield strength ReL, tensile strength Rm in following examples and comparative example, the testing method of elongation A80 are carried out according to GB/T228-2002 metallic substance tensile testing at ambient temperature; The method specifying according to GB/T232-2010 detects cold-bending property (B=35, α=180 °, d=a; D represents that Bend diameter, a represent that sample thickness, α represent that bending angle, B represent the width of sample).Ballistic work (A-50 DEG C time
kv) detection method be GB/T229-2007.
Embodiment 1-3
Converter smelting, through LF stove Ca process, RH decarburization and continuous casting obtain continuously cast bloom of the present invention (thickness is 230mm), its moiety is in table 1.This continuous casting steel billet is heated to opening of roughing in process furnace to be pricked temperature and enters reversible roughing unit, intermediate blank after roughing enters Coil Box, make to be with steel toe, tail to be exchanged, then carry out finish rolling, after finish rolling and according to the speed of cooling of specifying, be quickly cooled to the laggard line space of coiling temperature cold, then batch, the steel plate after batching is incubated to (hot continuous rolling process, process for cooling and heat-retaining condition carry out according to the condition in table 2), obtain gas cylinder steel plate.The gas cylinder obtaining by the mechanical property of steel plate in table 3.
Comparative example 1
Carry out according to the method for embodiment 1, different, the moiety of continuously cast bloom different from embodiment (specifically in tables 1), obtains gas cylinder steel plate.The gas cylinder obtaining by the mechanical property of steel plate in table 3.
Comparative example 2
According to the method described in embodiment 1, different, speed of cooling is 45 DEG C/s, obtains gas cylinder steel plate.The gas cylinder obtaining by the mechanical property of steel plate in table 3.
Comparative example 3
According to the method described in embodiment 1, different, holding temperature is 530 DEG C, obtains gas cylinder steel plate.The gas cylinder obtaining by the mechanical property of steel plate in table 3.
Table 1
Table 2
Table 3
Note: qualified referring to after pliability test, visual inspection sample crooked outer surface is intact without visible crack.
Known by above-described embodiment, the yield strength ReL>=900MPa of steel plate for the gas cylinder obtaining by the application's method, tensile strength Rm>=1000MPa, elongation A
80ballistic work>=48J while being greater than 14% ,-50 DEG C, that is to say by method of the present invention and can obtain all good gas cylinder steel plates of yield strength, tensile strength, elongation and low-temperature impact work.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. the preparation method of steel plate for gas cylinder, the method comprises: by slab successively through hot continuous rolling, cooling, batch and be incubated, it is characterized in that,
Described hot continuous rolling comprises roughing and finish rolling, described roughing open prick temperature be 1180-1250 DEG C, the whole Zha Wendu of described roughing is 1080-1150 DEG C, described finish rolling open prick temperature be 950-1100 DEG C, the whole Zha Wendu of described finish rolling is 850-900 DEG C;
Described cooling condition comprises: the speed of cooling with 50-250 DEG C/s is cooled to the intermediate slab obtaining after hot continuous rolling the temperature of batching;
Described temperature of batching is 50-250 DEG C;
The temperature of described insulation is 500-650 DEG C, and the time of insulation is more than 20 hours;
Consisting of of described slab: the consisting of of described slab: C:0.32-0.40 % by weight, Si:0.15-0.35 % by weight, Mn:0.35-0.65 % by weight, Cr:0.95-1.1 % by weight, Mo:0.15-0.25 % by weight, P :≤0.01 % by weight, S :≤0.004 % by weight, H :≤0.0002 % by weight, surplus is iron and inevitable impurity.
2. method according to claim 1, wherein, the start rolling temperature of described roughing is 1200-1230 DEG C, and the finishing temperature of described roughing is 1090-1120 DEG C, and the start rolling temperature of described finish rolling is 990-1020 DEG C, and the finishing temperature of described finish rolling is 860-890 DEG C.
3. method according to claim 1, wherein, described cooling condition comprises: the speed of cooling with 55-125 DEG C/s is cooled to the intermediate slab obtaining after hot continuous rolling the temperature of batching.
4. according to the method described in claim 1 or 3, wherein, the method also comprises, after the intermediate slab obtaining after hot continuous rolling is cooled to the temperature of batching and before batching, by cooled intermediate slab air cooling 8-22s.
5. method according to claim 4, wherein, after the intermediate slab obtaining after hot continuous rolling is cooled to the temperature of batching and before batching, by cooled intermediate slab air cooling 10-20s.
6. according to the preparation method described in any one in claim 1-3, wherein, described in the temperature of batching be 60-240 DEG C.
7. method according to claim 1, wherein, the temperature of described insulation is 550-650 DEG C, the time of insulation is 24-48 hour.
8. method according to claim 1, wherein, described slab consist of C:0.33-0.38 % by weight, Si:0.2-0.3 % by weight, Mn:0.4-0.6 % by weight, Cr:0.95-1.1 % by weight, Mo:0.15-0.25 % by weight, P :≤0.01 % by weight, S :≤0.004 % by weight, H :≤0.0002 % by weight, surplus is iron and inevitable impurity.
9. the gas cylinder steel plate of preparing according to the preparation method described in any one in claim 1-8.
10. gas cylinder steel plate according to claim 9, wherein, the yield strength ReL>=900MPa of steel plate for described gas cylinder, tensile strength Rm>=1000MPa, elongation A
80ballistic work>=48J>=14% ,-50 DEG C time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177427A (en) * | 2015-10-21 | 2015-12-23 | 攀钢集团西昌钢钒有限公司 | Steel for 30CrMo gas cylinders and production method thereof |
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| CN101956135A (en) * | 2010-09-23 | 2011-01-26 | 舞阳钢铁有限责任公司 | Medium carbon alloy high-strength quenched and tempered steel plate and production method thereof |
| CN102268600A (en) * | 2011-07-29 | 2011-12-07 | 攀钢集团有限公司 | Automobile compressed natural gas (CNG) bottle steel and production method thereof |
| CN103255341A (en) * | 2013-05-17 | 2013-08-21 | 宝山钢铁股份有限公司 | High-strength and high-toughness hot-rolled wear-resistant steel and preparation method thereof |
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| CN101956135A (en) * | 2010-09-23 | 2011-01-26 | 舞阳钢铁有限责任公司 | Medium carbon alloy high-strength quenched and tempered steel plate and production method thereof |
| CN102268600A (en) * | 2011-07-29 | 2011-12-07 | 攀钢集团有限公司 | Automobile compressed natural gas (CNG) bottle steel and production method thereof |
| CN103255341A (en) * | 2013-05-17 | 2013-08-21 | 宝山钢铁股份有限公司 | High-strength and high-toughness hot-rolled wear-resistant steel and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105177427A (en) * | 2015-10-21 | 2015-12-23 | 攀钢集团西昌钢钒有限公司 | Steel for 30CrMo gas cylinders and production method thereof |
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Effective date of registration: 20230927 Address after: 617000 Taoyuan street, East District, Panzhihua, Sichuan Province, No. 90 Patentee after: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE Co.,Ltd. Patentee after: Chengdu advanced metal material industry technology Research Institute Co.,Ltd. Address before: 617000 Taoyuan street, East District, Panzhihua, Sichuan Province, No. 90 Patentee before: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE Co.,Ltd. |