CN103074544A - Cr-Mo-RE low-alloy seamless steel pipe for high-pressure boiler and manufacturing method of pipe - Google Patents
Cr-Mo-RE low-alloy seamless steel pipe for high-pressure boiler and manufacturing method of pipe Download PDFInfo
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Abstract
The invention discloses a Cr-Mo-RE (Rare Earth) low-alloy seamless steel pipe for a high-pressure boiler. The pipe comprises the following chemical components by mass percent: 0.05% -0.15% of C, 0.25% -0.50% of Si, 0.30% -0.60% of Mn, 0.8% -1.5% of Cr, 0.8% -1.0% of Mo, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.04% of Al, 0.018% -0.022% of RE, and the balance of Fe and impurities, wherein the total mass percent is 100%. The invention further discloses a manufacturing method of the Cr-Mo-RE low-alloy seamless steel pipe for the high-pressure boiler. The pipe produced by the method has good high-temperature resistance and mechanical properties; the life cycle of the pipe is increased; and the safety of the pipe is improved.
Description
Technical field
The present invention relates to a kind of manufacturing technology of weldless steel tube, specifically, relate to a kind of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube and manufacture method thereof.
Background technology
Along with the continuous increase of the shared industrial pipe market share of seamless tube, the seamless tube development that is applied under the varying environment also gos deep into year by year.The development of the effective high temperature steel of high-duty boiler originates in the '30s in last century.Beginning is owing to service temperature lower (≤450 ℃), and requirement of strength is not high, generally adopts some soft steel (such as 10#, 20# highquality carbon steel).Development along with power industry, the needs that improve constantly in order to adapt to the Boiler Steam parameter, soft steel can not satisfy performance requriements, begun to occur to contain the low-alloy Refractory Steel of Mo, its use temperature is in 450 ℃ to 520 ℃ temperature ranges, its creep rupture strength is than the high 1.5-2.0 of 20# steel times, and the development that can say the Mo steel is the source of low-alloy Refractory Steel development in modern age.After this develop again Cr-Mo system, Cr-Mo-V series low-alloy high temperature steel and be used for high Cr (containing Cr:9-12%) steel and the superalloy of ultra supercritical station boiler unit.
As everyone knows, rare earth adds in the steel in right amount as alloying element, can cleaning molten steel, make harmful effects such as sex change and deoxidation alloying that are mingled with, improve steel comprehensive mechanical property, corrosion resistance, antioxidant property and thermotolerance.So be to add trace rare-earth in the steel alloy at Cr-Mo, replace a part of Cr to reduce the alloy total amount and reach the purpose that improves the material at high temperature mechanical property.Improving its over-all properties with the reduction material cost is very significant as the invention starting point.
Summary of the invention
Technical problem solved by the invention provides a kind of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube, and tubing has good high temperature resistant mechanical property, has improved life cycle and the safety performance of tubing.
Technical scheme is as follows:
A kind of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube, tubing comprises according to the chemical ingredients of mass percent: C0.05～0.15, Si0.25～0.50, Mn0.30～0.60, Cr0.8～1.5, Mo0.8～1.0, P≤0.025, S≤0.025, Al≤0.04, rare earth RE0.018～0.022, all the other are Fe and are mingled with that massfraction amounts to 100%.
Further: in the chemical ingredients of tubing according to mass percent, C is that 0.11, Si is that 0.30, Mn is that 0.36, Cr is that 1.0, Mo is that 0.8, P is that 0.014, S is that 0.004, Al is that 0.02, RE is 0.01.
Further: in the chemical ingredients of tubing according to mass percent, C is that 0.13, Si is that 0.31, Mn is that 0.32, Cr is that 1.2, Mo is that 0.6, P is that 0.016, S is that 0.003, Al is that 0.03, RE is 0.02.
Further: in the chemical ingredients according to mass percent, C is that 0.12, Si is that 0.38, Mn is that 0.33, Cr is that 0.9, Mo is that 1.0, P is that 0.014, S is that 0.002, Al is that 0.04, RE is 0.03.
Another technical problem solved by the invention provides a kind of manufacture method of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube, and the tubing of production has good high temperature resistant mechanical property, has improved life cycle and the safety performance of tubing.
Technical scheme is as follows:
A kind of manufacture method of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube forms weldless steel tube after material smelting and two steps of weldless steel tube hot continuous rolling, weldless steel tube tubing is according to the chemical ingredients of mass percent, comprise: C0.05～0.15, Si0.25～0.50, Mn0.30～0.60, Cr0.8～1.5, Mo0.8～1.0, P≤0.025, S≤0.025, Al≤0.04, rare earth RE0.018～0.022, all the other are Fe and are mingled with that massfraction amounts to 100%.
Further: the step that material is smelted comprises that blast-melted smelting, converter smelting, liquid steel refining and continuous casting of molten steel form round steel billet; Wherein, in the converter smelting, molten iron after pretreatment enters converter, and oxygen decarburization heats up, and smelts later stage adding ferrosilicon, ferromanganese, ferrochrome and molybdenum-iron deoxidation alloying, and control P and S composition prevent the molten steel peroxidation, 1600～1630 ℃ of tapping temperatures; Liquid steel refining adopts the omnidistance gon technics of ladle refining furnace LF+ vacuum degassing furnace VD, evenly adds in batches C powder and Si powder in the refining process, and abundant reduction keeps reducing atmosphere, adopts the deoxidation of Al silk, and the later stage adopts rare earth hello a silk technology to make RE alloyed; Enter the VD stokehold, temperature is 1610 ~ 1630 ℃, w[S]≤0.007%; LF stove refining time is controlled at 45-60 minute, carries out first thermometric after entering VD stove seat bag, temperature is controlled at 〉=1620 ℃, then advances the VD stove evacuation, vacuum tightness≤0.10KPa, dark vacuum time 〉=15min; Continuous casting of molten steel forms in the steel billet process, and molten steel advances middle bag temperature and is controlled at 1550-1580 ℃, superheating temperature Δ T≤30 ℃, and pulling rate is controlled at 0.65-0.75m/min, straightening temperature 〉=950 ℃.
Further: in the weldless steel tube during Hot Strip Rolling, steel billet adopts the ring furnace heating, after heating is finished, enters the conic perforator perforation, and temperature is 1200～1260 ℃ during its circle base perforation; Employing was little after perforation was finished draws steel rolling rolling, and temperature is 1050～1150 ℃ during tube rolling; Enter reheating furnace heating by the stretch-reducing mill wroughtsteel pipe to final size, fixed temperature when subtracting is 820～900 ℃, forms at last Cr-Mo-RE low-alloy high-duty boiler weldless steel tube.
Further: in the chemical ingredients of tubing according to mass percent, C is that 0.11, Si is that 0.30, Mn is that 0.36, Cr is that 1.0, Mo is that 0.8, P is that 0.014, S is that 0.004, Al is that 0.02, RE is 0.01.
Further: in the chemical ingredients of tubing according to mass percent, C is that 0.13, Si is that 0.31, Mn is that 0.32, Cr is that 1.2, Mo is that 0.6, P is that 0.016, S is that 0.003, Al is that 0.03, RE is 0.02.
Further: in the chemical ingredients according to mass percent, C is that 0.12, Si is that 0.38, Mn is that 0.33, Cr is that 0.9, Mo is that 1.0, P is that 0.014, S is that 0.002, Al is that 0.04, RE is 0.03.
Technique effect comprises:
The present invention is to add trace rare-earth in the steel alloy at Cr-Mo, forms Cr-Mo-RE low-alloy high pressure boiler tube, satisfies to greatest extent the demand that the Boiler Steam parameter improves constantly.Under severe service condition, tubing has good strength, toughness and mechanical property, and good high temperature resistant mechanical property, has improved life cycle and the safety performance of tubing, meets GB to the strict demand of high-duty boiler seamless tube.
Improve its over-all properties as the starting point of invention to reduce material cost, obtain the success of large-scale commercial production, have good promotional value.
Description of drawings
Fig. 1 is the comparison diagram of each example yield strength among the present invention;
Fig. 2 is the comparison diagram of each example tensile strength among the present invention;
Fig. 3 is the comparison diagram of each example elongation among the present invention.
Embodiment
The present invention is to add trace rare-earth in the steel alloy at Cr-Mo, replaces a part of Cr to reduce the alloy total amount and reaches the purpose that improves the material at high temperature mechanical property.Steel-smelting production process is: molten iron → converter steelmaking → LF refining → VD is degassed → and round billet continuous casting.Converter smelting adopts the pre-treatment of KR(hot metal in steelmaking) pre-desulphurised hot metal, ferrosilicon, ferromanganese, ferrochrome and ferro-molybdenum deoxidation alloying, rare earth are fed the silk technology, and whole process is by the normal Argon of refining; Vacuum tightness≤0.10KPa, dark vacuum time 〉=13min, condensate depression Δ T≤30 ℃.Rolling technology is: circle base → sawing → ring furnace heating → perforation → PQF tandem rolling → stepped start-stop system reheating furnace → tension reducing → cold bed → scale → aligning → eddy current test → manual detection, spray mark → weigh → put in storage.
LF stove (LADLE FURNACE) is ladle refining furnace, is external refining equipment main in the Iron and Steel Production.VD shaped steel bag refining furnace is alloying constituent fine setting under oxygen blast under vacuum, decarburization, vacuum stripping, the vacuum, is mainly used in refining ultra low-carbon steel and electrical pure iron etc.; VD shaped steel bag refining furnace can carry out alloying constituent fine setting under general Fruit storage and the vacuum to molten steel.
The below specifies the production process of tubing among the present invention.
1. material is smelted
1.1 carry out molten iron smelting;
1.2 converter smelting;
Molten iron after pretreatment enters converter, oxygen decarburization heats up, and smelts later stage adding ferrosilicon, ferromanganese, ferrochrome and molybdenum-iron (specific chemical composition is as shown in table 1 below) deoxidation alloying, control P, S composition, prevent the molten steel peroxidation, 1600～1630 ℃ of tapping temperatures.
The various alloy material main chemical compositions of table 1 (mass percent, %)
| Title | C | Si | S | P | Mn | Cr | Mo | Fe |
| Ferromanganese | 7.5-8.5 | 1.5-2.5 | 0.02-0.05 | 0.2-0.33 | 75-82 | - | - | Residue |
| Ferrochrome | 5.5-6.5 | 3．0-4.0 | 0.04-0.06 | 0.02-0.04 | - | 62-72 | - | Residue |
| Molybdenum-iron | 0.08-0.12 | 1.4-1.6 | 0.08-0.12 | 0.04-0.07 | - | - | 65-75 | Residue |
| Ferrosilicon | 0.18-0.24 | 72-80 | 0.02-0.03 | 0.035-0.045 | 0.5-0.6 | 0.5-0.6 | - | - |
1.3 liquid steel refining;
Adopt ladle refining furnace (LF, LADLE FURNACE)+the omnidistance gon technics of vacuum degassing furnace (VD), evenly add in batches C, Si powder in the refining process, fully reduction, keep good reducing atmosphere, adopt the deoxidation of Al silk, the later stage adopts rare earth hello a silk technology (the rare earth alloy material is mishmetal, mainly take cerium as main) to make RE alloyed.Enter the VD stokehold, temperature is 1610 ~ 1630 ℃; W[S]≤0.007%.LF stove refining time is controlled at 45-60 minute; Carry out first thermometric after entering VD stove seat bag, temperature is controlled at 〉=1620 ℃, then advance the VD stove evacuation, vacuum tightness≤0.10KPa, dark vacuum time 〉=15min.
1.4 continuous casting of molten steel forms steel billet;
Molten steel advances middle bag temperature and is controlled at 1550-1580 ℃, superheating temperature Δ T≤30 ℃, and pulling rate is controlled at 0.65-0.75m/min.Is furnished with electromagnetic agitating technology, dynamic soft reduction technology, straightening temperature 〉=950 ℃.
2. weldless steel tube hot continuous rolling
Steel billet adopts ring furnace heating (it is as shown in table 2 below respectively to distinguish temperature), after heating is finished, enter successively conic perforator (gripping angle, guide plate distance, position, top and hot tool are adjusted according to the different size seamless tube) perforation, temperature is 1200～1260 ℃ during its circle base perforation; PQF continuous mill (adopting little steel rolling of drawing) is rolling, and temperature is 1050～1150 ℃ during tube rolling; Enter reheating furnace heating (or bypass), fixed according to practical situation, the stretch-reducing mill wroughtsteel pipe is to final size, and fixed temperature when subtracting is 820～900 ℃, forms at last Cr-Mo-RE low-alloy high-duty boiler weldless steel tube.
The adjustable limiting mandrel tandem rolling pipe machine of three rods is selected the PQF continuous mill, and the Italian INNSE of the smart tube rolling mill (PQF, Premium Quality Finishing) of high-efficiency high-quality company is that the inherent limitation that overcomes two roller continuous mills develops.
Table 2 ring furnace is respectively distinguished Heating temperature
| Heated zones | The preheating zone | Heating 1 district | Heating 2 districts | Heating 3 districts | Heating 4 districts | Heating 5 districts | The soaking zone | The district of coming out of the stove |
| Temperature (℃) | With furnace temperature | 750±5 | 950±5 | 1100±5 | 1220±5 | 1290±5 | 1280±10 | 1240±5 |
Cr-Mo-RE low-alloy high-duty boiler weldless steel tube is according to the chemical ingredients of mass percent, comprise: C0.05～0.15, Si0.25～0.50, Mn0.30～0.60, Cr0.8～1.5, Mo0.8～1.0, P≤0.025, S≤0.025, Al≤0.04, rare earth RE0.018～0.022, all the other unavoidably are mingled with for Fe reaches, and massfraction amounts to 100%.In the material composition of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube, main alloy element Cr makes steel have preferably resistance to corrosion, and Mo improves the hot strength of steel, and RE makes steel have good toughness and solidity to corrosion.
3. the material example is analyzed
3.1 material composition analysis
According to above smelting technology requirement, smelt the low-alloy high pressure boiler tube strand of following ingredients, concrete composition (mass percent) is as shown in table 3 below.
Each example chemical ingredients of table 3
3.2 Mechanics Performance Testing
The room-temperature mechanical property sample adopts bar-shaped sample, and 50mm calibrates distance, and specimen width is 12.7mm, and thickness is about 5.2mm.And about the sample wall thickness correction regulation of unit elongation impact is carried out relevant the correction by ASME SA213/SA213M-01.Obtained experimental result sees Table 4.
Table 4 material room temperature mechanical performance compare
3.3 high temperature, short time mechanical performance compare
As shown in Figure 1, the comparison diagram of each example yield strength among the present invention; Fig. 2 is the comparison diagram of each example tensile strength among the present invention; Fig. 3 is the comparison diagram of each example elongation among the present invention.
Contrasting three examples can find out, the tubing that the technology of the present invention is produced has good strength, toughness and mechanical property, and with the weldless steel tube of its preparation, properties all can satisfy GB to the requirement of seamless steel tubes and pipes for high pressure boiler.To sum up Performance Ratio, the selection of rare earth low-alloy high-duty boiler seamless tube is comparatively suitable.
Claims (10)
1. Cr-Mo-RE low-alloy high-duty boiler weldless steel tube, it is characterized in that: tubing comprises according to the chemical ingredients of mass percent: C0.05～0.15, Si0.25～0.50, Mn0.30～0.60, Cr0.8～1.5, Mo0.8～1.0, P≤0.025, S≤0.025, Al≤0.04, rare earth RE0.018～0.022, all the other are Fe and are mingled with that massfraction amounts to 100%.
2. Cr-Mo-RE low-alloy high-duty boiler weldless steel tube as claimed in claim 1, it is characterized in that: in the chemical ingredients of tubing according to mass percent, C is that 0.11, Si is 0.30, Mn is that 0.36, Cr is that 1.0, Mo is that 0.8, P is 0.014, S is that 0.004, Al is that 0.02, RE is 0.01.
3. Cr-Mo-RE low-alloy high-duty boiler weldless steel tube as claimed in claim 1, it is characterized in that: in the chemical ingredients of tubing according to mass percent, C is that 0.13, Si is 0.31, Mn is that 0.32, Cr is that 1.2, Mo is that 0.6, P is 0.016, S is that 0.003, Al is that 0.03, RE is 0.02.
4. Cr-Mo-RE low-alloy high-duty boiler weldless steel tube as claimed in claim 1, it is characterized in that: in the chemical ingredients according to mass percent, C is that 0.12, Si is 0.38, Mn is that 0.33, Cr is that 0.9, Mo is that 1.0, P is 0.014, S is that 0.002, Al is that 0.04, RE is 0.03.
5. the manufacture method of a Cr-Mo-RE low-alloy high-duty boiler weldless steel tube forms weldless steel tube after material smelting and two steps of weldless steel tube hot continuous rolling, and it is characterized in that: weldless steel tube tubing is according to the chemical ingredients of mass percent, comprise: C0.05～0.15, Si0.25～0.50, Mn0.30～0.60, Cr0.8～1.5, Mo0.8～1.0, P≤0.025, S≤0.025, Al≤0.04, rare earth RE0.018～0.022, all the other are Fe and are mingled with that massfraction amounts to 100%.
6. the manufacture method of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube as claimed in claim 5 is characterized in that: the step that material is smelted comprises that blast-melted smelting, converter smelting, liquid steel refining and continuous casting of molten steel form round steel billet; Wherein, in the converter smelting, molten iron after pretreatment enters converter, and oxygen decarburization heats up, and smelts later stage adding ferrosilicon, ferromanganese, ferrochrome and molybdenum-iron deoxidation alloying, and control P and S composition prevent the molten steel peroxidation, 1600～1630 ℃ of tapping temperatures; Liquid steel refining adopts the omnidistance gon technics of ladle refining furnace LF+ vacuum degassing furnace VD, evenly adds in batches C powder and Si powder in the refining process, and abundant reduction keeps reducing atmosphere, adopts the deoxidation of Al silk, and the later stage adopts rare earth hello a silk technology to make RE alloyed; Enter the VD stokehold, temperature is 1610 ~ 1630 ℃, w[S]≤0.007%; LF stove refining time is controlled at 45-60 minute, carries out first thermometric after entering VD stove seat bag, temperature is controlled at 〉=1620 ℃, then advances the VD stove evacuation, vacuum tightness≤0.10KPa, dark vacuum time 〉=15min; Continuous casting of molten steel forms in the steel billet process, and molten steel advances middle bag temperature and is controlled at 1550-1580 ℃, superheating temperature Δ T≤30 ℃, and pulling rate is controlled at 0.65-0.75m/min, straightening temperature 〉=950 ℃.
7. the manufacture method of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube as claimed in claim 5, it is characterized in that: in the weldless steel tube during Hot Strip Rolling, steel billet adopts the ring furnace heating, after heating is finished, enter the conic perforator perforation, temperature is 1200～1260 ℃ during its circle base perforation; Employing was little after perforation was finished draws steel rolling rolling, and temperature is 1050～1150 ℃ during tube rolling; Enter reheating furnace heating by the stretch-reducing mill wroughtsteel pipe to final size, fixed temperature when subtracting is 820～900 ℃, forms at last Cr-Mo-RE low-alloy high-duty boiler weldless steel tube.
8. the manufacture method of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube as claimed in claim 5, it is characterized in that: in the chemical ingredients of tubing according to mass percent, C is that 0.11, Si is that 0.30, Mn is 0.36, Cr is 1.0, Mo is that 0.8, P is that 0.014, S is 0.004, Al is that 0.02, RE is 0.01.
9. the manufacture method of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube as claimed in claim 5, it is characterized in that: in the chemical ingredients of tubing according to mass percent, C is that 0.13, Si is that 0.31, Mn is 0.32, Cr is 1.2, Mo is that 0.6, P is that 0.016, S is 0.003, Al is that 0.03, RE is 0.02.
10. the manufacture method of Cr-Mo-RE low-alloy high-duty boiler weldless steel tube as claimed in claim 5, it is characterized in that: in the chemical ingredients according to mass percent, C is that 0.12, Si is 0.38, Mn is that 0.33, Cr is that 0.9, Mo is that 1.0, P is 0.014, S is that 0.002, Al is that 0.04, RE is 003.
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| CN201310031375.XA CN103074544B (en) | 2013-01-28 | 2013-01-28 | Cr-Mo-RE low-alloy seamless steel pipe for high-pressure boiler and manufacturing method of pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103215518A (en) * | 2013-05-14 | 2013-07-24 | 内蒙古包钢钢联股份有限公司 | Seamless steel tube material for rare-earth-containing H2S corrosion-resistant pipeline, and production method thereof |
| CN104911490A (en) * | 2015-04-27 | 2015-09-16 | 内蒙古包钢钢联股份有限公司 | 13Cr1Mo1V heat resistant seamless steel pipe and seamless preparation method |
| CN113025902A (en) * | 2021-03-04 | 2021-06-25 | 东北大学 | Hot-rolled seamless steel tube with excellent toughness and manufacturing method thereof |
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| JPH0250912A (en) * | 1988-08-11 | 1990-02-20 | Nippon Steel Corp | Production of low alloy high tension seamless steel pipe having fine grained structure |
| CN1360081A (en) * | 2001-07-17 | 2002-07-24 | 束润涛 | Low-alloy rare-earth steel resisting corrosion of hydrogen sulfide |
| CN102534388A (en) * | 2011-12-07 | 2012-07-04 | 内蒙古包钢钢联股份有限公司 | Rare earth containing H2S-corrosion resistance petroleum casing pipe and production method thereof |
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| JPH0250912A (en) * | 1988-08-11 | 1990-02-20 | Nippon Steel Corp | Production of low alloy high tension seamless steel pipe having fine grained structure |
| CN1360081A (en) * | 2001-07-17 | 2002-07-24 | 束润涛 | Low-alloy rare-earth steel resisting corrosion of hydrogen sulfide |
| CN102534388A (en) * | 2011-12-07 | 2012-07-04 | 内蒙古包钢钢联股份有限公司 | Rare earth containing H2S-corrosion resistance petroleum casing pipe and production method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215518A (en) * | 2013-05-14 | 2013-07-24 | 内蒙古包钢钢联股份有限公司 | Seamless steel tube material for rare-earth-containing H2S corrosion-resistant pipeline, and production method thereof |
| CN103215518B (en) * | 2013-05-14 | 2016-04-20 | 内蒙古包钢钢联股份有限公司 | Containing the resistance to H of rare earth 2the preparation method of S corroded pipeline weldless steel tube |
| CN104911490A (en) * | 2015-04-27 | 2015-09-16 | 内蒙古包钢钢联股份有限公司 | 13Cr1Mo1V heat resistant seamless steel pipe and seamless preparation method |
| CN113025902A (en) * | 2021-03-04 | 2021-06-25 | 东北大学 | Hot-rolled seamless steel tube with excellent toughness and manufacturing method thereof |
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