CN104726781B - One kind conveying wear-resisting seamless steel pipe and its production method - Google Patents
One kind conveying wear-resisting seamless steel pipe and its production method Download PDFInfo
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Abstract
The invention provides one kind conveying wear-resisting seamless steel pipe and its production method, the production method is comprised the following steps：Smelting obtains the chemical composition of pipe：C：0.28~0.36%, Si：0.70~1.30%, Mn：2.80~3.20%, V：0.05~0.15%, Nb：0.02~0.04%, Cr：0.40~0.80%, Mo：0.14~0.26%, B：0.0005~0.0035%, As：0~0.015%, Sn：0~0.010%, P：0~0.015%, S：0~0.010%, and surplus Fe etc.；Rolling pipe, the heating-up temperature of pipe is 1220~1260 DEG C before rolling, and finishing temperature is 860~900 DEG C；The heat treatment of seamless steel pipe, including quenching and tempering, quenching temperature is 890~950 DEG C, and quenching mode adds interior axle stream for outer spray, and tempering heating-up temperature is 380~460 DEG C.Using the seamless steel pipe for being produced of the invention by after the pressure processing of aximal deformation value and heat treatment, the complex tissue of the fine carbide of secondary troostite and disperse educt being obtained, while having preferable anti-wear performance and low temperature impact properties.
Description
Technical field
The invention belongs to metallurgical industry production seamless steel pipe technical field, it relates in particular to wear-resisting nothing is used in a kind of conveying
Seam steel pipe and its production method,
Background technology
It is annual to be used to convey ferroalloy, coal, ore, rock, plasma discharge etc. in metallurgy, mine, building materials, power industry
The consumption of abrasion-proof pipe be very huge.
Above-mentioned abrasion-proof pipe is commonly applied to low temp operation environment, and the impulsive force that course of conveying is subject to is larger, and early stage easily occurs
Failure.Therefore, its operating environment requirements abrasion-proof pipe should simultaneously have preferable anti-wear performance and low-temperature flexibility.
The abrasion-proof pipe that application is most at present, consumption is maximum is still with wear resistant cast iron, abrasion resistant cast steel pipeline and compound pipeline complex pipeline
Based on, but its manufacturing process is complicated, and relatively costly, combination of strength and toughness is undesirable.Secondary troostite steel has obdurability higher
Coordinate, can be applied to wear-resistant steel pipe field, solve the problems, such as that the low-temperature flexibility that current abrasion-proof pipe is present is relatively low.
The content of the invention
In view of the shortcomings of the prior art, an object of the present invention be provide a kind of wear-resisting seamless steel pipe of conveying and its
Production method, the seamless steel pipe has preferable anti-wear performance and low-temperature impact toughness simultaneously.
To achieve these goals, an aspect of of the present present invention provides a kind of conveying with the producer of wear-resisting seamless steel pipe
Method, the production method is comprised the following steps：
A, smelting pipe, the chemical composition of the pipe include C 0.28~0.36%, Si 0.70 by weight percentage
~1.30%, Mn 2.80~3.20%, V 0.05~0.15%, Nb 0.02~0.04%, Cr 0.40~0.80%, Mo
0.14~0.26%, B 0.0005~0.0035%, As 0~0.015%, Sn 0~0.010%, P 0~0.015%, S 0
~the 0.010% and Fe of surplus.
B, by billet production into seamless steel pipe, the heating-up temperature of pipe is 1220~1260 DEG C before rolling, controls finish to gauge temperature
Spend is 860~900 DEG C.
C, the seamless steel pipe that will be made are heat-treated, including quenching and be tempered, quenching temperature be 890~~950
DEG C, quenching mode is outer spray plus interior axle stream, and tempering heating-up temperature is 380~460 DEG C.
Preferably, the chemical composition of the pipe is by weight percentage：C 0.32%, Si 1.00%, Mn
3.0%, V 0.08%, Nb 0.03%, Cr 0.60%, Mo 0.20%, B 0.0025, As 0.012%, Sn 0.008%, P
The Fe and inevitable impurity of 0.01%, S 0.008% and surplus.
Preferably, the heating-up temperature of pipe is 1240 DEG C before the rolling.
Preferably, the hardening heat of the seamless steel pipe heat treatment is 920 DEG C, and temperature is 420 DEG C.
According to a further aspect of the invention, there is provided wear-resisting seamless steel pipe is used in one kind conveying, the conveying is with wear-resisting seamless steel
The chemical composition of pipe is by weight percentage：C 0.28~0.36%, Si 0.70~1.30%, Mn 2.80~3.20%, V
0.05~0.15%, Nb 0.02~0.04%, Cr 0.40~0.80%, Mo 0.14~0.26%, B 0.0005~
The Fe of 0.0035%, As 0~0.015%, Sn 0~0.010%, P 0~0.015%, S 0~0.010% and surplus.
Preferably, described conveying is by weight percentage with the chemical composition of wear-resisting seamless steel pipe：C 0.32%, Si
1.00%, Mn 3.0%, V 0.08%, Nb 0.03%, Cr 0.60%, Mo 0.20%, B 0.0025, As 0.012%, Sn
The Fe and inevitable impurity of 0.008%, P 0.01%, S 0.008% and surplus.
Wherein, the conveying with wear-resisting seamless steel pipe~30 degree impact (AKV) not less than 21J, hardness is not less than
42HRC。
With the wear resistant cast iron without pressure processing, compared with abrasion resistant cast steel pipeline, the conveying produced using the technology of the present invention
With wear-resisting seamless steel pipe by simultaneously after the pressure processing of aximal deformation value, its crystal grain refinement, dense structure can have preferably resistance to
Mill performance and low-temperature impact toughness.
It is that secondary troostite and disperse are analysed to use the conveying that the technology of the present invention the is produced metallographic structure of wear-resisting seamless steel pipe
The complex tissue of the fine carbide for going out, its low-temperature impact toughness is substantially better than the wear-resisting seamless steel pipe of existing lower bainite, and
Anti-wear performance is then suitable with the wear-resisting seamless steel pipe of lower bainite.
The present invention solves the problem of domestic, international compound pipeline complex pipeline double-layer structure, the wear-resisting seamless steel pipe of conveying of production
Can simultaneously have preferable anti-wear performance and low-temperature impact toughness, solve the wear-resisting seamless steel pipe low-temperature impact toughness of lower bainite
Relatively low problem.
Specific embodiment
Hereinafter, will be described in detail with reference to exemplary embodiment a kind of wear-resisting seamless steel pipe of conveying of the invention and
Its production method.
Conveying according to an aspect of the present invention includes step with the production method of wear-resisting seamless steel pipe：
A, smelting pipe, the chemical composition of the pipe is by weight percentage C 0.28~0.36%, Si 0.70~
1.30%, Mn 2.80~3.20%, V 0.05~0.15%, Nb 0.02~0.04%, Cr 0.40~0.80%, Mo 0.14
~0.26%, B 0.0005~0.0035%, As 0~0.015%, Sn 0~0.010%, P 0~0.015%, S 0~
The 0.010% and Fe of surplus；
B, by billet production into seamless steel pipe, the heating-up temperature of pipe is 1220~1260 DEG C before rolling, controls finish to gauge temperature
Spend is 860~900 DEG C.
C, the seamless steel pipe that will be made are heat-treated, including quenching and tempering, and quenching temperature is 890~950 DEG C,
Quenching mode is outer spray plus interior axle stream, and tempering heating-up temperature is 380~460 DEG C.
Further, the chemical composition of the pipe is by weight percentage：C 0.32%, Si 1.00%, Mn
3.0%, V 0.08%, Nb 0.03%, Cr 0.60%, Mo 0.20%, B：0.0025, As 0.012%, Sn 0.008%, P
The Fe and inevitable impurity of 0.01%, S 0.008% and surplus.
Further, the heating-up temperature of pipe is 1240 DEG C before the rolling.
Further, the hardening heat of the seamless steel pipe heat treatment is 920 DEG C, and temperature is 420 DEG C.
Conveying according to a further aspect of the invention is by weight percentage with the chemical composition of wear-resisting seamless steel pipe：C
0.28~0.36%, Si 0.70~1.30%, Mn 2.80~3.20%, V 0.05~0.15%, Nb 0.02~0.04%,
Cr 0.40~0.80%, Mo 0.14~0.26%, B 0.0005~0.0035%, As 0~0.015%, Sn 0~
The Fe of 0.010%, P 0~0.015%, S 0~0.010% and surplus.
Further, described conveying is by weight percentage with the chemical composition of wear-resisting seamless steel pipe：C0.32%, Si
1.00%, Mn 3.0%, V 0.08%, Nb 0.03%, Cr 0.60%, Mo 0.20%, B：0.0025, As 0.012%, Sn
The Fe and inevitable impurity of 0.008%, P 0.01%, S 0.008% and surplus.
Remaining step for producing above-mentioned steel pipe is identical with the production method of conventional seamless steel pipe.
The present invention design conveying belong to medium carbon low alloy steel with wear-resisting seamless steel pipe, its alloying component based on manganese, silicon,
Adding again has the alloying elements such as strong Ying Xiang Chrome, molybdenum, vanadium, niobium, boron to material matrix tissue and quenching degree.
Wherein, the content of manganese is 2.80~3.20%, hence it is evident that higher than the manganese content in general middle low-carbon abrasion resistant steel, its is main
Effect is the quenching degree and anti-wear performance for improving steel pipe；
Silicon can improve the intensity and hardness of steel, increase steel belt roof bolt stability, and integrated silicon is each with tissue to the performance of steel
Influence is planted, the content range of silicon is scheduled on 0.70~1.30%；
Carbon is influence steel strength, hardness, toughness and quenching degree, the vital element of wearability.Carbon amounts is too high, heat
Steel pipe hardness is high after treatment, and toughness is low, and easily crackle is formed during heat treatment；Carbon amounts is too low, and quenching degree is poor, and hardness is low, and wearability is not
It is good.Consider the cooperation of wearability and toughness, the content range of carbon is scheduled on 0.28~O.36%；
The Main Function of chromium is the quenching degree for improving steel, while solution strengthening matrix, increases its erosion-resisting ability, chromium and
The multiple compounds formed with carbon play an important role for improving wearability.But chromium also has the tendency of to increase steel belt roof bolt fragility.
Various influences of the composite chromium on the tissue and performance of steel, 0.40~0.80% is scheduled on by the content range of chromium；
Molybdenum acting as in steel is improved quenching degree, prevents temper brittleness, improve corrosion stability in some media with it is anti-
Stop erosion tendency etc..When molybdenum is present in steel as single alloying element, increase steel belt roof bolt fragility, but cause back with other
The element of fiery fragility, such as chromium, manganese and when depositing, molybdenum reduces or suppresses the temper brittleness caused by other elements again.Due to not
With the content of molybdenum may produce different influences to the performance of steel, in summary factor, the content of molybdenum is scheduled on 0.14~
0.26%.
Vanadium belongs to carbide.It is exist with the carbide form of very disperse in steel due to vanadium, makes
These carbide dissolutions are to requiring heat to temperature very high in austenite.Therefore, the carbide of vanadium plays refinement crystalline substance in steel
Grain and the effect for increasing wearability.In summary factor, 0.05~0.15% is scheduled on by the content range of vanadium.
Effect of the niobium in steel embodies following two aspects：One crystal grain thinning；Two is to play precipitation enhancement to improve strong
Degree；Three is that after adding niobium and vanadium simultaneously in the steel, can make full use of the reciprocation between niobium and vanadium, plays niobium vanadium complex intensifying
Effect.In summary the content of niobium, is scheduled on 0.02~0.04% by factor.
The prominent effect in steel of boron is the quenching degree that micro boron just can exponentially increase steel.Trace B has makes Ovshinsky
The tendency that body crystal grain is grown up, when O.007% the content of boron is more than, it will cause the hot-short phenomenon of steel.Therefore the content of boron
It is determined that 0.0005~0.0035%.
Due to sulphur, phosphorus and arsenic, the easy intercrystalline precipitation of selenium element, crystal boundary is weakened, cause intercrystalline britftleness, therefore, to improve steel
The impact flexibility of pipe, the present invention has carried out strict limitation to the content of the sulphur in material, phosphorus and arsenic, selenium.
It is to obtain excellent wearability, the conveying of present invention design adds 2.80 in the material with wear-resisting seamless steel pipe~
3.20% manganese, its content is apparently higher than common middle low-carbon abrasion resistant steel.Due to the manganese of high content can cause steel pipe coarse grains,
Segregation is serious, therefore, added to crystal grain thinning and vanadium, the niobium element of organizing remarkable effect, to support in material again simultaneously
The negative effect that the manganese On Impact Toughness that disappears rises.
The conveying of present invention design is proper with the content proportioning of the carbon in wear-resisting seamless steel pipe material and various alloying elements,
With excellent quenching degree, steel tube surface can be made to be easy to through hardening with center portion, so as to the technology for reducing quenching heat treatment is difficult
Degree, makes steel pipe whole cross section obtain the mechanical property of uniformity.
When steel pipe rolling is carried out, the heating-up temperature and finishing temperature of pipe are strictly controlled, if the heating temperature of pipe
Degree is more than 1260 DEG C, although be conducive to improving the production efficiency of tube rolling, but finishing temperature is high, coarse grains, and properties of product are difficult
In guarantee；If the heating-up temperature of pipe is less than 1220 DEG C, the consumption of tube rolling instrument is big, the low production efficiency of tube rolling, finish to gauge temperature
Degree is low, and properties of product also are difficult to ensure.
The conveying of present invention design is quenching+average tempering, its Quench heating with the heat treating regime of wear-resisting seamless steel pipe
Temperature is 890~950 DEG C.If hardening heat is too high, crystal grain will tend to thick, and the low-temperature impact toughness of steel pipe declines；If
Hardening heat is too low, and the alloying element quantity for dissolving in austenite is reduced, and intensity and the hardness of steel pipe decline.
At present, the heat treating regime of " quenching+lonneal " is taken after many abrasion-resistant stee roll formings, is tempered
Martensitic structure, the characteristics of the tissue maintains martensite high rigidity and high-wearing feature, but impact flexibility is extremely low.Lower bainite is resistance to
Take the heat treating regime of " air cooling+lonneal " or Direct Air-Cooled as mill roll seamless steel tube shaping is latter, its hardness with it is resistance to
Mill property is less than tempered martensite abrasion-resistant stee, though impact toughness at room temperature is apparently higher than tempered martensite abrasion-resistant stee, its low-temperature impact
Toughness is still in a relatively low level.And the heat treating regime of quenching+average tempering that the present invention is used, obtain steel pipe
The complex tissue of the fine carbide of secondary troostite and disperse educt, it is wear-resisting that its low-temperature impact toughness is significantly better than lower bainite
Seamless steel pipe, and anti-wear performance is then suitable with the wear-resisting seamless steel pipe of lower bainite.
Come illustrative to the present invention below in conjunction with specific example.
1st, pipe is smelted
By smelting and continuous casting, the pipe of example 1 to 3 is obtained.The chemical composition of the pipe of example 1 to 3 is as shown in table 1,
Surplus in pipe except as described below is Fe, and may also contain inevitable impurity.
The chemical composition (wt%) of the pipe of table 1, example 1 to 3
| Example | C | Si | Mn | V | Nb | P | S | Cr | B | Mo | As | Sn |
| 1 | 0.325 | 0.95 | 2.95 | 0.07 | 0.030 | 0.01 | 0.007 | 0.65 | 0.0028 | 0.20 | 0.01 | 0.006 |
| 2 | 0.315 | 1.10 | 2.88 | 0.08 | 0.029 | 0.012 | 0.009 | 0.58 | 0.003 | 0.25 | 0.01 | 0.006 |
| 3 | 0.330 | 1.05 | 2.98 | 0.08 | 0.030 | 0.008 | 0.008 | 0.72 | 0.0029 | 0.19 | 0.01 | 0.006 |
In smelting, external refining, casting cycle, operated in strict accordance with specification, make the chemical composition of steel uniform, steel
Matter is pure, to ensure the performance of steel pipe.
2nd, rolled steel tube
The various technological parameters such as heating-up temperature, the finishing temperature of pipe are controlled in the operation of rolling, is referred to meeting steel tube performance
Mark.Main technologic parameters are：Annular furnace heating-up temperature is：1220~1260 DEG C, finishing temperature is 880 DEG C ± 20 DEG C.
3rd, steel pipe heat treatment
The seamless steel pipe that will be made is heat-treated, including quenching and tempering, and it is 890~950 to control quenching temperature
DEG C, the quenching mode for using is outer spray plus interior axle stream, and it is 380~460 DEG C to control tempering heating-up temperature.
4th, steel tube performance detection
The conveying of example 1~3 is shown in Table 2~table 3 with the performance test results of wear-resisting seamless steel pipe.
Table 2, the non-metallic inclusion of the seamless steel pipe of example 1~3 and grain size situation
The mechanical property of table 3, the seamless steel pipe of example 1~3
The conveying that can be seen that present invention design from the testing result of table 2 and table 3 is pure with the steel of wear-resisting seamless steel pipe
Only, grain size is tiny, and~30 DEG C of impacts (AKV) are not less than 21J, and hardness is not less than 42HRC.With good impact property and resistance to
Mill performance.
The conveying of present invention design has preferable anti-wear performance and low-temperature impact toughness simultaneously with wear-resisting seamless steel pipe, this
For the service life for improving abrasion-proof pipe, maintenance of equipment work amount is reduced, improve equipment operating efficiency, prevent conveying with wear-resisting
Seamless steel pipe initial failure, increases economic efficiency, and has very important significance.
Although being described in detail to the present invention above in association with embodiment, as the ordinary skill people of this area
Member can carry out various modifications it should be understood that in the case where spirit and scope by the claims is not departed from, and be also at the present invention
Protection domain within.
Claims (7)
1. it is a kind of to convey with the production method of wear-resisting seamless steel pipe, it is characterised in that the production method is comprised the following steps：
A, smelting pipe, the chemical composition of the pipe include C by weight percentage：0.28~0.36%, Si：0.70~
1.30%, Mn：2.80~3.20%, V：0.05~0.15%, Nb：0.02~0.04%, Cr：0.40~0.80%, Mo：0.14
~0.26%, B：0.0005~0.0035%, As：0~0.015%, Sn：0~0.010%, P：0~0.015%, S：0~
The 0.010% and Fe of surplus；Wherein the content of As, Sn, P, S is not 0；
B, by billet production into seamless steel pipe, the heating-up temperature of pipe is 1220~1260 DEG C before rolling, controls the finishing temperature to be
860~900 DEG C；
C, the seamless steel pipe that will be made are heat-treated, including quenching and tempering, and quenching temperature is 890~950 DEG C, quenching
Mode is outer spray plus interior axle stream, and tempering heating-up temperature is 380~460 DEG C.
2. it is according to claim 1 to convey with the production method of wear-resisting seamless steel pipe, it is characterised in that the change of the pipe
Study includes C point by weight percentage：0.32%, Si：1.00%, Mn：3.0%, V：0.08%, Nb：0.03%, Cr：
0.60%, Mo：0.20%, B：0.0025, As：0.012%, Sn：0.008%, P：0.01%, S：0.008% and surplus
Fe and inevitable impurity.
It is 3. according to claim 1 to convey with the production method of wear-resisting seamless steel pipe, it is characterised in that：The billet production
Preceding heating-up temperature is 1240 DEG C.
It is 4. according to claim 1 to convey with the production method of wear-resisting seamless steel pipe, it is characterised in that：Nothing described in step c
The hardening heat for stitching steel pipe is 920 DEG C, and temperature is 420 DEG C.
5. wear-resisting seamless steel pipe is used in a kind of conveying, is produced by claim 1 methods described and obtained, it is characterised in that be described
Convey includes C by weight percentage with the chemical composition of wear-resisting seamless steel pipe：0.28~0.36%, Si：0.70~1.30%,
Mn：2.80~3.20%, V：0.05~0.15%, Nb：0.02~0.04%, Cr：0.40~0.80%, Mo：0.14~
0.26%, B：0.0005~0.0035%, As：0~0.015%, Sn：0~0.010%, P：0~0.015%, S：0~
The 0.010% and Fe of surplus, the wherein content of As, Sn, P, S are not 0.
6. wear-resisting seamless steel pipe is used in conveying according to claim 5, it is characterised in that the wear-resisting seamless steel pipe of the conveying
Chemical composition by weight percentage include C：0.32%, Si：1.00%, Mn：3.0%, V：0.08%, Nb：0.03%,
Cr：0.60%, Mo：0.20%, B：0.0025, As：0.012%, Sn：0.008%, P：0.01%, S：0.008% and surplus
Fe and inevitable impurity.
7. wear-resisting seamless steel pipe is used in conveying according to claim 5, it is characterised in that：Wear-resisting seamless steel pipe is used in the conveying
- 30 DEG C impact (AKV) be not less than 21J, hardness be not less than 42HRC.
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|---|---|---|---|---|
| US5938865A (en) * | 1995-05-15 | 1999-08-17 | Sumitomo Metal Industries, Ltc. | Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance |
| CN1477225A (en) * | 2003-08-01 | 2004-02-25 | 清华大学 | Medium carbon and medium-high carbon manganese system self-hardening bainite steel |
| CN102534432A (en) * | 2012-01-10 | 2012-07-04 | 清华大学 | Method for manufacturing and tempering bainite wear-resistant steel and steel pipe |
| CN102747272A (en) * | 2012-08-01 | 2012-10-24 | 攀枝花贝氏体耐磨管道有限公司 | B-P-T steel tube and preparation method thereof |
| CN102776445A (en) * | 2012-07-27 | 2012-11-14 | 攀枝花贝氏体耐磨管道有限公司 | Lower bainite wear-resisting steel tube for slurry transport and production method of steel tube |
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2015
- 2015-04-08 CN CN201510163300.6A patent/CN104726781B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5938865A (en) * | 1995-05-15 | 1999-08-17 | Sumitomo Metal Industries, Ltc. | Process for producing high-strength seamless steel pipe having excellent sulfide stress cracking resistance |
| CN1477225A (en) * | 2003-08-01 | 2004-02-25 | 清华大学 | Medium carbon and medium-high carbon manganese system self-hardening bainite steel |
| CN102534432A (en) * | 2012-01-10 | 2012-07-04 | 清华大学 | Method for manufacturing and tempering bainite wear-resistant steel and steel pipe |
| CN102776445A (en) * | 2012-07-27 | 2012-11-14 | 攀枝花贝氏体耐磨管道有限公司 | Lower bainite wear-resisting steel tube for slurry transport and production method of steel tube |
| CN102747272A (en) * | 2012-08-01 | 2012-10-24 | 攀枝花贝氏体耐磨管道有限公司 | B-P-T steel tube and preparation method thereof |
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