CN101280391B - High-strength tough hydraulic prop seamless steel pipe - Google Patents
High-strength tough hydraulic prop seamless steel pipe Download PDFInfo
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- CN101280391B CN101280391B CN2008100443818A CN200810044381A CN101280391B CN 101280391 B CN101280391 B CN 101280391B CN 2008100443818 A CN2008100443818 A CN 2008100443818A CN 200810044381 A CN200810044381 A CN 200810044381A CN 101280391 B CN101280391 B CN 101280391B
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Abstract
The invention relates to a high tensile toughness hydraulic pillar seamless steel tube, which solves the problems that in the prior hydraulic prop seamless steel tube, either the cost is high, or thestrength and the toughness is low, and the economic and safe combination property is not provided. According to the weight percentage, the high tensile toughness hydraulic pillar seamless steel tube comprises 0.15 percent-0.35 percent of C, 0.10 percent to 0.60 percent of Si, 1.00 percent to 2.00 percent of Mn, 0.02 percent to 0.07 percent of Nb, 0.01 percent to 0.06 percent of Al, 0.02 percent to0.12 percent of Ti, lower than 0.025 percent of P, lower than 0.024 percent of S and lower than 0.0035 percent of O.
Description
Technical field:
The present invention relates to a kind of hydraulic prop seamless steel pipe that is used for comprehensive mechanization fields such as coal, machinery, be specifically related to a kind of high-intensity high-tenacity of economy and have superior weldability can hydraulic prop seamless steel pipe
Background technology:
The hydraulic prop pipe is the hydraulic prop and the used important materials of mining bracket major parts (cylinder body or plunger) of fully-mechanized minings such as coal, machinery.The use of hydraulic prop pipe requires to have good security and reliability, weldability, machinability etc.
1. security and reliability: the operating pressure height of hydraulic prop, in case when cylinder body or plunger pressurized and must not be cleaved into fragment when being destroyed, in case hurt sb.'s feelings.For the safety that guarantees to use and reliable, the hydraulic prop pipe must have high strength and toughness is good.
2. good weldability: hydraulic prop, hydraulic support pillar cylinder body, plunger all are connected with welding process with miscellaneous part, and the steel pipe that therefore requires to use must have good weldability.
3. good machinability: when making hydraulic prop, the inside and outside surface of steel pipe all needs precision work, therefore requires steel pipe must have good cutting and abrasive property.
The hydraulic prop tube steel is except that minority is carbon steel, and great majority are high strength alloy steel.External like product is many to be that steel is made with CrMo, as Germany's (25CrMo4 steel among the DIN1629/DIN17200), Japan's (STKSI steel among the JISG3441, be equivalent to China 30CrMo steel), country such as U.S. adopts the CrMo steel, country such as Russia, Poland employing Cr steel (40Cr), CrMnSi steel (30CrMnSi) etc.As a kind of employing UOE tubulation method of SUMITOMO CHEMICAL metal industry Co., Ltd. invention, keep rolling state not heat-treat and make side (%) C:01-0.18 of the round pillar of low yielding ratio with steel pipe, Si:0.05-0.55, P:＜0.030, S:＜0.015, Mn:1.00-1.60 (CN1924060); The steel grade that Japan SUMITOMO METAL IND has invented a kind of high-tensile, excellent weldability and anti-stress relief cracking is used to make pressurized vessel and hydraulic steel pipe, composition (%) C:0.03-0.20, Si :≤1.0, Mn:0.3-2.0, P :≤0.02, S :≤0.001, Cr:0.3-3.0, Mo:0.2-2.0, V :≤0.5, Al:0.003-0.10, B:0.0003-0.006 and surplus Fe, in addition, also have Cu :≤2.0 or Ni :≤5.0, tensile strength is 〉=70kg/mm
2(JP5051696); Japan SUMITOMO METAL IND has invented the good Electric Welded Steel Pipe of a kind of machinability and can be used for hydro-cylinder, composition (%) C :≤0.25, and Mn :≤1.60, Nb:0.010-0.050, surplus is Fe (JP3028322); Italy AGAZZIGIANMARIO etc. has invented a kind of precision tube and has been used for the hydro-cylinder that low temperature uses, composition (%) C:0.06-0.15, Mn:0.30-2.5, Si:0.10-0.60 (WO2008000300); Manton.R B has invented a kind of High-Strength Low-Alloy that contains niobium can weld weldless steel tube, composition (%) C:0.24-0.28, Mn:1.30-1.50, Si:0.15-0.35, S: ≯ 0.01, P: ≯ 0.03, Cu ≯ 0.20, Cr:0.13-0.20, Mo:0.15-0.60, Al:0.007-0.005, N ≯ 0.02, Ti:0.02-0.04, B:0.0007-0.0025; Nb:0.02-0.10, surplus is Fe (US4784704).Domestic hydraulic prop is the 27SiMn steel with the main steel grade of pipe, China Coal Research Institute has been developed a kind of new tubing of hydraulic prop-meta-bainite steel pipe that is used for, its BZ-11G type quasi-bainite steel, main added elements is middlebrow alloying element, belong to low alloy steel, tensile strength＞1090MPa, yield is greater than 850MPa; Shoudu Iron and Steel Co has been invented a kind of high-toughness low-alloy constructional steel and production method thereof, and it can be used for fields such as coal mine hydraulic supporting, composition (%) C:0.05-0.60, Si:0.05-0.70, Mn:0.5-2.5, P :≤0.04, S :≤0.04, Cr:0-0.70, Ni:0-0.70, Mo:0-0.60, Cu:0-0.20, V:0.01-0.30, Al:0-0.1, Nb:0.001-0.10, N:0.004-0.02, iron surplus.
In sum, the hydraulic prop seamless steel pipe steel is SiMn steel and CrMo steel at present, though the SiMn production cost is low, does not have high strength and high tenacity, is difficult to satisfy the requirements at the higher level of comprehensive mechanization field production securities such as coal, machinery; Though CrMo has high strength and high tenacity, the production cost height.
Summary of the invention:
(the comparing), the high strength (yield strength: 750～800N/mm that the purpose of this invention is to provide a kind of economy with CrMo
2), high tenacity (Charpy-V impact power :-20 ℃ 50～60J) and have superior weldability can the hydraulic prop seamless steel pipe steel.Can be widely used in the demanding fields of comprehensive mechanization production security such as coal, machinery.
The present invention is achieved in that
A kind of high-strength tough hydraulic prop seamless steel pipe of the present invention, % by weight, contain C:0.15%-0.35%, Si:0.10%-0.60%, Mn:1.00%-2.00%, Nb:0.02%-0.07%, Al:0.01%-0.06%, Ti:0.02%-0.12%, P:0.025% is following, S:0.025% is following, below the 0:0.0035%.
% is made up of following ingredients by weight: below C:0.20%-0.28%, Si:0.25%～0.45%, Mn:1.55%-1.70%, Nb:0.03%-0.05%, Al:0.01-0.05%, Ti:0.02%-0.06%, the P:0.02%, below the S:0.02%, below the 0:0.0035%, surplus is made of Fe and impurity.
With part Fe by weight % be replaced as B:0.0005%-0.002%.
With part Fe by weight % be replaced as N:0.0050%-0.01%.
Part a kind or 2 kinds of replacements from B:0.0008%-0.0015%, N:0.0060%-0.0080%, selecting of % by weight with Fe.
The carbon equivalent Ceq. of this steel (%) is 0.32%～0.68%, Ceq.=C+Mn/6.
Carbon amount Ceg:(%) be 0.44%-0.56%, Ceq=C+Mn/6.
Final rolling temperature is 1220 ℃-1260 ℃ in the tubulation operation, and weldless steel tube is through Overheating Treatment, and its thermal treatment process is: 920 ℃ of insulation 90min, shrend, 530 ℃ of insulation 120min, water-cooled.
The present invention is in order to obtain a kind of high-strength tough hydraulic prop seamless steel pipe, and following measure is effective.
1. C and Mn are the most basic elements in the composition of steel design.C is traditional most economical strengthening element, and the intensity of steel almost is that the increase with C% linearly increases, but it is extremely harmful to plasticity, the toughness of steel, therefore, to be controlled in right amount the C content in the steel, both satisfied the requirement of yield strength, be satisfied the requirement of impelling strength again.
Reducing the yield strength reduction that C causes in the steel can adopt increase Mn to be compensated.Mn is weak carbide forming element, and solid solution is among ferrite under the room temperature, and Mn plays the solution strengthening effect, can also enlarge the alloying element in the γ zone of iron simultaneously; Increase the content of Mn in the steel, make its pearlite colony become tiny, can effectively improve the toughness of steel.
Consider that from guaranteeing suitable strength and toughness coupling angle preferred C content is controlled at 0.20%～0.28% scope; Preferred Mn content is controlled at 1.45%～1.70% scope.
Deoxidation improved the effect of intensity simultaneously when 2. Si had melting.
Consider that from guaranteeing suitable strength and toughness coupling angle preferred Si content is controlled at 0.25%～0.45% scope.
3. Nb, Ti are present most widely used micro alloying elements, and the microstructure parameter that they can influence in steel is grain-size and shape; The precipitate of various size; Dislocation desity; The size and dimension of non-metallic inclusion etc.Effect in steel: stop grain growth; Stop the ausforming recrystallize; Precipitation strength; Change the microstructure of steel.
Consider that from guaranteeing suitable strength and toughness coupling angle preferred Nb content is controlled at 0.03%～0.05% scope; Preferred Ti content is controlled at 0.02%～0.06% scope.
4. N is the very strong formation and the element of stable austenite.N and Ti, Nb have very strong avidity, can form the gap phase of stabilizer pole.Also can dissolve mutually between the nitride, form complex nitride, and exist, produce dispersion-strengthened effect, improve the intensity of steel with tiny particle.Al compound formation AlN in N and the steel.AlN and TiN, NbN etc. can stop AUSTENITE GRAIN COARSENING effectively, obtain tiny ferrite crystal grain, help improving the toughness of steel.
Consider that from guaranteeing suitable strength and toughness coupling angle preferred N content is controlled at 0.0060%～0.0080% scope.
5. B is an effective element of guaranteeing hardenability, but add toughness is descended.
Consider that from guaranteeing best hardenability and toughness coupling angle preferred B content is controlled at 0.0008%～0.0015% scope.
6. the almost consistent harmful element that is considered to of P, S, they have very strong segregation tendency, easily assemble on crystal boundary.Therefore, preferably reduce its content as much as possible.Preferably below 0.02%.
Because adopt above measure, the present invention has economy and safe over-all properties, can be widely used in the demanding mechanical fields of production security such as coal mine hydraulic supporting.
Hydraulic prop seamless steel pipe steel of the present invention is compared with existing 27SiMn hydraulic prop seamless steel pipe steel has following advantage:
1. hydraulic prop seamless steel pipe steel of the present invention has high strength and high impelling strength, also has good hardenability simultaneously.
The over-all properties of hydraulic prop seamless steel pipe steel 2. of the present invention: yield strength σ
s: 750～800N/mm
2, tensile strength sigma
b: 870～1000N/mm
2, unit elongation δ: 15～20%, relative reduction in area ψ: 50～65%, Charpy-V impact power A
KU2:-20 ℃ of 50～60J
The present invention compares with the existing Cr of containing, Mo non-tempering seamless steel tube, has following advantage:
1. need not expensive Mo, V, Cr alloy production, reduce cost, and keep high strength and high tenacity.
2. N, Ti, Nb are controlled in the littler scope, but reach good economy and safe over-all properties.
Embodiment:
The steel of the chemical ingredients shown in the melting table 1, be cast into steel ingot after, above-mentioned steel ingot is heated to 1220 ℃～1260 ℃, be rolled into weldless steel tube.Concrete operational path is high-quality steel scrap+pig iron → electrosmelting → LF stove refining (VD vacuum refinement), adjusts Nb, B, Ti, C, Si, Mn composition → die casting → 508 tube rollings during refining.
This weldless steel tube is through Overheating Treatment, and its thermal treatment process is: 920 ℃ of insulation 90min, shrend, 530 ℃ of insulation 120min, water-cooled.Obtain the comprehensive mechanical performance of table 2.
In the table 1, sample sequence number 1～5th, the chemical ingredients of the embodiment of the invention, sample sequence number 6～8th, comparative example chemical ingredients.
This weldless steel tube is through Overheating Treatment, and its thermal treatment process is: 920 ℃ of insulation 90min, shrend, 530 ℃ of insulation 120min, water-cooled.Obtain the comprehensive mechanical performance of table 2.
Table 1 embodiment and comparative example chemical ingredients (%)
Table 2 embodiment and comparative example comprehensive mechanical performance
Table 3 embodiment and comparative example welding property
In the table 1, sample sequence number 1～7th, the chemical ingredients of the embodiment of the invention.Sample sequence number 8～10th, the comparative example chemical ingredients.
In the table 2.Sample sequence number 1～7th, the present invention's example comprehensive mechanical performance, the minimum 750N/mm2 that also surpasses of yield strength is up to 825N/mm2, the minimum 870N/mm2 that also surpasses of tensile strength is up to 1025N/mm2, so, even if high strength also can be guaranteed more than 55J with the toughness of impact value evaluation.Sample sequence number 8～10th, the comparative example comprehensive mechanical performance, high-yield strength 590N/mm2, maximum pulling strength 790N/mm2, the highest 33J of toughness so that impact value is estimated can not satisfy the requirement of high strength and high tenacity.
In the table 3.Sample sequence number 1～7th, the welding property of example of the present invention: surface crack rate, root crack rate are 0%, section crack rate average is 9.04%.Sample sequence number 8～10th, the welding property of comparative example: surface crack rate average is 0.87%, root crack rate average is 1.23%, and section crack rate average is 22.48%.The welding property of example obviously is better than the welding property of comparative example.
As mentioned above, adopt the present invention, acquisition high strength that can be economic and high impelling strength hydraulic prop seamless steel pipe also have good hardenability simultaneously.
Claims (7)
1. high-strength tough hydraulic prop seamless steel pipe, it is characterized in that % by weight, contain C:0.15%-0.35%, Si:0.10%-0.60%, Mn:1.00%-2.00%, Nb:0.02%-0.07%, Al:0.01%-0.06%, Ti:0.02%-0.12%, below the P:0.025%, below the S:0.025%, below the O:0.0035%, surplus is made up of iron and impurity, final rolling temperature is 1220 ℃-1260 ℃ in the tubulation operation, weldless steel tube is through Overheating Treatment, its thermal treatment process is: 920 ℃ of insulation 90min, shrend, 530 ℃ of insulation 120min, water-cooled.
2. high-strength tough hydraulic prop seamless steel pipe as claimed in claim 1, it is characterized in that % is made up of following ingredients by weight: below C:0.20%-0.28%, Si:0.25%-0.45%, Mn:1.55%-1.70%, Nb:0.03%-0.05%, Al:0.01-0.05%, Ti:0.02%-0.06%, the P:0.02%, below the S:0.02%, below the O:0.0035%, surplus is made of Fe and impurity.
3. high-strength tough hydraulic prop seamless steel pipe as claimed in claim 2, it is characterized in that with part Fe by weight % be replaced as B:0.0005%-0.002%.
4. high-strength tough hydraulic prop seamless steel pipe as claimed in claim 2, it is characterized in that with part Fe by weight % be replaced as N:0.0050%-0.0100%.
5. high-strength tough hydraulic prop seamless steel pipe as claimed in claim 2 is characterized in that a part a kind or the 2 kinds of replacements selecting of % by weight with Fe from B:0.0008%-0.0015%, N:0.0060%-0.0080%.
6. high-strength tough hydraulic prop seamless steel pipe as claimed in claim 2 is characterized in that the carbon equivalent Ceq. (%) of this steel is 0.32%～0.68%, Ceq=C+Mn/6.
7. high-strength tough hydraulic prop seamless steel pipe as claimed in claim 6 is characterized in that carbon equivalent Ceg:(%) be 0.44%-0.56%, Ceq=C+Mn/6.
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| CN2008100443818A CN101280391B (en) | 2008-05-08 | 2008-05-08 | High-strength tough hydraulic prop seamless steel pipe |
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|---|---|---|---|
| CN2008100443818A CN101280391B (en) | 2008-05-08 | 2008-05-08 | High-strength tough hydraulic prop seamless steel pipe |
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| CN101280391B true CN101280391B (en) | 2010-06-02 |
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| CN108588552A (en) * | 2018-03-27 | 2018-09-28 | 衡阳华菱连轧管有限公司 | Steel pipe, its raw material, its production method and rotary drilling rig drilling rod |
| CN108531805A (en) * | 2018-03-27 | 2018-09-14 | 衡阳华菱连轧管有限公司 | Steel pipe, its raw material, its production method and rotary drilling rig drilling rod |
| CN112575243A (en) * | 2019-09-27 | 2021-03-30 | 宝山钢铁股份有限公司 | High-strength anti-fatigue seamless steel tube and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1940108A (en) * | 2005-09-29 | 2007-04-04 | 宝山钢铁股份有限公司 | Superhigh-strength cold rolling band steel with anti-tensile strength above 880Mpa and its production |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1940108A (en) * | 2005-09-29 | 2007-04-04 | 宝山钢铁股份有限公司 | Superhigh-strength cold rolling band steel with anti-tensile strength above 880Mpa and its production |
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