CN100359035C - X65 pipeline steel for use in acid condition and its making process - Google Patents
X65 pipeline steel for use in acid condition and its making process Download PDFInfo
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Abstract
The present invention relates to an X65 pipeline steel used in an acid environment. The X65 pipeline steel comprises 0.02 mass % to 0.05 mass % of C, 1.20 mass % to 1.50 mass % of Mn, 0.10 mass % to 0.50 mass % of Si, at most 0.0020 mass % of S, 0.004 mass % to 0.012 mass % of P, 0.05 mass % to 0.07 mass % of Nb, 0.005 mass % to 0.025 mass % of Ti, 0.050 mass % to 0.195 mass % of Mo, at most 0.35 mass % of Cu, at most 0.35 mass % of Ni, at most 0.0080 mass % of N, 0.0015 mass % to 0.0045 mass % of Ca, and at most 2.0 mass % of Ca/S. The manufacturing method comprises the following steps: smelting with a revolving furnace or an electric furnace; secondary refining, carrying out LF desulfurization, RH vacuum degassing, and processing Ca; continuously casting; controlling rolling, and carrying out hot rolling and rough rolling with the final temperature of 940 to 1020 DEG C and the fine rolling final temperature of 780 to 840 DEG C; coiling, with the coiling temperature of the coil of 500 to 580 DEG C. The X65 pipeline steel has low manufacturing cost and is easier to produce. The X65 pipeline steel has anti-HIC performance, and has better anti-dynamic tear resistance and higher impact toughness, which is more favorable for the safety of the operation of a high-pressure gas pipeline.
Description
Technical field
The present invention relates to metallic substance and plastic working field, particularly line steel hot rolling coiled sheet and manufacture method thereof.
Background technology
Most countries transfer oil, Sweet natural gas are all followed API API 5L standard with steel pipe at present, and propose to replenish requirement according to concrete pipe engineering needs based on this.For making hot-rolled sheet coil or the logical pipe line steel that is referred to as of steel plate that this type of welded tube is used.Pipe line steel is the long important materials of using apart from the transport gas pipe engineering.Along with the adjustment of energy structure, the increase of Natural Gas Demand, greatly promoted the development of High Pressure Gas Transmitting Pipeline.Transport gas pipeline steel and maximum different be of liquid lines such as transfer oil with steel, the transport gas pipeline steel not only claims to the intensity of steel; Contain acid cure hydrogen (H in conveying
2S) under the Sweet natural gas environment of medium, be the destruction that prevents that hydrogen sulfide from causing pipeline, then require pipe line steel to have anti-HIC (Hydrogen Induced Crack hydrogen lures crackle) performance requriements; When the high-pressure delivery natural gas line,, also require steel for gas delivering pipeline to have high anti-dynamic tear energy power (DWTT) and high low-temperature flexibility (CVN) for guaranteeing the transport gas pipeline safety.Therefore, the X 65 pipeline steel for use in acid condition with good anti-dynamic tear resistance is the important steel of using of carrying the sour natural gas pipeline.
As Chinese publication number 1351189 disclosed " a kind of Ultra-low carbon high tenacity anti-H 2 S steel for gas delivering pipeline " (contrast patent 1), all very low (P≤0.003% of S wherein, P content requirement, S≤0.007%), this is except increasing manufacturing cost, and manufacture difficulty is very big, and present suitability for industrialized production also is difficult to realize; In addition, contain the Mo of high level, contain V element, do not carry out little Ti processing and Ca and handle.In its production technique, the final cooling temperature that rolls postcooling is lower, and the reeling machine Capability Requirement that thick specification pipe line steel coiled sheet is produced is very high.
Also just like Japanese patent laid-open 6-81034 disclosed " good anti-HIC steel pipe hot rolled strip manufacture method " (contrast patent 2), the component prescription and the manufacture method of the line steel hot rolling band steel of its API X52～X70 with anti-HIC performance, it is the manufacturing at the HIC resistance pipeline steel band steel of X52～X70 grade of steel, what adopt is low-carbon (LC), the composition design philosophy of low manganese, C content in the example is all 0.05～0.08%, satisfy X65 grade of steel intensity (both yield strength 〉=65000psi in the example, be equivalent to 448MPa) composition of example or contain 0.03～0.10% V, and coiling temperature is all less than 500 ℃; On the technology,,, the elimination component segregation is higher than 1250 ℃ of Heating temperatures for adopting because C content is higher, this increases energy consumption, improve manufacturing cost and to the pressure of environmental protection, and the austenite crystal when easily causing heating is thick, thick toughness and the anti-dynamic tear resistance to pipe line steel of crystal grain is unfavorable; And, its not mentioned toughness and anti-dynamic tear resistance.
Summary of the invention
Purpose of the present invention is by specific alloy formula, be aided with suitable complete processing, recrystallization zone by the roughing milling train is rolling, the controlled rolling of non-recrystallization district and the controlled cooling technology of finish rolling tandem rolling unit, and production has the X65 line steel hot rolling coiled sheet of anti-HIC performance, good anti-dynamic tear resistance and high tenacity.
For achieving the above object, technical solution of the present invention is, X 65 pipeline steel for use in acid condition, and its composition quality per-cent is:
C 0.02～0.05
Mn 1.20～1.50
Si 0.10～0.50
S ≤0.0020
P 0.004～0.012
Nb 0.05～0.07
Ti 0.005～0.025
Mo 0.050～0.195
Cu ≤0.35
Ca 0.0015～0.0045
Ca/S ≥2.0
All the other are iron and inevitable impurity.
Also comprise among Cu, the Ni one or more; Cu≤0.35, Ni≤0.35.
The manufacture method of X 65 pipeline steel for use in acid condition hot-rolled sheet coil of the present invention comprises the steps:
A. converter or electrosmelting,
B. external refining, LF desulfurization+RH vacuum outgas, Ca handle,
C. continuous casting,
D. controlled rolling, hot rolling, roughing final temperature: 940～1020 ℃; The finish rolling final temperature: 780～840 ℃,
E. batch, the coiled sheet coiling temperature is 500～580 ℃.
Wherein, Ca/S 〉=2.0 during Ca handles among the described step b.
The pouring temperature of continuous casting among the described step c: 1575 ± 15 ℃.
Slab heating temperature is 1150～1199 ℃ before the described steps d hot rolling.
Described steps d hot rolling postcooling speed is greater than 5 ℃/s.
The mechanism that produces according to HIC as can be known, environmental factorss such as the acidity of gas medium and operating pressure are the external causes that HIC produces; The factors such as interface of the non-metallic inclusion in the steel, defective, different tissues then are the internal causes that produces HIC.External cause is by interior thereby work.Under the certain condition of external cause, the problem that solve pipe line steel HIC has only by the internal cause aspect and considers.The generation of HIC relates to the transformation to hydrogen molecule of diffusion, gathering and the hydrogen atom of hydrogen atom, by hindering the carrying out of these processes, all can improve the anti-HIC performance of pipe line steel.
In the high-pressure delivery natural gas line, the diffusion of hydrogen atom is inevitable, and the anti-HIC performance that improve pipe line steel mainly is that the gathering place that reduces hydrogen atom improves in the matrix survivability of hydrogen atom when hydrogen molecule changes with the matrix obdurability that improves steel.The general easy non-metallic inclusion, the gathering at the interface of different tissues in steel of hydrogen atom, therefore, the interface of reducing non-metallic inclusion, defective, different tissues is to reduce hydrogen atom accumulative effective measure.The interface that unavoidably also can have certain non-metallic inclusion and different tissues in the invar, by same object volume as can be known, also be the effective measure that can improve the anti-HIC performance of steel with banded structure in the steel or non-metallic inclusion nodularization in the principle of the surface-area minimum of spherical state as far as possible.Simultaneously, volume fraction one timing at nonmetallic inclusionsin steel, defective or different tissues improves its dispersity, can reduce the aggregate amount of hydrogen atom habitat, can reduce this and be in the destructive force of hydrogen atom when hydrogen molecule changes, thus the anti-HIC ability of raising steel.
Therefore, the key of producing HIC resistance pipeline steel is the inclusion that as far as possible reduces in the steel, and makes the remaining strip sulfide inclusion of the minute quantity that present smelting level also can't remove all be converted into nodule, and reduces the banded structure in the steel.For making the strip sulfide inclusion in the steel be converted into nodule, usually can adopt Ca to handle or the rare earth processing, but in the international bid file of many pipe line steels, clearly stipulate in recent years not allow to use rare earth to handle, thereby the Ca processing just becomes the abnormal treatment process of at present general in the world inclusion.For making all metamorphosis of sulfide in the steel, require the Ca/S ratio greater than 2.0.Ca is handled steel, and Ca content is generally 0.0015～0.0045%, and like this, the S content of HIC resistance pipeline steel is 0.002% o'clock, and Ca content needs 〉=0.0040%; When Ca is 0.0015%, then sulphur necessary≤0.0007% can satisfy Ca/S greater than 2.0 requirement.Fig. 1 is the relation of S content in the HIC resistance pipeline steel, Ca/S and HIC crack length rate, therefrom as seen, reduces S content and certain Ca/S than the anti-HIC performance that can obviously improve pipe line steel.
Banded pearlitic structure is to cause pipe line steel to produce another major reason of HIC, so the microstructure of pipe line steel must eliminate the banded perlite in the steel, preferably is monophasic low-carbon (LC) acicular ferrite (or low-carbon bainite) tissue.Obtain this tissue, depend primarily on the control of design of chemical composition, rolling technology, hot rolling postcooling speed and coiling temperature.Pearlitic structure is a kind of high-temperature phase-change product, can roll postcooling speed and coiling temperature is avoided banded pearlitic generation by control.The phase-change characteristic that also can change steel by the alloying of Mo is to reach the purpose that obtains acicular ferrite structure.
Principal element has the effect of following several respects in the HIC resistance pipeline steel:
Carbon: be strengthening element most economical, the most basic in the steel, effect by solution strengthening and precipitation strength has tangible effect to the intensity that improves steel, but the raising of C content has negative impact to ductility, toughness and the weldability of steel, C also promotes pearlitic formation, HIC is unfavorable in antagonism, therefore by reducing the welding property that C content not only helps to improve steel, also help to improve the toughness and the anti-HIC performance of steel.This patent C content is controlled at 0.02～0.05% scope
Manganese: being the intensity that improves steel by solution strengthening, is that compensation reduces the main and most economical strengthening element that causes loss of strength in the pipe line steel because of C content.Mn still enlarges the element of γ phase region, can reduce the γ → α transformation temperature of steel, helps to obtain tiny phase-change product, can improve toughness, the reduction ductile-brittle transition temperature of steel.Mn also promotes pearlitic formation, in order to reduce the content of pearlite in alloy in the steel, will note the balance of C, Mn in the composition design of HIC resistance pipeline steel.This patent is under the situation of ultralow C, and Mn content is controlled at 1.2～1.5%.
Niobium: the effect to grain refining is fairly obvious, separate out the austenitic answer of obstruction deformation, recrystallize by the strain inducing of NbC in the course of hot rolling, when controlled rolling and controlled chilling make the rolling deformation austenite structure in non-recrystallization zone of finish rolling stage in phase transformation, change tiny phase-change product into, make steel have high intensity and high toughness.Nb also improves the intensity of steel by precipitation strength.The solid solubility of Nb in high temperature austenite when reducing C content and can improve the slab reheat can be given full play in the controlled rolling process subsequently Nb to the effect of grain refining and precipitation strength.So this patent is under ultralow C content, Nb is controlled at 0.05～0.07%.
Titanium: Ti is strong solid N element, and Ti is the N in the steel fixedly, can form the TiN precipitated phase of tiny high-temperature stable when sheet billet continuous casting.Austenite crystal when this tiny TiN particle can hinder the slab reheat is effectively grown up, and to improving welded heat affecting zone impelling strength obvious effect is arranged.Ti content is controlled at 0.005～0.025% and can satisfies and carry out little Ti processing requirements under N≤0.0080% situation in this patent.
Molybdenum: be to enlarge the γ phase region, separate out ferrite earlier when postponing γ → α phase transformation and form, promote the principal element that acicular ferrite forms, phase-change organization plays an important role to control, adds 0.1～0.2% Mo in the Ultra-low carbon pipe line steel and just can obtain tangible acicular ferrite structure under certain cooling conditions and coiling temperature.
Sulphur, phosphorus: be unavoidable impurities element in the steel, it is low more good more to wish.By super low sulfur (less than 20ppm) and Ca processing sulfide is carried out inclusion morphology control, can make pipe line steel have high impelling strength and good anti-HIC performance.Phosphorus is the strong element of a kind of segregation, and general pipe line steel requires phosphorus content less than 150ppm, requires phosphorus content less than 120ppm to HIC resistance pipeline steel.By falling C, reducing perlite and increase and roll the back cooling rate and all help to reduce the negative impact of phosphorus to the HIC performance.
Copper, nickel: can improve the intensity of steel by the effect of solution strengthening, Cu also can improve the solidity to corrosion of steel simultaneously, and the adding of Ni mainly is to improve the red brittleness that Cu easily causes in steel, and useful to toughness.Also can compensate the strength degradation that the increase because of pipe line steel thickness causes.
For X65 grade of steel HIC resistance pipeline steel, for avoiding under C content condition with higher coming proof strength to cause the component segregation of steel and produce banded pearlitic structure or as some hard phase constitutions such as martensites with improving the Mn content method, this patent then adopts ultralow C content (C=0.02～0.05%), Mn is 1.2～1.5%, control tissue inter-variable in conjunction with the Nb microalloying with by the low alloying of Mo, and suitably add a small amount of Cu, alloying elements such as Ni have high intensity to guarantee steel, good anti-HIC performance, good anti-low-temperature dynamic tear resistance and high low-temperature flexibility are design philosophy.
Anti-HIC performance X65 pipe line steel coiled sheet with good anti-dynamic tear resistance can be used for making the pipeline steel tube of carrying acidic medium, and its good anti-HIC performance and anti-dynamic tear resistance have vital role to the security that guarantees the high pressure line transportation.
Beneficial effect of the present invention
S, P content requirement all very low (P≤0.003%, S≤0.007%) in the contrast patent 1, this is except the increase manufacturing cost, and manufacture difficulty is very big, and present suitability for industrialized production also is difficult to realize; In addition, contain the Mo of high level, contain V element, do not carry out little Ti processing and Ca and handle.But this patent is made angle from suitability for industrialized production, S, P foreign matter content are controlled at suitable low-level, adopt Ca to handle the disadvantageous effect that reduces sulfide, adopt low relatively Mo content can reduce cost of alloy, but the more Nb content of ultralow C content solid solution under the high temperature austenite temperature, suitably improve Nb content and cancel V element, simplifying the alloying constituent system is convenient to produce, improve the controlled rolling effect that Nb content can improve pipe line steel simultaneously, improve the effect of crystal grain thinning, help improving the anti-dynamic tear resistance of pipe line steel.This patent compares with " contrast patent 1 " on technology, has lower slab heating temperature, austenite crystal is grown up in the time of can avoiding reheat so on the one hand, favourable to the toughness and the anti-dynamic tear resistance that improve pipe line steel, energy consumption be can reduce on the other hand, environmental protection and resources effective utilization helped; The final cooling temperature that rolls postcooling in " contrast patent 1 " is lower, the reeling machine Capability Requirement that thick specification pipe line steel coiled sheet is produced is very high, and the coiling temperature span of control of this patent is easier to realize on producing, this patent adopts low relatively finishing temperature, can improve the anti-dynamic tear resistance of pipe line steel.Not mentioned anti-dynamic tear resistance in " contrast patent 1 ", and this performance is important to High Pressure Gas Transmitting Pipeline.
Contrast patent 2 is the manufacturings at the HIC resistance pipeline steel band steel of X52～X70 grade of steel, what adopt is the composition design philosophy of low-carbon (LC), low manganese, C content in the example is all 0.05～0.08%, and this patent employing C content is 0.02～0.05% Ultra-low carbon content design, can reduce the segregation of C like this, improve anti-HIC performance, and can have higher toughness and better weldability; But owing to the more Nb content of ultralow C content solid solution under austenitizing temperature, so this patent adopts higher Nb content design (Nb=0.05～0.07%), improving Nb content can increase the effect of the controlled rolling of pipe line steel, and crystal grain thinning improves toughness and anti-performance of dynamically tearing.On technology in " contrast patent 2 " because C content is higher, for adopting, the elimination component segregation is higher than 1250 ℃ of Heating temperatures, this increases energy consumption, improve manufacturing cost and to the pressure of environmental protection, and causing that easily the austenite crystal when heating is thick, thick toughness and the anti-dynamic tear resistance to pipe line steel of crystal grain is unfavorable; This patent adopts low relatively Heating temperature and relative low finishing temperature owing to adopt ultralow C content design, helps improving anti-dynamic tear resistance like this.Not mentioned toughness and anti-dynamic tear resistance in " contrast patent 2 ".Satisfy the composition of X65 grade of steel intensity (both yield strength 〉=65000psi was equivalent to 448MPa) example or contain 0.03～0.10% V in the example of " contrast patent 2 ", and coiling temperature is all less than 500 ℃.The coiling temperature of this patent is 500～580 ℃ of scopes, and this is easier to realize on producing.
Chemical ingredients of the present invention relatively sees Table 1 with the contrast patent.Technology of the present invention relatively sees Table 2 with the contrast patent.
The performance of the line steel hot rolling coiled sheet of producing according to technical solution of the present invention reaches following requirement:
1. tensile property:
σ
0.5＝470～570MPa，σ
b≥535MPa，σ
0.5/σ
b≤0.92。
2.V type notch shock performance:
Test temperature-20 ℃, 10 * 10 * 55mm, the ballistic work mean value 〉=300J of v-notch sample, shear area 100%.
3.DWTT performance:
Test temperature-15 ℃, shear area 100%
4. hardness test: (transverse section hardness)
Hv10≤240。
5. metallographic structure:
Grain fineness number (ASTM E112): 10 grades or thinner.Be organized as acicular ferrite+polygonal ferrite+a small amount of MA constituent element.
6. anti-HIC performance
Target: press NACE TM0284-96 standard, (contain saturated H at A solution respectively
2The 5%NaCl+0.5%CH of S
3COOH solution, PH=3.0) (the artificial seawater solution that contains saturated H2S, PH=5.0) test conditions soaks test sample after 96 hours down, all satisfies crack length rate CLR≤15%, crack thickness rate CTR≤5%, the responsive rate CSR of crackle≤2% with B solution.
Therefore, the present invention all has different on composition and technology compared with the prior art.The present invention has lower manufacturing cost, and easier realization production also has the impelling strength of better anti-dynamic tear resistance and Geng Gao when having anti-HIC performance, so more help to guarantee the security of high pressure gas pipeline road operation.
The present invention is used to make the line steel hot rolling coiled sheet of API 5L standard X65 grade of steel welded tube by the production of hot continuous rolling unit with continuously cast bloom, in the good anti-HIC performance that satisfies crack length rate (CLR)≤15% under the NACETM0284-96 standard conditions, crack thickness rate (CTR)≤5%, the responsive rate of crackle (CSR)≤2% requirement under the requirement of the strength level that satisfies the X65 grade of steel, having-15 ℃ of fracture shear area that reflect the DWTT drop weight test of anti-dynamic tear resistance down simultaneously is 100%, has the high tenacity of-20 ℃ of Charpy-V impact powers more than 300J.The hot-rolled sheet coil that manufactures and designs can be made spiral submerged welded pipe, also can be applied to make longitudinal welded pipe.Other patent relatively, it have cost lower, be easier to manufacture, performance is better, range of application is wider advantage.
X65 pipe line steel with good anti-anti-HIC of dynamic tear resistance is the super low carbon microalloy steel of controlled rolling and controlled chilling, is the important steel that this century, gas transmission line was used, and has excellent anti-HIC performance, good anti-dynamic tear resistance and high tenacity.
Table 1
| Composition | C | Mn | Si | S | P | Nb | Ti | V | Mo | Cu | Ni | N | Ca | Ca/S |
| The present invention | 0.02～ 0.05 | 1.20～ 1.50 | 0.10～ 0.50 | ≤0.0020 | 0.004～ 0.012 | 0.05～ 0.07 | 0.005～ 0.025 | Do not have | 0.50～ 0.195 | ≤0.35 | ≤0.35 | ≤ 0.0080 | 0.0015 ～ 0.0045 | ≥2.0 |
| Contrast patent 1 | 0.02～ 0.04 | 1.4～ 1.6 | 0.15～ 0.35 | ≤0.0007 | ≤0.003 | 0.03～ 0.05 | ---- | 0.02～ 0.04 | 0.2～0.4 | ---- | ---- | ---- | ---- | ---- |
| Contrast patent 2 | ≤0.08 | 0.8～ 1.4 | 0.15～ 0.35 | ≤0.0020 | ≤0.015 | 0.01～ 0.05 | 0.01～ 0.04 | ≤0.10 | ≤0.30 | ≤0.35 | ≤0.30 | ---- | 0.0015 ～ 0.0035 | ≥2.0 |
Table 2 the present invention and the comparison (wt%) that contrasts patent
| Technology | Heating temperature ℃ | Finishing temperature ℃ | Roll postcooling speed ℃/s | Coiling temperature ℃ |
| The present invention | 1150～1199 | 780～840 | ≥5 | 500～580 |
| Contrast patent 1 | 1200 | 830～900 | 15～30 | 400～500 (final cooling temperatures) |
| Contrast patent 2 | ≥1250 | ≥850 | 5～25 | 450～550 |
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Fig. 2 is the relation of S content in the HIC resistance pipeline steel, Ca/S and HIC crack length rate.
Fig. 3 is the typical acicular ferrite metallographic structure of X65 HIC resistance pipeline steel.
Embodiment
Embodiment sees Table 3, and concrete processing parameter sees Table 4, and table 5 is the mechanical property of the X65 HIC resistance pipeline roll of steel plate of the embodiment of the invention; Table 6 is the anti-HIC performance of the X65 HIC resistance pipeline roll of steel plate of tie element and technology.
Operational path is referring to Fig. 1: i.e. LD converter smelting → external refining (LF desulfurization, RH vacuum outgas, feed silk Ca handle) → continuous casting → slab reheat → controlled rolling → controlled chilling → batch.
Table 3
| Sequence number | C | Si | Mn | P | S | Cu | Ni | Nb | Ti | Mo | Ca | N | Ca/S |
| 1 | 0.020 | 0.10 | 1.41 | 0.008 | 0.0010 | 0.22 | 0.13 | 0.057 | 0.005 | 0.15 | 0.0026 | 0.0025 | 2.6 |
| 2 | 0.039 | 0.20 | 1.49 | 0.004 | 0.0006 | 0.35 | 0.14 | 0.053 | 0.010 | 0.05 | 0.0015 | 0.0040 | 2.5 |
| 3 | 0.037 | 0.21 | 1.50 | 0.006 | 0.0006 | 0.18 | 0 18 | 0.060 | 0.016 | 0.13 | 0.0030 | 0.0028 | 5.0 |
| 4 | 0.039 | 0.40 | 1.49 | 0.008 | 0.0010 | 0.21 | 0.13 | 0.051 | 0.015 | 0.15 | 0.0022 | 0.0035 | 2.2 |
| 5 | 0.036 | 0.20 | 1.48 | 0.006 | 0.0005 | 0.21 | 0.17 | 0.054 | 0.016 | 0.16 | 0.0025 | 0.0080 | 5.0 |
| 6 | 0.027 | 0.50 | 1.49 | 0.006 | 0.0010 | 0.28 | 0.13 | 0.053 | 0.025 | 0.18 | 0.0020 | 0.0060 | 2.0 |
| 7 | 0.036 | 0.14 | 1.48 | 0.005 | 0.0014 | 0.18 | 0.20 | 0.050 | 0.018 | 0.15 | 0.0035 | 0.0049 | 2.5 |
| 8 | 0.050 | 0.22 | 1.20 | 0.012 | 0.0020 | 0.17 | 0.15 | 0.052 | 0.008 | 0.195 | 0.0045 | 0.0020 | 2.2 |
| 9 | 0.040 | 0.21 | 1.46 | 0.006 | 0.0009 | --- | 0.35 | 0.052 | 0.016 | 0.15 | 0.0022 | 0.0032 | 2.4 |
| 10 | 0.032 | 0.31 | 1.37 | 0.007 | 0.0006 | --- | --- | 0.070 | 0.021 | 0.12 | 0.0021 | 0.0035 | 3.5 |
Table 4
| Sequence number | Heating temperature ℃ | Roughing end temp ℃ | Finish rolling finishing temperature ℃ | Roll postcooling speed ℃/S | Coiling temperature ℃ |
| 1 | 1183 | 960 | 838 | 7 | 539 |
| 2 | 1185 | 978 | 823 | 7 | 580 |
| 3 | 1180 | 980 | 822 | 10 | 500 |
| 4 | 1185 | 956 | 835 | 9 | 548 |
| 5 | 1199 | 968 | 833 | 9 | 541 |
| 6 | 1183 | 986 | 840 | 8 | 548 |
| 7 | 1178 | 979 | 809 | 9 | 552 |
| 8 | 1150 | 940 | 780 | 14 | 523 |
| 9 | 1182 | 988 | 822 | 5 | 534 |
| 10 | 1188 | 1020 | 795 | 6 | 522 |
Table 5
As can be seen from Table 5, the present invention can satisfy the pipe line steel of X65 well, has very high toughness, and-20 ℃ less than 300J, very high anti-HIC ability, and at-15 ℃, the fracture area (SA%) of chapping is 100.
Table 6
| HIC (hydrogen lures crackle) touchstone: NACE TM0284-96 standard, H 2The S saturated solution soaked 96 hours | ||||||
| A solution (contains saturated H 2The 5%NaCl+0.5% CH of S 3COOH solution, PH=3.0) | B solution (the artificial seawater solution that contains saturated H2S, PH=5.0) | |||||
| Sequence number | Crack length rate CLR% | Crack thickness rate CTR% | The responsive rate CSR% of crackle | Crack length rate CLR% | Crack thickness rate CTR% | The responsive rate CSR% of crackle |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | 0 | 0 | 0 | 0 | 0 | 0 |
| 3 | 0 | 0 | 0 | 0 | 0 | 0 |
| 4 | 0 | 0 | 0 | 0 | 0 | 0 |
| 5 | 0 | 0 | 0 | 0 | 0 | 0 |
| 6 | 0 | 0 | 0 | 0 | 0 | 0 |
| 7 | 0 | 0 | 0 | 0 | 0 | 0 |
| 8 | 0 | 0 | 0 | 0 | 0 | 0 |
| 9 | 0 | 0 | 0 | 0 | 0 | 0 |
| 10 | 0 | 0 | 0 | 0 | 0 | 0 |
As can be seen from the table, pipe line steel flawless of the present invention shows to have good anti-HIC performance.
The embodiment that carries out according to the present invention can estimate this invention under the situation that appointed condition allows, and production operation is more easily carried out, and has certain possibility of applying.Especially in recent years the increase of the adjustment of energy structure, Natural Gas Demand has greatly promoted the development of High Pressure Gas Transmitting Pipeline.From considering the operation stability and the security of transport pipe, length has proposed more strict requirement apart from the high-pressure delivery natural gas line to the pipe line steel performance.The transport gas pipeline steel not only claims to the intensity of steel; Contain in conveying under the Sweet natural gas environment of acid cure hydrogen medium, be the destruction that prevents that hydrogen sulfide from causing pipeline, then require pipe line steel to have anti-HIC (Hydrogen Induced Crack hydrogen lures crackle) performance requriements.When the high-pressure delivery natural gas line,, also require steel for gas delivering pipeline to have high anti-dynamic tear energy power and high low-temperature flexibility for guaranteeing the transport gas pipeline safety.Therefore, the X 65 pipeline steel for use in acid condition with good anti-dynamic tear resistance is the important steel of using of carrying the sour natural gas pipeline, and has bigger application prospect.
Claims (7)
1. X 65 pipeline steel for use in acid condition, its composition quality per-cent is:
C 0.02～0.05
Mn 1.20～1.50
Si 0.10～0.50
S ≤0.0020
P 0.004～0.012
Nb 0.05～0.07
Ti 0.005～0.025
Mo 0.050～0.195
N ≤0.0080
Ca 0.0015～0.0045
Ca/S ≥2.0
All the other are iron and inevitable impurity.
2. X 65 pipeline steel for use in acid condition as claimed in claim 1 is characterized in that, also comprises among Cu, the Ni one or more, Cu≤0.35, Ni≤0.35.
3. the manufacture method of X 65 pipeline steel for use in acid condition hot-rolled sheet coil as claimed in claim 1 is characterized in that, comprises the steps:
A. converter or electrosmelting,
B. external refining, LF desulfurization+RH vacuum outgas, Ca handle,
C. continuous casting,
D. controlled rolling, hot rolling, roughing final temperature: 940～1020 ℃; The finish rolling final temperature: 780～840 ℃, the finish rolling total deformation is greater than 70%;
E. cool off, batch, the coiled sheet coiling temperature is 500～580 ℃.
4. the manufacture method of X65 line steel hot rolling coiled sheet as claimed in claim 3 is characterized in that, Ca/S 〉=2.0 during Ca handles among the described step b.
5. the manufacture method of X65 line steel hot rolling coiled sheet as claimed in claim 3 is characterized in that, the pouring temperature of continuous casting among the described step c: 1575 ± 15 ℃.
6. the manufacture method of X65 line steel hot rolling coiled sheet as claimed in claim 3 is characterized in that, slab heating temperature is 1150～1199 ℃ before the described steps d hot rolling.
7. the manufacture method of X65 line steel hot rolling coiled sheet as claimed in claim 3 is characterized in that, described steps d hot rolling postcooling speed is greater than 5 ℃/s.
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Cited By (1)
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|---|---|---|---|---|
| US20210054473A1 (en) * | 2018-03-19 | 2021-02-25 | Tata Steel Limited | Steel composition in accordance with api 5l psl-2 specification for x-65 grade having enhanced hydrogen induced cracking (hic) resistance, and method of manufacturing the steel thereof |
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| CN110004364B (en) * | 2019-04-15 | 2021-05-28 | 邯郸钢铁集团有限责任公司 | Large loading stress sulfide corrosion resistant X52MS hot-rolled plate coil and manufacturing method thereof |
| CN111299533A (en) * | 2020-04-03 | 2020-06-19 | 武汉钢铁有限公司 | Method for improving castability of ultra-low carbon steel produced by billet continuous casting machine |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0681034A (en) * | 1992-08-31 | 1994-03-22 | Sumitomo Metal Ind Ltd | Production of hot rolled steel strip for steel pipe excellent in hic resistance |
| JPH06306530A (en) * | 1993-04-26 | 1994-11-01 | Nippon Steel Corp | Low-medium strength uoe line pipe excellent in sulfide stress cracking resistance in weld zone |
| JPH08232042A (en) * | 1994-12-27 | 1996-09-10 | Sumitomo Metal Ind Ltd | Corrosion resisting steel for resistance welded tube |
| JPH0931595A (en) * | 1995-07-25 | 1997-02-04 | Sumitomo Metal Ind Ltd | Corrosion resisting steel for electric resistance welded tube, excellent in toughness at low temperature, and its production |
| JPH09263831A (en) * | 1996-01-22 | 1997-10-07 | Nippon Steel Corp | Production of extra thick high strength bent pipe excellent in toughness at low temperature |
| KR20020027013A (en) * | 2000-10-04 | 2002-04-13 | 이구택 | Steel plate for API-X65 grade line pipe guaranteed stress relief and method of manufacturing them |
| JP2003226922A (en) * | 2001-11-29 | 2003-08-15 | Jfe Steel Kk | Manufacturing method for high strength steel sheet having excellent hic resistance |
| CN1142309C (en) * | 2000-11-01 | 2004-03-17 | 中国科学院金属研究所 | Ultravlow-carbon high-toughness steel resisting hydrogen sulfide for gas deliver pipeline |
-
2005
- 2005-01-26 CN CNB2005100236513A patent/CN100359035C/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0681034A (en) * | 1992-08-31 | 1994-03-22 | Sumitomo Metal Ind Ltd | Production of hot rolled steel strip for steel pipe excellent in hic resistance |
| JPH06306530A (en) * | 1993-04-26 | 1994-11-01 | Nippon Steel Corp | Low-medium strength uoe line pipe excellent in sulfide stress cracking resistance in weld zone |
| JPH08232042A (en) * | 1994-12-27 | 1996-09-10 | Sumitomo Metal Ind Ltd | Corrosion resisting steel for resistance welded tube |
| JPH0931595A (en) * | 1995-07-25 | 1997-02-04 | Sumitomo Metal Ind Ltd | Corrosion resisting steel for electric resistance welded tube, excellent in toughness at low temperature, and its production |
| JPH09263831A (en) * | 1996-01-22 | 1997-10-07 | Nippon Steel Corp | Production of extra thick high strength bent pipe excellent in toughness at low temperature |
| KR20020027013A (en) * | 2000-10-04 | 2002-04-13 | 이구택 | Steel plate for API-X65 grade line pipe guaranteed stress relief and method of manufacturing them |
| CN1142309C (en) * | 2000-11-01 | 2004-03-17 | 中国科学院金属研究所 | Ultravlow-carbon high-toughness steel resisting hydrogen sulfide for gas deliver pipeline |
| JP2003226922A (en) * | 2001-11-29 | 2003-08-15 | Jfe Steel Kk | Manufacturing method for high strength steel sheet having excellent hic resistance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210054473A1 (en) * | 2018-03-19 | 2021-02-25 | Tata Steel Limited | Steel composition in accordance with api 5l psl-2 specification for x-65 grade having enhanced hydrogen induced cracking (hic) resistance, and method of manufacturing the steel thereof |
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