CN1715435A - Method for producing X80 pipeline steel having anti-HIC property and its hot-rolled plate - Google Patents
Method for producing X80 pipeline steel having anti-HIC property and its hot-rolled plate Download PDFInfo
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Abstract
The present invention relates to production process of pipeline steel and its hot rolled plate, and is especially production process of one kind of HIC resistant X80 pipeline steel and its hot rolled plate coil. The HIC resistant X80 pipeline steel consists of: C 0.025-0.055 wt%, Si 0.19-0.30 wt%, Mn 1.70-1.90 wt%, Ti 0.01-0.02 wt%, Al 0.015-0.040 wt%, V 0.045-0.065 wt%, Ni 0.25-0.35 wt%, Cr not more than 0.02 wt%, B not more than 0.0002 wt%, P not more than 0.015 wt%, S not more than 0.002 wt%, Ca 0.0020-0.0045 wt%, Mo 0.20-0.40 wt%, Cu 0.20-0.40 wt%, Nb 0.02-0.10 wt%, N not more than 0.06 wt%, O not more than 0.004 wt%, and H not more than 0.00025 wt% except Fe and small amount of impurity. The HIC resistant X80 pipeline steel is mainly used in acid medium conveying pipeline and has excellent HIC resisting performance to ensure conveying safety.
Description
Technical field: the present invention relates to the manufacture method of a kind of pipe line steel and hot-rolled sheet thereof, particularly a kind of have anti-HIC performance X80 pipe line steel and a hot rolled plate making process thereof.
Background technology: oil, the Sweet natural gas of overwhelming majority of countries are all followed API API 5L standard with steel pipe in the world at present, or propose to replenish requirement based on this and according to concrete pipe engineering needs.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.By its concrete application target difference, pipe line steel can be divided into three levels haply again, that is: first level only claims to the intensity of steel; Second level not only has requirement to intensity, but also the flexible requirement; The 3rd level also has anti-HIC (Hydrogen Induced Crack hydrogen lures crackle) performance requriements except that intensity and toughness reguirements.Wherein back one level steel grade performance has all comprised the performance of last level steel grade, is replenishing and expansion of last level.Being to require the strictest, the highest steel grade of state of the art requirement in the pipe line steel, is an important component part of steel for pipe series.Therefore, can say that it is a highest level of representing Steel Complex's hot-rolled product to produce, be the typical products of contemporary metallurgical technology and equipment perfect adaptation.
At present, X52, X60, X65, X70 grade of steel are arranged, but the patent that has anti-HIC performance and satisfy the X80 line steel hot rolling coiled sheet aspect of API 5L standard-required does not have also in the patent of the line steel hot rolling coiled sheet with anti-HIC performance aspect manufacturing and designing.
Japanese Patent JP 2002129288 discloses " high strength pipe bend and itsmanufacturing method ", wherein API X80-100 ladle contains: C≤0.03%, Si≤0.3%, Mn0.8-2.5%, P≤0.015%, S≤0.005%, Nb 0.01-0.05%, Ti 0.005-0.030%, Al≤0.05%, N 0.001-0.06%, and other any metal Ni 0.01-1.0%, Cu 0.1-1.2%, Cr 0.1-1.0%, V 0.01-0.10%, Ca 0.001-0.005%, Mg 0.0001-0.002%, other is an iron, Q=2.2-3.7, Q=2.7C+0.4Si+Mn+0.8Cr+0.5 (Ni+Cu)+Mo+V.The raw material steel pipe is 800-1000 ℃ of hot rolling, and bending is quenched then, obtains final bend pipe product.Chinese patent application 01126611.2 discloses " a kind of low-carbon low-alloy steel and pipe ", and this invention relates to a kind of low-carbon low-alloy steel and pipe, belongs to the metal iron and steel domain.Technical problem to be solved is to increase the obdurability of steel alloy and improve hardening capacity and welding property.Low-carbon low-alloy steel comprises following element: carbon: 0.10～0.16%; Silicon: 0.20～0.40%; Manganese: 1.00～1.35%; Aluminium: 0.02～0.035%; Vanadium: 0.07～0.13%; Nickel: 0.05～0.25%; Boron: 0.0005～0.0035%; Phosphorus :≤0.010%; Sulphur :≤0.005%; Molybdenum :≤0.01%; Copper :≤0.20%; Niobium :≤0.01%; Iron and trace impurity: surplus.The low-carbon low-alloy steel of this invention can be made into the tubing of X60～X80 grade of steel line pipe or similar intensity grade of steel.It is not very good that all there is impelling strength in this this two patents, and because the higher cost that causes of noble metal content is higher, and not possessing good anti-HIC performance, this class pipe line steel can't satisfy the high request of carrying acidic medium.
Summary of the invention: the technical issues that need to address of the present invention are: satisfying the impelling strength that API-5L improves the X80 pipe line steel on to the basis of X80 pipe line steel performance demands, reduce its production cost, improve anti-HIC performance.
Having the pipe line steel of anti-HIC performance all compares strict for the microtexture requirement of purity, component segregation and the steel of steel.Improving the purity of steel can realize by the content that reduces impurity such as P, S.And the component segregation that reduces steel just must reduce the content of easy segregation element such as C, Mn and cooperate suitable continuous casting process, though reduce C, the Mn element helps improving impelling strength and anti-HIC performance, but greatly reduce the intensity of steel.The segregation of minimizing microstructure is by the reasonable component configuration and cooperate suitable cooling controlling and rolling controlling process system to realize.This patent is had the X80 pipe line steel of anti-HIC performance again for high intensity promptly arranges, and adopts lower C, P, S content in the composition design, is beneficial to anti-HIC performance; To reduce in order remedying simultaneously, suitably to be added with the alloying elements such as Cu, Ni that are beneficial to anti-HIC performance owing to C reduces the intensity that causes.In order to obtain having the microtexture of less segregation, improve Nb content and cooperate low carbon content, obtain the NbC particle, the refinement microtexture improves the recrystallize final temperature, reduces microstructure segregation, not only proof strength and toughness but also guarantee anti-HIC performance.Done more simultaneous test in design when of the present invention, obtain at last can the various performances of balance composition and technology.
The present invention designs Ultra-low carbon and has acicular ferrite X80 pipe line steel, not only has high intensity and toughness, also has good anti-HIC performance.Before the present invention produced, general pipe line steel was mainly the steel grade of " ferrite+perlite " types of organization, is the high-strength line-pipe steel hot-rolled sheet coil of " poor perlite " types of organization.This class steel grade often has tangible banded perlite at the thickness of slab centre portions.And adopt with " low-carbon (LC) or Ultra-low carbon acicular ferrite " be tissue signature pipe line steel composition, technological design, can obviously eliminate the banded pearlitic structure in the steel, the anti-HIC performance of assurance pipe line steel coiled sheet.
X80 pipe line steel composition design philosophy with anti-HIC performance is with low C, high Mn, by adding microalloy elements such as micro-Nb, V, Ti, a small amount of Mo and Cu, Ni alloying element, in conjunction with the hot rolling cooling controlling and rolling controlling process, obtain acicular ferrite structure, have the performance of high-intensity high-tenacity to guarantee pipe line steel.Its main fundamental element is chosen and acts on as follows:
Carbon: be strengthening element most economical, the most basic in the steel, by solution strengthening and precipitation strength the intensity that improves steel there is obvious effect, but raising C content has negative impact to ductility, toughness and the weldability of steel, therefore modern age pipe line steel evolution be the process that constantly reduces C content, as shown in Figure 1.Reduce the toughness that C content helps to improve steel on the one hand, can improve the welding property of steel on the other hand.From Fig. 1 as seen, pipe line steel can have good weldability when C content is lower than 0.11%.So the C content of current pipeline steel is generally less than 0.11%, to need more the pipe line steel of high tenacity then adopt C less than 0.06% ultralow C content design, the present invention chooses 0.025-0.055%.
Manganese:, be that compensation reduces the main and most economical strengthening element that causes loss of strength in the pipe line steel because of C content by the intensity of solution strengthening raising steel.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.Therefore the Mn content to the X80 pipe line steel designs in 1.70～1.95% scopes.
Niobium: be one of topmost element in the modern microalloying pipe line steel, fairly obvious to the effect of grain refining.Separate out the austenitic answer of obstruction deformation, recrystallize by NbC strain inducing in the course of hot rolling, when making the rolling deformation austenite structure in non-recrystallization zone of finish rolling stage in phase transformation, controlled rolling and controlled chilling change tiny phase-change product into, so that steel has high strength and high tenacity, the present invention chooses 0.02-0.10%.
Vanadium: have higher precipitation strength effect and more weak grain refining effect, when Nb, V, three kinds of compound uses of microalloy element of Ti, V mainly is by improving the intensity of steel with the VC precipitation strength in ferrite, and the present invention chooses 0.045-0.065%.
Titanium: be strong solid N element, the stoichiometric ratio of Ti/N is 3.42, utilizes the Ti fixing following N of 60ppm in the steel just about 0.02%, 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 helps to improve the solid solubility of Nb in austenite, simultaneously the impelling strength of improving welded heat affecting zone is had obvious effect, and the present invention chooses 0.01-0.02%.
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, under certain cooling conditions and coiling temperature, add 0.2～0.4% Mo in the low-carbon (LC) pipe line steel and just can obtain tangible acicular ferrite structure, change to the low temperature direction because of phase transformation simultaneously, can make and organize further refinement, mainly be the intensity that improves steel by the phase transformation strengthening of tissue.
Sulphur, phosphorus: be unavoidable impurities element in the steel, it is low more good more to wish.Handle by super low sulfur (less than 30ppm) and Ca sulfide is carried out inclusion morphology control, can make pipe line steel have high impelling strength and good anti-HIC performance, sulphur of the present invention chooses≤0.002%, and phosphorus chooses≤and 0.015%.
Copper, nickel: can improve the intensity of steel by the solution strengthening effect, 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 thickness causes in thick specification pipe line steel, copper of the present invention is chosen 0.2-0.4%, and nickel is chosen 0.25-0.35%.
Therefore, have high-intensity high-tenacity and good welds performance and anti-HIC performance at micro-alloying low-carbon acicular ferrite structure, and low characteristics such as Bauschinger effect, with grain refining, phase transformation strengthening, material reinforcement such as precipitation strength and dislocations strengthening theory is the basis, use for reference the long-term pipe line steel knowhow of Baosteel and have the pipe line steel laboratory study result of low-carbon (LC) acicular ferrite structure feature, ultralow carbon content has been adopted in the composition design of acicular ferrite X80 pipe line steel with anti-HIC performance, super low sulfur, Nb, V, Ti, Cu, the Ni microalloying, the composition design of the Mo alloying of control tissue.
Process for making adopts the smelting Technology for Clean Steel of Ultra-low carbon (carbon is less than 0.06%), super low sulfur (sulphur is less than 30ppm), inclusion morphology control, hot rolling technology has adopted the hot mechanical treatment technology of controlled rolling and controlled cooling, carry out the organizational controls of the finished product by reasonable component and technology, to obtain to have the low-carbon (LC) acicular ferrite structure of high-intensity high-tenacity.X80 pipe line steel with anti-HIC performance can be used for making the pipe line steel steel pipe of carrying acidic medium, and its good anti-HIC performance has guaranteed the security of transportation.
Technical scheme of the present invention is: have anti-HIC performance X80 pipe line steel, the weight percent of its moiety is:
| Element | C | Mn | Si | S | P | Nb | Ti | V | Alt |
| Scope (wt%) | 0.025～ 0.055 | 1.70～ 1.95 | 0.190～ 0.300 | ≤ 0.0020 | ≤ 0.015 | 0.020～ 0.100 | 0.010～ 0.020 | 0.045～ 0.065 | 0.015～ 0.040 |
| Element | Mo | Cu | Ni | Cr | B | Ca | N | O | H |
| Scope (wt%) | 0.20～ 0.40 | 0.20～ 0.40 | 0.25～ 0.35 | ≤ 0.02 | ≤ 0.0002 | 0.0020～ 0.0045 | ≤ 0.0060 | ≤ 0.0040 | ≤ 0.00025 |
Manufacture method with anti-HIC performance X80 pipe line steel is:
By the technical scheme alloy formula, it is the steel-smelting technology of principal character that employing is fed the calcium silk with LF+RH+, use the thick continuously cast bloom of 250mm, by the recrystallization zone on roughing milling train and the 7 frame tandem rolling units and the controlled rolling and the controlled cooling technology in non-recrystallization district, the high-intensity high-tenacity X80 line steel hot rolling coiled sheet that production specification≤15mm is thick with anti-HIC performance.
● operational path
Molten iron pre-desulfurization → LD converter smelting → external refining (RH+LF+ feeds the calcium silk) → continuous casting → slab reheat → controlled rolling → controlled chilling → batch
● the hot rolling technology design
(1) slab heating temperature: 1170～1250 ℃;
(2) roughing final temperature: 960～1040 ℃;
(3) finish rolling compression ratio: 〉=75%
(4) finish rolling final temperature: 800～860 ℃;
(5) coiling temperature: 430～580 ℃;
The invention has the beneficial effects as follows: because the composition design of the Mo alloying of ultralow carbon content, super low sulfur, Nb, V, Ti, Cu, Ni microalloying, control tissue has been adopted in the composition design.Obtain to have the low-carbon (LC) acicular ferrite structure of high-intensity high-tenacity, can improve the anti-HIC performance of pipe line steel greatly, satisfied the requirement of carrying acidic medium.
Compare with the existing steel grade (highest level X70 and anti-HIC X65 steel grade) of producing, the performance of the line steel hot rolling coiled sheet of producing according to technique scheme reaches following requirement:
(1) tensile property:
Target: σ
0.5=580～690MPa, σ
b=621～830MPa, σ
0.5/ σ
b≤ 0.93, δ
50〉=18%.
(2) v-notch impact property:
Target: test temperature-20 ℃, the ballistic work mean value 〉=120J of 10 * 10 * 55mm sample
Shear area is single 〉=and 80%, average 〉=90%.
(3) DWTT performance:
Target: test temperature-15 ℃, average shear area SA% 〉=85%, single SA% 〉=70%.
(4) horizontal cold-bending property:
Target: d=2a is 180 °, intact.
(5) hardness test: (transverse section hardness)
Target: Hv10≤270.
(6) metallographic structure:
Target: grain fineness number (ASTM E112): 8 grades or thinner.Be organized as acicular ferrite+polygonal ferrite+MA tissue.
(7) HIC performance
Target: NACE TMO284-96 standard B solution, satisfy CLR≤15%, CTR≤5%, CSR≤2%.
Description of drawings:
Fig. 1 is the Graville graphic representation of C content in the steel, carbon equivalent and steel weldability relation
Fig. 2 organizes metallograph for embodiment 1 reel number 4056700100 roll bendings
Embodiment: the manufacturing and designing of the X80 line steel hot rolling coiled sheet of embodiment 1,14.6 * 1550 * Cmm
● Chemical Composition (wt%)
| Element | C | Mn | Si | S | P | Nb | Ti | V | Alt |
| Scope | 0.038 | 1.88 | 0.20 | 0.0012 | 0.015 | 0.065 | 0.014 | 0.045 | 0.03 |
| Element | Mo | Cu | Ni | Cr | B | Ca | N | O | H |
| Scope | 0.32 | 0.24 | 0.27 | ≤0.02 | ≤0.0002 | 0.0024 | 0.0040 | 0.0030 | ＜0.00025 |
● operational path
Molten iron pre-desulfurization → LD converter smelting → external refining (RH, LF, hello Ca silk) → continuous casting → slab finishing → slab reheat → controlled rolling → controlled chilling → batch
● hot rolling technology
(1) slab heating temperature: 1200 ± 15 ℃;
(2) roughing final temperature: 980 ± 20 ℃
(3) finish rolling compression ratio: 〉=75%
(4) finish rolling final temperature: 820 ± 15 ℃;
(5) coiling temperature: 540 ± 15 ℃;
● results of property
Trial-production coiled sheet traditional performance assay
| Reel number | σ 0.5MPa | σ b MPa | σ 0.5/σ b | δ 50％ | H V10 | E CVN-20℃J | SA％ bcDWTT |
| 4056700100 | 590 | 713 | 0.84 | 37 | 230 | 313 | 90 |
Annotate: stretching, impact are 30 ° of directions samplings; The CVN impact specimen is of a size of 10 * 10 * 55mm; Laterally clod wash is intact, and it organizes metallograph to see Fig. 2.
● the HIC performance
Sample: heat (batch) number 121626, reel number 4056700100
Sample position and quantity: 3 at wide 1/4 place of plate, 3 at wide 1/2 place of plate
Specimen size and orientation: size 20 * 100 * thickness mm, sample 100mm length direction is parallel roll to
Touchstone: NACE TM0284-96 standard; Solution: NACE TM0284-96 standard B solution
Test-results:
● wide 1/2 place of plate
| Numbering | Sightingpiston | CLR％ | CTR％ | CSR％ |
| Sightingpiston 1 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 |
| The 1st | Sightingpiston 3 | 0.00 | 0.00 | 0.00 |
| On average | 0.00 | 0.00 | 0.00 | |
| The 2nd | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.00 | 0.00 | 0.00 | |
| The 3rd | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.00 | 0.00 | 0.00 | |
| The average result of wide 1/2 HIC of place of plate | 0.00 | 0.00 | 0.00 | |
● wide 1/4 place of plate
| Numbering | Sightingpiston | CLR％ | CTR％ | CSR％ |
| The 1st | Sightingpiston 1 | 0.30 | 0.20 | 0.06 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.10 | 0.07 | 0.02 | |
| The 2nd | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.00 | 0.00 | 0.00 | |
| The 3rd | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.00 | 0.00 | 0.00 | |
| The average result of wide 1/4 HIC of place of plate | 0.09 | 0.02 | 0.01 | |
Manufacturing and designing of the X80 line steel hot rolling coiled sheet of embodiment 2,12.7 * 1550 * Cmm
● Chemical Composition (wt%)
| Element | C | Mn | Si | S | P | Nb | Ti | V | Alt |
| Scope | 0.048 | 1.78 | 0.25 | 0.0016 | 0.010 | 0.085 | 0.017 | 0.05 | 0.02 |
| Element | Mo | Cu | Ni | Cr | B | Ca | N | O | H |
| Scope | 0.25 | 0.30 | 0.30 | ≤0.02 | ≤0.0002 | 0.0034 | 0.0040 | 0.0030 | ＜0.00025 |
● operational path
Thin → LD converter smelting → external refining that molten iron takes off in advance (PH, LF, hello Ca silk) → continuous casting → slab finishing → slab reheat → controlled rolling → controlled chilling → batch
● hot rolling technology
(1) slab heating temperature: 1200 ± 15 ℃;
(2) roughing final temperature: 990 ± 20 ℃
(3) finish rolling compression ratio: 〉=75%
(4) finish rolling final temperature: 820 ± 15 ℃;
(5) coiling temperature: 510 ± 15 ℃;
● results of property
Trial-production coiled sheet traditional performance assay
| σ 0.5MPa | σ b MPa | σ 0.5/σ b | δ 50％ | H V10 | E CVN-20℃J | SA％ bc DWTT |
| 597 | 720 | 0.83 | 38 | 237 | 337 | 100 |
Annotate: stretching, impact are 30 ° of directions samplings; The CVN impact specimen is of a size of 10 * 10 * 55mm; Laterally clod wash is intact.
● the HIC performance
Sample position and quantity: 3 at wide 1/4 place of plate, 3 at wide 1/2 place of plate
Specimen size and orientation: size 20 * 100 * thickness mm, sample 100mm length direction is parallel to be rolled to touchstone: NACE TMO284-96 standard; Solution: NACE TMO284-96 standard B solution
Test-results:
● wide 1/2 place of plate
| Numbering | Sightingpiston | CLR％ | CTR％ | CSR％ |
| The 1st | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.00 | 0.00 | 0.00 | |
| The 2nd | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 |
| On average | 0.00 | 0.00 | 0.00 | |
| The 3rd | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.00 | 0.00 | 0.00 | |
| The average result of wide 1/2 HIC of place of plate | 0.00 | 0.00 | 0.00 | |
● wide 1/4 place of plate
| Numbering | Sightingpiston | CLR％ | CTR％ | CSR％ |
| The 1st | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.00 | 0.00 | 0.00 | |
| The 2nd | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.00 | 0.00 | 0.00 | |
| The 3rd | Sightingpiston 1 | 0.00 | 0.00 | 0.00 |
| Sightingpiston 2 | 0.00 | 0.00 | 0.00 | |
| Sightingpiston 3 | 0.00 | 0.00 | 0.00 | |
| On average | 0.00 | 0.00 | 0.00 | |
| The average result of wide 1/4 HIC of place of plate | 0.00 | 0.00 | 0.00 | |
Estimate feasibility and prospect that invention is applied: the sulphur content of China's natural gas is generally all lower, under the low situation of distribution pressure, can by after the desulfurization as sweet gas (PH
2S≤300Pa) use.When distribution pressure improves, make the dividing potential drop of hydrogen sulfide be not more than 300Pa, then must reduce the input concentration of hydrogen sulfide, handle to desulfurization like this and brought great difficulty.Therefore, the pipe line steel of development hydrogen sulfide corrosion resistant is imperative, and is particularly more necessary concerning the very high gas field of sulphur content.Therefore also more and more stricter to the requirement of pipeline steel, when requiring to have high strength and toughness, antagonism HIC aspect of performance has also been done strict requirement.Improving constantly of grade of steel, just difficult more for improving 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.Therefore, the high-intensity high-tenacity X80 line steel hot rolling coiled sheet with anti-HIC performance has bigger application prospect.
Claims (2)
1, a kind of have an anti-HIC performance X80 pipe line steel, and the weight percent of its moiety is: carbon 0.025～0.055%; Silicon: 0.19～0.30%; Manganese: 1.70～1.95%; Titanium: 0.01～0.02%; Aluminium: 0.015～0.040%; Vanadium: 0.045～0.065%; Nickel: 0.25～0.35%; Chromium≤0.02%; Boron :≤0.0002%; Phosphorus :≤0.015%; Sulphur :≤0.002%; Calcium: 0.0020～0.0045%; Molybdenum: 0.20～0.40%; Copper: 0.20～0.40%; Niobium: 0.02～0.10%; Nitrogen :≤0.006%; Oxygen :≤0.004%; Hydrogen :≤0.00025; Iron and trace impurity: surplus.
2, claim 1 is described has an anti-HIC performance X80 line steel hot rolling coiled sheet manufacture method, processing step comprises: by power 1 proportioning get the raw materials ready, molten iron pre-desulfurization, LD converter smelting, external refining promptly cooperate LF to cooperate by RH to feed calcium silk, continuous casting, slab reheat, controlled rolling, controlled chilling again, batch, it is characterized in that: slab heating temperature is controlled at: 1170～1250 ℃; The roughing final temperature is controlled at: 960～1040 ℃; Finish rolling compression ratio: 〉=75%; The finish rolling final temperature is controlled at: 800～860 ℃; Coiling temperature is controlled at: 430～580 ℃.
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|---|---|---|---|
| CNB2004100255859A CN100352962C (en) | 2004-06-30 | 2004-06-30 | Method for producing X80 pipeline steel having anti-HIC property and its hot-rolled plate |
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|---|---|---|---|
| CNB2004100255859A CN100352962C (en) | 2004-06-30 | 2004-06-30 | Method for producing X80 pipeline steel having anti-HIC property and its hot-rolled plate |
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|---|---|
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| CN100352962C CN100352962C (en) | 2007-12-05 |
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| CN100420769C (en) * | 2006-08-24 | 2008-09-24 | 武汉钢铁(集团)公司 | Rolling controlled and cooling controlled steel for hydraulic power station penstock and manufacture method thereof |
| CN101041880B (en) * | 2006-03-23 | 2010-05-12 | 株式会社神户制钢所 | Steel plate having welding joint with excellent tenacity and manufacturing method thereof |
| CN101542001B (en) * | 2007-03-30 | 2011-08-31 | 住友金属工业株式会社 | Low alloy steel for the pipe for oil well use and seamless steel pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2187028C (en) * | 1995-02-03 | 2001-07-31 | Hiroshi Tamehiro | High strength line pipe steel having low yield ratio and excellent low temperature toughness |
| JP3941211B2 (en) * | 1998-03-30 | 2007-07-04 | Ｊｆｅスチール株式会社 | Manufacturing method of steel plate for high-strength line pipe with excellent HIC resistance |
| RU2180016C1 (en) * | 2001-05-14 | 2002-02-27 | Открытое акционерное общество "Северсталь" | Steel for oil-trunk and gas-main pipelines |
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2004
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