CN108950388A - A kind of the L485M pipe line steel and its manufacturing method of excellent in low temperature toughness - Google Patents
A kind of the L485M pipe line steel and its manufacturing method of excellent in low temperature toughness Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Abstract
The present invention discloses the L485M pipe line steel and its manufacturing method of a kind of excellent in low temperature toughness.Contain C:0.045%~0.065%, Si:0.10%~0.25%, Mn:1.55%~1.65%, Nb:0.055%~0.075%, Ti:0.010%~0.025%, Mo:0.10%~0.15%, Cr:0.20%~0.30%, Als:0.015%~0.045%, P≤0.015%, S≤0.003%, N≤0.006% in steel, remaining is Fe and inevitable impurity, and Pcm≤0.18%.Thickness of strand≤170mm, 500~850 DEG C of hot chargings, it is heated to 1160~1200 DEG C, roughing finishing temperature >=980 DEG C, 780~820 DEG C of finish rolling finishing temperature, finish rolling total reduction >=65% is then first cooled to 550~600 DEG C with the speed of 40~60 DEG C/s, then is cooled to 400~500 DEG C eventually with 10~25 DEG C/s and batches.Coiled sheet has excellent low-temperature flexibility, the region for extremely tremble with fear area and more severe.
Description
Technical field
The invention belongs to metal material Aldecor fields, and in particular to a kind of pipe-line pipe line steel
Manufacturing method, more particularly to a kind of L485M Grade Pipeline Steel of excellent in low temperature toughness and its manufacturing method of hot-rolled sheet coil.
Background technique
Energy delivery pipe-line construction develops rapidly in recent years, to improve transfer efficiency and operational safety, to selected steel
The obdurability of iron raw material requires higher and higher.Current great pipeline backbone both at home and abroad uses L485M, L555M grade of steel substantially.
When pipeline region is in extremely cold area or pumped (conveying) medium is low-temperature liquefaction natural gas, from operation stability and safety
Property is set out, and to the low-temperature flexibility indexs of raw material, more stringent requirements are proposed, such as low temperature drops hammer and ductile-brittle transition temperature requirement
The index that the temperature of inspection is lower, Charpy-V impact power requires is more high, therefore these engineerings propose higher personalization and want
It asks, it is far from enough only to meet API SPEC 5L specification.
Although the document at present both at home and abroad about L485M Grade Pipeline Steel hot-rolled coil is more, it is able to satisfy -30 DEG C or less
Low temperature fracture toughness requires seldom, introduces several similar documents briefly below:
Chinese patent, application number 201310001803.4 disclose the controlled rolling of the coiled sheet of economical X 70 pipeline steel hot-rolling containing Cr
Control cold technique.C 0.05%~0.075%, Si 0.10%~0.35%, Mn 1.00%~1.65%, Nb in the patent composition
0.050~0.080%, Ti 0.010%~0.025%, Cr 0.30%~0.40% use 8~10 passage roughing in technique,
300~400 DEG C are batched.Without Mo in the patent composition, it is unfavorable for the harden ability control of product, it is difficult to guarantee lower freezing crack
Toughness, in addition roughing passage is more, and single pass rolling reduction is small, not only influences original austenite refinement, has an effect on production efficiency, batch
Temperature is low, increases technique controlling difficulty, easily causes scroll bad.
Chinese patent, application number 200410066297.8 disclose the acicular ferrite type X70 pipe with high arrest toughness
Line steel and its manufacturing method.Patent composition C 0.02%~0.06%, Si 0.10%~0.50%, Mn 1.45%~
1.75%, S≤0.002%, P 0.004%~0.012%, Nb 0.050%~0.080%, V 0.010%~0.060%,
Ti 0.005%~0.025%, Mo 0.10%~0.30%, Cu≤0.30%, Ni≤0.30%, N≤0.008%, Al
0.015%~0.045%.Alloy system is complicated in the patent, and noble element addition is more, at high cost.
Chinese patent, application number 200910237313.8 disclose a kind of X 70 hot-rolled steel coil for pipeline steel.The patent at
Point C 0.04%~0.08%, Si 0.10%~0.30%, Mn 1.40%~1.75%, S≤0.003%, P≤0.018%,
Nb 0.03%~0.06%, V 0.02%~0.05%, Ti 0.010%~0.020%, Mo 0.10%~0.15%, Cr
0.20%~0.30%, Cu 0.15%~0.20%, Ni 0.10%~0.15%, N≤0.006%.Alloy body in the patent
System is complicated, and noble element addition is more, at high cost.
Korean Patent KR20140130324 (A), HOT-ROLLED STEEL SHEET FOR PIPE AND METHOD
OF MANUFACTURING THE SAME.Patent composition C 0.03%~0.12%, Si 0.2%~0.4%, Mn 1.4%
~1.8%, S≤0.01%, P≤0.03%, Nb 0.02%~0.06%, Ti 0.01%~0.04%, Mo≤0.10%, Cr
0.1%~0.5%, Cu 0.15%~0.20%, Ni 0.05%~0.5%, N≤0.01%.Component requirements it is wide in range and containing Ni,
Cu, alloy addition level is more, at high cost, and in addition impurity content requires excessively wide in range, is unfavorable for low temperature fracture toughness control.
Japan Patent JP2015054983 (A), HIGH TOUGHNESS, HIGH DUCTILITY AND HIGH
STRENGTH HOT ROLLED STEEL SHEET AND PRODUCTION METHOD THEREOF.Patent composition C
0.04%~0.15%, Si 0.01%~0.55%, Mn 1.0%~3.0%, S≤0.01%, P≤0.03%, Nb
0.001%~0.035%, V 0.001%~0.1%, Ti 0.001%~0.035%, patent composition requirement is wide in range, contains V,
Without Mo, Cr harden ability element, it is unfavorable for the uniformity controlling of tissue, it is difficult to guarantee low temperature fracture toughness.
United States Patent (USP) US2012247625 (A1), LOW YIELD RATIO, HIGH STRENGTH AND HIGH
UNIFORM ELONGATION STEEL PLATE AND METHOD FOR MANUFACTURING THE SAME.The patent at
Divide C 0.06%~0.12%, Si 0.01%~1.0%, Mn 1.2%~3.0%, S≤0.005%, P≤0.015%, Nb
0.005%~0.07%, Ti 0.005%~0.025%, N≤0.01% etc..Patent composition requirement is wide in range, is free of Mo, Cr
Harden ability element is unfavorable for the uniformity controlling of tissue, it is difficult to guarantee low temperature fracture toughness.
Paper " the ultra thick gauge X70 line steel hot rolling that Niu Tao, An Chenggang et al. are delivered in the tenth China Steel annual meeting
Roll bending Study on Structure Property " in, disclosed chemical component are as follows: C 0.055%, Si 0.20%, Mn 1.60%, P≤
0.001%, S≤0.0012%, Alt0.035%, Nb 0.07%~0.09%, Ti 0.015%, at the same containing Mo, Cr, Ni,
Cu.It is smelted in technique using converter+refining and vacuum degassing process, continuous casting steel billet thickness 250mm, is connected using 2500mm heat
Rolling, the laggard excess of imports rapid cooling of finish to gauge and cooling facility for laminar flow.Nb is higher in steel grade alloy design and contains Ni, Cu, at high cost,
Slab thickness is big, and the overall drafts of rolling is big, and control difficulty is low.
Zheng Lei, Gao Shan have delivered " West-East National Gas Transmission Project heavy caliber X70 in " steel research journal ", 2006,18 (3)
The development of gas transmission line coiled sheet ", only clearly give C, Mn ingredient in text, in other elements including Mo, Ni, Cu etc. valuable member
Element, deducibility high expensive.
L485M Grade Pipeline Steel disclosed in document above can satisfy intensity index requirement, but be difficult to meet substantially-
30 DEG C or less low temperature fracture toughness requirements, some are not added with the uniformity that suitable harden ability element is difficult to control tissue, have
Technique takes conventional section cooling, sufficiently cannot effectively refine crystal grain and control structural homogenity, be added in ingredient also
The expensive alloying elements such as Ni, Cu, higher cost.
Summary of the invention
The object of the present invention is to design the alloy system of simple economy, accurate two-stage control rolling and ultrafast is matched
Cold+laminar flow cooling technology provides a kind of L485M Grade Pipeline Steel hot-rolled coil with excellent low temperature toughness and its manufacturer
Method.
Specific technical solution is:
The present invention proposes a kind of L485M pipe line steel with excellent low temperature toughness, chemical component weight percentage are as follows: C:
0.045%~0.065%, Si:0.10%~0.25%, Mn:1.55%~1.65%, Nb:0.055%~0.075%, Ti:
0.010%~0.025%, Mo:0.10%~0.15%, Cr:0.20%~0.30%, Als:0.015%~0.045%, P≤
0.015%, S≤0.003%, N≤0.006%, surplus are iron and inevitable impurity, and cold crack sensitivity coefficient Pcm≤
0.18%, wherein Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
The ingredient design philosophy of L485M pipe line steel be using C-Mn-Nb-Mo system microalloy design, and add a small amount of Cr,
The elements such as Ti obtain tiny acicular ferrite structure in conjunction with two-stage control rolling and ultrafast cold+laminar flow cooling technology, to protect
Demonstrate,proving pipe line steel has high-intensity and high-tenacity and excellent low temperature fracture toughness, and main basic element and effect are as follows:
C: being intensified element most economical, most basic in steel, by solution strengthening and precipitation strength to the intensity for improving steel
There is obvious effect, but improving C content has negative effect to the ductility, toughness and weldability of steel, low-carbon guarantees that pipe line steel has
Good low-temperature toughness, good welds performance and anti-hydrogen induced cracking (HIC) performance.Therefore, C content control is by the present invention
0.045%~0.065%.
Si: can play certain solution strengthening effect, but too high levels can be such that plasticity and toughness reduces, therefore, this hair
Bright Si content is 0.10%~0.25%.
Mn: improving the intensity of steel by solution strengthening, is to compensate to cause loss of strength because C content reduces in pipe line steel
Main and most economical intensified element.Mn still expands the element of γ phase region, can reduce the γ-α phase transition temperature of steel, help
In obtaining tiny phase-change product, the toughness of steel can be improved, reduce ductile-brittle transition temperature.But manganese belongs to easy segregation element, excessively high
Easily form banded structure.Mn content of the invention is 1.55%~1.65%.
Nb: being one of most important element in modern microalloying pipe line steel, fairly obvious to the effect of crystal grain refinement.It is logical
The recovery and recrystallization that NbC strain induced precipitate during hot rolling hinders deformed austeaite is crossed, is made through controlled rolling and control cooling
The deformed austeaite group of finish rolling stage non-recrystallization zone, which is woven in, is changed into tiny phase-change product when phase transformation, so that steel is with higher
Intensity and high tenacity.Nb also improves the intensity of steel by precipitation strength, and reduction carbon content can be improved Nb when slab reheats and exist
Solid solubility in high temperature austenite can give full play to during subsequent controlled rolling Nb to the work of crystal grain refinement and precipitation strength
With.Nb belongs to noble element, high expensive.Therefore, the control of Nb content is 0.055%~0.075% by the present invention.
Mo: the harden ability of steel can be effectively improved, expand γ phase region, having reduces γ-α phase transition temperature, inhibits polygon iron
The formation of ferritic (PF), promotes the transformation of acicular ferrite (AF), and improves the precipitation strength effect of Nb (C, N), improves steel
Intensity and fracture toughness.But molybdenum belongs to noble element, high expensive.Therefore Mo content of the invention be 0.10%~
0.15%.
Ti: being strong solid N element, and the stoichiometric ratio of Ti/N is 3.42, can fix steel using 0.02% or so Ti
Middle 60ppm N below, can form the TiN precipitated phase of tiny high-temperature stable in sheet billet continuous casting.This tiny TiN particle
Austenite Grain Growth when effectively slab can be hindered to reheat helps to improve solid solubility of the Nb in austenite, simultaneously
There is obvious effect to the impact flexibility for improving welding heat affected zone.Therefore, Ti content of the invention is 0.010%~0.025%.
Cr: can effectively improve harden ability, inhibit the generation of polygonal ferrite and pearlite, promote the mild low temperature in
The transgranular ferrite or bainite for there are a large amount of dislocation distributions is formed in area, is applied in combination with Mo, effect is more significant, compared with Mo,
It is cheap.Therefore, the Cr content of this patent is 0.20%~0.30%.
Als: deoxidant element, the AlN particle of small and dispersed can be formed by adding suitable aluminium, be conducive to refine crystal grain, be improved
The toughness and tenacity of steel, therefore, Als content of the invention are 0.015%~0.045%.
P, S, N: being inevitable impurity element in steel, it is desirable to it is more lower better, but require it is too low will increase production cost,
P≤0.015% of the invention, S≤0.003%, N≤0.006%.
Pcm: control cold crack sensitivity coefficient is conducive to ensure the welding performance of product, Pcm control of the invention≤
0.18%.
The present invention also proposes that a kind of manufacture using continuous casting and rolling technique of sheet bar has good low-temperature toughness L485M pipe line steel
The method of hot-rolled coil.Its technological process of production is related to: molten iron pretreatment-converter smelting-external refining is (at RH+LF+ calcium
Reason)-ultrafast cold+the section cooling-of continuous casting-heating of plate blank-rolling-batches.It is characterized in that:
(1) continuous casting process: molten iron pretreatment is smelted, converter smelting --- through top blast or top bottom blowing, the outer essence of furnace
Refining --- through RH application of vacuum, the frivolous sulphuring treatment of LF furnace and Calcium treatment is carried out to control inclusion morphology and improves the extension of steel
Property, toughness and cold-bending property, sheet billet continuous casting continuous casting steel billet is made --- whole process protection casting, and put into dynamic soft-reduction, to subtract
Few continuous casting billet center segregation, slab thickness≤170mm, hence it is evident that be thinner than and lead the thick continuous casting billet of 200mm or more to be applied at present, coagulate
Gu cooling rate is far longer than traditional heavy slab, secondary dendrite spacing significantly reduces.
(2) rolling mill practice: continuous casting steel billet is heated in 500~850 DEG C of direct hot chargings, continuous casting steel billet through walking beam furnace
It 1160~1200 DEG C, is rolled after through roughing and mm finishing mill unit two-stage control, roughing finishing temperature >=980 DEG C, roughing 3~5
Passage, finish rolling start rolling temperature are≤960 DEG C, and finish rolling finishing temperature is 780~820 DEG C, and finish rolling total reduction guarantees >=65%, with
It is cooling using two-stage control afterwards, first use ultrafast cold mode to be cooled to 550~600 DEG C with the speed of 40~60 DEG C/s, then
It uses section cooling mode to be cooled to 400~500 DEG C eventually with the speed of 10~25 DEG C/s to batch.
L485M grade of steel hot-rolled sheet coil of the invention has excellent comprehensive performance: yield strength is 500~600MPa, is resisted
600~700MPa of tensile strength, elongation after fracture >=30%, yield tensile ratio≤0.90；- 40 DEG C of Charpy-V impact power (3 samples) Akv >=
300J, -40 DEG C of average drop hammer test section of shear (2 samples) SA >=95%；Hardness HV10≤230, clod wash are qualified.
Technical solution of the present invention is particular in that: (1) alloy design is simple, is set using C-Mn-Nb-Mo system alloy
Meter, and the microalloy elements such as a small amount of Cr, Ti are added, without Ni, Cu, V etc., cost of alloy is low.(2) continuous casting steel billet thickness≤
170mm, it is high-efficient using short route continuous casting and rolling process for production, save the energy.(3) ultrafast cold+section cooling mode two is used
Section control cooling, guarantees that crystal grain is tiny, even tissue.(4) product excellent combination property, especially low-temperature flexibility, at -40 DEG C
Under, drop hammer test average shear area >=95%.
The utility model has the advantages that
The present invention compared with the existing technology, has the beneficial effect that:
(1) alloy design is simple, is designed using C-Mn-Nb-Mo system alloy, and adds the microalloys such as a small amount of Cr, Ti member
Element, without Ni, Cu, V etc., cost of alloy is low.
(2) continuous casting steel billet thickness≤170mm, it is high-efficient using short route continuous casting and rolling process for production, save the energy.
(3) using ultrafast cold+two sections of section cooling mode control cooling, crystal grain is tiny for guarantee, even tissue.
(4) product excellent combination property, especially low-temperature flexibility, at -40 DEG C, drop hammer test average shear area
>=95%.
(5) using the L485M pipe line steel of above method production, the cold zone or sand close to polar region be can be widely applied to
The harsh region of the natural environments such as desert, deep-sea.
Detailed description of the invention
Fig. 1 is the optical microstructure of embodiment 1；Microscopic structure is ferrite；
Specific embodiment
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention,
The content of present invention is not limited.
Table 1 is the chemical component of embodiment steel.Its process flow is molten iron pretreatment-converter smelting-external refining (RH
+ LF+ Calcium treatment)-ultrafast cold+the section cooling-of continuous casting-heating of plate blank-rolling-batches, embodiment steel concrete technology system
It is shown in Table 2.Table 3 is the main mechanical properties of embodiment steel.
1 embodiment steel chemical composition (wt, %) of table
| Embodiment | C | Si | Mn | P | S | Nb | Ti | Mo | Cr | Als | N | Pcm |
| 1 | 0.052 | 0.13 | 1.61 | 0.012 | 0.002 | 0.055 | 0.017 | 0.10 | 0.30 | 0.028 | 0.005 | 0.16 |
| 2 | 0.045 | 0.25 | 1.65 | 0.013 | 0.003 | 0.066 | 0.019 | 0.13 | 0.28 | 0.033 | 0.006 | 0.16 |
| 3 | 0.057 | 0.17 | 1.58 | 0.014 | 0.001 | 0.060 | 0.010 | 0.14 | 0.24 | 0.045 | 0.004 | 0.16 |
| 4 | 0.065 | 0.10 | 1.62 | 0.015 | 0.002 | 0.072 | 0.025 | 0.12 | 0.26 | 0.022 | 0.004 | 0.17 |
| 5 | 0.060 | 0.14 | 1.55 | 0.011 | 0.002 | 0.068 | 0.022 | 0.11 | 0.20 | 0.015 | 0.005 | 0.16 |
| 6 | 0.048 | 0.22 | 1.49 | 0.013 | 0.003 | 0.075 | 0.014 | 0.15 | 0.22 | 0.020 | 0.004 | 0.15 |
Note: Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
2 embodiment steel process system of table
3 embodiment steel main mechanical properties of table
By table 1~3 as it can be seen that the L485M line steel hot rolling coiled sheet produced using technical solution of the present invention, is had good comprehensive
Mechanical property is closed, especially there is excellent low-temperature flexibility, can be widely applied to extremely to tremble with fear area and the harsh region of natural conditions.
Claims (2)
1. a kind of L485M pipe line steel of excellent in low temperature toughness, which is characterized in that chemical component is by mass percentage in steel are as follows: C:
0.045%~0.065%, Si:0.10%~0.25%, Mn:1.55%~1.65%, Nb:0.055%~0.075%, Ti:
0.010%~0.025%, Mo:0.10%~0.15%, Cr:0.20%~0.30%, Als:0.015%~0.045%, P≤
0.015%, S≤0.003%, N≤0.006%, remaining is Fe and inevitable impurity, and cold crack sensitivity coefficient Pcm≤
0.18%, wherein Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
2. a kind of manufacturing method of the L485M pipe line steel of excellent in low temperature toughness as described in claim 1, the production technology of steel plate
Are as follows: the molten iron pretreatment-converter smelting-ultrafast cold+section cooling-volume of external refining-continuous casting-heating of plate blank-rolling-
It takes, which is characterized in that
(1) it smelts continuous casting process: top blast or top bottom blowing is used, through RH application of vacuum, the frivolous sulphuring treatment of LF furnace and progress
Calcium treatment, whole process protection casting, Mobile state slighter compress of going forward side by side, thickness of strand≤170mm；
(2) rolling mill practice: continuous casting steel billet is heated to 1160~1200 DEG C in 500~850 DEG C of direct hot chargings, after through roughing and
The rolling of mm finishing mill unit two-stage control, roughing finishing temperature >=980 DEG C, 3~5 passage of roughing, finish rolling start rolling temperature are≤960
DEG C, finish rolling finishing temperature is 780~820 DEG C, and finish rolling total reduction >=65% is then cooling using two-stage control, is first used
Ultrafast cold mode is cooled to 550~600 DEG C with the speed of 40~60 DEG C/s, then uses section cooling mode with 10~25 DEG C/s
Speed be cooled to 400~500 DEG C eventually and batch.
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| CN111893401A (en) * | 2020-08-03 | 2020-11-06 | 鞍钢股份有限公司 | L450MS pipeline steel with excellent SSCC resistance under high loading stress and manufacturing method thereof |
| CN111996448A (en) * | 2020-08-03 | 2020-11-27 | 鞍钢股份有限公司 | L485MS pipeline steel with excellent SSCC (stress induced cracking) resistance under high loading stress and manufacturing method thereof |
| CN115029620A (en) * | 2022-04-28 | 2022-09-09 | 鞍钢股份有限公司 | Low-cost high-toughness hot-rolled coil plate for drill pipe of rotary drilling rig and manufacturing method thereof |
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| CN111893401A (en) * | 2020-08-03 | 2020-11-06 | 鞍钢股份有限公司 | L450MS pipeline steel with excellent SSCC resistance under high loading stress and manufacturing method thereof |
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| CN115449709A (en) * | 2022-08-30 | 2022-12-09 | 鞍钢股份有限公司 | Thick-specification high-strength high-toughness L485M pipeline steel and production method thereof |
| CN115449709B (en) * | 2022-08-30 | 2024-02-13 | 鞍钢股份有限公司 | Thick-specification high-strength-toughness L485M pipeline steel and production method thereof |
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