CN101643885A - Engineering steel with excellent lamellar tearing resisting performance and production method thereof - Google Patents
Engineering steel with excellent lamellar tearing resisting performance and production method thereof Download PDFInfo
- Publication number
- CN101643885A CN101643885A CN200910063722A CN200910063722A CN101643885A CN 101643885 A CN101643885 A CN 101643885A CN 200910063722 A CN200910063722 A CN 200910063722A CN 200910063722 A CN200910063722 A CN 200910063722A CN 101643885 A CN101643885 A CN 101643885A
- Authority
- CN
- China
- Prior art keywords
- steel
- percent
- temperature
- lamellar tearing
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses engineering steel capable of resisting lamellar tearing and a production method thereof. The engineering steel comprises the following components in percentage by weight: 0.05-0.35 percent of C, 0.01-0.85 percent of Si, 0.30-1.50 percent of Mn, not more than 0.015 percent of P, not more than 0.008 percent of S, 0.15-0.85 percent of Cr, 0.10-0.55 percent of Ni, 0.005-0.055 percent of Zr and the balance of Fe and inevitable impurities, and the chemical compositions satisfy the following relational expression: 2Mn+Ni is more than or equal to C+Cr and is less than or equalto 3.50 percent, and Cr+Zr is more than or equal to C+S and is less than or equal to 0.85 percent. The production method comprises the following steps: carrying out argon blowing and vacuum system refining in conventional smelting, soaking at the temperature of 1150-1300 DEG C, and preserving heat for at least 3 hours; reversible rolling: starting rolling at the temperature of 1100 DEG C, finishing rolling at the temperature of 850-950 DEG C, carrying out normalizing heat treatment at the temperature of 860-960 DEG C, and naturally cooling to the normal temperature. The tensile strength of theengineering steel reaches not less than 520MPa, the shrinkage ratio Zz of a tension section in a thickness direction reaches not less than 55 percent, and the lamellar tearing resisting performance is excellent.
Description
Technical field
The present invention relates to the alloy high-strength steel and make the field, specifically belong to the steel grade and the production method thereof of Steel Structure Works such as being used for marine drilling platform, oceangoing vessel, large bridge, Highrise buildings and the anti-lamellar tearing of energy.
Background technology
Steel Structure Works such as marine drilling platform, oceangoing vessel, large bridge, Highrise buildings are more and more higher to the performance requriements of steel, not only require steel to have good basic mechanical performance, also require to have good stratiform tear resistance, and promptly Z is to performance.Usually, the relative reduction in area Zz of employing steel plate thickness direction standard tensile sample weighs the quality of the anti-lamellar tearing performance of steel plate, for the steel plate of thickness, require Zz 〉=15% (being designated as Z15), Zz 〉=25% (being designated as Z25), Zz 〉=35% (being designated as Z35) usually greater than 15mm.If Steel Structure Work is built with the tear resistance steel, can guarantee construction quality, improve engineering work-ing life, economic benefit and social benefit are huge.Therefore, the object of the present invention is to provide a kind of have good resistance tear resistance steel and manufacturing technology thereof, satisfy the demand of jumbo ship, offshore drilling platform, large bridge, Highrise buildings usefulness steel.
Before the present patent application, Chinese patent application number is 200810119506.9 to disclose a kind of " steel for controlled rolling and controlled cooling platform and production method thereof ", and its chemical composition and weight percent content are: C 0.05～0.09%, and Mn 1.20～1.60%, Si 0.20～0.50%, Nb 0.03～0.05%, and Ti 0.010～0.020%, and V 0.03～0.06%, S≤0.005%, Als 0.020～0.040%, P≤0.015%, and surplus is Fe and impurity.Adopt hot mechanical CONTROL PROCESS process (TMCP) to produce, will smelt good molten steel casting by composition and become 220～250mm heavy slab; With pack into bar plate heating stove heating of blank, coming out of the stove is rolled.The roughing start rolling temperature is at 1060～1160 ℃; The finish rolling start rolling temperature is at 840～940 ℃; Finishing temperature is at 780～820 ℃; Rolled sheet material thickness 10～60mm.Begin to cool down temperature at 760～810 ℃; Stop cooling temperature at 550～650 ℃; Rate of cooling is at 10～17 ℃/s.Its deficiency is: adopt the steel plate heterogeneous microstructure of TMCP explained hereafter inhomogeneous, banded structure is serious, though can be applicable to the offshore platform steel structure building, but not the anti-lamellar tearing steel of a kind of ideal, because its Zz 〉=35%, only satisfy the basic fundamental requirement, rich amount is less, and the problem of lamellar tearing still can take place in construction.Another Chinese patent application number is 94115981.7 document, it discloses a kind of " being suitable for the Seawate-corrosive-resisting steel and the manufacture method thereof of the many wet environments of high temperature ", quicken cooling by the cooling rate with 3～20 ℃/sec after casting, the hot rolling, stop to quicken cooling, air cooling then 400 ℃～600 ℃ temperature ranges.Its deficiency is: micro alloying element is too many, comprise restive element N, REM etc., not easy to operate in the smelting process, restive its composition precision, increased the production difficulty, improved cost, and adopted in the forming process and roll back control cooling rate process for cooling, reduced plant factor and production efficiency, be difficult in actual production process, apply.Chinese patent application number is 200610024963.0 to disclose " a kind of anti-seawater and humid environment corrosion steel ", and its chemical ingredients is: C:0.06%～0.09%, Si:0.20%～0.50%, Mn:0.30%～0.40%, Cr:1.00%～1.20%, Al:0.40%～0.60%, Mo:0.25%～0.35%, P≤0.015%, S≤0.010%, Cu≤0.15%, Ni≤0.20%, Ti≤0.020%, Sn≤0.020%, As≤0.020%, Pb≤0.0025%, Bi≤0.010%, Sb≤0.004%, [N]≤0.030%, [O]≤0.0025%, [H]≤0.00015%, surplus is Fe and unavoidable impurities.Similarly, another Chinese patent application 200610024179.X discloses " a kind of Seawate-corrosive-resisting steel and production method thereof ", the chemical ingredients of these two Seawate-corrosive-resisting steel patented technologies is very complicated, and restive alloying element proposed accuracy requirement, significantly increased production difficulty and cost.Expensive Alloy Elements Mo content is higher in the steel, is a kind of uneconomic steel grade, and Al content is very high in the steel, bring very big difficulty for this steel grade of production, especially in casting cycle, formation contain the Al oxide compound and nitride stops up the casting mouth of a river easily, cause industrial accident.
Summary of the invention
The objective of the invention is to overcome the deficiency of the similar steel plate that has patented technology and military service now, a kind of excellent anti lamellar tearing performance that has is provided, and make the tensile strength 〉=520MPa of steel according to the described production method of the application, thickness direction stretching relative reduction in area Zz 〉=55%, component and technology are simple, the engineering steel and the production method thereof of the anti-lamellar tearing of lower-cost energy
Realize the technical measures of above-mentioned purpose:
The engineering steel of anti-lamellar tearing excellent property, its chemical ingredients is by weight percentage: C:0.05～0.35%, Si:0.01%～0.85%, Mn:0.30%～1.50%, P≤0.015%, S≤0.008%, Cr:0.15%～0.85%, Ni:0.10%～0.55%, Zr:0.005～0.055%, surplus Fe and unavoidable impurities, and chemical ingredients satisfies following relational expression:
(1)：C+Cr≤2Mn+Ni≤3.50％
(2)：C+S≤Zr+Cr≤0.85％
It is: the chemical ingredients of preferred C, Si, Zr is by weight percentage: C:0.07～0.20%, Si:0.08～0.45%, Zr:0.01～0.035%.
Produce the method for the engineering steel of anti-lamellar tearing excellent property: it is: in the smelting process of routine: adopt Argon, vacuum system refining, the steel billet soaking temperature: 1150 ℃～1300 ℃, soaking time was at least 3 hours; The reversable mill operation of rolling: start rolling temperature control is at least 1100 ℃, and finishing temperature is controlled at: 850 ℃～950 ℃, under 860 ℃～960 ℃ conditions, carry out normalizing thermal treatment, and naturally cool to normal temperature.
The setting of main alloy element content of the present invention and manufacture method, the following principle of foundation:
For the steel plate that adopts the continuous casting steel billet rolling thickness greater than 15mm because the influence of strand center segregation, inclusion or harmful element causes the steel plate tear resistance to reduce, have in addition can not satisfy construction requirement.Usefulness steel thickness such as marine drilling platform, large-scale oceangoing vessel, bridge, Highrise buildings generally are higher than 15mm, and bigger in construction process light plate cold deformation amount, if the steel plate tear resistance is inferior, steel construction in use will ftracture, and causes the accident.
The key that the present invention solves the steel plate tearing defect is to adopt an amount of Zr to handle, carry out effectively rotten to the inevitable impurity that exists in the steel, the formation particle is tiny, disperse distributes and rounded inclusion, eliminate harmful inclusion of concentrating distribution, particle big (general diameter 〉=5 μ m), simultaneously, reduce steel billet alloying element segregation degree, improve steel, avoid the finished product steel plate in processing and use, phenomenon to occur tearing.Set chemical ingredients and satisfy relational expression C+Cr≤2Mn+Ni, purpose is the effect by alloying element Mn and Ni, reduces the segregation degree of C, Cr in the steel, otherwise, if C, Cr segregation are serious, after rolling, can form serious banded structure, easily form Cr at crystal boundary
xC
ySeries compound, the reduction crystal boundary causes the tear resistance step-down bad.Set 2Mn+Ni≤3.50%, purpose is satisfying under the prerequisite of tear resistance, reduces the content of steel interalloy element M n, Ni as far as possible, reduces production costs, and improves steel grade and smelts efficient.
Nonmetal sulfide inclusion easy deformation in the steel, elongate along rolling direction, destroyed metallic continuity in the steel, very easily cause steel plate to tear, therefore set C+S≤Zr+Cr, by adding an amount of alloy element Zr, Cr, contain the segregation of C in the steel on the one hand, on the other hand, sulfide in the steel is carried out effectively rotten, become harmful inclusion and be harmless inclusion, can increase substantially the tear resistance of steel, but Zr belongs to precious metal element, so set Zr+Cr≤0.85%, purpose is under the prerequisite that satisfies working condition and plate quality, reduce steel interalloy constituent content as far as possible, reduce the production difficulty, on the other hand, reduce production costs.
Below select the reason of each alloying element and composition range in the summary steel of the present invention.
Tear resistance engineering steel kind general requirement steel plate thickness is greater than 15mm, and maximum ga(u)ge can reach 300mm.As everyone knows, the intensity of steel generally reduces with the increase of thickness.And C is a gap strengthening element comparatively effective, economic in the steel, certain C content can ensure the intensity of steel in the control steel, but too high C content can increase the segregation degree, reduce tear resistance, and the fracture toughness property of steel is significantly reduced, the mechanical property of overall equilbrium steel and tear resistance are so be defined as the span of C content: 0.05-0.35%.
Si is a kind of displacement strengthening element of cheapness, add the intensity that can significantly improve steel in the steel, though the tear resistance influence to steel is little, if but Si content is higher in the steel, can make the toughness of steel, low-temperature flexibility is obviously reduced, and the intensity of comprehensive steel and the consideration of toughness two aspects are defined as 0.01-0.85%. with the composition range of Si
Mn not only can increase the intensity of steel, can also reduce the transformation temperature of steel, by the controlled rolling process, crystal grain thinning, improve its fracture toughness property simultaneously in the intensity that improves steel, but, then can form a fairly large number of MnS if Mn content is higher in the steel, reduce the tear resistance of steel, so the scope of Mn content is set at 0.30-1.50%.
Add The addition of C r in the steel, can suppress to encircle the C atomic diffusion, reduce the segregation of C, help the raising of tear resistance, on the other hand, proper C r can improve the intensity of steel.But excessive Cr content can form along the carbide of the netted Cr of crystal boundary distribution, causes the fragility of steel to increase, and reduces the tear resistance of steel, so the Cr content range is set at 0.15%～0.85%.
Ni is little to the intensity contribution in the steel, but can improve toughness, the especially low-temperature flexibility of steel, and adds an amount of Ni in the steel, can suppress the diffusion of other alloying element, reduces the alloying element segregation, improves tear resistance.Because of Ni is a noble element, and resource scarcity, if add-on is too much, increase production cost, cause unnecessary waste, so the Ni content range is set at 0.10%～0.55%.
Zr is to harmful highly effective alloying element of inclusion metamorphism in the steel, thick in the steel, the concentrated distribution can be gone bad into harmless inclusion with non-circular inclusion, significantly improves the tear resistance of steel.The fusing point of Zr is higher, if excessive adding increases the production difficulty, improves production cost, so the scope of Zr is set at 0.005～0.055%.
P, S are deleterious impurity elements in the steel, reduce the toughness of steel, content is low more good more, but if limit its content low excessively, can increase the production difficulty, improve production cost, therefore under the prerequisite of the antiscour abrasion performance that does not influence steel, with steel get P, S content is each defined in P≤0.015% and S≤0.010% normal ranges.
Below sketch the principle of production method institute foundation:
The manufacture method smelting process of steel adopts Argon, vacuum concise, and purpose is to reduce [O] in the steel, [N], [H] obnoxious flavour of etc.ing, and evenly composition is concise by vacuum cycle, is harmful to inclusion in the steel and floats in the molten steel surface slag purify hot metal on fully.
The steel billet soaking temperature: 1150 ℃～1300 ℃, soaking time at least 3 hours, sufficiently high temperature and time is guaranteed the whole austenitizings in steel billet top layer and centre, is convenient to rollingly, makes under the high temperature the abundant refinement of coarse grain that forms, and improves the performance of steel.Start rolling temperature is set at is at least 1100 ℃,,, have some and second precipitate mutually and separate out, in the operation of rolling, crack, cause waste product because set lowly generally 1100 ℃-1280 ℃ beginning roughing.On the other hand, reduce if start rolling temperature is crossed the low final rolling temperature that will cause, low excessively finishing temperature easily forms the thick especially crystal grain of part, makes the mechanical property of steel reduce.Finishing temperature is set in 850 ℃～950 ℃ scopes, because this temperature range is in the non-recrystallization zone operation of rolling, can obtain good microtexture and ideal comprehensive mechanical property in that this temperature range is rolling.Carry out normalizing thermal treatment 860 ℃～960 ℃ temperature ranges at last, improve heterogeneous microstructure, make and organize further homogenizing, improve the anti-lamellar tearing performance of steel.
Steel of the present invention and manufacturing technology thereof have following advantage:
1. chemical ingredients is simple relatively, and production process is operated easily, and production cost is lower.
2. has good tear resistance.
Embodiment
Produce the method for the engineering steel of anti-lamellar tearing excellent property according to the application: in the smelting process of routine: adopt Argon, vacuum system refining, the steel billet soaking temperature: 1150 ℃～1300 ℃, soaking time was at least 3 hours; The reversable mill operation of rolling: start rolling temperature control is at least 1100 ℃, finishing temperature is controlled at: 850 ℃～950 ℃, under 860 ℃～960 ℃ conditions, carry out normalizing thermal treatment, naturally cool to normal temperature, at the design of components claimed range, smelted 6 batches of embodiment of the invention steel, its component value data see Table 1, and table 2 is the detected result table of technological process, antagonism lamellar tearing performance Zz and the tensile strength of production steel of the present invention.As seen from Table 2, lamellar tearing performance Zz 〉=55% of steel of the present invention shows that it has good anti-lamellar tearing performance.Compared steel 7 is not because chemical ingredients satisfies relational expression (1), not only tensile strength is lower than 520MPa, and anti-lamellar tearing performance Zz is lower, be 33% only, 35%. compared steel 8 that do not reach general specification are not because chemical ingredients satisfies relational expression (2), though tensile strength is higher than 520MPa, but anti-lamellar tearing performance Zz is very low, be 28%, lamellar tearing takes place in the engineering-built process easily, construction quality is difficult to ensure.
Table 1. embodiment of the invention chemical ingredients (massfraction %)
The main technique condition and the tear resistance of table 2. production embodiment of the invention steel
Claims (3)
1. the engineering steel of anti-lamellar tearing excellent property, its chemical ingredients is by weight percentage: C:0.05～0.35%, Si:0.01%～0.85%, Mn:0.30%～1.50%, P≤0.015%, S≤0.008%, Cr:0.15%～0.85%, Ni:0.10%～0.55%, Zr:0.005～0.055%, surplus Fe and unavoidable impurities, and chemical ingredients satisfies following relational expression:
(1)：C+Cr≤2Mn+Ni≤3.50％
(2)：C+S≤Zr+Cr≤0.85％
2. according to the engineering steel of the described anti-lamellar tearing excellent property of claim 1, it is characterized in that: the chemical ingredients of preferred C, Si, Zr is by weight percentage: C:0.07～0.20%, Si:0.08～0.45%, Zr:0.01～0.035%.
3. the method for the engineering steel of the described anti-lamellar tearing excellent property of production claim 1: it is characterized in that: in the smelting process of routine: adopt Argon, vacuum system refining, the steel billet soaking temperature: 1150 ℃～1300 ℃, soaking time was at least 3 hours; The reversable mill operation of rolling: start rolling temperature control is at least 1100 ℃, and finishing temperature is controlled at: 850 ℃～950 ℃, under 860 ℃～960 ℃ conditions, carry out normalizing thermal treatment, and naturally cool to normal temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100637220A CN101643885B (en) | 2009-08-25 | 2009-08-25 | Engineering steel with excellent lamellar tearing resisting performance and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100637220A CN101643885B (en) | 2009-08-25 | 2009-08-25 | Engineering steel with excellent lamellar tearing resisting performance and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101643885A true CN101643885A (en) | 2010-02-10 |
| CN101643885B CN101643885B (en) | 2011-03-30 |
Family
ID=41655945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100637220A Expired - Fee Related CN101643885B (en) | 2009-08-25 | 2009-08-25 | Engineering steel with excellent lamellar tearing resisting performance and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101643885B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111321348A (en) * | 2020-03-30 | 2020-06-23 | 南京钢铁股份有限公司 | L-shaped steel of rib plate for LNG ship and manufacturing method thereof |
| CN114875311A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 420 MPa-grade low-yield-ratio steel for ocean engineering and production method thereof |
-
2009
- 2009-08-25 CN CN2009100637220A patent/CN101643885B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111321348A (en) * | 2020-03-30 | 2020-06-23 | 南京钢铁股份有限公司 | L-shaped steel of rib plate for LNG ship and manufacturing method thereof |
| CN111321348B (en) * | 2020-03-30 | 2022-01-11 | 南京钢铁股份有限公司 | L-shaped steel of rib plate for LNG ship and manufacturing method thereof |
| CN114875311A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 420 MPa-grade low-yield-ratio steel for ocean engineering and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101643885B (en) | 2011-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110565016B (en) | 630MPa high-strength anti-seismic index reinforcing steel bar and production method thereof | |
| CN101768698B (en) | Low cost yield strength 700MPA level non-tempering processing high strength steel plate and manufacturing method thereof | |
| CN100503864C (en) | Method for producing ultra-fine grain steel plate by medium and thin slab continuous casting and rolling | |
| CN111088451A (en) | 600 MPa-level steel bar for reinforced concrete and production method thereof | |
| WO2022022066A1 (en) | Steel board for polar marine engineering and preparation method therefor | |
| CN101921965A (en) | Low-cost non-quenched and tempered high-strength weathering steel with yield strength level of 700MPa and manufacturing method thereof | |
| CN103361569A (en) | Ultralow temperature weather-proof structural steel plate and production method thereof | |
| CN106435406B (en) | A kind of Millettia pachycarpa weather-resistant steel plate and its manufacturing method | |
| CN113278879B (en) | Atmospheric corrosion resistant 800 MPa-grade thin-specification high-strength weather-resistant steel plate and production method thereof | |
| CN105695870A (en) | thick hot rolled sheet steel with 450MPa grade yield strength and manufacturing method thereof | |
| CN114411061B (en) | High-strength anti-seismic steel bar and preparation method thereof | |
| CN101956141A (en) | Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof | |
| CN108728757A (en) | Low-temperature L450M pipeline steel and manufacturing method thereof | |
| CN110423949A (en) | A kind of copper bearing steel and production method of the surface without peeling defect | |
| CN104018063B (en) | The production method of low-alloy high-strength Q420C medium plates | |
| CN106086630B (en) | A kind of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase and its manufacture method | |
| CN115161551A (en) | High-strength high-formability super-atmospheric corrosion resistant steel and manufacturing method thereof | |
| CN102418047B (en) | Non-quenched and tempered fatigue-resistant steel plate and manufacturing method thereof | |
| CN108728728A (en) | High manganese steel with extremely low yield ratio and manufacturing method thereof | |
| CN109913754A (en) | A kind of the IF cold-rolled steel and production method of tensile strength >=440MPa | |
| CN113198851A (en) | Production method of hot-rolled pickled sheet of enamel steel | |
| CN101643885B (en) | Engineering steel with excellent lamellar tearing resisting performance and production method thereof | |
| CN105112810B (en) | Steel for high heat input resisting welding and preparation method thereof | |
| CN112111690B (en) | Thin-specification high-strength container plate and preparation method thereof | |
| CN101348879A (en) | 100mm low alloy high strength ultra heavy plate and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 Termination date: 20160825 |