CN105624554B - A kind of effective steel plate of 70 grades of SA671 electro-fusion weldings and manufacturing method with good hic resistance characteristic - Google Patents
A kind of effective steel plate of 70 grades of SA671 electro-fusion weldings and manufacturing method with good hic resistance characteristic 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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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- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
A kind of effective steel plate of 70 grades of SA671 electro-fusion weldings and manufacturing method with good hic resistance characteristic, the chemical component weight percentage of the steel plate are：C：0.09~0.15%, Si：0.15~0.40%, Mn：1.10~1.50%, Cu：0.05~0.25%, Ni：0.05~0.40%, Mo：0.05~0.12%, Nb：0.005~0.020%, V：0.005~0.030%, P≤0.008%, S≤0.002%, remaining is Fe and inevitable impurity, and above-mentioned element need to meet following relation：As 0.0005%≤S≤0.002%, 2.0≤Ca/S≤4.0；As S ＜ 0.0005%, Ca≤0.002%；485≤RMCeq≤575, Ceq≤0.43%.The steel plate that the present invention produces has good hic resistance characteristic and anti-SSCC characteristics, good high temperature resistance and long time PWHT characteristic and excellent low-temperature flexibility and weldability, and manufacturability is strong, and production cost is relatively low.
Description
Technical field
The present invention relates to the steel plate production technologies in iron and steel metallurgical industry and the processing and manufacturing skill of middle low temperature electro-fusion welding pipe
Art, and in particular to a kind of effective steel plate of 70 grades of SA671 electro-fusion weldings and manufacturing method with good hic resistance characteristic.
Background technology
SA671 is related room temperature and low temperature electricity consumption in American Society of Mechanical Engineers Boiler and Pressure Vessel Code ASME
The product specification of melting welding pipe, wherein SA671CC70 and SA571CD70 are its 70 grades of fine grain normal carbon killed steel and 70 respectively
Grade fine crystalline carbon silicon manganese killed steel.As classical SA671 steel grades, SA671CC70 and SA671CD70 are extensive in foreign applications.And
At home, due to being set between the conventional components system of ASME and the conventional components system of national standard GB150, GB713 there is some
Therefore difference in meter theory, occurs before the two American Standard steel grades in seldom relevant industries at home.
However, with the generous panel products of recent year and oil, the excess capacity day of complete equipment of chemical equipment manufacture
It is beneficial serious, international market is moved towards, it is imperative to be competed to overseas market.It follows that in recent years at home, using U.S.
The welded tube that state's ASME standards, European Union's EN standards are ordered goods, such as thickness is in the SA671CC70 and SA671CD70 of 8~50mm, need
It asks also in rapid increase.
The two corresponding steel plate trades mark of electric smelting welded tube trade mark institute of SA671CC70 and SA671CD70 are respectively ASME specifications
In fine grain normal carbon killed steel SA516Gr.70 and fine grain carbon silicon manganese killed steel SA537Cl.1.As just boiler
Steel plate for container, SA516Gr.70 and SA537Cl.1 in ASME specifications be it is relatively common, Q345R in GB713 therewith compared with
It is close, there are the production capacity of SA516Gr.70 and SA537Cl.1 and production qualification in domestic main Heavy plate production producer.So
And the product competition that international market is included including SA671 electric smelting welded tubes is equally very fierce, merely by cost advantage very
Hardly possible obtains competitiveness in the market in overseas, can only turn to by the bells and whistles of product quality and product to open up a market.
It is very different due to the Service Environment of all kinds of electric smelting welded tubes and using medium, to electric smelting welded tube and its steel used
The requirement of plate also has great difference.For example, containing H2Hydrogen cause easily occurs for the electro-fusion welding tube capacity used in S corrosive medium environment
It cracks (hereinafter referred to as HIC), the material failure phenomenon that sulfide corrosion cracking (hereinafter referred to as SSCC) is characteristic feature, for this purpose,
Designer just uses electric smelting welded tube steel plate to propose the requirement with good hic resistance, SSCC characteristics.With wall thickness 8~
Exemplified by 70 grades of SA671 electric smelting welded tubes (the steel pipe trade mark is respectively SA671CC70 and CD70) of 50mm, steel plate used is respectively 8
The SA516Gr.70 and SA537Cl.1 of~50mm.The requirement that designer carries both steel plates, except ASME specifications should be met
Outside the custom requirements of middle SA516Gr.70 and SA537Cl.1, it can be added toward contact and propose following one or more requirements：Well
Hic resistance, anti-SSCC characteristics, low-temperature flexibility, weldability and PWHT characteristics during good high temperature resistance and long.
Chinese patent CN201310497333.5 disclose a kind of 450MPa grades of resistance against hydrogen cracking steel heavy plate for pressure vessels and
Its production method for the boilers and pressure vessel steel plate that tensile strength is 450MPa ranks, devises weight percent
For C：0.13~0.14%, Si：0.20~0.30%, Mn：0.90~0.95%, the chemistry of P≤0.008% and S≤0.001%
Ingredient, devise two benches using 2.0 times of thickness controlled rolling, roll after using 10~12 DEG C/S cooling rates acceleration cooling control
The cold technique of control is rolled, offline normalizing heat treatment technique is devised, the tensile strength of steel plate is finally made to have reached 450~464MPa, by force
It is relatively low to spend rank, is not reaching to the requirement of common SA516Gr.70 and SA537Cl.1 steel plates tensile strength >=485MPa, and this is specially
PWHT characteristics when profit is also not involved with anti-SSCC characteristics, -62 DEG C of low-temperature flexibilities and the high temperature resistance and long of steel plate.
Chinese patent CN201010572979.1 discloses a kind of with good hic resistance steels for pressure vessel use Q345R-Z35
Special heavy plate and its manufacturing method, for the boiler vessel GBQ345R-Z35 super-thick steel plates that tensile strength is 490MPa grades, design
Weight percent is C≤0.20%, Si≤0.55%, Mn：1.2~1.6%, P≤0.025%, S≤0.005%, (Nb+
V+Ti)≤0.10% and the chemical composition of Al >=0.015%, devise two benches using 2.0 times of thickness controlled rolling, roll after
The cooling controlling and rolling controlling process cooled down using the acceleration of 3~10 DEG C/S cooling rates, devises common offline normalizing heat treatment technique, finally
Make armor plate strength rank suitable with SA537Cl.1, and equally there is good hic resistance characteristic, but the chemistry designed by the invention
C, Si, Mn content are all higher in ingredient, it is difficult to ensure the requirement of Ceq≤0.43%；Its rolling mill practice employs controlled rolling and controlled cooling work
Skill, PWHT characteristics have detrimental effect when the technique is to the high temperature resistance and long of steel plate.
Chinese patent CN201210055848.5 discloses a kind of resistance against hydrogen cracking steels for pressure vessel use and its manufacturing method,
It is the Low-carbon High Strength low-alloy steel plate of >=620MPa for tensile strength, devises weight percent as C：0.15~
0.25%th, Si：0.10~0.30%, Mn：1.00~1.60%, P≤0.012%, S≤0.002%, Mo：0.35~0.60%,
V≤0.05%, Ni：0.20~0.80%, Ca：0.0013~0.0045% and Al：0.002~0.050% chemical composition, if
The heat treatment process of quenching+tempering is counted, to produce tensile strength for more than 620MPa and with good Properties of HIC resistance
Low-alloy high-strength quenched and tempered steel, but its ingredient be the low-alloy high-strength steel containing noble elements such as Mo, Ni ingredient, it is impossible to use next life
Produce the effective general carbon of SA671 electro-fusion weldings or carbon manganese steel plate.In addition, using the heat treatment process production of quenching+tempering because needing
Dual heat treatment, production cost are higher.
The content of the invention
It is an object of the invention to provide a kind of effective steel plate of 70 grades of SA671 electro-fusion weldings with good hic resistance characteristic and
Manufacturing method, for produce the 70 of 8~50mm grades of SA671 electric smelting welded tubes (the steel pipe trade mark be respectively SA671CC70 and
SA671CD70 SA516Gr.70 the and SA537Cl.1 steel plates needed for), the steel plate have good hic resistance characteristic, good
Anti- SSCC characteristics, low-temperature impact-resistant toughness, good high temperature resistance and long time PWHT (post weld heat treatment) characteristic and good weldering
Connecing property, and its manufacturability is strong, production cost is relatively low.
In order to achieve the above objectives, the technical scheme is that：
A kind of 70 grades of effective steel plates of SA671 electro-fusion weldings with good hic resistance characteristic, chemical component weight percentage
For：C：0.09~0.15%, Si：0.15~0.40%, Mn：1.10~1.50%, Cu：0.05~0.25%, Ni：0.05~
0.40%th, Mo：0.05~0.12%, Nb：0.005~0.020%, V：0.005~0.030%, P≤0.008%, S≤
0.002%, remaining is Fe and inevitable impurity, and above-mentioned element need to meet following relation：
(1) as 0.0005%≤S≤0.002%, 2.0≤Ca/S≤4.0；
As S ＜ 0.0005%, Ca≤0.002%；
(2) 485≤RMCeq≤575, wherein,
RMCeq=720*C+100* (Mn+Si)+35* (Cu+Ni)+500*Nb+260*V+250；
(3) Ceq≤0.43%, wherein, Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15.
Further, 70 grades of effective steel plates of SA671 electro-fusion weldings with good hic resistance characteristic, metallographic structure be：
Close to steel plate upper and lower surface, at least account in the thickness range of overall thickness 20%, metallographic structure is with acicular ferrite and bayesian
Based on body, the ratio shared by the two reaches more than 50%, and without apparent banded structure；Metallographic group in remaining region of steel plate
It is woven to carbon manganese steel " normalizing " tissue based on ferrite+pearlite.
Effective steel plate crack length rate CLR≤5% of 70 grades of SA671 electro-fusion weldings of the present invention, crack thickness rate CTR≤
1.5%th, crack-sensitivity rate CSR≤0.5%；Load 80% yield strength load impregnate 720 it is small when after be not broken；Through 620
DEG C × 8 it is small when PWHT after, still meet above-mentioned performance requirement.
The present invention, which is calculated as below element in formula and meets, represents corresponding element weight percent × 100：
RMCeq=720*C+100* (Mn+S)+35* (Cu+Ni)+500*Nb+260*V+260；
Element in formula is calculated as below and meets the weight percent for representing corresponding element：
Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15.
In the composition design of the present invention：
C、Si、Mn：C, Si, Mn are cheap intensified element, for the intensity index for ensureing steel plate and through high temperature for a long time
Intensity index after post weld heat treatment (PWHT), C, Si, Mn content should be suitably high.However, the raising confrontation of C, Si, Mn content
HIC performances, anti-SSCC performances and weldability can have detrimental effect, and C, Si element are also unfavorable for low-temperature flexibility.Therefore, from
Properties of HIC resistance, anti-SSCC performances, low-temperature flexibility and solderable performance perspective consider, C, Si content should control as far as possible low one
A bit.From the point of view of management easy to produce, the content of C, Si and Mn should be able to also meet SA516Gr.70 and SA537Cl.1 simultaneously
Standard requirement, i.e. ingredient bound should meet the intersection that SA516Gr.70 and SA537Cl.1 the two standards require.Except this it
Outside, the content of C, Si and Mn must also consider the influence to metallographic structure needed for the present invention, such as：Ensureing the intensity index of steel plate
On the premise of the intensity index after high temperature long-time PWHT, appropriate reduction C content and meanwhile suitably increase Mn, Si contain
Amount, be conducive to ratio required for forming the present invention under specific heat treatment process conditions, using acicular ferrite and bainite as
Main metallographic structure.In summary, present invention design C：0.09~0.15%, Si：0.15~0.40% and Mn：1.10~
1.50%.
Cu：Cu is intensified element, and PWHT performances have when the increase of Cu contents is to steel plate Properties of HIC resistance, high temperature resistance and long
Significantly positive to influence, however, Cu is precious metal element, and brings the welding performance of steel plate detrimental effect, ASME is related
In standard, corresponding ceiling restriction has also been made to the content of Cu.Therefore, Cu contents are designed as 0.05~0.25% in the present invention.
Ni：Ni is to improve low-temperature flexibility element, meanwhile, in the case where Cu contents are higher, keep the Ni members of enough contents
It is known as and is beneficial to prevent Cu elements from brittleness being brought to deteriorate.However, Ni is also noble element, in ASME relevant criterions, to the content of Ni
Also corresponding ceiling restriction has been made.In addition, Ni contents should also meet the requirement of SA516Gr.70 and SA537Cl.1 standards simultaneously.Cause
This, Ni contents are 0.05~0.40% in the present invention.
Mo、Nb、V：Mo, Nb, V are intensified element, have significant positive influence on PWHT performances during high temperature resistance and long, so
And Mo, Nb, V are precious metal elements, and detrimental effect is brought to the welding performance of steel plate, it is right in ASME relevant criterions
The content of Mo, V have also made corresponding ceiling restriction.In addition, Mo, Nb and V content must also meet SA516Gr.70 and
The standard requirement of SA537Cl.1.Therefore, present invention design：Mo：0.05~0.12%, Nb：0.005~0.020%, V：0.005
~0.030%.
S：S is harmful element in steel, and content increase has the Properties of HIC resistance of steel, anti-SSCC performances and low-temperature flexibility aobvious
The negative effect of work.To obtain low-temperature flexibilities below good Properties of HIC resistance and -62 DEG C, in the present invention control of S content requirements exist
Less than 0.002%.
P：P is harmful element in steel, and content increase has negative effect to the low-temperature flexibility of steel, to obtain good -62
Low-temperature flexibility below DEG C, the present invention in P content requirement control below 0.008%.
Ca：Ca is to be added in the form of feeding Ca among molten steel, except playing deoxidation, taking off as deoxidier, desulfurizing agent
Outside the effect of sulphur, also MnS sulfides are played with spheroidizing, and then can significantly promote hic resistance, the SSCC of steel
Energy.On the other hand, the deoxidation of Ca, desulfurization product are also the non-metallic inclusion in steel in itself, if cannot in external refining and
It effectively floats in casting cycle and removes or discharge and remain in steel, hic resistance, the SSCC performances of steel can also be generated negative
Face is rung, and therefore, the content of Ca is nor hic resistance, SSCC performances more high more that be conducive to be promoted steel, suitable Ca contents should
According to the height of actual S contents in steel, dynamically it is adjusted.S contents are higher in steel, then should add to be conducive into Ca elements
The spheroidising of MnS sulfides；S contents are relatively low in steel, then should lack and add in Ca or even without Ca processing.
In summary, following control requirement is proposed in the present invention to Ca elements：As 0.0005%≤S≤0.002%,
2.0≤Ca/S≤4.0；As S ＜ 0.0005%, Ca≤0.002%.
Present invention control 485≤RMCeq≤575：RMCeq is strength equivalent, and dimensionless is proposed by the present invention peculiar general
It reads, for ensureing using ingredient, the steel plate that comes out of technique productions designed by the present invention, after specific PWHT, steel plate
Tensile strength can meet SA516Gr.70 and SA537Cl.1 standard requirement.I.e.：As 485≤RMCeq≤575, using this
The steel plate that the designed Composition And Process of invention is produced, after the PWHT when 620 DEG C × 8 is small, the tensile strength of steel plate
The standard requirement of SA516Gr.70 and SA537Cl.1 can be met；Conversely, it then not necessarily disclosure satisfy that.
Ceq：Carbon equivalent Ceq is the index of a reflection steel welding performance.It is well known that Ceq is lower, to improving steel plate
Weldability it is more favourable but then more unfavorable to the intensity of steel plate.Using traditional handicraft, 70 grades of SA671 electric smelting welded tubes of 50mm thickness
It is proof strength with steel plate, Ceq generally requires control more than 0.43%, but in this way, will give the welding performance band of steel plate
Detrimental effect is carried out.To ensure that steel plate has good welding performance, the present invention claims Ceq≤0.43%, wherein：Ceq=C
+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15。
The manufacturing method of 70 grades of effective steel plates of SA671 electro-fusion weldings of the present invention with good hic resistance characteristic, including
Following steps：
1) smelt, cast
It is smelted by above-mentioned chemical composition, external refining and continuous casting, wherein, the thickness of blank is finished steel plate thickness
4 times or more；
2) heat, roll
Roughing, controlled rolling are carried out after heating strand, in During Controlled Rolling, strand open rolling thickness is not less than finished steel plate thickness
2.0 again；Start rolling temperature is controlled at 830~920 DEG C；Finishing temperature control is at 770~830 DEG C；At least there are three the deformations of passage
Amount >=8%；
3) it is heat-treated
Normalizing temperature be 880~930 DEG C, soaking time be finished steel plate thickness × (1~3) minute, finished steel plate thickness
Unit mm；After normalizing, water cooling, at 5~30 DEG C/sec, final cooling temperature is controlled at 560~680 DEG C for cooling velocity control.
For SA516Gr.70 and SA537Cl.1 steel plates proposed by the present invention, devise used in a kind of production steel plate
Smelting, external refining and the continuous casting process of blank, wherein, the thickness for producing blank used in above two steel plate should be finished steel plate
4 times or more of thickness, preferably at 6 times or more.
In the rolling mill practice of the present invention, the heating of continuous casting material is rolled and then used using the heating process of plain C-Mn steel
Two-phase control rolling technique, the first stage, second stage was then using following control using plain C-Mn steel identical roughing rolling mill practice
Roll process：Open rolling thickness should be not less than 2.0 times of finished steel plate thickness, be preferably not less than 2.5 times of finished steel plate thickness；It opens
Rolling temperature should control at 830~920 DEG C, be preferably 850~890 DEG C；Finishing temperature control is preferably 780 at 770~830 DEG C
~820 DEG C；In second stage, the deflection at least there are three passage should >=8%, the preferably at least deflection there are three passage
>=10%.
The present invention is after blank rolls into steel plate, using the heat treatment process for accelerating cooling after normalizing, so as to further thin
Change crystal grain, reduce banded structure, control acicular ferrite and bainite proportion in the range of the present invention needs.Specifically
For：Normalizing temperature is 880~930 DEG C, is preferably 900~910 DEG C；Soaking time is finished steel plate thickness × (1~3) minute,
Finished steel plate thickness unit mm is preferably finished steel plate thickness × (1.2~2) minute.After steel plate goes out normalizing furnace, spray can be passed through
Water or the mode of spraying carry out the cooling of the acceleration after normalizing, and cooling velocity should be controlled in the range of 5~30 DEG C/sec, are preferably 8
Within the scope of~20 DEG C/sec；Final cooling temperature should be controlled at 560~680 DEG C, be preferably 610~650 DEG C.Wherein, final cooling temperature is
Utilize the temperature value on 1/4 position in the steel plate thickness calculated with mathematical model.
It is handled by above-mentioned manufacturing process, the metallographic structure for obtaining steel is by steel plate：Close to steel plate upper and lower surface, account for
In the thickness range of overall thickness at least 20%, in metallographic structure, the ratio shared by acicular ferrite and bainite reaches 50%
More than, and without apparent banded structure in the thickness range.Metallographic structure in remaining thickness area of steel plate is then with iron
Traditional carbon manganese steel " normalizing " tissue based on ferritic+pearlite.
Compared with the normalized steel metallographic structure based on traditional " ferrite+pearlite ", metallographic structure of the invention by
Nearly surface of steel plate, account for overall thickness at least 20% thickness range in form a rare banded structure, rare " hydrogen trap "
Isolated area band, can play the role of block hydrogen ion to steel plate center " intrusion ", so as to substantially improve the Properties of HIC resistance of steel；
And in the metallographic structure of the present invention, the ratio shared by acicular ferrite and bainite is higher, is conducive to before equal carbon equivalent
It puts, improves the tensile strength and yield strength of steel.
SA516Gr.70 the and SA537Cl.1 steel plates that the present invention is produced according to the requirement of mentioned component design and processes,
Every product characteristic of the steel plate also meets electric smelting welded tube in addition to the custom requirements of symbol SA516Gr.70 and SA537Cl.1
Following multinomial additional properties needed for SA671CC70 and SA671CD70：
(1) good hic resistance characteristic, it is desirable that according in NACE TM0248 solution A impregnate 96 it is small when after, crack length
Rate CLR≤5%, crack thickness rate CTR≤1.5%, crack-sensitivity rate CSR≤0.5% etc.；
(2) good anti-SSCC characteristics, it is desirable that according to the solution A in NACE TM0177, using B methods, loading 80% is bent
Take intensity load, impregnate 720 it is small when after be not broken；
(3) requirement of good low-temperature impact toughness, -62 DEG C of low temperature Charpy-V impact powers are averagely not less than 27J；
(4) PWHT characteristics during good high temperature resistance and long, it is desirable that after the PWHT (post weld heat treatment) when 620 DEG C × 8 is small, steel
The traditional performance and Properties of HIC resistance of plate, anti-SSCC performances remain to meet aforementioned claim.
Beneficial effects of the present invention：
The present invention devises the effective SA516Gr.70 and SA537Cl.1 steel plates of 70 grades of SA671 electro-fusion weldings, which removes energy
Meet in ASME specifications outside the basic demand of common SA516Gr.70 and SA537Cl.1 properties of product, also with good anti-
HIC characteristics, good anti-SSCC characteristics, good low-temperature toughness, good weldability.
After PWHT (post weld heat treatment) of the steel plate of the present invention when 620 DEG C × 8 is small, the traditional performance and hic resistance of steel plate
Performance, anti-SSCC performances, low-temperature impact toughness remain to meet aforementioned claim, PWHT characteristics when having good high temperature resistance and long；Also
It is cold using accelerating after normalizing with good manufacturability and relatively low production cost, particularly heat treatment process of the present invention
But technique, but achieved the effect that quenching+tempering technique.
Description of the drawings
Fig. 1 is metallographic structure photo of the 36mm steel plates on the 4mm thickness positions of surface in the embodiment of the present invention 1.
Specific embodiment
With reference to embodiment and attached drawing, the present invention will be further described.
Embodiment 1
Certain project is the SA671CC70 electric smelting welded tubes of manufacture 36mm wall thickness, needs 36mm thickness SA516Gr.70 steel plates, and another item
Mesh is to manufacture the SA671CD70 electric smelting welded tubes that wall thickness is 12mm, then needs 12mm thickness SA537Cl.1 steel plates.The steel of the two specifications
Plate is in addition to carbon equivalent Ceq≤0.43% is required, other specific requirements such as table 1.
In the present embodiment, the chemical composition of actual blank is as shown in table 2, and specific fabrication process parameters are as shown in table 3, specifically
Process is as follows：
Above-mentioned sotck thinkness is 250mm, has been more than 6 times with the ratio between finished steel plate thickness；The heating of the blank is using common
The heating process of carbon manganese steel, rolling then use two-phase control rolling technique.Wherein, the first stage is using identical thick of plain C-Mn steel
Rolling mill practice is rolled, second stage then uses following controlled rolling process：The open rolling thickness of 36mm steel plates be 90mm, start rolling temperature 860
DEG C, finishing temperature control finally rolls into the rolled plate of 36mm, and the deflection that there are 3 continuous passages in period is more than at 810 DEG C
10%；The open rolling thickness of 12mm steel plates is 40mm, and start rolling temperature is 880 DEG C, and finishing temperature control is finally rolled at 785 DEG C
The rolled plate of 12mm, and the deflection that there are 3 passages in period has been more than 10%.
36mm the and 12mm steel plates that above-mentioned blank rolls into accelerate the technique of cooling to be heat-treated after using normalizing, wherein：
The normalizing temperature of 36mm steel plates is 900 DEG C, and soaking time is 48 minutes；After steel plate goes out normalizing furnace, carried out just by spray mode
Acceleration cooling after fire, 15 DEG C/sec of cooling velocity, final cooling temperature (utilize in the steel plate thickness calculated with mathematical model 1/4
The temperature value put) it is 630 DEG C；The normalizing temperature of 12mm steel plates is 900 DEG C, and soaking time is 20 minutes；Steel plate goes out normalizing furnace
Afterwards, the acceleration after normalizing is carried out by spray mode to cool down, 30 DEG C/sec of cooling velocity, final cooling temperature (is utilized with mathematical model
Temperature value in the steel plate thickness calculated on 1/4 position) it is 610 DEG C.
After the processing of above-mentioned heat treatment process, 36mm steel plates are in the thickness range close to each about 8mm of steel plate, upper and lower surface
Interior, the ratio shared by acicular ferrite and bainite has all reached more than 50%, and the not apparent band in the thickness range
Shape tissue, metallographic structure are as shown in Figure 1.
Above-mentioned 36mm SA516Gr.70 steel plates and 12mm thickness SA537Cl.1 steel plates have carried out machine according to ASME relevant criterions
Tool performance detection, be specifically, HIC experiment, it is desirable that according in NACE TM0248 solution A impregnate 96 it is small when after, detection crackle it is long
Degree rate CLR, crack thickness rate CTR, crack-sensitivity rate CSR etc.；SSCC is tested, it is desirable that according to the solution A in NACE TM0177,
Using B methods, 80% yield strength load is loaded, when immersion 720 is small；PWHT characteristics during high temperature resistance and long, it is desirable that through 620 DEG C × 8
After the PWHT (post weld heat treatment) of hour, the performance of steel plate is detected.The result shows that properties have all reached predeterminated target, specifically
Testing result is as shown in table 4.
Embodiment 2
Certain project is to manufacture the SA671CD70 electric smelting welded tubes that wall thickness is 50mm, then needs 50mm thickness SA537Cl.1 steel plates.Steel
Plate is in addition to carbon equivalent Ceq≤0.43% is required, other specific requirements such as table 1.
In the present embodiment, the chemical composition of actual blank is as shown in table 2, and specific fabrication process parameters are as shown in table 3, other
With embodiment 1.
After thermally treated process, 50mm steel plates are in close steel plate, the upper and lower surface respectively thickness range of about 10mm, pin
Ratio shared by columnar ferrite and bainite has all reached more than 50%, and without apparent banding group in the thickness range
It knits, metallographic structure is similar to Fig. 1.
The present embodiment 50mm SA537Cl.1 steel plates have carried out mechanical performance detection according to ASME relevant criterions, specific with real
Example 1 is applied, testing result is as shown in table 4.
Embodiment 3
Certain project is to manufacture the SA671CC70 electric smelting welded tubes that wall thickness is 8mm, then needs 8mm thickness SA516Gr.70 steel plates.Steel plate
In addition to carbon equivalent Ceq≤0.43% is required, other specific requirements such as table 1.
In the present embodiment, the chemical composition of actual blank is as shown in table 2, and specific fabrication process parameters are as shown in table 3, other
With embodiment 1.
After thermally treated process, 8mm steel plates are in close steel plate, the upper and lower surface respectively thickness range of about 1.6mm, pin
Ratio shared by columnar ferrite and bainite has all reached more than 50%, and without apparent banding group in the thickness range
It knits, metallographic structure is similar to Fig. 1.
The present embodiment 8mm thickness SA516Gr.70 steel plates have carried out mechanical performance detection according to ASME relevant criterions, specific same
Embodiment 1, testing result is as shown in table 4..
Embodiment 4
Certain project is to manufacture the SA671CD70 electric smelting welded tubes that wall thickness is 8mm, then needs 8mm thickness SA537Cl.1 steel plates.Steel plate
In addition to carbon equivalent Ceq≤0.43% is required, other specific requirements such as table 1.
In the present embodiment, the chemical composition of actual blank is as shown in table 2, and specific fabrication process parameters are as shown in table 3, other
With embodiment 1.
After thermally treated process, 8mm steel plates are in close steel plate, the upper and lower surface respectively thickness range of about 1.6mm, pin
Ratio shared by columnar ferrite and bainite has all reached more than 50%, and without apparent banding group in the thickness range
It knits, metallographic structure is similar to Fig. 1.
The present embodiment 8mm thickness SA537Cl.1 steel plates have carried out mechanical performance detection according to ASME relevant criterions, specific with real
Example 1 is applied, testing result is as shown in table 4.
Embodiment 5
Certain project is to manufacture the SA671CC70 electric smelting welded tubes that wall thickness is 50mm, then needs 6mm thickness SA516Gr.70 steel plates.Steel
Plate is in addition to carbon equivalent Ceq≤0.43% is required, other specific requirements such as table 1.
In the present embodiment, the chemical composition of actual blank is as shown in table 2, and specific fabrication process parameters are as shown in table 3, other
With embodiment 1.
After thermally treated process, 50mm steel plates are in close steel plate, the upper and lower surface respectively thickness range of about 10mm, pin
Ratio shared by columnar ferrite and bainite has all reached more than 50%, and without apparent banding group in the thickness range
It knits, metallographic structure is similar to Fig. 1.
The present embodiment 50mm thickness SA516Gr.70 steel plates have carried out mechanical performance detection according to ASME relevant criterions, specific same
Embodiment 1, testing result is as shown in table 4.
As shown in Table 4, SA516Gr.70 the and SA537Cl.1 steel plates that prepared by the present invention, properties all reach
The predeterminated target of table 1, specifically：In addition to the custom requirements of symbol SA516Gr.70 and SA537Cl.1, also meet electric smelting welded tube
SA671CC70 and SA671CD70 meets following multinomial additional properties：
(1) good hic resistance characteristic, it is desirable that according in NACE TM0248 solution A impregnate 96 it is small when after, crack length
Rate CLR≤5%, crack thickness rate CTR≤1.5%, crack-sensitivity rate CSR≤0.5% etc.；
(2) good anti-SSCC characteristics, it is desirable that according to the solution A in NACE TM0177, using B methods, loading 80% is bent
Take intensity load, impregnate 720 it is small when after be not broken；
(3) requirement of good low-temperature impact toughness, -62 DEG C of low temperature Charpy-V impact powers are averagely not less than 27J；
(4) PWHT characteristics during good high temperature resistance and long, it is desirable that after the PWHT (post weld heat treatment) when 620 DEG C × 8 is small, steel
The traditional performance and Properties of HIC resistance of plate, anti-SSCC performances remain to meet aforementioned claim.
Claims (10)
1. a kind of 70 grades of effective steel plates of SA671 electro-fusion weldings with good hic resistance characteristic, chemical component weight percentage are：
C：0.09~0.15%, Si：0.15~0.40%, Mn：1.10~1.50%, Cu：0.05~0.25%, Ni：0.05~
0.40%th, Mo：0.05~0.12%, Nb：0.005~0.020%, V：0.005~0.030%, P≤0.008%, S≤
0.002%, remaining is Fe and inevitable impurity, and above-mentioned element need to meet following relation simultaneously：
1) as 0.0005%≤S≤0.002%, 2.0≤Ca/S≤4.0；
As S ＜ 0.0005%, Ca≤0.002%；
2) 485≤RMCeq≤575, wherein,
RMCeq=720*C+100* (Mn+Si)+35* (Cu+Ni)+500*Nb+260*V+250；
3) Ceq≤0.43%, wherein, Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15；
The metallographic structure of the effective steel plate of 70 grades of SA671 electro-fusion weldings：Close to steel plate upper and lower surface, at least account for overall thickness
In 20% thickness range, acicular ferrite and the ratio shared by bainite reach more than 50% in metallographic structure, and do not have
Apparent banded structure；Metallographic structure in remaining region of steel plate is carbon manganese steel " normalizing " group based on ferrite+pearlite
It knits；
Effective steel plate crack length rate CLR≤5% of 70 grades of SA671 electro-fusion weldings, crack thickness rate CTR≤1.5%, crackle are quick
Sense rate CSR≤0.5%；Load 80% yield strength load impregnate 720 it is small when after be not broken；When small through 620 DEG C × 8
After PWHT, still meet above-mentioned performance requirement.
2. as claim 1 any one of them has the manufacture of 70 grades of effective steel plates of SA671 electro-fusion weldings of good hic resistance characteristic
Method includes the following steps：
1) smelt, cast
The chemical composition as described in claim 1 is smelted, external refining and continuous casting, wherein, the thickness of blank is finished steel plate
4 times or more of thickness；
2) hot rolling
Roughing, controlled rolling are carried out after heating strand, in During Controlled Rolling, strand open rolling thickness is not less than 2.0 times of finished steel plate thickness；
Start rolling temperature is 830~920 DEG C；Finishing temperature is 770~830 DEG C, at least deflection >=8% there are three passage；
3) it is heat-treated
Normalizing temperature be 880~930 DEG C, soaking time be finished steel plate thickness × (1~3) minute, finished steel plate thickness unit
mm；After normalizing, water cooling, cooling velocity is 5~30 DEG C/sec, and final cooling temperature is 560~680 DEG C.
3. the manufacturer of 70 grades of effective steel plates of SA671 electro-fusion weldings according to claim 2 with good hic resistance characteristic
Method, which is characterized in that in step 1), the thickness of blank is 6 times or more of finished steel plate thickness.
4. the manufacturer of 70 grades of effective steel plates of SA671 electro-fusion weldings according to claim 2 with good hic resistance characteristic
Method, which is characterized in that in step 2), strand open rolling thickness is not less than 2.5 times of finished product thickness.
5. the manufacturer of 70 grades of effective steel plates of SA671 electro-fusion weldings according to claim 2 with good hic resistance characteristic
Method, which is characterized in that in step 2), start rolling temperature is 850~890 DEG C.
6. the manufacturer of 70 grades of effective steel plates of SA671 electro-fusion weldings according to claim 2 with good hic resistance characteristic
Method, which is characterized in that in step 2), finishing temperature is 780~820 DEG C.
7. the manufacturer of 70 grades of effective steel plates of SA671 electro-fusion weldings according to claim 2 with good hic resistance characteristic
Method, which is characterized in that in step 2), at least there are three deflection >=10% of passage during control.
8. the manufacturer of 70 grades of effective steel plates of SA671 electro-fusion weldings according to claim 2 with good hic resistance characteristic
Method, which is characterized in that in step 3), normalizing temperature is 900~910 DEG C；Soaking time is finished steel plate thickness × (1.2~2)
Minute, finished steel plate thickness unit mm.
9. the manufacturer of 70 grades of effective steel plates of SA671 electro-fusion weldings according to claim 2 with good hic resistance characteristic
Method, which is characterized in that in step 3), cooling velocity is 8~20 DEG C/sec.
10. the manufacturer of 70 grades of effective steel plates of SA671 electro-fusion weldings according to claim 2 with good hic resistance characteristic
Method, which is characterized in that in step 3), final cooling temperature is 620~650 DEG C.
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