CN108660381B - A kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection - Google Patents
A kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection 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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention discloses a kind of low-cost manufacture methods for protecting Q345B grades of steel plates of flaw detection, its chemical constituent and mass percentage content are as follows: C 0.15-0.20%, Si 0.15-0.50%, Mn 0.50-0.90%, P≤0.035%, S≤0.025%, Ti 0.020-0.060%, Als 0.015-0.035%, remaining is Fe and inevitable impurity；When preparation, KR desulfurization process is carried out to molten iron first, and is transferred to converter smelting to the molten iron deslagging after desulfurization, then by molten iron, to the molten steel continuous casting after outbound, rolling, finally by inspection by sampling after the steel plate stacking slow cooling 24-72h rolled；The chemical component and simple production process of Q345B grades of steel plate prepared by the present invention, production cost is low, and detection capability is good, has good application and promotion prospect.
Description
Technical field
The present invention relates to structural alloy steel manufacturing technology field, specifically a kind of low cost for protecting Q345B grades of steel plates of flaw detection
Manufacturing method.
Background technique
Q345 is a kind of low-carbon alloy steel (C < 0.2%), good combination property, low temperature performance well, cold stamping performance, weldability
Can be good with machinability, it is widely used in bridge, vehicle, ship, building, pressure vessel etc..
For the performance and flaw detection qualification rate for guaranteeing Q345B grades of steel plates, the current way of domestic iron and steel enterprises is to pass through at present
C, the big first usually control performance of Si, Mn, P, S five, it is clean to improve molten steel with production procedures such as BOF-LF-CC or BOF-LF-RH-CC
Cleanliness, to guarantee the flaw detection qualification rate of steel plate, these process flows ensure that the quality of steel plate, but manganese alloy additional amount
Greatly, production procedure is long, in addition, potassium steel casting blank crystal grains are coarse, center segregation is relatively serious, and the operation of rolling needs controlled rolling and controlled cooling,
Cause production cost relatively high, it is inadaptable with the energy-saving main trend of current steel industry, increase being produced into for enterprise
This.
Chinese invention patent discloses a kind of production method of Q345B steel plate application No. is 201210180268.9, should
The emphasis emphasized in application is to use TMCP rolling mill practice to carry out rolling to guarantee plate property to reduce cost of alloy, at setting up separately
It is calculated as C:0.14-0.19%, Si:0.25-0.37%, Mn:1.1-1.2%, P:0.006-0.019%, S:0.001-0.010%, Nb:
0.012-0.018%, Ti:0.01-0.02%, slab Mn content is up to 1.1-1.2%, and alloying component also contains Nb, Ti content phase
To lower, this considerably increases the cost of alloy of Q345B.
Chinese invention patent discloses a kind of high titanium low cost Q345B hot rolling acid-cleaning application No. is 201610311382.9
Plate and its production method, ingredient be designed as C:0.12-0.16%, Si≤0.35%, Mn:0.1-0.5%, P≤0.020%, S≤
0.015%, Als:0.015-0.040%, Ti:0.045-0.070%, N≤0.006%, although though ingredient design is than this patent cost
It is lower, but this application preparation is acid-cleaning plate, and thickness is thin, is not suitable for protecting the cut deal steel plate of the Q345B grade of flaw detection.
In view of Q345B grades of steel plate above shortcomings, a kind of low cost manufacturing side for protecting Q345B grades of steel plates of flaw detection is researched and developed
Method has a very important significance.
Summary of the invention
Present invention aim to solve at present as the performance and flaw detection qualification rate that guarantee Q345B grades of steel plates, manganese alloy
Additional amount is big, leads to that production procedure is long, production cost is relatively high, provides and a kind of protects the low of Q345B grades of steel plates of detecting a flaw
Cost manufacturing method.
The present invention is achieved through the following technical solutions:
A kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection, the chemical constituent and quality of the Q345B grades of steel plate
Degree are as follows: C 0.15-0.20%, Si 0.15-0.50%, Mn 0.50-0.90%, P≤0.035%, S≤0.025%, Ti
0.020-0.060%, Als 0.015-0.035%, remaining is Fe and inevitable impurity, and manufacturing method includes following step
It is rapid:
(1) molten iron KR desulfurization process
Mass fraction P≤0.150%, S≤0.050%, and the molten iron of temperature T >=1280 DEG C are blended into hot-metal bottle, then
By molten iron, desulfurization is pre-processed again using KR, S≤0.005% in molten iron after processing, and molten iron is blended into desulfurization slag before converter from iron
At least 2/3 is removed in water pot；
(2) converter smelting
1. the molten iron after desulfurization is entered top and bottom combined blown converter smelting, Dephosphorising agent is added and is reduced to the phosphorus content in molten iron
P≤0.030%, the control of converter finishing slag basicity are 3.0-3.5；
2. calcium carbide, Fluorspar Powder is added before converter tapping in ladle, additional amount is respectively molten steel 1.4-1.5kg calcium carbide per ton
With 0.6-0.7kg Fluorspar Powder, lime is added in tapping process into molten steel, the additional amount of the lime is molten steel 1.9- per ton
2.1kg；
3. starting that SiFe, MnFe are added into molten steel after tapping 1/3 and ferro-titanium carrying out deoxidation alloying, molten steel is controlled
In ingredient are as follows: C 0.15-0.20%, Si 0.15-0.50%, Mn 0.50-0.90%, P≤0.035%, S≤0.025%, Ti
0.020-0.060%, Als 0.015-0.035%, remaining is Fe and inevitable impurity；
4. argon station operates: the flow that argon gas is controlled after entering the station is 800-1000L/min, after stirring 30-60s, adjusts argon gas
Flow decides whether to add deoxidier according to the content of the free oxygen in molten steel, works as steel to 200-400L/min soft blow argon state
Aluminum steel deoxidier is added when free oxygen content > 20ppm in water and continues deoxidation；As free oxygen content≤20ppm in molten steel
Ferrotianium is added, ferrotianium increases argon flow to 300-500L/min after adding, continue to stir sample detection after 30-90s, in molten steel
Each chemical component meet the requirements after, add silicon-calcium wire and carry out Calcium treatment, the additional amount of the silicon-calcium wire is 150-200m, calcium
After treatment soft blow argon >=10min；
(3) continuous casting
Controlling tapping temperature is 1640-1655 DEG C, and molten steel is casting continuously to form slab；
(4) it rolls
Slab is rinsed with water, the phosphorus on surface is removed, controls compression ratio >=3.0, preferentially on earth using transverse rolling broadening, axial rolling
Rolling mode, the operation of rolling controls start rolling temperature≤1110 DEG C, and 900-970 DEG C of finishing temperature, roller repairing, red temperature is
620±20℃；Line flaw detection is carried out to the steel plate after rolling, meets standard GB/T/T2970-2004 requirement；
(5) it examines
Inspection by sampling after steel plate stacking slow cooling 24-72h is examined and is carried out by GB/T 1591-2008 requirement.
Preferably, the chemical constituent and mass percentage content of heretofore described steel plate are as follows: C 0.18%, Si 0.36%,
Mn 0.74%, P 0.022%, S 0.018%, Als 0.026%, Ti 0.027%, remaining is Fe and inevitable impurity.
Preferably, heretofore described steel plate with a thickness of 10-60mm.
Preferably, the main component of heretofore described Dephosphorising agent is lime.
The present invention has following innovative point:
(1) low-alloyed additional amount is dropped for manganese with titanium
Guarantee the performance of steel plate by the way that the micro-alloying technology of ferrotianium is added.Micro carbonitride can be generated effectively
Invigoration effect, microalloy element niobium, vanadium, titanium are extremely effective intensified element in steel.The invigoration effect of microalloy element is main
There are two types of modes: first is that the precipitation strength of refinement carbonitride can get precipitated phase by Precipitation in micro alloyed steel
Particle, reciprocation occurs for tiny, disperse precipitated phase and dislocation in steel, causes the obstruction to dislocation motion, makes the strong of steel
Degree is improved；Second is that the intensity of steel, but also energy had not only can be improved in the refined crystalline strengthening that carbonitride prevents crystal grain from growing up, crystal grain refinement
The toughness of steel is improved, since crystal grain is tiny, external force can be undertaken by more crystal grain, answering near intra-die and crystal boundary
Change degree differs small, material uniform force, and stress concentration is smaller, is not easy to form crackle.Microalloy element niobium, vanadium, titanium all have
Precipitation strength effect and refined crystalline strengthening effect.The precipitation strength of microalloy carbonitride all rises the ductile-brittle transition temperature of steel,
The toughness of steel declines.And the Grain refinement of microalloy carbonitride, decline the ductile-brittle transition temperature of steel, the toughness of steel
It is improved.But the size that microalloy element niobium, vanadium, titanium respectively act on the intensity of steel and toughness is different.The carbon nitrogen of niobium
The decline of ductile-brittle transition temperature caused by compound Grain Refinement Effect counteracts caused by the steel grade compound precipitation strength
The raising of ductile-brittle transition temperature.Since the amplitude of the two is different, total effect is that niobium reduces ductile-brittle transition temperature, improves steel
Toughness.The effect of titanium is identical as niobium, and with the increase of Ti content, the ductile-brittle transition temperature of steel declines, and toughness improves.But quality point
When number is more than a certain quantity (mass fraction is about 0.12%), toughness will decline with the increase of Ti content.The precipitation strength of vanadium
Effect is stronger, causes the decline of toughness larger, and the effect for refining crystal grain is weaker, relatively small to the contribution for improving toughness, no
The decline of precipitation strength toughness can be offset, thus, total effect is the increase with content of vanadium, and the amplitude of toughness decline increases.
These three alloy ferrotianium prices are generally the least expensive currently on the market, comprehensively consider precipitation strength and the refined crystalline strengthening effect using titanium, In
A part of titanium is added in steel come replace manganese guarantee low-alloy steel intensity and toughness be it is feasible, it is right according to this thinking
Each constituent design such as the following table 1 of Q345B steel plate.
1 present invention of table and each component content in Q345B steel plate before improvement
(2) converter tapping process makes top slag
Converter tapping process is added slag charge and makes top slag, so that deoxidation products is floated by Argon appropriate stirring and is captured by top slag
Absorption pushes up Cost Design such as the following table 2 of slag to improve Cleanliness of Molten Steel in the present invention.
The ingredient of slag is pushed up in 2 present invention of table
(3) cancel controlled rolling
According to slab low multiple quality, cancel controlled rolling, not controlled rolling process parameter such as the following table 3.
3 controlled rolling of table and not controlled rolling process parameter
Compared with prior art, the present invention having several advantages that
(1) present invention reduces the alloy addition of Q345B by micro-alloying technology, reduces cost of alloy, subtracts simultaneously
The temperature loss of few deoxidation of molten steel alloying process avoids molten steel into LF furnace heating compensation temperature, after manganese content reduces, slab
The ratio of center segregation C 0.5-C1.5 is increased to 93% or more from 78%.
(2) present invention makes top slag absorption foreign substance in molten steel using tapping process, improves Molten Steel Cleanliness, eliminates LF refining
Process avoids the nitrogen pick-up of LF refining process molten steel, hydrogenation from carrying out liquid steel degassing into RH vacuum drying oven again, guarantees flaw detection qualification rate, reduces
Energy consumption cost；After the present invention reduces the techniques such as LF and RH is refined, controlled rolling is air-cooled simultaneously, experimental stage 219 blocks of steel plates of sampling observation, III
Grade (GB/T2970-2004) flaw detection qualification rate reaches 99.24%, and performance one examines qualification rate and reaches 98.63%, with original process qualification rate
It is close.
(3) present invention is acted on using the few alloy amount and microalloy refined crystalline strengthening of Q345B, and refinement casting blank crystal grains mitigate casting
Base center segregation, to eliminate the controlled rolling and controlled cooling of the operation of rolling, yield when improving the machine of milling train, " BOF-CC- not controlled rolling is not controlled
It is cold " for technique compared with original process, ton steel cost reduces about 100 yuan.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail, convenient for more clearly understanding the present invention, but it
Limiting the invention.
Embodiment 1
A kind of low-cost manufacture method of guarantor Q345B grades of steel plates of flaw detection of the present embodiment, the chemistry of the Q345B grades of steel plate
Component and mass percentage content are as follows: C 0.16%, Si 0.35%, Mn 0.75%, P 0.025%, S 0.012%, Als 0.020,
Ti 0.025%, remaining is Fe and inevitable impurity.For the present embodiment by taking 130 tons of converters as an example, manufacturing method includes following
Step:
(1) molten iron KR desulfurization process
Mass fraction P≤0.150%, S≤0.050%, and the molten iron of temperature T >=1280 DEG C are blended into hot-metal bottle, then
By molten iron, desulfurization is pre-processed again using KR, S≤0.005% in molten iron after processing, and molten iron is blended into desulfurization slag before converter from iron
At least 2/3 is removed in water pot；
(2) converter smelting
1. the molten iron after desulfurization is entered top and bottom combined blown converter smelting, Dephosphorising agent is added and is reduced to the phosphorus content in molten iron
P≤0.030%, the control of converter finishing slag basicity are 3.2；
2. 200kg calcium carbide, 100kg Fluorspar Powder is added before converter tapping in ladle, it is added in tapping process into molten steel
300kg lime；
3. starting that SiFe, MnFe are added into molten steel after tapping 1/3 and ferro-titanium carrying out deoxidation alloying, molten steel is controlled
In ingredient are as follows: C 0.16%, Si 0.35%, Mn 0.75%, P 0.025%, S 0.012%, Als 0.020, Ti 0.025%,
Remaining is Fe and inevitable impurity；
4. argon station operates: the flow that argon gas is controlled after entering the station is 900L/min, and after stirring 30-60s, adjustment argon flow is extremely
300L/min soft blow argon state decides whether to add deoxidier according to the content of the free oxygen in molten steel, when the freedom in molten steel
Aluminum steel deoxidier is added when oxygen content > 20ppm and carries out deoxidation；Ferrotianium is added as free oxygen content≤20ppm in molten steel,
Ferrotianium increases argon flow to 400L/min after adding, continue to sample after stirring 30-90s, each chemical component in molten steel meets
After above-mentioned requirements, adds silicon-calcium wire and carry out Calcium treatment, the additional amount of the silicon-calcium wire is 170m, soft blow argon after Calcium treatment
≥10min；
(3) continuous casting
Controlling tapping temperature is 1640-1655 DEG C, and molten steel is casting continuously to form slab；
(4) it rolls
Slab is rinsed with water, the phosphorus on surface is removed, controls compression ratio >=3.0, preferentially on earth using transverse rolling broadening, axial rolling
Rolling mode, it is 1050 DEG C that the operation of rolling, which controls start rolling temperature, and finishing temperature is 940 DEG C, and roller repairing, red temperature is
628℃；Line flaw detection is carried out to the steel plate after rolling, meets standard GB/T/T 2970-2004 requirement；
(5) it examines
Inspection by sampling after steel plate stacking slow cooling 24-72h is examined and is carried out by GB/T 1591-2008 requirement.
According to the requirement of chemical element component of the present invention, mass percent and production method, five embodiments are prepared for, respectively
For embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5.For verify each chemical constituent and mass percentage content with
And influence of the technological parameter in the operation of rolling to plate property parameter, be prepared for 3 comparative examples, i.e., comparative example 1,
Comparative example 2 and comparative example 3 smelt and have rolled 8 batches of steel plates.Wherein, each chemical constituent of comparative example 1 and
Within the scope of the invention, and the technological parameter in preparation process is not within the scope of the invention for mass percentage content；Comparison
Each chemical constituent and mass percentage content of embodiment 2 not within the scope of the invention, and the technological parameter in preparation process
Within the scope of the invention；Technique in each chemical constituent and mass percentage content and preparation process of comparative example 3
Parameter not within the scope of the invention, according to five embodiments of the method for the present invention and the chemical element of 3 comparative examples
Ingredient percent is referring to table 4, and wherein surplus is Fe and inevitable impurity.Production process control parameter and plate quality
Situation is referring to table 5.
The chemical component of 4 embodiment of the present invention of table and comparative example compares (wt%)
5 embodiment of the present invention of table and the control of comparative example production process are to plate property situation table
It can be seen that from table 4 and table 5, the chemical component and mass percent and production technology mistake of 1-5 of the embodiment of the present invention
The rolling temperature of process control plate property produced is stablized, and yield strength meets national standard (being greater than 345MPa) and requires, III
Grade flaw detection is qualified, and production cost is low (about 450-470 yuan/ton), and comparative example 1, comparative example 2 and comparative example
3 composition of steel range or/and production technology comparison steel plate not produced within the scope of the present invention, although performance is also able to satisfy
Standard requirements, but the cost is relatively high (about 540-560 yuan/ton), complex process.Wherein, prepared by the embodiment of the present invention 4
Plate property it is best, low production cost, detection capability is good, be most preferred embodiment.
Claims (4)
1. a kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection, which is characterized in that the chemical constituent and matter of the steel plate
Measure degree are as follows: C 0.15-0.20%, Si 0.15-0.50%, Mn 0.50-0.90%, P≤0.035%, S≤0.025%,
Ti 0.020-0.060%, Als 0.015-0.035%, remaining is Fe and inevitable impurity, and manufacturing method includes following
Step:
(1) molten iron KR desulfurization process
Mass fraction P≤0.150%, S≤0.050%, and the molten iron of temperature T >=1280 DEG C are blended into hot-metal bottle, then by iron
Desulfurization is pre-processed water again using KR, S≤0.005% in molten iron after processing, and molten iron is blended into desulfurization slag before converter from hot-metal bottle
Middle removal at least 2/3；
(2) converter smelting
1. the molten iron after desulfurization is entered into top and bottom combined blown converter smelting, be added Dephosphorising agent by the phosphorus content in molten iron be reduced to P≤
0.030%, the control of converter finishing slag basicity is 3.0-3.5；
2. before converter tapping in ladle be added calcium carbide, Fluorspar Powder, additional amount be respectively molten steel 1.4-1.5kg calcium carbide per ton and
0.6-0.7kg Fluorspar Powder, lime is added in tapping process into molten steel, and the additional amount of the lime is molten steel 1.9- per ton
2.1kg；
3. starting that SiFe, MnFe are added into molten steel after tapping 1/3 and ferro-titanium carrying out deoxidation alloying, control in molten steel
Ingredient are as follows: C 0.15-0.20%, Si 0.15-0.50%, Mn 0.50-0.90%, P≤0.035%, S≤0.025%, Ti 0.020-
0.060%, Als 0.015-0.035%, remaining is Fe and inevitable impurity；
4. argon station operates: the flow that argon gas is controlled after entering the station is 800-1000L/min, after stirring 30-60s, adjusts argon flow
To 200-400L/min soft blow argon state, decided whether to add deoxidier according to the content of the free oxygen in molten steel, when in molten steel
Free oxygen content > 20ppm when be added aluminum steel deoxidier continue deoxidation；It is added as free oxygen content≤20ppm in molten steel
Ferrotianium, ferrotianium increase argon flow to 300-500L/min after adding, continue to stir sample detection after 30-90s, each in molten steel
After chemical component meets the requirements, adds silicon-calcium wire and carry out Calcium treatment, the additional amount of the silicon-calcium wire is 150-200m, Calcium treatment
After soft blow argon >=10min；
(3) continuous casting
Controlling tapping temperature is 1640-1655 DEG C, and molten steel is casting continuously to form slab；
(4) it rolls
Slab is rinsed with water, the squama on surface is removed, controls compression ratio >=3.0, using transverse rolling broadening, the rolling side of axial rolling on earth
Formula, the operation of rolling control start rolling temperature≤1110 DEG C, and 900-970 DEG C of finishing temperature, roller repairing, red temperature is 620 ± 20
℃；Line flaw detection is carried out to the steel plate after rolling, meets standard GB/T/T2970-2004 requirement；
(5) it examines
Inspection by sampling after steel plate stacking slow cooling 24-72h is examined and is carried out by GB/T 1591-2008 requirement.
2. a kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection according to claim 1, it is characterised in that: institute
State the ingredient of steel plate are as follows: C 0.18%, Si 0.36%, Mn 0.74%, P 0.022%, S 0.018%, Als 0.026%, Ti
0.027%, remaining is Fe and inevitable impurity.
3. a kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection according to claim 1, it is characterised in that: institute
State steel plate with a thickness of 10-60mm.
4. a kind of low-cost manufacture method for protecting Q345B grades of steel plates of flaw detection according to claim 1, it is characterised in that: institute
The main component for stating Dephosphorising agent is lime.
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| CN109338239A (en) * | 2018-11-01 | 2019-02-15 | 宁波钢铁有限公司 | A kind of production method of low-cost and high-performance structural steel |
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| CN110396635A (en) * | 2019-08-02 | 2019-11-01 | 南京钢铁股份有限公司 | A kind of smelting process improving surrender 345MPa level structure steel fatigue life |
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