CN102041436A - Steel plate for low-alloy high-strength structured steel Q460C and production method thereof - Google Patents
Steel plate for low-alloy high-strength structured steel Q460C and production method thereof Download PDFInfo
- Publication number
- CN102041436A CN102041436A CN2010105976676A CN201010597667A CN102041436A CN 102041436 A CN102041436 A CN 102041436A CN 2010105976676 A CN2010105976676 A CN 2010105976676A CN 201010597667 A CN201010597667 A CN 201010597667A CN 102041436 A CN102041436 A CN 102041436A
- Authority
- CN
- China
- Prior art keywords
- steel
- rolling
- percent
- steel plate
- temperature
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a high-strength structured steel plate for a low-alloy series steel material Q460C with the thickness specification lower than 40mm, and a production method thereof. The steel plate comprises the following chemical ingredients in by weight percent (wt%): less than or equal to 0.17 percent of C, less than or equal to 0.40 percent of Si, 1.20 to 1.55 percent of Mn, less than or equal to 0.018 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.20 percent of microalloyed elements comprising V, Nb and Ti, less than or equal to 0.035 percent of Als, and the balance Fe and residual elements. The production method comprises the following steps: molten iron pretreatment, converter smelting, ladle furnace (LF) refining, continuous casting, casting blank heating, rolling, cooling controlling and stacking for slow cooling. Due to the technical scheme, on the premise that the comprehensive quality is ensured, the method has the advantages of low cost, simple process and labor intensity reduction.
Description
Technical field
The present invention relates to the production of steel, be specifically related to the high-strength structure of a kind of low-alloy series steel Q460C thickness specification below 40mm steel steel plate and production method thereof.
Background technology
Low-alloy high-strength structural steel Q460C is on the basis of common low-alloy Series Steel, in order to guarantee the mechanical property of steel plate, in steel, add V, Nb, Ti etc. and carry out microalloying, mainly be for crystal grain thinning, improve the toughness of steel plate, lower carbon equivalent has fully guaranteed the welding property of steel plate.Be mainly used in various heavy construction structures, coal machine industry and desired strength height, lightweight construction that load is big etc.In recent years, the application of Hi-Stren steel is more extensive, and domestic had a large amount of research to this, and how the core low-cost, that high quality has become market competition carries out the height that microalloying has directly determined production cost in the production process.
Summary of the invention
Accomplish to reduce cost under the prerequisite that guarantees steel mechanics performance, optimize technical process, the applicant has dropped into great amount of manpower research TMCP explained hereafter and has made low-alloy high-tensile structural steel, the thermal treatment process of cancellation steel plate.Rolling each time steel plate is carried out the sampling of piece piece carry out the mechanical property detection, grope rolling technology from follow-up results of property, and each block plate carried out composition, technology, tissue, performance analysis, formed a cover from composition design, steel billet smelt, the systemic production technique of steel plate rolling.This technology has solved enterprise's production cost height, and the present situation that the mechanical property surplus capacity is bigger can guarantee high strength, high tenacity and good requirements such as welding property, has reduced cost again, has produced huge economic benefit.
Therefore, purpose of the present invention mainly is in order to provide a kind of thickness in the following guaranteed cost of 40mm, guarantor's flaw detection high-strength structure steel Q460C steel plate and production method thereof.
In order to reach the requirement of steel plate overall quality, the guaranteed cost of the thickness that the present invention takes below 40mm, protect flaw detection low-alloy high-tensile structural steel Q460C steel plate comprise following chemical components in mass percent (unit, wt%):
C :≤0.17, Si :≤0.40, Mn:1.20～1.55, P :≤0.018, S :≤0.005, micro alloying element (V+Nb+Ti) :≤0.20, Als :≤0.035, other is Fe and relict element.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.42.
The main function analysis of above-mentioned chemical element interalloy element is as follows:
C: be most basic strengthening element in the steel, improve intensity, but C influences the welding property of steel and influences toughness.Take all factors into consideration, the content of carbon is hanging down of control as far as possible.
Si: be the solution strengthening element, favourable to the intensity that improves steel plate.
Mn: be the solution strengthening element, all favourable to intensity and the toughness that improves steel plate.
V, Nb, Ti: in steel, can combine, form fine carbide or carbonitride, can play crystal grain thinning and dispersion-strengthened action, thereby reach the net effect of the obdurability of effective raising steel with C, N.
Al: can play the crystal grain thinning strengthening effect.
For achieving the above object, the production method that the present invention takes may further comprise the steps: hot metal pretreatment, converter smelting, LF refining, continuous casting steel machine, strand heating, rolling, cold, the stacking slow cooling of control; In the LF refinement step, liquid steel refining takes the big quantity of slag to carry out slag making, and the white slag hold-time is controlled at more than the 10min; Carry out the alloy fine setting in the refining process, reductor is based on calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel; Refining is guaranteed soft blow time 〉=20min after finishing, and stops to blow cruelly phenomenon and takes place, and Baogang's water superheating temperature is controlled within 15 ± 5 ℃ in guaranteeing; In rolling step, the rolling requirement of " high temperature, low speed, depress greatly ", 1000 ℃～1150 ℃ of start rolling temperatures are adhered in strictness; Adopt TMCP rolling, cool steel thickness is 80～100mm, and for guaranteeing the distortion infiltration, working roll rolling line speed is pressed≤1.5m/s control, and a stage finishing temperature is at 950 ℃～1000 ℃.The two-stage start rolling temperature is below 920 ℃, and the two-stage takes to depress for a short time rolling, guaranteeing original plate shape, and finishing temperature≤860 ℃; In the cold step of control, go into water temp＞760 ℃, return 500～600 ℃ of red temperature controls, cooling rate is controlled at 10～15 ℃/s, is sent to powerful straightener then and carries out hot straightening.
Wherein in the steel-making link; major control point has makes in converter smelting endpoint Composition Control, the refining process that protection cast control, the control of strand cooling in heap, strand add thermal control, the rolling control of strand, ACC control, the control of steel plate cooling in heap in white slag control, microalloying control, the casting process; by advanced person's smelting, rolling technology, the cooling in heap technology of adding strand, steel plate fully guarantees mechanical property, surface quality and the internal soundness of steel plate steel plate.Because the present invention taked technique scheme, under the prerequisite that guarantees overall quality, the present invention has that cost is low, and technology is simple, and reduces the advantage of labour intensity.
Embodiment
The guaranteed cost of the thickness that the present invention takes below 40mm, protect flaw detection low-alloy high-tensile structural steel Q460C steel plate comprise following chemical components in mass percent (unit, wt%):
C :≤0.17, Si :≤0.40, Mn:1.20～1.55, P :≤0.018, S :≤0.005, micro alloying element (V+Nb+Ti) :≤0.20, Als :≤0.035, other is Fe and relict element.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.42.
The production method that the present invention takes may further comprise the steps: hot metal pretreatment, converter smelting, LF refining, continuous casting steel machine, strand heating, rolling, cold, the stacking slow cooling of control; In the LF refinement step, liquid steel refining takes the big quantity of slag to carry out slag making, and the white slag hold-time is controlled at more than the 10min; Carry out the alloy fine setting, reductor is based on calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel; Refining is guaranteed soft blow time 〉=20min after finishing, and stops to blow cruelly phenomenon and takes place, and Baogang's water superheating temperature is controlled within 15 ± 5 ℃ in guaranteeing; In rolling step, the rolling requirement of " high temperature, low speed, depress greatly ", 1000 ℃～1150 ℃ of start rolling temperatures are adhered in strictness; Adopt TMCP rolling, cool steel thickness is 80～100mm, and for guaranteeing the distortion infiltration, working roll rolling line speed is pressed≤1.5m/s control, and a stage finishing temperature is at 950 ℃～1000 ℃.The two-stage start rolling temperature is below 920 ℃, and the two-stage takes to depress for a short time rolling, guaranteeing original plate shape, and finishing temperature≤860 ℃; In the cold step of control, go into water temp＞760 ℃, return 500～600 ℃ of red temperature controls, cooling rate is controlled at 10～15 ℃/s, is sent to powerful straightener then and carries out hot straightening.
One, operational path
The present invention adopts 250mm * 1600mm continuous casting section to produce, and its main technique route is: high-quality molten iron → KR hot metal pretreatment → top and bottom combined blown converter → Argon processing → LF stove refining → 24 hours → walking beam furnace of continuous casting protection cast → strand cooling in heap → 3800m milling train → ACC laminar flow cooling → 11 rollers thermal straightening machine → steel plate cooling in heap → finishing → detection → warehouse-in.
Two, melting chemical composition design
Composition design: for guaranteeing good welding property and good plasticity and toughness, should control carbon equivalent Ceq in 0.43%, carbon, manganese mainly are in order to improve the intensity of steel plate, the compound add-on of Nb ﹑ V ﹑ Ti is controlled between 0.085～0.11%, mainly be for crystal grain thinning, improve steel plate plasticity and toughness.
Three, controlling of production process main points
1, KR hot metal pretreatment technology: the molten iron that arrives at a station must carry out desulfurization, guarantees desulfurized molten iron S≤0.005%, and temperature is greater than 1280 ℃.
2, converter smelting process: go into stove molten iron Si content below 0.60%, molten iron temperature 〉=1270 ℃, the strict high-quality scrap stock that adopt of steel scrap, process rifle position is controlled between 1.0～1.6m, adding model in strict accordance with lime adds, guarantee finishing slag basicity between 3.2～3.5, terminal point C content is controlled at more than 0.06%, and P content is controlled at below 0.015%.Adopt Si-Al-Ba-Ca to carry out pre-deoxidation in the tapping process, tapping adopts floating plug to carry out pushing off the slag early stage, and the later stage adopts slag stop cone to carry out pushing off the slag, slag under forbidding in the tapping process.Molten steel disposable adding aluminum steel behind the argon station, guarantee argon after Als content be controlled between 0.040～0.060%, blow behind the 3min leaving from stationly by force, temperature control leaving from station is more than 1580 ℃.
3, LF refinery practice: liquid steel refining takes the big quantity of slag to carry out slag making, and the white slag hold-time is controlled at more than the 10min; Reductor is based on calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel etc.; Refining is guaranteed soft blow time 〉=20min after finishing, and stops to blow cruelly phenomenon and takes place; The steel temperature is gone up in control according to practical situation, and Baogang's water superheating temperature is controlled within 15 ± 5 ℃ in guaranteeing;
4, continuous casting: guarantee that the casting machine status of equipment is good before watering steel; 15 ± 5 ℃ of middle bag superheating temperature; pulling rate: 0.7m/min; specific water: 0.80L/ ㎏; continuous-casting steel pouring requires the whole process protection casting; unwrap greatly to water in the 1min of back and must overlap protective tube, must guarantee not show of molten steel face in the middle bag casting process.Rationally control stopper Argon amount in the steel pouring process, guarantee that liquid level fluctuation of crystallizer is slight.Strand cutting back is according to cooling in heap standard cooling in heap 〉=24h.
5, heating process point: strand heating III group steel heating process carries out, and considers that there are certain temperature difference in actual furnace temperature of heating furnace and strand, and maximum heating temperature is 1240 ℃.
6, rolling technology: the rolling requirement of " high temperature, low speed, depress greatly ", 1000 ℃～1150 ℃ of start rolling temperatures are adhered in strictness; Adopt TMCP rolling, cool steel thickness is 80-100mm, permeate for guaranteeing distortion,, working roll rolling line speed is pressed≤1.5m/s control, and a stage finishing temperature is at 950 ℃～1000 ℃.The two-stage start rolling temperature is below 920 ℃, and the two-stage takes to depress for a short time rolling, guaranteeing original plate shape, and finishing temperature≤860 ℃.
7, cooling control technology: go into water temp＞760 ℃, return 500～600 ℃ of red temperature controls, cooling rate is controlled at 10～15 ℃/s, is sent to powerful straightener then and carries out hot straightening.
8, retarded cooling process: carry out slow cooling after steel plate rolls off the production line, go into burial pit temperature 〉=300 ℃; The cooling in heap time was greater than 24 hours;
9, detected result
9.1 the steel plate mechanical property detects
Composition and mechanical mechanics property are pressed GB/T1591-2008 and are carried out, and specifically see Table 1.
Table 1 Q460C steel plate mechanical mechanics property
This produces 30 crowdes of the thick Q460C of 20mm altogether as a trial, 21 crowdes of the thick Q460C of 25mm, and 10 crowdes of 40mmQ460C, wherein: yield strength is controlled at 450～590 MPa, has on average reached 504MPa, than the rich 64MPa of standard; Tensile strength is controlled at 570～700 MPa, has on average reached 630MPa, than the rich 80MPa of standard; Elongation is controlled at 17%～24%, on average reaches 20%, than standard affluence 3%; 0 ℃ of V-type ballistic work is controlled at 90～274 J, has on average reached 203 J, and mechanical performance index has satisfied the development requires of Q460C fully.In addition, for the final effect of verifying that this scheme reaches, sample added done-20 ℃ of V-type ballistic works, the result is controlled at 101～244 J, 193 J have on average been reached, show that thus the 20mm of this exploitation, 25mm, 40mm thickness Q460C low-alloy high-strength plate have reached the performance class of Q460D.
9.2 examine outward and carrying out flaw detection
Surface quality requires to press the strict execution of GB/T709-2008;
Flaw detection is carried out GB/T2970-2004 III level non-destructive testing standard and is carried out;
The steel plate of being developed is examined outward, the percentage of A-class goods 100%; The flaw detection percentage of A-class goods 100%, wherein unification level rate is that 75%, three grade of qualification rate is 25%, has reached desired result.
Claims (2)
1. low-alloy high-strength structural steel Q460C steel plate, this steel plate comprise following chemical components in mass percent (unit, wt%):
C :≤0.17, Si :≤0.40, Mn:1.20～1.55, P :≤0.018, S :≤0.005, micro alloying element (V+Nb+Ti) :≤0.20, Als :≤0.035, other is Fe and relict element.
2. production method of low-alloy high-strength structural steel Q460C steel plate according to claim 1, this may further comprise the steps: hot metal pretreatment, converter smelting, LF refining, continuous casting steel machine, strand heating, rolling, cold, the stacking slow cooling of control; It is characterized in that in the LF refinement step liquid steel refining takes the big quantity of slag to carry out slag making, the white slag hold-time is controlled at more than the 10min; Carry out the alloy fine setting, reductor is based on calcium carbide, aluminum shot, ferrosilicon powder, aluminum steel; Refining is guaranteed soft blow time 〉=20min after finishing, and stops to blow cruelly phenomenon and takes place, and Baogang's water superheating temperature is controlled within 15 ± 5 ℃ in guaranteeing; In rolling step, the rolling requirement of " high temperature, low speed, depress greatly ", 1000 ℃～1150 ℃ of start rolling temperatures are adhered in strictness; Adopt TMCP rolling, cool steel thickness is 80-100mm, and for guaranteeing the distortion infiltration, working roll rolling line speed is pressed≤1.5m/s control, and a stage finishing temperature is at 950 ℃～1000 ℃; The two-stage start rolling temperature is below 920 ℃, and the two-stage takes to depress for a short time rolling, guaranteeing original plate shape, and finishing temperature≤860 ℃; In the cold step of control, go into water temp＞760 ℃, return 500～600 ℃ of red temperature controls, cooling rate is controlled at 10～15 ℃/s, is sent to powerful straightener then and carries out hot straightening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105976676A CN102041436A (en) | 2010-12-21 | 2010-12-21 | Steel plate for low-alloy high-strength structured steel Q460C and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105976676A CN102041436A (en) | 2010-12-21 | 2010-12-21 | Steel plate for low-alloy high-strength structured steel Q460C and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102041436A true CN102041436A (en) | 2011-05-04 |
Family
ID=43907981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105976676A Pending CN102041436A (en) | 2010-12-21 | 2010-12-21 | Steel plate for low-alloy high-strength structured steel Q460C and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102041436A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614608A (en) * | 2013-11-25 | 2014-03-05 | 马钢(集团)控股有限公司 | Production method of Q460C-grade high-strength steel |
| CN103614616A (en) * | 2013-11-12 | 2014-03-05 | 唐山曹妃甸区通鑫再生资源回收利用有限公司 | Steel-making cooling cold material-remelted steel and preparation method thereof |
| CN103725959A (en) * | 2013-12-30 | 2014-04-16 | 南阳汉冶特钢有限公司 | 130mm low-alloy low-temperature-toughness thick plate and production method thereof |
| CN103966410A (en) * | 2014-04-21 | 2014-08-06 | 鞍钢股份有限公司 | Method for producing Q420-grade thick plate through high-temperature rolling |
| CN104651716A (en) * | 2015-02-09 | 2015-05-27 | 宝钢集团新疆八一钢铁有限公司 | Production method of low-alloy Q460C steel plate |
| CN105088087A (en) * | 2015-09-18 | 2015-11-25 | 湖南大学 | High-toughness optimal welding micro-alloyed cast steel and preparation method thereof |
| CN108145110A (en) * | 2017-11-24 | 2018-06-12 | 南阳汉冶特钢有限公司 | It is a kind of to reduce the cracked production technology of billet rolling steel plate |
| CN109706403A (en) * | 2019-02-28 | 2019-05-03 | 辽宁科技学院 | A kind of Q460E steel plate and its rolling mill practice |
| CN110016604A (en) * | 2019-05-07 | 2019-07-16 | 南京钢铁股份有限公司 | A kind of smelting process improving plate surface quality |
| CN110735089A (en) * | 2019-11-29 | 2020-01-31 | 新疆八一钢铁股份有限公司 | Production method of weather-resistant bridge steel |
| CN114395730A (en) * | 2021-12-16 | 2022-04-26 | 南阳汉冶特钢有限公司 | Low-cost S460ML steel plate with thickness of 60-100mm and production method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09176782A (en) * | 1995-12-25 | 1997-07-08 | Nippon Steel Corp | Building use high tensile strength steel excellent in fracture resistance and its production |
| CN101613828A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacture method |
| CN101643879A (en) * | 2009-08-19 | 2010-02-10 | 南阳汉冶特钢有限公司 | Wind power flange steel and production process thereof |
| CN101880824A (en) * | 2010-06-14 | 2010-11-10 | 南阳汉冶特钢有限公司 | Q345q-series super-thick bridge steel plate and production method thereof |
-
2010
- 2010-12-21 CN CN2010105976676A patent/CN102041436A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09176782A (en) * | 1995-12-25 | 1997-07-08 | Nippon Steel Corp | Building use high tensile strength steel excellent in fracture resistance and its production |
| CN101613828A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacture method |
| CN101643879A (en) * | 2009-08-19 | 2010-02-10 | 南阳汉冶特钢有限公司 | Wind power flange steel and production process thereof |
| CN101880824A (en) * | 2010-06-14 | 2010-11-10 | 南阳汉冶特钢有限公司 | Q345q-series super-thick bridge steel plate and production method thereof |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614616A (en) * | 2013-11-12 | 2014-03-05 | 唐山曹妃甸区通鑫再生资源回收利用有限公司 | Steel-making cooling cold material-remelted steel and preparation method thereof |
| CN103614608A (en) * | 2013-11-25 | 2014-03-05 | 马钢(集团)控股有限公司 | Production method of Q460C-grade high-strength steel |
| CN103725959A (en) * | 2013-12-30 | 2014-04-16 | 南阳汉冶特钢有限公司 | 130mm low-alloy low-temperature-toughness thick plate and production method thereof |
| CN103966410A (en) * | 2014-04-21 | 2014-08-06 | 鞍钢股份有限公司 | Method for producing Q420-grade thick plate through high-temperature rolling |
| CN104651716A (en) * | 2015-02-09 | 2015-05-27 | 宝钢集团新疆八一钢铁有限公司 | Production method of low-alloy Q460C steel plate |
| CN105088087B (en) * | 2015-09-18 | 2017-01-11 | 湖南大学 | High-toughness optimal welding micro-alloyed cast steel and preparation method thereof |
| CN105088087A (en) * | 2015-09-18 | 2015-11-25 | 湖南大学 | High-toughness optimal welding micro-alloyed cast steel and preparation method thereof |
| CN108145110A (en) * | 2017-11-24 | 2018-06-12 | 南阳汉冶特钢有限公司 | It is a kind of to reduce the cracked production technology of billet rolling steel plate |
| CN108145110B (en) * | 2017-11-24 | 2019-11-22 | 南阳汉冶特钢有限公司 | It is a kind of to reduce the cracked production technology of billet rolling steel plate |
| CN109706403A (en) * | 2019-02-28 | 2019-05-03 | 辽宁科技学院 | A kind of Q460E steel plate and its rolling mill practice |
| CN110016604A (en) * | 2019-05-07 | 2019-07-16 | 南京钢铁股份有限公司 | A kind of smelting process improving plate surface quality |
| CN110735089A (en) * | 2019-11-29 | 2020-01-31 | 新疆八一钢铁股份有限公司 | Production method of weather-resistant bridge steel |
| CN114395730A (en) * | 2021-12-16 | 2022-04-26 | 南阳汉冶特钢有限公司 | Low-cost S460ML steel plate with thickness of 60-100mm and production method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102094148B (en) | Q460D steel for low-alloy high-strength structure of below 50mm and production method thereof | |
| CN102041436A (en) | Steel plate for low-alloy high-strength structured steel Q460C and production method thereof | |
| CN102345057B (en) | High strength and toughness Q460E structural steel thick plate and production method thereof | |
| CN102409236B (en) | Method for producing super-thick steel plate | |
| CN102345062A (en) | Low alloy Q345D steel plate with thickness less than 20mm and ensured flaw detection | |
| CN102418036B (en) | 15MnNiDR low alloy steel plate for low temperature pressure vessel and production method thereof | |
| CN102061424B (en) | Super-thick Q390GJC-Z35 steel plate for high-rise buildings and production method thereof | |
| CN102051522A (en) | Steel plate made of bainite structure high-strength toughness structural steel Q550D(E) and production method thereof | |
| CN102041431A (en) | Q345B protected flaw detection steel plate and production method thereof | |
| CN102041438B (en) | Low-alloy high-strength structural-steel extra-thick board Q460C and production method thereof | |
| CN102345053A (en) | Hot-rolled structural steel ST52 medium-thick plate with thickness of 15-60mm and production method thereof | |
| CN102345059A (en) | High strength low alloy structural normalizing A633GRD steel plate and production method thereof | |
| CN104561783A (en) | Low alloy steel 09MnNiDR steel plate for vessel and production method thereof | |
| CN102041435A (en) | Hot rolling steel plate made of weldable fine grain structural steel S355ML and production method thereof | |
| CN102041441A (en) | Low-alloy medium-thickness steel plate Q345D-Z35 and production process thereof | |
| CN102345055A (en) | Weldable fine grain structural steel S355NL/S355NLZ35 steel plate and its production method | |
| CN102080181A (en) | Low-alloy Q345D thick plate produced without adding micro-alloy elements and production method thereof | |
| CN102345056A (en) | Structural steel S420ML medium and heavy plate and production method thereof | |
| CN102041447A (en) | Q345C steel plate and production method thereof | |
| CN102041432A (en) | Q420GJD-Z35 steel plate with thickness of less than or equal to 60 millimeters for high-rise building and production method thereof | |
| CN102345049A (en) | Low alloy Q345C-Z35 thick plate and production method thereof | |
| CN102367544A (en) | High strength and toughness structural steel S355K2Z35 slab and production method thereof | |
| CN103695769B (en) | A kind of high-strength F H40 Marine Engineering Steel steel plate and production method thereof | |
| CN102828114A (en) | Ocean engineering steel plate with excellent strain ageing performance and method for manufacturing ocean engineering steel plate | |
| CN107557690B (en) | The super-thick steel plate and its manufacturing method of a kind of low temperature resistant and anti-lamellar tearing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110504 |