CN109609846A - 400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method - Google Patents

400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method Download PDF

Info

Publication number
CN109609846A
CN109609846A CN201811553314.9A CN201811553314A CN109609846A CN 109609846 A CN109609846 A CN 109609846A CN 201811553314 A CN201811553314 A CN 201811553314A CN 109609846 A CN109609846 A CN 109609846A
Authority
CN
China
Prior art keywords
reinforcing bar
high nitrogen
continuous casting
combined microalloying
nitrogen combined
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
Application number
CN201811553314.9A
Other languages
Chinese (zh)
Inventor
孙彩凤
孙江波
翟晓毅
徐斌
贯硕磊
冯忠贤
刘斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Handan Iron and Steel Group Co Ltd
HBIS Co Ltd Handan Branch
Original Assignee
Handan Iron and Steel Group Co Ltd
HBIS Co Ltd Handan Branch
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Handan Iron and Steel Group Co Ltd, HBIS Co Ltd Handan Branch filed Critical Handan Iron and Steel Group Co Ltd
Priority to CN201811553314.9A priority Critical patent/CN109609846A/en
Publication of CN109609846A publication Critical patent/CN109609846A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C21C7/0006—Adding metallic additives
    • 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
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • 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

400MPa grades of high nitrogen combined microalloying reinforcing bar of the present invention and its production method, the mass percentage of its chemical component is respectively as follows: C:0.18~0.25, Si:0.40~0.80, Mn:1.30~1.60, P≤0.045, S≤0.045, Nb:0.010~0.040, Ti:0.010~0.040, N:0.0090~0.0150, remaining is iron and inevitable impurity element.After the completion of continuous casting working procedure, continuous casting billet is heated to 1100~1250 DEG C and keeps the temperature 90~150 minutes again, 1000~1100 DEG C are cooled to later to be rolled, water cooling is carried out after rolling, 0.1~0.5Mpa of hydraulic pressure, 920-980 DEG C of temperature on cooling table of control, reinforcing bar enters natural cooling after cold bed, and high nitrogen combined microalloying reinforcing bar is made.The present invention can produce the reinforcing bar for meeting standard requirements while production cost is greatly reduced.

Description

400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method
Technical field
The present invention relates to a kind of reinforcing bar and its production method more particularly to a kind of 400MPa grades of high nitrogen combined microalloying steel Muscle and its production method.
Background technique
Reinforcing bar be most widely used, the steel grade of technology maturation, almost all of iron and steel enterprise can produce.2018, New national standard " concrete reinforcement steel "-GB/T1499.2 issuing and implementation, since new standard requires steel area periphery not allow Now it is different from the ring of internal contrast, therefore limits the production for wearing water reinforcing bar to a certain extent, each steel mill starts largely to use Traditional vanadium microalloy technology produces reinforcing bar, and the price of vanadium alloy is caused to increase increasingly；Meanwhile with national environmental protection renovation dynamics Reinforce, vanadium alloy resource provisioning also be becoming tight by day；Above-mentioned many reasons make the price of vanadium alloy rise sharply, and cause using tradition Vanadium iron or v n micro alloying technique production reinforcing bar cost greatly improve.
To reduce production cost, the micro alloying element that 400Mpa grades of reinforcing bar factories mainly use at present is Nb, V-Nb It is compound, V-Ti is compound and Nb-Ti is compound, wherein cost it is minimum for Nb-Ti it is compound.The patent Shen of Publication No. CN1952199A A kind of " niobium titanium-combined microalloying and its production method " please be disclose, the compound micro- conjunction of niobium titanium is mainly used The technique of aurification produces reinforcing bar, but content of niobium controls more a height of 0.02-0.05wt%, on the one hand this space drops in higher content of niobium Less, it is on the other hand easy to aggravate casting blank crack, and bainite is excessive in tissue, there are steel bar stretchings without quality such as yield point elongations Risk；Using being quickly cooled down after reinforcing bar rolling in the patent application simultaneously, minimum 800 DEG C of temperature on cooling table, so low is upper Cold bed temperature, general manufacturing enterprise are difficult to meet.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of 400MPa grades of high nitrogen combined microalloying reinforcing bar and its lifes Production method using the expensive vanadium of a small amount of niobium, titanium and suitable nitrogen substitution, and improves heating and cooling technique, can be big Width produces the reinforcing bar for meeting standard requirements while reducing production cost.
Solve the technical solution of above-mentioned technical problem are as follows:
400MPa grades of high nitrogen combined microalloying reinforcing bars, the mass percentage of chemical component are respectively as follows: C:0.18~0.25, Si:0.40~0.80, Mn:1.30~1.60, P≤0.045, S≤0.045, Nb:0.010~0.040, Ti:0.010~ 0.040, N:0.0090~0.0150, remaining is iron and inevitable impurity element.
Above-mentioned 400Mpa grade high nitrogen combined microalloying reinforcing bar, the mass percentage of chemical component are preferred are as follows: C: 0.20~0.25, Si:0.40~0.60, Mn:1.40~1.60, P≤0.035, S≤0.035, Nb: 0.010~0.035, Ti: 0.010~0.035, N:0.0090~0.0150, remaining is iron and inevitable impurity element.
The production method of 400Mpa grades of high nitrogen combined microalloying reinforcing bars, including steel making working procedure, refining procedure, continuous casting work Sequence, heating process and rolling process, the chemical component mass percentage of continuous casting billet made of the continuous casting working procedure are as follows: C:0.18 ~0.25, preferably 0.20~0.25；Si:0.40~0.80, preferably 0.40~0.60；Mn:1.30~1.60, preferably 1.40~ 1.60；P≤0.045, preferably P≤0.035；S≤0.045, preferably S≤0.035；Nb:0.010~0.040, preferably 0.010~ 0.035；Ti:0.010~0.040, preferably 0.010~0.035；N:0.0090~0.0150, remaining is for iron and inevitably Impurity element.
The production technology of above-mentioned 400Mpa grade high nitrogen combined microalloying reinforcing bar will be even after the completion of the continuous casting working procedure Slab is heated to 1100~1250 DEG C and keeps the temperature 90~150 minutes again, is cooled to 1000~1100 DEG C later and is rolled, rolling After carry out water cooling, 0.1~0.5Mpa of hydraulic pressure controls 920-980 DEG C of temperature on cooling table, and reinforcing bar enters natural cooling after cold bed, is made High nitrogen combined microalloying reinforcing bar.
The production technology of above-mentioned 400Mpa grade high nitrogen combined microalloying reinforcing bar, the steel making working procedure tapping process use Ferrosilicon, ferro-niobium deoxidation alloying；
The refining procedure, molten steel are sent into refining furnace and carry out refining and trimming, carry out after so that it is met reinforcing bar component requirements Casting, obtains rolling concrete steel bar continuous casting billet.
Theory analysis of the present component with when technique adjustment is as follows:
Carbon of the invention, silicon, manganese content and the 400Mpa grade reinforcing bar in the prior art containing vanadium are substantially suitable, phosphorus, thia prime element Requirement it is also suitable.Present invention employs the niobium of lower content and titanium, suitable nitrogen enhances strengthening effect, to further drop Low cost.Effect of the niobium in reinforcing bar is mainly crystal grain refinement, precipitation strength and phase transformation strengthening；Effect of the titanium in reinforcing bar is main It is crystal grain refinement and precipitation strength；And the nitrogen of certain content is added in steel, it can be further improved the crystal grain of niobium and titanium elements The effect of refinement and precipitation strength.
Although niobium plays the role of crystal grain refinement, precipitation strength in steel, additive amount is more, in high temperature heating conditions Under, solid solution niobium is more, and stabilization of austenite enhancing further improves the harden ability of steel, and it is low to be easy a large amount of bainite of generation Warm phase-change product shows so that reinforcing bar is easy to cause non-yield point occur as therefore the present invention is added to lesser amount of niobium member Element；The present invention also adds a small amount of titanium elements and suitable nitrogen, can be formed under the high temperature conditions highly stable tiny more Dissipate the TiN of distribution, reheating before hot-working during inhibits the crystal grain of austenite to grow up, can compared with the steel of not titaniferous It is rolled under higher heating temperature, reduces mill load, be conducive to improve production efficiency；In addition, rolling after be not required to through The rapid cooling of water is crossed to refine crystal grain, therefore lower to the Capability Requirement of cooling equipment, is suitble to stablize and produce in enormous quantities.
The invention has the benefit that
The present invention uses high nitrogen combined microalloying technique, substitutes valuableness by adding a small amount of niobium, titanium and suitable nitrogen Vanadium, and formulate reasonable heating, cooling parameter, it is ensured that reinforcement yielding intensity 430-480Mpa, tensile strength 619- 672Mpa, strong flexor ratio 1.40-1.46, Stretching 12-18% meet standard requirements, and the tissue of ferrite and pearlite Content >=95%, stress strain curve have obvious yield point elongation；The present invention can significantly reduce production cost, meanwhile, the present invention heats temperature Wider range is spent, can be rolled at high temperature, mill load is reduced, is conducive to improve production efficiency；It is not required to after rolling by water It is quickly cooled down to refine crystal grain, it is lower to the Capability Requirement of cooling equipment, it is suitble to stablize to produce in enormous quantities.
Specific embodiment
Below by Examples 1 to 10, the present invention will be further described.
Examples 1 to 10 uses ferrosilicon, ferro-niobium deoxidation alloying in tapping process, and the molten steel after tapping is sent into refining furnace, It specifies element and content to carry out refining and trimming by table 1, is cast into 150mm square billet after meeting reinforcing bar component requirements；
1 chemical component table of table
150 square billets control 1100~1250 DEG C of billet heating temperature by bar heating furnace, then keep the temperature 90~150 minutes, later It is cooled to 1000~1100 DEG C to be rolled, carries out water cooling after rolling, 0.1~0.5Mpa of hydraulic pressure, control temperature on cooling table 920~ 980 DEG C, reinforcing bar enters natural cooling after cold bed, then shearing, bundling, storage；The technological parameter and reinforcing bar product of Examples 1 to 10 Performance is shown in Table 2；
2 rolling mill practice of table and mechanical property
The measurement that embodiment 1, embodiment 4, embodiment 7 and embodiment 10 carry out each phase constitution occupied area ratio is had chosen, is used Division lines method measures 4 reinforcing bar sample tissue relative quantities, and under 100 power microscopes, measurement is no less than 50 visual fields；4 implementations The tissue relative quantity of reinforcing bar sample is shown in Table 3 in example.
Each phase area ratio of 3 metallographic structure of table
Reinforcement property listed by Examples 1 to 10 fully meets national standard, in metallographic structure ferrite+content of pearlite in alloy be greater than etc. In 95%, ingredient is uniform, performance is stable；Existing production work can be substituted using a small amount of niobium, titanium and suitable nitrogen completely simultaneously Expensive vanadium, is greatly reduced production cost in skill.

Claims (5)

1.400MPa grades of high nitrogen combined microalloying reinforcing bars, it is characterised in that: the mass percentage of the reinforcing bar chemical component It is respectively as follows: C:0.18~0.25, Si:0.40~0.80, Mn:1.30~1.60, P≤0.045, S≤0.045, Nb:0.010~ 0.040, Ti:0.010~0.040, N:0.0090~0.0150, remaining is iron and inevitable impurity element.
2. 400Mpa grades of high nitrogen combined microalloying reinforcing bar as described in claim 1, it is characterised in that: the reinforcing bar chemistry at The mass percentage divided is preferred are as follows: and C:0.20~0.25, Si:0.40~0.60, Mn:1.40~1.60, P≤0.035, S≤ 0.035, Nb: 0.010~0.035, Ti:0.010~0.035, N:0.0090~0.0150, remaining is for iron and inevitably Impurity element.
The production method of 3.400Mpa grades of high nitrogen combined microalloying reinforcing bars, including steel making working procedure, refining procedure, continuous casting working procedure, Heating process and rolling process, it is characterised in that: the mass percentage of continuous casting billet chemical component made of the continuous casting working procedure Are as follows: C:0.18~0.25, preferably 0.20~0.25；Si:0.40~0.80, preferably 0.40~0.60；Mn:1.30~1.60, it is excellent Select 1.40~1.60；P≤0.045, preferably P≤0.035；S≤0.045, preferably S≤0.035；Nb:0.010~0.040, it is excellent Select 0.010~0.035；Ti:0.010~0.040, preferably 0.010~0.035；N:0.0090~0.0150, remaining is for iron and not Evitable impurity element.
4. the production technology of 400Mpa grades of high nitrogen combined microalloying reinforcing bar as claimed in claim 3, it is characterised in that: described After the completion of continuous casting working procedure, continuous casting billet is heated to 1100~1250 DEG C and keeps the temperature 90~150 minutes again, it is cooled to 1000 later~ 1100 DEG C are rolled, and water cooling is carried out after rolling, and 0.1~0.5Mpa of hydraulic pressure controls 920-980 DEG C of temperature on cooling table, and reinforcing bar enters High nitrogen combined microalloying reinforcing bar is made in natural cooling after cold bed.
5. the production technology of 400Mpa grades of high nitrogen combined microalloying reinforcing bar as claimed in claim 3, it is characterised in that: described Steel making working procedure tapping process uses ferrosilicon, ferro-niobium deoxidation alloying；
The refining procedure, molten steel are sent into refining furnace and carry out refining and trimming, carry out after so that it is met reinforcing bar component requirements Casting, obtains rolling concrete steel bar continuous casting billet.
CN201811553314.9A 2018-12-18 2018-12-18 400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method Pending CN109609846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811553314.9A CN109609846A (en) 2018-12-18 2018-12-18 400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811553314.9A CN109609846A (en) 2018-12-18 2018-12-18 400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method

Publications (1)

Publication Number Publication Date
CN109609846A true CN109609846A (en) 2019-04-12

Family

ID=66010548

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811553314.9A Pending CN109609846A (en) 2018-12-18 2018-12-18 400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method

Country Status (1)

Country Link
CN (1) CN109609846A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109913765A (en) * 2019-04-29 2019-06-21 江苏省沙钢钢铁研究院有限公司 400MPa grades of reinforcing bars and its manufacturing method
CN110951938A (en) * 2019-10-16 2020-04-03 邯郸钢铁集团有限责任公司 400 MPa-grade micro-titanium treated spiral shell and production method thereof
CN111041369A (en) * 2019-12-26 2020-04-21 芜湖新兴铸管有限责任公司 Nb-Ti-N microalloyed hot-rolled ribbed steel bar and production method thereof
CN112322978A (en) * 2020-11-04 2021-02-05 江苏永钢集团有限公司 Application process of Ti microalloying in production of 400 MPa-grade reinforcing steel bar
CN113684411A (en) * 2021-08-26 2021-11-23 江苏联峰实业有限公司 Method for solving 400 MPa-level Nb-containing steel bar non-yield platform

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1081936A (en) * 1996-07-15 1998-03-31 Nkk Corp Pc steel bar excellent in uniform elongation and high temperature relaxation characteristic
CN1952199A (en) * 2005-10-17 2007-04-25 马鞍山钢铁股份有限公司 Niobium titanium -combined microalloying steel for cooling-control reinforced bar and method for producing same
CN101423915A (en) * 2008-12-11 2009-05-06 中国钢研科技集团公司 Reinforcement steel bar for medium-high strength hoop for rods for reinforcing concrete and method for producing the same
CN102400044A (en) * 2011-11-22 2012-04-04 莱芜钢铁集团有限公司 Niobium-titanium composite micro-alloyed hotrolled deformed bar and production method thereof
CN102703813A (en) * 2012-06-27 2012-10-03 攀枝花钢城集团有限公司 Vanadium and titanium compound microalloyed steel bar and production method thereof
CN102703811A (en) * 2012-06-27 2012-10-03 攀枝花钢城集团有限公司 Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof
CN107815525A (en) * 2017-11-30 2018-03-20 攀钢集团攀枝花钢铁研究院有限公司 Microalloy containing Nb builds steel wire rod and its production method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1081936A (en) * 1996-07-15 1998-03-31 Nkk Corp Pc steel bar excellent in uniform elongation and high temperature relaxation characteristic
CN1952199A (en) * 2005-10-17 2007-04-25 马鞍山钢铁股份有限公司 Niobium titanium -combined microalloying steel for cooling-control reinforced bar and method for producing same
CN101423915A (en) * 2008-12-11 2009-05-06 中国钢研科技集团公司 Reinforcement steel bar for medium-high strength hoop for rods for reinforcing concrete and method for producing the same
CN102400044A (en) * 2011-11-22 2012-04-04 莱芜钢铁集团有限公司 Niobium-titanium composite micro-alloyed hotrolled deformed bar and production method thereof
CN102703813A (en) * 2012-06-27 2012-10-03 攀枝花钢城集团有限公司 Vanadium and titanium compound microalloyed steel bar and production method thereof
CN102703811A (en) * 2012-06-27 2012-10-03 攀枝花钢城集团有限公司 Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof
CN107815525A (en) * 2017-11-30 2018-03-20 攀钢集团攀枝花钢铁研究院有限公司 Microalloy containing Nb builds steel wire rod and its production method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109913765A (en) * 2019-04-29 2019-06-21 江苏省沙钢钢铁研究院有限公司 400MPa grades of reinforcing bars and its manufacturing method
CN110951938A (en) * 2019-10-16 2020-04-03 邯郸钢铁集团有限责任公司 400 MPa-grade micro-titanium treated spiral shell and production method thereof
CN111041369A (en) * 2019-12-26 2020-04-21 芜湖新兴铸管有限责任公司 Nb-Ti-N microalloyed hot-rolled ribbed steel bar and production method thereof
CN112322978A (en) * 2020-11-04 2021-02-05 江苏永钢集团有限公司 Application process of Ti microalloying in production of 400 MPa-grade reinforcing steel bar
CN113684411A (en) * 2021-08-26 2021-11-23 江苏联峰实业有限公司 Method for solving 400 MPa-level Nb-containing steel bar non-yield platform

Similar Documents

Publication Publication Date Title
CN100395368C (en) Niobium titanium -combined microalloying steel for cooling-control reinforced bar and method for producing same
CN109609846A (en) 400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method
CN100465321C (en) Trace niobium -containing steel for cooling-control reinforced bar and method for producing same
CN106636917B (en) A kind of HRB600E contains the high-strength hot-rolled anti-seismic steel bar of vanadium and production method
CN109576583A (en) 500MPa grades of high nitrogen combined microalloying reinforcing bars and its production method
CN102703811B (en) Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof
CN102703813B (en) Vanadium and titanium compound microalloyed steel bar and production method thereof
CN102965574B (en) Titanium microalloying hot-rolling thick steel plate with low yield ratio and high strength and production process of steel plate
CN102618799B (en) High-performance quenched and tempered steel plate with 80 kg carbon equivalent and manufacturing method of high-performance quenched and tempered steel plate
CN110684931B (en) Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar
CN102943212A (en) NM500 high-strength wear-resistant steel plate and heat treatment technique thereof
CN102618784B (en) 60kg-level low-cost and high-toughness steel plate and production method thereof
CN104294162A (en) Twisted steel for 785 MPa-level high-strength prestressed structure and preparation method of twisted steel
CN102011047A (en) Production method of steel plate for pressure vessel with low cost and high performance
CN103255342A (en) 600Mpa-grade high-strength hot continuous rolling structural steel and manufacturing method thereof
CN106319336A (en) Low-carbon high-chromium abrasion-resistant ball and preparation technique thereof
CN109112399A (en) A kind of E420 marine worker steel plate that center portion low-temperature impact toughness is excellent and its manufacturing method
CN104233074A (en) Steel for chromium-containing vanadium-nitrogen micro-alloyed 400MPa level reinforcing steel bar and production method thereof
CN102409233A (en) Low-temperature steel for engineering machinery and production method thereof
CN110699598A (en) Niobium microalloyed high-strength high-weather-resistance angle steel and production process thereof
CN109234637B (en) Korean SD600 disc screw steel and production method thereof
CN102828124A (en) Non-quenched/tempered heavy plate for low-temperature pressure vessel and production method thereof
CN104372249A (en) 960MPa high-strength twisted steel bar for prestressed structures and preparation method thereof
CN102560260A (en) Low cost, high strength and toughness X 70 pipeline steel coil plate and its production method
CN104233075A (en) Chromium-containing niobium microalloyed 400MPa-grade reinforcing bar steel and production method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20190412

RJ01 Rejection of invention patent application after publication