CN107574280A - A kind of preparation method of hot rolled ribbed bars - Google Patents

A kind of preparation method of hot rolled ribbed bars Download PDF

Info

Publication number
CN107574280A
CN107574280A CN201710730511.2A CN201710730511A CN107574280A CN 107574280 A CN107574280 A CN 107574280A CN 201710730511 A CN201710730511 A CN 201710730511A CN 107574280 A CN107574280 A CN 107574280A
Authority
CN
China
Prior art keywords
during
hot rolled
rolled ribbed
alloy
steel
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
CN201710730511.2A
Other languages
Chinese (zh)
Inventor
王栋
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.)
Shanxi Tongcai Industry and Trade Co Ltd
Original Assignee
Shanxi Tongcai Industry and Trade Co Ltd
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 Shanxi Tongcai Industry and Trade Co Ltd filed Critical Shanxi Tongcai Industry and Trade Co Ltd
Priority to CN201710730511.2A priority Critical patent/CN107574280A/en
Publication of CN107574280A publication Critical patent/CN107574280A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a kind of preparation method of hot rolled ribbed bars, belong to the production technical field of low-alloy steel.A kind of preparation method of hot rolled ribbed bars, step include:Desulfurizing iron, converter smelting, nitrogen flushing, continuous casting, square billet are heated, rolled, controlling cold, cold bed air cooling;High ferrochrome mineral aggregate is added during desulfurizing iron, in sintering feed, controls outbound molten iron S≤0.045%;During converter smelting, 1,620 1670 DEG C of tapping temperature is controlled, the 6min of time 3, alloy raw material is added during tapping and carries out deoxidation, control chromium amount of oxidation 35 47%, C:0.21‑0.25%、Si:0.40‑0.60%、P≤0.045%、S≤0.045%、Ceq≥0.38%、Mn:0.90‑1.00%、Cr:0.06 0.19%, surplus is Fe and impurity.The present invention utilizes molten iron residual elements, compensator alloy manganese element, drops low alloy-consumption.

Description

A kind of preparation method of hot rolled ribbed bars
Technical field
The invention belongs to the production technical field of low-alloy steel, in particular to a kind of preparation method of hot rolled ribbed bars.
Background technology
As the labyrinth such as rapid development, large public building, skyscraper of building industry is to the demand of reinforcing bar Measure increasing, the requirement more and more higher to reinforcing bar bearing capacity.
The traditional processing technology of the reinforcing bar of HRB400MPa ranks is the carbon manganese steel system of the mainly composition based on 20MnSi Composition designs, manganese and alloying with silicon are carried out using manganese systems and silicon series ferroalloys, vanadium micro-alloying is carried out with vanadium iron or VN alloy, Or Nb-microalloying is carried out using ferrocolumbium, its main component controls Mn constituent contents, and Si elements exist between 1.2-1.6% Between 0.40-0.60%, C element is between 0.17-0.25%, yield strength (Rel) >=400MPa, and tensile strength >= 550MPa, the contraction percentage of area (A) >=16%, but there are the following problems for this method:Silicomanganese and carbon content are higher, cost of alloy liter It is high;The higher welding performance of carbon equivalent is poor;Easily there is surrender unobvious and mixed crystal phenomenon.
Because reinforcing bar requires higher to alloy manganese content(More than 1.05%)Between 1.2-1.6%, steel grade manganese element mainly according to Completed by steelmaking alloy process, increase manganese using silicomangan, silicomangan cost is higher, and silicon need to be consumed by averagely increasing manganese 0.01% Manganese alloy 0.17kg/ ton steel, manganese content can reduce STEELMAKING PRODUCTION cost in reducing steel under the premise of steel performance after ensureing to roll, Therefore, it is the effective way for reducing cost to seek cheap element instead of common metal element.
The content of the invention
It is an object of the invention to provide a kind of preparation method of hot rolled ribbed bars.
The present invention is achieved by the following technical solutions:
A kind of preparation method of hot rolled ribbed bars, step include:Desulfurizing iron, converter smelting, nitrogen flushing, continuous casting, square billet heating, Roll, control cold, cold bed air cooling;
During wherein described desulfurizing iron, high ferrochrome mineral aggregate is added in sintering feed and carries out ironmaking production, Chromium in Ores element is in height Furnace reduction is that simple substance chromium enters molten iron, controls outbound molten steel sulfur content S≤0.045%;
During described converter smelting, it is 1620-1670 DEG C to control tapping temperature, and tap time 3-6min, adds alloy during tapping Raw material carries out deoxidation, and control chromium amount of oxidation is in 35-47%, C:0.21-0.25%、Si:0.40-0.60%、P≤0.045%、S ≤0.045%、Ceq≥0.38%、Mn:0.90-1.00%、Cr:0.06-0.19%, surplus are Fe and inevitable impurity.
Further, during described converter ironmaking, Cr is worked as:During 0.06-0.10%, Mn is controlled:0.97-1.00%;Work as Cr: During 0.10-0.14%, Mn is controlled:0.93-0.97%;Work as Cr:During 0.14-0.19%, Mn is controlled:0.90-0.93%.
Described reinforcing bar is HRB400E reinforcing bars, high line φ 10.
The present invention utilizes molten iron remnants chromiums, compensator alloy manganese element, drops low alloy-consumption.Manganese main function in steel Have:Improve the quenching degree of steel;Improve the intensity of low-carbon and middle carbon pearlitic steel;Improve the high-temperature instantaneous intensity of steel.Chromium is in steel Effect be:Improve the intensity and hardness of steel;Improve the high-temperature mechanical property of steel;Make steel that there is good corrosion resistance and antioxygen The property changed;Prevent graphitization;Improve quenching degree.For hot rolled ribbed bars, manganese and the element of chromium two are acted in steel with weight Part is closed, steel performance is influenceed in steel according to manganese, chromium, inventor, which sums up two kinds of elements, can improve the intensity of steel and hard Degree, improve the quenching degree of steel.Learnt according to carbon equivalent calculation formula Ceq=C+Mn/6+ (Cr+V+Mo)/5+ (Cu+Ni)/15 in steel Each element contributes carbon equivalent relation, and wherein Mn and Cr relation can be approximately Mn/6=Cr/5, that is, ensure certain carbon equivalent premise Under, Cr, which improves 0.05%, can reduce Mn0.06%.
In converter smelting process, chromium highest oxidation amount 47%, average 39%, average remnants 61%, Blowing Nitrogen Process after tapping Ensure that alloying component is full and uniform.Because manganese and iron form solid solution, the hardness and intensity of ferrite and austenite in steel are improved; It is again simultaneously carbide former, a part of iron atom is substituted into cementite;In addition, manganese is critical due to reducing in steel Transition temperature, play a part of refining pearlite, also play a part of improving pearlitic steel intensity indirectly;Manganese stable austenite The ability of tissue is only second to nickel, also strongly increases the quenching degree of steel.And chromium is solid-solution in matrix in steel, crystal grain thinning can The intensity of steel is dramatically increased, reduces critical cooling rate, improves quenching degree;And Cr forms carbide with C, Fe, steel can be improved Hardness and wearability.Analyzed according to Cr, Mn element effect contrast played in steel, inventor proposes to replace with residual chromium in steel Alloy manganese, steel-smelting alloy consumption on the one hand can be reduced, residual elements in molten iron is utilized effectively.
In order to verify the effect according to reinforcing bar made from the inventive method, tension test has been carried out respectively, test Rel, RM valuesContrast test, performance test result is as shown in table 1,
Composition corresponds to mechanical property after the corresponding mechanical property of table 1
Learnt by upper table comparative analysis, in steel after the rise of Cr contents, in the case of carbon equivalent is ensured, steel rolling process is not adjusted Whole, the appropriate alloy Mn contents that reduce do not make significant difference influence on mechanical property, can meet finished product mechanical property requirements.
The present invention utilizes molten iron residual elements, compensator alloy manganese element, drops low alloy-consumption.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to Limit the present invention.
Embodiment 1
A kind of preparation method of hot rolled ribbed bars, wherein reinforcing bar are HRB400E reinforcing bars, and high line φ 10, step includes:
(1)Desulfurizing iron:High ferrochrome mineral aggregate is added in sintering feed and carries out ironmaking production, Chromium in Ores element is reduced in blast furnace Simple substance chromium enters molten iron, controls outbound molten steel sulfur content S≤0.045%;
(2)Converter smelting:It is 1620-1670 DEG C to control tapping temperature, and tap time 3-6min, and addition alloy raw material enters during tapping Row deoxidation, control chromium amount of oxidation is in 35-47%, C:0.21-0.25%、Si:0.40-0.60%、P≤0.045%、S≤ 0.045%th, Ceq >=0.38%, work as Cr:During 0.06-0.10%, Mn is controlled:0.97-1.00%;Surplus be Fe and inevitably it is miscellaneous Matter;
(3)Then conventionally progress nitrogen flushing, continuous casting, square billet are heated, rolled, controlling cold, cold bed air cooling.
Embodiment 2
A kind of preparation method of hot rolled ribbed bars, wherein reinforcing bar are HRB400E reinforcing bars, and high line φ 10, step includes:
(1)Desulfurizing iron:High ferrochrome mineral aggregate is added in sintering feed and carries out ironmaking production, Chromium in Ores element is reduced in blast furnace Simple substance chromium enters molten iron, controls outbound molten steel sulfur content S≤0.045%;
(2)Converter smelting:It is 1620-1670 DEG C to control tapping temperature, and tap time 3-6min, and addition alloy raw material enters during tapping Row deoxidation, control chromium amount of oxidation is in 35-47%, C:0.21-0.25%、Si:0.40-0.60%、P≤0.045%、S≤ 0.045%th, Ceq >=0.38%, work as Cr:During 0.10-0.14%, Mn is controlled:0.93-0.97%;Surplus be Fe and inevitably it is miscellaneous Matter;
(3)Then conventionally progress nitrogen flushing, continuous casting, square billet are heated, rolled, controlling cold, cold bed air cooling.
Embodiment 3
A kind of preparation method of hot rolled ribbed bars, wherein reinforcing bar are HRB400E reinforcing bars, and high line φ 10, step includes:
(1)Desulfurizing iron:High ferrochrome mineral aggregate is added in sintering feed and carries out ironmaking production, Chromium in Ores element is reduced in blast furnace Simple substance chromium enters molten iron, controls outbound molten steel sulfur content S≤0.045%;
(2)Converter smelting:It is 1620-1670 DEG C to control tapping temperature, and tap time 3-6min, and addition alloy raw material enters during tapping Row deoxidation, control chromium amount of oxidation is in 35-47%, C:0.21-0.25%、Si:0.40-0.60%、P≤0.045%、S≤ 0.045%th, Ceq >=0.38%, work as Cr:During 0.14-0.19%, Mn is controlled:0.90-0.93%;Surplus be Fe and inevitably it is miscellaneous Matter;
(3)Then conventionally progress nitrogen flushing, continuous casting, square billet are heated, rolled, controlling cold, cold bed air cooling.

Claims (3)

1. a kind of preparation method of hot rolled ribbed bars, step include:Desulfurizing iron, converter smelting, nitrogen flushing, continuous casting, square billet add Heat, roll, control cold, cold bed air cooling, it is characterised in that:
During described desulfurizing iron, high ferrochrome mineral aggregate is added in sintering feed and carries out ironmaking production, Chromium in Ores element is in blast furnace It is reduced to simple substance chromium and enters molten iron, controls outbound molten steel sulfur content S≤0.045%;
During described converter smelting, it is 1620-1670 DEG C to control tapping temperature, and tap time 3-6min, adds alloy during tapping Raw material carries out deoxidation, and control chromium amount of oxidation is in 35-47%, C:0.21-0.25%、Si:0.40-0.60%、P≤0.045%、S ≤0.045%、Ceq≥0.38%、Mn:0.90-1.00%、Cr:0.06-0.19%, surplus are Fe and inevitable impurity.
A kind of 2. preparation method of hot rolled ribbed bars according to claim 1, it is characterised in that described converter ironmaking When, work as Cr:During 0.06-0.10%, Mn is controlled:0.97-1.00%;Work as Cr:During 0.10-0.14%, Mn is controlled:0.93-0.97%;When Cr:During 0.14-0.19%, Mn is controlled:0.90-0.93%.
A kind of 3. preparation method of hot rolled ribbed bars according to claim 1 or 2, it is characterised in that described reinforcing bar For HRB400E reinforcing bars.
CN201710730511.2A 2017-08-23 2017-08-23 A kind of preparation method of hot rolled ribbed bars Pending CN107574280A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710730511.2A CN107574280A (en) 2017-08-23 2017-08-23 A kind of preparation method of hot rolled ribbed bars

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710730511.2A CN107574280A (en) 2017-08-23 2017-08-23 A kind of preparation method of hot rolled ribbed bars

Publications (1)

Publication Number Publication Date
CN107574280A true CN107574280A (en) 2018-01-12

Family

ID=61035948

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710730511.2A Pending CN107574280A (en) 2017-08-23 2017-08-23 A kind of preparation method of hot rolled ribbed bars

Country Status (1)

Country Link
CN (1) CN107574280A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109182649A (en) * 2018-09-06 2019-01-11 山西通才工贸有限公司 A kind of low-alloy steel method of deoxidation
CN110684931A (en) * 2019-10-24 2020-01-14 柳州钢铁股份有限公司 Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar
CN110819907A (en) * 2019-10-24 2020-02-21 柳州钢铁股份有限公司 Niobium microalloyed HRB400E hot-rolled ribbed steel bar
CN113637916A (en) * 2021-08-19 2021-11-12 山西通才工贸有限公司 Ultrahigh-strength hot-rolled anchor rod steel bar and production method thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102321849A (en) * 2011-09-05 2012-01-18 广西盛隆冶金有限公司 Preparation method of nickel-chrome alloy steel
CN102732787A (en) * 2012-07-20 2012-10-17 江苏省沙钢钢铁研究院有限公司 600MPa level quake-proof twisted steel and manufacturing method thereof
CN102383039B (en) * 2011-11-10 2013-07-17 长沙东鑫环保材料有限责任公司 Microalloy HRB500E steel bar containing chrome and nitrogen and production method thereof
CN103667922A (en) * 2013-11-18 2014-03-26 首钢水城钢铁(集团)有限责任公司 Method of producing high-strength HRB400 hot-rolled ribbed bars
CN104233096A (en) * 2014-09-20 2014-12-24 唐山市德龙钢铁有限公司 Method used for producing 400 MPa level hot rolled ribbed steel bar and capable of reducing alloy cost
CN104745940A (en) * 2015-04-03 2015-07-01 甘肃酒钢集团宏兴钢铁股份有限公司 Rust-resistant hot rolled ribbed bar and production process thereof
CN104911498A (en) * 2015-06-26 2015-09-16 武汉钢铁(集团)公司 Atmospheric-corrosion-resistant steel bar and production method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102321849A (en) * 2011-09-05 2012-01-18 广西盛隆冶金有限公司 Preparation method of nickel-chrome alloy steel
CN102383039B (en) * 2011-11-10 2013-07-17 长沙东鑫环保材料有限责任公司 Microalloy HRB500E steel bar containing chrome and nitrogen and production method thereof
CN102732787A (en) * 2012-07-20 2012-10-17 江苏省沙钢钢铁研究院有限公司 600MPa level quake-proof twisted steel and manufacturing method thereof
CN103667922A (en) * 2013-11-18 2014-03-26 首钢水城钢铁(集团)有限责任公司 Method of producing high-strength HRB400 hot-rolled ribbed bars
CN104233096A (en) * 2014-09-20 2014-12-24 唐山市德龙钢铁有限公司 Method used for producing 400 MPa level hot rolled ribbed steel bar and capable of reducing alloy cost
CN104745940A (en) * 2015-04-03 2015-07-01 甘肃酒钢集团宏兴钢铁股份有限公司 Rust-resistant hot rolled ribbed bar and production process thereof
CN104911498A (en) * 2015-06-26 2015-09-16 武汉钢铁(集团)公司 Atmospheric-corrosion-resistant steel bar and production method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109182649A (en) * 2018-09-06 2019-01-11 山西通才工贸有限公司 A kind of low-alloy steel method of deoxidation
CN110684931A (en) * 2019-10-24 2020-01-14 柳州钢铁股份有限公司 Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar
CN110819907A (en) * 2019-10-24 2020-02-21 柳州钢铁股份有限公司 Niobium microalloyed HRB400E hot-rolled ribbed steel bar
CN110819907B (en) * 2019-10-24 2020-11-27 柳州钢铁股份有限公司 Niobium microalloyed HRB400E hot-rolled ribbed steel bar
CN110684931B (en) * 2019-10-24 2020-11-27 柳州钢铁股份有限公司 Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar
CN113637916A (en) * 2021-08-19 2021-11-12 山西通才工贸有限公司 Ultrahigh-strength hot-rolled anchor rod steel bar and production method thereof

Similar Documents

Publication Publication Date Title
CN100412223C (en) Ultra-high strength steel with excellent corrosion resistance and fatigue resistance and its making process
CN107557678B (en) Inexpensive 550MPa grades of hot rolling container weathering steel and its manufacturing method
CN107574280A (en) A kind of preparation method of hot rolled ribbed bars
CN101153371B (en) High-strength cold-formed hot continuous rolled steel plate and method of preparing the same
CN101235469A (en) High-strength easy-formation atmospheric corrosion resisting steel
CN102618792A (en) High-strength abrasion-resistant steel for engineering machinery and manufacturing method thereof
CN102839321A (en) Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof
CN101338400B (en) High strength low-temperature-used low carbon bainite steel and production process thereof
CN103981446B (en) A kind of bainite type 700MPa level Twisted Steel and production method thereof
CN102703813A (en) Vanadium and titanium compound microalloyed steel bar and production method thereof
CN101781735B (en) Economical high-strength binding strip steel with tensile strength more than or equal to 1,000 MPa, and manufacturing method thereof
CN109957712A (en) A kind of soft X70M line steel hot rolling coiled sheet and its manufacturing method
CN101805870B (en) High strength strapping steel with tensile strength over 1,100 MPa and manufacturing method thereof
CN111748741A (en) Thick pipeline steel and low compression ratio production process thereof
CN110284066B (en) Thin-gauge low-yield-ratio pipeline steel and manufacturing method thereof
CN106555117A (en) A kind of uniform high strength flat-bulb steel of section performance and its production technology
CN101619419B (en) Steel plate for low-carbon high-niobium high strength welding structure and method for manufacturing same
CN102409233A (en) Low-temperature steel for engineering machinery and production method thereof
CN110684925A (en) High-strength wear-resistant corrosion-resistant hot-rolled steel strip and production method thereof
CN104451436A (en) Bainite-martensite-austenite multi-phase wear-resistant steel plate and manufacturing method thereof
CN104451446B (en) Thick-gauge, high-strength and high-toughness bainite engineering steel and production method thereof
CN101956135B (en) Medium carbon alloy high-strength quenched and tempered steel plate and production method thereof
CN104561792B (en) A kind of V-N alloying high strength steel plate and manufacture method
CN104233096A (en) Method used for producing 400 MPa level hot rolled ribbed steel bar and capable of reducing alloy cost
CN105543680B (en) Micro- boron processing tensile strength 700MPa levels Wide and Thick Slab and manufacture method

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
RJ01 Rejection of invention patent application after publication

Application publication date: 20180112