CN104831193A - Production method for fine grain steel bar - Google Patents

Production method for fine grain steel bar Download PDF

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Publication number
CN104831193A
CN104831193A CN201510200095.6A CN201510200095A CN104831193A CN 104831193 A CN104831193 A CN 104831193A CN 201510200095 A CN201510200095 A CN 201510200095A CN 104831193 A CN104831193 A CN 104831193A
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China
Prior art keywords
temperature
production
converter
add
composition
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Pending
Application number
CN201510200095.6A
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Chinese (zh)
Inventor
吕刚
戈春刚
谭晓东
王兆元
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.)
Baotou Iron and Steel Group Co Ltd
Inner Mongolia Baotou Steel Union Co Ltd
Original Assignee
Baotou Iron and Steel Group Co Ltd
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Filing date
Publication date
Application filed by Baotou Iron and Steel Group Co Ltd filed Critical Baotou Iron and Steel Group Co Ltd
Priority to CN201510200095.6A priority Critical patent/CN104831193A/en
Publication of CN104831193A publication Critical patent/CN104831193A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a production method for fine grain steel bar, in particular to a production method for fine grain HRB400 steel bar. The method is characterized by: designing the following components by mass percentage: 0.19-0.25 of C, 0.55-0.80 of Si, 1.45-1.60 of Mn, 0.20-0.30 of Cr, less than or equal to 0.045 of P, less than or equal to 0.045 of S and the balance iron; and employing the process route of converter smelting, LF ladle furnace refining, billet continuous casting and high speed wire rolling. By changing the material composition and adjusting the technological parameters, the method provided by the invention reduces the production cost of HRB400 threaded steel bar, refines the material grain, and stabilizes the product performance.

Description

A kind of production method of close grain reinforcing bar
Technical field
The present invention relates to a kind of production method of close grain reinforcing bar, particularly a kind of production method of close grain HRB400 reinforcing bar, belong to metallurgical and metal material field.
Background technology
HRB400 is the Twisted Steel trade mark of regulation in " concrete reinforcement steel " GB 1499.2-2007, because of the difference such as production unit, technology controlling and process of standard analysis a wider range and manufacturer, the composition of the HRB400 hot rolled ribbed steel bar that each producer produces is different, simultaneously each steel mill's production technique is also different, has to improve reinforced steel bar strength by cooling refined crystalline strengthening fast, having and improving the methods such as reinforced steel bar strength by microalloying.
The GB chemical composition of HRB400 steel is in table 1.
Table 1 chemical composition (mass percent)
The trade mark C Si Mn P S Cr
GB 1499.2—2007 ≤0.25 ≤0.80 ≤1.60 ≤0.045 ≤0.045 ——
Part steel mill is because of Composition Design and technology controlling and process is unreasonable or do not mate, and cause and there is performance inconsistency when large-scale commercial production, part quality in kind does not meet standard-required.
Summary of the invention
The present invention is the production method of close grain reinforcing bar that object is to provide a kind of stable performance, low cost.
Concrete solution of the present invention is as follows:
Composition Design: by mass percent C0.19-0.25, Si0.55-0.80, Mn1.45-1.60, Cr 0.20-0.30, P≤0.045, S≤0.045, surplus is iron, and each component sum is 100%.
C, Si, Mn in 20MnSi steel is adjusted to the middle upper limit by the present invention, adds cheap Cr in addition and replaces V, compensate for the undercapacity of steel, reach the object reduced costs in steel.In steel, add Cr is the solution strengthening effect utilized in steel, improves the intensity of steel.In addition, utilize the hardening capacity effect improving steel, refinement rebar surface crystal grain improves the intensity of steel.Cr also can form nitride with the free N in steel, can eliminate the ageing behavior that N brings.
Adopt the operational path of converter smelting-LF ladle furnace refining-continuous small-billet casting-high speed wire rolling.
Be specially:
1, converter producing
The carbon content of converter terminal molten steel, phosphorus content and tapping temperature are as follows: carbon content C>=0.06 wt%, P≤0.030 wt%, tapping temperature 1620-1644 DEG C;
Add ferrosilicon, silicomanganese, hard coal and aluminium silicon titanium deoxidation alloying according to component requirements, tapping process ladle carries out BOTTOM ARGON BLOWING operation, adopts atm number to stir during Argon;
2, LF stove is produced
Add lime, fluorite and bauxitic clay according to converter molten steel composition, calcium carbide add-on controls at 50-100 kg; Trimming is carried out according to converter molten steel alloying element content determination ferrosilicon, mid-carbon fe-mn, the anthracitic add-on of calcination, the refining later stage adds ferrochrome, the soft blow time is greater than 10min, to ensure homogeneity and the inclusion floating of chemical composition, and upper casting machine after feeding silicon-calcium wire after refining;
3, continuous casting is produced
Superheating temperature controls at 30 ± 5 DEG C, and casting speed control is within 2.2 ~ 2.6m/min scope;
4, Rolling production
The highest roll speed 25 ~ 77m/s, rolling temperature: open rolling 980 ± 30 DEG C, entry temperature at finishing 950 ± 10 DEG C, laying temperature 890 ~ 990 DEG C, stelmo line roller table speed sets: roller-way entrance 0.46 ~ 0.59 m/s, Z1 0.52 ~ 0.65m/s, Z2 0.58 ~ 0.71 m/s, Z3 0.64 ~ 0.78 m/s, Z4 0.71 ~ 0.82 m/s, Z5 0.76 ~ 0.86 m/s, Z6 0.70 ~ 0.86 m/s, Z7 0.62 ~ 0.77 m/s, Z8 0.56 ~ 0.73 m/s, roller-way outlet 0.49 ~ 0.66 m/s.
Advantage of the present invention is: by changing the composition of material and adjusting process parameter, reduces the production cost of HRB400 Twisted Steel, the refinement crystal grain of material, stabilizes product performance.
Embodiment
Commerical test production technique is summarized as follows:
Converter smelting-LF ladle furnace refining-continuous small-billet casting
THE INDUSTRIAL TRIAL 10 stove steel, concrete process parameter control is as follows:
1) converter producing
Add lime 5000 ~ 6000kg according to practical situation during converter smelting, rhombspar 3000 ~ 4000kg, iron sheet ball 1000 ~ 3000kg, adds ferrosilicon 500kg in tapping process, silicomanganese 2800kg.
The carbon content of converter terminal molten steel, phosphorus content (mass percent) and tapping temperature are as shown in table 2.
The composition of table 2 converter tapping and temperature
Tapping temperature, DEG C Tapping carbon content, wt% Tapping phosphorus content, wt%
Minimum value 1620 0.06 0.011
Maximum value 1644 0.15 0.030
Mean value 1633 0.11 0.020
2) LF stove is produced
The refining of LF stove is carried out adding auxiliary material slag making according to molten steel composition and temperature variation, adds alloy and carries out finely tuning and warming temperature.Add lime 500-600kg, bauxitic clay 200-300kg, alloy carries out fine setting according to refining composition in place and adds ferromanganese 50-80kg, ferrosilicon 100-300 kg, and Cr iron 250-280kg, feeds silicon-calcium wire after refining, feed quantity 200-300m.
3) continuous casting is produced
Superheating temperature controls at 27 ~ 34 DEG C, and pulling rate is between 2.2 ~ 2.6m/min.The composition (mass percent) of molten steel controls as shown in table 3.
Table 3 finished product composition ( wt %)
C Si Mn Cr P S
Minimum value 0.21 0.57 1.46 0.21 0.012 0.011
Maximum value 0.25 0.65 1.55 0.25 0.030 0.022
Mean value 0.23 0.61 1.50 0.23 0.024 0.018
4) Rolling production
In production, Φ 8mm, Φ 10mm, Φ 12mm, Φ 14mm reinforcing bar start rolling temperature are all between 970 DEG C ~ 1000 DEG C, and entry temperature at finishing is between 940 DEG C ~ 960 DEG C, and Stelmor cooling line stay-warm case is all opened.Φ 8mm reinforcing bar laying temperature 970 DEG C ~ 990 DEG C, 50% air quantity opened by front 6 framves of blower fan, Φ 10mm reinforcing bar laying temperature 940 DEG C ~ 960 DEG C, 80% air quantity opened by front 6 framves of blower fan, Φ 12mm reinforcing bar laying temperature 920 DEG C ~ 940 DEG C, 100% air quantity opened by front 7 framves of blower fan, Φ 14mm reinforcing bar laying temperature 890 DEG C ~ 910 DEG C, and 100% air quantity opened by front 7 framves of blower fan.
[0016] specifically in table 4
The cooling control technology parameter of table 4 HRB400 reinforcing bar
Product mechanical property is in table 5
Table 5 mechanical property cartogram
Large-scale commercial production result shows the control by production links such as chemical composition design and converter, LF refining, continuous casting, steel rolling, produce screw wire rod quality product and indices all meets standard-required, meet user's user demand.

Claims (1)

1. a production method for close grain reinforcing bar, is characterized in that: Composition Design: by mass percent C0.19-0.25, Si0.55-0.80, Mn1.45-1.60, Cr 0.20-0.30, P≤0.045, S≤0.045, and surplus is iron, and each component sum is 100%; Processing step is as follows:
1) converter producing
The carbon content of converter terminal molten steel, phosphorus content and tapping temperature are as follows: carbon content C>=0.06 wt%, P≤0.030 wt%, tapping temperature 1620-1644 DEG C;
Add ferrosilicon, silicomanganese, hard coal and aluminium silicon titanium deoxidation alloying according to component requirements, tapping process ladle carries out BOTTOM ARGON BLOWING operation, adopts atm number to stir during Argon;
2) LF stove is produced
Add lime, fluorite and bauxitic clay according to converter molten steel composition, calcium carbide add-on controls at 50-100 kg; Trimming is carried out according to converter molten steel alloying element content determination ferrosilicon, mid-carbon fe-mn, the anthracitic add-on of calcination, the refining later stage adds ferrochrome, the soft blow time is greater than 10min, to ensure homogeneity and the inclusion floating of chemical composition, and upper casting machine after feeding silicon-calcium wire after refining;
3) continuous casting is produced
Superheating temperature controls at 30 ± 5 DEG C, and casting speed control is within 2.2 ~ 2.6m/min scope;
4) Rolling production
The highest roll speed 25 ~ 77m/s, rolling temperature: open rolling 980 ± 30 DEG C, entry temperature at finishing 950 ± 10 DEG C, laying temperature 890 ~ 990 DEG C, stelmo line roller table speed sets: roller-way entrance 0.46 ~ 0.59 m/s, Z1 0.52 ~ 0.65m/s, Z2 0.58 ~ 0.71 m/s, Z3 0.64 ~ 0.78 m/s, Z4 0.71 ~ 0.82 m/s, Z5 0.76 ~ 0.86 m/s, Z6 0.70 ~ 0.86 m/s, Z7 0.62 ~ 0.77 m/s, Z8 0.56 ~ 0.73 m/s, roller-way outlet 0.49 ~ 0.66 m/s.
CN201510200095.6A 2015-04-26 2015-04-26 Production method for fine grain steel bar Pending CN104831193A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201510200095.6A CN104831193A (en) 2015-04-26 2015-04-26 Production method for fine grain steel bar

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CN104831193A true CN104831193A (en) 2015-08-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105779866A (en) * 2016-05-31 2016-07-20 内蒙古包钢钢联股份有限公司 HRB400 rebar and production method thereof
CN106319179A (en) * 2016-08-31 2017-01-11 云南德胜钢铁有限公司 Production technology for HRB400 coiled fine-grain reinforcing steel bar
CN108300938A (en) * 2018-01-19 2018-07-20 天津荣程联合钢铁集团有限公司 A kind of rolled wire steel and its processing method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102500960A (en) * 2011-12-09 2012-06-20 内蒙古包钢钢联股份有限公司 Production method of low-carbon welding wire steel
CN103205628A (en) * 2013-04-26 2013-07-17 内蒙古包钢钢联股份有限公司 Production method of HRB400 (Rockwell Hardness) deformed steel bar
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102500960A (en) * 2011-12-09 2012-06-20 内蒙古包钢钢联股份有限公司 Production method of low-carbon welding wire steel
CN103205628A (en) * 2013-04-26 2013-07-17 内蒙古包钢钢联股份有限公司 Production method of HRB400 (Rockwell Hardness) deformed steel bar
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105779866A (en) * 2016-05-31 2016-07-20 内蒙古包钢钢联股份有限公司 HRB400 rebar and production method thereof
CN106319179A (en) * 2016-08-31 2017-01-11 云南德胜钢铁有限公司 Production technology for HRB400 coiled fine-grain reinforcing steel bar
CN108300938A (en) * 2018-01-19 2018-07-20 天津荣程联合钢铁集团有限公司 A kind of rolled wire steel and its processing method

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Application publication date: 20150812