CN103160738B - Low-cost boron-containing steel and manufacturing method thereof - Google Patents
Low-cost boron-containing steel and manufacturing method thereof Download PDFInfo
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- CN103160738B CN103160738B CN201110417373.5A CN201110417373A CN103160738B CN 103160738 B CN103160738 B CN 103160738B CN 201110417373 A CN201110417373 A CN 201110417373A CN 103160738 B CN103160738 B CN 103160738B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 36
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 11
- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 238000007670 refining Methods 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 12
- 238000005275 alloying Methods 0.000 claims description 8
- 239000004411 aluminium Substances 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000006104 solid solution Substances 0.000 abstract description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 abstract 1
- 238000009826 distribution Methods 0.000 abstract 1
- 239000010936 titanium Substances 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a low-cost boron-containing steel and a manufacturing method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.05 to 0.08 percent of C, 0.10 to 0.25 percent of Si, 1.60 to 1.80 percent of Mn1, 0.03 to 0.045 percent of Als, 0.030 to 0.045 percent of Ti0.003 to 0.009 percent of B, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.0015 percent of O, less than or equal to 0.0025 percent of N, and the balance of Fe and inevitable impurities. In the later stage of LF refining, the content of O, N in steel is controlled by adding aluminum for deoxidation and adding ferrotitanium for nitrogen fixation, and ferroboron is added finally, so that the yield of boron and the uniformity of boron distribution in steel are ensured. Heating temperature is 1150 +/-30 ℃, and heating time is 90-120 min; the initial rolling temperature of hot rolling is 1120 +/-30 ℃, and the final rolling temperature is 820 +/-30 ℃; starting to cool at 780 +/-30 ℃; the final cooling temperature is (500-540) +/-30 ℃. According to the invention, the content of solid solution boron in the steel is ensured and the strengthening effect of boron is improved by controlling the boron in the steel not to be combined with oxygen and nitrogen. By changing the adding amount of boron and adjusting the heating, hot rolling and cooling temperatures, the low-cost boron-containing steel with the strength grades of 460MPa, 500MPa and 550MPa can be obtained.
Description
Technical field
The invention belongs to metallurgical technology field, be related specifically to a kind of low cost boron-containing steel and manufacture method thereof.
Background technology
B is as the alloying element added in steel, the discovery of its beneficial effect is long-standing, B as added 0.001% ~ 0.002% in steel just can significantly improve the hardening capacity of steel, and what increase steel can through hardening size, improves the homogeneity of steel product cross-sectional inner tissue and performance after quenching; B is also used to the mechanical behavior under high temperature improving some steel, as high temperature creep property and creep rupture strength.As far back as earlier 1900s, just start the trial adding micro-B in steel abroad.Domestic containing backwardness relatively in the development of B steel, in the eighties in last century, domesticly just start the influence research work of B to steel grade performance, as congratulatory letter Lay etc. was once studied the mechanism of action improving austenitic steel hardening capacity B element, think segregation in the composition of the effect of austenite grain boundary B and body material and foreign matter content closely related.Although both at home and abroad investigator has carried out the influence research work of B for many years to structure of steel and performance, but produce High-Strength Low-Alloy boron-containing steel at present and still need in steel, add other microalloy element a large amount of.
" a kind of obdurability mates good extra-thick quenched and tempered steel plate and manufacture method thereof " (publication number CN101660100) invents a kind of obdurability related to and mates good extra-thick quenched and tempered steel plate and manufacturing process thereof, based on the component system adopting low C-Mn-(Ti+V+B) micro-alloyed steel, carry out (Cu+Ni+Mo+Cr) alloying, obtain evenly excellent obdurability, strong plasticity coupling.Described Ingredient percent is: C0.07% ~ 0.11%; Si≤0.20%; Mn0.95% ~ 1.45%; P≤0.013%; S≤0.003%; Cr0.15% ~ 0.45%; Cu0.1% ~ 0.35%; Ni0.20% ~ 0.50%; Mo0.15% ~ 0.45%; Als0.04% ~ 0.06%, Ti0.006% ~ 0.011%; V0.02% ~ 0.06%; N≤0.0070%; B0.0007% ~ 0.0014%; All the other are Fe and inevitable impurity.
" steel plate of obdurability, strong plasticity and manufacture method thereof " (publication number CN101565800) invention provides a kind of HT780 steel plate and manufacture method thereof.This HT780 steel plate comprises (weight percent) C:0.050% ~ 0.090%, Si :≤0.15%, Mn:1.00% ~ 1.50%, P :≤0.013%, S :≤0.003%, Cr:0.40% ~ 0.80%, Cu:0.25% ~ 0.55%, Ni:0.40% ~ 0.90%, Mo:0.25% ~ 0.55%, Als:0.04% ~ 0.06%, Ti:0.005% ~ 0.011%, V:0.015% ~ 0.045%, N :≤0.004%, Ca:0.001% ~ 0.005%, B:0.0006% ~ 0.0013%, all the other are iron and inevitable inclusion.
From contrasting above, current B adds in steel mainly as raising hardening capacity element, and by strengthening matrix with other microalloy element interaction such as Cu, Ni, Cr, Mo, V.In addition, in prior art, clear and definite restriction is not had to O, N content in steel, or limited field is wider, O, N in steel can be made like this to be combined with B element, affect B to the contribution improving intensity.
Summary of the invention
The invention provides that a kind of composition is simple, technique low cost boron-containing steel and manufacture method thereof flexibly, in the chemical composition design of steel, cancel adding of the elements such as V, Mo, Cr, Ni, Cu, reduce production cost.By adding aluminium deoxidation in the LF refining later stage, adding ferrotianium fixed nitrogen, control O, N content in steel, finally add ferro-boron, the homogeneity that the recovery rate of guarantee boron and boron distribute in steel.The invention provides and obtain by adjustment heating, hot rolling, cooling system the manufacture method that intensity rank is 460MPa, 500MPa, 550MPa low cost boron-containing steel.
Further, in invention, the chemical composition of involved steel is, C0.05% ~ 0.08%, Si0.10% ~ 0.25%, Mn1.60% ~ 1.80%, Als0.03% ~ 0.045%, Ti0.030% ~ 0.045%, B0.003% ~ 0.009%, P≤0.025%, S≤0.015%, O≤0.0015%, N≤0.0025%, all the other are Fe and inevitable impurity.The present invention is based on following reason selects alloying element kind and content: C thereof to be the key elements affecting steel mechanics performance, and the carbon content scope that the present invention determines is 0.05% ~ 0.08%, and object reduces carbon equivalent, improves the over-all properties of steel.Si is the bioelement of deoxidation in steel making, has the effect of certain solution strengthening, and can suppress one-step temper embrittlement, improves martenaging martempering stability, and improve tempering temperature, Si content range of the present invention is 0.10% ~ 0.25%.Mn improves the intensity of steel and the cheap element of hardening capacity, and the content of Mn of the present invention is 1.60% ~ 1.80%.Al: aluminium is deoxidant element, in order to reach good deoxidation effect, ensureing that steel oxygen in water is less than 15ppm, guaranteeing not generate B in fusion process
2o
3, Als content range of the present invention is 0.03% ~ 0.045%.Ti: the Main Function adding titanium is the N in fixing steel, and titanium content is 0.030% ~ 0.045%.B: the effect that the present invention adds B utilizes B element to improve the intensity of steel in the segregation of crystal boundary, B content range 0.003% ~ 0.009%.Impurity element P≤0.025% in steel of the present invention, S≤0.015%, to reduce the deleterious effect of impurity element.Control O≤0.0015% in steel of the present invention, N≤0.0025%, object ensures that boron is not combined with oxygen and nitrogen and affects it to the contribution improving intensity.
The manufacture method of low cost boron-containing steel involved in the present invention is made up of following steps: melting → Alloying Treatment → continuous casting → heating → rolling → cooling.Principal feature is:
1, Alloying Treatment.Add the chemical composition of aluminium and ferrotianium adjustment steel in the LF refining later stage, finally add ferro-boron.
2, heating steel billet.Heating temperature 1150 ± 30 DEG C, heat-up time 90 ~ 120min.
3, hot rolling.Start rolling temperature 1120 ± 30 DEG C, finishing temperature 820 ± 30 DEG C.
4, cool.Begin to cool down temperature 780 ± 30 DEG C; Stop cooling temperature (500 ~ 540) ± 30 DEG C.
Heating involved in the present invention, hot rolling technology adjust within bound scope by the strength levels necessitate of steel plate, and when producing 460MPa rank boron-containing steel, B content 0.003% ~ 0.0049% in steel, stops cooling temperature 540 ± 30 DEG C.When producing 500MPa rank boron-containing steel, B content 0.005% ~ 0.0069% in steel, stops cooling temperature 520 ± 30 DEG C.When producing 550MPa rank boron-containing steel, B content 0.007% ~ 0.009% in steel, stops cooling temperature 500 ± 30 DEG C.
Further, aforementioned involved low cost boron-containing steel metallographic structure is based on ferrite bainite and upper bainite, and in tissue, original austenite grain boundary is obvious.
The boron-containing steel produced by such scheme has following beneficial effect:
1, chemical composition design is simple, and eliminate adding of the elements such as V, Mo, Cr, Ni, Cu, production cost is low.
2, manufacturing process is flexible, by adding aluminium and ferrotianium in the LF refining later stage, can finally add the alloying processing method of ferro-boron to control O, the N content in steel.By controlling the adjustment of B element add-on and heating, hot rolling, cooling temperature, obtain the boron-containing steel that intensity rank is 460MPa, 500MPa, 550MPa.
It is complicated that chemical composition design involved in the present invention and manufacture method solve the boron-containing steel chemical composition design that exists in prior art, and production cost is high, and O in steel, N content is too high and affect B to the problem improving intensity contribution.Not being combined with oxygen and nitrogen by controlling boron in steel, ensureing content of boron in solid solution in steel, improving the strengthening effect of B element.
Embodiment
Chemical composition of the present invention is as table 1, and actual process parameter of the present invention is as table 2, and mechanical property in kind of the present invention is as table 3.
Table 1 chemical composition, Wt%
Table 2 actual process parameter
Table 3 mechanical property in kind
Claims (3)
1. the manufacture method of a low cost boron-containing steel, it is characterized in that the weight percent of the chemical composition of steel is: C0.05% ~ 0.08%, Si0.10% ~ 0.25%, Mn1.60% ~ 1.80%, Als0.03% ~ 0.045%, Ti0.032% ~ 0.045%, B0.0052% ~ 0.009%, P≤0.025%, S≤0.015%, O≤0.0015%, N≤0.0025%, all the other are Fe and inevitable impurity; Manufacture method comprises melting → Alloying Treatment → continuous casting → heating → rolling → cooling, is specially:
1) Alloying Treatment: the chemical composition adding aluminium and ferrotianium adjustment steel in the LF refining later stage, finally adds ferro-boron;
2) heating steel billet: Heating temperature 1150 ± 30 DEG C, heat-up time 90 ~ 120min;
3) hot rolling: start rolling temperature 1120 ± 30 DEG C, finishing temperature 790 ~ 819 DEG C;
4) cool: begin to cool down temperature 780 ± 30 DEG C; Stop cooling temperature (500 ~ 540) ± 30 DEG C.
2. the manufacture method of a kind of low cost boron-containing steel according to claim 1, is characterized in that: B content 0.0052% ~ 0.0069% in steel, stops cooling temperature 520 ± 30 DEG C.
3. the manufacture method of a kind of low cost boron-containing steel according to claim 1, is characterized in that: B content 0.007% ~ 0.009% in steel, stops cooling temperature 500 ± 30 DEG C.
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| CN201110417373.5A CN103160738B (en) | 2011-12-14 | 2011-12-14 | Low-cost boron-containing steel and manufacturing method thereof |
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| CN103160738B true CN103160738B (en) | 2015-09-02 |
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| CN105296866B (en) * | 2014-06-09 | 2017-09-26 | 鞍钢股份有限公司 | Steel for blade, production method and blade treatment method |
| CN105220073B (en) * | 2014-06-09 | 2017-09-15 | 鞍钢股份有限公司 | Hot-rolled strip steel for rake blades, production method and rake blade treatment method |
| CN105274281A (en) * | 2014-06-23 | 2016-01-27 | 鞍钢股份有限公司 | Method for accurately controlling boron content in steel |
| CN104313468A (en) * | 2014-11-14 | 2015-01-28 | 武汉钢铁(集团)公司 | Steel plate for 460MPa grade low-alloy high-strength structure and production method of steel plate |
| CN106624465B (en) * | 2016-12-08 | 2019-07-26 | 河海大学常州校区 | A kind of hardfacing electrode and preparation method thereof |
| CN106756440B (en) * | 2017-03-15 | 2018-05-18 | 常熟理工学院 | A kind of smelting process of accurate control boron-containing alloy steel Boron contents |
| CN109234607B (en) * | 2018-10-26 | 2020-11-10 | 山东钢铁集团日照有限公司 | Wide slab production method for increasing acid-soluble boron content |
| CN111254366A (en) * | 2020-03-19 | 2020-06-09 | 本钢板材股份有限公司 | Production method of steel for hot-rolled boron-containing steel pipe |
| CN112981240B (en) * | 2021-01-29 | 2022-11-04 | 邯郸钢铁集团有限责任公司 | Q550MD low-alloy high-strength steel plate and production method thereof |
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