CN103741025B - A kind of is add the method that boron agent prepares Boron Bearing Microalloy Steel with pig iron containing boron - Google Patents
A kind of is add the method that boron agent prepares Boron Bearing Microalloy Steel with pig iron containing boron Download PDFInfo
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Abstract
A kind of is add the method that boron agent prepares Boron Bearing Microalloy Steel with pig iron containing boron, belong to metallurgical technology field, carry out according to the following steps: (1) prepares technically pure iron, pig iron containing boron, ferro-titanium, manganese metal, iron-carbon, ferro-silicon and fine aluminium as raw material by set component; (2) technically pure iron in the raw material of preparation and iron-carbon are joined in induction furnace, ferro-silicon, fine aluminium, ferro-titanium, manganese metal and pig iron containing boron will be added successively after material melting, and melt under vacuum, pass into argon gas and carry out refining; (3) refining is cast into ingot casting after terminating, and is then heated to 1200 ± 10 DEG C of insulation 0.5 ~ 2h; (4) ingot casting after insulation is carried out two-phase control rolling; Acquisition steel rolling after finish to gauge completes; (5) by steel rolling with speed continuous coo1ing to 530 ~ 560 DEG C of 40 ~ 50 DEG C/s, then air cooling is to room temperature, makes Boron Bearing Microalloy Steel.Method synthesis cost of the present invention is low, is easy to realize industrialization, and the product performance of preparation are excellent, have a good application prospect.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of is add the method that boron agent prepares Boron Bearing Microalloy Steel with pig iron containing boron.
Background technology
The pig iron containing boron utilizing blast furnace iron boron separation process scheme to obtain, has the features such as convenient sources, low price, stable performance, mainly as the additive of boron for the production of antifriction cast iron.In order to more reasonably utilize limited boron resource, adhere to extracting Boron Slag for master to paigeite, and remaining pig iron containing boron can be used in other side.
The direct smelting boron steel of pig iron containing boron is utilized to be a research topic with practical significance, Appropriate application paigeite resource.The boron steel directly smelted using pig iron containing boron as raw material, just less demanding to the grade of boron in pig iron containing boron, due to silicon in pig iron containing boron and sulphur content higher, abundant desiliconization and desulfurization need be carried out to pig iron containing boron; In pig iron containing boron, Boron contents is about 0.20 ~ 1.0%, and be Boron contents (≤0.0040%) in the scope of national regulations in the boron-containing steel that guarantee is smelted, most of boron is directly oxidized or nitrogenize in smelting process, causes the actual recovery rate of boron on the low side; In order to make full use of the boron in pig iron containing boron, need to look for another way to the recycling of pig iron containing boron.Preparing boron steel with pig iron containing boron replacement ferro-boron as the additive of boron in steel is a new try, but the composition of contrast pig iron containing boron and ferro-boron is known, in pig iron containing boron, Boron contents is very low, and C, S content is much high, this just causes the S content in steel relatively high, how utilizing the active effect of the boron in pig iron containing boron to offset the negative influence of impurity S actual utilization during pig iron containing boron, is current urgent problem.
Summary of the invention
For the problems referred to above that existing pig iron containing boron exists in smelting boron steel technology, the invention provides a kind of is add the method that boron agent prepares Boron Bearing Microalloy Steel with pig iron containing boron, on carbon manganese steel basis, using pig iron containing boron as the additive of boron, independent interpolation trace B element, utilize two benches controlled rolling rolling and Controlled cooling process, develop the Boron Bearing Microalloy Steel of high-strong toughness.
Method of the present invention is carried out according to the following steps:
1, technically pure iron, pig iron containing boron, ferro-titanium, manganese metal, iron-carbon, ferro-silicon and fine aluminium is prepared as raw material by set component;
2, the technically pure iron in the raw material of preparation and iron-carbon are joined in induction furnace, under vacuum tightness 1 ~ 10Pa condition by whole material melting until liquid surface static, then argon gas is passed into vacuum tightness at 3000 ~ 4000Pa, add ferro-silicon, fine aluminium, ferro-titanium, manganese metal and pig iron containing boron successively, under temperature 1580 ~ 1620 DEG C of conditions, carry out refining, time static to bath surface, complete refining;
3, melt is cast into ingot casting after terminating by refining under vacuum tightness 3000 ~ 4000Pa and temperature 1580 ~ 1600 DEG C of conditions, then ingot casting is heated to 1200 ± 10 DEG C and is incubated 0.5 ~ 2h;
4, the ingot casting after insulation is carried out two-phase control rolling; First stage start rolling temperature is 1000 ~ 1150 DEG C, and finishing temperature is 900 ~ 950 DEG C, and draught is 40 ~ 60%; Subordinate phase start rolling temperature is 900 ~ 950 DEG C, and finishing temperature is 800 ~ 830 DEG C, and draught is 70 ~ 80%; Acquisition rolled sheet material after finish to gauge completes;
5, by rolled sheet material with speed continuous coo1ing to 530 ~ 560 DEG C of 40 ~ 50 DEG C/s, then air cooling is to room temperature, makes Boron Bearing Microalloy Steel, and its composition is by weight percentage containing C 0.08 ~ 0.12%, Si 0.3 ~ 0.4%, Mn 1.5 ~ 1.8%, Ti 0.03 ~ 0.04%, B 0.0015 ~ 0.0025%, Al 0.03 ~ 0.05%, S≤0.015%, P≤0.020%, surplus is Fe.
The yield strength of above-mentioned Boron Bearing Microalloy Steel is 700 ~ 750MPa, and tensile strength is 780 ~ 800 MPa, and elongation after fracture is 17 ~ 18%.
The room temperature impact merit of above-mentioned Boron Bearing Microalloy Steel is 65 ~ 70J, and the ballistic work of-40 DEG C is 64 ~ 66J.
The composition of above-mentioned pig iron containing boron is by weight percentage containing C 3.0 ~ 3.8%, Si 2.0 ~ 3.2%, Mn 0.08 ~ 0.12%, P≤0.06%, S≤0.12%, B 0.20 ~ 1.0%, and surplus is Fe.
The composition of above-mentioned ferro-titanium is by weight percentage containing C 0.25 ~ 0.30%, Si 0.40 ~ 0.50%, V 2.8 ~ 3.0%, P≤0.03%, S≤0.03%, Al 4.2 ~ 4.5%, Ti 69 ~ 71%, and surplus is Fe.
The composition of above-mentioned manganese metal is Mn containing C 0.07 ~ 0.08%, Si 0.30 ~ 0.4%, P≤0.03%, S≤0.03%, Fe 1.5 ~ 1.8%, surplus by weight percentage.
The composition of above-mentioned iron-carbon is by weight percentage containing C 3.10 ~ 4.00%, and surplus is Fe and inevitable impurity.
The composition of above-mentioned ferro-silicon is by weight percentage containing Si 74 ~ 76%, C 0.15 ~ 0.20%, P≤0.040%, S≤0.020%, Al 1.5 ~ 1.8%, and surplus is Fe.
Purity by weight >=99% of above-mentioned fine aluminium.
Purity by weight >=99% of above-mentioned technically pure iron, weight content≤0.02% of C.
Method of the present invention, by adopting pig iron containing boron as adding boron agent, by arranging refining and rolling condition, makes Boron Bearing Microalloy Steel of good performance; Do not add the microalloy elements such as the higher alloying elements cr of other added value, Mo, Ni etc. and Nb, V in preparation process, add Trace Aluminum and titanium less with deoxidation and denitrification, ensure to avoid when smelting the oxidized and nitrogenize of boron as far as possible.Method synthesis cost of the present invention is low, is easy to realize industrialization, and the product performance of preparation are excellent, have a good application prospect.
Embodiment
The iron-carbon adopted in the embodiment of the present invention is made up of pure iron and graphite melting, and the graphite of employing is commercial high purity graphite, carbon content 99.99%.
The technically pure iron adopted in the embodiment of the present invention, pig iron containing boron, ferro-titanium, manganese metal, ferro-silicon and fine aluminium are commercial products.
The induction furnace adopted in the embodiment of the present invention is vacuum medium frequency induction furnace.
The equipment being incubated 0.5 ~ 2h employing in the embodiment of the present invention under temperature 1200 ± 10 DEG C of conditions is electrical heater.
Cooling with the speed of 40 ~ 50 DEG C/s in the embodiment of the present invention is adopt Water-Curta in Cooling mode to cool, and speed of cooling is controlled by shower nozzle quantity and the water yield.
Equipment that in the embodiment of the present invention, rolling adopts is university's rolling technique and tandem rolling automatization National Key Laboratory (RAL) northeastward
Φ450 Hot Rolling Mill.
Carrying out performance test to product in the embodiment of the present invention is adopt GB/T 228-2002 metallic substance tensile testing at ambient temperature and GB GB/T 229-2007 metallic substance Charpy pendulum impact test method to test; Impact sample is small sample, is of a size of 55mm × 10mm × 5mm, V-type, and the ballistic work recorded is the half of standard impulse merit.
Embodiment 1
Technically pure iron, pig iron containing boron, ferro-titanium, manganese metal, iron-carbon, ferro-silicon and fine aluminium is prepared as raw material by set component;
Wherein the composition of pig iron containing boron is by weight percentage containing C 3.1%, Si 2.2%, Mn 0.08 %, P 0.05%, S 0.10%, B 0.85%, and surplus is Fe;
The composition of ferro-titanium is by weight percentage containing C 0.25%, Si 0.43%, V 2.8%, P 0.03%, S 0.03%, Al 4.5%, Ti 69.0%, and surplus is Fe;
The composition of manganese metal is Mn containing C 0.072%, Si 0.30%, P 0.02%, S 0.03%, Fe 1.8%, surplus by weight percentage;
The composition of iron-carbon is by weight percentage containing C 3.10%, and surplus is Fe and inevitable impurity;
The composition of ferro-silicon is by weight percentage containing Si 76%, C 0.15%, P 0.035%, S0.016%, Al 1.8%, and surplus is Fe;
Technically pure iron in the raw material of preparation and iron-carbon are joined in induction furnace, under vacuum tightness 1 ~ 10Pa condition by whole material melting until liquid surface static, then argon gas is passed into vacuum tightness at 3000 ~ 4000Pa, add ferro-silicon, fine aluminium, ferro-titanium, manganese metal and pig iron containing boron successively, under temperature 1580 ~ 1620 DEG C of conditions, carry out refining, time static to bath surface, complete refining;
After refining terminates, melt is cast into ingot casting under vacuum tightness 3000 ~ 4000Pa and temperature 1580 ~ 1600 DEG C of conditions, then ingot casting is heated to 1200 ± 10 DEG C and is incubated 0.5h;
Ingot casting after insulation is carried out two-phase control rolling; First stage start rolling temperature is 1130 DEG C, and finishing temperature is 940 DEG C, and draught is 60%; Subordinate phase start rolling temperature is 900 DEG C, and finishing temperature is 800 DEG C, and draught is 70%; Acquisition rolled sheet material after finish to gauge completes;
By rolled sheet material with the speed continuous coo1ing to 560 DEG C of 40 ~ 50 DEG C/s, then air cooling is to room temperature, makes Boron Bearing Microalloy Steel, and its composition is by weight percentage containing C 0.08%, Si 0.4%, Mn 1.5%, Ti 0.04%, B 0.0015%, S0.011%, P0.016%, surplus is Fe; The yield strength of Boron Bearing Microalloy Steel is 700 ~ 750MPa, and tensile strength is 780 ~ 800 MPa, and elongation after fracture is 17 ~ 18%; Room temperature impact merit is 65 ~ 70J, and the ballistic work of-40 DEG C is 64 ~ 66J.
Embodiment 2
Technically pure iron, pig iron containing boron, ferro-titanium, manganese metal, iron-carbon, ferro-silicon and fine aluminium is prepared as raw material by set component;
Wherein the composition of pig iron containing boron is by weight percentage containing C 3.4%, Si 2.3%, Mn 0.10%, P 0.05%, S 0.09%, B 0.72%, and surplus is Fe;
The composition of ferro-titanium is by weight percentage containing C 0.30%, Si 0.44%, V 2.9%, P 0.02%, S 0.02%, Al 4.4%, Ti 71.0%, and surplus is Fe;
The composition of manganese metal is Mn containing C 0.074%, Si 0.40%, P 0.03%, S 0.03%, Fe 1.7%, surplus by weight percentage;
The composition of iron-carbon is by weight percentage containing C 4.00%, and surplus is Fe and inevitable impurity;
The composition of ferro-silicon is by weight percentage containing Si 74%, C 0.20%, P0.036%, S 0.016%, Al 1.7%, and surplus is Fe;
Technically pure iron in the raw material of preparation and iron-carbon are joined in induction furnace, under vacuum tightness 1 ~ 10Pa condition by whole material melting until liquid surface static, then argon gas is passed into vacuum tightness at 3000 ~ 4000Pa, add ferro-silicon, fine aluminium, ferro-titanium, manganese metal and pig iron containing boron successively, under temperature 1580 ~ 1620 DEG C of conditions, carry out refining, time static to bath surface, complete refining;
After refining terminates, melt is cast into ingot casting under vacuum tightness 3000 ~ 4000Pa and temperature 1580 ~ 1600 DEG C of conditions, then ingot casting is heated to 1200 ± 10 DEG C and is incubated 1h;
Ingot casting after insulation is carried out two-phase control rolling; First stage start rolling temperature is 1080 DEG C, and finishing temperature is 920 DEG C, and draught is 40%; Subordinate phase start rolling temperature is 950 DEG C, and finishing temperature is 830 DEG C, and draught is 80%; Acquisition rolled sheet material after finish to gauge completes;
By rolled sheet material with the speed continuous coo1ing to 560 DEG C of 40 ~ 50 DEG C/s, then air cooling is to room temperature, makes Boron Bearing Microalloy Steel, and its composition is by weight percentage containing C 0.12%, Si 0.3%, Mn 1.8%, Ti 0.03%, B 0.0025%, S 0.014%, P 0.017%, surplus is Fe; The yield strength of Boron Bearing Microalloy Steel is 750MPa, and tensile strength is 780 MPa, and elongation after fracture is 17%; Room temperature impact merit is 65J, and the ballistic work of-40 DEG C is 64J.
Embodiment 3
Technically pure iron, pig iron containing boron, ferro-titanium, manganese metal, iron-carbon, ferro-silicon and fine aluminium is prepared as raw material by set component;
Wherein the composition of pig iron containing boron is by weight percentage containing C 3.3%, Si 2.9%, Mn 0.11%, P 0.05%, S 0.10%, B 0.20%, and surplus is Fe;
The composition of ferro-titanium is by weight percentage containing C 0.26%, Si 0.45%, V 3.0%, P 0.03%, S 0.02%, Al 4.3%, Ti 69.8%, and surplus is Fe;
The composition of manganese metal is Mn containing C 0.071%, Si 0.35%, P 0.01%, S 0.02%, Fe 1.6%, surplus by weight percentage;
The composition of iron-carbon is by weight percentage containing C 3.62%, and surplus is Fe and inevitable impurity;
The composition of ferro-silicon is by weight percentage containing Si 76%, C 0.17%, P 0.032%, S 0.019%, Al 1.6%, and surplus is Fe;
Technically pure iron in the raw material of preparation and iron-carbon are joined in induction furnace, under vacuum tightness 1 ~ 10Pa condition by whole material melting until liquid surface static, then argon gas is passed into vacuum tightness at 3000 ~ 4000Pa, add ferro-silicon, fine aluminium, ferro-titanium, manganese metal and pig iron containing boron successively, under temperature 1580 ~ 1620 DEG C of conditions, carry out refining, time static to bath surface, complete refining;
After refining terminates, melt is cast into ingot casting under vacuum tightness 3000 ~ 4000Pa and temperature 1580 ~ 1600 DEG C of conditions, then ingot casting is heated to 1200 ± 10 DEG C and is incubated 1.5h;
Ingot casting after insulation is carried out two-phase control rolling; First stage start rolling temperature is 1100 DEG C, and finishing temperature is 930 DEG C, and draught is 50%; Subordinate phase start rolling temperature is 930 DEG C, and finishing temperature is 820 DEG C, and draught is 75%; Acquisition rolled sheet material after finish to gauge completes;
By rolled sheet material with the speed continuous coo1ing to 550 DEG C of 40 ~ 50 DEG C/s, then air cooling is to room temperature, makes Boron Bearing Microalloy Steel, and its composition is by weight percentage containing C 0.11%, Si 0.32%, Mn 1.65%, Ti 0.032%, B 0.0022%, S0.013%, P0.020%, surplus is Fe; The yield strength of Boron Bearing Microalloy Steel is 700MPa, and tensile strength is 800 MPa, and elongation after fracture is 18%; Room temperature impact merit is 70J, and the ballistic work of-40 DEG C is 66J.
Embodiment 4
Technically pure iron, pig iron containing boron, ferro-titanium, manganese metal, iron-carbon, ferro-silicon and fine aluminium is prepared as raw material by set component;
Wherein the composition of pig iron containing boron is by weight percentage containing C 3.0%, Si 3.2%, Mn 0.08%, P 0.06%, S 0.12%, B 1.0%, and surplus is Fe;
The composition of ferro-titanium is by weight percentage containing C 0.28%, Si 0.40%, V 3.0%, P 0.02%, S 0.03%, Al 4.2%, Ti 70.4%, and surplus is Fe;
The composition of manganese metal is Mn containing C 0.08%, Si 0.39%, P 0.02%, S 0.02%, Fe 1.8%, surplus by weight percentage;
The composition of iron-carbon is by weight percentage containing C 3.54%, and surplus is Fe and inevitable impurity;
The composition of ferro-silicon is by weight percentage containing Si 75%, C 0.19%, P 0.038%, S 0.017%, Al 1.8%, and surplus is Fe;
Technically pure iron in the raw material of preparation and iron-carbon are joined in induction furnace, under vacuum tightness 1 ~ 10Pa condition by whole material melting until liquid surface static, then argon gas is passed into vacuum tightness at 3000 ~ 4000Pa, add ferro-silicon, fine aluminium, ferro-titanium, manganese metal and pig iron containing boron successively, under temperature 1580 ~ 1620 DEG C of conditions, carry out refining, time static to bath surface, complete refining;
After refining terminates, melt is cast into ingot casting under vacuum tightness 3000 ~ 4000Pa and temperature 1580 ~ 1600 DEG C of conditions, then ingot casting is heated to 1200 ± 10 DEG C and is incubated 2h;
Ingot casting after insulation is carried out two-phase control rolling; First stage start rolling temperature is 1150 DEG C, and finishing temperature is 950 DEG C, and draught is 60%; Subordinate phase start rolling temperature is 940 DEG C, and finishing temperature is 830 DEG C, and draught is 80%; Acquisition rolled sheet material after finish to gauge completes;
By rolled sheet material with the speed continuous coo1ing to 540 DEG C of 40 ~ 50 DEG C/s, then air cooling is to room temperature, makes Boron Bearing Microalloy Steel, and its composition is by weight percentage containing C 0.09%, Si 0.36%, Mn 1.71%, Ti 0.033%, B 0.0017%, S 0.011%, P 0.019%, surplus is Fe; The yield strength of Boron Bearing Microalloy Steel is 720MPa, and tensile strength is 790 MPa, and elongation after fracture is 17%; Room temperature impact merit is 68J, and the ballistic work of-40 DEG C is 65J.
Embodiment 5
Technically pure iron, pig iron containing boron, ferro-titanium, manganese metal, iron-carbon, ferro-silicon and fine aluminium is prepared as raw material by set component;
Wherein the composition of pig iron containing boron is by weight percentage containing C 3.8%, Si 2.0%, Mn 0.12%, P 0.04%, S 0.11%, B 0.64%, and surplus is Fe;
The composition of ferro-titanium is by weight percentage containing C 0.29%, Si 0.50%, V 3.0%, P0.03%, S 0.02%, Al 4.5%, Ti 70.6%, and surplus is Fe;
The composition of manganese metal is Mn containing C 0.07%, Si 0.38%, P 0.03%, S 0.03%, Fe 1.5%, surplus by weight percentage;
The composition of iron-carbon is by weight percentage containing C 3.79%, and surplus is Fe and inevitable impurity;
The composition of ferro-silicon is by weight percentage containing Si 74%, C 0.11%, P 0.035%, S 0.018%, Al 1.5%, and surplus is Fe;
Technically pure iron in the raw material of preparation and iron-carbon are joined in induction furnace, under vacuum tightness 1 ~ 10Pa condition by whole material melting until liquid surface static, then argon gas is passed into vacuum tightness at 3000 ~ 4000Pa, add ferro-silicon, fine aluminium, ferro-titanium, manganese metal and pig iron containing boron successively, under temperature 1580 ~ 1620 DEG C of conditions, carry out refining, time static to bath surface, complete refining;
After refining terminates, melt is cast into ingot casting under vacuum tightness 3000 ~ 4000Pa and temperature 1580 ~ 1600 DEG C of conditions, then ingot casting is heated to 1200 ± 10 DEG C and is incubated 2h;
Ingot casting after insulation is carried out two-phase control rolling; First stage start rolling temperature is 1000 DEG C, and finishing temperature is 900 DEG C, and draught is 40%; Subordinate phase start rolling temperature is 910 DEG C, and finishing temperature is 810 DEG C, and draught is 70%; Acquisition rolled sheet material after finish to gauge completes;
By rolled sheet material with the speed continuous coo1ing to 530 DEG C of 40 ~ 50 DEG C/s, then air cooling is to room temperature, makes Boron Bearing Microalloy Steel, and its composition is by weight percentage containing C 0.09%, Si 0.37%, Mn 1.54%, Ti 0.031%, B 0.0019%, S0.015%, P0.018%, surplus is Fe; The yield strength of Boron Bearing Microalloy Steel is 740MPa, and tensile strength is 790 MPa, and elongation after fracture is 18%; Room temperature impact merit is 69J, and the ballistic work of-40 DEG C is 66J.
Claims (3)
1. be add the method that boron agent prepares Boron Bearing Microalloy Steel with pig iron containing boron, it is characterized in that carrying out according to the following steps:
(1) technically pure iron, pig iron containing boron, ferro-titanium, manganese metal, iron-carbon, ferro-silicon and fine aluminium is prepared as raw material by set component; The composition of described pig iron containing boron is by weight percentage containing C 3.0 ~ 3.8%, Si 2.0 ~ 3.2%, Mn 0.08 ~ 0.12%, P≤0.06%, S≤0.12%, B 0.20 ~ 1.0%, and surplus is Fe;
(2) technically pure iron in the raw material of preparation and iron-carbon are joined in induction furnace, under vacuum tightness 1 ~ 10Pa condition by whole material melting until liquid surface static, then argon gas is passed into vacuum tightness at 3000 ~ 4000Pa, add ferro-silicon, fine aluminium, ferro-titanium, manganese metal and pig iron containing boron successively, under temperature 1580 ~ 1620 DEG C of conditions, carry out refining, time static to bath surface, complete refining;
(3) melt is cast into ingot casting after terminating by refining under vacuum tightness 3000 ~ 4000Pa and temperature 1580 ~ 1600 DEG C of conditions, then ingot casting is heated to 1200 ± 10 DEG C and is incubated 0.5 ~ 2h;
(4) ingot casting after insulation is carried out two-phase control rolling; First stage start rolling temperature is 1000 ~ 1150 DEG C, and finishing temperature is 900 ~ 950 DEG C, and draught is 40 ~ 60%; Subordinate phase start rolling temperature is 900 ~ 950 DEG C, and finishing temperature is 800 ~ 830 DEG C, and draught is 70 ~ 80%; Acquisition rolled sheet material after finish to gauge completes;
(5) rolled sheet material is cooled to 530 ~ 560 DEG C with the speed of 40 ~ 50 DEG C/s, then air cooling is to room temperature, makes Boron Bearing Microalloy Steel, and its composition is by weight percentage containing C 0.08 ~ 0.12%, Si 0.3 ~ 0.4%, Mn 1.5 ~ 1.8%, Ti 0.03 ~ 0.04%, B 0.0015 ~ 0.0025%, Al 0.03 ~ 0.05%, S≤0.015%, P≤0.020%, surplus is Fe.
2. according to claim 1 a kind of be add the method that boron agent prepares Boron Bearing Microalloy Steel with pig iron containing boron, it is characterized in that the yield strength of described Boron Bearing Microalloy Steel is 700 ~ 750MPa, tensile strength is 780 ~ 800 MPa, and elongation after fracture is 17 ~ 18%.
3. according to claim 1 a kind of be add the method that boron agent prepares Boron Bearing Microalloy Steel with pig iron containing boron, it is characterized in that the room temperature impact merit of described Boron Bearing Microalloy Steel is 65 ~ 70J, the ballistic work of-40 DEG C is 64 ~ 66J.
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