CN110343943A - A kind of high nitrogen alloy hardening agent and its application - Google Patents
A kind of high nitrogen alloy hardening agent and its application Download PDFInfo
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Abstract
The invention belongs to field of steel metallurgy, and in particular, to a kind of high nitrogen alloy hardening agent and its application.High nitrogen alloy hardening agent of the invention, raw material composition includes: ferrosilicon 40~55%, silicomangan 30~40%, silicon carbide 4~6% and iron powder 10~20% by weight percentage.Further, the chemical composition comprises the following components in percentage by weight of the high nitrogen alloy hardening agent includes: C :≤4.5%, Si:25~45%, Mn:10~15%, N:16~30%, remaining is iron and inevitable impurity.The present invention does not change existing smelting and rolling equipment, thus can reduce cost of alloy, can be promoted the use of in other screw-thread steels, H profile steel manufacturing enterprise.The comprehensive utilization for realizing low price resource reduces the dosage of vanadium alloy, improves steel enterprise economic benefit, environmental pressure caused by reducing because of exploitation vanadium resource.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular, to a kind of high nitrogen alloy hardening agent and its application.
Background technique
Spiral new standard (GB/T 1499.2-2018) is implemented on November 1st, 2018, and new standard increases macro
See metallographic structure, microstructure, the method for inspection of section Vickers hardness.New standard generates tempered martensite after rolling after executing
Immediate quenching technique (wearing hydraulic art by force) be eliminated, if without multicomponent alloy optimum organization (alloy strengthening combination) and control
The cold process optimization of control is rolled improve, be bound to can only by be greatly improved silicon in steel, manganese, vanadium content meet new standard
Requirement to microstructure and property.Recent VN alloy price is higher always (VN alloy price is more than 200,000 at present), every increase
0.01% vanadium, ton steel cost increase nearly 34 yuan；Ferrocolumbium price is more than 200,000, and the niobium of every increase by 0.01%, ton steel needs
Increase nearly 40 yuan), silicon, manganese alloy price also have biggish rise, heavy pressure is brought to the production cost of spiral,
Niobium, the vanadium equal size in steel are reduced, to vanadium, niobium resource is saved, promotes Iron and Steel Enterprises in China economic benefit, reduces environmental pressure tool
There is important realistic meaning.
Under vertical bar spiral (12~32mm of diameter) traditional processing technology and appointed condition, the one of reinforced steel bar strength is improved
As approach are as follows:
1) it combines and controls cold technique, carry out the microalloy treatments such as Nb, V, Ti, B, increase precipitation strength (precipitation strength) effect
Fruit；
2) content for improving the solution strengthening elements such as C, Si, Mn, Cr, improves solid solution strengthening effect；
3) it carries out controlled rolling and control cools down, the main effect for increasing phase transformation strengthening and refined crystalline strengthening.
After spiral new standard (GB/T 1499.2-2018) executes, (water conservancy project is worn by force using rear immediate quenching technique is rolled
Skill) Lai Zengjia phase transformation strengthening and promote refined crystalline strengthening method certainly will eliminate.Therefore do not add or reduce precious metal niobium with
On the basis of vanadium, expensive alloying elements are replaced to guarantee precipitating reinforcing effect using relatively inexpensive alloying element, optimum organization is solid
Molten intensified element increases solid solution strengthening effect, and guarantees the effect of refined crystalline strengthening by cooling control after rolling, is trend of the times.?
It under the premise of meeting new national standard performance and organizational requirements, prevents reinforcing bar cold bed from corroding, is this life where present invention process key technology
Production method will effectively promote the economic benefit of iron and steel enterprise.
Summary of the invention
It is an object of the present invention to solve the above problems, provide a kind of high nitrogen alloy hardening agent and its application.
The present invention is that a kind of set smelting molten steel, slab heating, spiral cooling control after rolling and complex intensifying alloy are matched
The innovative technology made and used.
In order to achieve the above objectives, the invention is realized by the following technical scheme:
High nitrogen alloy hardening agent provided by the invention, raw material composition includes: that raw material mainly includes by weight percentage
Ferrosilicon 40~55%, silicomangan 30~40% (silicone content 16~19%, manganese content 64~68%, remaining is iron and impurity),
Silicon carbide 4~6% and iron powder 10~20%.
Further, the preparation method of high nitrogen alloy hardening agent of the present invention, comprising the following steps:
By raw material carry out smashing and grinding be sufficiently mixed, carry out compacting material block, the specification present invention for expecting block without limitation,
It can be with the arbitrarily satisfactory specification in this field, for example, 40mm × 50mm × 50mm or so size.
Material block is placed in the push plate of pushed bat kiln heating zone, while being passed through nitrogen into kiln body, in the gas of nitrogen protection
Nitrogen treatment is carried out under atmosphere, cooling treatment after high-temperature heating treatment, obtains high nitrogen alloy at 1600-1650 DEG C.
High nitrogen alloy hardening agent according to the present invention, wherein the chemical component of the high nitrogen alloy hardening agent is by weight
Measure percentages are as follows: C :≤4.5% (as a kind of selection, C can be 1~4.5%), Si:25~45%, Mn:10~15%,
N:16~30%, remaining is iron and inevitable impurity.
A certain amount of silicon carbide is added in high nitrogen alloy hardening agent of the invention, and component contains certain C, when being passed through in kiln body
Nitrogen can occur to synthesize Si3N4Carbothermic reduction reaction improves the nitrogen content of high nitrogen alloy.
The present invention also provides application of the above-mentioned high nitrogen alloy hardening agent in steel preparation, especially prepare spiral shell in production
Application in terms of line steel and H profile steel.
Based on above-mentioned application, the present invention provides a kind of preparation methods of steel, comprising the following steps:
(a) molten iron pre-processes；
(b) it when the S content of molten iron is no more than 0.015%, and molten iron temperature is not less than 1280 DEG C, is just made steel using converter
Water；
(c) it when P content is no more than 0.020% in molten steel, taps to ladle；
(d) ladle tapping one third arrive half when, into ladle addition barium deoxidier, then add in silicomangan
When adding to one third to 3/4ths, it is initially added into VN alloy and above-mentioned high nitrogen alloy composite enhancer of the invention, is added
0.35~0.4kg/ tons of steel of VN alloy, adjustment molten steel V content are between 0.02~0.025%, wherein high nitrogen alloy complex intensifying
Agent additional amount is 0.3~0.7kg/ tons of steel；
(e) it is 1.35~1.60% that adjustment molten steel Si content, which is 0.25~0.45%, Mn content,；C content be 0.22~
0.25%；
(f) processing of soft blow argon is carried out to molten steel.
The preparation method of steel according to the present invention, wherein preferably, 0.5~1kg/t Si-Ca-Ba is used in step (d)
Carry out pre-deoxidation；The dirty place of molten steel is added using a bag mode is manually thrown away in VN.
The preparation method of steel according to the present invention, wherein preferably, being controlled in step (e) using silicomanganese, ferrosilicon
The Si content of molten steel adjusts carbon content using graphite carburant using the Mn content of silicomanganese adjustment molten steel.
The preparation method of steel according to the present invention, wherein preferably, the soft argon blowing time of molten steel is not less than in step (f)
8 minutes.
The preparation method of steel according to the present invention, wherein further including being carried out after step (f) to molten steel preferably
The step of continuous casting and continuous casting billet milling, continuous casting billet heating time controlled within 180 minutes, and soaking temperature is no more than
1200.Breaking down start rolling temperature controls between 1100-1150 DEG C, and finish rolling start rolling temperature controls the finish to gauge between 900-1020 DEG C
Temperature controls between 820-920 DEG C.
The preparation method of steel according to the present invention, wherein preferably, cold bed on steel being controlled after continuous casting rolling and is replied
Temperature (throwing steel temperature) is at 820~920 DEG C.
The present invention is suitable for the steel of any kind, especially screw-thread steel and H profile steel.Such as, but not limited to, it is a kind of chemistry at
It is grouped as screw-thread steel following by weight percentage: C:0.22~0.25%, Si:0.25~0.45%, Mn:1.35~
1.60%, V:0.02~0.025%, P≤0.030%, S≤0.025%, remaining is Fe and inevitable impurity.
Specifically, critical process of the invention is as follows:
For molten steel after converter is completed to smelt, 0.5~1kg/ tons of steel barium deoxidiers are added in ton steel, if molten steel has peroxidating existing
As when being lower than 0.05% such as carbon content, then the amount of deoxidier can be increased suitably to reduce the content of oxygen in steel.In converter tapping mistake
Cheng Zhong is initially added into VN alloy and 0.3~0.7kg/ tons of steel high nitrogen alloys is compound when one third or so is added in silicomangan
Hardening agent；Molten steel must stir argon gas greatly after entering argon station, and the time is not less than 3 minutes, so as to the temperature and ingredient of uniform molten steel；
Molten steel composition is controlled in following range: C:0.22~0.25%, Si:0.25~0.45%, Mn:1.35~1.60%, V:0.02
~0.025%, P≤0.030%, S≤0.025%；Continuous casting billet heating time controls within 180 minutes (if being more than this time
Bringing-up section and soaking zone furnace temperature must be reduced to 1000 DEG C or less), soaking temperature is no more than 1200 DEG C；The steel of 20~25mm of diameter
Cold bed recovery temperature (throwing steel temperature) control cold bed recovery temperature on 830~900 DEG C, 12~18mm reinforcing bar (throws steel temperature on muscle
Degree) on 820~900 DEG C, 28~40mm reinforcing bar cold bed recovery temperature (throw steel temperature) at 840~920 DEG C；
Reach 425~470MPa by above-mentioned production technology reinforcement yielding intensity produced, strong flexor ratio (tensile strength/
Yield strength) reach 1.38 or more, metallographic structure is pearlite+ferritic structure, and reinforcing bar rolls rear non-corrosive, and surface quality is good
It is good, the dosage of VN alloy is reduced, opposite original process, this technique reduces by 0.01% or more content of vanadium in steel；Using this technique
Relatively former plus vanadium technique, ton steel cost significantly reduce.
High nitrogen alloy composite enhancer of the invention can be also used for low-alloy high-strength H profile steel, process for making and screw thread
The production technology of steel is identical, and molten steel composition is controlled in following range: C:0.16~0.20%, Si:0.25~0.45%, Mn:
1.35~1.50%, V:0.015~0.020%, P≤0.025%, S≤0.020%, remaining is Fe and inevitable impurity；Even
Slab heating time controlled within 200 minutes, and soaking temperature is no more than 1210 DEG C；The H profile steel of 700 × 300mmQ345B of specification
Breaking down start rolling temperature controls between 1150~1200 DEG C, and finish rolling start rolling temperature controls the finishing temperature between 980~1050 DEG C
Control is between 850~920 DEG C.
The present invention has the following advantage:
1. technological operation is simple, do not change existing smelting and rolling equipment, thus cost of alloy can be reduced, it can be in other spiral shells
It is promoted the use of in line steel, H profile steel manufacturing enterprise.
2. realizing the comprehensive utilization of low price resource, the dosage of vanadium alloy is reduced, steel enterprise economic benefit is improved,
Environmental pressure caused by reducing because of exploitation vanadium resource.
The invention can reduce spiral, H profile steel production cost, greatly promote entire spiral, H profile steel industry production
Level is worth further genralrlization, can bring preferable economic benefit and social benefit.
Detailed description of the invention
Technology key control point flow diagram when Fig. 1 is high nitrogen alloy composite enhancer application of the invention；
Fig. 2 is the metallographic structure figure of the screw-thread steel prepared in the embodiment of the present invention；Wherein, a, b are existing HRB400E steel,
C, d is screw-thread steel of the invention.
Specific embodiment
The present invention is described in detail With reference to embodiment.
Embodiment 1
It is each to advise by following operating procedure main points by taking the 50 tons of converters of Laiwu branch company, Shandong Iron & Steel Co., Ltd. as an example
Lattice reinforcement yielding intensity is in 425MPa or more, and for strong flexor ratio 1.40 or more, rebar surface non-corroding is specific as follows:
1, existing HRB400E steel chemical composition
Existing HRB400E test its ingredient of steel is shown in Table 1
1 HRB400E of table tests reinforcing bar Composition Control (12~28mm reinforcing bar)
2, steel-making continuous casting main points of processes control
1) tapping must be added to containing aluminium deoxidizer progress deoxidation early period, if endpoint carbon content is lower than 0.05%, appropriate increasing
The amount of killing at least increases by 20%.
2) tapping early period and mid-term must big nitrogen gas stirring, the later period suitably turns down, and does not see and causes down to prevent the tapping later period
Slag.
3) high nitrogen alloy hardening agent silicomangan be added one third after in time be added (bench-scale testing is put into hand,
Every parcel 10kg, normal amount postpartum can high hopper be added), after tapping must big nitrogen gas stirring be not less than 3 minutes；
The raw material composition of high nitrogen alloy hardening agent includes: ferrosilicon powder 45%, 30% (silicon of silicomangan by weight percentage
Silicone content 16% in manganese alloy, manganese content 68%), silicon carbide 5% and iron powder 20%.
3, rolling mill practice control requires
1) start rolling temperature: 980-1080 DEG C.
2) at 835-885 DEG C, 12~18mm is straight for cold bed recovery temperature (throwing steel temperature) control in 20~25mm straight steel bar
(the throwing steel temperature) control of cold bed recovery temperature is at 825~880 DEG C on reinforcing bar, and 28, cold bed recovery temperature (throws steel on 32mm reinforcing bar
Temperature) it controls at 840~870 DEG C.
4, practical condition
4.1 practical composition controls
Test steel actual constituent control manufactured in the present embodiment is shown in Table 2
Table 2 tests reinforcing bar actual constituent control (12~28mm reinforcing bar)
2 test reinforcing bar actual constituent controls are compared with ingredient before, and C, Si, Mn variation are little, but V is reduced
0.01%, and it is more stable.
4.2 mechanical properties (12~28mm reinforcing bar)
The test practical mechanical property range of steel fully meets company standard, and opposite national standard surplus capacity is larger, is specifically shown in Table 3
Table 3 tests steel mechanical property (12~28mm reinforcing bar)
4.3 metallographic structure
Metallographic structure is pearlite+ferritic structure, complies fully with new standard (GB/T 1499.2-2018) requirement, sees figure
Shown in 2a~2d.It can be seen from the figure that rebar matrix tissue is pearlite and ferrite, organize highly uniform and without exception
Tissue.The rebar surface quality of the invention no significant difference compared with existing screw-thread steel.
Embodiment 2
It is each to advise by following operating procedure main points by taking the 120 tons of converters of Laiwu branch company, Shandong Iron & Steel Co., Ltd. as an example
Lattice H profile steel yield strength is specific as follows in 375MPa or more:
1, existing Q345B steel chemical composition
Existing Q345B test its ingredient of H profile steel steel is shown in Table 1
1 Q345B of table tests H profile steel Composition Control (700 × 300mm)
2, steel-making continuous casting main points of processes control
1) tapping must be added to containing aluminium deoxidizer progress deoxidation early period, if endpoint carbon content is lower than 0.05%, appropriate increasing
The amount of killing at least increases by 20%.
2) tapping early period and mid-term must big nitrogen gas stirring, the later period suitably turns down, and does not see and causes down to prevent the tapping later period
Slag.
3) high nitrogen alloy hardening agent silicomangan be added one third after in time be added (bench-scale testing is put into hand,
Every parcel 10kg, normal amount postpartum can high hopper be added), after tapping must big nitrogen gas stirring be not less than 3 minutes；
The raw material composition of high nitrogen alloy hardening agent includes: ferrosilicon powder 50%, 30% (silicon of silicomangan by weight percentage
Silicone content 19% in manganese alloy, manganese content 64%), silicon carbide 6% and iron powder 14%.
Continuous casting billet heating time controlled within 200 minutes, and soaking temperature is no more than 1210 DEG C；Specification 700 ×
The H profile steel breaking down start rolling temperature of 300mmQ345B controls between 1150-1200 DEG C, and finish rolling start rolling temperature is controlled in 980-1050
Between DEG C, finishing temperature control is between 850-920 DEG C.
3, rolling mill practice control requires
1) start rolling temperature: 1150-1200 DEG C.
2) the H profile steel finish rolling start rolling temperature of 700 × 300mmQ345B of specification controls the finishing temperature between 980-1050 DEG C
Control is between 850-920 DEG C.
4, practical condition
4.1 practical composition controls
Test steel actual constituent control manufactured in the present embodiment is shown in Table 2
Table 2 tests steel actual constituent and controls (700 × 300mmQ345B) %
2 test steel actual constituent controls are compared with ingredient before, and C, Si, Mn variation are little, but V reduces 0.012%,
Composition Control is also more stable.
4.2 mechanical properties (700 × 300mmQ345B)
The test practical mechanical property range of steel fully meets company standard, and opposite national standard surplus capacity is larger, is specifically shown in Table 3
Table 3 tests steel mechanical property
4.3 metallographic structure
The H profile steel metallographic structure of 700 × 300mmQ345B is pearlite+ferritic structure, tissue without exception.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (10)
1. a kind of high nitrogen alloy hardening agent, which is characterized in that the raw material composition of the high nitrogen alloy hardening agent is by weight percentage
Meter includes: ferrosilicon powder 40~55%, silicomangan 30~40%, silicon carbide 4~6% and iron powder 10~20%.
2. high nitrogen alloy hardening agent according to claim 1, which is characterized in that the high nitrogen alloy hardening agent chemistry at
Divide includes: C by weight percentage :≤4.5%, Si:25~45%, Mn:10~15%, N:16~30%.
3. a kind of preparation method of high nitrogen alloy hardening agent as claimed in claim 1 or 2, comprising the following steps:
Raw material is carried out smashing and grinding to be sufficiently mixed, then carries out compacting material block；
Block is placed in the push plate of pushed bat kiln heating zone, while being passed through nitrogen into kiln body, under the atmosphere of nitrogen protection
Nitrogen treatment is carried out, it is cooling after heat treatment, obtain high nitrogen alloy.
4. application of the high nitrogen alloy hardening agent as claimed in claim 1 or 2 in steel preparation.
5. a kind of preparation method of steel, comprising the following steps:
(a) molten iron pre-processes；
(b) when the S content of molten iron is no more than 0.015%, and molten iron temperature is not less than 1280 DEG C, water is just made steel using converter；
(c) it when P content is no more than 0.020% in molten steel, taps to ladle；
(d) when ladle taps one third, barium deoxidier is added into ladle, then three are added in silicomangan/
For the moment, it is initially added into VN alloy and high nitrogen alloy hardening agent as claimed in claim 1 or 2, adjustment molten steel V content is 0.025~
Between 0.028%；
(e) it is 1.35~1.60% that adjustment molten steel Si content, which is 0.25~0.45%, Mn content,；C content is 0.22~0.25%；
(f) processing of soft blow argon is carried out to molten steel.
6. the preparation method of steel according to claim 5, which is characterized in that use 0.5~1kg/t silico-calcium in step (d)
Barium carries out pre-deoxidation；The dirty place of molten steel is added using a bag mode is manually thrown away in VN.
7. the preparation method of steel according to claim 5, which is characterized in that controlled in step (e) using silicomanganese, ferrosilicon
The Si content of molten steel adjusts carbon content using graphite carburant using the Mn content of silicomanganese adjustment molten steel.
8. the preparation method of steel according to claim 5, which is characterized in that the soft argon blowing time of molten steel is not small in step (f)
In 8 minutes.
9. the preparation method of steel according to claim 5, which is characterized in that further include after the step (f) to molten steel into
The step of row continuous casting and slab rolling, continuous casting billet heating time controlled within 180 minutes, and soaking temperature is no more than 1200
℃。
10. the preparation method of steel according to claim 9, which is characterized in that control cold bed on steel after continuous casting billet milling
Recovery temperature is at 820~920 DEG C.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354116A (en) * | 2022-06-27 | 2022-11-18 | 武汉鑫能科技有限公司 | Reinforcing agent for steel making for improving performance of threaded steel bar and preparation and use methods thereof |
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| CN108660378A (en) * | 2018-06-15 | 2018-10-16 | 河南科技大学 | A kind of high nitrogen alloy steel and preparation method thereof |
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| FR2281986A1 (en) * | 1974-08-16 | 1976-03-12 | Hitachi Ltd | NITROGEN ADDITIVE FOR THE REINFORCEMENT OF REFINED CAST IRON |
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| CN115354116A (en) * | 2022-06-27 | 2022-11-18 | 武汉鑫能科技有限公司 | Reinforcing agent for steel making for improving performance of threaded steel bar and preparation and use methods thereof |
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