CN106244899B - A kind of energy-conservation smelting technology of 42CrMo - Google Patents
A kind of energy-conservation smelting technology of 42CrMo Download PDFInfo
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- CN106244899B CN106244899B CN201610708342.8A CN201610708342A CN106244899B CN 106244899 B CN106244899 B CN 106244899B CN 201610708342 A CN201610708342 A CN 201610708342A CN 106244899 B CN106244899 B CN 106244899B
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- 42crmo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/006—Making ferrous alloys compositions used for making ferrous alloys
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to the technical field of smelting of alloy cast steel, and in particular to the energy-conservation smelting technology technical field of 42CrMo a kind of；The technique includes melting, slag making, skims, crystal grain thinning, deoxidation, desulfurization, the step such as cast；Smelting technology step provided by the invention is simple, energy-conserving and environment-protective, effectively increases the heat utilization ratio of smelting furnace, helps to save the energy, reduces production cost.
Description
Technical field
The present invention relates to the technical field of smelting of alloy cast steel, and in particular to the energy-conservation smelting technology technology of 42CrMo a kind of
Field.
Background technology
42CrMo steel belongs to unimach, has high intensity and toughness, quenching degree is also preferable, without obvious Temper brittleness
Property, there is higher fatigue limit and an anti-repeat impact ability after modifier treatment, low-temperature impact toughness is good.Available for manufacture compared with
35CrMo hardness of steel requires the bigger forging in higher and quenched section, gear wheel, intensifier driven gear such as locomotive traction,
Pressure vessel gear, rear axle, greatly connecting rod and spring clip loaded, it can also be used to below 2000m oil deep-well tool joints
With fishing tool, and it can be used for the mould of bender etc..But 42CrMo, when melting, process is complicated, melt
It is low to refine efficiency.
To solve the problems, such as that efficiency is low in fusion process, the A of Chinese invention patent application publication No. CN 105648301 are public
A kind of 42CrMo smelting technologies are opened, by being provided with charging, slag making, sampling are skimmed, deoxidation, thermometric plus ferrosilicon, are tapped, poured
The steps such as note so that 42CrMo smelting efficiency greatly improves.But the smelting technology, in charge melted, direct use will be useless
Steel and molybdenum-iron mixing carry out energization thawing, but dystectic molybdenum-iron is difficult to melt, and this will certainly bring the energy expenditure of technique
Rate is high so that 42CrMo's is smelted into height.
The content of the invention
In view of the shortcomings of the prior art, the invention provides a kind of step is simple, energy-conserving and environment-protective, heat utilization ratio is high, raw
Produce the low 42CrMo of cost energy-conservation smelting technology.
To realize object above, the present invention is achieved by the following technical programs：
The energy-conservation smelting technology of 42CrMo a kind of, comprises the following steps：
(1) by reducing agent, give up in chromium steel and molybdenum-iron addition intermediate frequency furnace, the pressure for making grate surface is 0.3-0.5mmH2O
Post；
(2) with 280-350 DEG C/h temperature rise speed, furnace temperature is risen to 1580-1610 DEG C, is incubated 20-30min；
(3) ferromanganese is put into stove, and with 105-130 DEG C/h temperature rise speed, furnace temperature is risen to 1840-1860 DEG C；
(4) sample and adjust constituent content；
(5) slag making materials is put into stove, molten steel is stirred with 45-60r/min mixing speed, when in-furnace temperature is down to
At 1450-1520 DEG C, you can turndown is skimmed；
(5) under the conditions of electromagnetic agitation, grain refiner is added, obtains fine grain structure；
(6) deoxidization desulfuration：
(7) molten steel calm 1-4min in bag, when being down to 1395-1424 DEG C to temperature, is poured into a mould.
Further, reducing agent is the composition of coke and ferrosilicon powder in the step (1).
Further, obtained element mass percent is adjusted in the step (4) is：Carbon：0.42-0.46wt%, silicon：
0.24-0.35wt%, manganese：0.55-0.92wt%, chromium：1.1-1.3wt%, molybdenum：0.16-0.22wt%, surplus are iron and can not
The other elements avoided.
Further, the slag making materials is lime, dolomite and fluorite with 2-4.2:1-2.5:0.5-1 mass ratio
The mixture of composition.
Further, the grain refiner is Al-Ti-B systems grain refiner.
Further, the tensile strength of the 42CrMo：2100-2300MPa, elongation percentage：8-14%, hardness：35-
38HRC。
Beneficial effects of the present invention are：Smelting technology step provided by the invention is simple, energy-conserving and environment-protective；Effectively increase molten
The heat utilization ratio of stove, help to save the energy, reduce production cost, it is unexpected that the present invention achieves those skilled in the art
Technique effect, and achieve Smelting Effect more more preferable than prior art.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the implementation of the present invention
Example, the technical scheme in the embodiment of the present invention is clearly and completely described.Based on the embodiment in the present invention, this area
The every other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
Embodiment 1：
The energy-conservation smelting technology of 42CrMo a kind of, comprises the following steps：
(1) by coke, ferrosilicon powder, give up in chromium steel and molybdenum-iron addition intermediate frequency furnace, the pressure for making grate surface is
0.4mmH2O posts；
(2) with 280-350 DEG C/h temperature rise speed, furnace temperature is risen to 1593 DEG C, is incubated 24min；
(3) ferromanganese is put into stove, and with 115 DEG C/h temperature rise speed, furnace temperature is risen to 1853 DEG C；
(4) sample and to adjust element mass percent content as follows：Carbon：0.43wt%, silicon：0.27wt%, manganese：
0.68wt%, chromium：1.2wt%, molybdenum：0.19wt%, surplus are iron and inevitable other elements；
(5) it is 3.7 that mass ratio is put into stove:1.3:0.8 lime, dolomite and fluorite mixture, with 50r/min
Mixing speed agitation molten steel, when in-furnace temperature is down to 1488 DEG C, you can turndown is skimmed；
(5) under the conditions of electromagnetic agitation, Al-Ti-B systems grain refiner is added, obtains fine grain structure；
(6) deoxidization desulfuration：
(7) molten steel calm 3min in bag, when being down to 1415 DEG C to temperature, is poured into a mould, and is obtained tensile strength and is
2200MPa, elongation percentage 11%, hardness are 36HRC 42CrMo.
Embodiment 2：
The energy-conservation smelting technology of 42CrMo a kind of, comprises the following steps：
(1) by coke, ferrosilicon powder, give up in chromium steel and molybdenum-iron addition intermediate frequency furnace, the pressure for making grate surface is
0.3mmH2O posts；
(2) with 350 DEG C/h temperature rise speed, furnace temperature is risen to 1580 DEG C, is incubated 30min；
(3) ferromanganese is put into stove, and with 105 DEG C/h temperature rise speed, furnace temperature is risen to 1860 DEG C；
(4) sample and to adjust element mass percent content as follows：Carbon：0.42wt%, silicon：0.35wt%, manganese：
0.55wt%, chromium：1.3wt%, molybdenum：0.16wt%, surplus are iron and inevitable other elements；
(5) it is 4.2 that mass ratio is put into stove:1:1 lime, dolomite and fluorite mixture, with stirring for 45r/min
Speed agitation molten steel is mixed, when in-furnace temperature is down to 1520 DEG C, you can turndown is skimmed；
(5) under the conditions of electromagnetic agitation, Al-Ti-B systems grain refiner is added, obtains fine grain structure；
(6) deoxidization desulfuration：
(7) molten steel calm 1min in bag, when being down to 1424 DEG C to temperature, is poured into a mould, and is obtained tensile strength and is
2100MPa, elongation percentage 14%, hardness are 35HRC 42CrMo.
Embodiment 3：
The energy-conservation smelting technology of 42CrMo a kind of, comprises the following steps：
(1) by coke, ferrosilicon powder, give up in chromium steel and molybdenum-iron addition intermediate frequency furnace, the pressure for making grate surface is
0.5mmH2O posts；
(2) with 280 DEG C/h temperature rise speed, furnace temperature is risen to 1610 DEG C, is incubated 20min；
(3) ferromanganese is put into stove, and with 130 DEG C/h temperature rise speed, furnace temperature is risen to 1840 DEG C；
(4) sample and to adjust element mass percent content as follows：Carbon：0.46wt%, silicon：0.24wt%, manganese：
0.92wt%, chromium：1.1wt%, molybdenum：0.22wt%, surplus are iron and inevitable other elements；
(5) it is 2 that mass ratio is put into stove:2.5:0.5 lime, dolomite and fluorite mixture, with 60r/min's
Mixing speed stirs molten steel, when in-furnace temperature is down to 1450 DEG C, you can turndown is skimmed；
(5) under the conditions of electromagnetic agitation, Al-Ti-B systems grain refiner is added, obtains fine grain structure；
(6) deoxidization desulfuration：
(7) molten steel calm 4min in bag, when being down to 1395 DEG C to temperature, is poured into a mould, and is obtained tensile strength and is
2300MPa, elongation percentage 8%, hardness are 38HRC 42CrMo.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these modification or
Replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a kind of 42CrMo energy-conservation smelting technology, it is characterised in that comprise the following steps：
(1) by reducing agent, give up in chromium steel and molybdenum-iron addition intermediate frequency furnace, the pressure for making grate surface is 0.3-0.5mmH2O posts；
(2) with 280-350 DEG C/h temperature rise speed, furnace temperature is risen to 1580-1610 DEG C, is incubated 20-30min；
(3) ferromanganese is put into stove, and with 105-130 DEG C/h temperature rise speed, furnace temperature is risen to 1840-1860 DEG C；
(4) sample and adjust constituent content；
(5) slag making materials is put into stove, molten steel is stirred with 45-60r/min mixing speed, when in-furnace temperature is down to 1450-
At 1520 DEG C, you can turndown is skimmed；
(5) under the conditions of electromagnetic agitation, grain refiner is added, obtains fine grain structure；
(6) deoxidization desulfuration：
(7) molten steel calm 1-4min in bag, when being down to 1395-1424 DEG C to temperature, is poured into a mould.
2. 42CrMo as claimed in claim 1 energy-conservation smelting technology, it is characterised in that reducing agent is in the step (1)
The composition of coke and ferrosilicon powder.
3. 42CrMo as claimed in claim 1 energy-conservation smelting technology, it is characterised in that adjustment obtains in the step (4)
Element mass percent be：Carbon：0.42-0.46wt%, silicon：0.24-0.35wt%, manganese：0.55-0.92wt%, chromium：1.1-
1.3wt%, molybdenum：0.16-0.22wt%, surplus are iron and inevitable other elements.
4. 42CrMo as claimed in claim 1 energy-conservation smelting technology, it is characterised in that the slag making materials is lime, in vain
Marble and fluorite are with 2-4.2:1-2.5:The mixture of 0.5-1 mass ratio composition.
5. 42CrMo as claimed in claim 1 energy-conservation smelting technology, it is characterised in that the grain refiner is Al-Ti-
B systems grain refiner.
6. 42CrMo as claimed in claim 1 energy-conservation smelting technology, it is characterised in that the tensile strength of the 42CrMo：
2100-2300MPa, elongation percentage：8-14%, hardness：35-38HRC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610708342.8A CN106244899B (en) | 2016-08-23 | 2016-08-23 | A kind of energy-conservation smelting technology of 42CrMo |
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| CN201610708342.8A CN106244899B (en) | 2016-08-23 | 2016-08-23 | A kind of energy-conservation smelting technology of 42CrMo |
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| CN106244899B true CN106244899B (en) | 2018-02-23 |
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| CN102409238B (en) * | 2011-06-28 | 2013-04-24 | 南阳汉冶特钢有限公司 | 42CrMo alloy constructional steel super-thick plate and production method thereof |
| CN105648301A (en) * | 2014-11-14 | 2016-06-08 | 重庆春顾机械制造有限公司 | 42CrMo melting process |
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Address after: 242300 Fancun Road, heli Park, Ningguo Economic and Technological Development Zone, Xuancheng City, Anhui Province Patentee after: Ningguo Kaiyuan Electric POWER WEAR Resistant MATERIALS Co.,Ltd. Address before: 242300 Heli Industrial Concentration Zone, Ningguo Economic and Technological Development Zone, Xuancheng, Anhui Province Patentee before: NINGGUO KAIYUAN ELECTRIC POWER WEAR RESISTANT MATERIALS Co.,Ltd. |
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