CN107236903A - A kind of casting technique of alloy steel casting - Google Patents
A kind of casting technique of alloy steel casting Download PDFInfo
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- CN107236903A CN107236903A CN201710510201.XA CN201710510201A CN107236903A CN 107236903 A CN107236903 A CN 107236903A CN 201710510201 A CN201710510201 A CN 201710510201A CN 107236903 A CN107236903 A CN 107236903A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of casting technique of alloy steel casting, it is related to steel alloy casting field, comprises the following steps：1) first take oxide or raw material simple substance to be placed in smelting furnace to smelt, molten steel mother liquor is made, the outer blowing argon gas of stove are carried out after coming out of the stove, the content of chemical composition in silk refining, control molten steel mother liquor is fed；2) molten steel mother liquor is poured into a mould again；3) casting wants Quick pouring, avoids being mingled with using bottom bottom pour ladle and is involved in, after casting complete alloy steel casting semi-finished product；4) finally by after the annealed heat treatment of alloy steel casting semi-finished product.The problems such as this kind of casting technique solves high manganese steel casting coarse grains, loose, micro-crack, has produced the high alloy steel casting of crystal grain refinement, intensity, further improves the physicochemical property for enhancing alloy steel casting.
Description
Technical field
The present invention relates to steel alloy casting field, and in particular to a kind of casting technique of alloy steel casting.
Background technology
Current alloy steel casting application field is quite varied, is related to automobile making, space flight and aviation, building decoration etc.,
Especially especially prominent in terms of mine with railway, consumption is maximum.However, alloy steel casting coarse grains have had a strong impact on alloy
The performance of steel.Alloy steel casting coarse grains, make field trash and low melting point in casting are enriched with crystal boundary, drop
Low casting strength, causes alloy steel casting to produce the defects such as peeling, crackle in use, has a strong impact on the use of casting
Life-span.Railroad frog is alloy steel casting, and grain refining technology is particularly important for steel alloy railroad frog.Past is due to railway rut
Coarse grains are pitched, a large amount of field trashes and low melting point is gathered on crystal boundary, weakens grain-boundary strength, using steel alloy
During occur heel and toe wear, the problems such as occurring peeling off chip off-falling.
China completes 24% transport total amount with the operation mileage of world's railway 6% so that railway is in extremely busy shape
State, adds the damaged probability of railway, makes railroad frog consumption very big, and the railroad frog requirement in the annual whole nation is about 5
Ten thousand or so, and this numeral also to increase with the increase of trunk railway.Therefore, the chemical composition content of steel alloy and its
Casting technique is urgently improved.
The content of the invention
For problems of the prior art, the invention provides a kind of casting technique of alloy steel casting, this kind casting
The problems such as technique solves high manganese steel casting coarse grains, loose, micro-crack is made, the high conjunction of crystal grain refinement, intensity has been produced
Golden steel casting, further improves the physicochemical property for enhancing alloy steel casting.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of casting technique of alloy steel casting, is followed the steps below：
(1) first take oxide or raw material simple substance to be placed in smelting furnace to smelt, molten steel mother liquor is made, carry out blowing outside stove after coming out of the stove
Argon gas, the content for feeding chemical composition in silk refining, control molten steel mother liquor；
The molten steel mother liquor includes following chemical composition by weight percentage：C 0.18~0.36%, Si 0.21~
0.37%th, Mn 0.68~0.94%, Ni 0.27~0.45%, Al 0.12~0.30%, S≤0.008%, P≤0.006%,
Surplus is Fe and inevitable impurity.
(2) molten steel mother liquor is made to step (1) again be poured into mould, the pre-heat treatment is carried out to mould before cast,
Preheating temperature is 860-920 DEG C；
(3) casting wants Quick pouring, avoids being mingled with using bottom bottom pour ladle and is involved in, and after casting complete, casting mold is air-cooled into 480-
520 DEG C, obtain alloy steel casting semi-finished product；
(4) finally by after the annealed heat treatment of alloy steel casting semi-finished product.
Further, in step (1), the molten steel mother liquor tapping temperature is 1480-1520 DEG C.
Further, in step (1), the argon pressure is 0.3~0.6MPa, and pressure pipeline internal diameter argon blowing time is
45-55s/t molten steel mother liquors, it is the 1~2% of pour steel weight to feed silk amount.
Further, in step (1), the molten steel mother liquor includes following chemical composition by weight percentage：C
0.21~0.33%, Si 0.24~0.34%, Mn 0.72~0.90%, Ni 0.32~0.40%, Al 0.15~0.27%,
S≤0.006%, P≤0.004%, surplus are Fe and inevitable impurity.
Further, the molten steel mother liquor includes following chemical composition by weight percentage：C 0.27%, Si
0.29%th, Mn 0.81%, Ni 0.36%, Al 0.21%, S 0.005%, P 0.003%, surplus are Fe and inevitable
Impurity.
Further, in step (2), the pouring temperature of the molten steel mother liquor is 1280-1360 DEG C, and poring rate is
10kg/s~20kg/s, and with stream addition straight carbon steel or potassium steel metallic particles in casting process.
Further, the addition of the metallic particles is the 4~8% of pour steel weight.
Further, the metallic particles is added from the running gate system of casting with molten steel mother liquor, the metallic particles addition time
For the 1/3~1/2 of the casting pouring time.
Further, in step (4), the annealing is that casting first is heated into 540-580 DEG C, is incubated 20-
30min；640-720 DEG C is again heated to, 30-40min is incubated；Finally heated to 760-840 DEG C, it is incubated 35-45min.
The present invention has following beneficial effect：
(1) casting technique of alloy steel casting of the invention is scientific and reasonable, simple and convenient, significantly shortens steel alloy casting
Part setting time, reduces the production cycle of casting, improves production efficiency；
(2) the alloy steel casting intensity height produced by the casting technique of the present invention, impact flexibility is good, corrosion-resistant resistance to
High temperature, mechanical property is greatly enhanced, after testing its σ s >=960MPa, σ b >=880MPa, ak >=350J/cm2, δ >=48%；
(3) present invention reduces the temperature of molten metal by adding metallic particles in casting process, and increase equiax crystal is thin
Change crystal grain, rapid solidification casting has significantly refined the crystal grain of alloy steel casting, while reducing inclusion size, significantly improve
Casting quality.
Embodiment
The embodiment of the present invention is further described with reference to embodiment, following examples are only used for more
Technical scheme is clearly demonstrated, and can not be limited the scope of the invention with this.
Embodiment 1
A kind of casting technique of alloy steel casting, is followed the steps below：
(1) take the oxides such as iron, silicon, manganese, nickel to be placed in smelting furnace to smelt, molten steel mother liquor is made, molten steel mother liquor temperature is treated
Come out of the stove for 1480 DEG C, the outer blowing argon gas of stove are first carried out after coming out of the stove, its pressure is set as 0.3MPa, and pressure pipeline internal diameter argon blowing time
For 45s/t molten steel mother liquors, then the refining of hello silk, it is the 1% of pour steel weight to feed silk amount, and controls chemical composition in molten steel mother liquor
Content；
The molten steel mother liquor includes following chemical composition by weight percentage：C 0.18%, Si 0.21%, Mn
0.68%th, Ni 0.27%, Al 0.12%, S 0.008%, P 0.006%, surplus are Fe and inevitable impurity.
(2) molten steel mother liquor is made to step (1) again be poured into mould, the pre-heat treatment is carried out to mould before cast,
Preheating temperature is 860 DEG C, and wherein pouring temperature is 1280 DEG C, and poring rate is 10kg/s, and is added in casting process with stream
Straight carbon steel metallic particles, the addition of the metallic particles is the 4% of pour steel weight, and the metallic particles is from the cast of casting
System is added with molten steel mother liquor, and the metallic particles addition time is the 1/3 of the casting pouring time；
(3) casting wants Quick pouring, avoids being mingled with using bottom bottom pour ladle and is involved in, and after casting complete, casting mold is air-cooled into 480
DEG C, obtain alloy steel casting semi-finished product；
(4) founder that alloy steel casting of the present invention finally will be completed after the annealed heat treatment of alloy steel casting semi-finished product
Skill, wherein, annealing is comprised the concrete steps that first is heated to 540 DEG C by casting, is incubated 20min；It is again heated to 640 DEG C, insulation
30min；Finally heated to 760 DEG C, it is incubated 35min.
Embodiment 2
A kind of casting technique of alloy steel casting, is followed the steps below：
(1) take the raw material simple substance such as iron, silicon, manganese, nickel to be placed in smelting furnace to smelt, molten steel mother liquor is made, molten steel mother liquor temperature is treated
Spend and come out of the stove for 1490 DEG C, the outer blowing argon gas of stove are first carried out after coming out of the stove, its pressure is set as 0.4MPa, and during pressure pipeline internal diameter Argon
Between be 48s/t molten steel mother liquors, then feed silk refining, feed that silk amount is pour steel weight 1.2%, and controlling in molten steel mother liquor chemical
The content of composition；
The molten steel mother liquor includes following chemical composition by weight percentage：C 0.21%, Si 0.24%, Mn
0.72%th, Ni 0.32%, Al 0.15%, S 0.006%, P 0.004%, surplus are Fe and inevitable impurity.
(2) molten steel mother liquor is made to step (1) again be poured into mould, the pre-heat treatment is carried out to mould before cast,
Preheating temperature is 870 DEG C, and wherein pouring temperature is 1290 DEG C, and poring rate is 12kg/s, and is added in casting process with stream
Potassium steel metallic particles, the addition of the metallic particles is the 5% of pour steel weight, and the metallic particles is from the cast of casting
System is added with molten steel mother liquor, and the metallic particles addition time is the 1/3 of the casting pouring time；
(3) casting wants Quick pouring, avoids being mingled with using bottom bottom pour ladle and is involved in, and after casting complete, casting mold is air-cooled into 490
DEG C, obtain alloy steel casting semi-finished product；
(4) founder that alloy steel casting of the present invention finally will be completed after the annealed heat treatment of alloy steel casting semi-finished product
Skill, wherein, annealing is comprised the concrete steps that first is heated to 550 DEG C by casting, is incubated 22min；It is again heated to 660 DEG C, insulation
32min；Finally heated to 780 DEG C, it is incubated 38min.
Embodiment 3
A kind of casting technique of alloy steel casting, is followed the steps below：
(1) take the oxides such as iron, silicon, manganese, nickel to be placed in smelting furnace to smelt, molten steel mother liquor is made, molten steel mother liquor temperature is treated
Come out of the stove for 1500 DEG C, the outer blowing argon gas of stove are first carried out after coming out of the stove, its pressure is set as 0.4MPa, and pressure pipeline internal diameter argon blowing time
For 50s/t molten steel mother liquors, then feed silk refining, feed that silk amount is pour steel weight 1.5%, and control in molten steel mother liquor chemistry into
The content divided；
The molten steel mother liquor includes following chemical composition by weight percentage：C 0.27%, Si 0.29%, Mn
0.81%th, Ni 0.36%, Al 0.21%, S 0.005%, P 0.003%, surplus are Fe and inevitable impurity.
(2) molten steel mother liquor is made to step (1) again be poured into mould, the pre-heat treatment is carried out to mould before cast,
Preheating temperature is 890 DEG C, and wherein pouring temperature is 1320 DEG C, and poring rate is 15kg/s, and is added in casting process with stream
Straight carbon steel metallic particles, the addition of the metallic particles is the 6% of pour steel weight, and the metallic particles is from the cast of casting
System is added with molten steel mother liquor, and the metallic particles addition time is the 1/2 of the casting pouring time；
(3) casting wants Quick pouring, avoids being mingled with using bottom bottom pour ladle and is involved in, and after casting complete, casting mold is air-cooled into 500
DEG C, obtain alloy steel casting semi-finished product；
(4) founder that alloy steel casting of the present invention finally will be completed after the annealed heat treatment of alloy steel casting semi-finished product
Skill, wherein, annealing is comprised the concrete steps that first is heated to 560 DEG C by casting, is incubated 25min；It is again heated to 680 DEG C, insulation
35min；Finally heated to 800 DEG C, it is incubated 40min.
Embodiment 4
A kind of casting technique of alloy steel casting, is followed the steps below：
(1) take the raw material simple substance such as iron, silicon, manganese, nickel to be placed in smelting furnace to smelt, molten steel mother liquor is made, molten steel mother liquor temperature is treated
Spend and come out of the stove for 1510 DEG C, the outer blowing argon gas of stove are first carried out after coming out of the stove, its pressure is set as 0.5MPa, and during pressure pipeline internal diameter Argon
Between be 52s/t molten steel mother liquors, then feed silk refining, feed that silk amount is pour steel weight 1.8%, and controlling in molten steel mother liquor chemical
The content of composition；
The molten steel mother liquor includes following chemical composition by weight percentage：C 0.33%, Si 0.34%, Mn
0.90%th, Ni 0.40%, Al 0.27%, S 0.006%, P 0.004%, surplus are Fe and inevitable impurity.
(2) molten steel mother liquor is made to step (1) again be poured into mould, the pre-heat treatment is carried out to mould before cast,
Preheating temperature is 900 DEG C, and wherein pouring temperature is 1340 DEG C, and poring rate is 18kg/s, and is added in casting process with stream
Potassium steel metallic particles, the addition of the metallic particles is the 7% of pour steel weight, and the metallic particles is from the cast of casting
System is added with molten steel mother liquor, and the metallic particles addition time is the 1/2 of the casting pouring time；
(3) casting wants Quick pouring, avoids being mingled with using bottom bottom pour ladle and is involved in, and after casting complete, casting mold is air-cooled into 510
DEG C, obtain alloy steel casting semi-finished product；
(4) founder that alloy steel casting of the present invention finally will be completed after the annealed heat treatment of alloy steel casting semi-finished product
Skill, wherein, annealing is comprised the concrete steps that first is heated to 570 DEG C by casting, is incubated 28min；It is again heated to 700 DEG C, insulation
38min；Finally heated to 820 DEG C, it is incubated 42min.
Embodiment 5
A kind of casting technique of alloy steel casting, is followed the steps below：
(1) take the oxides such as iron, silicon, manganese, nickel to be placed in smelting furnace to smelt, molten steel mother liquor is made, molten steel mother liquor temperature is treated
Come out of the stove for 1520 DEG C, the outer blowing argon gas of stove are first carried out after coming out of the stove, its pressure is set as 0.6MPa, and pressure pipeline internal diameter argon blowing time
For 55s/t molten steel mother liquors, then the refining of hello silk, it is the 2% of pour steel weight to feed silk amount, and controls chemical composition in molten steel mother liquor
Content；
The molten steel mother liquor includes following chemical composition by weight percentage：C 0.36%, Si 0.37%, Mn
0.94%th, Ni 0.45%, Al 0.30%, S 0.008%, P 0.006%, surplus are Fe and inevitable impurity.
(2) molten steel mother liquor is made to step (1) again be poured into mould, the pre-heat treatment is carried out to mould before cast,
Preheating temperature is 920 DEG C, and wherein pouring temperature is 1360 DEG C, and poring rate is 20kg/s, and is added in casting process with stream
Straight carbon steel metallic particles, the addition of the metallic particles is the 8% of pour steel weight, and the metallic particles is from the cast of casting
System is added with molten steel mother liquor, and the metallic particles addition time is the 1/2 of the casting pouring time；
(3) casting wants Quick pouring, avoids being mingled with using bottom bottom pour ladle and is involved in, and after casting complete, casting mold is air-cooled into 520
DEG C, obtain alloy steel casting semi-finished product；
(4) founder that alloy steel casting of the present invention finally will be completed after the annealed heat treatment of alloy steel casting semi-finished product
Skill, wherein, annealing is comprised the concrete steps that first is heated to 580 DEG C by casting, is incubated 30min；It is again heated to 720 DEG C, insulation
40min；Finally heated to 840 DEG C, it is incubated 45min.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention is described in detail, for those skilled in the art, 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.All essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (9)
1. a kind of casting technique of alloy steel casting, it is characterised in that comprise the following steps：
(1) first take oxide or raw material simple substance to be placed in smelting furnace to smelt, molten steel mother liquor is made, the outer Argon of stove is carried out after coming out of the stove
Gas, the content for feeding chemical composition in silk refining, control molten steel mother liquor；
The molten steel mother liquor includes following chemical composition by weight percentage：C 0.18~0.36%, Si 0.21~
0.37%th, Mn 0.68~0.94%, Ni 0.27~0.45%, Al 0.12~0.30%, S≤0.008%, P≤0.006%,
Surplus is Fe and inevitable impurity；
(2) molten steel mother liquor is made to step (1) again be poured into mould, carries out the pre-heat treatment, preheating before cast to mould
Temperature is 860-920 DEG C；
(3) casting wants Quick pouring, avoids being mingled with using bottom bottom pour ladle and is involved in, and after casting complete, casting mold is air-cooled into 480-520
DEG C, obtain alloy steel casting semi-finished product；
(4) finally by after the annealed heat treatment of alloy steel casting semi-finished product.
2. the casting technique of a kind of alloy steel casting according to claim 1, it is characterised in that described in step (1)
Molten steel mother liquor tapping temperature is 1480-1520 DEG C.
3. the casting technique of a kind of alloy steel casting according to claim 1, it is characterised in that described in step (1)
Argon pressure is 0.3~0.6MPa, and pressure pipeline internal diameter argon blowing time is 45-55s/t molten steel mother liquors, and it is pour steel to feed silk amount
The 1~2% of weight.
4. the casting technique of a kind of alloy steel casting according to claim 1, it is characterised in that described in step (1)
Molten steel mother liquor includes following chemical composition by weight percentage：C 0.21~0.33%, Si 0.24~0.34%, Mn 0.72
~0.90%, Ni 0.32~0.40%, Al 0.15~0.27%, S≤0.006%, P≤0.004%, surplus are Fe and can not
The impurity avoided.
5. the casting technique of a kind of alloy steel casting according to claim 4, it is characterised in that the molten steel mother liquor is by weight
Measuring percentages includes following chemical composition：C 0.27%, Si 0.29%, Mn 0.81%, Ni 0.36%, Al 0.21%, S
0.005%th, P 0.003%, surplus is Fe and inevitable impurity.
6. the casting technique of a kind of alloy steel casting according to claim 1, it is characterised in that described in step (2)
The pouring temperature of molten steel mother liquor is 1280-1360 DEG C, and poring rate is 10kg/s~20kg/s, and is added in casting process with stream
Plus straight carbon steel or potassium steel metallic particles.
7. a kind of casting technique of alloy steel casting according to claim 6, it is characterised in that the metallic particles adds
Dosage is the 4~8% of pour steel weight.
8. a kind of casting technique of alloy steel casting according to claim 7, it is characterised in that the metallic particles is from casting
The running gate system of part is added with molten steel mother liquor, and the metallic particles addition time is the 1/3~1/2 of the casting pouring time.
9. the casting technique of a kind of alloy steel casting according to claim 1, it is characterised in that described in step (4)
Annealing is that casting first is heated into 540-580 DEG C, is incubated 20-30min；640-720 DEG C is again heated to, 30- is incubated
40min；Finally heated to 760-840 DEG C, it is incubated 35-45min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518095A (en) * | 2019-01-03 | 2019-03-26 | 南京钢铁股份有限公司 | A kind of wide and thick slab and the production method for improving center portion segregation |
| CN110038988A (en) * | 2019-03-14 | 2019-07-23 | 桂林理工大学 | A kind of medium carbon alloy steel hard disk shell precision forging forming method |
| CN114785073A (en) * | 2022-05-23 | 2022-07-22 | 东莞市巨晟电器有限公司 | Edge-rolling motor shell |
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| CN110038988A (en) * | 2019-03-14 | 2019-07-23 | 桂林理工大学 | A kind of medium carbon alloy steel hard disk shell precision forging forming method |
| CN114785073A (en) * | 2022-05-23 | 2022-07-22 | 东莞市巨晟电器有限公司 | Edge-rolling motor shell |
| CN114785073B (en) * | 2022-05-23 | 2024-03-12 | 东莞市巨晟电器有限公司 | Rolling motor shell |
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Application publication date: 20171010 |