CN102363869B - Manufacturing method of free-cutting ferritic stainless steel 430FM - Google Patents
Manufacturing method of free-cutting ferritic stainless steel 430FM Download PDFInfo
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Abstract
The invention provides a manufacturing method of free-cutting ferritic stainless steel 430FM. The method comprises steps that: molten steel is pre-smelted by using an electric arc furnace; and the molten steel is refined in a ladle refining furnace and a vacuum oxygen decarburization refining furnace, such that steel is obtained. The steel comprises, by weight: 0.10-0.16w% of C, no more than 1.30w% of Mn, no more than 1.00% of Si, no more than 0.060% of P, more than 0.150% of S, 15.00-17.00% of Cr, no more than 0.60% of Ni, 0.20-0.60%of Mo, 0.0005-0.0030% of Ca, 0.0010-0.0060% of rare earth element, and balance of Fe and inevitable impurities. The ratio of the Mn content and the S content is no smaller than 4.
Description
Technical field
The present invention relates to a kind of free-cutting ferritic stainless steel and manufacture method thereof.
Background technology
In recent years, along with the fast development of the development of mechanical industry, particularly Coal Mechanical and automotive industry, in order raising labour productivity, high-speed automated machining to have occurred, therefore the demand of free cutting stainless steel to have been increased day by day.In order to improve the free cutting property of steel, free-cutting ferritic stainless steel 430FM on the basis of 1Cr17 with steel in sulphur content bring up to more than 0.15%, add simultaneously the Mo of 0.20-0.60% in steel.The sulphur content of free-cutting ferritic stainless steel 430FM is higher, and the free cutting property of steel is better, and in steel, sulphur content can reach 0.35%.When the manganese content in the 430FM steel was higher, the sulphur in steel mainly existed with the form of MnS, and the existence of MnS produces stress raiser, can make smear metal be easy to fracture, can automatic chip breaking in working angles, improve the machinability of steel, thereby reach the purpose of high-speed turning component of machine; MnS in steel has lubrication simultaneously, and hardness own is low, can reduce the wearing and tearing to cutter, thereby improves the life-span of turning cutting tool.
The production process of free-cutting ferritic stainless steel 430FM round steel, sheet material can comprise: rolling, the round steel of rolling, the round steel of the smelting of steel, square billet and slab and sheet material and the annealing process of sheet material.There is following shortcoming in this technique:
(1) sulphur content in invar is high, thus in the process of blooming mill cogging the end end to end of steel cracking (or claiming straight on the head), when straight on the head serious, cause whole steel ingot (weight can be 3.0 tons) to be scrapped.At the initial stage of research and development 430FM round steel, sheet material, billet yield is only 75%, than normal billet yield 85% low 10%.
(2) in 430FM round steel, plate rolling process, invar straight on the head gets lodged in middle milling train and finishing mill place, causes whole blank to scrap.Just begun examination when rolling 430FM round steel, sheet material, base material rate is only 67%, than normal base material rate 93% low 26%.
In the research and development of 430FM round steel, sheet material, in invar, sulphur content is high, so in the operation of rolling of steel, the billet yield that straight on the head causes steel of steel and base material rate are all lower, thereby making the ingot rate (steel ingot is to the lumber recovery of material) of steel is only 50%, than normal ingot rate 79% low 29%, increased considerably like this cost of steel.
Summary of the invention
One object of the present invention is to provide the manufacture method of the free-cutting ferritic stainless steel of at least one technical problem in a kind of can solving the problems of the technologies described above.
Another object of the present invention is to provide the free-cutting ferritic stainless steel of at least one technical problem in a kind of can solving the problems of the technologies described above.
comprise the steps: to adopt electric arc furnace just to make steel water according to the manufacture method of free-cutting ferritic stainless steel of the present invention, then in ladle refining furnace and vacuum oxygen decarburization refining furnace, molten steel is carried out refining, thereby acquisition steel, described ladle contains the C of 0.10-0.16wt%, be no more than the Mn of 1.30wt%, be no more than the Si of 1.00wt%, be no more than the P of 0.060wt%, the S that 0.150wt% is above, the Cr of 15.00-17.00wt%, be no more than the Ni of 0.60wt%, the Mo of 0.20-0.60wt%, the Ca of 0.0005-0.0030wt%, the rare earth element of 0.0010-0.0060wt%, the iron of surplus and inevitable impurity, and Mn content wherein is not less than 4 with the ratio of S content.
According to an aspect of the present invention, described ladle contains Cr, the Mo of 0.25-0.35wt% of S, 15.40-15.80wt% of Si, the P that is no more than 0.045wt%, 0.18-0.25wt% of Mn, 0.20-0.50wt% of C, the 1.10-1.30wt% of 0.13-0.16wt%.
According to an aspect of the present invention, described ladle contains the C of 0.13-0.16wt% and the Mn of 1.10-1.30wt%.
According to an aspect of the present invention, in vacuum oxygen decarburization refining furnace, molten steel is carried out in the step of refining, the time of pure Argon is no less than 10 minutes.
According to an aspect of the present invention, described manufacture method also comprises: with described the steel side's of pouring into ingot or slab ingot under the temperature of 1550-1570 ℃ and argon shield.
According to an aspect of the present invention, described manufacture method also comprises: at the temperature of 1100-1180 ℃, square ingot or slab ingot are rolled into square billet or slab through blooming mill, in the process that is rolled into square billet or slab, the cooling water inflow of blooming mill are reduced to the minimum value of permission.
According to an aspect of the present invention, described manufacture method also comprises: make square billet enter the bar continuous rolling unit at the temperature of 1100-1180 ℃ and be rolled, in the operation of rolling, the roughing mill of tandem rolling unit, middle milling train, finishing mill water coolant are closed the minimum that allows, the length end to end of simultaneously No. three flying shears being cut increases to 1.5 times-3 times of the length end to end cut in the situation of carbon alloy structure iron, then make steel billet enter finishing mill, make round steel; Perhaps make slab enter plate mill at the temperature of 1100-1180 ℃ and be rolled, make sheet material, in the operation of rolling, two rollers of plate mill, the water coolant of four rollers are closed the minimum that allows.
According to an aspect of the present invention, described manufacture method also comprises: round steel or sheet material are incubated 8-10 hour at 850 ± 10 ℃, then air cooling.
Free-cutting ferritic stainless steel according to the present invention comprises iron and the inevitable impurity of rare earth element, surplus of Ca, 0.0010-0.0060wt% of Mo, the 0.0005-0.0030wt% of the C of 0.10-0.16wt%, the Mn that is no more than 1.30wt%, the Si that is no more than 1.00wt%, the Cr that is no more than the P of 0.060wt%, the S more than 0.150wt%, 15.00-17.00wt%, the Ni that is no more than 0.60wt%, 0.20-0.60wt%, and the ratio of Mn content wherein and S content is not less than 4.
Embodiment
The invention will be further described for detailed description plan given below; but can not be interpreted as it is limiting the scope of the invention, within some non-intrinsically safes that those skilled in the art's spirit according to the present invention is made the present invention improve and adjust and still fall into protection scope of the present invention.
For the problem that occurs in the process that solves above-mentioned rolling free-cutting ferritic stainless steel, the present inventor found out free-cutting ferritic stainless in the operation of rolling straight on the head reason be at least one in following:
(1) when Mn content in free-cutting ferritic stainless steel is low, it is the MnS of 1610 ℃ that Mn can not fully generate fusing point with S, and part S is just take fusing point as the FeS of 1190 ℃ or exist take fusing point as the eutectiferous form of the FeS-FeO of 940 ℃.Because the eutectiferous fusing point of FeS or FeS-FeO is low, so under hot processing temperature, this class sulfide will form liquid phase at grain boundaries, causes breaking along crystal boundary, cause the generation of hot-short phenomenon, namely show as the tail end of steel straight on the head in the free-cutting ferritic stainless steel operation of rolling.
(2) free-cutting ferritic stainless steel MnS in the operation of rolling is easy to be stretched along rolling direction, and the sulfide of long strip shape obviously reduces the lateral performance of steel, and particularly the high-temp plastic of steel reduces more significantly, and when therefore rolling, easily cracking is straight on the head.
(3) in the process of free-cutting ferritic stainless steel cogging or stocking, the temperature of the head-tail of steel is on the low side, easily causes the cracking of steel straight on the head.
Comprise rolling, round steel or the rolling and round steel of sheet material or the annealing of sheet material of smelting, square billet or the slab of steel according to the manufacture method of free-cutting ferritic stainless steel of the present invention.
in the step of the smelting of steel, adopt just steel-making water of electric arc furnace (for example 40t electric arc furnace), then in ladle refining furnace (LF) (for example 40t LF) and vacuum-oxygen decarbonizing (VOD) refining furnace (for example 40t VOD refining furnace), molten steel is carried out refining, thereby acquisition steel, described ladle contains the C of 0.10-0.16wt%, be no more than the Mn of 1.30wt%, be no more than the Si of 1.00wt%, be no more than the P of 0.060wt%, the S that 0.150wt% is above, the Cr of 15.00-17.00wt%, be no more than the Ni of 0.60wt%, the Mo of 0.20-0.60wt%, the Ca of 0.0005-0.0030wt%, the rare earth element of 0.0010-0.0060wt%, the iron of surplus and inevitable impurity, and Mn content wherein is not less than 4 with the ratio of S content.According to one embodiment of present invention, in the VOD refining furnace, molten steel is carried out in the step of refining, the time of pure Argon is no less than 10 minutes, and the pure argon blowing time here can refer to add in the VOD refining furnace after all alloys to this section argon blowing time of watering before steel.According to one embodiment of present invention, can in the later stage of VOD refining furnace refining, Ca and rare earth element be added molten steel.
In one embodiment of the invention, preferably, described ladle contains the Ca, the rare earth element of 0.0010-0.0060wt% of Mo, 0.0005-0.0030wt% of Cr, the Ni that is no more than 0.60wt%, 0.25-0.35wt% of S, 15.40-15.80wt% of Si, the P that is no more than 0.045wt%, 0.18-0.25wt% of Mn, 0.20-0.50wt% of C, the 1.10-1.30wt% of 0.13-0.16wt%, and surplus is iron and inevitable impurity.
In one embodiment of the invention, preferably, in described steel, C content is 0.13-0.16wt%, and Mn content is 1.10-1.30wt%.
In obtaining steel according to above-mentioned steps, Mn content is not less than 4 with the ratio of S content, so Mn can fully generate the MnS of fusing point up to 1610 ℃ with S, has avoided FeS or the eutectiferous existence of FeS-FeO of low melting point.Therefore, do not have the sulfide of liquid phase at grain boundaries in follow-up hot procedure, just do not exist along the breaking of crystal boundary yet, avoided the generation of the hot-short phenomenon of S, namely avoided in the steel rolling process tail end straight on the head, improve the ingot rate of steel.
In addition, steel of the present invention contains Ca and the rare earth element of trace, the MnS of long strip shape in steel can be become spherical or fusiform MnS, and spherical or fusiform MnS is mingled with and can be distributed among the matrix of steel small and dispersed, can reduce on the one hand in the operation of rolling straight on the head, can also improve on the other hand the free cutting property of steel.
Then, available bull ladle is accepted molten steel in the stokehold, afterwards bull ladle is transported to casting mold and is in the side's of pouring into ingot or slab ingot (for example, square ingot or the slab ingot of 2.5t-4t) under argon shield, and in bull ladle, the temperature of molten steel is 1550-1570 ℃.Then, in one embodiment, the square ingot that pours into or slab ingot are delivered to the rolling plant of square billet or slab with the temperature that is not less than 500 ℃.Then, at the temperature of 1100-1180 ℃, square ingot or slab ingot are rolled into square billet or slab through blooming mill, for example, specification is the square billet of 150-200mm or the slab of thick 60-120mm, wide 330-630mm.In the process of rolling square billet or slab, the cooling water inflow of blooming mill is reduced to the minimum value of permission.The blooming mill that uses in this step can be 825 first finishing train.
Afterwards, can with after the square billet whole peeling, make square billet enter the bar continuous rolling unit at the temperature of 1100-1180 ℃ and be rolled.In the operation of rolling of round steel, the roughing mill of tandem rolling unit, middle milling train, finishing mill water coolant are closed the minimum that allows, the length end to end of simultaneously No. three flying shears being cut increases to 1.5 times-3 times of the length end to end cut in the situation of carbon alloy structure iron, thereby the head temperature that guarantees steel is higher, in the situation that not straight on the head, enter finishing mill, make round steel.In one embodiment, the round steel that makes can be Φ 20-90mm round steel.
Perhaps, can with after the slab whole peeling, make slab enter plate mill (for example Φ 700mm plate mill) at the temperature of 1100-1180 ℃ and be rolled.Can at first make slab enter edge rolling, carry out the slab de-scaling and process, enter two rolling systems, then enter four rolling systems, make sheet material.In the operation of rolling of sheet material, two rollers of plate mill, the water coolant of four rollers are closed the minimum that allows.In one embodiment, the sheet material that makes can be the sheet material of thick 8-55mm, wide 310-610mm.
Subsequently, round steel or sheet material are carried out annealing, that is, round steel or sheet material are incubated 8-10 hour at 850 ± 10 ℃, then air cooling.
According to an embodiment, after round steel or sheet material annealing, also carry out the finishing check, make round steel or sheet material finished product, the packing warehouse-in.
According to the manufacture method of free-cutting ferritic stainless steel of the present invention, because the straight on the head cracking waste product of steel greatly reduces, the ingot rate of steel can be brought up to by 50% of initial stage of development current 79%, so the cost of round steel, sheet material reduces significantly.
Good according to the key technical indexes such as mechanical property, hardness and free cutting property of free-cutting ferritic stainless steel round steel of the present invention, sheet material, can be used for high speed cutting automaticmachines part manufacture field.
In addition, simple according to the manufacturing approach craft of free-cutting ferritic stainless steel of the present invention, practical.
Illustrate in greater detail manufacture method according to free-cutting ferritic stainless steel of the present invention below in conjunction with concrete example.
Example 1:
Adopt the 40t electric arc furnace just to make steel water, then in 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein, later stage in the refining of VOD refining furnace adds molten steel with Ca and rare earth element), thereby acquisition steel, this ladle contains iron and the inevitable impurity of rare earth element, surplus of Ca, 0.0012wt% of Mo, 0.0009wt% of Ni, 0.25wt% of Cr, 0.10wt% of S, 15.45wt% of P, 0.245wt% of Si, 0.035wt% of Mn, 0.25wt% of C, the 1.11wt% of 0.13wt%, and wherein Mn content is 4.53 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.In bull ladle, liquid steel temperature is 1550-1570 ℃, pouring molten steel is become 3t side's ingot or 3t slab ingot under argon shield.The square ingot that pours into or slab ingot are delivered to the rolling plant of square billet or slab with the temperature that is not less than 500 ℃.
At the temperature of 1100-1180 ℃, use 825 first finishing train that 3t side's ingot or 3t slab ingot are rolled into the square billet of 150-200mm or the slab of thick 60-120mm, wide 330-630mm.In the process of rolling square billet or slab, the cooling water inflow of blooming mill is reduced to the minimum value of permission.
Afterwards, after the square billet whole peeling, make square billet enter the bar continuous rolling unit at the temperature of 1100-1180 ℃ and be rolled.In the operation of rolling of round steel, the roughing mill of continuous mill, middle milling train, finishing mill water coolant are closed the minimum that allows, the 1.5-3 that the length end to end of simultaneously No. three flying shears being cut increases to the length end to end of cutting in the situation of carbon alloy structure iron doubly, thereby the head temperature that guarantees steel is higher, in the situation that not straight on the head, enter finishing mill, make Φ 20-90mm round steel.
Perhaps, after the slab whole peeling, make slab enter Φ 700mm plate mill at the temperature of 1100-1180 ℃.At first make slab enter edge rolling, carry out the slab de-scaling and process, enter two rolling systems, then enter four rolling systems, make the sheet material of thick 8-55mm, wide 310-610mm.In this process, two rollers of plate mill, the water coolant of four rollers are closed the minimum that allows.
Then, with round steel or sheet material 850 ± 10 ℃ of insulations after 8-10 hour, the air cooling of coming out of the stove.
After round steel or sheet material annealing, the finishing check makes round steel or sheet material finished product, the packing warehouse-in.
In this example, there is not tail end straight on the head in rolling process.
The mechanical property of the free-cutting ferritic stainless steel that makes is as follows: yield strength Rp
0.2Be 290-300MPa; Tensile strength Rm is 505-515MPa; Elongation after fracture δ
5Be 32-39%; Relative reduction in area Z is 64-67%; Hardness is 161-166HB.The car bits of the free-cutting ferritic stainless steel that makes are tiny bits shape.This free-cutting ferritic stainless steel that shows that this example makes can be used in high speed cutting automaticmachines part manufacture field.
Example 2:
Adopt the 40t electric arc furnace just to make steel water, then in 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein, later stage in the refining of VOD refining furnace adds molten steel with Ca and rare earth element), thereby acquisition steel, this ladle contains iron and the inevitable impurity of rare earth element, surplus of Ca, 0.0026wt% of Mo, 0.0011wt% of Ni, 0.29wt% of Cr, 0.15wt% of S, 15.52wt% of P, 0.230wt% of Si, 0.038wt% of Mn, 0.28wt% of C, the 1.15wt% of 0.135wt%, and wherein Mn content is 5.00 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.In bull ladle, liquid steel temperature is 1550-1570 ℃, pouring molten steel is become 3t side's ingot or 3t slab ingot under argon shield.The square ingot that pours into or slab ingot are delivered to the rolling plant of square billet or slab with the temperature that is not less than 500 ℃.
At the temperature of 1100-1180 ℃, use 825 first finishing train that 3t side's ingot or 3t slab ingot are rolled into the square billet of 150-200mm or the slab of thick 60-120mm, wide 330-630mm.In the process of rolling square billet or slab, the cooling water inflow of blooming mill is reduced to the minimum value of permission.
Afterwards, after the square billet whole peeling, make square billet enter the bar continuous rolling unit at the temperature of 1100-1180 ℃ and be rolled.In the operation of rolling of round steel, the roughing mill of continuous mill, middle milling train, finishing mill water coolant are closed the minimum that allows, the 1.5-3 that the length end to end of simultaneously No. three flying shears being cut increases to the length end to end of cutting in the situation of carbon alloy structure iron doubly, thereby the head temperature that guarantees steel is higher, in the situation that not straight on the head, enter finishing mill, make Φ 20-90mm round steel.
Perhaps, after the slab whole peeling, make slab enter Φ 700mm plate mill at the temperature of 1100-1180 ℃.At first make slab enter edge rolling, carry out the slab de-scaling and process, enter two rolling systems, then enter four rolling systems, make the sheet material of thick 8-55mm, wide 310-610mm.In this process, two rollers of plate mill, the water coolant of four rollers are closed the minimum that allows.
Then, with round steel or sheet material 850 ± 10 ℃ of insulations after 8-10 hour, the air cooling of coming out of the stove.
After round steel or sheet material annealing, the finishing check makes round steel or sheet material finished product, the packing warehouse-in.
In this example, there is not tail end straight on the head in rolling process.
The mechanical property of the free-cutting ferritic stainless steel that makes is as follows: yield strength Rp
0.2Be 285-310MPa; Tensile strength Rm is 495-505MPa; Elongation after fracture δ
5Be 34-35.5%; Relative reduction in area Z is 65.5-69%; Hardness is 157-160HB.The car bits of the free-cutting ferritic stainless steel that makes are tiny bits shape.This free-cutting ferritic stainless steel that shows that this example makes can be used in high speed cutting automaticmachines part manufacture field.
Example 3:
Adopt the 40t electric arc furnace just to make steel water, then in 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein, later stage in the refining of VOD refining furnace adds molten steel with Ca and rare earth element), thereby acquisition steel, this ladle contains iron and the inevitable impurity of rare earth element, surplus of Ca, 0.0038wt% of Mo, 0.0016wt% of Ni, 0.31wt% of Cr, 0.22wt% of S, 15.55wt% of P, 0.225wt% of Si, 0.041wt% of Mn, 0.30wt% of C, the 1.18wt% of 0.14wt%, and wherein Mn content is 5.24 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.In bull ladle, liquid steel temperature is 1550-1570 ℃, pouring molten steel is become 3t side's ingot or 3t slab ingot under argon shield.The square ingot that pours into or slab ingot are delivered to the rolling plant of square billet or slab with the temperature that is not less than 500 ℃.
At the temperature of 1100-1180 ℃, use 825 first finishing train that 3t side's ingot or 3t slab ingot are rolled into the square billet of 150-200mm or the slab of thick 60-120mm, wide 330-630mm.In the process of rolling square billet or slab, the cooling water inflow of blooming mill is reduced to the minimum value of permission.
Afterwards, after the square billet whole peeling, make square billet enter the bar continuous rolling unit at the temperature of 1100-1180 ℃ and be rolled.In the operation of rolling of round steel, the roughing mill of continuous mill, middle milling train, finishing mill water coolant are closed the minimum that allows, the 1.5-3 that the length end to end of simultaneously No. three flying shears being cut increases to the length end to end of cutting in the situation of carbon alloy structure iron doubly, thereby the head temperature that guarantees steel is higher, in the situation that not straight on the head, enter finishing mill, make Φ 20-90mm round steel.
Perhaps, after the slab whole peeling, make slab enter Φ 700mm plate mill at the temperature of 1100-1180 ℃.At first make slab enter edge rolling, carry out the slab de-scaling and process, enter two rolling systems, then enter four rolling systems, make the sheet material of thick 8-55mm, wide 310-610mm.In this process, two rollers of plate mill, the water coolant of four rollers are closed the minimum that allows.
Then, with round steel or sheet material 850 ± 10 ℃ of insulations after 8-10 hour, the air cooling of coming out of the stove.
After round steel or sheet material annealing, the finishing check makes round steel or sheet material finished product, the packing warehouse-in.
In this example, there is not tail end straight on the head in rolling process.
The mechanical property of the free-cutting ferritic stainless steel that makes is as follows: yield strength Rp
0.2Be 310-320MPa; Tensile strength Rm is 515-520MPa; Elongation after fracture δ
5Be 32.5-33.5%; Relative reduction in area Z is 61.5-63.5%; Hardness is 182-187HB.The car bits of the free-cutting ferritic stainless steel that makes are tiny bits shape.This free-cutting ferritic stainless steel that shows that this example makes can be used in high speed cutting automaticmachines part manufacture field.
Example 4:
Adopt the 40t electric arc furnace just to make steel water, then in 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein, later stage in the refining of VOD refining furnace adds molten steel with Ca and rare earth element), thereby acquisition steel, this ladle contains iron and the inevitable impurity of rare earth element, surplus of Ca, 0.0043wt% of Mo, 0.0025wt% of Ni, 0.34wt% of Cr, 0.28wt% of S, 15.60wt% of P, 0.210wt% of Si, 0.045wt% of Mn, 0.33wt% of C, the 1.21wt% of 0.15wt%, and wherein Mn content is 5.76 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.In bull ladle, liquid steel temperature is 1550-1570 ℃, pouring molten steel is become 3t side's ingot or 3t slab ingot under argon shield.The square ingot that pours into or slab ingot are delivered to the rolling plant of square billet or slab with the temperature that is not less than 500 ℃.
At the temperature of 1100-1180 ℃, use 825 first finishing train that 3t side's ingot or 3t slab ingot are rolled into the square billet of 150-200mm or the slab of thick 60-120mm, wide 330-630mm.In the process of rolling square billet or slab, the cooling water inflow of blooming mill is reduced to the minimum value of permission.
Afterwards, after the square billet whole peeling, make square billet enter the bar continuous rolling unit at the temperature of 1100-1180 ℃ and be rolled.In the operation of rolling of round steel, the roughing mill of continuous mill, middle milling train, finishing mill water coolant are closed the minimum that allows, the 1.5-3 that the length end to end of simultaneously No. three flying shears being cut increases to the length end to end of cutting in the situation of carbon alloy structure iron doubly, thereby the head temperature that guarantees steel is higher, in the situation that not straight on the head, enter finishing mill, make Φ 20-90mm round steel.
Perhaps, after the slab whole peeling, make slab enter Φ 700mm plate mill at the temperature of 1100-1180 ℃.At first make slab enter edge rolling, carry out the slab de-scaling and process, enter two rolling systems, then enter four rolling systems, make the sheet material of thick 8-55mm, wide 310-610mm.In this process, two rollers of plate mill, the water coolant of four rollers are closed the minimum that allows.
Then, with round steel or sheet material 850 ± 10 ℃ of insulations after 8-10 hour, the air cooling of coming out of the stove.
After round steel or sheet material annealing, the finishing check makes round steel or sheet material finished product, the packing warehouse-in.
In this example, there is not tail end straight on the head in rolling process.
The mechanical property of the free-cutting ferritic stainless steel that makes is as follows: yield strength Rp
0.2Be 310-315MPa; Tensile strength Rm is 510-515Mpa; Elongation after fracture δ
5Be 34.5-35.0%; Relative reduction in area Z is 68.5-70.0%; Hardness is 152-164HB.The car bits of the free-cutting ferritic stainless steel that makes are tiny bits shape.This free-cutting ferritic stainless steel that shows that this example makes can be used in high speed cutting automaticmachines part manufacture field.
Example 5:
Adopt the 40t electric arc furnace just to make steel water, then in 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein, later stage in the refining of VOD refining furnace adds molten steel with Ca and rare earth element), thereby acquisition steel, this ladle contains iron and the inevitable impurity of rare earth element, surplus of Ca, 0.0057wt% of Mo, 0.0029wt% of Ni, 0.35wt% of Cr, 0.20wt% of S, 15.79wt% of P, 0.195wt% of Si, 0.025wt% of Mn, 0.39wt% of C, the 1.28wt% of 0.16wt%, and wherein Mn content is 6.56 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.In bull ladle, liquid steel temperature is 1550-1570 ℃, pouring molten steel is become 3t side's ingot or 3t slab ingot under argon shield.The square ingot that pours into or slab ingot are delivered to the rolling plant of square billet or slab with the temperature that is not less than 500 ℃.
At the temperature of 1100-1180 ℃, use 825 first finishing train that 3t side's ingot or 3t slab ingot are rolled into the square billet of 150-200mm or the slab of thick 60-120mm, wide 330-630mm.In the process of rolling square billet or slab, the cooling water inflow of blooming mill is reduced to the minimum value of permission.
Afterwards, after the square billet whole peeling, make square billet enter the bar continuous rolling unit at the temperature of 1100-1180 ℃ and be rolled.In the operation of rolling of round steel, the roughing mill of continuous mill, middle milling train, finishing mill water coolant are closed the minimum that allows, the 1.5-3 that the length end to end of simultaneously No. three flying shears being cut increases to the length end to end of cutting in the situation of carbon alloy structure iron doubly, thereby the head temperature that guarantees steel is higher, in the situation that not straight on the head, enter finishing mill, make Φ 20-90mm round steel.
Perhaps, after the slab whole peeling, make slab enter Φ 700mm plate mill at the temperature of 1100-1180 ℃.At first make slab enter edge rolling, carry out the slab de-scaling and process, enter two rolling systems, then enter four rolling systems, make the sheet material of thick 8-55mm, wide 310-610mm.In this process, two rollers of plate mill, the water coolant of four rollers are closed the minimum that allows.
Then, with round steel or sheet material 850 ± 10 ℃ of insulations after 8-10 hour, the air cooling of coming out of the stove.
After round steel or sheet material annealing, the finishing check makes round steel or sheet material finished product, the packing warehouse-in.
In this example, there is not tail end straight on the head in rolling process.
The mechanical property of the free-cutting ferritic stainless steel that makes is as follows: yield strength Rp
0.2Be 270-275MPa; Tensile strength Rm is 470-480MPa; Elongation after fracture δ
5Be 38.5-39.5%; Relative reduction in area Z is 68.0-69.0%; Hardness is 143-149HB.The car bits of the free-cutting ferritic stainless steel that makes are tiny bits shape.This free-cutting ferritic stainless steel that shows that this example makes can be used in high speed cutting automaticmachines part manufacture field.
Claims (4)
1. the manufacture method of a free-cutting ferritic stainless steel, comprise the steps:
adopt electric arc furnace just to make steel water, then in ladle refining furnace and vacuum oxygen decarburization refining furnace, molten steel is carried out refining, thereby acquisition steel, described ladle contains the C of 0.10-0.16wt%, be no more than the Mn of 1.30wt%, be no more than the Si of 1.00wt%, be no more than the P of 0.060wt%, the S that 0.150wt% is above, the Cr of 15.00-17.00wt%, be no more than the Ni of 0.60wt%, the Mo of 0.20-0.60wt%, the Ca of 0.0005-0.0030wt%, the rare earth element of 0.0010-0.0060wt%, the iron of surplus and inevitable impurity, and Mn content wherein is not less than 4 with the ratio of S content,
Described steel is poured into slab ingot under the temperature of 1550-1570 ℃ and argon shield;
At the temperature of 1100-1180 ℃, slab ingot is rolled into slab through blooming mill, in being rolled into the process of slab, the cooling water inflow of blooming mill is reduced to the minimum value of permission;
Make slab enter plate mill at the temperature of 1100-1180 ℃ and be rolled, make sheet material, in the operation of rolling, two rollers of plate mill, the water coolant of four rollers are closed the minimum that allows;
Sheet material is incubated 8-10 hour at 850 ± 10 ℃, then air cooling.
2. the manufacture method of free-cutting ferritic stainless steel according to claim 1, wherein, described ladle contains Cr, the Mo of 0.25-0.35wt% of S, 15.40-15.80wt% of Si, the P that is no more than 0.045wt%, 0.18-0.25wt% of Mn, 0.20-0.50wt% of C, the 1.10-1.30wt% of 0.13-0.16wt%.
3. the manufacture method of free-cutting ferritic stainless steel according to claim 1, wherein, described ladle contains the C of 0.13-0.16wt% and the Mn of 1.10-1.30wt%.
4. the manufacture method of free-cutting ferritic stainless steel according to claim 1, wherein, carry out in the step of refining molten steel in vacuum oxygen decarburization refining furnace, and the time of pure Argon is no less than 10 minutes.
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| CN104438418B (en) * | 2014-09-28 | 2017-01-25 | 浙江富钢金属制品有限公司 | Rolling method of stainless steel mold cast steel ingot by one-heating forming |
| CN104962800B (en) * | 2015-07-03 | 2017-01-25 | 共享铸钢有限公司 | Smelting method for stainless steel material |
| CN106591742A (en) * | 2016-11-25 | 2017-04-26 | 邢台钢铁有限责任公司 | High-carbon, sulfur-containing and easy-cutting type ferritic stainless steel and production method thereof |
| CN107723597A (en) * | 2017-10-18 | 2018-02-23 | 启东市荣盛铜业有限公司 | A kind of ball pen head leadless environment-friendly free cutting stainless steel material and its smelting process |
| CN109482656A (en) * | 2018-10-26 | 2019-03-19 | 成都先进金属材料产业技术研究院有限公司 | The rolling-cogging production method of 416 free cutting stainless steels |
| CN110387509A (en) * | 2019-08-22 | 2019-10-29 | 苏州市施强医疗器械有限公司 | A kind of blank material and its production technology for operating scissors |
| CN110669901A (en) * | 2019-10-25 | 2020-01-10 | 攀钢集团江油长城特殊钢有限公司 | Smelting method of sulfur-containing free-cutting stainless steel in electric arc furnace |
| CN110819913B (en) * | 2019-11-27 | 2020-12-04 | 攀钢集团江油长城特殊钢有限公司 | Chalcogenide free-cutting stainless steel and preparation method thereof |
| CN112063923B (en) * | 2020-09-07 | 2022-03-22 | 成都先进金属材料产业技术研究院股份有限公司 | 1300 MPa-grade RE-containing chalcogenide free-cutting steel 60mm bar and preparation method thereof |
| CN113584411B (en) * | 2021-07-30 | 2022-03-18 | 大冶特殊钢有限公司 | Sulfur-containing ferritic stainless steel and manufacturing method thereof |
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