CN102363869A - 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 method of manufacture thereof.
Background technology
In recent years, along with the development of mechanical industry, particularly Coal Mechanical and rapid development of automobile industry, in order to raise labour productivity, high-speed automated cut occurred, therefore the increasing demand to free cutting stainless steel increases.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 the Mo of 0.20-0.60% simultaneously in the steel.The sulphur content of free-cutting ferritic stainless steel 430FM is high more, and the free cutting property of steel is good more, and sulphur content can reach 0.35% in the steel.When the manganese content in the 430FM steel was higher, the sulphur in the steel mainly existed with the form of MnS, and the existence of MnS produces stress raiser; Can make smear metal be easy to fracture; Automatically chip breaking in the working angles improves the machinability of steel, thereby reaches the purpose of high-speed turning component of machine; MnS in the 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 drawback in this technology:
(1) sulphur content in the invar is high, so ftracture (or claiming straight on the head) in the end end to end of steel in the process of blooming mill cogging, when straight on the head serious, causes 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 merely 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 merely 67%, than normal base material rate 93% low 26%.
In the research and development of 430FM round steel, sheet material; Sulphur content is high in the invar; 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 make the ingot rate (steel ingot is to the lumber recovery of material) of steel be merely 50%; Than normal ingot rate 79% low 29%, increased considerably the cost of steel like this.
Summary of the invention
One object of the present invention is to provide the method for manufacture of the free-cutting ferritic stainless steel of at least one technical problem in a kind of can the 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 the solving the problems of the technologies described above.
Comprise the steps: to adopt electric arc furnace just to make steel water according to the method for manufacture of free-cutting ferritic stainless steel of the present invention; In ladle refining furnace and vacuum oxygen decarburization refining furnace, molten steel is carried out refining then; Thereby acquisition steel; Said ladle contains the above S 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 P that is no more than 0.060wt%, 0.150wt%, the Cr of 15.00-17.00wt%, the Ni that is no more than 0.60wt%, the Mo of 0.20-0.60wt%, the Ca of 0.0005-0.0030wt%, the REE of 0.0010-0.0060wt%, the iron and the unavoidable impurities of surplus, and the ratio of Mn content wherein and S content is not less than 4.
According to an aspect of the present invention, said ladle contains the C of 0.13-0.16wt%, the Mn of 1.10-1.30wt%, the Si of 0.20-0.50wt%, the P that is no more than 0.045wt%, the S of 0.18-0.25wt%, the Cr of 15.40-15.80wt%, the Mo of 0.25-0.35wt%.
According to an aspect of the present invention, said 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 purified step, the time of pure Argon is no less than 10 minutes.
According to an aspect of the present invention, said method of manufacture also comprises: with said the steel side's of pouring into ingot or slab ingot under 1550-1570 ℃ temperature and argon shield.
According to an aspect of the present invention; Said method of manufacture also comprises: under 1100-1180 ℃ temperature; 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; Said method of manufacture also comprises: under 1100-1180 ℃ temperature, make square billet get into the bar continuous rolling unit 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 of simultaneously No. three flying shears being cut end to end increases to 1.5 times-3 times of the length end to end cut under the situation of carbon alloy structure iron; Make steel billet get into finishing mill then, make round steel; Perhaps under 1100-1180 ℃ temperature, make slab get into plate mill 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, said method of manufacture 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 the Mo 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 the 0.150wt%, 15.00-17.00wt%, the Ni that is no more than 0.60wt%, 0.20-0.60wt%, the Ca of 0.0005-0.0030wt%, the REE of 0.0010-0.0060wt%, the iron and the unavoidable impurities of surplus, and the ratio of Mn content wherein and S content is not less than 4.
Embodiment
Detailed description given below is intended the present invention is described further; But can not be interpreted as it is the restriction to protection domain of the present invention, some non-intrinsically safes that those skilled in the art's spirit according to the present invention is made the present invention improve and adjustment still falls within 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 the free-cutting ferritic stainless steel is low, it is 1610 ℃ MnS that Mn can not fully generate fusing point with S, and part S is 1190 ℃ FeS with fusing point just or is that 940 ℃ the eutectiferous form of FeS-FeO exists with fusing point.Because the eutectiferous fusing point of FeS or FeS-FeO is low; So under hot processing temperature, this type sulfide will form liquid phase at the crystal boundary place, cause breaking along crystal boundary; Cause the generation of hot-short phenomenon, the end end to end that promptly in the free-cutting ferritic stainless steel operation of rolling, shows as steel straight on the head.
(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 reduction of the high-temp plastic of steel is more remarkable, and easy of crack straight on the head when therefore rolling.
(3) in the process of free-cutting ferritic stainless steel cogging or stocking, the temperature of the portion end to end of steel is on the low side, and the cracking that causes steel easily 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 method for manufacture of free-cutting ferritic stainless steel of the present invention.
In the step of the smelting of steel; Adopt electric arc furnace (for example 40t electric arc furnace) steel-making water just; 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 then; Thereby acquisition steel; Said ladle contains the above S 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 P that is no more than 0.060wt%, 0.150wt%, the Cr of 15.00-17.00wt%, the Ni that is no more than 0.60wt%, the Mo of 0.20-0.60wt%, the Ca of 0.0005-0.0030wt%, the REE of 0.0010-0.0060wt%, the iron and the unavoidable impurities of surplus, and the ratio of Mn content wherein and S content is not less than 4.According to one embodiment of present invention, in the VOD refining furnace, molten steel is carried out in the purified step, 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 behind all alloys to this section argon blowing time of watering before the steel.According to one embodiment of present invention, can Ca and REE be added molten steel in the VOD refining furnace purified later stage.
In one embodiment of the invention; Preferably; Said ladle contains the C of 0.13-0.16wt%, the Mn of 1.10-1.30wt%, the Si of 0.20-0.50wt%, the P that is no more than 0.045wt%, the S of 0.18-0.25wt%, the Cr of 15.40-15.80wt%, the Ni that is no more than 0.60wt%, the Mo of 0.25-0.35wt%, the Ca of 0.0005-0.0030wt%, the REE of 0.0010-0.0060wt%, and surplus is iron and unavoidable impurities.
In one embodiment of the invention, preferably, C content is 0.13-0.16wt% in the said steel, and Mn content is 1.10-1.30wt%.
Obtaining in the 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 the eutectiferous existence of low-melting FeS or FeS-FeO.Therefore, in follow-up hot procedure, do not have the sulfide of liquid phase, just do not exist yet, avoided the generation of the hot-short phenomenon of S along the breaking of crystal boundary at the crystal boundary place, promptly avoided in the steel rolling process end end to end straight on the head, improve the ingot rate of steel.
In addition; Steel of the present invention contains the Ca and the REE of trace; Can the MnS of long strip shape in the steel 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, and one side can reduce in the operation of rolling straight on the head, can also improve the free cutting property of steel on the other hand.
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 the argon shield, and the temperature of molten steel is 1550-1570 ℃ in the bull ladle.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, under 1100-1180 ℃ temperature, square ingot or slab ingot are rolled into square billet or slab through blooming mill, for example, specification is square billet or the thick 60-120mm of 150-200mm, the slab of 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 in this step, uses can be 825 first finishing train.
Afterwards, can under 1100-1180 ℃ temperature, make square billet get into the bar continuous rolling unit and be rolled behind the square billet whole peeling.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 of simultaneously No. three flying shears being cut end to end increases to 1.5 times-3 times of the length end to end cut under the situation of carbon alloy structure iron, thereby the head temperature that guarantees steel is higher, under straight on the head situation not; Get into finishing mill, make round steel.In one embodiment, the round steel that makes can be a Φ 20-90mm round steel.
Perhaps, can under 1100-1180 ℃ temperature, make slab get into plate mill (for example Φ 700mm plate mill) and be rolled behind the slab whole peeling.It is rolling at first to make slab get into edger roll, carries out the slab de-scaling and handles, and gets into two rolling systems, gets into four rolling systems again, makes 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 method for manufacture of free-cutting ferritic stainless steel of the present invention, because the straight on the head cracking waste product of steel significantly reduces, the ingot rate of steel can be brought up to current 79% by 50% of initial stage of development, so the cost of round steel, sheet material reduces significantly.
The key technical indexes such as mechanical property, hardness and free cutting property according to free-cutting ferritic stainless steel round steel of the present invention, sheet material are good, can be used for high speed cutting automaticmachines part processing 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 method of manufacture below in conjunction with concrete example according to free-cutting ferritic stainless steel of the present invention.
Example 1:
Adopt the 40t electric arc furnace just to make steel water; In 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein then; In the VOD refining furnace purified later stage Ca and REE are added molten steel); Thereby acquisition steel; This ladle contains the C of 0.13wt%, the Mn of 1.11wt%, the Si of 0.25wt%, the P of 0.035wt%, the S of 0.245wt%, the Cr of 15.45wt%, the Ni of 0.10wt%, the Mo of 0.25wt%, the Ca of 0.0009wt%, the REE of 0.0012wt%, the iron and the unavoidable impurities of surplus, and wherein Mn content is 4.53 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.Liquid steel temperature is 1550-1570 ℃ in the bull ladle, under argon shield, pouring molten steel is become 3t side's ingot or 3t slab ingot.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 ℃.
Under 1100-1180 ℃ temperature, use 825 just finishing train 3t side's ingot or 3t slab ingot are rolled into square billet or the thick 60-120mm of 150-200mm, the slab of 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, behind the square billet whole peeling, under 1100-1180 ℃ temperature, make square billet get into the bar continuous rolling unit 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 of simultaneously No. three flying shears being cut end to end increases to the length of being cut under the situation of carbon alloy structure iron end to end doubly, thereby the head temperature that guarantees steel is higher, under straight on the head situation not; Get into finishing mill, make Φ 20-90mm round steel.
Perhaps, behind the slab whole peeling, under 1100-1180 ℃ temperature, make slab get into Φ 700mm plate mill.It is rolling at first to make slab get into edger roll, carries out the slab de-scaling and handles, and gets into two rolling systems, gets into four rolling systems again, makes 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 end to end end in the rolling process straight on the head.
The mechanical property of the free-cutting ferritic stainless steel that makes is following: ys 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 processing field.
Example 2:
Adopt the 40t electric arc furnace just to make steel water; In 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein then; In the VOD refining furnace purified later stage Ca and REE are added molten steel); Thereby acquisition steel; This ladle contains the C of 0.135wt%, the Mn of 1.15wt%, the Si of 0.28wt%, the P of 0.038wt%, the S of 0.230wt%, the Cr of 15.52wt%, the Ni of 0.15wt%, the Mo of 0.29wt%, the Ca of 0.0011wt%, the REE of 0.0026wt%, the iron and the unavoidable impurities of surplus, and wherein Mn content is 5.00 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.Liquid steel temperature is 1550-1570 ℃ in the bull ladle, under argon shield, pouring molten steel is become 3t side's ingot or 3t slab ingot.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 ℃.
Under 1100-1180 ℃ temperature, use 825 just finishing train 3t side's ingot or 3t slab ingot are rolled into square billet or the thick 60-120mm of 150-200mm, the slab of 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, behind the square billet whole peeling, under 1100-1180 ℃ temperature, make square billet get into the bar continuous rolling unit 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 of simultaneously No. three flying shears being cut end to end increases to the length of being cut under the situation of carbon alloy structure iron end to end doubly, thereby the head temperature that guarantees steel is higher, under straight on the head situation not; Get into finishing mill, make Φ 20-90mm round steel.
Perhaps, behind the slab whole peeling, under 1100-1180 ℃ temperature, make slab get into Φ 700mm plate mill.It is rolling at first to make slab get into edger roll, carries out the slab de-scaling and handles, and gets into two rolling systems, gets into four rolling systems again, makes 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 end to end end in the rolling process straight on the head.
The mechanical property of the free-cutting ferritic stainless steel that makes is following: ys 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 processing field.
Example 3:
Adopt the 40t electric arc furnace just to make steel water; In 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein then; In the VOD refining furnace purified later stage Ca and REE are added molten steel); Thereby acquisition steel; This ladle contains the C of 0.14wt%, the Mn of 1.18wt%, the Si of 0.30wt%, the P of 0.041wt%, the S of 0.225wt%, the Cr of 15.55wt%, the Ni of 0.22wt%, the Mo of 0.31wt%, the Ca of 0.0016wt%, the REE of 0.0038wt%, the iron and the unavoidable impurities of surplus, and wherein Mn content is 5.24 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.Liquid steel temperature is 1550-1570 ℃ in the bull ladle, under argon shield, pouring molten steel is become 3t side's ingot or 3t slab ingot.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 ℃.
Under 1100-1180 ℃ temperature, use 825 just finishing train 3t side's ingot or 3t slab ingot are rolled into square billet or the thick 60-120mm of 150-200mm, the slab of 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, behind the square billet whole peeling, under 1100-1180 ℃ temperature, make square billet get into the bar continuous rolling unit 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 of simultaneously No. three flying shears being cut end to end increases to the length of being cut under the situation of carbon alloy structure iron end to end doubly, thereby the head temperature that guarantees steel is higher, under straight on the head situation not; Get into finishing mill, make Φ 20-90mm round steel.
Perhaps, behind the slab whole peeling, under 1100-1180 ℃ temperature, make slab get into Φ 700mm plate mill.It is rolling at first to make slab get into edger roll, carries out the slab de-scaling and handles, and gets into two rolling systems, gets into four rolling systems again, makes 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 end to end end in the rolling process straight on the head.
The mechanical property of the free-cutting ferritic stainless steel that makes is following: ys 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 processing field.
Example 4:
Adopt the 40t electric arc furnace just to make steel water; In 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein then; In the VOD refining furnace purified later stage Ca and REE are added molten steel); Thereby acquisition steel; This ladle contains the C of 0.15wt%, the Mn of 1.21wt%, the Si of 0.33wt%, the P of 0.045wt%, the S of 0.210wt%, the Cr of 15.60wt%, the Ni of 0.28wt%, the Mo of 0.34wt%, the Ca of 0.0025wt%, the REE of 0.0043wt%, the iron and the unavoidable impurities of surplus, and wherein Mn content is 5.76 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.Liquid steel temperature is 1550-1570 ℃ in the bull ladle, under argon shield, pouring molten steel is become 3t side's ingot or 3t slab ingot.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 ℃.
Under 1100-1180 ℃ temperature, use 825 just finishing train 3t side's ingot or 3t slab ingot are rolled into square billet or the thick 60-120mm of 150-200mm, the slab of 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, behind the square billet whole peeling, under 1100-1180 ℃ temperature, make square billet get into the bar continuous rolling unit 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 of simultaneously No. three flying shears being cut end to end increases to the length of being cut under the situation of carbon alloy structure iron end to end doubly, thereby the head temperature that guarantees steel is higher, under straight on the head situation not; Get into finishing mill, make Φ 20-90mm round steel.
Perhaps, behind the slab whole peeling, under 1100-1180 ℃ temperature, make slab get into Φ 700mm plate mill.It is rolling at first to make slab get into edger roll, carries out the slab de-scaling and handles, and gets into two rolling systems, gets into four rolling systems again, makes 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 end to end end in the rolling process straight on the head.
The mechanical property of the free-cutting ferritic stainless steel that makes is following: ys 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 processing field.
Example 5:
Adopt the 40t electric arc furnace just to make steel water; In 40t LF and 40t VOD refining furnace, molten steel is carried out refining (wherein then; In the VOD refining furnace purified later stage Ca and REE are added molten steel); Thereby acquisition steel; This ladle contains the C of 0.16wt%, the Mn of 1.28wt%, the Si of 0.39wt%, the P of 0.025wt%, the S of 0.195wt%, the Cr of 15.79wt%, the Ni of 0.20wt%, the Mo of 0.35wt%, the Ca of 0.0029wt%, the REE of 0.0057wt%, the iron and the unavoidable impurities of surplus, and wherein Mn content is 6.56 with the ratio of S content.Pure argon blowing time is no less than 10 minutes.Liquid steel temperature is 1550-1570 ℃ in the bull ladle, under argon shield, pouring molten steel is become 3t side's ingot or 3t slab ingot.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 ℃.
Under 1100-1180 ℃ temperature, use 825 just finishing train 3t side's ingot or 3t slab ingot are rolled into square billet or the thick 60-120mm of 150-200mm, the slab of 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, behind the square billet whole peeling, under 1100-1180 ℃ temperature, make square billet get into the bar continuous rolling unit 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 of simultaneously No. three flying shears being cut end to end increases to the length of being cut under the situation of carbon alloy structure iron end to end doubly, thereby the head temperature that guarantees steel is higher, under straight on the head situation not; Get into finishing mill, make Φ 20-90mm round steel.
Perhaps, behind the slab whole peeling, under 1100-1180 ℃ temperature, make slab get into Φ 700mm plate mill.It is rolling at first to make slab get into edger roll, carries out the slab de-scaling and handles, and gets into two rolling systems, gets into four rolling systems again, makes 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 end to end end in the rolling process straight on the head.
The mechanical property of the free-cutting ferritic stainless steel that makes is following: ys 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 processing field.
Claims (10)
1. the method for manufacture of a free-cutting ferritic stainless steel comprises the steps:
Adopt electric arc furnace just to make steel water, in ladle refining furnace and vacuum oxygen decarburization refining furnace, molten steel is carried out refining then, thus the acquisition steel,
Said ladle contains the above S 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 P that is no more than 0.060wt%, 0.150wt%, the Cr of 15.00-17.00wt%, the Ni that is no more than 0.60wt%, the Mo of 0.20-0.60wt%, the Ca of 0.0005-0.0030wt%, the REE of 0.0010-0.0060wt%, the iron and the unavoidable impurities of surplus, and the ratio of Mn content wherein and S content is not less than 4.
2. the method for manufacture of free-cutting ferritic stainless steel according to claim 1; Wherein, said ladle contains the C of 0.13-0.16wt%, the Mn of 1.10-1.30wt%, the Si of 0.20-0.50wt%, the P that is no more than 0.045wt%, the S of 0.18-0.25wt%, the Cr of 15.40-15.80wt%, the Mo of 0.25-0.35wt%.
3. the method for manufacture of free-cutting ferritic stainless steel according to claim 1, wherein, said ladle contains the C of 0.13-0.16wt% and the Mn of 1.10-1.30wt%.
4. the method for manufacture of free-cutting ferritic stainless steel according to claim 1 wherein, is carried out in the purified step molten steel in vacuum oxygen decarburization refining furnace, and the time of pure Argon is no less than 10 minutes.
5. the method for manufacture of free-cutting ferritic stainless steel according to claim 1, wherein, said method of manufacture also comprises: with said the steel side's of pouring into ingot or slab ingot under 1550-1570 ℃ temperature and argon shield.
6. the method for manufacture of free-cutting ferritic stainless steel according to claim 5, wherein, said method of manufacture also comprises: under 1100-1180 ℃ temperature, 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 is reduced to the minimum value of permission.
7. the method for manufacture of free-cutting ferritic stainless steel according to claim 6, wherein, said method of manufacture also comprises:
Under 1100-1180 ℃ temperature, making square billet get into the bar continuous rolling unit is 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 of simultaneously No. three flying shears being cut end to end increases to 1.5 times-3 times of the length end to end cut under the situation of carbon alloy structure iron, makes steel billet get into finishing mill then, makes round steel;
Perhaps under 1100-1180 ℃ temperature, make slab get into plate mill 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.
8. the method for manufacture of free-cutting ferritic stainless steel according to claim 7, wherein, said method of manufacture also comprises: with round steel or sheet material at 850 ± 10 ℃ of insulations 8-10 hour, air cooling then.
9. free-cutting ferritic stainless steel; Comprise the above S 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 P that is no more than 0.060wt%, 0.150wt%, the Cr of 15.00-17.00wt%, the Ni that is no more than 0.60wt%, the Mo of 0.20-0.60wt%, the Ca of 0.0005-0.0030wt%, the REE of 0.0010-0.0060wt%, the iron and the unavoidable impurities of surplus, and the ratio of Mn content wherein and S content is not less than 4.
10. free-cutting ferritic stainless steel according to claim 9; Wherein, said ladle contains the C of 0.13-0.16wt%, the Mn of 1.10-1.30wt%, the Si of 0.20-0.50wt%, the P that is no more than 0.045wt%, the S of 0.18-0.25wt%, the Cr of 15.40-15.80wt%, the Mo of 0.25-0.35wt%.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104438418A (en) * | 2014-09-28 | 2015-03-25 | 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 |
| CN104962800A (en) * | 2015-07-03 | 2015-10-07 | 共享铸钢有限公司 | Smelting method for stainless steel material |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392355A (en) * | 2007-09-19 | 2009-03-25 | 大同特殊钢株式会社 | Free-cutting ferritic stainless steel |
| CN101517116A (en) * | 2006-09-13 | 2009-08-26 | 尤迪霍尔姆工具公司 | Steel alloy, a holder or a holder detail for a plastic moulding tool, a tough hardened blank for a holder or holder detail, a process for producing a steel alloy |
-
2011
- 2011-10-14 CN CN2011103124750A patent/CN102363869B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101517116A (en) * | 2006-09-13 | 2009-08-26 | 尤迪霍尔姆工具公司 | Steel alloy, a holder or a holder detail for a plastic moulding tool, a tough hardened blank for a holder or holder detail, a process for producing a steel alloy |
| CN101392355A (en) * | 2007-09-19 | 2009-03-25 | 大同特殊钢株式会社 | Free-cutting ferritic stainless steel |
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| CN104438418A (en) * | 2014-09-28 | 2015-03-25 | 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 |
| CN104962800A (en) * | 2015-07-03 | 2015-10-07 | 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 |
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| 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 |
| CN110819913A (en) * | 2019-11-27 | 2020-02-21 | 攀钢集团江油长城特殊钢有限公司 | Chalcogenide free-cutting stainless steel and preparation method thereof |
| CN112063923A (en) * | 2020-09-07 | 2020-12-11 | 成都先进金属材料产业技术研究院有限公司 | 1300 MPa-grade RE-containing chalcogenide free-cutting steel 60mm bar and preparation method thereof |
| CN113584411A (en) * | 2021-07-30 | 2021-11-02 | 大冶特殊钢有限公司 | Sulfur-containing ferritic stainless steel and manufacturing method thereof |
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