CN101018908B - Steel shell for a suction roll and a method of producing a steel product - Google Patents

Steel shell for a suction roll and a method of producing a steel product Download PDF

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CN101018908B
CN101018908B CN2005800300058A CN200580030005A CN101018908B CN 101018908 B CN101018908 B CN 101018908B CN 2005800300058 A CN2005800300058 A CN 2005800300058A CN 200580030005 A CN200580030005 A CN 200580030005A CN 101018908 B CN101018908 B CN 101018908B
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steel
weight
suction roll
roll shell
machinability
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CN101018908A (en
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M·里尔亚斯
P·约翰森
C·比尔格维斯特
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Outokumpu Oyj
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D21F1/50—Suction boxes with rolls
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D21F3/105—Covers thereof

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Articles (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Adjustment And Processing Of Grains (AREA)

Abstract

The invention relates to a suction roll shell 9 having a plurality of through holes 7. The shell is made of a stainless ferrite-austenite steel having a micro-structure essentially consisting of 35-65 % by volume of ferrite and 35-65 % by volume of austenite. The steel has a composition containing, among other things, 0.005-0.07 C and 0.15-0.30 N, in % by weight. The invention also relates to a suction roll comprising the inventive suction roll shell and a method of producing a steel product.

Description

A kind of steel sheel of suction roll and method of producing product made from steel of being used for
Technical field
The present invention relates to a kind of steel sheel of suction roll (suction roll) and method of producing product made from steel of being used for, in said method, through the cutting operation working steel products such as milling, turning and/or boring.
Background of invention
Stainless steel need to be used to the field of highly corrosion resistant.In the environment of ocean, papermaking and pulp industry and chemical industry, require highly corrosion resistant.An instance is the suction roll shell that is used for paper machine, and it is processed by stainless steel.One type stainless steel is so-called ferrite and the austenitic duplex steel of comprising.Well-known, the duplex steel combines high mechanical properties and toughness and good anti-corrosion, especially anticorrosion stress-resistant and corrosion fatigue.For corrosion resistance and such as the mechanical performance of solderability, importantly the solvent austenite of steel and ferritic well balanced.In the nearest exploitation of duplex steel, hope to have the 35-65% of comprising ferrite, all the other are austenitic microscopic structures.In the field that requires high strength and good corrosion resistance, the duplex steel more and more can be competed with traditional austenitic stainless steel mutually.In disclosed U.S. Patent application No.2003/0172999, this type of steel have been described.The said steel of in this publication, describing are the ferritic-austenitic stainless steels that have basically the microscopic structure of being made up of 35-65 volume % ferrite and 35-65 volume % austenite.It is 0.005-0.07C that described steel has the percentage by weight of comprising, 0.1-2.0Si, 3-8Mn, 19-23Cr, the chemical composition of 0.15-0.30N and 0.5-1.7Ni.Equally also can comprise other element.
Nitrogen is for extremely important the steel described in US2003/0172999, because nitrogen is main austenite organizator and intensity and the corrosion resistance that helps said steel.For this reason, the nitrogen content of said steel should be in the scope of 0.15-0.30% according to estimates, and preferred in the scope of 0.20-0.24%.Yet, lack machinability like the previous steel type that shows with this high nitrogen-containing.
In most cases, the stainless steel that is used for specific products must receive the cutting operation of some types, such as milling, and turning or boring.In himself, austenite and duplex stainless steel are to lack machinability, and carry out various measures thus and increase stainless machinability.Know as previous, reduced machinability in the existence of stainless nitrogen in steel.For example at United States Patent(USP) No. 4,769, in 213, advised a kind ofly being no more than 0.05 weight % through the total content that reduces carbon and nitrogen content so that carbon and nitrogen and increasing the method for the machinability of martensitic stain less steel with this.Yet, to compare with the duplex steel, martensite steel has relatively poor corrosion resistance.About austenitic stainless steel, at United States Patent(USP) No. 5,482, the content that the content of suggestion carbon and nitrogen should reduce carbon consequently or nitrogen in 674 all is not more than about 0.035 weight %.The adding that is known that sulphur equally can increase machinability.Therefore, United States Patent(USP) No. 4,784,828 suggestions should add sulphur so that increase machinability in austenitic stainless steel.Think that equally the content of carbon and nitrogen should be very low, amount to 0.065 weight % at the most.Yet, to compare with the duplex steel, austenitic steel has lower intensity.
United States Patent(USP) No. 4,964, martensitic stain less steel is used in 924 suggestions in suction roll.In this publication, think because they are difficult to boring, so the ferritic-austenitic duplex stainless steel is not suitable for the material as suction roll.On the contrary; The stainless steel that suggestion is suitable for suction roll shell should be the martensite type, comprising the carbon that is not more than 0.06 a weight % greater than 0, is higher than 0 and be not more than the silicon of 2 a weight %; Be higher than 0 and be not more than the manganese of 2 a weight %; The nickel of 3-6 weight %, the chromium of 14-17 weight %, the copper of the molybdenum of 1-3 weight % and from 0.5 to 1.5 a weight %.
The object of the present invention is to provide solution to the problems described above, find a kind ofly to have high strength and good corrosion resistance and be suitable for cutting operation in addition and needn't accept the steel of sulfur adding treatment.Another object of the present invention provides a kind of good corrosion resistance that has, and is easy to the suction roll shell of making through cutting operation.
Summary of the invention
Surprisingly; The inventor finds that the steel of the type of in above-mentioned US 2003/0172999, describing not only have high strength and good corrosion resistance, and said material is suitable for cutting operation equally such as turning; Milling and boring, and said material is not handled through adding sulphur.The inventor finds that equally said material especially is suitable as the material of paper machine suction roll, and advantageously makes the suction roll shell of this material.Therefore, the present invention relates to the suction roll shell of this material.The present invention can also can be regarded as and be used for cutting operation, the method for using when especially making suction roll shell, but also can be used for making other products, and rotary machine part for example is such as handle.The present invention can also be defined as the purposes of said steel as the workpiece that in the cutting operation of steel, uses.
Therefore, the present invention relates to a kind of suction roll shell with a plurality of through holes.Suction roll shell according to the present invention is processed by ferritic-austenitic stainless steel, and it has basically the microscopic structure of being made up of the austenite of the ferrite of 35-65 volume % and 35-65 volume %.Said steel form will be in detailed description more detailed description.
The invention still further relates to the suction roll that comprises suction roll shell of the present invention.
In preferred embodiments, said cutting operation comprises at least one through hole of brill, and preferably bores a plurality of holes.In advantageous embodiment especially, said method comprises bores a hundreds of thousands hole.Corresponding length of boring is some kms.Said cutting operation can comprise the turning of the interior outside of said housing equally.
Brief Description Of Drawings
Fig. 1 shows the bending of the blank that is used for suction roll shell.
Fig. 2 shows the blank of crooked and formation housing welded together.
Fig. 3 schematically shows the first step that is processed in the housing shown in Fig. 2.
Fig. 4 shows second step of the said housing of processing.
Fig. 5 shows the suction roll shell of completion.
Fig. 6-9 shows the result of said steel used according to the invention and the contrast test of other steel aspect machinability.
Detailed description of the present invention
The manufacturing of suction roll shell has schematically been described hereinafter.With reference to figure 1, show the first step of making suction roll shell.As shown in fig. 1, basic flat blank 1 roll between two rolls 2,3 is crooked, and this is known and there is no need more detailed description here.After bending to basically annular, terminal welded together with said blank 1, so welding point combines to form parts 9 with blank 1.Through ring joint a plurality of parts are combined into housing then, after welding, said housing are heat-treated.How housing 9 that Fig. 3 shows acquisition like this can carry out the process operation such as turning.Fig. 3 shows the cutting element 5 that acts on said surface of shell 9.The purpose of turning operation is to guarantee the smooth surface and the rule of housing 9.Fig. 4 schematically shows the subsequent step of said manufacturing approach, wherein holes through 6 pairs of housings 9 of drill bit, to housing a large amount of through holes 7 is provided whereby.Fig. 5 shows the suction roll shell 8 of completion, and it has cylindrical (circular cylindrical) housing 9 and through hole 7 thereof.Fig. 5 equally schematically shows, and the end of suction roll shell 8 can be by side cover 10 sealings.When using said suction roll shell 8, its inside can be connected to the vacuum source (not shown), makes in said accompanying drawing, only to show the minority hole through through hole 7 and from outside absorbing air.Will be recognized that in real world applications the number in hole can be very big, such as 100,000 holes or more.
Suction roll shell was to be processed by a kind of material of selling 3RE60 Avesta SRG by name in the past.This steel is a kind of ferritic-austenitic stainless steel, and it has improved its machinability through sulphuring treatment and has had following typical case forms, and percentage by weight does
C 0.02
Si 1.50
Cr 1?8.5
Ni 4.90
Mo 2.80
N 0.08
S 0.02
The 3RE60 steel is used to make suction roll shell and has used about 30 years, and has good result, and before about 10 years, changes 3RE60 SRG into thereby provide a kind of additive to be used to improve its title of its machinability.Now, said steel is known as 3RE60 Avesta SRG.
Nowadays there is another kind of ferritic-austenitic steel in surprising showing, wherein added high nitrogen-containing, and have compare with the improved 3RE60 Avesta of machinability SRG same good or in some aspects even better machinability.This steel has basically the microstructure of being made up of the austenite of the ferrite of 35-65 volume % and 35-65 volume %, with and chemical composition comprise by weight percentage:
C 0.005
Si 0.1-2.0
Mn 3-8
Cr 19-23
Ni 0.5-1.7
N 0.15-0.3
A kind of steel that is particularly suitable for this application suitably comprises:
The randomly Mo and/or the W of total content no more than 1.0 (Mo+W/2),
Randomly Cu is at most the maximum of 1.0 Cu, and surplus is iron and impurity.
For ferrite in the said alloy and austenite organizator, i.e. chromium and nickel equivalent should be preferably following condition:
20＜Cr eq＜24.5
10＜Ni Eq, wherein
Cr eq＝Cr+1.5Si+Mo+2Ti+0.5Nb
Ni eq＝Ni+0.5Mn+30(C+N)+0.5(Cu+Co)。
In useful embodiment, said ladle is drawn together 0.02-0.05C.Suitably, said ladle is drawn together 0.18-0.26 N and 20-23Cr advantageously.In preferred embodiments, said ladle is drawn together 0.8-1.70Ni, and even preferred 1.35-1.7Ni.
The steel of this composition has been described in U.S. Patent No. application No.2003/0172999.
In especially advantageous embodiment of the present invention, said ladle is drawn together 0.22N, 21.5Cr, 1.5Ni, 0.3Mo, 5Mn and the C that is not more than 0.04.This steel is by OutokumpuStainless AB, and Box 74, and SE-774 22, and AVESTA sells.This steel is sold with title LDX 2101
Figure 058300058_0
by Outokumpu.This is called the registration mark of European Union.Accordingly, said LDX 2101
Figure 058300058_1
steel is particularly useful for suction roll shell.The content that copper and silicon especially are fit to is respectively 0.3Cu and 0.7Si.0.3Cu and the standard of 0.7Si (percentage by weight) is used for LDX 2101
Figure 058300058_2
.
Compare with for example steel 3RE60 Avesta SRG, the steel of the above-mentioned type has high relatively nitrogen content.As well-known, nitrogen tends to damage machinability, so the machinability expection may be relatively poor.Yet surprising discovery is higher than desired effect greatly according to the machinability of steel used in the present invention.
Figure 6 shows the LDX? 2101
Figure 058300058_3
Steel and the other two are called 304L? PRODEC
Figure 058300058_4
and 316L? PRODEC The machinability - Improved austenitic steels comparative test results.Steel 304L PRODEC
Figure 058300058_6
has the composition of following percentage by weight:
C 0.02
Si 0.5
Mn 1.5
Cr 18.2
Ni 8.4
Mo does not have basically
N 0.07
S 0.02
Said steel 316L PRODEC
Figure 058300058_7
has following composition:
C 0.02
Si 0.5
Mn 1.5
Cr 17.2
Ni 11.2
Mo 2.3
N 0.05
S 0.02
Because the nitrogen content of two kinds of machinability-improved austenitic steel 304L PRODEC
Figure 058300058_8
and 316LPRODEC is markedly inferior to LDX 2101
Figure 058300058_10
steel, expects that usually these steel are better than LDX 2101 steel aspect machinability.Yet in the turning test, show; 30 minutes process times of LDX 2101
Figure 058300058_12
steel; Under the situation of using high-speed steel tool; Compare with other two kinds of steel and to have significantly higher cutting speed, this is shown in Fig. 6.
Figure 7 shows the LDX? 2101 Steel 304L? PRODEC
Figure 058300058_14
and 316L? PRODEC
Figure 058300058_15
Additional comparative test results.Fig. 7 shows the attribute testing of 15 minute process time, and wherein the cutting edge through carbide alloy carries out turning.In this case; LDX 2102
Figure 058300058_16
steel is compared with other two kinds of steel, and the cutting speed that is obtained is low a little.Yet said difference also is inappreciable.
Fig. 8 shows another test, wherein steel LDX 2101
Figure 058300058_17
is compared with the conventional duplex steel of selling by name 2205.This than LDX 2101
Figure 058300058_18
more the steel of high-alloying be standardized (EN1.4462) and in number of applications, use.It does not have machinability-improved additive and can not be used for such suction roll shell.2205 have following composition:
C 0.02
Si 0.4
Mn 1.5
Cr 22.2
Ni 5.7
Mo 3.1
N 0.17
S 0.001
In this test, service life of instrument when the cutting edge that utilizes carbide alloy carries out milling relatively.Can find out from Fig. 8; Compare with the processing of steel 2005; When processing LDX 2101
Figure 058300058_19
steel, the service life of instrument is significantly longer.
At last, another test has been shown in Fig. 9.In the test shown in Fig. 9; LDX2101
Figure 058300058_20
steel is compared with three kinds of other steel types that are used for suction roll shell; I.e. 2304 Avesta SRG, 3RE60 Avesta SRG and 2205 Avesta SRG.All steel that are marked as SRG (suction roll grade) improve machinability through adding sulphur.Steel 2304 Avesta SRG have following typical case and form:
C 0.02
Si 0.8
Mn 1.5
Cr 22.7
Ni 4.7
Mo 0.3
N 0.09
S 0.02
Steel 2205 Avesta SRG have following typical case and form:
C 0.017
Si 0.6
Mn 1.35
Cr 22.0
Ni 5.7
Mo 2.9
N 0.13
S 0.02
In test shown in Figure 9, compare the obtainable cutting speed of different materials under the long boring length situation of the 1000mm that does not have tool failures.As finding out among Fig. 9; LDX 2101 significantly is better than machinability-improvement steel 2205 Avesta SRG and 2304 Avesta SRG; And good equally with machinability-improvement steel 3RE60 Avesta SRG in this respect, although LDX 2101
Figure 058300058_22
comprises significantly more nitrogen than steel 3RE60 Avesta SRG.If under the situation that does not have so-called machinability-improvement additive such as sulphur, can obtain the machinability of said material, this will be tangible technical advantage, because these additives will cause a large amount of defectives, such as infringement rollability and damage corrosion resistance.
Should be understood that although described the present invention according to suction roll shell and method, this only is the different aspect of a kind of invention and identical invention, because be applicable to that according to the method for the invention manufacturing is according to suction roll shell of the present invention.
Through the present invention, in the advantage that is obtained, the housing of completion has obtained good corrosion resistance.

Claims (9)

1. suction roll shell (9) with a plurality of through holes (7) is characterized in that said housing processed by ferritic-austenitic stainless steel, and said steel has basically the microscopic structure of being made up of the austenite of the ferrite of 35-65 volume % and 35-65 volume %; And its chemical composition comprises 0.005-0.07 weight %C; 0.1-2.0 weight %Si, 3-8 weight %Mn, 19-23 weight %Cr; 0.5-1.7 weight %Ni and 0.15-0.30 weight %N.
2. a suction roll shell as claimed in claim 1 (9) is characterized in that said ladle draws together
A) no more than 1.0 weight % (Mo+W/2),
B) be at most 1.0 weight %Cu, surplus is iron and impurity, and for chromium in the said alloy and nickel equivalent, satisfies following condition:
C) 20 weight %＜Cr Eq＜24.5 weight %
D) 10 weight %＜Ni Eq, wherein
e)Cr eq＝Cr+1.5Si+Mo+2Ti+0.5Nb
f)Ni eq＝Ni+0.5Mn+30(C+N)+0.5(Cu+Co)。
3. suction roll shell (9) according to claim 1 or claim 2 is characterized in that said ladle draws together 0.02-0.05 weight %C.
4. suction roll shell (9) according to claim 1 or claim 2 is characterized in that said ladle draws together the N of 0.18-0.26 weight %.
5. suction roll shell (9) according to claim 1 or claim 2 is characterized in that said ladle draws together the Cr of 20-23 weight %.
6. suction roll shell (9) according to claim 1 or claim 2 is characterized in that said ladle draws together the Ni of 0.8-1.70 weight %.
7. a suction roll shell as claimed in claim 6 (9) is characterized in that said ladle draws together the Ni of 1.35-1.7 weight %.
8. suction roll shell (9) according to claim 1 or claim 2 is characterized in that said ladle draws together 0.22 weight %N, 21.5 weight %Cr; 1.5 weight %Ni, 0.3 weight %Mo, 5 weight %Mn; The Si. of the Cu of the C of no more than 0.04 weight % and 0.3 weight % and 0.7 weight %
9. a suction roll (9) is characterized in that, it has basis like arbitrary described suction roll shell (9) among the claim 1-8.
CN2005800300058A 2004-09-07 2005-08-19 Steel shell for a suction roll and a method of producing a steel product Active CN101018908B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE0402141A SE528375C2 (en) 2004-09-07 2004-09-07 A suction roll sheath made of steel as well as a method for producing a suction roll sheath
SE04021416 2004-09-07
SE0402141-6 2004-09-07
PCT/SE2005/001220 WO2006041344A1 (en) 2004-09-07 2005-08-19 A steel shell for a suction roll and a method of producing a steel product

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