CN102528323B

CN102528323B - Alloy pipe wire produced by prefabricated alloy powder for overlaying welding of support roller and manufacture method of alloy pipe wire

Info

Publication number: CN102528323B
Application number: CN201210014685.6A
Authority: CN
Inventors: 黄权; 陈晔; 朱亚忠; 隆奎
Original assignee: SHANGHAI JINGANG METALLURGICAL MATERIAL CO Ltd
Current assignee: SHANGHAI JINGANG METALLURGICAL MATERIAL CO Ltd
Priority date: 2012-01-18
Filing date: 2012-01-18
Publication date: 2014-05-14
Anticipated expiration: 2032-01-18
Also published as: CN102528323A

Abstract

The invention belongs to the technical field of welding, in particular to an alloy pipe wire produced by prefabricated alloy powder for overlaying welding of a support roller and a manufacture method of the alloy pipe wire. The preparation method disclosed by the invention comprises the following specific steps of: firstly smelting a filler alloy for manufacturing the alloy pipe wire by adopting a non-vacuum induction furnace, and prefabricating into filler alloy powder with the required mixture ratio of ingredients through an atomization method; further filling the prefabricated filler alloy powder into a steel strip, and rolling through the steel strip for forming; and drawing into a pipy welding wire in the required diameter according to the needs after rolling. The alloy pipe wire for overlaying welding of the support roller, provided by the invention, can ensure the uniformity in the ingredients of an overlaying welding layer formed after the support roller is repaired through overlaying welding and the uniformity in the hardness of the roller surface. Furthermore, non-metal inclusions and other impurities can be reduced and eliminated, the filler alloy powder can be optimized and purified, the strength, the toughness and the anti-contact fatigue strength of the material can be further improved, and the metal subject to overlaying welding has excellent anti-heat cracking performance.

Description

Adopt backing roll alloy for surfacing pipe silk of prealloyed powder making and preparation method thereof

Technical field

The invention belongs to welding technology field, be specifically related to a kind of backing roll alloy for surfacing pipe silk and preparation method thereof.

Background technology

Backing roll is the critical piece of steel mill's rolling machine system, and effect is that auxiliary roller is rolled.Backing roll stable, strip profile and surface quality to Rolling Production the same as working roll produces material impact.Therefore, must regularly roll off the production line and carry out grinding processing, with remedy of casehardening layer return roller surface hardness.When roller footpath reduces to after dimension limit, just cannot continue to use.Some backing rolls lost efficacy because localized delamination only loses a small amount of working lining.Not only cause the wasting of resources if directly scrapped, Ye Shi steel mill production cost rises.At present, the backing roll of iron company generally adopts by tubulose alloy tube wire submerged arc overlay welding technology and carries out surface reparation and strengthening both at home and abroad, has received certain result of use.

The backing roll the key technical indexes that built-up welding is manufactured again should reach body surface hardness 55-60HS, and its deviation is ± 3HS.Body surface case depth >=45mm, roll surface each several part does not allow to exist the built-up welding such as crackle or slag inclusion defect, and upper machine examination will meet steel rolling demand service life, can not be lower than two cycles.

Because conventional tubulose alloy tube wire manufacture craft is that the alloy powder of mechanical mixture is filled in pipe silk steel band and makes alloy tube wire through drawing.Unavoidably because alloy powder mixes the inhomogeneous inhomogeneities of built-up welding composition and the inhomogeneities of roll surface hardness of causing.For this reason, according to the requirement of backing roll built-up welding re-manufacturing technology, adopt the technique of prefabricated filler alloys powder alloying pipe silk, develop backing roll built-up welding tubulose alloy tube wire.

Summary of the invention

The object of the present invention is to provide a kind of tubulose alloy tube wire for backing roll built-up welding that adopts prefabricated filler alloys powder making and preparation method thereof, guarantee the uniformity of overlay cladding composition and the uniformity of roll surface hardness after backing roll built-up welding reparation, improve the service life of backing roll.

The backing roll alloy for surfacing pipe silk that the present invention adopts prefabricated filler alloys powder to make, concrete steps are as follows:

1, more prefabricated filler alloys powder packing is entered in steel band, use steel band roll forming.

2,, after rolling, as required, be drawn into the flux cored wire of required diameter.

Alloy tube wire of the present invention, its alloy compositions by weight percentage (composition % before built-up welding) is as follows:

C

Mn

Si

Cr

Mo

W

V

S

P

0.2-0.25

1.20-2.50

0.50-1.10

4.50-6.50

1.20-1.60

1.00-1.80

0.30-0.50

≤0.030

All the other are F e.

Backing roll heap postwelding overlay cladding composition and hardness are as follows:

1, overlay cladding composition (%):

C

Mn

Si

Cr

Mo

W

V

S

P

0.10-0.15

0.80-1.20

0.50-0.80

4.50-6.00

1.00-1.50

0.80-1.60

≤0.30

≤0.03

All the other are F e.

2, postwelding hardness: (HS) 55-60

Before built-up welding, roller needs preheating, preheat temperature 350-400 ℃, and temperature retention time is looked roller diameter size and is determined.Roller overlaying welding

Time interlayer temperature be 300-350 ℃.

In the present invention, described alloy tube wire is designated as Diamond324L, and matching used solder flux adopts HJ-107(SSD-II with it).

In the present invention, described filler alloys powder is mainly by C, Mn, and Si, Cr, Mo, V, the composition of W seven elements, preparation method is for adopting non-vacuum induction furnace furnace lining; C, Mn, Si, Cr, Mo, V, the component formula of W seven elements is by weight percentage:

C ； 1.5-2.0%

Mn ； 8.5-10.5%

Si ； 1-1.6%

Cr ； 25-30%

Mo ； 3.5-4.5%

W ； 3.5-4.5%

V ； 0.8-1.6%

All the other are iron.Total amount is 100%.

Smelting technology parameter is as follows:

Alternating voltage: 415 ~ 420V;

DC voltage: 400 ~ 415V;

DC current: 120 ~ 200A;

Voltage of intermediate frequency: 600 ~ 620V;

IF-FRE (Hz): 750 ~ 800 (Hz);

Smelter flowsheet is:

Before blow-on, add whole iron (concrete available scrap iron and steel), ferrotungsten, carbon dust and vanadium iron, and half low-carbon ferrochromium;

Indirect current:

Switch on 25 ~ 30 minutes time, add second half low-carbon ferrochromium;

Switch on 30 ~ 35 minutes time, add monocrystalline silicon;

Switch on 35 ~ 50 minutes time, add whole molybdenum-iron;

Switch on 50 ~ 55 minutes time, add electrolytic manganese;

Switch on 55 ~ 60 minutes time, add silico-calcium, deoxidation;

Switch on 60 ~ 65 minutes time, have a power failure, drag for slag, in 4 ~ 5 minutes, drag for most scum silica frost;

Strengthen energising power: logical direct current: 180 ~ 200A, heat 8 ~ 12 minutes, when furnace temperature rises to 1550 ℃ ~ 1600 ℃, have a power failure, open water under high pressure (hydraulic pressure is generally 90 ~ 110 atmospheric pressure), carry out hydraulic atomized cast, obtain water atomization alloyed powder.

In above-mentioned technique, described ferrotungsten, vanadium iron, ferrochrome, molybdenum-iron, is tungsten, vanadium, chromium, the raw alloy of molybdenum; The consumption of these raw alloys, according to the content of elemental tungsten, vanadium, chromium, molybdenum in raw alloy, and elemental tungsten, vanadium, chromium, the consumption of molybdenum in filler alloys powder, calculate.

The present invention compares with existing alloy tube wire Manufacturing Techniques, has following substantive distinguishing features and remarkable advantage: thus the stirring of the electromagnetic stirring force that prefabricated filler alloys powder produces by refining and the induction furnace of alloy element in fusion process has guaranteed that the uniformity of filler alloys powder has guaranteed the uniformity of overlay cladding composition.In addition, by the refining of alloy element in fusion process, optimize and purified filler alloys powder, reduce and eliminated the impurity such as non-metallic inclusion, particularly S, P content obviously reduces.Meanwhile, the optimization of filler alloys powder and purification, improved obdurability and the anti-contact fatigue strength of material, makes deposited metal have good hot-cracking resistance, improves the service life of backing roll.

The specific embodiment

Below by implementing to further describe the present invention.

Embodiment 1

Press Diamond324L pipe silk component prescription, preparation filler alloys material.Adopt the prefabricated filler alloys powder of non-vacuum induction furnace melting atomization method, make through rolling drawing the tubulose alloy tube wire that diameter is Φ 4.0mm.The built-up welding of this alloy tube wire application and backing roll.

1, Diamond324L pipe silk composition

C

Mn

Si

Cr

Mo

W

V

S

P

0.22

1.15

1.10

5.50

1.20

1.10

0.50

≤0.030

2, Diamond324L pipe silk overlay cladding composition %

C	Mn	Si	Cr	Mo	W	V	S	P
									0.11	0.92	0.72	4.70	1.10	0.78	0.26	0.015	0.026

3, heap postwelding hardness (HS): 58;

4, bead-welding technology performance:

Arc stability, figuration of bead is good, and the removability of slag is good, weld seam pore-free, slag inclusion, crackle.

Embodiment 2

Press Diamond324L pipe silk component prescription, preparation filler alloys material.Adopt the prefabricated filler alloys powder of non-vacuum induction furnace melting atomization method, make through rolling drawing the tubulose alloy tube wire that diameter is Φ 3.2mm.The built-up welding of this alloy tube wire application and backing roll.

1, Diamond324L pipe silk composition (%)

C

Mn

Si

Cr

Mo

W

V

S

P

0.23

1.20

1.00

5.60

1.25

1.20

0.50

≤0.030

2, Diamond324L pipe silk overlay cladding composition (%)

C

Mn

Si

Cr

Mo

W

V

S

P

0.12

0.94

0.71

4.80

1.13

0.77

0.26

≤0.030

3, heap postwelding hardness (HS): 57;

4, bead-welding technology performance:

Embodiment 3

1, Diamond324L pipe silk composition (%)

C

Mn

Si

Cr

Mo

W

V

S

P

0.22

1.25

1.00

5.65

1.30

1.25

0.50

≤0.030

2, Diamond324L pipe silk overlay cladding composition (%)

C

Mn

Si

Cr

Mo

W

V

S

P

0.11

0.93

0.74

4.75

1.18

0.78

0.25

≤0.030

3, heap postwelding hardness (HS): 58;

4, bead-welding technology performance:

Embodiment 4

1, Diamond324L pipe silk composition (%)

C

Mn

Si

Cr

Mo

W

V

S

P

0.24

1.30

0.98

5.80

1.40

1.30

0.50

≤0.030

2, Diamond324L pipe silk overlay cladding composition (%)

C

Mn

Si

Cr

Mo

W

V

S

P

0.12

0.95

0.71

4.80

1.20

0.80

0.25

≤0.030

3, heap postwelding hardness (HS): 59;

4, bead-welding technology performance:

Embodiment 5,

1, Diamond324L pipe silk composition (%)

C

Mn

Si

Cr

Mo

W

V

S

P

0.23

1.35

1.00

5.90

1.30

1.20

0.50

≤0.030

2, Diamond324L pipe silk overlay cladding composition (%)

C

Mn

Si

Cr

Mo

W

V

S

P

0.11

0.98

0.74

5.00

1.50

1.14

0.26

≤0.030

3, heap postwelding hardness (HS): 57;

4, bead-welding technology performance:

Claims

1. a preparation method who adopts the backing roll alloy for surfacing pipe silk of prefabricated filler alloys powder making, is characterized in that concrete steps are as follows:

1) prefabricated filler alloys powder packing is entered in steel band, use steel band roll forming;

2), after rolling, be drawn into the flux cored wire of required diameter;

Wherein, described filler alloys powder is mainly by C, Mn, and Si, Cr, Mo, V, the composition of W seven elements, component formula is by weight percentage:

C ： 1.5-2.0%

Mn ： 8.5-10.5%

Si ： 1-1.6%

Cr ： 25-30%

Mo ： 3.5-4.5%

W ： 3.5-4.5%

V ： 0.8-1.6%

All the other are iron, and total amount is 100%.

2. the preparation method of the backing roll alloy for surfacing pipe silk that the prefabricated filler alloys powder of employing according to claim 1 is made, is characterized in that described filler alloys powder smelting technology is as follows:

Alternating voltage: 415 ~ 420V;

DC voltage: 400 ~ 415V;

DC current: 120 ~ 200A;

Voltage of intermediate frequency: 600 ~ 620V;

IF-FRE Hz:750 ~ 800 Hz;

Smelter flowsheet is:

Before blow-on, add whole iron, tungsten, carbon dust and vanadium, and half low-carbon (LC) chromium;

Indirect current:

Switch on 25 ~ 30 minutes time, add second half low-carbon (LC) chromium;

Energising 30 ~ 35 timesharing, add monocrystalline silicon;

Switch on 35 ~ 50 minutes time, add whole molybdenums;

Switch on 50 ~ 55 minutes time, add electrolytic manganese;

Switch on 55 ~ 60 minutes time, add silico-calcium, deoxidation;

Strengthen energising power: logical direct current 180 ~ 200A, heat 8 ~ 12 minutes, when furnace temperature rises to 1550 ℃ ~ 1600 ℃, have a power failure, open water under high pressure, hydraulic pressure is 90 ~ 110 atmospheric pressure, carries out hydraulic atomized cast, obtains water atomization alloyed powder.

3. the backing roll alloy for surfacing pipe silk being prepared by preparation method described in claim 1, is characterized in that the front compositions in weight percentage of filler alloys built-up welding is as follows:

C Mn Si Cr Mo W V S P 0.2-0.25 1.20-2.50 0.50-1.10 4.50-6.50 1.20-1.60 1.00-1.80 0.30-0.50 ≤0.030 ≤0.030

All the other are F e.