CN1064566C - Centrifugal casting method for producing composite high-speed steel rollers - Google Patents
Centrifugal casting method for producing composite high-speed steel rollers Download PDFInfo
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- CN1064566C CN1064566C CN97100083A CN97100083A CN1064566C CN 1064566 C CN1064566 C CN 1064566C CN 97100083 A CN97100083 A CN 97100083A CN 97100083 A CN97100083 A CN 97100083A CN 1064566 C CN1064566 C CN 1064566C
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Abstract
The present invention relates to a centrifugal method for producing composite high speed steel rollers. The present invention is mainly characterized in that the material of the outer layer of a roller is high speed steel; the material of the core part of the roller is alloy nodular cast iron; the two different kinds of material are compounded in a centrifugal casting mode to form the roller. Before molten steel in the outer layer is cast, rare earth is added, and the modification is carried out. 0.03 to 0.5% of the rare earth is added. Simultaneously, after the molten steel in the outer layer is cast, a protecting agent is added for protection, the protecting agent prevents the inner surface of the outer layer from being oxidized, and 3 to 5 kg/m<2> of the protecting agent is added. The cast temperature of the molten steel in the outer layer is 1400 to 1550 DEG C, and the cast temperature of molten iron in the core part is 1350 to 1450 DEG C. The present invention has the advantages that the production cost is low, the service life of the roller produced according to the present invention is long, etc. The present invention is suitable for the centrifugal composite production of high speed steel rollers.
Description
The invention belongs to the high-speed steel roll manufacturing technology, mainly be applicable to the centrifugal compound manufacturing of the high-speed steel roll that the steel rolling industry is required.
High-speed steel roll is neoteric in recent years a kind of new roller, and its sphere of action is not only applicable to the cold and hot working roll that rolls of strip-mill strip, but also is applicable to the working roll of various bar and shape mills, has the prospect of using widely.The production method of centrifugal composite high-speed steel roller is compared with continuous casting composite algorithm, electroslag remelting process and high temperature insostatic pressing (HIP) method, has advantages such as equipment investment is few, production cost is low, method of operating is easy, constant product quality.This production method at first is that the molten steel with skin of the roll pours in the centrifuge casting mold with certain rotation speed; intact back adds special protective agent protection at outer field inner surface; when outer molten steel has just solidified; pour into the alloy nodular cast iron molten iron of core again, make the material of two kinds of different performances reach metallurgical binding completely.To guarantee on the one hand and solidify skin to reach whole metallurgical binding for pouring into of core molten iron, to reduce as far as possible on the other hand solidifying outer field fusing, cause the reduction of roller neck intensity to prevent final core alloy too high levels, on combination process, to control especially simultaneously, cause the reduction of binder course intensity with the diffusion that reduces the binder course alloy.
In the production method of existing centrifugal composite high-speed steel roller, although the alloy content of skin of the roll is enough high, but the netted eutectic carbide amount of as cast condition is a lot, both made by heat treatment and also be difficult to all eliminate, cause reduce greatly the service life of roll, and core of the roll material employing steel alloy, the manufacturing cost costliness is as Japan Patent JP157571.
Patent CN1070600A discloses a kind of production method of centrifugally compounded nodular graphite cast iron roller; Its skin and core material are spheroidal graphite cast-iron, do not realize that cladding material is a high-speed steel, and core material is the purpose of spheroidal graphite cast-iron.
The object of the present invention is to provide a kind of production cost low, simple to operate, the production method of the centrifugal composite high-speed steel roller of long service life.
In order to achieve the above object, the present invention has adopted following major technique measure:
(1) outer material of roll adopts high-speed steel, and the core of the roll material adopts alloy nodular cast iron.
The chemical composition of skin of the roll molten steel (weight %) is: C1.2-2.5%, Si0.3-1.5%, Mn0.4-1.0%, Ni＜1.5%, Cr3.0-8.0%, Mo2.0-7.0%, V2.0-7.0%, W1.0-5.0%, RE0.01-0.5%, P＜0.05%, S＜0.05%, surplus is Fe.
The chemical composition of core of the roll molten iron (weight %) is: C3.0-3.8%, and Si2.2-3.2%, Mn0.3-0.8%, Ni0.2-2.0%, Mg0.03-0.1%, RE＞0.03%, P＜0.1%, S＜0.03%, surplus is Fe.
(2) outer molten steel adopts rare earth processings of go bad, and the core molten iron adopts rare earth-Si-Fe-Mg and ferrosilicon powder to carry out nodularization and inoculation, and the core molten iron adopts a certain amount of instant inoculation to spread and the influence that causes to core with the elimination outer layer alloys simultaneously.
(3) skin of the roll high-speed steel and core alloy spheroidal graphite cast-iron adopt centrifugal casting to be composited, to reach complete metallurgical binding.
(4) behind outer pouring molten steel, add a kind of protective agent outer inner surface is protected, in case oxidation, this protective agent is the disclosed centrifugal casting molten-slag of ZL92105533.1, described protectant addition is 3-5kg/m
2
(5) roll will be heat-treated before fine finishining, makes outer tissue obtain granular carbide and tempered martensite.
The centrifugal recombination process of roll is as follows: at first skin of the roll molten steel and core molten iron are smelted respectively in two electric furnaces; the skin of the roll molten steel adopts the rotten processing of rare earth; the addition of rare earth is that molten steel amount (weight %) is 0.03～0.5%; outer molten steel after rotten the processing is poured in the centrifuge casting mold with certain rotation speed; outer pouring molten steel temperature is 1400～1550 ℃; the temperature of casting mold is 50～250 ℃ during cast; the paint thickness of casting mold is 1-5mm; after outer molten steel has watered; add a kind of protective agent protection at outer field inner surface; described protective agent is the disclosed centrifugal casting molten-slag of ZL92105533.1, and protectant addition is 3～5KG/m
2Behind outer molten steel solidification, pour into the core molten iron again, when tapping a blast furnace, described core molten iron carries out nodularization and inoculation with rare earth-Si-Fe-Mg and ferrosilicon powder, the addition of rare earth-Si-Fe-Mg is the 1.0-2.5% of molten iron total amount (weight %), the addition of ferrosilicon powder is the 0.3-1.0% of molten iron total amount (weight %), the core molten iron adopts ferrosilicon powder to carry out instant inoculation when cast and handles, the addition of described ferrosilicon powder is 0.05～0.3% of a core molten iron total amount (weight %), the pouring temperature of core molten iron is 1350～1450 ℃, makes two kinds of different metals reach metallurgical binding completely.
Compared with prior art, the present invention has following advantage:
(1) outer molten steel adopts the rare earth processing of go bad, and the centrifugal composite high-speed steel roller of core employing alloy nodular cast iron has that equipment investment is few, and production cost is low, advantages such as the easy and constant product quality of method of operating.
(2) owing to the formation of granular and thin massive carbide, not only wearability is good to make roll, and toughness also improves greatly.
(3) roll is used for the strip-mill strip working roll and compares with existing high nickel chromium triangle infinitely chilled ductile cast iron roll and can improve 3-4 service life doubly, is used for bar and shape mill and compares with existing roll, can improve 2-3 service life doubly.
(4) this kind roll can replace the carbon tungsten roller ring of high-speed rod-rolling mill finish rolling leading portion.Reduce production costs greatly.
(5) owing to the roll raising in service life, reduced the roll change number of times, the operating rate of milling train is significantly improved.
Embodiment
Adopt the production method of centrifugal composite high-speed steel roller of the present invention, manufacture experimently three batches of rolls, the chemical composition of the three batches of skin of the roll molten steel and core molten iron is as shown in table 1, and centrifugal combination process parameter is as shown in table 2.
The three batches of rolls are respectively applied for the mill coil milling train and high rod-rolling mill gives finishing stand, and the steel rolling amount is as follows altogether:
The high NiCrMo indefinite chill roll of former employing, access times are about 10 times, the steel rolling amount is about 3000 tons altogether.Now adopt the total steel rolling amount of embodiment A and B to reach 12000 and 12500 tons.The high NiCrMo indefinite chill roll of former employing, the steel amount is about 13000 tons altogether, now adopting the total steel rolling amount of Embodiment C is 35000 tons.
Table 1 embodiment skin of the roll and core chemical composition (Wt%)
| Classification | The position | Chemical composition (Wt%) | |||||||||||
| C | Si | Mn | P | S | W | Cr | Mo | V | Ni | RE | Mg | ||
| A | Outer | 2.35 | 1.41 | 0.85 | 0.049 | 0.042 | 1.46 | 4.05 | 2.25 | 2.46 | 0.24 | 0.029 | / |
| Core | 3.46 | 2.57 | 0.52 | 0.043 | 0.026 | / | / | / | / | 0.49 | 0.047 | 0.042 | |
| B | Outer | 1.25 | 0.48 | 0.41 | 0.031 | 0.036 | 4.82 | 6.86 | 6.45 | 5.93 | 1.47 | 0.043 | / |
| Core | 3.53 | 2.82 | 0.48 | 0.046 | 0.017 | / | / | / | / | 0.96 | 0.036 | 0.056 | |
| C | Outer | 1.96 | 0.78 | 0.65 | 0.041 | 0.035 | 2.25 | 5.12 | 4.06 | 4.93 | 0.58 | 0.063 | / |
| Core | 3.49 | 2.75 | 0.66 | 0.038 | 0.021 | / | / | / | / | 1.50 | 0.041 | 0.044 | |
The centrifugal combination process parameter of table 2 embodiment
| Classification | Barrel diameter mm | Outer pouring molten steel temperature ℃ | Core molten steel pouring temperature ℃ | Outer rare earth adding quantity % | Water injection molding temperature ℃ | Paint thickness mm |
| A | φ300 | 1520℃ | 1380℃ | 0．15 | 230℃ | 2．5 |
| B | φ310 | 1540℃ | 1430℃ | 0．10 | 170℃ | 1．5 |
| C | φ310 | 1470℃ | 1400℃ | 0．30 | 180℃ | 1．5 |
Claims (1)
1, a kind of production method of centrifugal composite high-speed steel roller, the outer molten steel of handling that at first will go bad pours in the centrifuge casting mold with certain rotation speed, the pouring temperature of outer molten steel is 1400-1550 ℃, the temperature of casting mold is 50-250 ℃ during cast, behind outer molten steel solidification, pour into the core molten iron again, the pouring temperature of core molten iron is 1350-1450 ℃, it is characterized in that:
(1) cladding material of centrifugal compound roll is a high-speed steel, and the core material of roll is an alloy nodular cast iron;
(2) chemical composition of the outer high-speed steel of centrifugal compound roll (weight %) is; C1.2-2.5%, Si0.3-1.5%, Mn0.4-1.0%, Ni＜3.0%, Cr3.0-8.0%, Mo2.0-7.0%, V2.0-7.0%, W1.0-5.0%, RE0.01-0.5%, P＜0.05%, S＜0.05%, surplus is Fe.
(3) the outer high-speed steel of centrifugal compound roll adopts the rare earth processing of going bad, and the addition of rare earth is the 0.03-0.5% of molten steel amount (weight %);
(4) behind outer pouring molten steel, adding a kind of protective agent is the disclosed centrifugal casting molten-slag of ZL92105533.1, and outer inner surface is protected, and described protectant addition is 3-5kg/m
2
Carry out nodularization and inoculation with rare earth-Si-Fe-Mg and ferrosilicon powder when (5) described core molten iron taps a blast furnace, the addition of rare earth-Si-Fe-Mg is the 1.0-2.5% of molten iron total amount (weight %), and the addition of ferrosilicon powder is the 0.3-1.0% of molten iron total amount (weight %).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100083A CN1064566C (en) | 1997-02-24 | 1997-02-24 | Centrifugal casting method for producing composite high-speed steel rollers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97100083A CN1064566C (en) | 1997-02-24 | 1997-02-24 | Centrifugal casting method for producing composite high-speed steel rollers |
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| Publication Number | Publication Date |
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| CN1179368A CN1179368A (en) | 1998-04-22 |
| CN1064566C true CN1064566C (en) | 2001-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN97100083A Expired - Fee Related CN1064566C (en) | 1997-02-24 | 1997-02-24 | Centrifugal casting method for producing composite high-speed steel rollers |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392138C (en) * | 2006-05-28 | 2008-06-04 | 江苏共昌轧辊有限公司 | Half high speed steel composite roller and preparation process thereof |
| CN100404152C (en) * | 2005-09-13 | 2008-07-23 | 安泰科技股份有限公司 | High speed steel composite roll and its preparing method |
| CN108907149A (en) * | 2018-07-06 | 2018-11-30 | 莱芜莱钢集团金鼎轧辊有限公司 | A kind of duplex composite roll pouring procedure |
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| CN100594075C (en) * | 2005-04-20 | 2010-03-17 | 江苏共昌轧辊有限公司 | Composite high-speed steel roller and production thereof |
| CN1331626C (en) * | 2006-01-19 | 2007-08-15 | 郑州航空工业管理学院 | Low crack type high speed steel roll and its centrifugal casting method |
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| CN103409688B (en) * | 2013-07-10 | 2015-07-15 | 中钢集团邢台机械轧辊有限公司 | Large forged high-speed steel cold roll and manufacturing method thereof |
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| CN110125370B (en) * | 2019-05-27 | 2021-02-19 | 鞍钢重型机械有限责任公司 | Manufacturing method of heat-resistant composite roller for ultrathin cast-rolling strip steel rolling mill |
| CN112831718B (en) * | 2020-12-29 | 2022-09-23 | 中钢集团邢台机械轧辊有限公司 | Hot continuous rolling two-roller rough rolling working roller and preparation method thereof |
| CN115430820B (en) * | 2022-09-28 | 2024-06-18 | 河北津西钢铁集团重工科技有限公司 | Method for centrifugally casting cast iron roller sleeve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069074A (en) * | 1992-07-30 | 1993-02-17 | 冶金工业部钢铁研究总院 | Spheroidizing method for centrifugal casting compounded roller |
| CN1070600A (en) * | 1992-08-24 | 1993-04-07 | 冶金工业部钢铁研究总院 | The production method of centrifugally compounded nodular graphite cast iron roller |
| CN1077401A (en) * | 1993-02-27 | 1993-10-20 | 鞍山钢铁公司 | Composite cast iron roller and casting method thereof |
-
1997
- 1997-02-24 CN CN97100083A patent/CN1064566C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069074A (en) * | 1992-07-30 | 1993-02-17 | 冶金工业部钢铁研究总院 | Spheroidizing method for centrifugal casting compounded roller |
| CN1070600A (en) * | 1992-08-24 | 1993-04-07 | 冶金工业部钢铁研究总院 | The production method of centrifugally compounded nodular graphite cast iron roller |
| CN1077401A (en) * | 1993-02-27 | 1993-10-20 | 鞍山钢铁公司 | Composite cast iron roller and casting method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100404152C (en) * | 2005-09-13 | 2008-07-23 | 安泰科技股份有限公司 | High speed steel composite roll and its preparing method |
| CN100392138C (en) * | 2006-05-28 | 2008-06-04 | 江苏共昌轧辊有限公司 | Half high speed steel composite roller and preparation process thereof |
| CN108907149A (en) * | 2018-07-06 | 2018-11-30 | 莱芜莱钢集团金鼎轧辊有限公司 | A kind of duplex composite roll pouring procedure |
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| Publication number | Publication date |
|---|---|
| CN1179368A (en) | 1998-04-22 |
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