CN103341492A - Roller for rolling large profile steel and manufacturing technology of roller - Google Patents

Abstract

The invention discloses a roller for rolling large profile steel and a manufacturing technology of the roller. A base body of the roller for rolling the large profile steel contains evenly-distributed spheroidal graphite, and the base body is composed of granulous carbide, tempered sorbite and pearlite. When the roller for rolling the large profile steel rolls the large profile steel, the small graphite is crashed under the effect of squeezing, heating and the like, the effect of lubricant can be achieved during rolling material hole punching, the problem of steel sticking is solved, and the surface of a rolled piece is bright and clean.

Description

The roll and the production technology thereof that are used for rolling heavy section steel

Technical field

The present invention relates to a kind of roll for rolling heavy section steel and production technology thereof.

Background technology

The roll that is used for rolling heavy section steel (as large-scale I-steel, channel-section steel, U-shaped mining steel, sheet pile steel, angle steel, heavy rail finished frame etc.), adopt the spheroidal graphite cast-iron material at present mostly, often because pass is dark, the hardness drop is big, amount of rolling is low, few, the intensity difference of reconditioning number of times, easily produces rolling roll breakage work accident.The roll that adopts the AD180 half steel is also arranged, because of hardness between the 50-55 degree, pass Nei Changyin weares and teares the rough tiny pimple of inhomogeneous generation and influences service life when rolling, easily produces simultaneously glutinous steel because hardness is low, cause steel surface fineness coarse, can not meet the need of market.

Summary of the invention

First purpose of the present invention provides a kind of have high intensity, wearability and thermal fatigue resistance, the roll that is used for rolling heavy section steel of long service life.

The technical scheme that realizes first purpose of the present invention is: be used for the roll of rolling heavy section steel, contain equally distributed globular graphite in its matrix, and matrix be granular carbide, tempered sorbite, pearlite.

Its roll surface to deep hole bottom land Luo Cha ≦ 0.5 ~ 1.5 the degree.

Its roll neck Kang La Qiang Du ≧ 550MPa.

Second purpose of the present invention provides a kind of production technology of the roll for rolling heavy section steel, and the roll that adopts this technology to make has high intensity, wearability and thermal fatigue resistance.

The technical scheme that realizes second purpose of the present invention is: be used for the production technology of the roll of rolling heavy section steel, may further comprise the steps:

1. heat 80-100 ℃ on the basis of half steel liquidus temperature, and add 0.03% aluminium, through calm more than 10 minutes, make half steel liquid again;

2. add 0.60% BaCa nodulizer and 0.80% CaSi inovulant, and heat 40-60 ℃, make Si content increase by 0.90% again;

3. cast makes the polishing roll that contains 1.0-1.50% graphite.

The present invention has positive effect: the matrix of (1) roll for rolling heavy section steel of the present invention contains equally distributed globular graphite, during rolling heavy section steel, tiny graphite is in extruding and be subjected under the effect such as heating power broken, can play lubricant during the stocking perforation, solve glutinous steel problem, the rolled piece any surface finish is polished bright.

(2) roll surface of roll of the present invention to deep hole bottom land Luo Cha ≦ 0.5 ~ 1.5 the degree, this structure makes the hardness drop little and even.

(3) roll that makes of the production technology of the roll for rolling heavy section steel of the present invention, thermal fatigue resistance is strong, is difficult for producing be full of cracks, significantly improves amount of rolling, have high intensity, wearability and thermal fatigue resistance, reach 2 ~ 3 times of common roll service life.

Description of drawings

Content of the present invention is easier to be expressly understood in order to make, and according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation, wherein below

Fig. 1 is the structural representation of the roll for rolling heavy section steel of the present invention.

The specific embodiment

(embodiment 1)

See Fig. 1, the roll that is used for rolling heavy section steel of present embodiment contain equally distributed globular graphite in its matrix, and matrix is granular carbide, tempered sorbite, pearlite.

Its roll surface to deep hole bottom land Luo Cha ≦ 0.5 ~ 1.5 the degree, the hardness drop is little and even.Its roll neck Kang La Qiang Du ≧ 550MPa.

Tiny graphite can play lubricant during the stocking perforation in extruding be subjected under the effect such as heating power brokenly during rolling heavy section steel, solves glutinous steel problem, and the rolled piece any surface finish is polished bright.

The production technology of the roll that is used for rolling heavy section steel of present embodiment may further comprise the steps:

1. heat 80-100 ℃ on the basis of half steel liquidus temperature, and add 0.03% aluminium, through calm more than 10 minutes, make half steel liquid again.

2. add 0.60% BaCa nodulizer and 0.80% CaSi inovulant, and heat 40-60 ℃, make Si content increase by 0.90% again.

3. cast makes the polishing roll that contains 1.0-1.50% graphite.

The roll that adopts above-mentioned technology to make, detect demonstration through metallographic, it is spherical that graphite is, the nodulizing grade one-level, sphere diameter 4um, the graphite number is above 50, matrix is granular carbide+tempered sorbite+pearlite, carbon 1.80-2.20%, a spot of yttrium-base heavy rare earth, manganese, chromium, nickel element content all are not less than 1.0%.

Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (4)

1. be used for the roll of rolling heavy section steel, it is characterized in that: contain equally distributed globular graphite in its matrix, and matrix is granular carbide, tempered sorbite, pearlite.

2. the roll for rolling heavy section steel according to claim 1 is characterized in that: its roll surface to deep hole bottom land Luo Cha ≦ 0.5 ~ 1.5 degree.

3. the roll for rolling heavy section steel according to claim 1 is characterized in that: its roll neck Kang La Qiang Du ≧ 550MPa.

4. be used for the production technology of the roll of rolling heavy section steel, it is characterized in that: may further comprise the steps:

1. heat 80-100 ℃ on the basis of half steel liquidus temperature, and add 0.03% aluminium, through calm more than 10 minutes, make half steel liquid again;

2. add 0.60% BaCa nodulizer and 0.80% CaSi inovulant, and heat 40-60 ℃, make Si content increase by 0.90% again;

3. cast makes the polishing roll that contains 1.0-1.50% graphite.

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