CN102605232A - Nanometer alloy cast iron grinding ball and preparation method thereof - Google Patents

Abstract

The invention discloses a nanometer alloy cast iron grinding ball and a preparation method thereof. The nanometer alloy cast iron grinding ball comprises the raw materials in percentage by weight: 2.85-3.65% of C, 0.5-1.2% of Si, 0.7-1.5% of Mn, less than or equal to 0.01% of S, less than or equal to 0.01% of P, 1.0-3.0% of Cr and the balance of Fe. The preparation method comprises the steps of mixing and smelting the raw materials, then adding 0.02-0.03% of B4C and 0.05-0.12% of Re for fully mixing with molten steel, pouring into the cavity of a metal mold at 1300 DEG C-1350 DEG C, demolding and stamping at 1200 DEG C, conducting oil quenching, and tempering to obtain the finished product. According to the invention, the nanometer materials B4C and Re are evenly mixed with metal powder of materials of the cast iron grinding ball, so that the hardness and impact toughness of the cast iron grinding ball are improved, and the unit consumption of the grinding ball is reduced by 30%.

Description

A kind of Nanoalloy cast-iron grinding ball and preparation method thereof

Technical field

The present invention relates to a kind of Nanoalloy cast-iron grinding ball and preparation method thereof, belong to the ball mill part field.

Background technology

At present, in the metal melt of cast-iron grinding ball, add nano material, can roll up the number of nucleus in the melt, and partly become type nuclear core, make dense structure, grain refining; Simultaneously, the part nano particle becomes particle in metal melt, but because nano material crystal grain is tiny, directly adds the affiliation part and swim in the metal melt surface, can not reach homodisperse effect.

Summary of the invention

For hardness and the impelling strength that improves cast-iron grinding ball, thereby prolong abrading-ball work-ing life, the object of the present invention is to provide a kind of Nanoalloy cast-iron grinding ball and preparation method thereof.

The present invention adopts following technical scheme to achieve these goals:

The Nanoalloy cast-iron grinding ball is characterized in that the weight percent of its constitutive material is: C 2.85-3.65%, Si 0.5-1.2%, Mn 0.7-1.5%, S≤0.01%, P≤0.01%, Cr 1.0-3.0%, B ₄C 0.02-0.03%, Re 0.05-0.12%, all the other compositions are Fe.

The preparation method of described Nanoalloy cast-iron grinding ball is characterized in that may further comprise the steps:

(1) weight percent by constitutive material takes by weighing C, Si, Mn S, P, Cr and Fe, adds the medium-frequency induction furnace melting then, comes out of the stove to 1400 ℃-1450 ℃, puts into steel teeming ladle;

(2) weight percent by constitutive material takes by weighing B ₄C and Re add in the steel teeming ladle, and heating makes B ₄C and Re and molten steel thorough mixing, 1300 ℃-1350 ℃ are poured in the metal die die cavity, and 1200 ℃ go out forging dies, oil quenching, tempering obtains finished product, control oil quenching temperature>=850 ℃.

Beneficial effect of the present invention:

The present invention is with nano material B ₄The metal-powder uniform mixing of C and Re and cast-iron grinding ball material, thus the hardness and the impelling strength of cast-iron grinding ball improved, and the abrading-ball unit consumption descends 30%.

Embodiment

Embodiment 1: the Nanoalloy cast-iron grinding ball, the weight percent of its constitutive material is: C 2.85-3.65%, Si 0.5-1.2%, Mn 0.7-1.5%, S≤0.01%, P≤0.01%, Cr 1.0-3.0%, B ₄C 0.02-0.03%, Re 0.05-0.12%, all the other compositions are Fe.

The preparation method of Nanoalloy cast-iron grinding ball may further comprise the steps:

(1) weight percent by constitutive material takes by weighing C, Si, Mn S, P, Cr and Fe, adds the medium-frequency induction furnace melting then, comes out of the stove to 1400 ℃-1450 ℃, puts into steel teeming ladle;

(2) weight percent by constitutive material takes by weighing B ₄C and Re add in the steel teeming ladle, and heating makes B ₄C and Re and molten steel thorough mixing, 1300 ℃-1350 ℃ are poured in the metal die die cavity, and 1200 ℃ go out forging dies, oil quenching, tempering obtains finished product, control oil quenching temperature>=850 ℃.

Embodiment 2: Nanoalloy cast-iron grinding ball that the present invention makes and low-chromium cast-iron grinding ball performance comparison:

Performance index	Low-chromium cast-iron grinding ball	The Nanoalloy cast-iron grinding ball
			Hardness (HRC)	45～50	54～58
Impelling strength (J/cm 2)	≥1.5	≥3.5

Claims (2)

1. a Nanoalloy cast-iron grinding ball is characterized in that the weight percent of its constitutive material is: C 2.85-3.65%, Si 0.5-1.2%, Mn 0.7-1.5%, S≤0.01%, P≤0.01%, Cr 1.0-3.0%, B ₄C 0.02-0.03%, Re 0.05-0.12%, all the other compositions are Fe.

2. the preparation method of a Nanoalloy cast-iron grinding ball as claimed in claim 1 is characterized in that may further comprise the steps:

(1) weight percent by constitutive material takes by weighing C, Si, Mn S, P, Cr and Fe, adds the medium-frequency induction furnace melting then, comes out of the stove to 1400 ℃-1450 ℃, puts into steel teeming ladle;

(2) weight percent by constitutive material takes by weighing B ₄C and Re add in the steel teeming ladle, and heating makes B ₄C and Re and molten steel thorough mixing, 1300 ℃-1350 ℃ are poured in the metal die die cavity, and 1200 ℃ go out forging dies, oil quenching, tempering obtains finished product, control oil quenching temperature>=850 ℃.