CN104195469A - Alloy steel for automobile brake disc and manufacturing method for alloy steel - Google Patents

Abstract

The invention discloses alloy steel for an automobile brake disc and a manufacturing method for the alloy steel. The alloy steel comprises the following chemical element components in percentage by weight: 0.06-0.07% of carbon, 0.6-0.8% of silicon, 0.04-0.05% of manganese, 0.08-0.09% of vanadium, 0.004-0.005% of tungsten, 0.2-0.5% of titanium, 0.02-0.08% of aluminum, 0.05-0.09% of copper, 0.4-0.6% of zirconium, 0.03-0.035% of lanthanum, 0.042-0.048% of cerium, 0.01-0.02% of yttrium, 0.023-0.035% of erbium, 0.4-0.5% of bismuth, 0.1-0.2% of sulfur, 0.03-0.032% of phosphor and the balance of iron. The alloy steel adopts a preferential alloy formula, has relatively high mechanical strength and thermal fatigue resistance, also has relatively good thermal crack resistance, stable frictional performance and good thermal conductivity, and is especially suitable for manufacturing rail transit vehicles. A plurality of alloy elements such as zirconium, cerium, yttrium and lanthanide-series elements are added in the formula, and the manufactured alloy has light weight, high hardness, good glossiness and strong impact resistance.

Description

A kind of automobile brake disc steel alloy and manufacture method thereof

 

Technical field

The present invention relates to a kind of steel alloy and manufacture method thereof, particularly the manufacture method of steel alloy for a kind of automobile brake disc.

 

Background technology

The metal kit of automobile not only has higher requirement in structural strength and function, no less important in mechanical workout simultaneously, and such requirement is not only and is met the primary condition that automobile uses, and is also the safe and reliable guarantee increasing the service life simultaneously.

In prior art, producing the steel of auto parts machinery is common middle low levels steel alloy, and because these automobile metal accessories are generally moving partss frequently using in function, wear rate is very high, changes frequently, has increased maintenance cost; Search out a kind of hardness and wear resisting property of improving, it is extremely important that the steel alloy of the middle low levels that piece surface resistance toheat is high simultaneously just shows.

 

Summary of the invention

The object of the present invention is to provide the manufacture method of a kind of automobile brake disc steel alloy.

The present invention adopts following technical scheme:

Automobile brake disc steel alloy, chemical element composition and mass percent thereof that it contains are: carbon 0.06-0.07%, silicon 0.6-0.8%, manganese 0.04-0.05%, vanadium 0.08-0.09%, tungsten 0.004-0.005%, titanium 0.2-0.5%, aluminium 0.02-0.08%, copper 0.05-0.09%, zirconium 0.4-0.6%, lanthanum 0.03-0.035%, cerium 0.042-0.048%, yttrium 0.01-0.02%, bait 0.023-0.035%, bismuth 0.4-0.5%, sulphur 0.1-0.2%, phosphorus 0.03-0.032%, surplus are iron.

The manufacture method of steel alloy for automobile brake disc, comprises the following steps:

(1) batching: in steel alloy mass percent, by following chemical composition batching, zirconium 0.4-0.6%, lanthanum 0.03-0.035%, cerium 0.042-0.048%, yttrium 0.01-0.02%, bait 0.023-0.035%, bismuth 0.4-0.5%, put into smelting furnace melting, be incubated after 20-30 minute, continue melting 1-2h, tapping temperature is 1350 DEG C-1380 DEG C; Then pour into alloy block 1, take out air cooling for subsequent use;

(2) take manganese powder, vanadium powder, tungsten powder, titanium valve, aluminium powder and copper powder by the mass percent of chemical element composition; Fully mix, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 8-10Mpa pressure, be pressed into bulk, then under nitrogen protection atmosphere 600-650 DEG C carry out sintering 8-10 hour, by crossing 200-400 mesh sieve after the crushing material after sintering, for subsequent use;

(3) by steel scrap, ferrosilicon, ferrochrome and ferromanganese mix by equal proportion, add again scrap iron, after adjusting its carbon content with barren rock electrode ink or the pig iron, put into electric furnace, molten steel fusing, after stokehold adjusting component is qualified, temperature is risen to 1400-1450 DEG C, add again the alloy block of step (1) and the standby material of step (2), after melting is uniformly mixed, add other residue alloying elements by constitutive material mass percent wherein again, insulation 20-30 minute, at 1480-1550 DEG C of refining 50-60min, after insulation 20-30min, sample, after analysis ingredient, adjusting component, fusing 20-25min, casting, tapping temperature is 1450-1480 DEG C,

(4) thermal treatment: the foundry goods of step (3) casting is first heated to 1150-1200 DEG C and quenches, then 600-650 DEG C of insulation 2-3 hour, 750-800 DEG C of insulation 1-2 hour, 800-850 DEG C of insulation 1-2 hour, then use 380 DEG C of-450 DEG C of tempering, the time is controlled at 4-5 hour.

Beneficial effect of the present invention:

The present invention adopts preferred alloy formula, there is higher physical strength and thermal fatigue resistance, also there is good hot-cracking resistance, stable frictional behaviour and good thermal conductivity simultaneously, especially be suitable for manufacturing for rail traffic vehicles, the present invention has added the multiple alloying element of zirconium, cerium, yttrium and lanthanon in formula, and the alloy mass making is light, and hardness is high, glossiness is good, and shock resistance is strong.

 

Embodiment

Embodiment 1: automobile brake disc steel alloy, chemical element composition and mass percent thereof that it contains are: carbon 0.065%, silicon 0.7%, manganese 0.045%, vanadium 0.085%, tungsten 0.004%, titanium 0.3%, aluminium 0.05%, copper 0.08%, zirconium 0.5%, lanthanum 0.033%, cerium 0.045%, yttrium 0.015%, bait 0.03%, bismuth 0.45%, sulphur 0.15%, phosphorus 0.032%, surplus are iron.

The manufacture method of steel alloy for automobile brake disc, comprises the following steps:

(1) batching: in steel alloy mass percent, by following chemical composition batching, zirconium 0.5%, lanthanum 0.033%, cerium 0.045%, yttrium 0.015%, bait 0.03%, bismuth 0.45%, put into smelting furnace melting, be incubated after 20-30 minute, continue melting 1-2h, tapping temperature is 1380 DEG C; Then pour into alloy block 1, take out air cooling for subsequent use;

(2) take manganese powder, vanadium powder, tungsten powder, titanium valve, aluminium powder and copper powder by the mass percent of chemical element composition; Fully mix, add in suitable quantity of water, send into ball milling in ball mill, obtain 400 order powder, then, spraying is dry, oven dry, under 8-10Mpa pressure, be pressed into bulk, then under nitrogen protection atmosphere 620 DEG C carry out sintering 8-10 hour, by crossing 200-400 mesh sieve after the crushing material after sintering, for subsequent use;

(3) by steel scrap, ferrosilicon, ferrochrome and ferromanganese mix by equal proportion, add again scrap iron, after adjusting its carbon content with barren rock electrode ink or the pig iron, put into electric furnace, molten steel fusing, after stokehold adjusting component is qualified, temperature is risen to 1420 DEG C, add again the alloy block of step (1) and the standby material of step (2), after melting is uniformly mixed, add other residue alloying elements by constitutive material mass percent wherein again, insulation 20-30 minute, at 1480-1550 DEG C of refining 50-60min, after insulation 20-30min, sample, after analysis ingredient, adjusting component, fusing 20-25min, casting, tapping temperature is 1450-1480 DEG C,

(4) thermal treatment: the foundry goods of step (3) casting is first heated to 1180 DEG C and quenches, then 620 DEG C of insulation 2-3 hour, 780 DEG C of insulation 1-2 hour, 820 DEG C of insulation 1-2 hour, then use 420 DEG C of tempering, and the time is controlled at 4-5 hour.

The present invention manufacture alloy steel material testing data: tensile strength sigma b>=1410MPa; Yield strength σ _0.2>=1235MPa; Low-temperature impact toughness σ ku (40 DEG C)>=37.5J/cm ²; Hardness HRC 61-63.

Claims (2)

1. an automobile brake disc steel alloy, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.06-0.07%, silicon 0.6-0.8%, manganese 0.04-0.05%, vanadium 0.08-0.09%, tungsten 0.004-0.005%, titanium 0.2-0.5%, aluminium 0.02-0.08%, copper 0.05-0.09%, zirconium 0.4-0.6%, lanthanum 0.03-0.035%, cerium 0.042-0.048%, yttrium 0.01-0.02%, bait 0.023-0.035%, bismuth 0.4-0.5%, sulphur 0.1-0.2%, phosphorus 0.03-0.032%, surplus are iron.

2. a manufacture method for steel alloy for automobile brake disc as claimed in claim 1, is characterized in that comprising the following steps:

(1) batching: in steel alloy mass percent, by following chemical composition batching, zirconium 0.4-0.6%, lanthanum 0.03-0.035%, cerium 0.042-0.048%, yttrium 0.01-0.02%, bait 0.023-0.035%, bismuth 0.4-0.5%, put into smelting furnace melting, be incubated after 20-30 minute, continue melting 1-2h, tapping temperature is 1350 DEG C-1380 DEG C; Then pour into alloy block 1, take out air cooling for subsequent use;

(2) take manganese powder, vanadium powder, tungsten powder, titanium valve, aluminium powder and copper powder by the mass percent of chemical element composition; Fully mix, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 8-10Mpa pressure, be pressed into bulk, then under nitrogen protection atmosphere 600-650 DEG C carry out sintering 8-10 hour, by crossing 200-400 mesh sieve after the crushing material after sintering, for subsequent use;

(3) by steel scrap, ferrosilicon, ferrochrome and ferromanganese mix by equal proportion, add again scrap iron, after adjusting its carbon content with barren rock electrode ink or the pig iron, put into electric furnace, molten steel fusing, after stokehold adjusting component is qualified, temperature is risen to 1400-1450 DEG C, add again the alloy block of step (1) and the standby material of step (2), after melting is uniformly mixed, add other residue alloying elements by constitutive material mass percent wherein again, insulation 20-30 minute, at 1480-1550 DEG C of refining 50-60min, after insulation 20-30min, sample, after analysis ingredient, adjusting component, fusing 20-25min, casting, tapping temperature is 1450-1480 DEG C,

(4) thermal treatment: the foundry goods of step (3) casting is first heated to 1150-1200 DEG C and quenches, then 600-650 DEG C of insulation 2-3 hour, 750-800 DEG C of insulation 1-2 hour, 800-850 DEG C of insulation 1-2 hour, then use 380 DEG C of-450 DEG C of tempering, the time is controlled at 4-5 hour.