CN104195464A - High chrome alloy steel for mine and manufacturing method thereof - Google Patents

Abstract

The invention discloses high chrome alloy steel for a mine and a manufacturing method of the high chrome alloy steel. Chemical element components of the steel comprise, by mass, 0.2 percent to 0.65 percent of carbon, 0.02 percent to 0.06 percent of silicon, 0.06 percent to 0.08 percent of manganese, 1.0 percent to 1.2 percent of chromium, 0.045 percent to 0.055 percent of neodymium, 0.08 percent to 0.09 percent of boron, tin smaller than or equal to 0.002 percent, 0.003 percent to 0.004 percent of rubidium, 0.01 percent to 0.035 percent of aluminum, 0.02 percent to 0.04 percent of zirconium, magnesium smaller than or equal to 0.08 percent, 0.04 percent to 0.05 percent of sulphur, 0.02 percent to 0.03 percent of phosphorus, and the balance iron. The low-carbon high chrome alloy is adopted to be used as a material, and the steel has the good toughness; meanwhile, due to the fact that the steel contains multiple alloy elements such as boron, tin, rubidium, zirconium and magnesium, the higher hardness and abrasive resistance are achieved, and especially the steel has the advantage of being resistant to high temperature. A crystal interface of a thinned alloy steel material becomes complex, the breaking strength is increased, the impact toughness is obviously improved, and the impact toughness of the manufactured steel is improved by 30 percent to 40 percent compared with that of an existing product.

Description

High Chrome Alloy Steel and manufacture method thereof for a kind of mine

Technical field

The present invention relates to a kind of steel alloy and manufacture method thereof, particularly the manufacture method of High Chrome Alloy Steel for a kind of mine.

Background technology

Mine is a lot of by the kind of hammer head material, the most frequently used is high mangaenese steel, be at first because of its hardness and wear resistance all higher, but it is found that now that actually this is not so, some occasion high mangaenese steel tup is not wear-resisting, and work-ing life is short, traces it to its cause, that high mangaenese steel will be in the situation that large surging force could produce the cementation zone of high rigidity, and not wear-resisting in the little situation of surging force; Also have Medium Manganese Steel tup, because it has higher hardness and toughness, more durable in the situation that surging force is not too large, and be magnetic; Rich chromium cast iron tup has good wear resistance, but toughness is poor, and brittle rupture easily occurs.Various materials all can not reach optimal effect, so the material of reasonable, develop simple and practical technique, are guaranteeing saving resource and the energy under the prerequisite of service requirements, have become focus and the difficult point in high-abrasive material field.

Summary of the invention

The object of the present invention is to provide the manufacture method of High Chrome Alloy Steel for a kind of mine.

The present invention adopts following technical scheme:

Mine High Chrome Alloy Steel, chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.65%, silicon 0.02-0.06%, manganese 0.06-0.08%, chromium 1.0-1.2%, neodymium 0.045-0.055%, boron 0.08-0.09%, tin≤0.002%, rubidium 0.003-0.004%, aluminium 0.01-0.035%, zirconium 0.02-0.04%, magnesium≤0.08%, sulphur 0.04-0.05%, phosphorus 0.02-0.03%, surplus are iron.

The manufacture method of High Chrome Alloy Steel for mine, comprises the following steps:

(1) batching: in steel alloy mass percent, by following chemical composition batching, neodymium 0.045-0.055%, boron 0.08-0.09%, tin≤0.002%, rubidium 0.003-0.004%, zirconium 0.02-0.04%, magnesium≤0.08%, put into smelting furnace melting, be incubated after 30-40 minute, continue melting 1-2h, tapping temperature is 1250 ℃-1380 ℃; Then pour into alloy block, take out air cooling standby;

(2) by the mass percent of chemical element composition, take Graphite Powder 99, manganese powder, chromium powder and aluminium powder; 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 ℃ carry out sintering 8-10 hour, by crossing 200-400 mesh sieve after the crushing material after sintering, standby;

(3) steel scrap and the pig iron are mixed by equal proportion, be smelted into molten steel, temperature is risen to 1350-1550 ℃, add again the alloy block of step (1) and the standby material of step (2), after melting is uniformly mixed, then by constitutive material mass percent, add other residue alloying elements, insulation 20-30 minute wherein, then sampling, after analysis ingredient, adjusting component, fusing 18-25min, casting, tapping temperature is 1220-1480 ℃;

(4) thermal treatment: by the foundry goods air cooling of step (3) casting to room temperature, then from room temperature, be heated to 350-400 ℃, time is 2-3 hour, insulation 1-2 hour, be warming up to 600-650 ℃, the time is 2-3 hour again, insulation 30-50 minute, be warming up to 1000-1200 ℃, the time is 3-4 hour again; Insulation 3-3.5 hour, last oil cooling; Low-temperaturetempering: be heated to 300-350 ℃, be incubated air cooling after 4-5 hour.

Beneficial effect of the present invention:

The present invention adopts low-carbon (LC) high chromium steel as material, has good toughness; Meanwhile, because of it, contain again the multiple alloying elements such as boron, tin, rubidium, zirconium and magnesium, there is high hardness and wear resistance, especially there is resistant to elevated temperatures feature; Alloy steel material of the present invention crystal interface after refinement complicates, and breaking tenacity increases, and toughness significantly promotes, and the toughness that makes product is compared raising 30-40% with currently available products.

Embodiment

Embodiment 1: mine High Chrome Alloy Steel, chemical element composition and mass percent thereof that it contains are: carbon 0.4%, silicon 0.04%, manganese 0.07%, chromium 1.1%, neodymium 0.05%, boron 0.085%, tin≤0.002%, rubidium 0.0035%, aluminium 0.02%, zirconium 0.03%, magnesium≤0.08%, sulphur 0.045%, phosphorus 0.025%, surplus are iron.

The manufacture method of High Chrome Alloy Steel for mine, comprises the following steps:

(1) batching: in steel alloy mass percent, by following chemical composition batching, neodymium 0.05%, boron 0.085%, tin≤0.002%, rubidium 0.0035%, zirconium 0.03%, magnesium≤0.08%, put into smelting furnace melting, be incubated after 35 minutes, continue melting 1-2h, tapping temperature is 1300 ℃; Then pour into alloy block, take out air cooling standby;

(2) by the mass percent of chemical element composition, take Graphite Powder 99, manganese powder, chromium powder and aluminium powder; Fully mix, add in suitable quantity of water, send into ball milling in ball mill, obtain 300 order powder, then, spraying is dry, oven dry, under 8-10Mpa pressure, be pressed into bulk, then under nitrogen protection atmosphere 620 ℃ carry out sintering 8-10 hour, by crossing 300 mesh sieves after the crushing material after sintering, standby;

(3) steel scrap and the pig iron are mixed by equal proportion, be smelted into molten steel, temperature is risen to 1450 ℃, add again the alloy block of step (1) and the standby material of step (2), after melting is uniformly mixed, then by constitutive material mass percent, add other residue alloying elements wherein, be incubated 25 minutes, then sampling, after analysis ingredient, adjusting component, fusing 20min, casting, tapping temperature is 1450 ℃;

(4) thermal treatment: the foundry goods air cooling of step (3) casting, to room temperature, is then heated to 380 ℃ from room temperature, and the time is 2.5 hours, be incubated 1.5 hours, then be warming up to 620 ℃, the time is 2.5 hours, be incubated 40 minutes, then be warming up to 1100 ℃, the time is 3.5 hours; Be incubated 3 hours, last oil cooling; Low-temperaturetempering: be heated to 320 ℃, be incubated air cooling after 4.5 hours.

The present invention manufacture alloy steel material testing data: tensile strength sigma b>=1232MPa; Yield strength σ _0.2>=1025MPa; Low-temperature impact toughness σ ku (40 ℃)>=39.5J/cm ²; Hardness HRC 62-68.

Claims (2)

1. a mine High Chrome Alloy Steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.65%, silicon 0.02-0.06%, manganese 0.06-0.08%, chromium 1.0-1.2%, neodymium 0.045-0.055%, boron 0.08-0.09%, tin≤0.002%, rubidium 0.003-0.004%, aluminium 0.01-0.035%, zirconium 0.02-0.04%, magnesium≤0.08%, sulphur 0.04-0.05%, phosphorus 0.02-0.03%, surplus are iron.

2. a manufacture method for High Chrome Alloy Steel for mine 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, neodymium 0.045-0.055%, boron 0.08-0.09%, tin≤0.002%, rubidium 0.003-0.004%, zirconium 0.02-0.04%, magnesium≤0.08%, put into smelting furnace melting, be incubated after 30-40 minute, continue melting 1-2h, tapping temperature is 1250 ℃-1380 ℃; Then pour into alloy block, take out air cooling standby;

(2) by the mass percent of chemical element composition, take Graphite Powder 99, manganese powder, chromium powder and aluminium powder; 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 ℃ carry out sintering 8-10 hour, by crossing 200-400 mesh sieve after the crushing material after sintering, standby;

(3) steel scrap and the pig iron are mixed by equal proportion, be smelted into molten steel, temperature is risen to 1350-1550 ℃, add again the alloy block of step (1) and the standby material of step (2), after melting is uniformly mixed, then by constitutive material mass percent, add other residue alloying elements, insulation 20-30 minute wherein, then sampling, after analysis ingredient, adjusting component, fusing 18-25min, casting, tapping temperature is 1220-1480 ℃;

(4) thermal treatment: by the foundry goods air cooling of step (3) casting to room temperature, then from room temperature, be heated to 350-400 ℃, time is 2-3 hour, insulation 1-2 hour, be warming up to 600-650 ℃, the time is 2-3 hour again, insulation 30-50 minute, be warming up to 1000-1200 ℃, the time is 3-4 hour again; Insulation 3-3.5 hour, last oil cooling; Low-temperaturetempering: be heated to 300-350 ℃, be incubated air cooling after 4-5 hour.