CN103882340A

CN103882340A - Rare-earth alloy steel material and preparation method thereof

Info

Publication number: CN103882340A
Application number: CN201410059490.2A
Authority: CN
Inventors: 黄浩
Original assignee: Wuhu Hongkun Auto Parts Co Ltd
Current assignee: Wuhu Hongkun Auto Parts Co Ltd
Priority date: 2014-02-21
Filing date: 2014-02-21
Publication date: 2014-06-25

Abstract

The invention discloses a rare-earth alloy steel material, comprising the following chemical elements by mass percent: 0.1-0.3% of carbon, 0.1-0.2% of silicon, 2.2-2.5% of manganese, 11.0-11.5% of chromium, 3.0-3.3% of nickel, 0.3-0.5% of boron, 0.1-0.12% of lanthanum, 0.03-0.05% of yttrium, 0.003-0.005% of cerium, no more than 0.030% of P, no more than 0.030% of S, and the balance being iron. The rare-earth alloy steel material is combined by rare earth elements and other raw materials, the proportion and production technology are reasonably set, and the feeding order is reasonably set, so that the formed alloy material has good comprehensive mechanic performance, not only has the characteristics of high strength and hardness, good tenacity and plasticity. The wear-resisting property of alloy and the cold workability are greatly increased by adding rare-earth metals such as lanthanum, yttrium, cerium and the like. A refining agent is applied to casting production, the yield is obviously improved, and especially, the porosity of casting is reduced by 1-2 degrees.

Description

A kind of rare earth alloy steel and preparation method thereof

Technical field

The present invention relates to metallic substance preparation field, relate in particular to a kind of rare earth alloy steel and preparation method thereof.

Background technology

The development of steel alloy has had the history of more than 100 year, up to the present, diversified steel alloy is employed industrial, mainly contain with Types Below: quenched and tempered steel, spring steel, tool steel, rapid steel, die steel, high, normal, basic carbon alloy steel etc., so far, although steel alloy technology is greatly developed, but, still have a lot of problems to exist, as fastness to rubbing, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness, costs etc. can not be taken into account, can't meet the requirement of production in a lot of occasions, also require further improvement, to enhance productivity, reduce costs, improve security, for high-quality precision and sophisticated technology development provides safeguard, for social development provides power, task is also very arduous.

Summary of the invention

The object of the present invention is to provide a kind of rare earth alloy steel and preparation method thereof, this alloy material has very high wear resistance, high temperature resistant, good toughness, the feature that plasticity-is strong.

Technical scheme of the present invention is as follows:

A kind of rare earth alloy steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.1-0.3, silicon 0.1-0.2, manganese 2.2-2.5, chromium 11.0-11.5, nickel 3.0-3.3, boron 0.3-0.5, lanthanum 0.1-0.12, yttrium 0.03-0.05, cerium 0.003-0.005, P≤0.030, S≤0.030, surplus are iron.

The production method of described rare earth alloy steel, is characterized in that:

(1), the pig iron and scrap iron are dropped in stove and melt and originate as ferrous substrate in 1:2 ratio; Carry out desulfurization, deoxidation, alloying, the refining of employing refining agent, casting, casting postheat treatment etc.;

(2) in alloying process, to the lot sequence that drops into alloying element in stove be: (1) silicon, boron, lanthanum; (2) manganese, yttrium; (3) other remaining component; The each batch of timed interval of dropping into element is 9-12 minute, after feeding intake, stirs.

Described casting postheat treatment is: be first warming up to 930-945 ℃ by room temperature with 200-230 ℃/h of speed, insulation 3-4 hour; Be cooled to 630-650 ℃ with 140-160 ℃/h of speed again, insulation 30-60 minute; Be cooled to 320-340 ℃ with 100-120 ℃/h of speed again, insulation 2-3 hour; Be warming up to 520-540 ℃ with 150-170 ℃/h of speed again, insulation 2-3 hour, takes out air cooling and get final product.

Described refining agent is made up of the raw material of following weight part: instrument comminuted steel shot 3-4, clay 9-12, magnesium oxide 3-4, zinc chloride 2-3, sodium fluoroaluminate 5-6, aluminum oxide 1-2, bauxitic clay 5-6, vanadium boride 1-2, dimethyl tin oxide 1-2, aluminium hydroxide 8-10, jade powder 3-4, montmorillonite 1-2; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain final product.

Beneficial effect of the present invention

The present invention is by using rare earth element and other material combination, proportioning and production technique are rationally set, input order is rationally set, the alloy material of formation has good comprehensive mechanical property, not only there is the feature that intensity and hardness are high, and toughness, plasticity-are good; By adding the rare earth metals such as lanthanum, yttrium, cerium, greatly increase the wear resisting property of alloy, cold-forming property; And use part scrap iron as raw material, carry heavy alloyed steady quality homogeneous; Refining agent of the present invention is for Foundry Production, and the degree of porosity obviously improving in yield rate, particularly foundry goods reduces 1-2 degree, is controlled effectively, and can not produce pore at cast(ing) surface, and trapped oxide also obviously reduces, and oxide inclusion is 2 grades of left and right.

Embodiment

A kind of rare earth alloy steel, chemical element composition and mass percent thereof that it contains are: carbon 0.1-0.3, silicon 0.1-0.2, manganese 2.2-2.5, chromium 11.0-11.5, nickel 3.0-3.3, boron 0.3-0.5, lanthanum 0.1-0.12, yttrium 0.03-0.05, cerium 0.003-0.005, P≤0.030, S≤0.030, surplus are iron.

The production method of described rare earth alloy steel:

(2) in alloying process, to the lot sequence that drops into alloying element in stove be: (1) silicon, boron, lanthanum; (2) manganese, yttrium; (3) other remaining component; The each batch of timed interval of dropping into element is 10 minutes, after feeding intake, stirs.

Described casting postheat treatment is: be first warming up to 940 ℃ by room temperature with 220 ℃/h of speed, be incubated 3.5 hours; Be cooled to 640 ℃ with 150 ℃/h of speed again, be incubated 50 minutes; Be cooled to 330 ℃ with 110 ℃/h of speed again, be incubated 2.5 hours; Be warming up to 530 ℃ with 160 ℃/h of speed again, be incubated 2 hours, take out air cooling and get final product.

Described refining agent by following weight part (kilogram) raw material make: instrument comminuted steel shot 3, clay 9, magnesium oxide 3, zinc chloride 2, sodium fluoroaluminate 6, aluminum oxide 1, bauxitic clay 5, vanadium boride 1, dimethyl tin oxide 1, aluminium hydroxide 8, jade powder 4, montmorillonite 1; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain final product.

The mechanical property of rare earth alloy steel of the present invention is: tensile strength 1370MPa, yield strength 943MPa, unit elongation 15%, relative reduction in area 32%, impact absorbing energy 53J, impelling strength 63J/cm2, hardness 295HB.

Claims

1. a rare earth alloy steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.1-0.3, silicon 0.1-0.2, manganese 2.2-2.5, chromium 11.0-11.5, nickel 3.0-3.3, boron 0.3-0.5, lanthanum 0.1-0.12, yttrium 0.03-0.05, cerium 0.003-0.005, P≤0.030, S≤0.030, surplus are iron.

2. the production method of rare earth alloy steel according to claim 1, is characterized in that:

3. the production method of rare earth alloy steel according to claim 2, is characterized in that: described casting postheat treatment is: be first warming up to 930-945 ℃ by room temperature with 200-230 ℃/h of speed, insulation 3-4 hour; Be cooled to 630-650 ℃ with 140-160 ℃/h of speed again, insulation 30-60 minute; Be cooled to 320-340 ℃ with 100-120 ℃/h of speed again, insulation 2-3 hour; Be warming up to 520-540 ℃ with 150-170 ℃/h of speed again, insulation 2-3 hour, takes out air cooling and get final product.

4. the production method of rare earth alloy steel according to claim 2, is characterized in that: described refining agent is made up of the raw material of following weight part: instrument comminuted steel shot 3-4, clay 9-12, magnesium oxide 3-4, zinc chloride 2-3, sodium fluoroaluminate 5-6, aluminum oxide 1-2, bauxitic clay 5-6, vanadium boride 1-2, dimethyl tin oxide 1-2, aluminium hydroxide 8-10, jade powder 3-4, montmorillonite 1-2; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 100-200 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 2-3%, the nano-carbon powder of 1-2%, after mixing, under 8-15Mpa, be pressed into base, then, at 900-950 ℃, calcine 3-4 hour, cooling after, be ground into again 150-250 order powder, obtain final product.