CN103614654A

CN103614654A - Alloy steel material used for engine shield and preparation method of the alloy steel material

Info

Publication number: CN103614654A
Application number: CN201310498032.4A
Authority: CN
Inventors: 黄浩
Original assignee: Wuhu Hongkun Auto Parts Co Ltd
Current assignee: Wuhu Hongkun Auto Parts Co Ltd
Priority date: 2013-10-22
Filing date: 2013-10-22
Publication date: 2014-03-05

Abstract

The invention discloses an alloy steel material used for an engine shield. The alloy steel material comprises following chemical elements by weight: 0.05-0.15% of carbon, 0.3-0.6% of manganese, 0.25-0.35% of silicon, 1.2-1.5% of tungsten, 0.003-0.005% of titanium, 0.1-0.15% cobalt, 2.3-2.5 of nickel, 4.4-4.7% of chromium, 0.3-0.5% of Mo, 0.05-0.08% of B, P not more than 0.030% and S not more than 0.030%, with the balance being iron. By utilization of combination of the tungsten, the nickel, the titanium and a plurality of other raw materials, and by reasonably arranging the ratio and the production technology and reasonably arranging the adding sequence,, the alloy material formed has characteristics of excellent comprehensive mechanical performances, especially good toughness, good plasticity, high strength and high hardness. A portion of waste iron is used as a raw material to make the alloy quality stable and uniform. The alloy is deep drawing resistant and corrosion resistant, and is suitable to be used as raw materials as the engine shield and a cab.

Description

A kind of alloy steel material for engine shield and preparation method thereof

Technical field

The present invention relates to metallic substance preparation field, relate in particular to a kind of alloy steel material for engine shield 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, in a lot of occasions, can't meet the requirement of production, 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 alloy steel material for engine shield and preparation method thereof, this alloy material have excellent plasticity-, can deep-draw, higher hardness, corrosion resistant characteristic.

Technical scheme of the present invention is as follows:

An alloy steel material for engine shield, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.05-0.15, manganese 0.3-0.6, silicon 0.25-0.35, tungsten 1.2-1.5, titanium 0.003-0.005, cobalt 0.1-0.15, nickel 2.3-2.5, chromium 4.4-4.7, Mo0.3-0.5, B0.05-0.08, P≤0.030, S≤0.030, surplus are iron.

The production method of the described alloy steel material for engine shield, 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, manganese, B; (2) tungsten, Mo, titanium; (3) chromium, nickel, cobalt; (4) other remaining component; The timed interval that each batch drops into element is 8-10 minute, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 180-200 ℃/h of speed, be warming up to 920-935 ℃, insulation 3-4 hour; With 130-150 ℃/h of speed, be cooled to 620-630 ℃ again, insulation 30-60 minute; With 100-120 ℃/h of speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 150-170 ℃/h of speed, be warming up to 520-540 ℃ again, insulation 2-3 hour, takes out air cooling and get final product.

Described refining agent is made by 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.

Beneficial effect of the present invention

The present invention is by using the plurality of raw materials such as tungsten, nickel, titanium to combine, proportioning and production technique are set through rationally, input order is rationally set, and the alloy material of formation has excellent comprehensive mechanical property, especially has the feature that good toughness, plasticity-are good, have higher-strength and hardness; And use part scrap iron as raw material, carry heavy alloyed steady quality homogeneous; The resistance to deep-draw of alloy of the present invention, corrosion-resistant, be suitable as the raw material of engine shield, wheel house.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

For an alloy steel material for engine shield, chemical element composition and mass percent thereof that it contains are: carbon 0.05-0.15, manganese 0.3-0.6, silicon 0.25-0.35, tungsten 1.2-1.5, titanium 0.003-0.005, cobalt 0.1-0.15, nickel 2.3-2.5, chromium 4.4-4.7, Mo0.3-0.5, B0.05-0.08, P≤0.030, S≤0.030, surplus are iron.

The production method of the described alloy steel material for engine shield:

(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, manganese, B; (2) tungsten, Mo, titanium; (3) chromium, nickel, cobalt; (4) other remaining component; The timed interval that each batch drops into element is 9 minutes, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 190 ℃/h of speed, be warming up to 930 ℃, be incubated 3.5 hours; With 140 ℃/h of speed, be cooled to 625 ℃ again, be incubated 50 minutes; With 110 ℃/h of speed, be cooled to 330 ℃ again, be incubated 2.5 hours; With 160 ℃/h of speed, be warming up to 530 ℃ again, be incubated 2.5 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.

The present invention for the mechanical property of the alloy steel material of engine shield is: tensile strength 1023MPa, yield strength 898MPa, unit elongation 14.5%, relative reduction in area 27%, impact absorbing energy 54J, impelling strength 63J/cm2, hardness 284HB.

Claims

1. for an alloy steel material for engine shield, it is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.05-0.15, manganese 0.3-0.6, silicon 0.25-0.35, tungsten 1.2-1.5, titanium 0.003-0.005, cobalt 0.1-0.15, nickel 2.3-2.5, chromium 4.4-4.7, Mo0.3-0.5, B0.05-0.08, P≤0.030, S≤0.030, surplus are iron.

2. the production method of the alloy steel material for engine shield according to claim 1, is characterized in that:

3. the production method of the alloy steel material for engine shield according to claim 2, is characterized in that: described casting postheat treatment is: first by room temperature, with 180-200 ℃/h of speed, be warming up to 920-935 ℃, insulation 3-4 hour; With 130-150 ℃/h of speed, be cooled to 620-630 ℃ again, insulation 30-60 minute; With 100-120 ℃/h of speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 150-170 ℃/h of speed, be warming up to 520-540 ℃ again, insulation 2-3 hour, takes out air cooling and get final product.

4. the production method of the alloy steel material for engine shield according to claim 2, is characterized in that: described refining agent is made by 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.