CN103757552A

CN103757552A - Alloy steel material for cutting tools and preparation method thereof

Info

Publication number: CN103757552A
Application number: CN201310691722.1A
Authority: CN
Inventors: 程德峰
Original assignee: JIESHOU HUASHENG PLASTIC MACHINERY CO Ltd
Current assignee: JIESHOU HUASHENG PLASTIC MACHINERY CO Ltd
Priority date: 2013-12-17
Filing date: 2013-12-17
Publication date: 2014-04-30
Anticipated expiration: 2033-12-17
Also published as: CN103757552B

Abstract

The invention provides an alloy steel material for cutting tools. The alloy steel material comprises the following chemical elements by mass: 0.2 to 0.4% of C, 2.3 to 2.5% of Cr, 7.7 to 8.2% of Ni, 0.2 to 0.5% of Nb, 0.03 to 0.05% of Ti, 0.05 to 0.08% of Al, 0.004 to 0.007% of W, 0.02 to 0.05% of Mo, no more than 0.030% of P and no more than 0.030% of S, with the balance being Fe. According to the invention, through combination of a plurality of raw materials like Ni and reasonable setting of proportion, production process and a feeding sequence, the formed alloy material has high strength, high hardness, high toughness, high plasticity and corrosion resistance; a part of scrap iron is used as the raw material, so alloy quality is improved, stable and uniform; the alloy steel material is applicable to cutting tools; and through addition of a refining agent, the degree of porosity is reduced by 1 to 2 DEG.

Description

Alloy steel material and preparation method thereof for a kind of cutting tool

Technical field

The present invention relates to metallic substance preparation field, relate in particular to alloy steel material and preparation method thereof for a kind of cutting tool.

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 alloy steel material and preparation method thereof for a kind of cutting tool, this alloy material has high wear resistance, hardness, the advantage of plasticity and good toughness.

Technical scheme of the present invention is as follows:

A cutting tool alloy steel material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, Cr2.3-2.5, Ni7.7-8.2, Nb0.2-0.5, Ti0.03-0.05, Al0.05-0.08, tungsten 0.004-0.007, molybdenum 0.02-0.05, P≤0.030, S≤0.030, surplus are iron.

The production method of alloy steel material for described cutting tool, 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) Nb, Ti, Al; (2) Cr, Ni, tungsten; (3) other remaining component; The timed interval that each batch drops into element is 9-12 minute, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 230-250 ℃/h of speed, be warming up to 930-950 ℃, insulation 3-4 hour; With 140-160 ℃/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, by using the plurality of raw materials such as Ni to combine, rationally arranges proportioning and production technique, and input order is rationally set, and the alloy material of formation has high strength, high rigidity, has again high tenacity and plasticity-, also has corrosion resistant performance; And use part scrap iron as raw material, make the steady quality homogeneous of alloy; The present invention is applicable to cutting tool.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 cutting tool alloy steel material, chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, Cr2.3-2.5, Ni7.7-8.2, Nb0.2-0.5, Ti0.03-0.05, Al0.05-0.08, tungsten 0.004-0.007, molybdenum 0.02-0.05, P≤0.030, S≤0.030, surplus are iron.

The production method of alloy steel material for described cutting tool:

(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) Nb, Ti, Al; (2) Cr, Ni, tungsten; (3) other remaining component; The timed interval that each batch drops into element is 11 minutes, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 240 ℃/h of speed, be warming up to 940 ℃, be incubated 3.5 hours; With 150 ℃/h of speed, be cooled to 624 ℃ again, be incubated 40 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.

Cutting tool of the present invention by the mechanical property of alloy steel material is: tensile strength 1376MPa, yield strength 967MPa, unit elongation 15.2%, relative reduction in area 29%, impact absorbing energy 53J, impelling strength 64J/cm2, hardness 293HB.

Claims

1. a cutting tool alloy steel material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, Cr2.3-2.5, Ni7.7-8.2, Nb0.2-0.5, Ti0.03-0.05, Al0.05-0.08, tungsten 0.004-0.007, molybdenum 0.02-0.05, P≤0.030, S≤0.030, surplus are iron.

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

3. the production method of alloy steel material for cutting tool according to claim 2, is characterized in that: described casting postheat treatment is: first by room temperature, with 230-250 ℃/h of speed, be warming up to 930-950 ℃, insulation 3-4 hour; With 140-160 ℃/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 alloy steel material for cutting tool 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.