CN104073740A

CN104073740A - Alloy steel material and preparation method thereof

Info

Publication number: CN104073740A
Application number: CN201410194487.1A
Authority: CN
Inventors: 张蔓青
Original assignee: Tongling Mingcheng Casting Co Ltd
Current assignee: Tongling Mingcheng Casting Co Ltd
Priority date: 2014-05-09
Filing date: 2014-05-09
Publication date: 2014-10-01

Abstract

The invention provides an alloy steel material. The alloy steel material comprises the following chemical elements by mass percent: 0.2-0.4% of carbon, 2.0-2.2% of manganese, 2.3-2.5% of chromium, 0.6-0.8% of silicon, 0.002-0.005% of cobalt, 0.005-0.007% of aluminium, 2.6-2.8% of nickel, 0.03-0.05% of Ti, 0.002-0.005% of Zr, 0.001-0.003% of Hf, not more than 0.030% of P, not more than 0.030% of S and the balance of iron. The alloy steel material has the beneficial effects that by combining the raw materials such as titanium, chromium and aluminium and reasonably setting the ratio, the production process and the putting order, the formed alloy material has better comprehensive mechanical properties, has the characteristics of high strength, high hardness, wear resistance, toughness, plasticity and the like, is low in cost and is suitable for machining various parts; part of scrap iron is used as the raw material, so that the quality of the alloy is improved and is stable and homogenous; the porosity is reduced by 1-2 degrees by adding a refining agent.

Description

A kind of alloy steel material 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 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 and preparation method thereof, this alloy material has the feature of high wear resistance, hardness, toughness and plasticity.

Technical scheme of the present invention is as follows:

An alloy steel material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, manganese 2.0-2.2, chromium 2.3-2.5, silicon 0.6-0.8, cobalt 0.002-0.005, aluminium 0.005-0.007, nickel 2.6-2.8, Ti0.03-0.05, Zr0.002-0.005, Hf0.001-0.003, P≤0.030, S≤0.030, surplus are iron.

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

(1), the pig iron and scrap iron are dropped in stove and melt and originate as ferrous substrate in 2:1 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, chromium, nickel; (2) manganese, aluminium, Ti; (3) other remaining component; The timed interval that each batch drops into element is 10-13 minute, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 200-230 ℃/h of speed, be warming up to 925-940 ℃, insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 630-645 ℃ again, insulation 40-60 minute; With 105-120 ℃/h of speed, be cooled to 315-330 ℃ 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, attapulgite 100-120, unslaked lime 2-3, nanometer jade powder 3-4, montmorillonite powder 1-2, perlite 95-110, BaCO3 3-4, Sodium Silicofluoride 4-5, Calcium Fluoride (Fluorspan) 2-3; Preparation method mixes each raw material, is heated to molten state and stirs remove slag, and 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 material combination such as titanium, chromium, aluminium, proportioning and production technique are rationally set, input order is rationally set, the alloy material forming has good comprehensive mechanical property, there is the features such as high intensity, hardness are high, wear resistance, toughness, plasticity-, cost is low, is applicable to the processing of multiple component; 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

An alloy steel material, chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, manganese 2.0-2.2, chromium 2.3-2.5, silicon 0.6-0.8, cobalt 0.002-0.005, aluminium 0.005-0.007, nickel 2.6-2.8, Ti0.03-0.05, Zr0.002-0.005, Hf0.001-0.003, P≤0.030, S≤0.030, surplus are iron.

(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, chromium, nickel; (2) manganese, aluminium, Ti; (3) other remaining component; The timed interval that each batch drops into element is 12 minutes, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 210 ℃/h of speed, be warming up to 930 ℃, be incubated 3.4 hours; With 150 ℃/h of speed, be cooled to 640 ℃ again, be incubated 50 minutes; With 110 ℃/h of speed, be cooled to 320 ℃ 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: described refining agent by following weight part (kilogram) raw material make: instrument comminuted steel shot 3, attapulgite 100-, unslaked lime 2, nanometer jade powder 3, montmorillonite powder 2, perlite 95, BaCO3 4, Sodium Silicofluoride 4, Calcium Fluoride (Fluorspan) 3; Preparation method mixes each raw material, is heated to molten state and stirs remove slag, and 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 mechanical property of alloy steel material of the present invention is: tensile strength 1189MPa, yield strength 865MPa, unit elongation 14.3%, relative reduction in area 29.9%, impact absorbing energy 53.6J, impelling strength 61.1J/cm2, hardness 285HB.

Claims

1. an alloy steel material, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.2-0.4, manganese 2.0-2.2, chromium 2.3-2.5, silicon 0.6-0.8, cobalt 0.002-0.005, aluminium 0.005-0.007, nickel 2.6-2.8, Ti0.03-0.05, Zr0.002-0.005, Hf0.001-0.003, P≤0.030, S≤0.030, surplus are iron.

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

3. the production method of alloy steel material according to claim 2, is characterized in that: described casting postheat treatment is: first by room temperature, with 200-230 ℃/h of speed, be warming up to 925-940 ℃, insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 630-645 ℃ again, insulation 40-60 minute; With 105-120 ℃/h of speed, be cooled to 315-330 ℃ 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 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, attapulgite 100-120, unslaked lime 2-3, nanometer jade powder 3-4, montmorillonite powder 1-2, perlite 95-110, BaCO3 3-4, Sodium Silicofluoride 4-5, Calcium Fluoride (Fluorspan) 2-3; Preparation method mixes each raw material, is heated to molten state and stirs remove slag, and 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.