CN103757537A

CN103757537A - High hardness and low cold brittleness alloy steel material and preparation method thereof

Info

Publication number: CN103757537A
Application number: CN201310696622.8A
Authority: CN
Inventors: 查坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-18
Filing date: 2013-12-18
Publication date: 2014-04-30

Abstract

The invention relates to a high hardness and low cold brittleness alloy steel material, which contains the following chemical elements by mass: 1.1-1.3 of carbon, 0.5-0.8 of silicon, 0.2-0.3 of manganese, 7.6-7.8 of titanium, 0.02-0.05 of aluminum, 1.0-2.5 of molybdenum, 0.006-0.009 of vanadium, 0.3-0.5 of Nb, less than or equal to 0.030 of P, less than or equal to 0.030 of S, and the balance iron. According to the invention, by using titanium and other raw material combination, reasonably setting the proportion and the production process, and reasonably setting the putting sequence, the formed alloy material has the characteristics of high strength, hardness, wear resistance and the like, and especially has low cold brittleness, thus being suitable for machinery operating in a low temperature environment. And part of scrap iron is used as the raw material to make the quality of the alloy stable and uniform. By adding the refining agent, the degree of porosity can be lowered by 1-2 degrees.

Description

Low cold shortness alloy steel material of a kind of high rigidity and preparation method thereof

Technical field

The present invention relates to metallic substance preparation field, relate in particular to low cold shortness alloy steel material of a kind of high rigidity 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 low cold shortness alloy steel material of a kind of high rigidity and preparation method thereof, this alloy material has the feature of high rigidity, low cold shortness.

Technical scheme of the present invention is as follows:

The low cold shortness alloy steel material of a kind of high rigidity, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 1.1-1.3, silicon 0.5-0.8, manganese 0.2-0.3, titanium 7.6-7.8, aluminium 0.02-0.05, molybdenum 1.0-2.5, vanadium 0.006-0.009, Nb0.3-0.5, P≤0.030, S≤0.030, surplus are iron.

The production method of the low cold shortness alloy steel material of described high rigidity, is characterized in that:

(1), the pig iron and scrap iron are dropped in stove and melt and originate as ferrous substrate in 1:1 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, aluminium, vanadium; (2) manganese, molybdenum, Nb; (3) chromium, nickel, cobalt; (4) other remaining component; The each batch of timed interval of dropping into element is 10-13 minute, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 230-250 ℃/h of speed, be warming up to 935-950 ℃, insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 640-660 ℃ again, insulation 50-80 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 530-550 ℃ 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 10-12, Wingdale 3-4, sepiolite 2-3, Sodium Silicofluoride 2-3, SODIUMNITRATE 1-2, vermiculite 5-6, silicon carbide 9-11, titanium dioxide 2-3, fluorite 6-8, aluminium hydroxide 8-10, jade powder 3-4, montmorillonite 1-2; 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, by using the material combination such as titanium, rationally arranges proportioning and production technique, and input order is rationally set, and the alloy material of formation has the features such as high intensity, hardness, wear resistance, especially has low cold shortness, is adapted at the machinery of low temperature environment operation; And use part scrap iron as raw material, make the steady quality homogeneous of alloy.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

The low cold shortness alloy steel material of a kind of high rigidity, chemical element composition and mass percent thereof that it contains are: carbon 1.1-1.3, silicon 0.5-0.8, manganese 0.2-0.3, titanium 7.6-7.8, aluminium 0.02-0.05, molybdenum 1.0-2.5, vanadium 0.006-0.009, Nb0.3-0.5, P≤0.030, S≤0.030, surplus are iron.

The production method of the low cold shortness alloy steel material of described high rigidity is:

(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, aluminium, vanadium; (2) manganese, molybdenum, Nb; (3) chromium, nickel, cobalt; (4) other remaining component; The each batch of timed interval of dropping 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 650 ℃ again, be incubated 60 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 540 ℃ 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 4, clay 10, Wingdale 3, sepiolite 2, Sodium Silicofluoride 2, SODIUMNITRATE 2, vermiculite 5, silicon carbide 9, titanium dioxide 2, fluorite 8, aluminium hydroxide 8, jade powder 3, montmorillonite 2; 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%, 1% nano-carbon powder, after mixing, under 12-15Mpa, 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 the low cold shortness alloy steel material of high rigidity of the present invention is: tensile strength 1356MPa, yield strength 953MPa, unit elongation 12.5%, relative reduction in area 24%, impact absorbing energy 49.7J, impelling strength 61.2J/cm2, hardness 293HB.

Claims

1. the low cold shortness alloy steel material of high rigidity, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 1.1-1.3, silicon 0.5-0.8, manganese 0.2-0.3, titanium 7.6-7.8, aluminium 0.02-0.05, molybdenum 1.0-2.5, vanadium 0.006-0.009, Nb0.3-0.5, P≤0.030, S≤0.030, surplus are iron.

2. the production method of the low cold shortness alloy steel material of high rigidity according to claim 1, is characterized in that:

3. the production method of the low cold shortness alloy steel material of high rigidity 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 935-950 ℃, insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 640-660 ℃ again, insulation 50-80 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 530-550 ℃ again, insulation 2-3 hour, takes out air cooling and get final product.

4. the production method of the low cold shortness alloy steel material of high rigidity 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 10-12, Wingdale 3-4, sepiolite 2-3, Sodium Silicofluoride 2-3, SODIUMNITRATE 1-2, vermiculite 5-6, silicon carbide 9-11, titanium dioxide 2-3, fluorite 6-8, aluminium hydroxide 8-10, jade powder 3-4, montmorillonite 1-2; 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.