CN104073741A

CN104073741A - High-temperature and deformation resistant alloy steel material and preparation method thereof

Info

Publication number: CN104073741A
Application number: CN201410194580.2A
Authority: CN
Inventors: 肖颖
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 discloses a high-temperature and deformation resistant alloy steel material. The material comprises chemical elementary components in percentage by mass: 0.3-0.4 percent of carbon, 1.2-1.4 percent of silicon, 3.2-3.5 percent of chromium, 0.004-0.005 percent of tungsten, 0.03-0.05 percent of molybdenum, 0.003-0.005 percent of Ni, 2.3-2.5 percent of Mn, 0.004-0.005 percent of Cu, less than or equal to 0.030 percent of P, less than or equal to 0.030 percent of S, and the balance of Fe. According to the high-temperature and deformation resistant alloy steel material, the raw materials of molybdenum and tungsten are combined, the proportions and the production process are reasonably set, and the input order is reasonably set, so that the formed alloy material has the characteristics of high comprehensive mechanical property, high strength and hardness, high abrasive resistance and high flexibility; by adopting molybdenum and tungsten, the property of high temperature resistance is increased; a part of waste iron is used as the raw material so that the quality of the alloy is stable and uniform; by using refining agents, pore degrees of casting pieces are reduced by 1-2 degrees.

Description

Alloy steel material of a kind of high temperature resistant distortion and preparation method thereof

Technical field

The present invention relates to metallic substance preparation field, relate in particular to alloy steel material of a kind of high temperature resistant distortion 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 alloy steel material of a kind of high temperature resistant distortion and preparation method thereof, this alloy material has the feature of high hardness, toughness, high temperature resistant creep properties.

Technical scheme of the present invention is as follows:

An alloy steel material for high temperature resistant distortion, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.3-0.4, silicon 1.2-1.4, chromium 3.2-3.5, tungsten 0.004-0.005, molybdenum 0.03-0.05, Ni0.003-0.005, Mn2.3-2.5, Cu0.004-0.005, P≤0.030, S≤0.030, surplus are iron.

The production method of the alloy steel material of described high temperature resistant distortion, 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, Ni, chromium; (2) molybdenum, Cu; (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 200-230 ℃/h of speed, be warming up to 930-940 ℃, insulation 2.5-3 hour; With 130-150 ℃/h of speed, be cooled to 630-640 ℃ again, insulation 30-60 minute; With 100-120 ℃/h of speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 130-150 ℃/h of speed, be warming up to 530-540 ℃ 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 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 is by using molybdenum, tungsten material combination, proportioning and production technique are rationally set, input order is rationally set, the alloy material forming has good comprehensive mechanical property, not only there is higher intensity and hardness, feature that wear resistance is good, keep again good toughness, by using molybdenum and tungsten, increased resistant to elevated temperatures characteristic; 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

An alloy steel material for high temperature resistant distortion, chemical element composition and mass percent thereof that it contains are: carbon 0.3-0.4, silicon 1.2-1.4, chromium 3.2-3.5, tungsten 0.004-0.005, molybdenum 0.03-0.05, Ni0.003-0.005, Mn2.3-2.5, Cu0.004-0.005, P≤0.030, S≤0.030, surplus are iron.

The production method of the alloy steel material of described high temperature resistant distortion is:

(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, Ni, chromium; (2) molybdenum, Cu; (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 220 ℃/h of speed, be warming up to 936 ℃, be incubated 2.8 hours; With 140 ℃/h of speed, be cooled to 635 ℃ again, be incubated 45 minutes; With 110 ℃/h of speed, be cooled to 330 ℃ again, be incubated 2.5 hours; With 140 ℃/h of speed, be warming up to 535 ℃ again, be incubated 2.6 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 alloy steel material of the high temperature resistant distortion of the present invention is: tensile strength 976MPa, yield strength 856MPa, unit elongation 14%, relative reduction in area 24%, impact absorbing energy 53J, impelling strength 62J/cm2, hardness 287HB.

Claims

1. an alloy steel material for high temperature resistant distortion, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.3-0.4, silicon 1.2-1.4, chromium 3.2-3.5, tungsten 0.004-0.005, molybdenum 0.03-0.05, Ni0.003-0.005, Mn2.3-2.5, Cu0.004-0.005, P≤0.030, S≤0.030, surplus are iron.

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

3. the production method of the alloy steel material of high temperature resistant distortion 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 930-940 ℃, insulation 2.5-3 hour; With 130-150 ℃/h of speed, be cooled to 630-640 ℃ again, insulation 30-60 minute; With 100-120 ℃/h of speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 130-150 ℃/h of speed, be warming up to 530-540 ℃ again, insulation 2-3 hour, takes out air cooling and get final product.

4. the production method of the alloy steel material of high temperature resistant distortion 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.