CN103667987A

CN103667987A - Alloy steel material for building pump truck and preparation method thereof

Info

Publication number: CN103667987A
Application number: CN201310550360.4A
Authority: CN
Inventors: 张超
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-11-08
Filing date: 2013-11-08
Publication date: 2014-03-26

Abstract

The invention relates to an alloy steel material for a building pump truck, which contains the following chemical element components in percentage by mass: 0.3-0.5% of carbon, 0.03-0.08% of silicon, 2.3-2.5% of manganese, 0.03-0.05% of sulfur, 0.03-0.05% of phosphorus, 4.1-4.3% of nickel, 3.3-3.5% of chromium, 1.25-1.45% of molybdenum, 0.3-0.5% of tungsten, 2.4-2.6% of Ti, 1.2-1.3% of V, 0.03-0.04% of B and the balance of iron. According to the invention, the alloy steel formed through combination of multiple raw materials such as nickel, chromium, molybdenum, tungsten and the like by reasonably setting an adding order and reasonably controlling post-casting heat treatment temperature has the characteristics of high strength, high hardness, favorable wear resistance and good toughness. According to the invention, a refining agent is used for casting production, the porosity in castings is reduced by 1-2 levels, and the oxide inclusion is approximately at Level 2. The alloy steel provided by the invention is used for building pump trucks, and is resistant to corrosion, resistant to wear and long in service life.

Description

A kind of for building alloy steel material of pump truck and preparation method thereof

Technical field

The present invention relates to metallic substance preparation field, relate in particular to a kind of for building alloy steel material of pump truck 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 contains with Types Below: the steel alloy of the various excellent performances such as quenched and tempered steel, spring steel, roller bearing steel, tool steel, property steel, high temperature steel, low-temperature steel.

The steel alloy that pump valve is used has varied, technology has very much progress, but still has a lot of problems to exist, as wear resistance, hardness, rustless property, corrosion resistance nature, high and low temperature resistance, fragility, toughness etc., 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 ofly for building alloy steel material of pump truck and preparation method thereof, this alloy material has the feature of high wear resistance, corrosion-resistant, high strength, good toughness.

Technical scheme of the present invention is as follows:

For building an alloy steel material for pump truck, it is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.3-0.5, silicon 0.03-0.08, manganese 2.3-2.5, sulphur 0.03-0.05, phosphorus 0.03-0.05, nickel 4.1-4.3, chromium 3.3-3.5, molybdenum 1.25-1.45, tungsten 0.3-0.5, Ti 2.4-2.6, V1.2-1.3, B 0.03-0.04, surplus are iron.

Described for building the production method of the alloy steel material of pump truck, it is characterized in that:

(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:1-3 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, 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) chromium, nickel, tungsten; (3) other remaining component; The timed interval that each batch drops into element is 13-16 minute, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 220-235 ℃/h of speed, be warming up to 620-635 ℃, then be cooled to 550-570 ℃ with 160-170 ℃/h of speed, then continue to be warming up to 925-940 ℃ with 220-235 ℃/h of speed, insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 650-670 ℃ again, then be warming up to 730-740 ℃ with 160-180 ℃/h of speed, insulation 40-60 minute, then with 140-160 ℃/h of speed, be cooled to 570-590 ℃, insulation 50-70 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 350-370 ℃ again, then be cooled to 200-230 ℃ with 50-60 ℃/h of speed, then be warming up to 530-550 ℃ with 150-170 ℃/h of speed, 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 rhombspar 3-5, sodium sulfate 3-5, aluminum chloride 5-8, salt of wormwood 3-5, attapulgite 8-10, NaBF ₄5-8, sodium-chlor 3-5, Na ₂tiF ₆8-10, NaF 5-8, lime 2-3, quartz sand 4-5, 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 nickel, chromium, molybdenum, tungsten to combine, through input order is rationally set, rationally controls casting postheat treatment temperature, and the steel alloy of formation has that high strength, high rigidity, wear resistance are good, the feature of good toughness; Use part scrap iron as raw material, and through secondary refining, make more stable uniform of quality.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, can not produce pore at cast(ing) surface, and trapped oxide also obviously reduces, 2 grades of left and right.Steel alloy of the present invention is used for building pump truck, corrosion-resistant, wear-resisting, long service life.

Embodiment

For building an alloy steel material for pump truck, chemical element composition and mass percent thereof that it contains are: carbon 0.3-0.5, silicon 0.03-0.08, manganese 2.3-2.5, sulphur 0.03-0.05, phosphorus 0.03-0.05, nickel 4.1-4.3, chromium 3.3-3.5, molybdenum 1.25-1.45, tungsten 0.3-0.5, Ti 2.4-2.6, V1.2-1.3, B 0.03-0.04, surplus are iron.

Described for building the production method of the alloy steel material of pump truck is:

(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:2 ratio, the pig iron is added to drop in stove and melt, carry out desulfurization, deoxidation, employing refining agent initial refining, add alloying constituent and carry out alloying, then add scrap iron fusing, add refining agent secondary refining, detection and adjust chemical element component content to qualified, 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) chromium, nickel, tungsten; (3) other remaining component; The timed interval that each batch drops into element is 14 minutes, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 230 ℃/h of speed, be warming up to 630 ℃, then be cooled to 560 ℃ with 165 ℃/h of speed, then continue to be warming up to 930 ℃ with 230 ℃/h of speed, be incubated 3.5 hours; With 150 ℃/h of speed, be cooled to 660 ℃ again, then be warming up to 735 ℃ with 170 ℃/h of speed, be incubated 50 minutes, then be cooled to 580 ℃ with 150 ℃/h of speed, 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 360 ℃ again, then be cooled to 220 ℃ with 55 ℃/h of speed, then be warming up to 540 ℃ with 160 ℃/h of speed, 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 3.5 rhombspars 4, sodium sulfate 4, aluminum chloride 6, salt of wormwood 4, attapulgite 9, NaBF ₄7, sodium-chlor 4, Na ₂tiF ₆9, NaF 7, lime 2.5, quartz sand 4.6, jade powder 3.5, montmorillonite 1.5; Preparation method mixes each raw material, is heated to molten state, then, is poured into Quench in pure water, then is ground into 150 order powder; Gained powder is added and is equivalent to the silane resin acceptor kh-550 of powder weight 3%, 2% nano-carbon powder, after mixing, under 12Mpa, be pressed into base, then, at 930 ℃, calcine 3.4 hours, cooling after, then be ground into 190 order powder, obtain.

The present invention for building the mechanical property of the alloy steel material of pump truck is: tensile strength 1267MPa, yield strength 934MPa, unit elongation 14.7%, relative reduction in area 34%, impact absorbing energy 54J, impelling strength 63.5J/cm2, hardness 291HB.

Claims

1. for building an alloy steel material for pump truck, it is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.3-0.5, silicon 0.03-0.08, manganese 2.3-2.5, sulphur 0.03-0.05, phosphorus 0.03-0.05, nickel 4.1-4.3, chromium 3.3-3.5, molybdenum 1.25-1.45, tungsten 0.3-0.5, Ti 2.4-2.6, V1.2-1.3, B 0.03-0.04, surplus are iron.

2. according to claim 1 for building the production method of the alloy steel material of pump truck, it is characterized in that:

3. according to claim 2 for building the production method of the alloy steel material of pump truck, it is characterized in that: described casting postheat treatment is: first by room temperature, with 220-235 ℃/h of speed, be warming up to 620-635 ℃, with 160-170 ℃/h of speed, be cooled to 550-570 ℃ again, continue to be again warming up to 925-940 ℃ with 220-235 ℃/h of speed insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 650-670 ℃ again, then be warming up to 730-740 ℃ with 160-180 ℃/h of speed, insulation 40-60 minute, then with 140-160 ℃/h of speed, be cooled to 570-590 ℃, insulation 50-70 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 350-370 ℃ again, then be cooled to 200-230 ℃ with 50-60 ℃/h of speed, then be warming up to 530-550 ℃ with 150-170 ℃/h of speed, insulation 2-3 hour, takes out air cooling and get final product.

4. according to claim 2 for building the production method of the alloy steel material of pump truck, it is characterized in that: described refining agent is made by the raw material of following weight part: instrument comminuted steel shot 3-4 rhombspar 3-5, sodium sulfate 3-5, aluminum chloride 5-8, salt of wormwood 3-5, attapulgite 8-10, NaBF ₄5-8, sodium-chlor 3-5, Na ₂tiF ₆8-10, NaF 5-8, lime 2-3, quartz sand 4-5, 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.