CN103667996A

CN103667996A - Wear-resistant low-carbon steel material for pumps and preparation method thereof

Info

Publication number: CN103667996A
Application number: CN201310550267.3A
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 a wear-resistant low-carbon steel material for pumps, which contains the following chemical components in percentage by mass: 2.6-2.8% of carbon, 2.1-2.3% of silicon, 5.2-5.4% of manganese, 0.3-0.5% of nickel, 1.6-1.8% of chromium, 0.2-0.4% of zinc, 0.12-0.15% of Be, 0.06-0.08% of Pb, 0.1-0.15% of La, at most 0.030% of P, at most 0.030% of S and the balance of iron. By using the combination of the manganese, molybdenum, boron and many other raw materials, the raw material proportion and the feed sequence are reasonably arranged, so that the formed alloy steel has the characteristics of favorable wear resistance, favorable toughness and high strength. Part of scrap iron is used as the raw material, and secondary refining is performed, so that the product quality is more stable and uniform. When the refining agent is used for casting production, the porosity is lowered by 1-2 degrees, and the oxide inclusions are lowered by 2 levels or so. The alloy steel is used for pump valves, pump bodies and other parts, and has the advantages of favorable corrosion resistance, favorable wear resistance and favorable toughness.

Description

Wear-resisting low-carbon steel and preparation method thereof for a kind of pump

Technical field

The present invention relates to metallic substance preparation field, relate in particular to wear-resisting low-carbon steel and preparation method thereof for a kind of pump.

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 wear-resisting low-carbon steel and preparation method thereof for a kind of pump, 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:

A pump wear-resisting low-carbon steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: C0.1-0.15, Mn3.1-3.4, Si0.1-0.12, Cr2.1-2.5, Mo2.1-2.2, Ni0.1-0.12, B0.13-0.16, Sb0.25-0.37, Bi0.09-0.12, Yb0.1-0.12, P≤0.030, S≤0.030, surplus are iron.

The production method of wear-resisting low-carbon steel for described pump, is characterized in that:

(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:2-3 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) Si, Cr, Ni; (2) Mn, Mo, Yb; (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 180-200 ℃/h of speed, be warming up to 670-690 ℃, then be cooled to 540-560 ℃ with 140-160 ℃/h of speed, then continue to be warming up to 915-930 ℃ with 180-200 ℃/h of speed, insulation 3-4 hour; With 160-180 ℃/h of speed, be cooled to 630-650 ℃ again, then be warming up to 720-740 ℃ with 160-180 ℃/h of speed, then be cooled to 570-590 ℃ with 140-160 ℃/h of speed, 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, insulation 60-80 minute, 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 manganese, molybdenum, boron to combine, rationally arranges proportioning raw materials, and input order is rationally set, and rationally controls casting postheat treatment temperature, and the steel alloy of formation has that wear resistance is good, good toughness, high-intensity feature; 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, 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.Steel alloy of the present invention is for the parts such as the valve of pump, the pump housing, corrosion-resistant, wear-resisting, good toughness.

Embodiment

A pump wear-resisting low-carbon steel, chemical element composition and mass percent thereof that it contains are: C0.1-0.15, Mn3.1-3.4, Si0.1-0.12, Cr2.1-2.5, Mo2.1-2.2, Ni0.1-0.12, B0.13-0.16, Sb0.25-0.37, Bi0.09-0.12, Yb0.1-0.12, P≤0.030, S≤0.030, surplus are iron.

Described pump by the production method of wear-resisting low-carbon steel is:

(1), preparing the pig iron and scrap iron originates as ferrous substrate in 1:2.5 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) Si, Cr, Ni; (2) Mn, Mo, Yb; (3) other remaining component; The timed interval that each batch drops into element is 15 minutes, after feeding intake, stirs.

Described casting postheat treatment is: first by room temperature, with 190 ℃/h of speed, be warming up to 680 ℃, then be cooled to 550 ℃ with 150 ℃/h of speed, then continue to be warming up to 920 ℃ with 190 ℃/h of speed, be incubated 3.5 hours; With 170 ℃/h of speed, be cooled to 640 ℃ again, then be warming up to 730 ℃ with 170 ℃/h of speed, 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, be incubated 70 minutes, then be warming up to 540 ℃ with 160 ℃/h of speed, 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 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.

Pump of the present invention by the mechanical property of wear-resisting low-carbon steel is: tensile strength 1298MPa, yield strength 954MPa, unit elongation 14.9%, relative reduction in area 31%, impact absorbing energy 54J, impelling strength 65J/cm2, hardness 279HB.

Claims

1. a pump wear-resisting low-carbon steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: C0.1-0.15, Mn3.1-3.4, Si0.1-0.12, Cr2.1-2.5, Mo2.1-2.2, Ni0.1-0.12, B0.13-0.16, Sb0.25-0.37, Bi0.09-0.12, Yb0.1-0.12, P≤0.030, S≤0.030, surplus are iron.

2. the production method of wear-resisting low-carbon steel for pump according to claim 1, is characterized in that:

3. the production method of wear-resisting low-carbon steel for pump according to claim 2, it is characterized in that: described casting postheat treatment is: first by room temperature, with 180-200 ℃/h of speed, be warming up to 670-690 ℃, with 140-160 ℃/h of speed, be cooled to 540-560 ℃ again, continue to be again warming up to 915-930 ℃ with 180-200 ℃/h of speed insulation 3-4 hour; With 160-180 ℃/h of speed, be cooled to 630-650 ℃ again, then be warming up to 720-740 ℃ with 160-180 ℃/h of speed, then be cooled to 570-590 ℃ with 140-160 ℃/h of speed, 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, insulation 60-80 minute, 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. the production method of wear-resisting low-carbon steel for pump 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 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.