CN103757557A

CN103757557A - Wear-resistant high hardness alloy steel material and preparation method thereof

Info

Publication number: CN103757557A
Application number: CN201310696674.5A
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 wear-resistant high hardness alloy steel material, which contains the following chemical element components by mass percentage: 0.3-0.5 of carbon, 1.0-1.2 of silicon, 0.03-0.05 of boron, 3-4 of manganese, 1.3-1.5 of chromium, 0.3-0.5 of nickel, 0.1-0.2 of cobalt, 0.03-0.05 of molybdenum, 0.002-0.005 of Gd, 0.01-0.02 of Tb, 0.001-0.003 of Dy, 0.002-0.004 of Ho, 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 combining terbium, dysprosium and other rare earth elements as well as other raw materials, reasonably setting the proportion and the production process, and reasonably setting the putting sequence, the obtained alloy material has excellent comprehensive mechanical properties, especially has the characteristics of high strength and hardness, excellent wear resistance and the like, and also has certain toughness and plasticity.

Description

A kind of wear-resisting high hardness alloy steel and preparation method thereof

Technical field

The present invention relates to metallic substance preparation field, relate in particular to a kind of wear-resisting high hardness alloy steel 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 wear-resisting high hardness alloy steel and preparation method thereof, this alloy material has the feature of high wear resistance, hardness, toughness.

Technical scheme of the present invention is as follows:

A kind of wear-resisting high hardness alloy steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.3-0.5, silicon 1.0-1.2, boron 0.03-0.05, manganese 3-4, chromium 1.3-1.5, nickel 0.3-0.5, cobalt 0.1-0.2, molybdenum 0.03-0.05, Gd0.002-0.005, Tb0.01-0.02, Dy0.001-0.003, Ho0.002-0.004, P≤0.030, S≤0.030, surplus are iron.

The production method of described wear-resisting high hardness alloy steel, 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, chromium, nickel; (2) manganese, Gd, Tb; (3) boron, molybdenum, Dy; (4) other remaining component; The each batch of timed interval of dropping 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 920-935 ℃, insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 620-630 ℃ again, insulation 30-60 minute; With 100-120 ℃/h of speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 160-180 ℃/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, 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 rare earth element and other material combination such as terbium, dysprosium, proportioning and production technique are rationally set, input order is rationally set, the alloy material forming has excellent comprehensive mechanical property, especially have the feature that intensity and hardness are high, wear resistance is fabulous, have certain toughness and plasticity-simultaneously, use can the significant prolongation wear resisting part life-span, reduce mechanical damage, be applicable to the easy-abrasion parts such as axle; 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

A kind of wear-resisting high hardness alloy steel, chemical element composition and mass percent thereof that it contains are: carbon 0.3-0.5, silicon 1.0-1.2, boron 0.03-0.05, manganese 3-4, chromium 1.3-1.5, nickel 0.3-0.5, cobalt 0.1-0.2, molybdenum 0.03-0.05, Gd0.002-0.005, Tb0.01-0.02, Dy0.001-0.003, Ho0.002-0.004, P≤0.030, S≤0.030, surplus are iron.

The production method of described wear-resisting high hardness alloy steel is:

(2) in alloying process, to the lot sequence that drops into alloying element in stove, be: (1) silicon, chromium, nickel; (2) manganese, Gd, Tb; (3) boron, molybdenum, Dy; (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 220 ℃/h of speed, be warming up to 930 ℃, be incubated 3.5 hours; With 150 ℃/h of speed, be cooled to 620 ℃ again, be incubated 50 minutes; With 110 ℃/h of speed, be cooled to 330 ℃ again, be incubated 2.3 hours; With 170 ℃/h of speed, be warming up to 540 ℃ 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: 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 the wear-resisting high hardness alloy steel of the present invention is: tensile strength 1280MPa, yield strength 942MPa, unit elongation 13.9%, relative reduction in area 26.7%, impact absorbing energy 52.5J, impelling strength 62.2J/cm2, hardness 289.8HB.

Claims

1. a wear-resisting high hardness alloy steel, is characterized in that: chemical element composition and mass percent thereof that it contains are: carbon 0.3-0.5, silicon 1.0-1.2, boron 0.03-0.05, manganese 3-4, chromium 1.3-1.5, nickel 0.3-0.5, cobalt 0.1-0.2, molybdenum 0.03-0.05, Gd0.002-0.005, Tb0.01-0.02, Dy0.001-0.003, Ho0.002-0.004, P≤0.030, S≤0.030, surplus are iron.

2. the production method of wear-resisting high hardness alloy steel according to claim 1, is characterized in that:

3. the production method of wear-resisting high hardness alloy steel 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 920-935 ℃, insulation 3-4 hour; With 140-160 ℃/h of speed, be cooled to 620-630 ℃ again, insulation 30-60 minute; With 100-120 ℃/h of speed, be cooled to 320-340 ℃ again, insulation 2-3 hour; With 160-180 ℃/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 wear-resisting high hardness alloy steel 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.