CN102886620B - The boron alloyed high-toughness wear-resistant flux-cored wire of a kind of nitrogen - Google Patents
The boron alloyed high-toughness wear-resistant flux-cored wire of a kind of nitrogen Download PDFInfo
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- CN102886620B CN102886620B CN201210411083.4A CN201210411083A CN102886620B CN 102886620 B CN102886620 B CN 102886620B CN 201210411083 A CN201210411083 A CN 201210411083A CN 102886620 B CN102886620 B CN 102886620B
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Abstract
The present invention relates to a kind of high nitrogen, boron alloyed abrasion-proof overlaying welding flux-cored wire, its crust adopts mild-carbon steel strip, and core filler alloys or mineral dust, through being drawn into silk.The present invention is characterised in that and adds nitrogen, boron compound as NaN in medicine core pulvis
3with BN etc. and rare earth oxide, realize deposited metal height nitrogen, boron alloyed.This flux-cored wire chemical analysis (% by weight): carbon 1.0 ~ 3.0, chromium 35 ~ 40, niobium 1.0 ~ 2.0, boron 3.0 ~ 8.0, nitrogen 2.0 ~ 5.0, molybdenum 1.0 ~ 2.0, rare earth oxide 1.0 ~ 2.5, surplus is iron or other impurity.Due to the present invention's nitrogen, boron Substitute For Partial carbon alloy deposited metal, make surfacing hardness high, hardness reaches as high as HRC66 ~ 68, and good toughness, anti-wear performance is given prominence to, and is mainly used in consumable accessory Bead weld repair and the composite manufacturings such as Ferrous Metallurgy equipment, building machinery.
Description
Technical field
The invention belongs to solder wire material technical field, be specifically related to the boron alloyed abrasion-proof overlaying welding flux-cored wire of a kind of high nitrogen, be mainly used in consumable accessory Bead weld repair and the composite manufacturings such as Ferrous Metallurgy equipment, building machinery.
Background technology
Current hardfacing materials is main mainly with rich chromium cast iron, namely containing alloy elements such as carbon, chromium, silicon, manganese, with certain carbide, be facts have proved by a large amount of, rich chromium cast iron has very strong practicality as hardfacing powder core material, all higher than the hardness of general heap welding agent core material, wearability is better, and machining property is also greatly improved.Flux-cored wire, owing to significantly can improve the efficiency of Bead weld repair or composite manufacturing by hard surfacing, is saved time, and then creates more economic interests, and enjoys businessman to favor.
But traditional flux-cored wire hardness is low, wearability is bad, service life is short.Current hard-face alloy flux-cored wire material generally adopts carbon to carry out alloying, and high, the anti-weld crack poor performance of this material carbon equivalent, plasticity is low, easily peel off, high-temperature stability is lower, poor corrosion resistance.
Boron at China's rich reserves, FeB, Fe that boron and iron generate
2b, can improve surfacing hardness largely.Nitrogen and carbon have similarity, with nitrogen, boron Substitute For Partial carbon alloy deposited metal, can reduce the carbon equivalent of solder wire material, thus improve the cracking resistance, hardness, toughness, wearability etc. of overlay cladding.
Therefore, nitrogen, boron system surfacing welding alloy have good application prospect.
Summary of the invention
The present invention is characterised in that and adds NaN in abrasion-proof overlaying welding flux-cored wire
3, BN and rare earth oxide, realize deposited metal height nitrogen, boron alloyed, thus reach the object being developed into the novel wear resistant built-up welding self-protection flux-cored wire with high-wearing feature and toughness.
The boron alloyed abrasion-proof overlaying welding flux-cored wire material of the high nitrogen of one provided by the invention, its wearability mainly by with nitrogen, boron Substitute For Partial carbon alloy deposited metal, reduces the carbon equivalent of solder wire material, thus improves anti-weld crack performance; And FeB, Fe that boron and iron generate
2b, can improve surfacing hardness largely, and a small amount of boron can carbide grain in refining alloy, significantly improves the quenching degree of chrome cast iron, hardness and wearability; Sodium element can play the effect of stable arc.The present invention is by mild steel foreskin and medicine core powder constituent.
The technical scheme taked for achieving the above object is: the boron alloyed abrasion-proof overlaying welding flux-cored wire of a kind of high nitrogen, and its crust adopts H08A mild-carbon steel strip, and core filler alloys or mineral dust, medicine core powder is primarily of high carbon ferro-chrome, chromium powder, ferro-niobium, iron powder, NaN
3, BN, molybdenum-iron and rare earth oxide according to a certain percentage Homogeneous phase mixing form, in medicine core powder, the chemical component weight percentage of each component is: carbon 1.0 ~ 3.0, chromium 35 ~ 40, niobium 1.0 ~ 2.0, boron 3.0 ~ 8.0, nitrogen 2.0 ~ 5.0, molybdenum 1.0 ~ 2.0, rare earth 1.0 ~ 2.5, iron surplus.
The present invention is characterised in that and adds nitrogen, boron compound as NaN in medicine core pulvis
3, BN.
The rare earth oxide added in above-mentioned hardfacing medicine core powder is lanthana (La
2o
3), cerium oxide (general name of the oxide of cerium), praseodymium oxide (Pr
6o
11), or their mixture.
In medicine core, the effect of main component is as follows:
High carbon ferro-chrome, chromium powder: introduce carbon and chromium element, carbon content is higher, and the hardness of overlay cladding is higher; Cr is ferrite element, with the increase containing Cr amount, can limit the coarsening of austenite crystal, forms CrB and Cr simultaneously
2c
3, cause crystal boundary area coverage to increase, the anti-wear performance of overlay cladding also improves thereupon.
Ferro-niobium: introduce niobium element, can refinement deposited metal, and improve the hardness of deposited metal, the carbide of niobium as hard phase particle, can improve the hardness of overlay cladding; The wearing and tearing because micro-cutting and " plough " effect are formed can be reduced simultaneously after adding niobium, significantly improve the wearability of overlay cladding.
NaN
3, BN: introduce nitrogen, boron, sodium element, with nitrogen, boron Substitute For Partial carbon alloy deposited metal, improve surfacing hardness, wearability and toughness; The sodium element introduced can play the effect of stable arc.
Molybdenum-iron: introduce molybdenum element, molybdenum is stronger carbide former, when the content of molybdenum is more, will form double carbide and carbide [(Fe, Mo) in deposited metal
6c, MoC], the hardness of alloy is improved greatly; Meanwhile, molybdenum has strong inhibitory action to perlite phase transformation, is produced by the martensite impelled containing molybdenum, and this high alloy martensite phase hardness is very high, thus significantly improves the wearability of layer metal.
Rare earth oxide: rare earth oxide energy refinement overlay cladding carcass metal structure, eliminate the defect of carcass metal, refinement carcass metal fracture dimple, and the quantity tearing rib is increased, improve overlay cladding impact flexibility and plasticity, ceramic on metal is impelled to become polycrystalline transition region and local amorphous state thing phase with carcass metal interface, improve the bond strength at interface, adding the impact of carcass metal microstructure hardness of rare earth oxide is little, but the wearability that can significantly improve under overlay cladding dry friction and wear state, has certain antifriction function.
Hinge structure advantage of the present invention is as follows:
The present invention is by adding NaN
3, BN, introduce nitrogen, boron, sodium element.Nitrogen, boron and carbon have similarity, are interstitial solute atom, and can form Second Phase Particles with alloying elements such as Cr; Boron (B) can produce the effect assembled and play intercrystalline strengthening near crystal boundary, and appropriate boron can play the benefit increasing primary carbide quantity, a small amount of boron can carbide grain in refining alloy, significantly improves the quenching degree of chrome cast iron, hardness and wearability.Replace part carbon to carry out alloying with nitrogen, boron, the carbon equivalent of solder wire material can be reduced, thus improve anti-weld crack performance, hardness, toughness, the wearability of overlay cladding.Meanwhile, the sodium element of introducing can play the effect of stable arc.
Welding wire of the present invention realizes by the following method;
1. the method is by steel band by rolling, rolls into U-type groove, then toward wherein adding that configured in advance is good and through well-mixed medicine core powder (selected powder size is more than 70 orders), filling rate is 42%-55%.
2. through repeatedly rolling, U-type groove is rolled into O shape, and then with wire drawing machine drawing tube reducing to respective diameters size, last essence is coiled into dish.
Detailed description of the invention:
Embodiment 1
By high carbon ferro-chrome, chromium powder, ferro-niobium, iron powder, NaN
3, BN, molybdenum-iron and rare earth oxide according to a certain percentage Homogeneous phase mixing form, carbon, chromium, niobium, boron, nitrogen, molybdenum, iron and rare earth element shared percentage by weight in the chemical composition of medicine core is made in medicine core powder to be: carbon 1.0%, chromium 35%, niobium 1.0%, boron 3.0%, nitrogen 2.0%, molybdenum 1.0%, rare earth 1.0%, surplus is iron.Select the H08A cold-rolled strip of 12 × 0.2 (width is 12 ㎜, and thickness is 0.2 ㎜).First rolled into U-shaped.Get powder granularity for by 70 object sieves.Got powder is fully mixed 40 minutes in mixed powder machine, and then added by mixed-powder in U-shaped H08A cold-rolled steel trough of belt, filling rate is 42%, U-type groove is healed up, and medicinal powder is wrapped up wherein.And then with wire drawing machine by road drawing, tube reducing, finally making its diameter reach 2.8 ㎜, finally obtained surfacing layer metal hardness is 55-60HRC, and wearability is good.
Embodiment 2
By high carbon ferro-chrome, chromium powder, ferro-niobium, iron powder, NaN
3, BN, molybdenum-iron and rare earth oxide according to a certain percentage Homogeneous phase mixing form, carbon, chromium, niobium, boron, nitrogen, molybdenum, iron and rare earth element shared percentage by weight in the chemical composition of medicine core is made in medicine core powder to be: carbon 1.5%, chromium 36%, niobium 1.5%, boron 4.0%, nitrogen 3.0%, molybdenum 1.5%, rare earth 1.5%, surplus is iron.Select the H08A cold-rolled strip of 12 × 0.2 (width is 12 ㎜, and thickness is 0.2 ㎜).First rolled into U-shaped.Get powder granularity for by 70 object sieves.Got powder is fully mixed 40 minutes in mixed powder machine, and then added by mixed-powder in U-shaped H08A cold-rolled steel trough of belt, filling rate is 42%, U-type groove is healed up, and medicinal powder is wrapped up wherein.And then with wire drawing machine by road drawing, tube reducing, finally making its diameter reach 2.8 ㎜, finally obtained surfacing layer metal hardness is 58-62HRC, and wearability is good.
Embodiment 3
By high carbon ferro-chrome, chromium powder, ferro-niobium, iron powder, NaN
3, BN, molybdenum-iron and rare earth oxide according to a certain percentage Homogeneous phase mixing form, carbon, chromium, niobium, boron, nitrogen, molybdenum, iron and rare earth element shared percentage by weight in the chemical composition of medicine core is made in medicine core powder to be: carbon 1.5%, chromium 38%, niobium 2.0%, boron 6.0%, nitrogen 5.0%, molybdenum 1.5%, rare earth 2.0%, surplus is iron.Select the H08A cold-rolled strip of 14 × 0.3 (width is 14 ㎜, and thickness is 0.3 ㎜).First rolled into U-shaped.Get powder granularity for by 70 object sieves.Got various powder are mixed 40 minutes in mixed powder machine, and then added by mixed-powder in U-shaped H08A cold-rolled steel trough of belt, filling rate is 48%, U-type groove is healed up, and medicinal powder is wrapped up wherein.And then with wire drawing machine by road drawing, tube reducing, finally making its diameter reach 3.2 ㎜, finally obtained surfacing layer metal hardness is 60-64HRC, and wearability is good.
Embodiment 4
By high carbon ferro-chrome, chromium powder, ferro-niobium, iron powder, NaN
3, BN, molybdenum-iron and rare earth oxide according to a certain percentage Homogeneous phase mixing form, carbon, chromium, niobium, boron, nitrogen, molybdenum, iron and rare earth element shared percentage by weight in the chemical composition of medicine core is made in medicine core powder to be: carbon 2.0%, chromium 37%, niobium 2.0%, boron 5.0%, nitrogen 5.0%, molybdenum 2.0%, rare earth 2.0%, surplus is iron.Select the H08A cold-rolled strip of 14 × 0.3 (width is 14 ㎜, and thickness is 0.3 ㎜).First rolled into U-shaped.Get powder granularity for by 70 object sieves.Got powder is fully mixed 40 minutes in mixed powder machine, and then added by mixed-powder in U-shaped H08A cold-rolled steel trough of belt, filling rate is 48%, U-type groove is healed up, and medicinal powder is wrapped up wherein.And then with wire drawing machine by road drawing, tube reducing, finally making its diameter reach 3.2 ㎜, finally obtained surfacing layer metal hardness is 65-66HRC, and wearability is good.
Embodiment 5
By high carbon ferro-chrome, chromium powder, ferro-niobium, iron powder, NaN
3, BN, molybdenum-iron and rare earth oxide according to a certain percentage Homogeneous phase mixing form, carbon, chromium, niobium, boron, nitrogen, molybdenum, iron and rare earth element shared percentage by weight in the chemical composition of medicine core is made in medicine core powder to be: carbon 2.5%, chromium 38%, niobium 2.0%, boron 6.0%, nitrogen 5.0%, molybdenum 2.0%, rare earth 2.0%, surplus is iron.Select the H08A cold-rolled strip of 16 × 0.4 (width is 16 ㎜, and thickness is 0.4 ㎜).First rolled into U-shaped.Get powder granularity for by 70 object sieves.Got powder is fully mixed 40 minutes in mixed powder machine, and then added by mixed-powder in U-shaped H08A cold-rolled steel trough of belt, filling rate is 55%, U-type groove is healed up, and medicinal powder is wrapped up wherein.And then with wire drawing machine by road drawing, tube reducing, finally making its diameter reach 4.0 ㎜, finally obtained surfacing layer metal hardness is 64-68HRC, and wearability is good.
Embodiment 6
By high carbon ferro-chrome, chromium powder, ferro-niobium, iron powder, NaN
3, BN, molybdenum-iron and rare earth oxide according to a certain percentage Homogeneous phase mixing form, carbon, chromium, niobium, boron, nitrogen, molybdenum, iron and rare earth element shared percentage by weight in the chemical composition of medicine core is made in medicine core powder to be: carbon 2.5%, chromium 39%, niobium 2.0%, boron 7.0%, nitrogen 5.0%, molybdenum 2.0%, rare earth 2.5%, surplus is iron.Select the H08A cold-rolled strip of 16 × 0.4 (width is 16 ㎜, and thickness is 0.4 ㎜).First rolled into U-shaped.Get powder granularity for by 70 object sieves.Got various powder are mixed 40 minutes in mixed powder machine, and then added by mixed-powder in U-shaped H08A cold-rolled steel trough of belt, filling rate is 55%, U-type groove is healed up, and medicinal powder is wrapped up wherein.And then with wire drawing machine by road drawing, tube reducing, finally making its diameter reach 4.0 ㎜, finally obtained surfacing layer metal hardness is 66-68HRC, and wearability is good.
Embodiment 7
By high carbon ferro-chrome, chromium powder, ferro-niobium, iron powder, NaN
3, BN, molybdenum-iron and rare earth oxide according to a certain percentage Homogeneous phase mixing form, carbon, chromium, niobium, boron, nitrogen, molybdenum, iron and rare earth element shared percentage by weight in the chemical composition of medicine core is made in medicine core powder to be: carbon 3.0%, chromium 40%, niobium 2.0%, boron 8.0%, nitrogen 5.0%, molybdenum 2.0%, rare earth 2.5%, surplus is iron.Select the H08A cold-rolled strip of 16 × 0.4 (width is 16 ㎜, and thickness is 0.4 ㎜).First rolled into U-shaped.Get powder granularity for by 70 object sieves.Got powder is fully mixed 40 minutes in mixed powder machine, and then added by mixed-powder in U-shaped H08A cold-rolled steel trough of belt, filling rate is 55%, U-type groove is healed up, and medicinal powder is wrapped up wherein.And then with wire drawing machine by road drawing, tube reducing, finally making its diameter reach 4.0 ㎜, finally obtained surfacing layer metal hardness is 60-66HRC, and wearability is good.
Claims (1)
1. nitrogen, a boron alloyed high-toughness wear-resistant flux-cored wire, crust adopts mild-carbon steel strip, and core filler alloys or mineral dust, through being drawn into silk, is characterized in that adding nitrogen, boron compound in medicine core pulvis, and built-up welding realizes high nitrogen, boron alloyed;
Chemical part of described flux-cored wire is calculated as with % by weight: carbon 1.0 ~ 3.0, chromium 35 ~ 40, niobium 1.0 ~ 2.0, boron 3.0 ~ 8.0, nitrogen 2.0 ~ 5.0, molybdenum 1.0 ~ 2.0, rare earth 1.0 ~ 2.5, and surplus is iron.
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Effective date of registration: 20161205 Address after: 412000 Taishan West Road, Tianyuan District, Hunan, No. 88, No. Patentee after: Hunan University of Technology Address before: 412007 School of metallurgical engineering, Hunan University of Technology, 88 West Taishan Road, Tianyuan District, Hunan, Zhuzhou 405, China Patentee before: Yin Ruiming |