CN1028656C - Wear-resistant low-alloy steel - Google Patents
Wear-resistant low-alloy steel Download PDFInfo
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- CN1028656C CN1028656C CN 93109961 CN93109961A CN1028656C CN 1028656 C CN1028656 C CN 1028656C CN 93109961 CN93109961 CN 93109961 CN 93109961 A CN93109961 A CN 93109961A CN 1028656 C CN1028656 C CN 1028656C
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Abstract
The present invention belongs to the field of alloy steel. The present invention is mainly suitable for wear resistant components of a knitting machine. The present invention is characterized in that the present invention comprises the chemical components: 1.25 to 1.55 wt% of C, 0.35 to 0.85 wt% of Mn, 1.40 to 1.90 wt% of Cr, 0.1 to 0.6 wt% of V, 0.1 to 0.3 wt% of Re, less than 0.35 wt% of Si and Fe as the rest. The final metallographic structure is composed of a matrix of hidden acicular tempered martensite, carbide and residual austenite. The steel has high hardness and favorable toughness; simultaneously, the casting performance is favorable, and the finished product rate of casting pieces is high.
Description
The invention belongs to field of alloy steel.Main as the knitting machine high-abrasive material.
Wear resistance and comprehensive economy that knitting machine is walked needle cam are one of item keys of evaluation knitting machine quality.Both at home and abroad, life-time service W18Cr4V steel, GCr15 steel, Cr12Mo steel etc. are walked the material of needle cam as knitting machine.Wherein, W18Cr4V and Cr12Mo steel contain valuable W, the Cr element reaches 12～22%, and need heat to quench, and energy consumption is big, and thermal treatment process is complicated; And the GCr15 steel is used as when taking the needle cam material, and wear resistance is relatively poor, lack work-ing life (" second, the 3rd of steel alloy steel grade handbook, metallurgical industry press, nineteen eighty-three).
Swiss Patent CH660884 provides a kind of wear-resistant low-alloy steel, is used to make the accessory on the weaving teaser.Because the carbon chromium content of this steel is on the low side, and hardness is relatively poor, will cause relatively poor wear resistance, so should not be used as the knitting machine cam material that takes the needle.
The object of the present invention is to provide a kind of wear-resistant low-alloy steel of wear resisting property excellence.
Resemble knitting machine and walk the component of needle cam and so on, the gouging abrasion and the adhesive wear that continue of its wear form little energy that to be another rigidity component (as draw point) cause it.Has good abrasion resistance in order to ensure this class cam, cam itself should have sufficiently high hardness and toughness, both must take into account, facts have proved that simple high rigidity can not reach the purpose that improves the cam wear resisting property, what need is hardness and flexible good combination, and material itself has suitable metallographic microstructure.Simultaneously, the requirement for material-saving, economic rationality such as energy-conservation should reduce the content of alloying element as far as possible, and avoid adopting high-temperature heat treatment, to cut down the consumption of energy.
For the foregoing reasons, the chemical ingredients of wear-resistant low-alloy steel of the present invention (weight %) is: C1.25～1.55%, and Mn0.35～0.85%, Cr1.40～1.90%, V0.1～0.6%, RE0.1～0.3%, Si＜0.35%, surplus is Fe.
In above-mentioned chemical ingredients, carbon is the most cheap strengthening element that is adopted in the common steel.Carbon mainly exists with the form of solid solution or generation carbide in steel.The solid solution capacity of carbon in α iron is limited, and too high carbon amount can not improve the hardness of steel effectively, can increase the fragility of steel on the contrary, and therefore, in the present invention, carbon is advisable with 1.25～1.55%.
Chromium and iron can form continuous solid solution, and can form multiple carbide with carbon (iron).Add a certain amount of chromium in the steel, can improve hardness and intensity, along with the increase of chromium content, the tensile strength of steel and hardness also significantly rise, and therefore, chromium is the normal chemical element that adopts in the wear resisting steel.But adding too much chromium, is irrational economically.So chromium content of the present invention is controlled at 1.40～1.90%.
Vanadium and carbon have extremely strong avidity, and it mainly exists with carbide morphology in steel.The main effect of vanadium in steel is thinning microstructure and crystal grain, improves the intensity and the toughness of steel; The carbide of vanadium has high hardness and wear resistance.In the present invention, its content is 0.1～0.6%.
The purpose that adds rare earth among the present invention: the one, improve the castability of steel, increase the flowability of steel stream, and improve the surface quality of steel ingot or foundry goods, improve casting yield; The 2nd, the plasticity and the toughness of raising steel, because rare earth has deoxidation, desulfurization, the degassing, reduce the effect of inclusion, therefore, can improve the plasticity and the toughness of steel, on the other hand, the sulfide of rare earth element, oxide compound and other compound are in the solidification of molten steel process, all be crystallization nuclei, thus effectively refinement the tissue of crystal grain and steel, this also helps improving the plasticity and the toughness of steel.Because except sufficiently high hardness, have good toughness, also be the essential condition that improves knitting machine cam wear resisting property, this just the present invention add one of main purpose of rare earth.
The present invention is after the molten refining of smelting furnace, and molten steel can be cast into steel ingot, forges or rolling becoming a useful person again; Molten steel also can directly be washed and cast foundry goods, and use is provided.Final heat treating regime: 820～880 ℃ of quenching temperatures, oil cooling, hardness reaches HRC63～66,140～200 ℃ of tempering temperatures, air cooling, hardness HRC are 62～65.Final metallographic structure is: latent acicular tempered martensite matrix+carbide+remaining Chou Shi body.
Compared with prior art, the present invention has following advantage:
(1) not only has higher hardness, but also have toughness preferably, so wear resisting property is good.
(2) final thermal treatment temp is low, can save energy.
(3) good casting property, the casting yield height.
Embodiment
According to chemical ingredients scope of the present invention, on common induction furnace, smelted 4 stoves steel of the present invention.In order to contrast, same equipment of while has also been smelted a stove and has not been contained Comparative Examples grade of steel rare earth, that other composition is consistent with the present invention; In addition, a stove W18Cr4V steel and a stove GCr15 steel have also been smelted respectively.Its concrete chemical ingredients is as shown in table 1.Behind the 7 stove smelting steels, a part of molten steel casting becomes ingot casting, and a part of molten steel direct pouring becomes strand, and steel ingot forges into base subsequently.Strand and forging stock are annealed, be reprocessed into sample, quench then and tempering heat treatment, its heat treating regime is as shown in table 2.To through thermal treatment and the casting that grinds, forge sample and carry out test of polishing scratch width and hardness test, test-results is as shown in table 3.In addition, also tested casting yield and casting crystalline grain degree, its result is as shown in table 4.
Polishing scratch width experimental test on ring-block abrasion tester.
The chemical ingredients of table 1 embodiment and Comparative Examples (Wt%)
Element
C Si Mn Cr V RE Fe remarks
Heat (batch) number
Foundry goods surplus in the of 1 1.26 0.29 0.55 1.41 0.26 0.12
Foundry goods surplus the basis 2 1.55 0.30 0.84 1.90 0.59 0.15
Send out
Foundry goods surplus in the of bright 3 1.40 0.32 0.65 1.71 0.45 0.09
Foundry goods surplus in the of 4 1.45 0.28 0.60 1.81 0.50 0.10
Comparative Examples 1.50 0.31 0.71 1.85 0.52/surplus foundry goods
The surplus forging of W18Cr4V 0.75 0.35 0.31 4.40 1.05 W18.50
GCr15 0.98 0.29 0.44 1.50/surplus forging
Table 2 embodiment and Comparative Examples heat treating regime
Thermal treatment
Anneal quench treatment temper
Heat (batch) number
1 840 ℃, cold 880 ℃ of stove, 140 ℃ of oil coolings, air cooling
These 2 850 ℃, cold 820 ℃ of stove, 190 ℃ of oil coolings, air cooling
Send out
Bright 3 830 ℃, cold 840 ℃ of stove, 160 ℃ of oil coolings, air cooling
4 840 ℃, cold 850 ℃ of stove, 150 ℃ of oil coolings, air cooling
840 ℃ of Comparative Examples, cold 850 ℃ of stove, 160 ℃ of oil coolings, air cooling
880 ℃ of W18Cr4V, cold 1280 ℃ of stove, 560 ℃ of oil coolings, 3 tempering
800 ℃ of GCr15,840 ℃ of air coolings, 170 ℃ of oil coolings, air cooling
Table 3 embodiment and Comparative Examples performance
Project
Polishing scratch width (mm) hardness (HRC)
Heat (batch) number
1 4.80 63
These are 2 4.35 64 years old
Send out
Bright 3 5.00 63.5
4 4.25 65
Comparative Examples 5.34 63
W18Cr4V 5.07 66
GCr15 6.05 63
Table 4 embodiment and Comparative Examples castability and grain fineness number
Project
The qualified casting grain fineness number
Heat (batch) number (%) (level)
1 90 10
These are 2 95 11～10 years old
Send out
Bright 3 93 10
4 / 11～10
Comparative Examples 85 9
Claims (2)
1, a kind of wear-resistant low-alloy steel is characterized in that chemical ingredients (weight %) is: C1.25～1.55%, and Mn0.35～0.85%, Cr1.40～1.90%, V0.1～0.6%, RE0.1～0.3%, surplus is Fe.
2,, it is characterized in that in the chemical ingredients (weight %) Si＜0.35% according to the described low alloy steel of claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93109961 CN1028656C (en) | 1993-08-21 | 1993-08-21 | Wear-resistant low-alloy steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93109961 CN1028656C (en) | 1993-08-21 | 1993-08-21 | Wear-resistant low-alloy steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1085261A CN1085261A (en) | 1994-04-13 |
| CN1028656C true CN1028656C (en) | 1995-05-31 |
Family
ID=4987876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93109961 Expired - Fee Related CN1028656C (en) | 1993-08-21 | 1993-08-21 | Wear-resistant low-alloy steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1028656C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101725691A (en) * | 2009-12-23 | 2010-06-09 | 奇瑞汽车股份有限公司 | Method for processing cam |
| CN101851731A (en) * | 2010-04-15 | 2010-10-06 | 安徽省宁国诚信耐磨材料有限公司 | High anti-stress corrosion low-carbon alloyed martensite wear-resistant lining plate |
| CN102758276A (en) * | 2012-08-09 | 2012-10-31 | 马驰 | Double-crank mechanism applied to combing machine cylinder separation roller transmission component |
| AU2014100863A4 (en) * | 2014-07-31 | 2014-08-28 | Li, Shane Xinyang DR | High carbon content high hardness Bainite Steel |
| CN109023096A (en) * | 2018-09-17 | 2018-12-18 | 四川易亨机械制造有限公司 | A kind of high performance low-alloy steel and preparation method thereof for pitching the heart for manufacturing railway |
-
1993
- 1993-08-21 CN CN 93109961 patent/CN1028656C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1085261A (en) | 1994-04-13 |
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