CN106167881A - A kind of remnant forging thermal quenching micro alloyed steel - Google Patents
A kind of remnant forging thermal quenching micro alloyed steel Download PDFInfo
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- CN106167881A CN106167881A CN201510287342.0A CN201510287342A CN106167881A CN 106167881 A CN106167881 A CN 106167881A CN 201510287342 A CN201510287342 A CN 201510287342A CN 106167881 A CN106167881 A CN 106167881A
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Abstract
A kind of remnant forging thermal quenching micro alloyed steel, its composition and quality % be: C 0.30～0.65, Si 0.15～0.40, Mn 0.50～2.10, P≤0.035, S≤0.05, Cr 0.01～1.50, Mo≤0.35, Al 0.02～0.04, N 0.006～0.012, Ti 0.02～0.05, remaining is Fe and inevitable impurity.The present invention can effectively refine the high temperature austenite crystal grain of forging.
Description
Technical field
The invention belongs to structural alloy steel technical field, relate to a kind of remnant forging thermal quenching micro alloyed steel, specifically fit
For improving residual forging heat quenching process performance.
Background technology
The composition of quenched and tempered steel is usually carbon containing 0.25%～0.5% carbon steel or low-alloy steel and medium alloy steel, and containing one
Planting or several alloying element, have relatively low or medium alloying level, in steel, alloys producing mainly improves
The quenching degree of steel and guarantee part obtain intended combination property after high tempering.Constitutional detail on all kinds of machines is big
Amount uses quenched and tempered steel, is a most popular class steel in structural steel, and wherein, most widely used quenched and tempered steel has chromium system to adjust
Matter steel (such as 40Cr, 40CrSi), chromium manganese systems quenched and tempered steel (such as 40CrMn), chromium nickel system quenched and tempered steel (as 40CrNiMo,
37CrNi3A), boracic quenched and tempered steel etc..
Quenched and tempered steel forging normative heat treatment is to be cooled to room temperature or lower temperature at forging mostly, and overcooling austenite phase occurs
After change, reheat reaustenitizing, then quenching, high tempering by technological procedure.Remnant forging thermal quenching is then
Residuals temperatures direct quenching after utilizing forging process for fuel to shape.Comparatively speaking, residual forging heat quenching process eliminates forging
The reheating process of reaustenitizing, not only makes full use of residual forging heat, significantly saves the energy, and simplify forging
Part Technology for Heating Processing, shortens the production cycle.The extensively application of this technique can obtain significant economic benefit, is producing
Upper great application value.
It practice, residual forging heat quenching process is not used widely, its main cause is:
Compared with reheating quenching, tempering forging, remnant forging thermal quenching forging, the original austenite grain of forging is formed at
During high temperature forging, lacking the recrystallization crystal grain thinning process of reaustenitizing, therefore crystal grain is thicker, easily goes out
Existing overheated structure.
Chinese patent: publication No. is CN102383036A, date of publication is that the patent of invention on March 21st, 2012 discloses
A kind of medium carbon alloy steel being applicable to remnant forging thermal quenching, the composition proportion of this steel alloy is: C:0.25～0.55%,
Si:0.20～0.60%, Mn:0.90～1.70%, Ti:0.08～0.25%, B:0.001～0.005%, P:
≤ 0.035%, S:0.01～0.07%, surplus is Fe and inevitable impurity.Although this steel alloy is applicable to forging
Immediate quenching, but in its formula, the content of Ti is up to 0.08～0.25%, will certainly roll up liquation TiN field trash,
Cause the fatigue of materials performance of preparation and the notable deterioration of cutting ability.
Summary of the invention
It is an object of the invention to overcome the problem of residual forging heat quenching process poor-performing present in prior art, it is provided that
A kind of remnant forging thermal quenching micro alloyed steel that can significantly improve residual forging heat quenching process performance.
For realizing object above, the invention provides techniques below scheme:
A kind of remnant forging thermal quenching micro alloyed steel, the composition of described steel and quality % thereof be: C 0.30～0.65,
Si 0.15～0.40, Mn 0.50～2.10, P≤0.035, S≤0.05, Cr 0.01～1.50, Mo≤0.35,
Al 0.02～0.04, N 0.006～0.012, Ti 0.02～0.05, remaining is Fe and inevitable impurity.
Compared with prior art, the invention have the benefit that
Composition and quality % thereof of the present invention a kind of remnant forging thermal quenching micro alloyed steel be: C 0.30～0.65, Si
0.15～0.40, Mn 0.50～2.10, P≤0.035, S≤0.05, Cr 0.01～1.50, Mo≤0.35, Al 0.02～
0.04, N 0.006～0.012, Ti 0.02～0.05, remaining is Fe and inevitable impurity, the design by Ti,
The ratio of Al, N is adjusted to suitable scope, it is achieved that the combined microalloying of Ti, Al, N, the TiN of formation,
The nitride such as AlN are undissolved in high-temperature heating stage part, on the one hand, the most molten nitride Second Phase Particles can stop height
The roughening of temperature austenite crystal, on the other hand, the nitride being solid-solution in austenite can induce disperse by high temperature deformation
Separating out, can reach the purpose of refinement high temperature austenite crystal grain in conjunction with thermal deformation recrystallization process, above-mentioned effect makes in forging
Making heating-up temperature when being not higher than 1250 DEG C, the original austenite grain of forging is narrower than 4 grades, final forging temperature be 1200 DEG C～
When 950 DEG C, the original austenite grain of forging is narrower than 5 grades, reach quenched and tempered steel reheat quenched after grain size level,
The most also it is not result in forging the significantly change of cost.Therefore, the present invention can effectively refine the high temperature austenite crystalline substance of forging
Grain.
Accompanying drawing explanation
Fig. 1 is the profile of wheel hub part.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further illustrated.
A kind of remnant forging thermal quenching micro alloyed steel, the composition of described steel and quality % thereof be: C 0.30～0.65,
Si 0.15～0.40, Mn 0.50～2.10, P≤0.035, S≤0.05, Cr 0.01～1.50, Mo≤0.35,
Al 0.02～0.04, N 0.006～0.012, Ti 0.02～0.05, remaining is Fe and inevitable impurity.
Composition and the effect of steel of the present invention are as follows:
The present invention passes through Ti, Al, N combined microalloying, on the one hand, ensure that at the highest Forge Heating temperature (1250 DEG C)
The austenite grain boundary pinning that lower heating 30min is formed is in the most molten nitride, and crystal grain is narrower than 4 grades, to control forging local
The maximum crystal grain in (not deformed district), makes major part forging there is not deformed district；On the other hand so that on forging
" deformation-dynamic recrystallization district ", Direct Air-Cooled after final forging temperature insulation 10min or forging, recrystallization austenite
Grain boundary pinning is narrower than 5 grades in the most molten carbonitride and the carbonitride of deformation-induced precipitation, crystal grain, reaches to refine high temperature
The purpose of austenite crystal.
C:C is that one can be effectively increased quenching degree, it is ensured that structural alloy steel has the most basic element of sufficient intensity.Contain
Measure the lowest easy precipitation pro-eutectoid ferrite, cause cooling deficiency；The highest, plasticity and toughness reduce.For ensureing that material both had
There is higher intensity, there are again good plasticity and toughness simultaneously, its content is set as 0.30～0.65%.
Si:Si is a kind of not only to have can ensure that the strength of materials but also as the effective element of deoxidation during steel smelting, too low Si contains
Measuring and will increase deoxidation cost when making steel, too high Si content will dramatically increase decarburizing tendency, therefore be protected by Si content
Hold 0.15～0.40%.
Mn:Mn makes the S in steel fix with the form of MnS, prevents the hot short element caused because of S.Its content is little
In 0.5% time, it is unable to reach minimum performance requirement, and the segregation that too high Mn content can cause Mn increases, and increase conjunction
Gold cost, therefore its upper limit is set as 2.10%.
P:P has the effect of solution strengthening, but is easily caused toughness and deteriorates, and therefore as control of deleterious element, the upper limit sets
It is 0.035%.
S:S is easily combined generation MnS non-metallic inclusion with Mn, can refine austenite crystal during high temperature forging
Grain, the beneficially raising of toughness, MnS is mingled with beneficially raising part machinability, but sulphide inculsion is easy
Cause stress to be concentrated, reduce mechanical property, therefore S upper content limit is set as 0.05%.
Cr:Cr can improve material quenching degree and obdurability, uses with Mn Match of elemental composition, and its content is less than 0.01%,
Not reaching effect, more than 1.50%, be easily generated the carbide of Cr, reduce toughness, therefore the upper limit is set as 1.50%.
Mo:Mo allows to exist as residual elements in steel, because molybdenum-iron price is high, can dramatically increase material cost, therefore
Its content is set as≤0.35%.
Ti:Ti is a kind of strong carbide and nitride forming element, and preferentially N is combined generation TiN in steel, suitable
The Second Phase Particles of the acinous Dispersed precipitate that the Ti of amount is formed is in Forge Heating (heating-up temperature 1150 DEG C～1250 DEG C)
During pinning austenite grain boundary, stop growing up of high-temperature heating stage and Deformation recrystallization austenite crystal.Content mistake
Little, disperse second particle of formation is few, and Grain refinement is not notable, too high levels, easily generates liquation bulky grain TiN,
The effect of TiN crystal grain thinning can not be played.Therefore Ti content is set as 0.02～0.05% by the present invention.
Al: in order to reduce liquation TiN inclusion content, it is necessary to control Ti upper content limit, now solid according to [Ti] [N]
Solubility product, the TiN amounts of particles separated out during solid-state phase changes is for obtaining the austenite crystal required by deficiency.For
This needs compound interpolation other strong nitrogen, carbide formers.The present invention select cheap Al serve as this role.
Al is the main deoxidant element in steel, and Al remaining N in steel superfluous after completing deoxidation is combined generation AlN, forging
Make in heating process part not to be dissolved in austenite, with solid-state phase changes during the TiN that separates out jointly stop high temperature austenitic
Body crystal grain is grown up, the AlN being solid-solution in austenite at high temperature deformation process and deformation tailing edge austenite grain boundary disperse educt,
Postpone the carrying out of recrystallization, it is ensured that thermal deformation recrystallization Austenite Grain Refinement.For ensureing the effect of crystal grain thinning, with
Time avoid steel exists substantial amounts of non-metallic inclusion performance had negative effect, and then ensure continuous casting process performance and casting
Base surface quality, in the present invention, Al content is set as 0.02～0.04%.
N:N is that one of element often deposited by steel grade, have the strongest affinity with the unit such as Ti, Nb, Al, can be formed stable
Gap phase carbonitride, to the solid solution of carbonitride, separate out and play an important role, thus effectively stop austenite crystal
Grain roughening.In the present invention, the N content scope of design, calculate and experiment through design, can be with above-mentioned regulation content
Ti, Al formed disperse the most tiny nitride Second Phase Particles, turn avoid the volume that needs in steelmaking process
The cost that outer increase denitrification or nitrogen pick-up operation or measure cause increases, and the N of excess easily forms bubble in steel and dredges
Pine.In the present invention, N content is set as 0.006～0.012%.
Embodiment 1:
A kind of remnant forging thermal quenching micro alloyed steel, the composition of described steel and quality % thereof be: C 0.30, Si 0.40,
Mn 2.10, P 0.035, S 0.05, Cr 0.01, Mo 0.35, Al 0.02, N 0.01, Ti 0.05, remaining
For Fe and inevitable impurity.
Embodiment 2:
A kind of remnant forging thermal quenching micro alloyed steel, the composition of described steel and quality % thereof be: C 0.30, Si 0.15,
Mn 1.4, P 0.01, S 0.01, Cr 1.5, Mo 0.1, Al 0.04, N 0.012, Ti 0.04, remaining is
Fe and inevitable impurity.
Embodiment 3:
A kind of remnant forging thermal quenching micro alloyed steel, the composition of described steel and quality % thereof be: C 0.65, Si 0.23,
Mn 0.5, P 0.02, S 0.04, Cr 1.0, Mo 0.2, Al 0.027, N 0.009, Ti 0.025, remaining
For Fe and inevitable impurity.
Embodiment 4:
A kind of remnant forging thermal quenching micro alloyed steel, the composition of described steel and quality % thereof be: C 0.40, Si 0.29,
Mn 0.75, P 0.016, S 0.022, Cr 1.05, Mo 0.017, Al 0.025, N 0.006, Ti 0.02,
Remaining is Fe and inevitable impurity.
Embodiment 5:
A kind of remnant forging thermal quenching micro alloyed steel, the composition of described steel and quality % thereof be: C 0.42, Si 0.25,
Mn 0.65, P 0.019, S 0.020, Cr 1.15, Mo 0.022, Al 0.03, N 0.0085, Ti 0.03,
Remaining is Fe and inevitable impurity.
Embodiment 6:
A kind of remnant forging thermal quenching micro alloyed steel, the composition of described steel and quality % thereof be: C 0.50, Si 0.28,
Mn 0.85, P 0.020, S 0.022, Cr 0.35, Mo 0.01, Al 0.032, N 0.0076, Ti 0.02,
Remaining is Fe and inevitable impurity.
For detecting the performance of above-described embodiment steel, with existing production steel (composition and quality % be: C 0.40, Si 0.27,
Mn 1.36, P 0.016, S 0.022, Cr 0.1, Mo 0.015, N 0.004, Ti 0.03, B 0.0006)
Steel as a comparison, carries out the trial-production of car hub part, wherein, warm and hot forging heating-up temperature by itself and embodiment steel simultaneously
Being 1200～1250 DEG C, thermal forging technology process is jumping-up-blocking-finish-forging-immediate quenching-temper, and warm and hot forging obtains
The profile of wheel hub part as it is shown in figure 1, measure difference according to GB/T 6394 metal mean grain size assay method
Compare after the grain size at position, the results are shown in Table 1:
Table 1
Discovery can be compared by upper table, after Al, Ti, N combined microalloying, remnant forging thermal quenching wheel hub part
Each position grain size is all narrower than the immediate quenching wheel hub part of existing production material.
Claims (1)
1. a remnant forging thermal quenching micro alloyed steel, it is characterised in that:
The composition of described steel and quality % thereof be: C 0.30～0.65, Si 0.15～0.40, Mn 0.50～2.10, P≤0.035, S≤0.05, Cr 0.01～1.50, Mo≤0.35, Al 0.02～0.04, N 0.006～0.012, Ti 0.02～0.05, remaining is Fe and inevitable impurity.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371322A (en) * | 2018-11-07 | 2019-02-22 | 邯郸钢铁集团有限责任公司 | Meet half axle-steel and its manufacturing method of immediate quenching technique |
| CN112251664A (en) * | 2020-09-28 | 2021-01-22 | 无锡市法兰锻造有限公司 | Ultra-fine grain alloy steel forging and manufacturing method thereof |
| CN112981260A (en) * | 2021-02-08 | 2021-06-18 | 上海振华港机重工有限公司 | Container crane wheel steel, container crane wheel and preparation method of container crane wheel steel |
| WO2023184782A1 (en) * | 2022-04-01 | 2023-10-05 | 南京钢铁股份有限公司 | Manufacturing method for hot forging-formed, composite-quenched and structure-refined high-strength bolt |
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| JP2013151719A (en) * | 2012-01-25 | 2013-08-08 | Nippon Steel & Sumitomo Metal Corp | Rolled steel bar or wire rod for hot forging |
| CN104178613A (en) * | 2014-08-07 | 2014-12-03 | 山东金马工业集团股份有限公司 | Controllable cooling method for high-pressure common rail |
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| CN101283109A (en) * | 2005-10-07 | 2008-10-08 | 都美工业株式会社 | Process for manufacturing roller shell of lower running body of construction machine |
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| JP2013151719A (en) * | 2012-01-25 | 2013-08-08 | Nippon Steel & Sumitomo Metal Corp | Rolled steel bar or wire rod for hot forging |
| CN104178613A (en) * | 2014-08-07 | 2014-12-03 | 山东金马工业集团股份有限公司 | Controllable cooling method for high-pressure common rail |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371322A (en) * | 2018-11-07 | 2019-02-22 | 邯郸钢铁集团有限责任公司 | Meet half axle-steel and its manufacturing method of immediate quenching technique |
| CN112251664A (en) * | 2020-09-28 | 2021-01-22 | 无锡市法兰锻造有限公司 | Ultra-fine grain alloy steel forging and manufacturing method thereof |
| CN112981260A (en) * | 2021-02-08 | 2021-06-18 | 上海振华港机重工有限公司 | Container crane wheel steel, container crane wheel and preparation method of container crane wheel steel |
| WO2022166155A1 (en) * | 2021-02-08 | 2022-08-11 | 上海振华港机重工有限公司 | Container crane wheel steel, wheel and preparation method therefor |
| WO2023184782A1 (en) * | 2022-04-01 | 2023-10-05 | 南京钢铁股份有限公司 | Manufacturing method for hot forging-formed, composite-quenched and structure-refined high-strength bolt |
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