CN105714045A - Heat treatment process for axle steel - Google Patents
Heat treatment process for axle steel Download PDFInfo
- Publication number
- CN105714045A CN105714045A CN201410740454.2A CN201410740454A CN105714045A CN 105714045 A CN105714045 A CN 105714045A CN 201410740454 A CN201410740454 A CN 201410740454A CN 105714045 A CN105714045 A CN 105714045A
- Authority
- CN
- China
- Prior art keywords
- steel
- temperature
- axle
- axle steel
- normalizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a heat treatment process for axle steel. The heat treatment process for the axle steel includes the following steps that (1) primary normalizing is conducted, specifically, the temperature is 840-880 DEG C, heat preservation time is 3-5 hours, and then the axle steel is cooled to 500 DEG C or below; (2) secondary normalizing is conducted, specifically, the temperature is 800-840 DEG C, heat preservation time is 3-5 hours, and then the axle steel is cooled to 250 DEG C or below; and (3) tempering is conducted, specifically, the temperature is 660-690 DEG C, heat preservation time is 3-5 hours, and then the axle steel is cooled to the room temperature. The invention further discloses an axle prepared through the heat treatment process. The problem that no heat treatment process is matched with existing 41CrMo steel is solved, the toughness of the axle steel is improved while the strength of the 41CrMo steel is guaranteed, and the overall performance of the axle subjected to heat treatment is substantially improved.
Description
Technical field
The present invention relates to metallurgical technology, particularly relate to the Technology for Heating Processing of a kind of axle steel.
Background technology
Axletree is the crucial running part of railway freight-car, and its performance is to ensure that the essential condition that vehicle safety runs, and concerns state-owned railroads transportation safety.The lorry axle of current various countries is essentially all employing and develops LZ50 steel axletree the nineties in last century, and the axle weight of railway freight-car has been upgraded to present 35.7t from original 21t, 25t, the toughness of the existing LZ50 steel axletree ability of energy (material absorb in plastic deformation and fracture process) cannot meet the needs of continuous speed-raising, heavy duty goods train.
Summary of the invention
It is an object of the invention to, for the problem of above-mentioned Technology for Heating Processing, it is proposed to the Technology for Heating Processing of a kind of axle steel, with the advantage that the axletree realizing preparing has high intensity and high tenacity.
For achieving the above object, the technical solution used in the present invention is: the Technology for Heating Processing of a kind of axle steel, comprises the following steps:
(1) normalizing: temperature 840-880 DEG C, temperature retention time 3-5 hour, is subsequently cooled to less than 500 DEG C；
(2) secondary normalizing: temperature 800-840 DEG C, temperature retention time 3-5 hour, is subsequently cooled to less than 250 DEG C；
(3) tempering: temperature 660-690 DEG C, temperature retention time 3-5 hour, is subsequently cooled to room temperature.
Further, a described normalizing: temperature 860-870 DEG C, temperature retention time 3-5 hour, then cooling less than 500 DEG C.
Further, described secondary normalizing: temperature 820-830 DEG C, temperature retention time 3-5 hour, it is subsequently cooled to less than 250 DEG C.
Further, described tempering: temperature 670-680 DEG C, temperature retention time 3-5 hour, it is subsequently cooled to room temperature.
Further, a described normalizing rate of cooling is for be cooled to less than 500 DEG C by axle steel at 40-60min.
Further, described secondary normalizing rate of cooling is for be cooled to less than 250 DEG C by axle steel at 80-120min.
Further, the programming rate of a described normalizing and secondary normalizing is 2-10 DEG C/min.
Another object of the present invention also discloses a kind of axletree, adopts above-mentioned Technology for Heating Processing to be prepared from.
The invention discloses the Technology for Heating Processing of a kind of axle steel, by tempering of double normalizing, obtain grain size and uniformly refine, and the 41CrMo steel axletree that intensity is high, toughness is high, meet the needs of constantly speed-raising, heavy duty goods train.
Detailed description of the invention
For meeting the needs of the constantly railway freight-car of innovation, have developed Novel axle 41CrMo steel, the chemical composition of 41CrMo steel is as shown in table 3.
The chemical composition (surplus is ferrum and other inevitable elements) of table 341CrMo steel
Carbon component is the important element affecting steel performance, although steel can be played good invigoration effect by the increase of carbon content, but significantly reduce the toughness of steel, in order to improve railway operation safety, axles steel of the present invention suitably reduces the carbon content in component, and while reducing carbon content, improved the intensity of axle steel by alloying.Preferably, C0.38-0.41% in described axle steel.
Turn down Si, Mn constituent content upper limit while carbon content in reducing axle steel component, the toughness of steel can be improved.Preferably, Mn0.60-0.70% in described axle steel.Axle steel of the present invention comprises the Cr of 0.90-1.2%, can increase the quenching degree of axle steel, promotes to obtain more uniform tissue on the axletree cross section after quenching and tempering so that it is have anticorrosive antioxidation, antiacid, wear-resisting and fatigue proof advantage.
Preferably, Cr1.0-1.1% in axle steel, but in axle steel add Cr element can make axle steel 250-450 DEG C temper brittleness sensitivity strengthen, namely while temper brittleness transition temperature rises, the impact value of Ductile rupture and Fracture Toughness decline, the present invention, by air-cooled after tempering, eliminates temper brittleness.By adding the Mo of 0.15-0.30% in axle steel, crystal grain can be promoted to refine further, improve the mechanical property of axle steel, it is preferred that Mo0.20-0.25% in described axle steel.Increase Cr and Mo constituent content, be conducive to supplementing the decline of hardness of steel, improve toughness and ductility simultaneously.
Axle steel of the present invention comprises the Ni of 0.10-0.25%, while improving hardness of steel, can improve acid-resisting and the toughness of axle steel, and the mechanism improving toughness is to make material matrix be prone to cross-slip at low temperatures.
Axle steel of the present invention comprises the Alt of 0.020-0.050%, V with 0.07-0.12%, can avoid because of grain size alligatoring, there are the quality problems of open grain structure when normalizing in axletree, make steel is formed the infusible compound-ALN (aluminium nitride) of enough tiny Dispersed precipitate, Austenite Grain Growth, axle steel crystalline grains degree rank > of the present invention 6 grades, 1-2 level higher than LZ50 crystalline grain of steel degree level is stoped together with tiny, the carbon of disperse, nitride V (C, N).Adding that Al constituent content is controlled is tight, it is ensured that the deoxidation amount of molten steel, ensure that aluminium nitride appropriate in molten steel simultaneously, does not affect again the toughness of steel while crystal grain thinning.The interpolation of V element also can improve intensity and the toughness of steel.
Add and control the content of Cr, Cu, Mo element, wearability and the corrosion resistance of steel can be improved.Reducing P, S content, for making axletree have required mechanical property, physical property and chemical property, except reasonable selection 41CrMo steel and forming axle technique, rational Technology for Heating Processing is also requisite.Heat-Treatment of Steel technique be placed in certain medium to heat metal material, insulation, cooling, by changing the metallurgical structure of material surface or inside, control a kind of metal fever processing technique of its performance.
The invention provides the Technology for Heating Processing of a kind of axle steel, concrete provides a kind of axletree 41CrMo Heat-Treatment of Steel technique, comprises the following steps:
First by 41CrMo steel forging forming, then successively the steel part of forging forming is carried out a normalizing, secondary normalizing and a tempering；
Normalizing: by axle steel at temperature 840-880 DEG C, is incubated 3-5 hour, is subsequently cooled to less than 500 DEG C；Preferably, a described normalizing: by axle steel at temperature 860-870 DEG C, it is incubated 3-5 hour, is subsequently cooled to less than 500 DEG C；An above-mentioned normalizing rate of cooling is for be cooled to less than 500 DEG C by axle steel at 40-60min, so that axle steel is quickly cooled to below austenite, is beneficial to grain refinement and distribution of carbides homogenization.This cool time can be adjusted according to the thickness of axletree.Under the premise that steel part is heated evenly, in order to shorten the heat treatment cycle of axle steel, in the present invention, the programming rate of a normalizing is 4 DEG C/min.
Secondary normalizing: by axle steel at temperature 800-840 DEG C, is incubated 3-5 hour, is subsequently cooled to less than 250 DEG C；Preferably, described secondary normalizing: by axle steel at temperature 820-830 DEG C, temperature retention time 3-5 hour, it is subsequently cooled to less than 250 DEG C；Above-mentioned secondary normalizing rate of cooling is for be cooled to less than 250 DEG C by axle steel at 80-120min, and this cool time, the thickness also dependent on axletree was adjusted.
Under the premise that steel part is heated evenly, in order to shorten the heat treatment cycle of axle steel, in the present invention, the programming rate of secondary normalizing is 4 DEG C/min.Axletree of the present invention adopts double normalizing reason: forging product is too high due to Forge Heating temperature, and generally accurately do not control, therefore after forging, the tissue in forging and grain size are very uneven, by first time normalizing, adjust tissue and the grain size of forging, make its homogenization, adopt the temperature that temperature is slightly less than a normalizing to carry out secondary normalizing afterwards, to improve the performance of forging further.
Tempering: by axle steel at temperature 660-690 DEG C, is incubated 3-5 hour, is subsequently cooled to room temperature.Preferred described tempering: by axle steel at temperature 670-680 DEG C, temperature retention time 3-5 hour, is subsequently cooled to room temperature.
It is further appreciated that above-mentioned cooling can adopt air cooling, water-cooled, spray cooling or other conventional chilling modes.
Claims (7)
1. the Technology for Heating Processing of an axle steel, it is characterised in that comprise the following steps:
(1) normalizing: temperature 840-880 DEG C, temperature retention time 3-5 hour, is subsequently cooled to less than 500 DEG C；
(2) secondary normalizing: temperature 800-840 DEG C, temperature retention time 3-5 hour, is subsequently cooled to less than 250 DEG C；
(3) tempering: temperature 660-690 DEG C, temperature retention time 3-5 hour, is subsequently cooled to room temperature.
2. the Technology for Heating Processing of axle steel according to claim 1, it is characterised in that described one time normalizing temperature 860-870 DEG C, temperature retention time 3-5 hour, then cooling less than 500 DEG C.
3. the Technology for Heating Processing of axle steel according to claim 1, it is characterised in that described secondary normalizing temperature 820-830 DEG C, temperature retention time 3-5 hour, is subsequently cooled to less than 250 DEG C.
4. the Technology for Heating Processing of axle steel according to claim 1, it is characterised in that described temperature 670-680 DEG C, temperature retention time 3-5 hour, be subsequently cooled to room temperature.
5. the Technology for Heating Processing of axle steel according to claim 1, it is characterised in that a described normalizing rate of cooling is: at 40-60min, axle steel is cooled to less than 500 DEG C.
6. the Technology for Heating Processing of axle steel according to claim 1, it is characterised in that described secondary normalizing rate of cooling is: at 80-120min, axle steel is cooled to less than 250 DEG C.
7. the Technology for Heating Processing of axle steel according to claim 1, it is characterised in that the programming rate of a described normalizing and secondary normalizing is 2-10 DEG C/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410740454.2A CN105714045A (en) | 2014-12-05 | 2014-12-05 | Heat treatment process for axle steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410740454.2A CN105714045A (en) | 2014-12-05 | 2014-12-05 | Heat treatment process for axle steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105714045A true CN105714045A (en) | 2016-06-29 |
Family
ID=56144249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410740454.2A Pending CN105714045A (en) | 2014-12-05 | 2014-12-05 | Heat treatment process for axle steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105714045A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107937676A (en) * | 2017-12-25 | 2018-04-20 | 株洲中车天力锻业有限公司 | A kind of EA1N axles steel heat treatment process |
-
2014
- 2014-12-05 CN CN201410740454.2A patent/CN105714045A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107937676A (en) * | 2017-12-25 | 2018-04-20 | 株洲中车天力锻业有限公司 | A kind of EA1N axles steel heat treatment process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103014296B (en) | Thermal treatment process for axle steel | |
| WO2015197007A1 (en) | Carburized alloy steel, method for preparing same, and use thereof | |
| CN103014516B (en) | Borated low-alloy high-speed steel roller and manufacturing method thereof | |
| WO2018001333A1 (en) | Low alloy cast steel, smelting method and heat treatment method therefor, and railway locomotive parts | |
| CN109280849A (en) | A kind of high performance hot-work die steel and its manufacturing process | |
| AU2017295527B2 (en) | A hypereutectoid rail and manufacturing method thereof | |
| CN103397267A (en) | Cold roll for rolling lithium battery guard plate and manufacturing method thereof | |
| CN102912236A (en) | High-performance and abrasion-resistant hot work die steel and technology for manufacturing same | |
| WO2018001355A1 (en) | Low alloy cast steel, heat treatment method therefor and use thereof in railway industry | |
| CN103014535B (en) | Axle steel and axletree | |
| CN107974639B (en) | High-toughness multi-element alloy wear-resistant steel ball and preparation method thereof | |
| CN101210302A (en) | Middle and low carbon bainite high-strength high-ductility steel and manufacturing method thereof | |
| CN106435367B (en) | A kind of bainite rail and preparation method thereof | |
| CN105002439A (en) | Wear-resistant steel with 400-level Brinell hardness and manufacturing method thereof | |
| CN110205542A (en) | A kind of cold roll tool steel and preparation method thereof | |
| CN108103302A (en) | A kind of cold roll whole heat treatment process | |
| CN105483555B (en) | Spring steel and preparation method thereof and heat treatment method | |
| CN106756619A (en) | A kind of high-toughness high-strength abrasion-proof steel ball and preparation method thereof | |
| CN105177430A (en) | Alloy tool steel and production method thereof | |
| WO2016107517A1 (en) | High wear-resistant alloy steel for railway frog and manufacturing method therefor | |
| CN106480372A (en) | A kind of 8.8 grades of securing members non-quenched cold heading steel wire rod and its production methods | |
| CN104946965A (en) | Spheroidal graphite cast steel roller and preparing method thereof | |
| CN105714045A (en) | Heat treatment process for axle steel | |
| CN104264070B (en) | A kind of Thin Specs X80 pipe line steel and manufacture method thereof | |
| CN105779719A (en) | Thermal treatment process for axle shaft steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160629 |