CN105018698A - Medium-carbon non-tempered steel post-forging temperature controlling and cooling method - Google Patents
Medium-carbon non-tempered steel post-forging temperature controlling and cooling method Download PDFInfo
- Publication number
- CN105018698A CN105018698A CN201510443019.8A CN201510443019A CN105018698A CN 105018698 A CN105018698 A CN 105018698A CN 201510443019 A CN201510443019 A CN 201510443019A CN 105018698 A CN105018698 A CN 105018698A
- Authority
- CN
- China
- Prior art keywords
- forging
- cooling
- cooled
- temperature
- air
- 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
Abstract
The invention relates to the technical field of steel element post-forging controlling and cooling, in particular to a medium-carbon non-tempered steel post-forging temperature controlling and cooling method. The medium-carbon non-tempered steel post-forging temperature controlling and cooling method includes the following steps that firstly, a forged forging is air-cooled or wind-cooled to 460+/-20 DEG C; secondly, mist spray cooling is conducted on the air-cooled or wind-cooled forging until the forging is cooled to 200+/-20 DEG C; and thirdly, the forging subjected to mist spray cooling in the second step is air-cooled to a room temperature. The method can solve the problem that martensite or bainite and other abnormal structure defects are easily generated on the surfaces of products during mist cooling in a high-temperature stage. By means of the quick cooling mode of mist spray cooling in a low-temperature stage after the temperature of 460+/-20 DEG C, on the premise that the metallographic structure and machining performance of the forging are not affected, strength and impact performance of the forging are improved easily, and performance stability of a product is better improved. The method has the advantages that the process application range is wide, product strength and impact toughness are good, and process maneuverability and stability are good.
Description
Technical field
The present invention relates to the rear controlled cooling technique field of steel part forging, be specifically related to the rear temperature-controlled cooling method of carbon non-hardened and tempered steel forging in one.
Background technology
Non-hardened and tempered steel forging adopts forging working hardening and heat treatment reinforcement method, air cooling or air-cooled after forging, adopts few heating or without the hardness of heated for controlling temperature process for cooling adjustment forging, metallographic structure and mechanical property, reaches the performance requriements of forging.The topmost feature of non-hardened and tempered steel forging is that the good and size distortion of low cost of manufacture, machinability is little etc., and in the products such as bent axle, connecting rod, steering knuckle, diesel injection system and three generations's wheel hub, there is extensive application the Micro Alloying steel capital.
Conventional non-hardened and tempered steel forging temperature control process for cooling is: air cooling or air-cooled to less than 400 DEG C dress basket air coolings after forging, its performance is by material composition, forging process and cooling control technology impact, when the higher particularly On Impact Toughness of mechanical property requirements has requirement, conventional temperature control process for cooling is by air cooling or the low restriction of air-cooled speed of cooling, adjusting performance narrow range, and in the method that high temperature section adopts mist cold, although can hardness be improved, intensity and impelling strength, but easily produce martensite at piece surface because mist is cold, the abnormal structures such as bainite affect machinability, the cold defect that there is product performance instability of high temperature section mist.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of applicable setting range wider, neither affecting the machinability of forging, effectively can improve again the intensity of forging and the rear temperature-controlled cooling method of middle carbon non-hardened and tempered steel forging of impelling strength.
For realizing above-mentioned technical purpose, the present invention adopts following technical scheme:
Temperature-controlled cooling method after middle carbon non-hardened and tempered steel forging, comprises the steps:
Step one, by the forging air cooling or air-cooled to 460 ± 20 DEG C after forging;
Step 2, by step one air cooling or air-cooled after forging spray cooling to 200 ± 20 DEG C;
Step 3, by the forging air cooling after step 2 spray cooling to room temperature.
Wherein,
In step one, when adopting air cooling way, speed of cooling is not more than 1.5 degree/second as far as possible, preferably controls 1 ~ 1.5 degree/second, to improve the homogeneity of forging metallographic structure, improves the stability of product;
In step 2, when adopting spray cooling mode, speed of cooling is preferably not less than 20 degree/second.
As preferably, by the forging air cooling or air-cooled to 460 ± 10 DEG C after forging, then spray cooling to 200 ± 10 DEG C.Using 460 DEG C as stagnation point, more than 460 DEG C, hot stage adopts air cooling or the air-cooled low speed type of cooling, under the prerequisite not affecting forging grain structure, below 460 DEG C, cold stage adopts the cold raising speed of cooling of mist, thus improve intensity and the impact property of forging, improve product stability.
Temperature-controlled cooling method after the forging of carbon non-hardened and tempered steel in this, there is at least following beneficial effect: the product surface when hot stage mist is cold can be avoided easily to produce the problem of the abnormal structure such as martensite or bainite defect, the rapid cooling mode of spray cooling is carried out by the cold stage after 460 ± 20 DEG C, under the prerequisite of the metallographic structure and machinability that do not affect forging, be beneficial to the intensity and impact property that improve forging, be beneficial to the stability improving product.Have that the technique scope of application is wide, product strength and impelling strength is good, the advantage such as process operability and good stability.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein:
Fig. 1 is the structural representation of temperature control cooling apparatus in the embodiment of the present invention;
Fig. 2 is that the present invention forges in rear temperature-controlled cooling method and prior art the forging temperature variation correlation curve figure forging rear temperature-controlled cooling method.
In figure: 11-equipment entrance; 12-cooling blower; 13-temperature monitor; 14-mist cold water pipe; 15-equipment exports.
Embodiment
Below in conjunction with drawings and Examples, set forth the present invention further.In the following detailed description, the mode only by illustrating describes some one exemplary embodiment of the present invention.Accompanying drawing is illustrative with being described in essence, instead of for limiting the protection domain of claim.
Below for middle carbon non-hardened and tempered steel bar, the rear temperature-controlled cooling method of carbon non-hardened and tempered steel forging in the present invention is described.
(1) blanking: adopt the equipment such as sawing machine or cutting machine to carry out blanking processing to bar;
(2) heating in medium frequency: bar is heated according to processing parameter, Heating temperature 1150 ~ 1250 DEG C, heating beat 10 ~ 30 seconds;
(3) die forging: the bar that heating in medium frequency is good is put into mould forging molding;
(4) trimming: excision hot forging overlap;
(5) hot shaping: hot forging is shaping adjust size on sizing die;
(6) temperature-controlled cooling method of the present invention is adopted to carry out temperature control cooling the forging after above-mentioned steps forging; Please refer to Fig. 1 and Fig. 2, comprise the steps:
Step one S1, forging after forging is inserted from the equipment entrance 11 of temperature control cooling apparatus, according to technical arrangement plan cooling blower 12 travelling speed and cooling system, under the detection of temperature monitor 13, air-cooled to 460 ± 20 DEG C, if can control at 460 ± 10 DEG C best, using 460 DEG C as high/low temperature section dividing point, adopt different cooling, both the product surface when hot stage mist is cold can have been avoided easily to produce the problem of the abnormal structure such as martensite or bainite defect, be beneficial to again the intensity and impact property that improve forging; Speed of cooling is not more than 1.5 degree/second as far as possible, preferably controls 1 ~ 1.5 degree/second, to improve the homogeneity of forging metallographic structure further, improves the stability of product; Air cooling mode can certainly be adopted to realize above-mentioned effect.
Step 2 S2, passes through mist cold water pipe 14 spray cooling (mist is cold) to 200 ± 20 DEG C by the forging after air-cooled for step one S1, is preferably cooled to 200 ± 10 DEG C; Speed of cooling is preferably not less than 20 degree/second.
Step 3 S3, the equipment outlet 15 of the forging after step 2 S2 spray cooling from temperature control cooling apparatus taken out, dress basket air cooling is to room temperature.
Fig. 2 shows and adopts the present invention to forge in rear temperature-controlled cooling method and prior art the forging temperature variation correlation curve forging rear temperature-controlled cooling method, the rapid cooling mode of spray cooling is carried out by the cold stage after 460 ± 20 DEG C, the product surface when hot stage mist is cold can be avoided easily to produce the problem of the abnormal structure such as martensite or bainite defect, under the prerequisite of the metallographic structure and machinability that do not affect forging, be beneficial to the intensity and impact property that improve forging, be beneficial to and improve the stability of product, and process operability and good stability.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (5)
1. in, temperature-controlled cooling method after the forging of carbon non-hardened and tempered steel, is characterized in that, comprise the steps:
Step one, by the forging air cooling or air-cooled to 460 ± 20 DEG C after forging;
Step 2, by step one air cooling or air-cooled after forging spray cooling to 200 ± 20 DEG C;
Step 3, by the forging air cooling after step 2 spray cooling to room temperature.
2. temperature-controlled cooling method after middle carbon non-hardened and tempered steel forging as claimed in claim 1, is characterized in that: in step one, by the forging air cooling or air-cooled to 460 ± 10 DEG C after forging.
3. temperature-controlled cooling method after middle carbon non-hardened and tempered steel forging as claimed in claim 1, it is characterized in that: in step one, when adopting air cooling way, speed of cooling is not more than 1.5 degree/second.
4. in as claimed in claim 1, temperature-controlled cooling method after the forging of carbon non-hardened and tempered steel, is characterized in that: in step 2, by step one air cooling or air-cooled after forging spray cooling to 200 ± 10 DEG C.
5. temperature-controlled cooling method after middle carbon non-hardened and tempered steel forging as claimed in claim 1, it is characterized in that: in step 2, when adopting spray cooling mode, speed of cooling is not less than 20 degree/second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443019.8A CN105018698A (en) | 2015-07-24 | 2015-07-24 | Medium-carbon non-tempered steel post-forging temperature controlling and cooling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443019.8A CN105018698A (en) | 2015-07-24 | 2015-07-24 | Medium-carbon non-tempered steel post-forging temperature controlling and cooling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105018698A true CN105018698A (en) | 2015-11-04 |
Family
ID=54408996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510443019.8A Pending CN105018698A (en) | 2015-07-24 | 2015-07-24 | Medium-carbon non-tempered steel post-forging temperature controlling and cooling method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105018698A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111763870A (en) * | 2019-04-02 | 2020-10-13 | 陕西蓝通传动轴有限公司 | Application of tempering-free steel, and blending and preparation method of tempering-free steel |
| CN114277318A (en) * | 2021-12-14 | 2022-04-05 | 江苏铸鸿锻造有限公司 | Large-size ferrite-pearlite non-quenched and tempered steel forged rod |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07145425A (en) * | 1994-05-20 | 1995-06-06 | Nkk Corp | Production of high-strength high-toughness non-tempered steel |
| CN101302601A (en) * | 2008-07-01 | 2008-11-12 | 上海大学 | High-strength tough large-cross section non-quenched and tempered steel rod and preparation thereof |
| CN102071368A (en) * | 2011-01-30 | 2011-05-25 | 钢铁研究总院 | Medium carbon non-quenched and tempered steel used in low-cost forging |
-
2015
- 2015-07-24 CN CN201510443019.8A patent/CN105018698A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07145425A (en) * | 1994-05-20 | 1995-06-06 | Nkk Corp | Production of high-strength high-toughness non-tempered steel |
| CN101302601A (en) * | 2008-07-01 | 2008-11-12 | 上海大学 | High-strength tough large-cross section non-quenched and tempered steel rod and preparation thereof |
| CN102071368A (en) * | 2011-01-30 | 2011-05-25 | 钢铁研究总院 | Medium carbon non-quenched and tempered steel used in low-cost forging |
Non-Patent Citations (1)
| Title |
|---|
| 中国锻压协会: "《汽车典型锻件生产》", 31 October 2009 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111763870A (en) * | 2019-04-02 | 2020-10-13 | 陕西蓝通传动轴有限公司 | Application of tempering-free steel, and blending and preparation method of tempering-free steel |
| CN114277318A (en) * | 2021-12-14 | 2022-04-05 | 江苏铸鸿锻造有限公司 | Large-size ferrite-pearlite non-quenched and tempered steel forged rod |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101792176B1 (en) | Method and device for producing a metal component | |
| US6743311B2 (en) | Forging method | |
| US20090126451A1 (en) | Hot Forging Facility | |
| CN103205551A (en) | Thermal treatment processing method of thrust wheel | |
| CN103753138A (en) | Production method of railway wheels | |
| CN103350116B (en) | A kind of rolling mill practice being conducive to Cr, Mo steel ball annealing | |
| CN105018698A (en) | Medium-carbon non-tempered steel post-forging temperature controlling and cooling method | |
| CN105714027A (en) | Heat treatment process for hardening and tempering of 45 steel | |
| CN102191358B (en) | GCr15 high-carbon chromium bearing steel hot forging billet waste heat temperature control ball annealing technology | |
| CN107447086B (en) | A kind of vacuum heat treatment process of FV520B-S steel | |
| CN106755805A (en) | A kind of heat treatment after forging technique of low-alloy carburizing steel | |
| CN106480261B (en) | A kind of heat treatment method of think gauge mould steel | |
| KR20100091973A (en) | A process for forming steel | |
| CN113430337A (en) | Integral quenching and tempering heat treatment method for H13 round steel | |
| CN105886736A (en) | Thermal treatment method for large-section axle-type forge pieces | |
| KR101557086B1 (en) | Method of ferrite pearlite annealing heat treatment before cold forging for automotive steel | |
| CN101598172A (en) | A kind of eccentric shaft and manufacture method thereof | |
| KR101284294B1 (en) | Producing method for non quenched and tempered steel product | |
| CN111549306B (en) | Preparation method of ultrahigh-strength titanium alloy hot-rolled bar | |
| CN114921638A (en) | Accurate heat treatment method for low-carbon low-alloy high-strength thin steel plate | |
| JP2013204085A (en) | Method for producing metal molding | |
| KR20030008852A (en) | High strength bainitic microalloyed steel for automotive chassy component | |
| CN106119502A (en) | A kind of die quenching conditioning treatment technique | |
| CN104611516A (en) | Steering knuckle forging heat treatment processing method | |
| CN115074494B (en) | Heat treatment method of steel for rod mill |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151104 |
|
| RJ01 | Rejection of invention patent application after publication |