CN102605315A - Heat treatment process for improving performance of nitrocarburizing strengthening layer of steel material workpiece - Google Patents
Heat treatment process for improving performance of nitrocarburizing strengthening layer of steel material workpiece Download PDFInfo
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- CN102605315A CN102605315A CN2011100269796A CN201110026979A CN102605315A CN 102605315 A CN102605315 A CN 102605315A CN 2011100269796 A CN2011100269796 A CN 2011100269796A CN 201110026979 A CN201110026979 A CN 201110026979A CN 102605315 A CN102605315 A CN 102605315A
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Abstract
The invention discloses a heat treatment process for improving the performance of a nitrocarburizing strengthening layer of a steel material workpiece, which mainly comprises the steps of austenitizing at 690-710 DEG C and isothermally aging at 220-230 DEG C. The heat treatment process disclosed by the invention is easy to operate and implement and can improve the performance of the nitrocarburizing surface strengthening layer of the steel material workpiece. The hardness and the wear resistance of the steel material workpiece treated by adopting the heat treatment process are improved significantly.
Description
Technical field
The present invention relates to a kind of metal material surface treatment process, be specifically related to improve the thermal treatment process of steel workpiece carbonitriding strengthening layer performance.
Background technology
Development of modern industry is increasingly high to material performance requirement, not only requires material matrix to have high-intensity high-tenacity but also require the surface to have higher hardness, wear resistance, erosion resistance etc.Nitrogenize has had the wide application of sending out aborning as a kind of effective surface strengthening technology, and for example tool and mould is surfaces nitrided.The method of nitriding has many kinds, is divided into gas nitriding, solid nitriding, liquid nitriding, ionitriding and carbonitriding etc.Wherein carbonitriding is tufftride again and generally carries out at low temperatures.According to different media, tufftride is divided into gas soft nitriding, liquid tufftriding, ion soft-nitriding etc. again.Although tufftride is simple to operate, efficient is higher, and nitride layer approaches and occurs sometimes defectives such as column crystal or vein structure occurring in hardness not enough (mainly appearing on the workpiece of low alloy steel) or the nitridation process.These can cause some nitrogenize workpiece nitride layer thin or nitride layer hardness is not enough or crisp and become waste product.
Summary of the invention
Technical problem to be solved by this invention is: to the deficiency of prior art, a kind of simple to operate, thermal treatment process of being easy to realize and can effectively improve steel workpiece carbonitriding surface strengthen layer performance is provided.
For solving the problems of the technologies described above; The present invention has proposed following four kinds of different techniques schemes according to the difference of process object; Every technical scheme all is to be the basis with increase austenitizing treatment process and isothermal aging treatment process behind the carbonitriding, and each technical scheme all belongs to a total inventive concept.Each technical scheme is following:
Scheme one: a kind of thermal treatment process that improves soft steel workpiece carbonitriding strengthening layer performance, this technology may further comprise the steps:
(1) austenitizing is handled: the soft steel workpiece behind carbonitriding is carried out austenitizing handle, the treatment time is 0.5h～9h (preferred 2h～9h);
(2) isothermal aging is handled: the workpiece after austenitizing is handled is carried out the isothermal aging processing again, accomplish thermal treatment process.
Scheme two: a kind of thermal treatment process that improves medium carbon steel workpiece carbonitriding strengthening layer performance, this technology may further comprise the steps:
(1) austenitizing is handled: the medium carbon steel workpiece behind carbonitriding is carried out austenitizing handle, the treatment time is 0.5h～2.5h (preferred 40min～2h);
(2) isothermal aging is handled: will carry out isothermal aging through the workpiece that austenitizing is handled again and handle, and accomplish thermal treatment process.
Scheme three: a kind of thermal treatment process that improves high carbon steel workpiece carbonitriding strengthening layer performance, this technology may further comprise the steps:
(1) austenitizing is handled: the high carbon steel workpiece behind carbonitriding is carried out the austenitizing processing, and the treatment time is 0.5h～4h;
(2) isothermal aging is handled: will carry out isothermal aging through the workpiece that austenitizing is handled again and handle, and accomplish thermal treatment process.
Scheme four: a kind of thermal treatment process that improves high carbon alloy steel workpiece carbonitriding strengthening layer performance, this technology may further comprise the steps:
(1) austenitizing is handled: the high carbon alloy steel workpiece behind carbonitriding is carried out the austenitizing processing, and the treatment time is 0.5h～2 h;
(2) isothermal aging is handled: will carry out isothermal aging through the workpiece that austenitizing is handled again and handle, and accomplish thermal treatment process.
As the further improvement to above-mentioned each technical scheme, the austenitizing technological processes is preferably: (fused salt is preferably NaCl, BaCl will the workpiece behind carbonitriding to put into 700 ℃ ± 10 ℃ fused salt
2And CaCl
2Mixing salt) or vacuum in carry out austenitizing and handle, after being incubated by above-mentioned each treatment time, the water-cooled of coming out of the stove.
As further improvement to above-mentioned each technical scheme; The isothermal aging technological processes is preferably: will put into 225 ℃ ± 5 ℃ oil bath furnace through the workpiece that austenitizing is handled and carry out isothermal aging and handle; Insulation 6h～14h goes out the oil bath furnace water-cooled with said workpiece again, accomplishes and handles.
In above-mentioned each technical scheme, workpiece is carried out choosing of soaking time that austenitizing handles, the performance of workpiece is had very significant effects.The soaking time that the austenitizing of above-mentioned each technical scheme is handled is mainly confirmed through following test:
Scheme one is to adopt the 08F steel as the soft steel sample, is divided into 9 groups and makes an experiment.Earlier each soft steel sample is carried out the plasma carbonitriding and handle (handling 5h gets final product); At this moment, reserve one group, no longer carry out subsequent disposal as control samples; 8 groups of remaining samples are all put into 700 ℃ of fused salts and are carried out the austenitizing processing; Be incubated 0.5h, 1h, 2h, 4h, 5h, 6h, 7h, 9h then respectively, insert 225 ℃ of oil bath furnaces at last and carry out the isothermal aging processing, water-cooled is to room temperature behind the insulation 14h.At ambient temperature; (trier is a HXD-1000T type Vickers testing machine for the hardness of 8 groups of sample workpiece of detection control samples and aforementioned processing and thickness of strengthened layer; Experiment load is 4.9N; Time length is 15s, and each numerical value is got 8 TP MVs), Hardness results is referring to Fig. 2.Can be known that by Fig. 2 along with the prolongation in austenitizing treatment time, the hardness of 08F steel sample workpiece increases gradually, reach peak value during insulation 5h, along with the continuation prolongation of soaking time, hardness begins to reduce, and when insulation 9h, hardness value still is higher than control samples.It is thus clear that when workpiece was soft steel, the soaking time that austenitizing is handled was preferably 2h～9h.
Scheme two is to adopt 45 steel as the medium carbon steel sample, is divided into 8 groups and makes an experiment.Wherein, Reserve 1 group as control samples; Remaining 7 groups TP and operation steps are identical with such scheme one; Only be all difference on the time that austenitizing is handled, promptly be incubated 40min, 1.5h, 2h, 3h, 4h, 5h, 7h respectively, the Hardness results of respectively organizing sample at last is as shown in Figure 3.Can be known that by Fig. 3 along with the prolongation in austenitizing treatment time, the hardness of 45 steel sample workpiece increases gradually, reach peak value during insulation 1.5h, hardness begins to reduce immediately, and when insulation 2h, hardness value still is higher than control samples.It is thus clear that when workpiece was medium carbon steel, the soaking time that austenitizing is handled was preferably 40min～2h.
Scheme three is to adopt the T10 steel as the high carbon steel sample, is divided into 10 groups and makes an experiment.Wherein, Reserve 1 group as control samples; Remaining 9 groups TP and operation steps are identical with such scheme one; Only be all difference on the time that austenitizing is handled, promptly be incubated 40min, 1h, 1.5h, 2h, 3h, 4h, 5h, 7h, 9h respectively, the Hardness results of respectively organizing sample at last is as shown in Figure 4.Can be known that by Fig. 4 along with the prolongation in austenitizing treatment time, the hardness of T10 steel sample workpiece increases gradually, reach peak value during insulation 2h, hardness begins to reduce immediately, and when insulation 4h, hardness value still is higher than control samples.It is thus clear that when workpiece was high carbon steel, the soaking time that austenitizing is handled was preferably 40min～4h.
Scheme four is to adopt Cr12MoV cold-working grinding tool steel as the high-carbon alloy steel sample, is divided into 10 groups and makes an experiment.Wherein, Reserve 1 group as control samples; Remaining 9 groups TP and operation steps are identical with such scheme one; Only all difference on austenitizing is handled promptly are incubated 40min, 1h, 1.5h, 2h, 2.5h, 3h, 4h, 5h, 7h respectively, and the Hardness results of respectively organizing sample at last is as shown in Figure 5.Can be known that by Fig. 5 along with the holding time prolonging that austenitizing is handled, Cr12MoV cold-working grinding tool steel sample workpiece hardness increases gradually, reach peak value during insulation 1h, hardness begins to reduce immediately, and when insulation 2h, hardness value still is higher than control samples.It is thus clear that when workpiece was high-carbon alloy steel, the soaking time that austenitizing is handled was preferably 40min～2h.
Utilize XRD to prove the phase transition process of thermal treatment process of the present invention; Experiment is found: workpiece is after ionitrocarburizing is handled; Form the hardened layer of ε and γ ' composition, change into the bainite layer of forming by γ ' and α-Fe, strengthening layer crystal grain refinement significantly simultaneously after handling through the present invention again.It is thus clear that thermal treatment process of the present invention has had largely strengthening layer hardness and wear resistance and improves through phase transformation strengthening and refined crystalline strengthening.
Compared with prior art, the present invention can obtain following technique effect:
(1) surface hardness of soft steel, medium carbon steel, high carbon steel and the high-carbon alloy steel after the various thermal treatment process technology schemes of the present invention are handled is greatly improved than the ionitrocarburizing workpiece of same material; The 08F steel object surface hardness has improved 400HV; 45 steel object surface hardness have improved 240HV; The T10 steel object surface hardness has improved 356.7HV, and the Cr12MoV steel object surface hardness has improved 272HV.Thereby can effectively save part because of the underproof nitrogenize workpiece of tufftride, save resource, and technology is simple, easily operation.
(2) each technical scheme of the present invention not only applicable to different ferrous materials (as not being only applicable to carbon steel, steel alloy; The workpiece of cast iron plasma carbonitriding); Also, have flexibility and better industrial application prospect widely applicable to various nitriding processes (for example gas nitrocarburizing workpiece or salt bath nitrogen carbon workpiece etc.).
Description of drawings
Fig. 1 is the thermal treatment process figure (1. represent the nitrogen-carbon cocementing process process, 2. represent austenitizing treatment process process, 3. represent isothermal aging treatment process process) of various embodiments of the present invention;
Fig. 2 is the surface microhardness curve of 08F steel after art breading of the present invention;
Fig. 3 is the surface microhardness curves of 45 steel after art breading of the present invention;
Fig. 4 is the surface microhardness curve of T10 steel after art breading of the present invention;
Fig. 5 is the surface microhardness curve of Cr12MoV cold-working grinding tool steel after art breading of the present invention;
Fig. 6 is 45 steel among the embodiment, T10 steel and the wear of work lab diagram of Cr12MoV cold-working grinding tool steel after art breading of the present invention.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing the present invention is further described.
Embodiment 1:
As shown in Figure 1; Utilize the thermal treatment process of raising soft steel workpiece carbonitriding strengthening layer performance of the present invention to handle the 08F steel; This thermal treatment process mainly comprises ionitrocarburizing, 700 ℃ of austenitizings processing and three steps of 225 ℃ of isothermal agings processing, and concrete operations are following:
(1) ionitrocarburizing: 08F steel sample sent in 570 ℃ ± 10 ℃ the ion nitriding furnace and carry out ionitrocarburizing 5h, cool to room temperature then with the furnace;
(2) austenitizing is handled: with NaCl, BaCl
2And CaCl
2Put into pit furnace and be heated to 700 ℃, will the 08F steel sample after ionitrocarburizing is handled insert and carry out austenitizing in 700 ℃ the pit furnace and handle, insulation 5h, the water-cooled of coming out of the stove is also carried out cleaned by ultrasonic vibration;
(3) isothermal aging is handled: will pass through 08F steel sample that austenitizing handles and put into and carry out isothermal aging in 225 ℃ the oil bath furnace and handle, insulation 14h is cooled to room temperature workpiece then, obtains the workpiece after thermal treatment of the present invention.
After above-mentioned steps (1) is accomplished; Choose one section workpiece, at ambient temperature, (trier is a HXD-1000T type Vickers testing machine for the hardness of the 08F steel workpiece of detection behind ionitrocarburizing and thickness of strengthened layer; Experiment load is 4.9N; Time length is 15s, and each numerical value is got 8 TP MVs), the workpiece surface hardness that obtains behind ionitrocarburizing is 268.2HV.According to identical testing installation and condition, detect the hardness and the thickness of strengthened layer of the 08F steel workpiece after art breading of the present invention, obtaining its surface hardness peak value is 660.8HV (referring to Fig. 2).It is thus clear that after art breading of the present invention, the hardness of 08F steel sample has improved about 392.6 HV.
Embodiment 2:
As shown in Figure 1; Utilize the thermal treatment process of raising medium carbon steel workpiece carbonitriding strengthening layer performance of the present invention to handle 45 steel; This thermal treatment process mainly comprises ionitrocarburizing, 700 ℃ of austenitizings processing and three steps of 225 ℃ of isothermal agings processing, and concrete operations are following:
(1) ionitrocarburizing: 45 steel samples are sent in 570 ℃ ± 10 ℃ the ion nitriding furnace and carry out ionitrocarburizing 5h, cool to room temperature then with the furnace;
(2) austenitizing is handled: with NaCl, BaCl
2And CaCl
2Put into pit furnace and be heated to 700 ℃, will 45 steel samples after ionitrocarburizing is handled insert and carry out austenitizing in 700 ℃ the pit furnace and handle, insulation 1.5h, the water-cooled of coming out of the stove is also carried out cleaned by ultrasonic vibration;
(3) isothermal aging is handled: will pass through austenitizing and handle 45 steel samples and put into and carry out isothermal aging in 225 ℃ the oil bath furnace and handle, insulation 14h is cooled to room temperature workpiece then, obtains the workpiece after thermal treatment of the present invention.
After above-mentioned steps (1) is accomplished; Choose one section workpiece, at ambient temperature, (trier is a HXD-1000T type Vickers testing machine for the hardness of 45 steel workpieces of detection behind ionitrocarburizing and thickness of strengthened layer; Experiment load is 4.9N; Time length is 15s, and each numerical value is got 8 TP MVs), the surface hardness that obtains the workpiece behind ionitrocarburizing is 622.4HV.According to identical testing installation and condition, detect the hardness and the thickness of strengthened layer of 45 steel workpieces after art breading of the present invention, obtaining its surface hardness peak value is 858.5HV (referring to Fig. 3).It is thus clear that after art breading of the present invention, the hardness of 08F steel sample has improved about 236.1HV.
Embodiment 3:
As shown in Figure 1; Utilize the thermal treatment process of raising high carbon steel workpiece carbonitriding strengthening layer performance of the present invention to handle the T10 steel; This thermal treatment process mainly comprises ionitrocarburizing, 700 ℃ of austenitizings processing and three steps of 225 ℃ of isothermal agings processing, and concrete operations are following:
(1) ionitrocarburizing: T10 steel sample sent in 570 ℃ ± 10 ℃ the ion nitriding furnace and carry out ionitrocarburizing 5h, cool to room temperature then with the furnace;
(2) austenitizing is handled: with NaCl, BaCl
2And CaCl
2Put into pit furnace and be heated to 700 ℃, will the T10 steel sample after ionitrocarburizing is handled insert and carry out austenitizing in 700 ℃ the pit furnace and handle, insulation 2h, the water-cooled of coming out of the stove is also carried out cleaned by ultrasonic vibration;
(3) isothermal aging is handled: will pass through T10 steel sample that austenitizing handles and put into and carry out isothermal aging in 225 ℃ the oil bath furnace and handle, insulation 14h is cooled to room temperature workpiece then, obtains the workpiece after thermal treatment of the present invention.
After above-mentioned steps (1) is accomplished; Choose one section workpiece, at ambient temperature, (trier is a HXD-1000T type Vickers testing machine for the hardness of the T10 steel workpiece of detection behind ionitrocarburizing and thickness of strengthened layer; Experiment load is 4.9N; Time length is 15s, and each numerical value is got 8 TP MVs), the surface hardness that obtains the T10 workpiece behind ionitrocarburizing is 504.5HV.According to identical testing installation and condition, detect the hardness and the thickness of strengthened layer of the T10 steel workpiece after art breading of the present invention, obtaining its surface hardness peak value is 862.1HV (referring to Fig. 4).It is thus clear that after art breading of the present invention, the hardness of T10 steel sample has improved about 357.6HV.
Embodiment 4:
As shown in Figure 1; Utilize the thermal treatment process of raising high carbon alloy steel workpiece carbonitriding strengthening layer performance of the present invention to handle Cr12MoV cold-working grinding tool steel; This thermal treatment process mainly comprises ionitrocarburizing, 700 ℃ of austenitizings processing and three steps of 225 ℃ of isothermal agings processing, and concrete operations are following:
(1) ionitrocarburizing: Cr12MoV cold-working grinding tool steel sample sent in 570 ℃ ± 10 ℃ the ion nitriding furnace and carry out ionitrocarburizing 5h, cool to room temperature then with the furnace;
(2) austenitizing is handled: with NaCl, BaCl
2And CaCl
2Put into pit furnace and be heated to 700 ℃, will the Cr12MoV cold-working grinding tool steel sample after ionitrocarburizing is handled insert and carry out austenitizing in 700 ℃ the pit furnace and handle, insulation 1h, the water-cooled of coming out of the stove is also carried out cleaned by ultrasonic vibration;
(3) isothermal aging is handled: will pass through austenitizing and handle Cr12MoV cold-working grinding tool steel sample and put into and carry out isothermal aging in 225 ℃ the oil bath furnace and handle, insulation 14h is cooled to room temperature workpiece then, obtains the workpiece after thermal treatment of the present invention.
After above-mentioned steps (1) is accomplished; Choose one section workpiece; At ambient temperature, (trier is a HXD-1000T type Vickers testing machine, and experiment load is 4.9N for the hardness of the Cr12MoV cold-working grinding tool steel workpiece of detection behind ionitrocarburizing and thickness of strengthened layer; Time length is 15s, and each numerical value is got 8 TP MVs.), the surface hardness that obtains the Cr12MoV cold-working grinding tool steel workpiece behind ionitrocarburizing is 760.9HV.According to identical testing installation and condition, detect the hardness and the thickness of strengthened layer of the Cr12MoV cold-working grinding tool steel workpiece after art breading of the present invention, obtaining its surface hardness peak value is 1032.9HV (referring to Fig. 5).It is thus clear that after art breading of the present invention, the hardness of Cr12MoV cold-working grinding tool steel sample has improved about 272HV.
Each workpiece of the foregoing description is carried out wearing test, and (wear testing machine from repacking is adopted in experiment, and the wearing and tearing antithesis adopts the Cr12MoV steel, is processed into the disk of diameter 178mm, disc thickness 20mm.Adopt quench treatment to make the hardness of material reach 65HRC then.Loaded load is 70N during wearing and tearing, and the emery wheel rotating speed is 240 rev/mins, 6000 commentaries on classics (about 3.4km) of wearing and tearing altogether.) because the employing of 08F steel is light sheet, therefore only 45 steel, T10 steel and Cr12MoV steel are carried out wear test.Experimental result is seen Fig. 6.Visible by Fig. 6, after thermal treatment process processing of the present invention, the wear resistance of various workpiece is significantly increased than the wear resistance of the ionitrocarburizing workpiece of same material.
The above only is the preferred embodiments of the present invention, and protection scope of the present invention also not only is confined to the foregoing description, and all technical schemes that belongs under the thinking of the present invention all belong to protection scope of the present invention.Should be pointed out that for those skilled in the art some improvement and retouching not breaking away under the principle of the invention prerequisite all should be regarded as protection scope of the present invention.
Claims (9)
1. thermal treatment process that improves steel workpiece carbonitriding strengthening layer performance is characterized in that this technology may further comprise the steps:
(1) austenitizing is handled: the soft steel workpiece behind carbonitriding is carried out the austenitizing processing, and the treatment time is 0.5h～9h;
(2) isothermal aging is handled: the workpiece after austenitizing is handled is carried out the isothermal aging processing again, accomplish thermal treatment process.
2. the thermal treatment process of raising steel workpiece carbonitriding strengthening layer performance according to claim 1, it is characterized in that: the said treatment time is 2h～9h.
3. thermal treatment process that improves steel workpiece carbonitriding strengthening layer performance is characterized in that this technology may further comprise the steps:
(1) austenitizing is handled: the medium carbon steel workpiece behind carbonitriding is carried out the austenitizing processing, and the treatment time is 0.5h～2.5h;
(2) isothermal aging is handled: will carry out isothermal aging through the workpiece that austenitizing is handled again and handle, and accomplish thermal treatment process.
4. the thermal treatment process of raising steel workpiece carbonitriding strengthening layer performance according to claim 3, it is characterized in that: the said treatment time is 40min～2h.
5. thermal treatment process that improves steel workpiece carbonitriding strengthening layer performance is characterized in that this technology may further comprise the steps:
(1) austenitizing is handled: the high carbon steel workpiece behind carbonitriding is carried out the austenitizing processing, and the treatment time is 0.5h～4h;
(2) isothermal aging is handled: will carry out isothermal aging through the workpiece that austenitizing is handled again and handle, and accomplish thermal treatment process.
6. thermal treatment process that improves steel workpiece carbonitriding strengthening layer performance is characterized in that this technology may further comprise the steps:
(1) austenitizing is handled: the high carbon alloy steel workpiece behind carbonitriding is carried out the austenitizing processing, and the treatment time is 0.5h～2h;
(2) isothermal aging is handled: will carry out isothermal aging through the workpiece that austenitizing is handled again and handle, and accomplish thermal treatment process.
7. according to the thermal treatment process of each described raising steel workpiece carbonitriding strengthening layer performance in the claim 1 to 6; It is characterized in that; Said austenitizing technological processes is: will the said workpiece behind carbonitriding put into 700 ℃ ± 10 ℃ fused salt or vacuum and carry out austenitizing and handle; After the insulation, the water-cooled of coming out of the stove.
8. the thermal treatment process of raising steel workpiece carbonitriding strengthening layer performance according to claim 7, it is characterized in that: said fused salt is NaCl, BaCl
2And CaCl
2Mixing salt.
9. according to the thermal treatment process of each described raising steel workpiece carbonitriding strengthening layer performance in the claim 1 to 6; It is characterized in that; Said isothermal aging technological processes is: will put into 225 ℃ ± 5 ℃ oil bath furnace through the workpiece that austenitizing is handled and carry out isothermal aging and handle; Insulation 6h～14h goes out the oil bath furnace water-cooled with said workpiece again, accomplishes and handles.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103556108A (en) * | 2013-11-07 | 2014-02-05 | 山东新金发汽车零部件有限公司 | Method for improving hardness of low-carbon steel nitride product |
| CN103589988A (en) * | 2013-11-01 | 2014-02-19 | 通富热处理(昆山)有限公司 | Nitridation or soft nitridation equipment for automobile parts |
| CN104651858A (en) * | 2015-03-09 | 2015-05-27 | 湖南大学 | Composite heat treatment process for improving surface compactness of nitro-carburizing strengthened layer |
| JP7178832B2 (en) | 2018-08-31 | 2022-11-28 | 日本パーカライジング株式会社 | Method for manufacturing surface hardening material |
-
2011
- 2011-01-25 CN CN201110026979.6A patent/CN102605315B/en active Active
Non-Patent Citations (1)
| Title |
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| 陈汪林 等: "固溶处理对08F钢离子氮碳共渗强化层显微结构演化规律的影响", 《第七届中国功能材料及其应用学术会议论文集(第7分册)》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589988A (en) * | 2013-11-01 | 2014-02-19 | 通富热处理(昆山)有限公司 | Nitridation or soft nitridation equipment for automobile parts |
| CN103589988B (en) * | 2013-11-01 | 2015-12-09 | 通富热处理(昆山)有限公司 | The nitrogenize of auto-parts or tufftride equipment |
| CN103556108A (en) * | 2013-11-07 | 2014-02-05 | 山东新金发汽车零部件有限公司 | Method for improving hardness of low-carbon steel nitride product |
| CN104651858A (en) * | 2015-03-09 | 2015-05-27 | 湖南大学 | Composite heat treatment process for improving surface compactness of nitro-carburizing strengthened layer |
| CN104651858B (en) * | 2015-03-09 | 2017-01-11 | 湖南大学 | Composite heat treatment process for improving surface compactness of nitro-carburizing strengthened layer |
| JP7178832B2 (en) | 2018-08-31 | 2022-11-28 | 日本パーカライジング株式会社 | Method for manufacturing surface hardening material |
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