CN103526007A - Heat treatment process of medium-thickness non-quenched tempered plastic mold steel plate - Google Patents
Heat treatment process of medium-thickness non-quenched tempered plastic mold steel plate Download PDFInfo
- Publication number
- CN103526007A CN103526007A CN201310485736.8A CN201310485736A CN103526007A CN 103526007 A CN103526007 A CN 103526007A CN 201310485736 A CN201310485736 A CN 201310485736A CN 103526007 A CN103526007 A CN 103526007A
- Authority
- CN
- China
- Prior art keywords
- temperature
- steel plate
- furnace
- roller hearth
- treatment process
- 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.)
- Granted
Links
Images
Abstract
The invention relates to a heat treatment process and in particular relates to a heat treatment process of a medium-thickness non-quenched tempered plastic mold steel plate. The heat treatment process is characterized by regulating the surface hardness and a section effect in a direction of the thickness of the steel plate through control of the furnace temperature of a non-oxidation roller hearth type furnace and the tapping temperature of mould steel. The heat treatment process comprises the following steps: (1) preheating a non-oxidation roller hearth type furnace, setting the furnace temperature at 560-620 DEG C, pre-balancing for 30-55 minutes and controlling the oxygen content in the furnace to be less than or equal to 1000ppm in the whole process; (2) heating the steel plate, controlling the oxygen content in the furnace to be less than or equal to 1000ppm in the whole process, feeding the steel plate into the roller hearth type furnace, continuously detecting the surface temperature of the steel plate, enabling the surface temperature of the steel plate to be up to the set furnace temperature of the roller hearth type furnace when the steel plate is transmitted to a position approximate to a discharging furnace door of the roller hearth type furnace, insulating for 120-150 minutes after reaching the temperature, and discharging. The heat treatment process is simple in step; the production period is shortened; the processed steel plate is even in hardness and can meet the provisions meeting the quality standards.
Description
Technical field
The present invention relates to a kind of thermal treatment process, is specifically a kind of thermal treatment process of intermediate gauge non-quenching and tempering plastic mold steel plate.
Background technology
Non-modified pre-hardening type die steel be steel mill for the convenience of the user, heat treatment step is completed in steel mill in advance, by normalizing treatment and temper, obtain medium-hard thinning microstructure (hardness is generally not more than 40HRC), then carry out die sinking processing, the thermal treatment during without die forming.Both met the requirement of die part use properties, and do not affected again a class steel alloy of machinability, and be particularly suitable for die cavity complexity, precision is high, and size is large, the die part that thermal treatment process is poor; Because related die steel belongs to high strength alloy steel, surface hardness is stronger to the susceptibility of temperature, make the section hardness drop of steel plate of different thickness larger, plate property is unstable, cause thermal treatment process to solidify, impact has a strong impact on the quality of product when producing, it is large that cost increases, steel plate is saved workload.
Retrieval is found, publication number is that the Chinese patent of CN103074477A discloses " a kind of heat treating method of special thick non-hardening state steel plate for ocean engineering ", the technical scheme that this application is announced mainly comprises double normalizing+tempering process, it is very accurate that this technical scheme requires temperature to control, and step is more, be not suitable for stable mass production.
Summary of the invention
Technical problem to be solved by this invention is, in order to realize the stable batch of such plastic die steel, produces, and need to current thermal treatment process, be optimized and experimental study, and a kind of thermal treatment process of applicable intermediate gauge non-quenching and tempering plastic mold steel plate is provided.
The present invention solves the technical scheme of above technical problem:
A kind of thermal treatment process of intermediate gauge non-quenching and tempering plastic mold steel plate, mainly to regulate and control the Section Effect on surface of steel plate hardness and thickness direction by controlling non-oxidation roller hearth furnace furnace temperature and this die steel tapping temperature, comprising the steps: 1) non-oxidation roller hearth furnace preheats, the furnace temperature of non-oxidation roller hearth furnace is set between 560-620 ℃, in stove, pass into nitrogen simultaneously, pre-equilibration 30-55min, make the temperature difference≤5 ℃ between the interior measured temperature of described non-oxidation roller hearth furnace and design temperature, the omnidistance interior oxygen level≤1000ppm of stove that controls; 2) steel plate heating, the omnidistance interior oxygen level≤1000ppm of stove that controls, steel plate is sent in roller hearth furnace and continue to detect surface of steel plate temperature, when steel plate transmission approaches the discharging door of roller hearth furnace, at the bottom of the surface temperature of steel plate reaches roll-type, stove is set furnace temperature, after temperature, be incubated 120-150min, come out of the stove.
The technical scheme that the present invention further limits is:
Further, on the furnace roof of non-oxidation roller hearth furnace inner chamber and sidewall, be respectively equipped with temperature detection district, described in each, temperature detection district is equipped with at least one thermopair, thermopair feeds back to burning watch-keeping cubicle by the temperature information collecting, described burning watch-keeping cubicle, by automatic or manual regulation burner, guarantees that the temperature in each temperature detection district in stove all reaches design temperature in stove; The sidewall of described non-oxidation roller hearth furnace inner chamber is provided with at least one micro-oxygen analyzer; Infrared radiation pyrometer in the discharge end of roller hearth furnace is provided with for detection of the stove of surface of steel plate temperature.
Further, be respectively equipped with 12Ge temperature detection district on the furnace roof of non-oxidation roller hearth furnace inner chamber and sidewall, each temperature detection district is equipped with two thermopairs.
Further, the thickness of steel plate is 20-135mm.
Beneficial effect of the present invention is: processing and optimization that thermal treatment process provided by the invention is carried out for the characteristic of intermediate gauge non-quenching and tempering plastic mold steel plate specially, this technique is through a large amount of experimental data checkings, shortened the required time of thermal treatment having simplified whole thermal treatment production process simultaneously, this technique is than common process save energy more than 30%, the steel plate hardness of processing is even, and the regulation that all can reach quality standards.
Accompanying drawing explanation
Fig. 1 is in stove during 540 ℃ of Temperature Settings, observed temperature and surface of steel plate temperature temporal evolution graphic representation in stove.
Fig. 2 is in stove during 620 ℃ of Temperature Settings, observed temperature and surface of steel plate temperature temporal evolution graphic representation in stove.
Fig. 3 is in stove during 910 ℃ of Temperature Settings, observed temperature and surface of steel plate temperature temporal evolution graphic representation in stove.
Embodiment
embodiment 1
Adopt the die steel NSM30 that thickness range is 20-120mm to heat-treat rear hardness test, furnace temperature is set Heating temperature 560-620 ℃, and pre-equilibration 30-55min is incubated 120-150min after steel plate is heated to setting Heating temperature, comes out of the stove and carries out hardness detection;
Table 1 is every test and the detect parameters of the present embodiment;
As can be seen from the table, the heat treatment hardness value of all samples is between 287-330HBW, and the quality standard specified requirement hardness that standard No. is JX/NG2084-NSM30 is at 265-340HBW, therefore all up to standard.
Embodiment 2
Adopt the die steel P20 that thickness range is 23-135mm to heat-treat rear hardness test, furnace temperature is set 560 ℃ of Heating temperatures, and pre-equilibration 30min is incubated 150min after steel plate is heated to setting Heating temperature, comes out of the stove and carries out hardness detection;
Table 2 is every test and the detect parameters of the present embodiment;
As can be seen from the table, the heat treatment hardness value of all samples is between 330-339HBW, and the quality standard specified requirement hardness that standard No. is JX/NG2261-P20 is at 280-340HBW, therefore all up to standard.
Embodiment 3
Adopt the die steel 718 that thickness range is 53-125mm to heat-treat rear hardness test, furnace temperature is set 560 ℃ of Heating temperatures, and pre-equilibration 30min is incubated 150min after steel plate is heated to setting Heating temperature, comes out of the stove and carries out hardness detection;
Table 3 is every test and the detect parameters of the present embodiment;
As can be seen from the table, the heat treatment hardness value of all samples is between 300-317HBW, and the quality standard specified requirement hardness that standard No. is JX/NG2260-718 is at 290-330HBW, therefore all up to standard.
Embodiment 4
While monitoring respectively 540 ℃ of roller hearth furnace design temperatures, 620 ℃ and 910 ℃, furnace temperature and the time dependent numerical value of surface of steel plate temperature, and curve plotting figure;
As shown in Figure 1, when furnace temperature is set as 540 ℃, furnace gas temperature reaches design temperature when 40min, prolongation along with heat-up time, when 110min, surface of steel plate reaches 540 ℃, now furnace gas medial temperature and surface of steel plate temperature approach be in 20 ℃, then be incubated 100min, makes furnace gas temperature and surface of steel plate temperature head minimum;
As shown in Figure 2, when furnace temperature is set as 620 ℃, furnace gas temperature reaches design temperature when 30min, prolongation along with heat-up time, when 55min, surface of steel plate reaches 620 ℃, now furnace gas medial temperature and surface of steel plate temperature approach are about 4 ℃, then are incubated 60min, make furnace gas temperature and surface of steel plate temperature head minimum;
As shown in Figure 3, when 910 ℃ of normalizing are processed, furnace gas temperature reaches design temperature when 55min, and along with the prolongation of heat-up time, when 70min, surface of steel plate reaches 910 ℃, and now furnace gas medial temperature and surface of steel plate temperature approach are about 30 ℃.Be incubated again 30min, make furnace gas temperature and surface of steel plate temperature head minimum.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (4)
1. the thermal treatment process of an intermediate gauge non-quenching and tempering plastic mold steel plate, mainly to regulate and control the Section Effect on surface of steel plate hardness and thickness direction by controlling non-oxidation roller hearth furnace furnace temperature and this die steel tapping temperature, it is characterized in that: comprise the steps: 1) non-oxidation roller hearth furnace preheats, the furnace temperature of non-oxidation roller hearth furnace is set between 560-620 ℃, in stove, pass into nitrogen simultaneously, pre-equilibration 30-55min, make the temperature difference≤5 ℃ between the interior measured temperature of described non-oxidation roller hearth furnace and design temperature, the omnidistance interior oxygen level≤1000ppm of stove that controls, 2) steel plate heating, the omnidistance interior oxygen level≤1000ppm of stove that controls, steel plate is sent in roller hearth furnace and continue to detect surface of steel plate temperature, when steel plate transmission approaches the discharging door of roller hearth furnace, at the bottom of the surface temperature of steel plate reaches roll-type, stove is set furnace temperature, after temperature, be incubated 120-150min, come out of the stove.
2. the thermal treatment process of intermediate gauge non-quenching and tempering plastic mold steel plate according to claim 1, it is characterized in that: on the furnace roof of described non-oxidation roller hearth furnace inner chamber and sidewall, be respectively equipped with temperature detection district, described in each, temperature detection district is equipped with at least one thermopair, thermopair feeds back to burning watch-keeping cubicle by the temperature information collecting, described burning watch-keeping cubicle, by automatic or manual regulation burner, guarantees that the temperature in each temperature detection district in stove all reaches design temperature in stove; The sidewall of described non-oxidation roller hearth furnace inner chamber is provided with at least one micro-oxygen analyzer; Infrared radiation pyrometer in the discharge end of roller hearth furnace is provided with for detection of the stove of surface of steel plate temperature.
3. the thermal treatment process of intermediate gauge non-quenching and tempering plastic mold steel plate according to claim 2, it is characterized in that: on the furnace roof of described non-oxidation roller hearth furnace inner chamber and sidewall, be respectively equipped with 12Ge temperature detection district, described in each, temperature detection district is equipped with two thermopairs.
4. the thermal treatment process of intermediate gauge non-quenching and tempering plastic mold steel plate according to claim 1, is characterized in that: the thickness of described steel plate is 20-135mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310485736.8A CN103526007B (en) | 2013-10-16 | 2013-10-16 | Heat treatment process of medium-thickness non-quenched tempered plastic mold steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310485736.8A CN103526007B (en) | 2013-10-16 | 2013-10-16 | Heat treatment process of medium-thickness non-quenched tempered plastic mold steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103526007A true CN103526007A (en) | 2014-01-22 |
| CN103526007B CN103526007B (en) | 2015-05-27 |
Family
ID=49928352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310485736.8A Active CN103526007B (en) | 2013-10-16 | 2013-10-16 | Heat treatment process of medium-thickness non-quenched tempered plastic mold steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103526007B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105132638A (en) * | 2015-10-15 | 2015-12-09 | 白城中一精锻股份有限公司 | Method and device for eliminating internal stress of non-quenched and tempered steel automobile engine connecting rod forge piece |
| CN113390533A (en) * | 2021-06-15 | 2021-09-14 | 中国兵器工业第五九研究所 | Method for detecting surface temperature of workpiece in heat treatment process |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892366A (en) * | 2010-07-22 | 2010-11-24 | 南京钢铁股份有限公司 | Low oxygen content and low nitrogen consumption control system and method for radiant tube-heated non-oxidation roller hearth furnace |
| CN102115812A (en) * | 2011-03-24 | 2011-07-06 | 南京钢铁股份有限公司 | Prompt tempering heat treatment method for Q690D steel |
| CN102140569A (en) * | 2011-03-24 | 2011-08-03 | 南京钢铁股份有限公司 | Quick normalizing heat treatment method for Q345R steel |
| CN102732665A (en) * | 2012-03-29 | 2012-10-17 | 鞍钢股份有限公司 | Method for adding nitrogen in molten steel in last phase of steel making |
| CN102756251A (en) * | 2012-05-18 | 2012-10-31 | 山东大王金泰集团有限公司 | High-strength steel plate hot-stamping molding production line and production process thereof |
| CN103014251A (en) * | 2012-11-27 | 2013-04-03 | 大连经济技术开发区圣洁真空技术开发有限公司 | Heat treatment process of anticorrosion steel plate |
-
2013
- 2013-10-16 CN CN201310485736.8A patent/CN103526007B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892366A (en) * | 2010-07-22 | 2010-11-24 | 南京钢铁股份有限公司 | Low oxygen content and low nitrogen consumption control system and method for radiant tube-heated non-oxidation roller hearth furnace |
| CN102115812A (en) * | 2011-03-24 | 2011-07-06 | 南京钢铁股份有限公司 | Prompt tempering heat treatment method for Q690D steel |
| CN102140569A (en) * | 2011-03-24 | 2011-08-03 | 南京钢铁股份有限公司 | Quick normalizing heat treatment method for Q345R steel |
| CN102732665A (en) * | 2012-03-29 | 2012-10-17 | 鞍钢股份有限公司 | Method for adding nitrogen in molten steel in last phase of steel making |
| CN102756251A (en) * | 2012-05-18 | 2012-10-31 | 山东大王金泰集团有限公司 | High-strength steel plate hot-stamping molding production line and production process thereof |
| CN103014251A (en) * | 2012-11-27 | 2013-04-03 | 大连经济技术开发区圣洁真空技术开发有限公司 | Heat treatment process of anticorrosion steel plate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105132638A (en) * | 2015-10-15 | 2015-12-09 | 白城中一精锻股份有限公司 | Method and device for eliminating internal stress of non-quenched and tempered steel automobile engine connecting rod forge piece |
| CN113390533A (en) * | 2021-06-15 | 2021-09-14 | 中国兵器工业第五九研究所 | Method for detecting surface temperature of workpiece in heat treatment process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103526007B (en) | 2015-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103170704B (en) | A kind of special thick middle, high-carbon and the flame cutting technique of steel alloy steel plate | |
| WO2011081394A3 (en) | Hot press forming process of plated steel and hot press formed articles using the same | |
| CN102851627A (en) | Novel titanium alloy partitioned beta heat treatment process | |
| CN105734231A (en) | Heat treatment process for H13 steel | |
| CN101914669B (en) | Cold induction quenching process for single tooth back of large-modulus gear ring | |
| CN103831380A (en) | Die forging forming technology for GH4169 alloy forge piece | |
| CN103526007B (en) | Heat treatment process of medium-thickness non-quenched tempered plastic mold steel plate | |
| CN102605159B (en) | Waste heat temperature control quenching process method for front axle of large-scale vehicle | |
| CN105734249A (en) | Method for refining grain size of large 1Cr11Ni2W2MoV shaft forge pieces | |
| CN101367605B (en) | Tempering processing method for 3.2mm tempered glass | |
| CN105671252A (en) | One-time forging and pressing molding waste heat hardening and tempering technology for automobile front axle | |
| CN101524813A (en) | Waste heat hardening and tempering process of motorcycle crank forged piece | |
| CN101367606B (en) | Tempering processing method for 4.0mm tempered glass | |
| CN104032115A (en) | Thermal treatment method for reducing secondary gear ring nitrogenized deformation | |
| CN104801563A (en) | Preparation method of medium carbon non-quenched and tempered steel for crankshafts | |
| CN104313258B (en) | A kind of spanner quenching method | |
| CN105567948A (en) | Spheroidizing annealing temperature control process of cold-rolled steel coil | |
| CN104626725A (en) | Hot-pressing moulding technology of composite steel plate seal head | |
| CN103131837A (en) | Sheet milling cutter air cooling micro-distortion quenching process | |
| CN102676939B (en) | Thermal treatment process for 18Cr17Ni2 modified stainless steel material | |
| CN103060538B (en) | Setting method in sections of high alloy steel vacuum heat treatment high-temperature region parameters | |
| CN107937827A (en) | Improve the production method of steel polishing performance | |
| CN103849736A (en) | Heat treatment process of high-chromium cast iron | |
| CN103276173B (en) | Process method for rolling plate from 4Cr13 medium plate corrosion resistance mold steel | |
| CN103981348B (en) | A kind of 16Co14Ni10Cr2Mo steel heavy parts method for controlling heat treatment deformation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |