CN102719758A - Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof - Google Patents

Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof Download PDF

Info

Publication number
CN102719758A
CN102719758A CN2012102111796A CN201210211179A CN102719758A CN 102719758 A CN102719758 A CN 102719758A CN 2012102111796 A CN2012102111796 A CN 2012102111796A CN 201210211179 A CN201210211179 A CN 201210211179A CN 102719758 A CN102719758 A CN 102719758A
Authority
CN
China
Prior art keywords
die steel
steel
temperature
hot working
oxidation
Prior art date
Application number
CN2012102111796A
Other languages
Chinese (zh)
Inventor
殷凤仕
姜学波
薛冰
周丽
徐振
Original Assignee
山东理工大学
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 山东理工大学 filed Critical 山东理工大学
Priority to CN2012102111796A priority Critical patent/CN102719758A/en
Publication of CN102719758A publication Critical patent/CN102719758A/en

Links

Abstract

The invention discloses anti-oxidation and anti-thermal fatigue hot working die steel which is characterized by including, by mass percent, 0.02 to 0.15 of carbon, 0 to 1.2 of silicon, 0 to 0.6 of manganese, 0 to 0.030 of phosphorus, 0 to 0.015 of sulfur, 8.0 to 12.0 of chromium, 0.2 to 0.6 of molybdenum, 1.5 to 2.3 of tungsten, 0.8 to 1.2 of vanadium, 0.01 to 0.1 of nitrogen, 0.05 to 0.20 of niobium, 1.0 to 4.0 of cobalt, 0.005 to 0.015 of boron, and the balance iron and inevitable impurities. The manufacturing method includes subjecting raw material compositions forming elements to smelting and casting to obtain die steel ingots; forging or rolling the die steel ingots; annealing the forged or rolled die steel ingots; and subjecting the annealed die steel ingots to final thermal treatment. The manufacturing method is characterized in that the annealing process includes that air cooling is kept at a temperature of 800 DEG C to 850 DEG C for 1-2h; and the final thermal treatment process includes that oil cooling is kept at a temperature of 1030 DEG C to 1150 DEG C for 0.5-2h, and air cooling is kept at a temperature of 600 DEG C to 700 DEG C for 1-2h. Compared with the prior art, the anti-oxidation and anti-thermal fatigue hot working die steel and the manufacturing method thereof have the advantages that the hot working die steel manufactured at a temperature above 600 DEG C has a high high-temperature strength and a stagnation temperature compared with the existing hot working die steel such H13 steel and 3Cr2W8V steel, accordingly, high anti-oxidation and anti-thermal fatigue performances are provided, and anticorrosion and anti-oxidation performances are improved greatly compared with the existing hot working die steel because many chromium elements are contained.

Description

Anti-oxidant thermal fatigue resistance hot-work die steel and method of manufacture thereof
Technical field
The present invention relates to a kind of steel alloy and method of manufacture thereof, especially relate to a kind of anti-oxidant thermal fatigue resistance hot-work die steel and method of manufacture thereof, belong to the metallic substance technical field.
Background technology
Hot-work die steel is worked under the high temperature complex environment; Bear very big surging force, die cavity is with after hot metal contacts, and local temperature reaches 500-800 ℃; Also stand heating and cooling repeatedly, requiring to have high hot strength and anti-oxidant, thermal fatigue resistance.At present, hot-work die steel material commonly used has 3Cr2W8V and 4Cr5MoSiV (H13 steel) etc.When making hot-forging die, transfer mold and hot extruding die with these die steel materials; Because hot strength is low; Anti-oxidant and thermal fatigue resistance are poor, in use produce oxidation and distortion, heat fatigue cracking (be full of cracks) occurs at the internal surface of die cavity; Not only reduce the work-ing life of mould, but also reduce the surface quality of profiled member.
Summary of the invention
The purpose of this invention is to provide a kind of anti-oxidant thermal fatigue resistance hot-work die steel and method of manufacture thereof that can overcome above-mentioned defective, excellent working performance, its technical scheme is:
A kind of anti-oxidant thermal fatigue resistance hot-work die steel is characterized in that its chemical constitution is by percentage to the quality: carbon 0.02 ~ 0.15, silicon 0 ~ 1.2, manganese 0 ~ 0.6; Phosphorus 0 ~ 0.030, sulphur 0 ~ 0.015, chromium 8.0 ~ 12.0, molybdenum 0.2 ~ 0.6; Tungsten 1.5 ~ 2.3, vanadium 0.8 ~ 1.2, nitrogen 0.01 ~ 0.15, niobium 0.05 ~ 0.20; Cobalt 1.0 ~ 4.0, boron 0.005 ~ 0.015, surplus is iron and unavoidable impurities.
A kind of method of manufacture of anti-oxidant thermal fatigue resistance hot-work die steel as claimed in claim 1 may further comprise the steps: the feedstock composition that 1) will constitute element makes the die steel steel ingot through smelting and pouring; 2) forging or rolling; 3) annealing; 4) final thermal treatment is characterized in that annealing process is: 800-850 ℃ keeps 1-2h, air cooling; Final thermal treatment process is: 1030-1150 ℃ keeps the 0.5-2h oil cooling, and 600-700 ℃ keeps the 1-2h air cooling.
The principle of foregoing invention technical scheme is: the high-temperature oxidation resistance that improves steel through the mass percent that improves chromium to 8-12%; The adjustment carbon content forms the carbonitride dispersion-strengthened with interpolation nitrogen element and guarantees hot strength mutually, and improves the critical temperature A of steel through the proportioning of optimizing alloying element C1After final thermal treatment, the tissue of steel is uniform-distribution with stable high density carbon nitride diffusion phase, thereby is had high hot strength by the lath-shaped tempered martensite on it.High hot strength and high critical temperature make steel of the present invention have good thermal fatigue resistance.
The selection reason that respectively constitutes the constituent content scope in the face of steel of the present invention down further is explained as follows:
Carbon: reduce critical temperature A C1, promote M 23C 6(M refers to metallic elements such as Cr, Fe) type carbide is separated out, and suppresses carbonitride and separates out with the disperse form, is unfavorable for the raising of hot strength and thermal fatigue resistance.Therefore, in the steel of the present invention, the mass percent of carbon is controlled between 0.02 ~ 0.15%;
Nitrogen: combine to form MX (M refers to metallic elements such as V, Nb, and X refers to C and N) type carbonitride strengthening phase with carbon, niobium, v element.Nitrogen content is too high, is easy to form thick carbonitride phase, is unfavorable for improving hot strength, crosses low enough carbonitride strengthening phases that is not enough to again form.Therefore, nitrogen in steel of the present invention mass percent be controlled at 0.01 ~ 0.15%.
Chromium: improve solidity to corrosion and oxidation-resistance, but too high chromium content forms a large amount of δ-ferritics can cause final thermal treatment heating the time, is unfavorable for the raising of hot strength.Therefore, the mass percent of chromium is controlled between 8 ~ 12% in the steel of the present invention.
Cobalt: austenite former, work to suppress δ-ferritic formation, but do not reduce the critical temperature of steel.But because of costing an arm and a leg of cobalt, few as far as possible using.Therefore, the mass percent of cobalt is controlled between 1 ~ 4% in the steel of the present invention.
Molybdenum and tungsten: the solution strengthening element, improve the hot strength of steel, improve the hardening capacity and the effect that prevents temper brittleness of steel simultaneously in addition.But too high levels can promote δ-ferritic formation.Therefore, the mass percent of molybdenum and tungsten is controlled at respectively between 0.2 ~ 0.6% and 1.5 ~ 2.3% in the steel of the present invention.
Vanadium and niobium: be MX type carbonitride strengthening phase forming element.Content is low excessively, is not enough to form enough MX type carbonitride strengthening phases, and too high levels can form thick carbonitride mutually again easily in melting and process of setting, in final heat treated heat-processed, be difficult to dissolve in austenite.Heat fatigue cracking is easily at the residual thick carbonitride and the forming core at the interface of matrix, thus the thermal fatigue resistance of reduction steel.Therefore, in the steel of the present invention, vanadium and niobium mass percent are controlled at respectively between 0.8 ~ 1.2% and 0.05 ~ 0.20%.
Silicon, manganese, p and s: as impurity element, its quality percentage composition is controlled at Si≤1.2% respectively, Mn :≤0.6%, and P :≤0.030%, S :≤0.015%.
The purpose of the anneal in the method for manufacture of hot-work die steel of the present invention is in order to reduce hardness, to be convenient to the cut in the die manufacture, the die steel after the forging through 800-850 ℃ keep 1h after air cooling annealing, hardness is between 20-35HRC.Final heat treated purpose is be to obtain the lath-shaped tempered martensite, makes in the tissue of steel to contain equally distributed high density carbon nitride diffusion phase, thereby obtains high hot strength and thermal fatigue resistance.
The present invention compared with prior art; Its advantage is: at high temperature more than 600 ℃ than existing hot-work die steel; Like H13 steel and 3Cr2W8V steel, have high hot strength and high critical temperature, thereby have high thermal fatigue resistance; Owing to contain more chromium element, corrosion-resistant and antioxidant property also improves than existing hot-work die steel greatly simultaneously.
Description of drawings
Fig. 1 is that steel embodiment 1 of the present invention and H13 and 3Cr2W8V steel high-temperature yield strength after final thermal treatment contrast with the relation curve between the test temperature.
Embodiment
Table 1 has been listed the chemical ingredients of the 22 kind hot-work die steels of composition in specialized range of the present invention.After melting, forging processing, make φ 16mm hot-work die steel rod iron, through 800-850 ℃ of maintenance 1h, after the air cooling anneal, heat-treat by final heat treating method of the present invention then, heat treatment process parameter is seen table 2.Rod iron after final thermal treatment is processed into the standard tensile sample in the instantaneous stretching test of carrying out on the electronic universal tester under the differing temps, and test result is listed in table 2.Adopt the critical temperature A of DTA technology in addition to steel of the present invention C1Measure, the result also lists in the table 2.In order to contrast, the high temperature instantaneous stretching performance and the critical temperature data of H13 steel and 3Cr2W8V steel also are listed in the table 2.Fig. 1 is that embodiment 1 and H13 steel and 3Cr2W8V steel high-temperature yield strength after final thermal treatment contrast with the relation curve between the test temperature.The data of H13 steel are taken from document [Zhu Zongyuan, China's hot-work die steel performance data collection (continuous XI), mechanical engineering material, calendar year 2001; The 25th the 12nd phase of volume, 36-40 page or leaf], the data of 3Cr2W8V steel are taken from document [Zhu Zongyuan, China's hot-work die steel performance data collection (continuous VII), mechanical engineering material, calendar year 2001; The 25th the 8th phase of volume, the 38-42 page or leaf].Data from Fig. 1 and table 2 can be found out, hot strength and the critical temperature A of hot-work die steel of the present invention more than 600 ℃ C1All, therefore has high thermal fatigue resistance apparently higher than existing hot-work die steel.
Annotate: the thermal treatment process of H13 steel B sample state in the table 2: quench: 1050 ℃ ± 10 ℃ of Heating temperatures, soaking time are pressed 20-25s/mm and are calculated, oil cooling; Tempering for the first time: 610 ℃ * 2h; Tempering for the second time: 620 ℃ * 2h.The thermal treatment process of 3Cr2W8V steel B sample state: quench: 1130 ℃ ± 10 ℃ of Heating temperatures, soaking time are pressed 20-25s/mm and are calculated, oil cooling; Tempering for the first time: 650 ℃ * 2h; Tempering for the second time: 655 ℃ * 2h.
The chemical ingredients of table 1 steel of the present invention (wt.%)
Instantaneous stretching performance and the critical temperature A of table 2 steel of the present invention under differing temps C1

Claims (2)

1. an anti-oxidant thermal fatigue resistance hot-work die steel is characterized in that its chemical constitution is by percentage to the quality: carbon 0.02 ~ 0.15, silicon 0 ~ 1.2, manganese 0 ~ 0.6; Phosphorus 0 ~ 0.030, sulphur 0 ~ 0.015, chromium 8.0 ~ 12.0, molybdenum 0.2 ~ 0.6; Tungsten 1.5 ~ 2.3, vanadium 0.8 ~ 1.2, nitrogen 0.01 ~ 0.15, niobium 0.05 ~ 0.20; Cobalt 1.0 ~ 4.0, boron 0.005 ~ 0.015, surplus is iron and unavoidable impurities.
2. the method for manufacture of an anti-oxidant thermal fatigue resistance hot-work die steel as claimed in claim 1, may further comprise the steps: the feedstock composition that 1) will constitute element makes the die steel steel ingot through smelting and pouring; 2) forging or rolling; 3) annealing; 4) final thermal treatment is characterized in that annealing process is: 800-850 ℃ keeps 1-2h, air cooling; Final thermal treatment process is: 1030-1150 ℃ keeps the 0.5-2h oil cooling, and 600-700 ℃ keeps the 1-2h air cooling.
CN2012102111796A 2012-06-25 2012-06-25 Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof CN102719758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012102111796A CN102719758A (en) 2012-06-25 2012-06-25 Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012102111796A CN102719758A (en) 2012-06-25 2012-06-25 Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof

Publications (1)

Publication Number Publication Date
CN102719758A true CN102719758A (en) 2012-10-10

Family

ID=46945621

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012102111796A CN102719758A (en) 2012-06-25 2012-06-25 Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof

Country Status (1)

Country Link
CN (1) CN102719758A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105779898A (en) * 2014-12-23 2016-07-20 鞍钢股份有限公司 Cold-work die steel plate and manufacturing method thereof
CN108676990A (en) * 2018-05-18 2018-10-19 西京学院 A kind of heat treatment process of 3Cr2W8V molds
CN109735777A (en) * 2019-03-06 2019-05-10 北京科技大学 A kind of anti-oxidant hot die steel and preparation method thereof

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1316539A (en) * 2001-03-23 2001-10-10 清华大学 Anticorrosion refractory high-Co rare-earth alloy
JP2002327246A (en) * 2001-05-01 2002-11-15 Japan Steel Works Ltd:The Hot work tool steel superior in erosion resistance and high temperature strength, and member made thereof for high temperature use
CN101294259A (en) * 2007-04-23 2008-10-29 大同特殊钢株式会社 Hot die steel for die-casting
CN101368247A (en) * 2008-09-16 2009-02-18 周向儒 Novel chromium system hot die steel and thermal treatment process thereof
CN101717892A (en) * 2009-12-14 2010-06-02 浙江正达模具有限公司 Hot die steel and tempering process thereof
CN101880829A (en) * 2010-07-09 2010-11-10 中国第一汽车集团公司 Novel magnesium alloy hot die steel
EP2270245A1 (en) * 2009-06-16 2011-01-05 Daido Tokushuko Kabushiki Kaisha Hot work tool steel and steel product using the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1316539A (en) * 2001-03-23 2001-10-10 清华大学 Anticorrosion refractory high-Co rare-earth alloy
JP2002327246A (en) * 2001-05-01 2002-11-15 Japan Steel Works Ltd:The Hot work tool steel superior in erosion resistance and high temperature strength, and member made thereof for high temperature use
CN101294259A (en) * 2007-04-23 2008-10-29 大同特殊钢株式会社 Hot die steel for die-casting
CN101368247A (en) * 2008-09-16 2009-02-18 周向儒 Novel chromium system hot die steel and thermal treatment process thereof
EP2270245A1 (en) * 2009-06-16 2011-01-05 Daido Tokushuko Kabushiki Kaisha Hot work tool steel and steel product using the same
CN101717892A (en) * 2009-12-14 2010-06-02 浙江正达模具有限公司 Hot die steel and tempering process thereof
CN101880829A (en) * 2010-07-09 2010-11-10 中国第一汽车集团公司 Novel magnesium alloy hot die steel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105779898A (en) * 2014-12-23 2016-07-20 鞍钢股份有限公司 Cold-work die steel plate and manufacturing method thereof
CN105779898B (en) * 2014-12-23 2017-10-27 鞍钢股份有限公司 A kind of cold work die steel plate and its manufacture method
CN108676990A (en) * 2018-05-18 2018-10-19 西京学院 A kind of heat treatment process of 3Cr2W8V molds
CN109735777A (en) * 2019-03-06 2019-05-10 北京科技大学 A kind of anti-oxidant hot die steel and preparation method thereof
CN109735777B (en) * 2019-03-06 2020-10-13 北京科技大学 Anti-oxidation hot-work die steel and preparation method thereof

Similar Documents

Publication Publication Date Title
CN104046915B (en) High performance hot-work die steel and preparation technology thereof for the die casting of heavy in section
CN104278200B (en) High-hot-strength spray-formed hot work die steel and preparation method thereof
CN104532149B (en) A kind of high tough, anti-H 2 S stress corrosion drilling tool round steel and manufacture method thereof
JP6031022B2 (en) Steel wire for bolt excellent in delayed fracture resistance, high-strength bolt, and method for producing them
CN103334061B (en) High thermal conductivity large section die-casting die steel and preparation thereof and heat treating method
WO2015197007A1 (en) Carburized alloy steel, method for preparing same, and use thereof
CN101713052B (en) Non-quenching high-toughness cold-working die steel and production process
CN104152744A (en) Low-cost medium-high-strength corrosion-resistant titanium alloy and processing method thereof
JP6156574B2 (en) Thick and high toughness high strength steel sheet and method for producing the same
JP2011001573A (en) Tool steel for hot work and steel product using the same
CN100535164C (en) Fe-36Ni based alloy wire and manufacturing method thereof
CN104328353B (en) A kind of rare-earth type 0Cr17Ni4Cu4Nb martensitic precipitations and preparation method thereof
CN101724789B (en) Austenitic stainless steel medium-thick plate and manufacture method thereof
CN103526111B (en) Hot-rolled plate band steel with yield strength being 900MPa and preparation method thereof
KR101186445B1 (en) Member produced by powder forging, powder mixture for powder forging, process for producing member by powder forging, and fracture splitting connecting rod obtained from the same
CN103276298B (en) It is high hard that high-ductility is cold and hot doubles as die steel and production method thereof
CN102086494B (en) High-chromium martensitic heat-resistant steel and manufacturing method thereof
JP5296554B2 (en) Method for producing an internal combustion engine valve and the valve obtained by this method
CN103898415B (en) A kind of modified version Cr8 Steel Roll and preparation method thereof
CN104532154A (en) High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof
CN108220766B (en) Cr-V hot work die steel and preparation method thereof
CN101717896B (en) High strength and toughness cold working die steel and preparation method thereof
CN102312172B (en) B3R hot work die steel with high strength and toughness and resistance to tempering, and preparation process thereof
CN103409688B (en) Large forged high-speed steel cold roll and manufacturing method thereof
CN100482842C (en) High malleable high wear-resisting cold process mould steel

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20121010

C02 Deemed withdrawal of patent application after publication (patent law 2001)