CN1169973C - Heat treating method for hot die steel made of chromium interalloy - Google Patents
Heat treating method for hot die steel made of chromium interalloy Download PDFInfo
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- CN1169973C CN1169973C CNB011134119A CN01113411A CN1169973C CN 1169973 C CN1169973 C CN 1169973C CN B011134119 A CNB011134119 A CN B011134119A CN 01113411 A CN01113411 A CN 01113411A CN 1169973 C CN1169973 C CN 1169973C
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 35
- 239000010959 steel Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 26
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title 1
- 229910052804 chromium Inorganic materials 0.000 title 1
- 239000011651 chromium Substances 0.000 title 1
- 238000000137 annealing Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 14
- 150000001844 chromium Chemical class 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 8
- 238000007669 thermal treatment Methods 0.000 claims description 4
- 238000010583 slow cooling Methods 0.000 claims description 3
- 229910001563 bainite Inorganic materials 0.000 abstract description 4
- 229910000734 martensite Inorganic materials 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- 229910001562 pearlite Inorganic materials 0.000 abstract 2
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- 238000002791 soaking Methods 0.000 description 5
- 238000004512 die casting Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The present invention relates to an annealing heat treatment method for refining structure of medium alloy chromium series hot-working die steel in metallurgy industry, which comprises: firstly, the material is heated to the austenitizing temperature, annealed, kept at the temperature, rapidly cooled to the temperature of 330DEG C and kept at the temperature of 330DEG C so as to obtain the martensite structure or the low bainite structure; secondly, the martensite structure or the low bainite structure is processed in a isothermal spheroidizing heat treatment mode: the martensite structure or the low bainite structure is heated to the temperature of A<C1>, kept at the temperature of A<C1>, cooled to the temperature of A<r1>, kept at the temperature of A<r1>, slowly cooled to the temperature of 350DEG C and taken out of the annealing furnace so as to obtain the pearlite and the carbide equilibrium state structure; finally, the pearlite and the carbide equilibrium state structure are cooled in the air to the room temperature. The hot-working die steel processed by using the present invention has the advantages that the annealing hardness is 207 to 229HB, the microscopic structure reaches the B3 level, the directional difference of the impact toughness values is obviously reduced, and the service life is long.
Description
The present invention relates to the heat treating method of metallurgy industry steel alloy, refer in particular to the heat treating method of hot-work die steel.
Die steel generally can be divided into hot-work die steel and cold-work die steel two big classes.The interalloy chromium series hot die steel is common a kind of hot-work die steel, have better heat-resisting, thermal fatigue resistance and opposing liquid aluminium alloy erosion property, but hardness is higher, the machining difficulty, therefore, finished product die steel must carry out anneal, and its hardness descends.(metallurgical industry press publishes in October, 1998 " the special steel book series-die steel " that four-players such as Xu Jin are write, ISBN 7-5024-2172-6) " the interalloy chromium series hot die steel annealing method " of the 240th～242 page of narration is a kind of conventional annealing treatment process that generally uses: at first hot-work die steel is put into the controlled atmosphere annealing furnace, be heated to 860 ℃～900 ℃ after annealing insulations, soaking time is 25mm/h; Secondly be chilled to 500 ℃ with the cooling rate that is less than or equal to 25 ℃/h; Last air cooling is to room temperature.Interalloy chromium series hot die steel after conventional anneal, though can dropping to 207～229HB, hardness satisfies mach requirement, but exist obviously not enough: microstructure is bigger, and horizontal and vertical impelling strength difference is bigger, especially laterally the notched bar impact strength extreme difference of heart portion.
The object of the present invention is to provide a kind of annealing method of interalloy chromium series hot die steel thinning microstructure, it is when keeping hot-work die steel annealing hardness 207～229HB, but the microstructure of refinement die steel, make die steel laterally, vertically and the notched bar impact strength directivity significant difference between the heart portion, surface reduce and increase, improved the high life of finished product die steel.
A kind of interalloy chromium series hot die steel heat treating method of the present invention's narration, it is characterized in that: first puts into annealing furnace with hot-work die steel material, be heated to the insulation of austenitizing high temperature (1000 ℃～1050 ℃) after annealing, soaking time is 30～40mm/h (mm is a material thickness), makes the complete austenitizing of organizing of material; Second is quickly cooled to 300 ℃～370 ℃ insulations, and soaking time is 20～30mm/h, makes the tissue of material obtain martensite or lower bainite; The 3rd carries out isothermal spheroidizing thermal treatment, with the heat-up rate of 100 ℃/h material is heated to a little more than A
C1Insulation 25～35mm/h in temperature (850 ℃～890 ℃) back is cooled to A with the cooling rate that is less than or equal to 30 ℃/h then
C1(690 ℃～740 ℃) insulation 10～15mm/h is cooled to 350 ℃ with the slow cooling rate that is less than or equal to 40 ℃/h again and goes out annealing furnace near the temperature, and the structural transformation that makes material is perlite and carbide equilibrium state tissue; Last air cooling reaches the purpose of refinement material microstructure to room temperature.
Compare with prior art, the present invention has following advantage:
1) the obvious refinement of finished product die steel material microstructure after the thermal treatment, even.
2) notched bar impact strength at each position of finished product die steel improves greatly, directivity difference dwindles.
3) high life of finished product die steel.
Embodiment:
Certain Iron And Steel Company implements the present invention to the thermal treatment of annealing of hot-work die steel H13 (4Cr5MoSiV1) material: first puts into annealing furnace with the H13 steel, is heated to 1000 ℃～1050 ℃ after annealings insulations of high temperature, and soaking time is 30mm/h; Second is quickly cooled to 330 ℃～370 ℃ insulations, and soaking time is 20mm/h; After being heated to 860 ℃～890 ℃ with material, the 3rd heat-up rate with 100 ℃/h is incubated 25mm/h, be cooled to 720 ℃～740 ℃ insulation 10～15mm/h with the cooling rate that is less than or equal to 30 ℃/h then, be cooled to 350 ℃ with the slow cooling rate that is less than or equal to 40 ℃/h again and go out annealing furnace; Last air cooling is to room temperature.H13 steel after the inventive method is handled, the notched bar impact strength of its lateral surfaces, horizontal heart portion, vertical surface, vertical heart portion reaches 420,320,430,390 (J/cm respectively
2), be much higher than the notched bar impact strength behind the conventional annealing treatment process, especially laterally the notched bar impact strength of heart portion improves 5～6 times; Elsewhere, according to the standard for acceptance NADCA of North America die casting association die casting die with senior H13 steel
#The microstructure of 207 evaluations reaches B
3Level is than the B of conventional annealing treatment process acquisition
5Level exceeds two grades.
Table 1, table 2 are respectively that interalloy chromium series hot die steel H13 (4Cr5MoSiV1) implements impact ductility test data (tempering attitude) behind the present invention's (A method) and the conventional annealing treatment process (B method) and microstructure testing data (North America die casting association die casting die is with the standard for acceptance NADCA of senior H13 steel
#207 evaluations).
Table 1 notched bar impact strength (J/cm
2)
| The position | Technology | 1 | 2 | 3 | 4 | 5 | On average |
| Lateral surfaces | The A method | 415 | 425 | 411 | 429 | 420 | 420 |
| The B method | 265 | 230 | 246 | 254 | 255 | 250 | |
| Horizontal heart portion | The A method | 316 | 318 | 322 | 321 | 323 | 320 |
| The B method | 66 | 62 | 62 | 57 | 53 | 60 | |
| Vertically surperficial | The A method | 425 | 428 | 429 | 431 | 437 | 430 |
| The B method | 375 | 377 | 380 | 383 | 385 | 380 | |
| Vertical heart portion | The A method | 381 | 389 | 395 | 391 | 394 | 390 |
| The B method | 312 | 315 | 321 | 320 | 332 | 320 |
Table 2 microstructure
| Technology | 1 | 2 | 3 | 4 | 5 | On average |
| The A method | B 2 | B 3 | B 5 | B 3 | B 3 | B 3 |
| The B method | B 5 | B 5 | B 5 | B 5 | B 5 | B 5 |
Claims (1)
1. interalloy chromium series hot die steel heat treating method is characterized in that: first puts into annealing furnace with hot-work die steel material, is heated to austenitizing high temperature after annealing insulation 30～40mm/h of 1000 ℃～1050 ℃, and mm is a material thickness; Second is quickly cooled to 300 ℃～370 ℃ insulation 20～30mm/h; The 3rd carries out isothermal spheroidizing thermal treatment, with the heat-up rate of 100 ℃/h material is heated to a little more than A
C1Be incubated 25～35mm/h after 850 ℃～890 ℃ of temperature, be cooled to 690 ℃～740 ℃ A then with the cooling rate of≤30 ℃/h
R1Temperature insulation 10～15mm/h is cooled to 350 ℃ with the slow cooling rate of≤40 ℃/h again and goes out annealing furnace; Last air cooling is to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011134119A CN1169973C (en) | 2001-06-11 | 2001-06-11 | Heat treating method for hot die steel made of chromium interalloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011134119A CN1169973C (en) | 2001-06-11 | 2001-06-11 | Heat treating method for hot die steel made of chromium interalloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1390959A CN1390959A (en) | 2003-01-15 |
| CN1169973C true CN1169973C (en) | 2004-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011134119A Expired - Fee Related CN1169973C (en) | 2001-06-11 | 2001-06-11 | Heat treating method for hot die steel made of chromium interalloy |
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| Country | Link |
|---|---|
| CN (1) | CN1169973C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007119722A1 (en) * | 2006-04-11 | 2007-10-25 | Hitachi Metals, Ltd. | Process for producing steel material |
| CN101121954B (en) * | 2006-08-08 | 2010-10-06 | 上海市机械制造工艺研究所有限公司 | H13 steel vacuum time-control quenching heat treatment technique |
| CN103710506A (en) * | 2013-12-31 | 2014-04-09 | 常州中钢精密锻材有限公司 | Forging and annealing process for die steel |
| CN104178612B (en) * | 2014-07-22 | 2016-06-08 | 中原特钢股份有限公司 | A kind of tissue miniaturization pretreating process of middle carbon Cr-Mo-V series hot die steel |
| CN113897547A (en) * | 2021-10-08 | 2022-01-07 | 内蒙古北方重工业集团有限公司 | Cr-Mo-V type medium carbon hot work die steel and tissue spheroidizing method thereof |
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2001
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| CN1390959A (en) | 2003-01-15 |
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