CN1390959A - 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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- CN1390959A CN1390959A CN 01113411 CN01113411A CN1390959A CN 1390959 A CN1390959 A CN 1390959A CN 01113411 CN01113411 CN 01113411 CN 01113411 A CN01113411 A CN 01113411A CN 1390959 A CN1390959 A CN 1390959A
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Abstract
A technology for heat treating of hot die steel containing chromium interalloy includes such steps as heating to austenite temp, annealing, holding the temp. quickly cooling to 330 deg.C, holding the temp to obtain martensite structure or low bainite structure, heating to temp ACl, holding the temp. cooling to temp Arl, holding the temp, slowly cooling to 350 deg.C to obtain the pearlite and carbide balanced structure, and cooling in air. Its advantages are high hardness (207-229 HB), fine structure (class B3), less directional difference of impact toughness, and long service life.
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, ISBN7-5024-2172-6) " 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.
The horizontal tool steel of a kind of interalloy chromium series hot 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
R1(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 finished product die steel material microstructure after the thermal treatment is obvious
Refinement, even.
2) notched bar impact strength at each position of finished product die steel is carried greatly
High, directivity difference is dwindled.
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; In addition, 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 (1000 ℃～1050 ℃) after annealing insulation 30～40mm/h (mm is a material thickness); Second is quickly cooled to 300 ℃～370 ℃ insulation 20～30mm/h; The 3rd carries out isothermal spheroidizing thermal treatment; Heat-up rate with 100 ℃/h is heated to material 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
R1(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; 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 true CN1390959A (en) | 2003-01-15 |
| CN1169973C 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101421424B (en) * | 2006-04-11 | 2010-12-08 | 日立金属株式会社 | Process for producing steel material |
| 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 |
| CN104178612A (en) * | 2014-07-22 | 2014-12-03 | 中原特钢股份有限公司 | Structure micronization pretreatment process of medium-carbon chrome molybdenum vanadium hot work 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 |
-
2001
- 2001-06-11 CN CNB011134119A patent/CN1169973C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101421424B (en) * | 2006-04-11 | 2010-12-08 | 日立金属株式会社 | 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 |
| CN104178612A (en) * | 2014-07-22 | 2014-12-03 | 中原特钢股份有限公司 | Structure micronization pretreatment process of medium-carbon chrome molybdenum vanadium hot work 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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| Publication number | Publication date |
|---|---|
| CN1169973C (en) | 2004-10-06 |
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