CN109338067A - The quenching technical of 1000MPa grades of low carbon high-strength steel plates - Google Patents
The quenching technical of 1000MPa grades of low carbon high-strength steel plates Download PDFInfo
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- CN109338067A CN109338067A CN201811295562.8A CN201811295562A CN109338067A CN 109338067 A CN109338067 A CN 109338067A CN 201811295562 A CN201811295562 A CN 201811295562A CN 109338067 A CN109338067 A CN 109338067A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of quenching technicals of 1000MPa grades of low carbon high-strength steel plate, use ladder quenching technical twice；The first time ladder quenching are as follows: for steel plate first in heating temperature AC3+ (50~70) DEG C, soaking keeps the temperature 0.5~1.0min/mm；It cools the temperature to again AC3+ (10~20) DEG C, keeps the temperature 1~1.5min/mm；Last fast cold quenching；Second of ladder quenching: steel plate is heated to AC1- (10~30) DEG C with 150~200 DEG C/h of heating speed, is then risen to AC3+ (40~50) DEG C with >=300 DEG C/h heating speed, 0.3~0.5min/mm is kept the temperature；It cools the temperature to again AC3+ (10~20) DEG C, keeps the temperature 1.0~1.5min/mm；Last fast cold quenching.This technique finished steel plate thickness x cross sectional even tissue, crystal grain is tiny, average grain size is 15 μm or less, low-temperature flexibility is increased dramatically, ratio of martensite is up to 94~98% at plate thickness a quarter, intensity improves 60MPa or more at plate thickness 1/4, and -40 DEG C of average impact function improve 50J or more, and steel plate obtains good obdurability matching.
Description
Technical field
The present invention relates to a kind of heat treatment process, especially a kind of quenching technical of 1000MPa grades of low carbon high-strength steel plate.
Background technique
It is special that 1000MPa grades of high-strength steel have in fields such as pressure vessel, mining machinery, feed-line and power stations
Demand and wide application prospect.The use of high-strength steel can effectively mitigate equipment self weight, improve working efficiency, reduce manufacture at
This.With the rapid development of economy, engineering construction high-strength steel welding quality is required it is higher and higher, the development trend of high-strength steel by
Gradually develop into the ingredient design using low-carbon, 1000MPa grades of low carbon high-strength steel exist because of its high-intensitive and superior weldability energy feature
It is more and more applied in engineering.It is 1000MPa grades of high-strength steel for intensity rank, often uses quenching-and-tempering process
Production.But with the increase of armor plate strength, the toughness plasticity of steel plate can decline；Especially low carbon high-strength steel, with the drop of carbon content
Low, the harden ability for testing steel can be gradually reduced, and the matching of steel plate obdurability becomes further difficult.And 1000MPa grades of low carbon high-strength steel
It is often used for the key position of engineer equipment, higher with toughness reguirements to stability, this is just equal in thickness tissue to steel plate
It is put forward higher requirements in even property, crystallite dimension and harden ability.
1000MPa grades of low carbon high-strength steel are easy to produce following problems using traditional quenching technical at present: (1) due to using low
The ingredient of carbon designs, and alloying element content is high, reduces Carbon diffusion rate, it is brilliant that traditional quenching technical be easy to cause steel plate to occur
The problems such as grain is coarse, and mixed crystal, harden ability is poor, nonuniform organization, general crystallite dimension are 25~30 μm.(2) due to using low-carbon
Ingredient design, the harden ability of steel plate is poor, and -40 DEG C of ballistic works of steel plate are often below 50J.Therefore traditional quenching technical cannot
Reach the requirement of steel plate obdurability, this is current 1000MPa grades of low carbon high-strength steel common problem.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of quenching technicals of 1000MPa grades of low carbon high-strength steel plate, to obtain
Obtain good obdurability matching.
In order to solve the above technical problems, the technical solution used in the present invention is: it uses ladder quenching technical twice；
The first time ladder quenching are as follows: for steel plate first in heating temperature AC3+ (50~70) DEG C, soaking keeps the temperature 0.5~1.0min/
mm；It cools the temperature to again AC3+ (10~20) DEG C, keeps the temperature 1.0~1.5min/mm；Last fast cold quenching；
Second of ladder quenching: steel plate is heated to AC1- (10~30) DEG C with 150~200 DEG C/h of heating speed, then
It is risen to AC3+ (40~50) DEG C with >=300 DEG C/h heating speed, keeps the temperature 0.3~0.5min/mm；AC3+ (10 is cooled the temperature to again
~20) 1.0~1.5min/mm DEG C, is kept the temperature；Last fast cold quenching.
Fast cold quenching of the present invention is quick water hardening.
The mass percentage of steel plate chemical component of the present invention are as follows: C 0.10%~0.11%, Si 0.20%~
0.35%, Mn 1.1%~1.4%, P 0.008%~0.0010%, S 0.003%~0.005%, Ni 1.0%~1.2%, Cr 0.4%
~0.5%, Nb 0.02%~0.03%, Al 0.03%~0.05%, Mo 0.36%~0.48%, V 0.01%~0.04%, Ti
0.01%~0.02%, B 0.0011%~0.0015%, surplus are Fe and inevitable impurity.
Quenching technical design of the invention is based on the following:
(1) first time high temperature section (AC3+ (50~70)) heating and thermal insulation makes alloy obtain sufficiently being dissolved, homogenize tissue, simultaneously
M23(C,B)6It sharply decomposes, solid solution B amount increases, and the harden ability of steel plate is improved, and quenches after steel plate is down to low-temperature zone heat preservation
The purpose of fire is to prevent steel plate excessive grain after high temperature section long-time heat preservation coarse, establishes organization foundation for second of quenching.
Before (2) second of ladder quenching when heating, AC1- (10~30) DEG C temperature is hereinafter, carry out low speed heating, it is therefore an objective to
Prevent too fast heating speed from steel plate being caused to form edge cracks；AC1- (10~30) DEG C up to AC3+ (40~50) DEG C to use
The purpose that is rapidly heated is the fast growth for preventing carbide precipitate in temperature-rise period.
(3) second of high temperature section heating and thermal insulation, it is therefore an objective to it improves austenitizing nucleation rate, homogenizes tissue, and low-temperature zone
The purpose quenched after heat preservation is to prevent steel plate excessive grain after high temperature section long-time heat preservation coarse, and it is uniform to carry out alloying element
Change, the crystal grain of steel plate is significantly refined after the quenching of two stages ladder.
The beneficial effects of adopting the technical scheme are that present invention employs ladder quenching technical twice, energy
Enough making the even tissue on 1000MPa grades of low carbon high-strength steel plate thickness sections, the harden ability of steel plate improves, and crystal grain is refined,
Solve poor traditional quenching technical steel plate nonuniform organization, harden ability, coarse grains and the problems such as there are mixed crystal.Finished product of the present invention
Steel plate thickness section structure is uniform, and crystal grain is tiny, and the crystallite dimension at plate thickness 1/4 is reduced by 25 μm or more of traditional quenching technical
For 15 μm hereinafter, low-temperature flexibility is increased dramatically, ratio of martensite is quenched up to 94%~98% than tradition at plate thickness a quarter
Fire process ratio of martensite improves 30% or more, 980~1021MPa of intensity at plate thickness 1/4, improves 60MPa or more, and -40 DEG C average
98~139J of ballistic work, improves 50J or more, and steel plate obtains good obdurability matching.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
The quenching technical of 1: this 1000MPa grade of low carbon high-strength steel plate of embodiment is described in detail below.
The chemical component of this low carbon high-strength steel plate is (wt): C 0.11%, Si 0.35%, Mn 1.4%, P 0.0010%, S
0.05%, Ni 1.2%, Cr 0.5%, Nb 0.03%, Al 0.05%, Mo 0.48%, V 0.04%, Ti 0.02%, B 0.0015%,
Surplus is Fe and inevitable impurity.Steel plate thickness is 20mm, and AC1 is 710 DEG C, and AC3 is 880 DEG C.
Quenching technical is as follows: (1) first time ladder quenches: steel plate being heated to 950 DEG C, soaking keeps the temperature 10min；Then it drops
For temperature to 900 DEG C, soaking keeps the temperature 20min；Then quick water hardening.
(2) second of ladder quenching: the quenched steel plate of first time ladder is reheated with the heating speed of 200 DEG C/h
To 680 DEG C；Then 930 DEG C are warming up to the heating speed of 300 DEG C/h, isothermal treatment for short time 6min；Then 900 DEG C are cooled to, heat preservation
20min；Then quick water hardening.
Using above-mentioned quenching technical, steel plate thickness section structure is uniform, and crystal grain is tiny, and average grain size is 15 μm, steel
The harden ability of plate greatly improves；Ratio of martensite is improved up to 98% than traditional quenching technical ratio of martensite at plate thickness a quarter
35%；Intensity 1021MPa, improves 102MPa at steel plate 1/4；- 40 DEG C of average impact function 98J, improve 51J；Steel plate obdurability
Obtain good matching.
The quenching technical of 2: this 1000MPa grade of low carbon high-strength steel plate of embodiment is described in detail below.
The chemical component of this low carbon high-strength steel plate is (wt): C 0.10%, Si 0.20%, Mn 1.1%, P 0.008%, S
0.003%, Ni 1.0%, Cr 0.4%, Nb 0.02%, Al 0.03%, Mo 0.36%, V 0.01%, Ti 0.01%, B 0.0011%,
Surplus is Fe and inevitable impurity.Steel plate thickness is 20mm, and AC1 is 719 DEG C, and AC3 is 890 DEG C.
Quenching technical is as follows: (1) first time ladder quenches: steel plate being heated to 940 DEG C, soaking keeps the temperature 20min；Then it drops
For temperature to 900 DEG C, soaking keeps the temperature 30min；Then quick water hardening.
(2) second of ladder quenching: the quenched steel plate of first time ladder is reheated with the heating speed of 200 DEG C/h
To 709 DEG C；Then 930 DEG C are warming up to the heating speed of 350 DEG C/h, isothermal treatment for short time 10min；Then 900 DEG C are cooled to, heat preservation
30min；Then quick water hardening.
Using above-mentioned quenching technical, steel plate thickness section structure is uniform, and crystal grain is tiny, and average grain size is 14 μm, plate
Ratio of martensite improves 31% than traditional quenching technical ratio of martensite up to 94% at thick a quarter；Intensity at steel plate 1/4
980MPa improves 61MPa, -40 DEG C of average impact function 139J, improves 92J, and steel plate obdurability obtains good matching.
The quenching technical of 3: this 1000MPa grade of low carbon high-strength steel plate of embodiment is described in detail below.
The chemical component of this low carbon high-strength steel plate is (wt): C 0.10%, Si 0.25%, Mn 1.3%, P 0.008%, S
0.003%, Ni 1.0%, Cr 0.4%, Nb 0.02%, Al 0.03%, Mo 0.40%, V 0.04%, Ti 0.02%, B 0.0011%,
Surplus is Fe and inevitable impurity.Steel plate thickness is 20mm, and AC1 is 712 DEG C, and AC3 is 883 DEG C.
Quenching technical is as follows: (1) first time ladder quenches: steel plate being heated to 943 DEG C, soaking keeps the temperature 0.8min/mm；So
After be cooled to 901 DEG C, soaking keeps the temperature 1.3min/mm；Then quick water hardening.
(2) second of ladder quenching: the quenched steel plate of first time ladder is reheated with the heating speed of 160 DEG C/h
To 697 DEG C；Then 931 DEG C are warming up to the heating speed of 320 DEG C/h, isothermal treatment for short time 0.4min/mm；Then 898 DEG C are cooled to,
Keep the temperature 1.3min/mm；Then quick water hardening.
Using above-mentioned quenching technical, steel plate thickness section structure is uniform, and crystal grain is tiny, and average grain size is 14 μm, plate
Ratio of martensite improves 34% than traditional quenching technical ratio of martensite up to 97% at thick a quarter；Intensity at steel plate 1/4
1019MPa improves 100MPa；- 40 DEG C of average impact function 101J, improve 54J；Steel plate obdurability obtains good matching.
The quenching technical of 4: this 1000MPa grade of low carbon high-strength steel plate of embodiment is described in detail below.
The chemical component of this low carbon high-strength steel plate is (wt): C 0.11%, Si 0.28%, Mn 1.2%, P 0.008%, S
0.004%, Ni 1.1%, Cr 0.4%, Nb 0.02%, Al 0.03%, Mo 0.36%, V 0.04%, Ti 0.015%, B
0.0011%, surplus is Fe and inevitable impurity.Steel plate thickness is 20mm, and AC1 is 714 DEG C, and AC3 is 885 DEG C.
Quenching technical is as follows: (1) first time ladder quenches: steel plate being heated to 940 DEG C, soaking keeps the temperature 0.7min/mm；So
After be cooled to 900 DEG C, soaking keeps the temperature 1.1min/mm；Then quick water hardening.
(2) second of ladder quenching: the quenched steel plate of first time ladder is reheated with the heating speed of 180 DEG C/h
To 694 DEG C；Then 928 DEG C are warming up to the heating speed of 360 DEG C/h, isothermal treatment for short time 0.4min/mm；Then 901 DEG C are cooled to,
Keep the temperature 1.4min/mm；Then quick water hardening.
Using above-mentioned quenching technical, steel plate thickness section structure is uniform, and crystal grain is tiny, and average grain size is 15 μm；Plate
Ratio of martensite improves 33% than traditional quenching technical ratio of martensite up to 96% at thick a quarter；Intensity at steel plate 1/4
1016MPa improves 97MPa；- 40 DEG C of average impact function 105J, improve 68J；Steel plate obdurability obtains good matching.
The quenching technical of 5: this 1000MPa grade of low carbon high-strength steel plate of embodiment is described in detail below.
The chemical component of this low carbon high-strength steel plate is (wt): C 0.10%, Si 0.29%, Mn 1.1%, P 0.009%, S
0.003%, Ni 1.1%, Cr 0.4%, Nb 0.025%, Al 0.04%, Mo 0.43%, V 0.03%, Ti 0.02%, B
0.0014%, surplus is Fe and inevitable impurity.Steel plate thickness is 20mm, and AC1 is 717 DEG C, and AC3 is 889 DEG C.
Quenching technical is as follows: (1) first time ladder quenches: steel plate being heated to 954 DEG C, soaking keeps the temperature 0.9min/mm；So
After be cooled to 901 DEG C, soaking keeps the temperature 1.2min/mm；Then quick water hardening.
(2) second of ladder quenching: the quenched steel plate of first time ladder is reheated with the heating speed of 150 DEG C/h
To 692 DEG C；Then 934 DEG C are warming up to the heating speed of 330 DEG C/h, isothermal treatment for short time 0.45min/mm；Then 907 are cooled to
DEG C, keep the temperature 1.2min/mm；Then quick water hardening.
Using above-mentioned quenching technical, steel plate thickness section structure is uniform, and crystal grain is tiny, and average grain size is 14 μm；Plate
Ratio of martensite improves 32% than traditional quenching technical ratio of martensite up to 95% at thick a quarter；Intensity at steel plate 1/4
1011MPa improves 92MPa；- 40 DEG C of average impact function 108J, improve 61J；Steel plate obdurability obtains good matching.
The quenching technical of 6: this 1000MPa grade of low carbon high-strength steel plate of embodiment is described in detail below.
The chemical component of this low carbon high-strength steel plate is (wt): C 0.11%, Si 0.20%, Mn 1.4%, P 0.009%, S
0.004%, Ni 1.0%, Cr 0.45%, Nb 0.03%, Al 0.04%, Mo 0.38%, V 0.02%, Ti 0.018%, B
0.0013%, surplus is Fe and inevitable impurity.Steel plate thickness is 20mm, and AC1 is 716 DEG C, and AC3 is 888 DEG C.
Quenching technical is as follows: (1) first time ladder quenches: steel plate being heated to 948 DEG C, soaking keeps the temperature 0.6min/mm；So
After be cooled to 904 DEG C, soaking keeps the temperature 1.4min/mm；Then quick water hardening.
(2) second of ladder quenching: the quenched steel plate of first time ladder is reheated with the heating speed of 170 DEG C/h
To 696 DEG C；Then 932 DEG C are warming up to the heating speed of 340 DEG C/h, isothermal treatment for short time 0.35min/mm；Then 900 are cooled to
DEG C, keep the temperature 1.1min/mm；Then quick water hardening.
Using above-mentioned quenching technical, steel plate thickness section structure is uniform, and crystal grain is tiny, and average grain size is 15 μm；Plate
Ratio of martensite improves 31% than traditional quenching technical ratio of martensite up to 94% at thick a quarter；Intensity at steel plate 1/4
999MPa improves 80MPa or more；- 40 DEG C of average impact function 131J, improve 84J or more；Steel plate obdurability obtains good
Matching.
Claims (3)
1. a kind of quenching technical of 1000MPa grades of low carbon high-strength steel plate, it is characterised in that: it uses ladder quenching technical twice；
The first time ladder quenching are as follows: for steel plate first in heating temperature AC3+ (50~70) DEG C, soaking keeps the temperature 0.5~1.0min/
mm；It cools the temperature to again AC3+ (10~20) DEG C, keeps the temperature 1.0~1.5min/mm；Last fast cold quenching；
Second of ladder quenching: steel plate is heated to AC1- (10~30) DEG C with 150~200 DEG C/h of heating speed, then
It is risen to AC3+ (40~50) DEG C with >=300 DEG C/h heating speed, keeps the temperature 0.3~0.5min/mm；AC3+ (10 is cooled the temperature to again
~20) 1.0~1.5min/mm DEG C, is kept the temperature；Last fast cold quenching.
2. the quenching technical of 1000MPa grades of low carbon high-strength steel plate according to claim 1, it is characterised in that: the rapid cooling
Quenching is quick water hardening.
3. the quenching technical of 1000MPa grades of low carbon high-strength steel plate according to claim 1 or 2, which is characterized in that the steel
The mass percentage of plate chemical component are as follows: C 0.10%~0.11%, Si 0.20%~0.35%, Mn 1.1%~1.4%, P
0.008%~0.0010%, S 0.003%~0.005%, Ni 1.0%~1.2%, Cr 0.4%~0.5%, Nb 0.02%~0.03%,
Al 0.03%~0.05%, Mo 0.36%~0.48%, V 0.01%~0.04%, Ti 0.01%~0.02%, B 0.0011%~
0.0015%, surplus is Fe and inevitable impurity.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2011157578A (en) * | 2010-01-29 | 2011-08-18 | Honda Motor Co Ltd | Method and apparatus for quenching work |
| CN102605145A (en) * | 2012-04-12 | 2012-07-25 | 王长文 | Steel isothermal quenching-tempering cooling technology |
| CN104513936A (en) * | 2014-12-19 | 2015-04-15 | 宝山钢铁股份有限公司 | Hardened and tempered high-strength steel with yield strength of 1100MPa and production method thereof |
| CN105132634A (en) * | 2015-09-21 | 2015-12-09 | 舞阳钢铁有限责任公司 | Quenching method of self-elevating ocean platform pile leg rack steel plate |
-
2018
- 2018-11-01 CN CN201811295562.8A patent/CN109338067A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011157578A (en) * | 2010-01-29 | 2011-08-18 | Honda Motor Co Ltd | Method and apparatus for quenching work |
| CN102605145A (en) * | 2012-04-12 | 2012-07-25 | 王长文 | Steel isothermal quenching-tempering cooling technology |
| CN104513936A (en) * | 2014-12-19 | 2015-04-15 | 宝山钢铁股份有限公司 | Hardened and tempered high-strength steel with yield strength of 1100MPa and production method thereof |
| CN105132634A (en) * | 2015-09-21 | 2015-12-09 | 舞阳钢铁有限责任公司 | Quenching method of self-elevating ocean platform pile leg rack steel plate |
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