CN110273051A - The method of alloy steel hardenability narrowband control - Google Patents

The method of alloy steel hardenability narrowband control Download PDF

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Publication number
CN110273051A
CN110273051A CN201910640422.8A CN201910640422A CN110273051A CN 110273051 A CN110273051 A CN 110273051A CN 201910640422 A CN201910640422 A CN 201910640422A CN 110273051 A CN110273051 A CN 110273051A
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China
Prior art keywords
alloy steel
harden ability
hardenability
value
narrowband control
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CN201910640422.8A
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Chinese (zh)
Inventor
韩玉梅
程维玮
高延祥
王刚
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Priority to CN201910640422.8A priority Critical patent/CN110273051A/en
Publication of CN110273051A publication Critical patent/CN110273051A/en
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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
    • C21D1/55—Hardenability tests, e.g. end-quench tests
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention discloses a kind of method of alloy steel hardenability narrowband control, the step of narrowband control is carried out to alloy steel hardenability including the use of the ratio of measured value and standard theory value.The present invention is compared by the harden ability measured value of product with according to the practical chemical component theoretical calculation hardenability of product, and the design of chemical component close limit, and then the method for realizing the control of product harden ability narrowband are carried out.

Description

The method of alloy steel hardenability narrowband control
Technical field
The present invention relates to field of metallurgy more particularly to a kind of harden ability narrowband control methods.
Background technique
Gear, transmission shaft are mainly used for power transmission, can be because of gear engagement mill when its harden ability fluctuation range is larger Rejection rate caused by inconsistent caused gearbox noise increase and heat-treatment distortion is damaged to rise, thus at present to high-end narrow through hardening Property the pinion steel of bandwidth requirement, the transmission steel alloys such as axle-steel hardenability band require smaller and smaller, hardenability band requirement 5-8HRC is contracted to by 12-14HRC, and whether American-European countries or Japan, South Korea etc. are even more to propose 2-4HRC's in recent years Extremely narrow harden ability requirement, at this moment just has to the chemical Composition Control for rapidly and accurately calculating these steel grades.To reduce examination Test cost and test period.
Summary of the invention
Goal of the invention: the present invention provides a kind of methods of alloy steel hardenability narrowband control, and this method is that one kind is used for Knot steel chemical composition control range is closed in design, and then reaches the method that knot steel hardenability is closed in narrowband control.
Technical solution: the method for alloy steel hardenability narrowband control of the invention, including the use of measured value and standard theory The step of ratio of value carries out narrowband control to alloy steel hardenability.
The method of alloy steel hardenability narrowband control, comprising the following steps:
(1) according to the chemical component of alloy steel product according to the ASTM A255-2010 " code test of measurement steel hardenability Method " calculate the harden ability theoretical value of reference point.
(2) harden ability in the harden ability measured value of the alloy steel product chemical component reference point and step (1) is managed By the ratio of value as correction factor.
(3) compare the size of the median of harden ability measured value and harden ability range to be controlled, if harden ability measured value compared with Greatly, then the content of corresponding each element is reduced on the basis of the alloy steel product chemical component, it is on the contrary then improve containing for each element Amount.
(4) the harden ability theoretical value of reference point is recalculated multiplied by ratio according to each element content set in step (3) (2) correction factor in, and gradually each element content is finely tuned until harden ability theoretical value is multiplied by correction factor and through hardening to be controlled The median of property range is almost the same.
(5) according to the hardenability band to be controlled, the control range of each element is determined.
In step (1), the alloy steel product of multiple batches should take the average value of its chemical component.
In step (2), the alloy steel product of multiple batches should take the average value of its harden ability measured value.
In step (3), the numerical value for reducing or improving is then according to the difference and each element of measured value and median to harden ability Influence determine, specifically: C:0.010-0.015, Mn:0.020-0.100, Si:0.020-0.060, Cr:0.020- 0.100, Ni:0.020-0.100, Mo:0.010-0.030.
In step (5), when the hardenability band to be controlled is 6HRC, the control range of each element is general are as follows: C: ± 0.020, Mn: ± 0.08, Si: ± 0.050, Cr: ± 0.050, Ni: ± 0.020, Mo: ± 0.015；
When the hardenability band to be controlled is 4HRC, the control range of each element is general are as follows: C: ± 0.0150, Mn: ± 0.05, Si: ± 0.040, Cr: ± 0.030, Ni: ± 0.020, Mo: ± 0.010.
Each element content must not simultaneously above or lower than setting intermediate amounts.When narrower hardenability band, then need Further shrink the content range of each element.
After the chemical component actual production designed according to the present invention, it is also necessary to according to the measured value of harden ability, constantly recycle Calculating and adjustment correction factor and chemical component, accuracy will be higher and higher.
The present invention is suitable for the steel grade harden ability by weight percentage comprising following element and content and improves: C :≤0.10- 0.55%, Mn:0.50-1.65%, Si:0.15-0.60%, Cr :≤1.35%, Ni :≤1.50%, Mo :≤0.55%, surplus For Fe and inevitable impurity.
The utility model has the advantages that the 1, present invention is by the harden ability measured value of product and according to the practical chemical component theoretical calculation of product Hardenability compares, and carries out the design of chemical component close limit, and then the method for realizing the control of product harden ability narrowband.
Specific embodiment
It is narrow to the progress of alloy steel hardenability using measured value and the ratio of standard theory value described in one embodiment of the invention Method with control.The alloys steel chemical compositions such as the pinion steel, the transmission axle-steel that are required suitable for high-end narrow hardenability band Optimization design, the constituent content scope of application are as follows: C :≤0.10-0.55, Mn:0.50-1.65, Si:0.15-0.60, Cr :≤ 1.35, Ni :≤1.50, Mo :≤0.55, surplus is Fe and inevitable impurity.
The present invention is applied to the exploitation of 20MnCr5.The harden ability of its J9, J15 require respectively by 30-43HRC, 25-39HRC Constriction is 32-36HRC, 28-32HRC, first selects the materialization of the existing 20MnCr5 product close to harden ability control range It studies point and measured value, is shown in Table 1.
The 20MnCr5 pinion steel main chemical compositions (%) and harden ability actual value and theoretical value (HRC) that table 1 selects
C Mn Si P S Cr J9 measured value J15 measured value J9 theoretical value J15 theoretical value
0.203 1.31 0.24 0.011 0.022 1.21 38.2 34.0 31.16 25.33
0.198 1.28 0.27 0.014 0.026 1.22 37.9 33.1 30.51 24.77
1 each element of table is brought into according to following formula in ASTM A255-2010 " standard test method of measurement steel hardenability " Content calculates, and show that J9, J15 harden ability theoretical value are shown in Table 1.
Initial hardness:
H=33.087+50.723 (%C)+33.662 (%C)2- 2.7048 (%C)3- 107.02 (%C)4+ 43.523 (% C)5
Carbon ratio: fC=0.54 × (%C) (C :≤0.39%)
fC=0.171+0.001 × (%C)+0.265 × (%C)2(C:0.39%-0.55%)
Manganese multiplier: fMn=3.3333 × (%Mn)+1.00 (Mn :≤1.20%)
fMn=5.10 × (%Mn) -1.12 (Mn:1.20%-1.65%)
Silicon multiplier: fSi=1.00+0.7 × (%Si)
Chromium multiplier: fCr=1.00+2.16 × (%Cr)
Nickel coefficient: fNi=1.00+0.363 × (%Ni)
Molybdenum system number: fMo=1.00+3.00 × (%Mo)
Ideal critical diameter: DI=25.4 × fC×fMn×fSi×fCr×fNi×fMo(mm)
J9=H/ (4.46324-0.0992003 × DI+0.00119387 × DI2-7.40686×DI3×10-6+ 2.26087×DI4×10-8-2.46815×DI5×10-11)
J15=H/ (5.01595-0.0957696 × DI+9.5624 × DI2×10-4-4.62213×DI3×10-6+ 8.92787×DI4×10-9-8.74859×DI5×10-13)
It is 1.234 and 1.3394 respectively by the correction factor that table 1 can calculate J9, J15 harden ability.According to actual lots Chemical component and harden ability measured value, J9 and J15 calculation formula and correction factor, first according to median J9=34HRC, J15=30HRC calculates corresponding chemical component median, then on the basis of this median, sets the control range of each element, Controlled by target value of median in view of being when actual production, and combine practical operation feasibility, the chemistry of design at Divide and harden ability numerical value bound can have overflow value, the chemical component of final 20MnCr5 and the design of corresponding harden ability are shown in Table 2.
Harden ability theoretical value and theoretical correction value (HRC) under 2 different chemical composition of table
C Mn Si Cr J9 theoretical value J9 correction value J9 target J15 theoretical value J15 correction value J15 target Remarks
0.203 1.31 0.24 1.21 31.16 38.46 31.16 33.92 Actual production heat
0.198 1.28 0.27 1.22 30.51 37.65 30.51 33.18 Actual production heat
0.18 1.19 0.22 1.11 24.75 30.54 32 24.75 26.83 28 Design lower limit value
0.19 1.22 0.26 1.14 27.34 33.74 34 27.34 29.63 30 Design median
0.20 1.25 0.30 1.17 30.11 37.16 36 30.11 32.72 32 Design upper limit value
It is produced as a trial according to the chemical Composition Control range tissue of table 2, while requiring tetra- element of C, Mn, Si, Cr must not be simultaneously Higher or lower than median.The disposable success of test, subsequently enters batch production, produces more than 5000 tons altogether, a batch more than 70, Therefrom appoint and take 20 batches, each element content, harden ability theoretical value and correction value and measured value are shown in Table 3.
Table 3 randomly selects the chemical component (%) and corresponding harden ability data (HRC) of 20 batch 20MnCr5
C Mn Si Cr J9 theoretical value J9 correction value J9 measured value J15 theoretical value J15 correction value J15 measured value
0.195 1.20 0.24 1.16 27.8 34.3 35 22.5 30.1 30
0.187 1.21 0.27 1.12 26.7 32.9 33 21.6 28.9 29
0.202 1.24 0.23 1.15 29.1 35.9 35 23.6 31.6 32
0.182 1.25 0.25 1.16 26.7 33.0 32 21.6 28.9 29
0.199 1.21 0.24 1.15 28.4 35.0 36 23.0 30.8 32
0.192 1.22 0.28 1.13 27.7 34.2 35 22.5 30.1 30
0.196 1.23 0.26 1.14 28.3 35.0 35 22.9 30.7 31
0.192 1.23 0.25 1.12 27.4 33.8 33 22.2 29.7 29
0.189 1.22 0.27 1.15 27.4 33.9 33 22.2 29.7 29
0.183 1.24 0.26 1.17 27.0 33.3 33 21.8 29.2 29
0.198 1.22 0.27 1.12 28.4 35.0 35 23.0 30.7 30
0.193 1.22 0.25 1.13 27.5 34.0 35 22.3 29.8 31
0.182 1.19 0.28 1.12 25.8 31.8 32 20.9 28.0 28
0.201 1.21 0.26 1.14 28.8 35.5 35 23.3 31.2 32
0.199 1.22 0.25 1.13 28.4 35.0 36 23.0 30.8 31
0.192 1.21 0.26 1.13 27.4 33.8 34 22.1 29.7 29
0.188 1.22 0.29 1.13 27.3 33.7 32 22.1 29.6 28
0.204 1.19 0.23 1.14 28.6 35.3 35 23.1 31.0 30
0.186 1.24 0.25 1.15 27.0 33.4 34 21.9 29.3 30
0.191 1.25 0.24 1.14 27.6 34.1 35 22.4 30.0 31
Fine using the 20MnCr5 chemical component of this method design, harden ability control, downstream client is inspecting for acceptance When, properties are good, fully meet the requirement of client.

Claims (8)

1. a kind of method of alloy steel hardenability narrowband control, it is characterised in that: including the use of measured value and standard theory value The step of ratio carries out narrowband control to alloy steel hardenability.
2. the method for alloy steel hardenability according to claim 1 narrowband control, which comprises the following steps:
(1) the harden ability theoretical value of reference point is calculated according to the chemical component of alloy steel product；
(2) by the harden ability theoretical value in the harden ability measured value of the alloy steel product chemical component reference point and step (1) Ratio as correction factor；
(3) size for comparing the median of harden ability measured value and harden ability range to be controlled, if harden ability measured value is larger, The content of corresponding each element, content that is on the contrary then improving each element are reduced on the basis of the alloy steel product chemical component；
(4) the harden ability theoretical value of reference point is recalculated multiplied by ratio (2) according to each element content set in step (3) Correction factor, and gradually fine tuning each element content until harden ability theoretical value multiplied by correction factor and harden ability range to be controlled Median it is almost the same；
(5) according to the hardenability band to be controlled, the control range of each element is determined.
3. the method for alloy steel hardenability according to claim 2 narrowband control, it is characterised in that: multiple in step (1) The alloy steel product of batch should take the average value of its chemical component.
4. the method for alloy steel hardenability according to claim 2 narrowband control, it is characterised in that: multiple in step (2) The alloy steel product of batch should take the average value of its harden ability measured value.
5. the method for alloy steel hardenability according to claim 2 narrowband control, it is characterised in that: in step (3), reduce Or then influence according to the difference and each element of measured value and median to harden ability determines the numerical value improved, specifically: C: 0.010-0.015, Mn:0.020-0.100, Si:0.020-0.060, Cr:0.020-0.100, Ni:0.020-0.100, Mo: 0.010-0.030。
6. the method for alloy steel hardenability according to claim 2 narrowband control, it is characterised in that: in step (5),
When the hardenability band to be controlled is 6HRC, the control range of each element is general are as follows: C: ± 0.020, Mn: ± 0.08, Si: ± 0.050, Cr: ± 0.050, Ni: ± 0.020, Mo: ± 0.015；
When the hardenability band to be controlled is 4HRC, the control range of each element is general are as follows: C: ± 0.0150, Mn: ± 0.05, Si: ± 0.040, Cr: ± 0.030, Ni: ± 0.020, Mo: ± 0.010.
7. the method for alloy steel hardenability according to claim 6 narrowband control, it is characterised in that: each element content must not Simultaneously above or lower than setting intermediate amounts.
8. the method for alloy steel hardenability according to claim 1 narrowband control, it is characterised in that: by weight percentage, The steel alloy includes following element and content: C :≤0.10-0.55%, Mn:0.50-1.65%, Si:0.15-0.60%, Cr :≤1.35%, Ni :≤1.50%, Mo :≤0.55%, surplus is Fe and inevitable impurity.
CN201910640422.8A 2019-07-16 2019-07-16 The method of alloy steel hardenability narrowband control Pending CN110273051A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009108340A (en) * 2007-10-26 2009-05-21 Nippon Steel Corp Quenching steel excellent in machinability and hardenability
CN102399950A (en) * 2011-11-30 2012-04-04 东北大学 Method for controlling medium plate quenching technology

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009108340A (en) * 2007-10-26 2009-05-21 Nippon Steel Corp Quenching steel excellent in machinability and hardenability
CN102399950A (en) * 2011-11-30 2012-04-04 东北大学 Method for controlling medium plate quenching technology

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
王继臣等: "20CrMnTiH齿轮钢的淬透性计算及窄淬透性带控制", 《特殊钢》 *
程维玮等: ""窄淬透性20CrMnTiH2齿轮钢棒材的研制开发"", 《现代冶金》 *

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Application publication date: 20190924