CN114075620A - Method for solving tempering brittleness of round-link chain - Google Patents
Method for solving tempering brittleness of round-link chain Download PDFInfo
- Publication number
- CN114075620A CN114075620A CN202111186385.1A CN202111186385A CN114075620A CN 114075620 A CN114075620 A CN 114075620A CN 202111186385 A CN202111186385 A CN 202111186385A CN 114075620 A CN114075620 A CN 114075620A
- Authority
- CN
- China
- Prior art keywords
- round
- tempering
- link chain
- chain
- brittleness
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 238000005496 tempering Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 claims abstract description 4
- 230000002441 reversible effect Effects 0.000 claims abstract description 4
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 3
- 230000006698 induction Effects 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- 230000033764 rhythmic process Effects 0.000 claims abstract description 3
- 238000005204 segregation Methods 0.000 claims abstract description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 4
- 238000009864 tensile test Methods 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- 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 Articles (AREA)
Abstract
The invention discloses a method for solving tempering brittleness of a round-link chain, when the round-link chain is produced by using a round-link chain wire rod, the tempering temperature is adjusted by adjusting the current of an induction furnace according to the performance fluctuation condition of a finished chain, the conventional tempering temperature control range is 300-400 ℃, but the current is overlarge in individual cases and the tempering temperature exceeds 450 ℃, and in addition, because the production rhythm is fast and limited by fields, the round-link chains are stacked together after tempering, the cooling rate of the round-link chain in the stack is slow, the segregation and enrichment of a P element on an austenite crystal boundary are promoted, and the high-temperature tempering brittleness is generated; the method is characterized in that: based on that the high-temperature temper brittleness is reversible, the unqualified finished product ring chain is reheated to 650-680 ℃, insulated for 1 hour, then oil-cooled, and subjected to tensile test inspection again, so that abnormal fracture does not occur any more, the plasticity index is recovered, and the performance index completely meets the corresponding technical requirements.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for solving tempering brittleness of a round-link chain.
Background
20Mn2A is a commonly used round-link chain, mainly used in transportation, hoisting and transmission in mines, docks, coal and cement plants, and the like, and is a key part and a vulnerable part of equipment, because the chain is in service in severe environments such as underground moisture and the like and is simultaneously under the action of alternating load, the round-link chain is required to have not only high strength and good toughness, but also good welding, fatigue resistance, wear resistance and other characteristics, so that the requirement on the quality of raw materials is higher and higher, and the round-link chain is required to have good internal quality and surface quality and also good comprehensive mechanical property.
However, brittle fracture often occurs at the welding position or the bending deformation position of the round-link chain in the chain knitting process, a transverse microcrack exists on the surface of the round-link chain near the fracture, no plastic deformation exists near the fracture of the round-link chain, and the analysis on the generation reason is mainly as follows: the ring chain is tempered between 450-650 ℃, the second type of temper brittleness is easy to appear by slow cooling, and the second type of temper brittleness fracture is usually along the crystal fracture. Therefore, how to solve the problem of tempering brittleness of the round-link chain is a key problem influencing the quality of products.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a method for solving the temper brittleness of a round-link chain.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for solving tempering brittleness of a round-link chain, when the round-link chain is produced by using a round-link chain wire rod, the current of an induction furnace is adjusted to adjust the tempering temperature according to the performance fluctuation condition of a finished product chain, the conventional tempering temperature control range is 300-400 ℃, but the current is overlarge in individual times and the tempering temperature exceeds 450 ℃, and in addition, because the production rhythm is fast and limited by a site, the round-link chains are stacked together in a stacking manner after being tempered, the cooling rate of the round-link chain in the stack is slow, the segregation and enrichment of a P element on an austenite crystal boundary are promoted, and the high-temperature tempering brittleness is generated; the method is characterized in that: based on the fact that the high-temperature tempering brittleness is reversible, the unqualified finished product round-link chain is reheated to 650-680 ℃, kept for 1 hour and then oil-cooled.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention is reversible based on high-temperature tempering brittleness, the unqualified finished product round-link chain is reheated to 650-680 ℃, the temperature is preserved for 1 hour, then the oil cooling is carried out, the tensile test inspection is carried out again, the abnormal fracture does not occur any more, the plasticity index is recovered, and the performance index completely meets the corresponding technical requirement.
Detailed Description
A method for solving the tempering brittleness of a round-link chain comprises the steps of reheating an unqualified finished round-link chain to 650-680 ℃, preserving heat for 1 hour, then cooling with oil, and carrying out tensile test again to check that abnormal fractures do not occur.
The specific process parameters for each example are shown in table 1 below:
TABLE 1 Heat treatment parameters
| Heating temperature (. degree.C.) | Incubation time (min) | |
| Example 1 | 652 | 60 |
| Example 2 | 654 | 60 |
| Example 3 | 658 | 60 |
| Example 4 | 654 | 60 |
| Example 5 | 658 | 60 |
After heat preservation, oil cooling is adopted, tensile test inspection is carried out again, abnormal fracture does not occur any more, the plasticity index is recovered, and the performance index completely meets the corresponding technical requirement.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (1)
1. A method for solving the tempering brittleness of a round-link chain is characterized in that when a round-link chain is produced by using a round-link chain wire rod, the current of an induction furnace is adjusted to adjust the tempering temperature according to the performance fluctuation condition of a finished product chain, the conventional tempering temperature control range is 300-400 ℃, but the current is overlarge in individual cases, and the tempering temperature exceeds 450 ℃, and in addition, because the production rhythm is fast and limited by sites, the round-link chains are stacked together in a stacking manner after being tempered, the cooling rate of the round-link chain in the stack is slow, and the segregation and enrichment of a P element on an austenite crystal boundary are promoted, so that the high-temperature tempering brittleness is generated; the method is characterized in that: based on the fact that the high-temperature tempering brittleness is reversible, the unqualified finished product round-link chain is reheated to 650-680 ℃, kept for 1 hour and then oil-cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111186385.1A CN114075620A (en) | 2021-10-12 | 2021-10-12 | Method for solving tempering brittleness of round-link chain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111186385.1A CN114075620A (en) | 2021-10-12 | 2021-10-12 | Method for solving tempering brittleness of round-link chain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114075620A true CN114075620A (en) | 2022-02-22 |
Family
ID=80283344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111186385.1A Pending CN114075620A (en) | 2021-10-12 | 2021-10-12 | Method for solving tempering brittleness of round-link chain |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114075620A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562946A (en) * | 2011-12-03 | 2012-07-11 | 江苏欧玛机械有限公司 | High-performance round-link chain |
| CN103820608A (en) * | 2012-11-19 | 2014-05-28 | 中原特钢股份有限公司 | 35CrMnSi steel and heat treatment method for eliminating second-class temper brittleness and improving toughness of 35CrMnSi steel |
| CN105755240A (en) * | 2014-12-13 | 2016-07-13 | 重庆环德科技有限公司 | 5CrNiMo tempering process |
-
2021
- 2021-10-12 CN CN202111186385.1A patent/CN114075620A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102562946A (en) * | 2011-12-03 | 2012-07-11 | 江苏欧玛机械有限公司 | High-performance round-link chain |
| CN103820608A (en) * | 2012-11-19 | 2014-05-28 | 中原特钢股份有限公司 | 35CrMnSi steel and heat treatment method for eliminating second-class temper brittleness and improving toughness of 35CrMnSi steel |
| CN105755240A (en) * | 2014-12-13 | 2016-07-13 | 重庆环德科技有限公司 | 5CrNiMo tempering process |
Non-Patent Citations (1)
| Title |
|---|
| 赵贤平等: "20Mn2钢圆环链脆性断裂原因分析", 《失效分析与预防》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109536691B (en) | Preparation method of low-temperature impact resistant CrMo alloy steel forged circle | |
| US20180265941A1 (en) | Process for on-line quenching of seamless steel tube using residual heat and manufacturing method | |
| CN102719752B (en) | Seamless steel pipe with excellent hydrogen sulfide stress corrosion resistance and manufacturing method thereof | |
| US10227828B2 (en) | Ultra-high toughness and high strength drill pipe and manufacturing process thereof | |
| CN106521402A (en) | Whole heat treatment method for 23CrNi3MoA hollow steel rock drill rod | |
| CN102191437A (en) | Seamless steel tube for petroleum cracking and heat treatment method thereof | |
| CN105420470A (en) | Surface-hardening treatment method for austenitic steel | |
| CN114075620A (en) | Method for solving tempering brittleness of round-link chain | |
| CN107761004A (en) | A kind of heat treatment method of rolling mill guiding alloy material and rolling mill guiding | |
| CN103556059B (en) | A kind of Track link pin material | |
| CN110863147B (en) | Q690 corrosion-resistant steel for mine environment service and preparation method thereof | |
| CN104006257B (en) | The preparation process of bellows in a kind of anti-chlorine ion corrosion expansion joint and expansion joint | |
| CN102433500A (en) | Titanium-containing interstitial free (IF) steel and annealing technology | |
| CN105112634A (en) | Heat treatment process for hot-working die | |
| CN109082513A (en) | A kind of heat treatment process of large size pump case | |
| CN111676362B (en) | Novel quenching-partitioning-isothermal quenching heat treatment method capable of obtaining Si-series ultrahigh-strength disc spring | |
| CN102181787B (en) | Refractory corrosion-resisting steel as well as preparation and heat treatment method thereof | |
| CN112222204B (en) | Rolling method of steel for engine non-quenched and tempered connecting rod and manufacturing method of forge piece | |
| CN103627880B (en) | Modulus is in the mid-frequency induction hardening technique of the heavily loaded tooth bar of 50mm≤m≤150mm | |
| CN109182896B (en) | 175MPa movable elbow material and heat treatment process | |
| CN105671442A (en) | Bearing collar alloy steel and heat treatment process thereof | |
| CN109023052A (en) | A kind of rolling mill roll wear resistant alloy material and rolling mill roll heat treatment method | |
| CN103667619A (en) | Subcritical quenching technology of Cr5MoV cold-work mold steel | |
| CN115505850B (en) | Alloy material, punching die and processing treatment process | |
| CN100580121C (en) | Steel for preparing chain railway node and producing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220222 |
|
| RJ01 | Rejection of invention patent application after publication |