CN111560499A - Annealing process of steel for high-strength-grade mining chain - Google Patents

Annealing process of steel for high-strength-grade mining chain Download PDF

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CN111560499A
CN111560499A CN202010422483.XA CN202010422483A CN111560499A CN 111560499 A CN111560499 A CN 111560499A CN 202010422483 A CN202010422483 A CN 202010422483A CN 111560499 A CN111560499 A CN 111560499A
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zone
temperature
length
annealing
steel
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CN111560499B (en
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王杨
郑宏伟
孙乐政
田宾华
赵张发
王庆龙
徐伟
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Nanjing Iron and Steel Co Ltd
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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
    • C21D1/26—Methods of annealing
    • 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
    • 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
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium

Abstract

The invention discloses an annealing process of high-strength grade mining chain steel, which is configured by higher roll speed, shortens the annealing time by more than four hours and obviously shortens the production period. By optimizing the sectional length and the sectional temperature of the annealing furnace section, reasonably distributing the distribution time of the high-temperature area and the low-temperature area, increasing the time length of the high-temperature area and maintaining the stability of the high-temperature annealing stage, the synchronous production of hot rolled materials with different specifications is realized, the requirements on hardness, texture and uniformity of the hot rolled materials can be met, the energy consumption can be greatly reduced, the production cost is reduced, and the texture production is facilitated.

Description

Annealing process of steel for high-strength-grade mining chain
Technical Field
The invention relates to an annealing process of steel, in particular to an annealing process of high-strength grade mining chain steel.
Background
The high-strength grade mining chain steel is used for manufacturing a high-strength mining C-grade round-link chain, and the manufactured chain is used for large mining machinery and is widely applied to the fields of large and super-large mines at home and abroad.
With the rapid development of scientific technology and industrial economy, the requirement on the high performance of the mining round-link chain is stricter day by day, the hardness of the hot rolled material of the C-grade round-link chain commonly used at present is higher, the uniformity of the hot rolled material cannot meet the requirement, and annealing is needed to reduce the hardness and improve the hardness and the uniformity of the structure. However, the existing annealing process has the disadvantages of slow roll speed, long production period, energy consumption and high production cost. And the hot rolled material with the specification of more than 60mm needs to be matched with the roller speed of 4.5m/h, the hot rolled material with the specification of less than 60mm needs to be matched with the roller speed of 5.0m/h, and different roller speeds are adopted to be not beneficial to production organization.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides an annealing process of high-strength-grade mining chain steel, which can shorten the production period of the steel and enable the steel to meet the requirements of hardness, structure and uniformity.
The technical scheme is as follows: the annealing process of the high-strength grade mining chain steel is carried out according to the following requirements:
(1) the initial rolling temperature is 940-1080 ℃ and the final rolling temperature is 840-940 ℃ before annealing;
(2) a roller-hearth continuous annealing furnace is adopted, the furnace section is divided into 13 zones, the total length is 65m, wherein the length of each zone 1-2 is 6m, the length of each zone 3-6 is 4m, the length of each zone 7 is 7m, the length of each zone 8 is 4m, the length of each zone 9-10 is 5.5m, the length of each zone 11-13 is 5m, and the roller speed is 7.5 m/h;
(3) the temperature of the annealing furnace 1-2 zone was set to 680 ℃, the temperature of the 3-9 zone was set to 710 ℃, the temperature of the 10-11 zone was set to 650 ℃, the temperature of the 12 zone was set to 630 ℃ and the temperature of the 13 zone was set to 600 ℃.
Has the advantages that: compared with the prior art, the annealing process is configured at a higher roll speed, the annealing time is shortened by more than four hours, and the production period is obviously shortened. By optimizing the sectional length and the sectional temperature of the annealing furnace section, reasonably distributing the distribution time of the high-temperature area and the low-temperature area, increasing the time length of the high-temperature area and maintaining the stability of the high-temperature annealing stage, the synchronous production of hot rolled materials with different specifications is realized, the requirements on hardness, texture and uniformity of the hot rolled materials can be met, the energy consumption can be greatly reduced, the production cost is reduced, and the texture production is facilitated.
Drawings
Figure 1 is a time comparison of the use of the annealing process of the present invention and the prior art.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1: the steel comprises the following components in percentage by weight: c0.23 wt.%, Si 0.12 wt.%, Mn 1.20 wt.%, s0.002wt.%, P0.011 wt.%, Ni 1.04 wt.%, Cr 0.53 wt.%, Mo 0.54 wt.%, Cu 0.05 wt.%, Al 0.027 wt.%, N0.004 wt.%, balance Fe and impurities. The following steps are used for processing: (1) the initial rolling temperature before annealing is 980 ℃, the final rolling temperature is 890 ℃, and the hot rolling state hardness is 250-; (2) a roller hearth type continuous annealing furnace is adopted, the furnace section is divided into 13 zones, the total length is 65m, the lengths of the 1-2 zones are 6m, the lengths of the 3-6 zones are 4m, the length of the 7 zone is 7m, the length of the 8 zone is 4m, the length of the 9-10 zone is 5.5m, the lengths of the 11-13 zones are 5m, and the roller speed is 7.5 m/h; (3) the temperature of the annealing furnace 1-2 zone was set to 680 ℃, the temperature of the 3-9 zone was set to 710 ℃, the temperature of the 10-11 zone was set to 650 ℃, the temperature of the 12 zone was set to 630 ℃ and the temperature of the 13 zone was set to 600 ℃. Hardness in an annealed state: 190 HBW and 200 HBW. The same components are respectively used for producing the same steel products with the specifications of 45mm and 75mm as those of the steel product in the embodiment 1 by adopting the prior art, the annealing state hardness is 195-210HBW, and compared with the steel product, the fluctuation range of the invention is reduced by 5HBW, the technical requirement of hardness is met, and the stability is better.
Example 2: the steel comprises the following components in percentage by weight: c0.22 wt.%, Si 0.14 wt.%, Mn 1.18 wt.%, s0.003wt.%, P0.010 wt.%, Ni 1.00 wt.%, Cr 0.52 wt.%, Mo 0.52 wt.%, Cu 0.05 wt.%, Al 0.027 wt.%, N0.005 wt.%, balance Fe and impurities. The following steps are used for processing: (1) the initial rolling temperature before annealing is 1000 ℃, the finish rolling temperature is 890 ℃, and the hot rolling state hardness is 245-; (2) a roller hearth type continuous annealing furnace is adopted, the furnace section is divided into 13 zones, the total length is 65m, the lengths of the 1-2 zones are 6m, the lengths of the 3-6 zones are 4m, the length of the 7 zone is 7m, the length of the 8 zone is 4m, the length of the 9-10 zone is 5.5m, the lengths of the 11-13 zones are 5m, and the roller speed is 7.5 m/h; (3) the temperature of the annealing furnace 1-2 zone was set to 680 ℃, the temperature of the 3-9 zone was set to 710 ℃, the temperature of the 10-11 zone was set to 650 ℃, the temperature of the 12 zone was set to 630 ℃ and the temperature of the 13 zone was set to 600 ℃. Hardness in an annealed state: 190 HBW and 200HBW meet the technical requirements. Similarly, the same 25mm and 65mm specifications as those of example 2 were produced by the prior art using the same composition, and the hardness in the annealed state was 190-210HBW, which is still more stable in the hardness control of the present invention, and is within 10 HBW.
Example 3: the steel comprises the following components in percentage by weight: c0.21 wt.%, Si 0.25 wt.%, Mn 0.92 wt.%, s0.010wt.%, P0.013 wt.%, Ni 1.04 wt.%, Cr 0.40 wt.%, Mo 0.76 wt.%, Cu 0.07 wt.%, v0.09wt.%, Al 0.020 wt.%, N0.010 wt.%, the balance being Fe and impurities. The following steps are used for processing: (1) the initial rolling temperature before annealing is 980 ℃, the final rolling temperature is 880 ℃, and the hot rolling state hardness is 265-280 HBW; (2) a roller hearth type continuous annealing furnace is adopted, the furnace section is divided into 13 zones, the total length is 65m, the lengths of the 1-2 zones are 6m, the lengths of the 3-6 zones are 4m, the length of the 7 zone is 7m, the length of the 8 zone is 4m, the length of the 9-10 zone is 5.5m, the lengths of the 11-13 zones are 5m, and the roller speed is 7.5 m/h; (3) the temperature of the annealing furnace 1-2 zone was set to 680 ℃, the temperature of the 3-9 zone was set to 710 ℃, the temperature of the 10-11 zone was set to 650 ℃, the temperature of the 12 zone was set to 630 ℃ and the temperature of the 13 zone was set to 600 ℃. Hardness in an annealed state: 220 HBW and 230 HBW. The same components are adopted to produce the 60mm specification which is the same as that of the example 2 by adopting the prior art, the annealing state hardness is 230-245HBW, the hardness control fluctuation of the invention is smaller, and the fluctuation range is 10 HBW.
Example 4: the steel comprises the following components in percentage by weight: c0.19 wt.%, Si 0.16 wt.%, Mn 1.40 wt.%, s0.003wt.%, P0.010 wt.%, Ni 1.10 wt.%, Cr 0.60 wt.%, Mo 0.50 wt.%, Cu 0.25 wt.%, Al 0.046 wt.%, N0.0042 wt.%, balance Fe and impurities. The following steps are used for processing: (1) the initial rolling temperature before annealing is 980 ℃, the final rolling temperature is 880 ℃, and the hot rolling state hardness is 245-; (2) a roller hearth type continuous annealing furnace is adopted, the furnace section is divided into 13 zones, the total length is 65m, the lengths of the 1-2 zones are 6m, the lengths of the 3-6 zones are 4m, the length of the 7 zone is 7m, the length of the 8 zone is 4m, the length of the 9-10 zone is 5.5m, the lengths of the 11-13 zones are 5m, and the roller speed is 7.5 m/h; (3) the temperature of the annealing furnace 1-2 zone was set to 680 ℃, the temperature of the 3-9 zone was set to 710 ℃, the temperature of the 10-11 zone was set to 650 ℃, the temperature of the 12 zone was set to 630 ℃ and the temperature of the 13 zone was set to 600 ℃. Hardness in an annealed state: 195- & ltSP & gt 210 HBW. The same components are adopted to produce the specifications of 35mm and 70mm which are the same as those of the example 2 by adopting the prior art, the hardness in the annealing state is 190-210HBW, compared with the hardness in the annealing state and the hardness in the annealing state, the stability difference of the hardness in the annealing state is not large, but the annealing time of the invention is saved by nearly four and a half hours.
Example 5: the steel comprises the following components in percentage by weight: c0.26 wt.%, Si 0.18 wt.%, Mn 0.8 wt.%, s0.005wt.%, P0.009 wt.%, Ni 1.00 wt.%, Cr 0.53 wt.%, Mo 0.80 wt.%, Cu 0.25 wt.%, Al 0.05 wt.%, N0.014 wt.%, balance Fe and impurities. The following steps are used for processing: (1) the initial rolling temperature before annealing is 990 ℃, the final rolling temperature is 890 ℃, and the hot rolling state hardness is 235-; (2) a roller hearth type continuous annealing furnace is adopted, the furnace section is divided into 13 zones, the total length is 65m, the lengths of the 1-2 zones are 6m, the lengths of the 3-6 zones are 4m, the length of the 7 zone is 7m, the length of the 8 zone is 4m, the length of the 9-10 zone is 5.5m, the lengths of the 11-13 zones are 5m, and the roller speed is 7.5 m/h; (3) the temperature of the annealing furnace 1-2 zone was set to 680 ℃, the temperature of the 3-9 zone was set to 710 ℃, the temperature of the 10-11 zone was set to 650 ℃, the temperature of the 12 zone was set to 630 ℃ and the temperature of the 13 zone was set to 600 ℃. Hardness in an annealed state: 190 HBW 205 HBW. The same components and the same specifications of 30mm and 60mm as those of the example 2 are produced by adopting the prior art, the hardness in the annealing state is 195-210HBW, and the hardness and the uniformity in the annealing state meet the requirements.
Example 6: the steel comprises the following components in percentage by weight: c0.21 wt.%, Si 0.15 wt.%, Mn 0.80 wt.%, s0.002wt.%, P0.012 wt.%, Ni 0.90 wt.%, Cr 0.54 wt.%, Mo 0.76 wt.%, Cu 0.07 wt.%, v0.08wt.%, Al 0.028 wt.%, N0.0045 wt.%, the balance being Fe and impurities. The following steps are used for processing: (1) the initial rolling temperature before annealing is 980 ℃, the final rolling temperature is 880 ℃, and the hot rolling state hardness is 265-280 HBW; (2) a roller hearth type continuous annealing furnace is adopted, the furnace section is divided into 13 zones, the total length is 65m, the lengths of the 1-2 zones are 6m, the lengths of the 3-6 zones are 4m, the length of the 7 zone is 7m, the length of the 8 zone is 4m, the length of the 9-10 zone is 5.5m, the lengths of the 11-13 zones are 5m, and the roller speed is 7.5 m/h; (3) the temperature of the annealing furnace 1-2 zone was set to 680 ℃, the temperature of the 3-9 zone was set to 710 ℃, the temperature of the 10-11 zone was set to 650 ℃, the temperature of the 12 zone was set to 630 ℃ and the temperature of the 13 zone was set to 600 ℃. Hardness in an annealed state: 220 and 235 HBW. The same components and the same specifications of 15mm and 72mm as those of the example 2 are produced by adopting the prior art, the hardness in the annealing state is 230-245HBW, and the hardness and the uniformity in the annealing state meet the requirements.
Referring to fig. 1, under the combination of the number of divisions, the length and the temperature in the prior art, the roll speed must be adjusted to meet the technical requirements by taking the specification of 60mm as a boundary, and the roll speed is far less than that of the invention. Therefore, on the premise of meeting the requirements of hardness and uniformity in an annealing state, the invention realizes synchronous production of rolled materials with different specifications, shortens the time by more than four hours compared with the prior art and has obvious advantages.

Claims (6)

1. An annealing process of high-strength grade mining chain steel is characterized by comprising the following steps of:
(1) the initial rolling temperature is 940-1080 ℃ and the final rolling temperature is 840-940 ℃ before annealing;
(2) a roller-hearth continuous annealing furnace is adopted, the furnace section is divided into 13 zones, the total length is 65m, wherein the length of each zone 1-2 is 6m, the length of each zone 3-6 is 4m, the length of each zone 7 is 7m, the length of each zone 8 is 4m, the length of each zone 9-10 is 5.5m, the length of each zone 11-13 is 5m, and the roller speed is 7.5 m/h;
(3) the temperature of the annealing furnace 1-2 zone was set to 680 ℃, the temperature of the 3-9 zone was set to 710 ℃, the temperature of the 10-11 zone was set to 650 ℃, the temperature of the 12 zone was set to 630 ℃ and the temperature of the 13 zone was set to 600 ℃.
2. The annealing process of the high-strength steel for mining chains according to claim 1, wherein the as-annealed hardness is 190 to 235 HBW.
3. The annealing process of high strength grade mining chain steel according to claim 2, characterized in that the as-annealed hardness fluctuation of the same batch of steel is within 15 HBW.
4. The annealing process of the high-strength grade steel for mining chains according to claim 2, wherein the hot-rolled hardness is 245 to 280 HBW.
5. The annealing process of high strength grade mining chain steel according to claim 4, characterized in that the as-annealed hardness is reduced by at least 45HBW from the as-rolled hardness.
6. The annealing process of the high-strength steel for mining chains according to any one of claims 1 to 5, wherein the steel for mining chains consists of the following components in percentage by mass: 0.19-0.26%, Si: less than or equal to 0.25 percent, Mn: 0.80-1.40%, S: less than or equal to 0.010 percent, P: less than or equal to 0.013%, Ni: 0.90-1.10%, Cr: 0.40-0.60%, Mo: 0.50-0.80%, Cu: less than or equal to 0.25 percent, V: less than or equal to 0.13 percent, Al: 0.02-0.05%, N: less than or equal to 0.014 percent and the balance of Fe and impurities.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113667816A (en) * 2021-08-18 2021-11-19 中天钢铁集团有限公司 Annealing process of drywall nail steel semi-finished steel wire
CN113930606A (en) * 2021-10-13 2022-01-14 南京钢铁股份有限公司 Normalizing process of steel for automobile transmission shaft parts
CN114657334A (en) * 2022-03-25 2022-06-24 西宁特殊钢股份有限公司 Annealing process of mining circular chain steel 23MnNiMoCr54 with both structure control and hardness control
CN115161443A (en) * 2022-07-28 2022-10-11 江苏联峰实业有限公司 Annealing process of heat-resistant steel

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CN107557554A (en) * 2017-09-19 2018-01-09 南京钢铁股份有限公司 A kind of normalizing process of automobile shafts class bar roller bottom type annealing furnace
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