CN108342662B - High-strength weathering steel with yield strength of 550MPa - Google Patents

High-strength weathering steel with yield strength of 550MPa Download PDF

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CN108342662B
CN108342662B CN201810154871.7A CN201810154871A CN108342662B CN 108342662 B CN108342662 B CN 108342662B CN 201810154871 A CN201810154871 A CN 201810154871A CN 108342662 B CN108342662 B CN 108342662B
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CN108342662A (en
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李宗强
邓深
樊雷
杨跃标
张金旺
袁勤攀
梁武三
赵忠云
陈盛淋
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Liuzhou Iron and Steel Co Ltd
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    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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

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Abstract

The invention provides high-strength weathering steel with yield strength of 550 MPa. The high-strength weathering steel with the yield strength of 550MPa comprises the following chemical components in percentage by weight: 0.03-0.08 wt%, Si is less than or equal to 0.15 wt%, Mn: 0.70-1.40 wt%, P is less than or equal to 0.020 wt%, S is less than or equal to 0.008 wt%, Alt: 0.020-0.050 wt%, N is less than or equal to 0.006 wt%, Cu: 0.20-0.55 wt%, Cr: 0.30-0.60 wt%, Ni: 0.04-0.20 wt%, Ti: 0.05-0.09 wt%; the balance of Fe and inevitable trace elements. According to the invention, through the optimized design of the components, niobium and vanadium are not added, the cost is reduced, the N content in the steel is strictly controlled, the stable production of the product is realized, and the high-strength weathering steel with stable mechanical properties and good cold bending and impact properties is obtained.

Description

High-strength weathering steel with yield strength of 550MPa
Technical Field
The invention relates to the field of metallurgy, in particular to high-strength weathering steel with yield strength of 550 MPa.
Background
The high-strength weathering steel is weathering steel (atmospheric corrosion resistant steel) with the yield strength of more than or equal to 450 MPa. The development and production of the high-strength weathering steel mainly meet the updating and upgrading requirements of steel used in the industries such as new-generation containers, railway freight carriages, high-speed train carriages, communication and power transmission towers, bridges, heavy-duty automobile manufacturing and the like, and realize the safety and environmental protection requirements of improving the strength, reducing the self weight, saving energy and reducing consumption. With the economic development of China, the logistics industry is rapidly increased, and the high-strength weathering steel plays an important role in weight reduction, speed increase, cargo capacity increase, logistics cost reduction, equipment service life prolonging and the like.
Chinese patent application No. 200910301054.0 discloses a high-strength atmospheric corrosion resistant steel and a production method thereof, wherein the chemical components of the atmospheric corrosion resistant steel plate manufactured by the method are that C is less than or equal to 0.12 wt%, Si is less than or equal to 0.75 wt%, Mn is less than or equal to l.5 wt%, P is less than or equal to 0.025 wt%, S is less than or equal to 0.008 wt%, and Cr: 0.30-1.25 wt%, Ni: o.12-0.65 wt%, Cu: o.2-0.55 wt%, Nb: 0.015 to 0.03 wt%, V: 0.09-0.15 wt%, Ti: 0.006-0.02 wt%, N: 0.0l to 0.02 wt%, the balance being Fe and unavoidable impurities. The method adds noble alloys such as Nb, V and the like into the steel, and has high production cost.
In summary, the following problems exist in the prior art: the existing high-strength weathering steel has high production cost.
Disclosure of Invention
The invention provides high-strength weathering steel with the yield strength of 550MPa, which is used for solving the problem of high production cost of the existing high-strength weathering steel.
Therefore, the invention provides high-strength weathering steel with the yield strength of 550MPa, which comprises the following chemical components in percentage by weight: 0.03-0.08 wt%, Si is less than or equal to 0.15 wt%, Mn: 0.70-1.40 wt%, P is less than or equal to 0.020 wt%, S is less than or equal to 0.008 wt%, Alt (total content of all aluminum or Al): 0.020-0.050 wt%, N is less than or equal to 0.006 wt%, Cu: 0.20-0.55 wt%, Cr: 0.30-0.60 wt%, Ni: 0.04-0.20 wt%, Ti: 0.05-0.09 wt%; the balance of Fe and inevitable trace elements.
Further, the high-strength weathering steel with the yield strength of 550MPa comprises the following chemical components in percentage by weight: 0.054 wt%, Si: 0.057 wt%, Mn: 0.81 wt%, P: 0.012 wt%, S: 0.002 wt%, Alt: 0.036 wt%, N: 0.29 wt%, Cu: 0.26 wt%, Cr: 0.35 wt%, Ni: 0.09 wt%, Ti: 0.077 wt%; the balance of Fe and inevitable trace elements, the yield strength ReL of the product is more than or equal to 550MPa, the tensile strength Rm is 620-800 MPa, the elongation A is more than or equal to 18%, and the impact absorption energy Akv at minus 40 ℃ is more than or equal to 38J.
Further, the high-strength weathering steel with the yield strength of 550MPa comprises the following chemical components in percentage by weight: 0.063 wt%, Si: 0.057 wt%, Mn: 1.24 wt%, P: 0.013 wt%, S: 0.002 wt%, Alt: 0.037 wt%, N: 0.28 wt%, Cu: 0.26 wt%, Cr: 0.36 wt%, Ni: 0.09 wt%, Ti: 0.058 wt%; the balance of Fe and inevitable trace elements, the yield strength ReL of the product is more than or equal to 550MPa, the tensile strength Rm is 620-800 MPa, the elongation A is more than or equal to 18%, and the impact absorption energy Akv at minus 40 ℃ is more than or equal to 38J.
The production method of the 550 MPa-grade high-strength weathering steel with the yield strength adopts the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, LF molten steel refining treatment, RH molten steel refining treatment, slab continuous casting, hot continuous rolling and leveling, wherein the converter molten steel smelting step comprises the following steps: the S of the molten iron fed into the furnace is required to be less than or equal to 0.040 wt%; argon is blown from bottom in the whole smelting process; the end point of the converter is controlled to be less than or equal to 0.05 wt% C and less than or equal to 0.018 wt% P.
Further, in the RH molten steel refining treatment step: the total vacuum circulation time is 15-30 min, and the ultimate vacuum retention time is more than 10 min; net cycle time is more than 3 min; after calcium treatment, soft argon blowing time is 8-10 min; the molten steel sedation time is more than or equal to 18 min.
Further, in the slab continuous casting step: and (3) steel ladle slag discharging detection control is adopted, the pouring temperature of the tundish is 1530-1560 ℃, the tundish uses an alkaline covering agent and low-carbon steel covering slag, and the casting blank drawing speed is 1.00-1.42 m/min.
Further, in the hot continuous rolling step: controlling the heating temperature of the casting blank to be 1200-1250 ℃, ensuring that the holding time of the casting blank is more than or equal to 180min under the condition that the furnace temperature is more than or equal to 1100 ℃, fully dissolving the titanium micro-alloy to control the austenite grain size, and exerting the solid solution strengthening effect of titanium micro-alloying to the maximum extent; and (3) adopting a seven-stand hot continuous rolling mill, controlling the finish rolling temperature to be 880-920 ℃, and controlling the coiling temperature to be 590-630 ℃.
Further, the thickness of the finished product is 6mm, the soaking temperature of the heating furnace is 1246 ℃, the holding time is 196min when the temperature of the furnace is more than or equal to 1100 ℃, the finishing temperature is controlled at 898 ℃, and the coiling temperature is 608 ℃.
Furthermore, the thickness of the finished product is 6mm, the soaking temperature of the heating furnace is 1250 ℃, the holding time in the furnace is not less than 1100 ℃ for 185min, the finishing temperature is controlled at 895 ℃, and the coiling temperature is 612 ℃.
Further, the thickness of the finished product is 6mm, the soaking temperature of the heating furnace is 1248 ℃, the holding time in the furnace is 189min at the temperature of more than or equal to 1100 ℃, the finishing temperature is controlled at 901 ℃, and the coiling temperature is 610 ℃.
According to the invention, through the optimized design of the components, niobium and vanadium are not added, the cost is reduced, the N content in the steel is strictly controlled, the stable production of the product is realized, and the high-strength weathering steel with stable mechanical properties and good cold bending and impact properties is obtained. The yield strength R of the cold-rolled low-alloy high-strength steel obtained by the inventioneLNot less than 550MPa, tensile strength Rm620-800 MPa, elongation A is more than or equal to 18 percent, and-40 ℃ impact absorption energy Akv≥38J。
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The high-strength weathering steel with the yield strength of 550MPa comprises the following chemical components in percentage by weight: 0.03-0.08 wt%, Si is less than or equal to 0.15 wt%, Mn: 0.70-1.40 wt%, P is less than or equal to 0.020 wt%, S is less than or equal to 0.008 wt%, Alt: 0.020-0.050 wt%, N is less than or equal to 0.006 wt%, Cu: 0.20-0.55 wt%, Cr: 0.30-0.60 wt%, Ni: 0.04-0.20 wt%, Ti: 0.05-0.09 wt%; the balance of Fe and inevitable trace elements.
The invention relates to a manufacturing method of high-strength weathering steel with yield strength of 550MPa grade, which comprises the following process routes: blast furnace molten iron smelting → molten iron desulphurization pretreatment → converter molten steel smelting → LF (ladle refining furnace) molten steel refining treatment → RH (vacuum cycle degassing refining furnace) molten steel refining treatment → slab continuous casting → hot continuous rolling → leveling → inspection, packaging and warehousing; wherein, the process characteristics of each stage are as follows:
smelting molten steel in a converter: the S of the molten iron fed into the furnace is required to be less than or equal to 0.040 wt%; argon is blown from bottom in the whole smelting process; controlling the end point of the converter to be less than or equal to 0.05 wt% of C and less than or equal to 0.018 wt% of P;
LF molten steel refining treatment: deoxidizing and alloying the molten steel in an LF furnace;
RH molten steel refining treatment: the total vacuum circulation time is 15-30 min, and the ultimate vacuum retention time is more than 10 min; net cycle time is more than 3 min; after calcium treatment, soft argon blowing time is 8-10 min; the molten steel sedation time is more than or equal to 18 min;
and (3) slab continuous casting, wherein steel ladle slag discharging detection control is adopted, the pouring temperature of a tundish is 1530-1560 ℃, the tundish uses an alkaline covering agent and uses low-carbon steel covering slag, and the casting blank drawing speed is 1.00-1.42 m/min.
The high-precision continuous casting control process adopts a casting process of weak cooling, low superheat degree, constant drawing speed and high straightening temperature (①, weak cooling, under the production condition of the same casting machine, the pressure and the flow of cooling water used by the steel are 85-95 percent of those used for producing other steel grades with the same strength, ②, the low superheat degree is controlled according to 0-20 ℃, the constant drawing speed is ③, the fluctuation range of the continuous casting drawing speed is controlled within 0.1m/min, ④, the high straightening temperature is ④, the straightening temperature of a continuous casting billet is increased to 900-950 ℃, the high-temperature brittleness range of the casting billet is kept from 730 ℃ -880 ℃), and the generation of surface cracks of a slab is effectively reduced.
Hot continuous rolling: controlling the heating temperature of the casting blank to be 1200-1250 ℃, ensuring that the holding time of the casting blank is more than or equal to 180min under the condition that the furnace temperature is more than or equal to 1100 ℃, fully dissolving the titanium micro-alloy to control the austenite grain size, and exerting the solid solution strengthening effect of titanium micro-alloying to the maximum extent; and (3) adopting a seven-stand hot continuous rolling mill, controlling the finish rolling temperature to be 880-920 ℃, and controlling the coiling temperature to be 590-630 ℃.
In the invention, the following measures are also taken:
the N in the molten steel is controlled to be less than or equal to 0.006 wt%, the precipitation of Ti and N in the liquid molten steel in the slab continuous casting process is reduced, and the damage effect of TiN precipitates with coarse sizes on the toughness of the 550 MPa-grade high-strength weathering steel can be reduced;
a small amount of Ti is added into the steel to reduce the content of N reacting with Al element, so that the precipitation of AlN is inhibited, and the surface cracks of the casting blank are effectively reduced.
The production method of the high-strength weathering steel with the yield strength of 550MPa adopts the following component proportion and specific process. Wherein, Table 1 shows the compositions (in weight%) of the steels of the respective examples. Table 2 shows the process parameters corresponding to the examples described in table 1. Table 3 shows the mechanical properties corresponding to the examples in table 1. In table 1, the compositions of example 1 and example 2 are the same but the process parameters are different, the compositions of example 3 and example 4 are the same but the process parameters are different, and the compositions of example 1 and example 3 are different.
The high-strength weathering steel with the yield strength of 550MPa and the manufacturing method thereof ensure that the yield strength R of the product is higheLNot less than 550MPa, tensile strength Rm620-800 MPa, elongation A is more than or equal to 18 percent, and-40 ℃ impact absorption energy Akv≥38J。
Further, the product yield strength ReLGreater than or equal to 590MPa, tensile strength RmMore than 650MPa, elongation A more than or equal to 20 percent, and-40 ℃ impact absorption energy AkvNot less than 42J. Wherein the elongation A can reach 23.3 percent, and the impact absorption energy A at minus 40 DEG CkvUp to 52J.
Further, the product yield strength ReLNot less than 610MPa, tensile strength RmMore than 670MPa, elongation A more than or equal to 21 percent, and-40 ℃ impact absorption energy Akv≥47J。
Further, the product yield strength ReLGreater than or equal to 620MPa, tensile strength RmMore than 680MPa, elongation A more than or equal to 20%, and-40 ℃ impact absorption energy Akv≥45J。
Further, the product yield strength ReLNot less than 630MPa, tensile strength RmMore than 700MPa, elongation A more than or equal to 21 percent, and-40 ℃ impact absorption energy Akv≥42J。
Table 1: chemical composition (wt%) of product
Examples of the invention C Si Mn P S Alt Ti Cu Ni Cr N
Example 1 0.054 0.057 0.81 0.012 0.002 0.036 0.077 0.26 0.09 0.35 0.29
Example 2 0.054 0.057 0.81 0.012 0.002 0.036 0.077 0.26 0.09 0.35 0.29
Example 3 0.063 0.057 1.24 0.013 0.002 0.037 0.058 0.26 0.09 0.36 0.28
Example 4 0.063 0.057 1.24 0.013 0.002 0.037 0.058 0.26 0.09 0.36 0.28
Table 2: specific process parameters of the examples
Figure GDA0001600358390000051
Table 3: mechanical properties of the low-alloy high-strength steels obtained in the examples
Figure GDA0001600358390000052
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims (7)

1. The high-strength weathering steel with the yield strength of 550MPa is characterized by comprising the following chemical components in percentage by weight: 0.03-0.08 wt%, Si is less than or equal to 0.15 wt%, Mn: 0.70-1.40 wt%, P is less than or equal to 0.020 wt%, S is less than or equal to 0.008 wt%, Alt: 0.020-0.050 wt%, N is less than or equal to 0.006 wt%, Cu: 0.20-0.55 wt%, Cr: 0.30-0.60 wt%, Ni: 0.04-0.20 wt%, Ti: 0.05-0.058 wt%; the balance of Fe and inevitable trace elements;
adopting a high-precision continuous casting control process, namely adopting a 'weak cooling + low superheat degree + constant drawing speed + high straightening temperature casting process', wherein ①, weak cooling is adopted, under the production condition of the same casting machine, the pressure and flow of the used cooling water are 85-95% of those for producing other steel grades with the same strength, ②, the low superheat degree is controlled according to 0-20 ℃, ③, the constant drawing speed is that the fluctuation range of the continuous drawing speed is controlled within 0.1m/min, ④, the high straightening temperature is that the straightening temperature of the continuous casting billet is increased to 900-950 ℃, the high-temperature brittleness interval of the casting billet is kept from 730-880 ℃, and the generation of surface cracks of the slab is effectively reduced;
in the hot continuous rolling step: controlling the heating temperature of the casting blank to be 1200-1250 ℃, ensuring that the holding time of the casting blank is more than or equal to 180min under the condition that the furnace temperature is more than or equal to 1100 ℃, fully dissolving the titanium micro-alloy to control the austenite grain size, and exerting the solid solution strengthening effect of titanium micro-alloying to the maximum extent; adopting a seven-frame hot continuous rolling mill, controlling the finish rolling temperature to be 880-920 ℃, and the coiling temperature to be 590-630 ℃;
yield strength ReL594 to 638.6MPa, tensile strength Rm659.4-705.4 MPa, elongation A not less than 20.3%, and-40 ℃ impact absorption energy Akv≥42J。
2. The high-strength weathering steel of 550MPa grade yield strength according to claim 1, characterized in that the manufacturing method of the high-strength weathering steel of 550MPa grade yield strength comprises the following process steps in sequence: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, LF molten steel refining treatment, RH molten steel refining treatment, slab continuous casting, hot continuous rolling and leveling, wherein the converter molten steel smelting step comprises the following steps: the S of the molten iron fed into the furnace is required to be less than or equal to 0.040 wt%; argon is blown from bottom in the whole smelting process; the end point of the converter is controlled to be less than or equal to 0.05 wt% C and less than or equal to 0.018 wt% P.
3. The high-strength weathering steel of 550MPa grade yield strength according to claim 2, characterized in that in the RH molten steel refining treatment step: the total vacuum circulation time is 15-30 min, and the ultimate vacuum retention time is more than 10 min; net cycle time is more than 3 min; after calcium treatment, soft argon blowing time is 8-10 min; the molten steel sedation time is more than or equal to 18 min.
4. The high-strength weathering steel of 550MPa grade yield strength according to claim 2 wherein, in the slab continuous casting step: and (3) steel ladle slag discharging detection control is adopted, the pouring temperature of the tundish is 1530-1560 ℃, the tundish uses an alkaline covering agent and low-carbon steel covering slag, and the casting blank drawing speed is 1.00-1.42 m/min.
5. The high-strength weathering steel with a yield strength of 550MPa grade as claimed in claim 2, characterized in that the thickness of the finished product is 6mm, the soaking temperature of the heating furnace is 1246 ℃, the holding time is 196min at the furnace temperature of 1100 ℃ or more, the finishing temperature is controlled at 898 ℃ and the coiling temperature is 608 ℃.
6. The high-strength weathering steel with a yield strength of 550MPa grade according to claim 2, characterized in that the thickness of the finished product is 6mm, the soaking temperature of the heating furnace is 1250 ℃, the holding time is 185min at the furnace temperature of not less than 1100 ℃, the finishing rolling temperature is controlled at 895 ℃ and the coiling temperature is 612 ℃.
7. The high-strength weathering steel with a yield strength of 550MPa grade according to claim 2, characterized in that the thickness of the finished product is 6mm, the soaking temperature of the heating furnace is 1248 ℃, the holding time is 189min at the furnace temperature of 1100 ℃ or more, the final rolling temperature is controlled at 901 ℃ and the coiling temperature is 610 ℃.
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CN109266960B (en) * 2018-09-26 2019-11-26 武汉钢铁有限公司 Using the tensile strength >=800MPa thin gauge weathering steel and method of short route production
CN109338212B (en) * 2018-09-26 2019-11-26 武汉钢铁有限公司 Using the yield strength >=550MPa thin gauge weathering steel and method of short route production
CN110923403B (en) * 2019-11-15 2021-04-27 柳州钢铁股份有限公司 Control method for improving P center segregation of weathering steel
CN111101071B (en) * 2020-02-25 2021-04-13 湖南华菱涟源钢铁有限公司 High-strength weathering steel and production method thereof
CN111926261A (en) * 2020-08-31 2020-11-13 日照钢铁控股集团有限公司 High-strength weathering steel with yield strength of 550MPa and production method thereof
CN113234988B (en) * 2021-04-15 2022-06-10 华南理工大学 Method for producing weathering steel with yield strength of 700MPa grade by online quenching and product thereof

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