CN110565019A - high-strength low-temperature-resistant forklift gantry section steel and preparation method thereof - Google Patents

high-strength low-temperature-resistant forklift gantry section steel and preparation method thereof Download PDF

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Publication number
CN110565019A
CN110565019A CN201910932914.4A CN201910932914A CN110565019A CN 110565019 A CN110565019 A CN 110565019A CN 201910932914 A CN201910932914 A CN 201910932914A CN 110565019 A CN110565019 A CN 110565019A
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preparation
temperature
equal
steel
less
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Chinese (zh)
Inventor
霍喜伟
杜林秀
宋玉卿
高彩茹
纪进立
张园华
刘昀嘉
王德彪
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Shandong Iron and Steel Group Co Ltd SISG
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Shandong Iron and Steel Group Co Ltd SISG
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C22C38/001—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
    • C22C38/02—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention provides high-strength low-temperature-resistant forklift portal section steel and a preparation method thereof, wherein the forklift portal section steel comprises the following components in percentage by weight: c: 0.15% -0.20%, Si: 0.35-0.50%, Mn: 1.40-1.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, V: 0.07% -0.09%, Nb: 0.025 to 0.04 percent, Cr: 0.30% -0.45%, N: 0.011-0.016%, O less than or equal to 0.003%, and the balance of iron and inevitable impurities. The preparation method comprises the following steps: converter smelting, LF refining, continuous casting, billet heating, rolling and cooling after rolling. The forklift portal frame profile steel prepared by the invention is economic and reasonable in cost, and the low-temperature impact toughness is obviously improved under the premise of ensuring higher yield strength (more than or equal to 500MPa) of the material, and the impact toughness reaches more than 70J under the condition of-20 ℃. The design requirements of light weight, large load and long service life of users can be met, and the environment adaptability is wide.

Description

high-strength low-temperature-resistant forklift gantry section steel and preparation method thereof
Technical Field
the invention belongs to the technical field of steel rolling and material metallurgy, and particularly relates to high-strength low-temperature-resistant forklift portal section steel and a preparation process thereof.
Background
The mast is the most important working component of the forklift, and the performance of the mast directly determines the cargo lifting capacity of the forklift. Lightweight, high load, long life and wide environmental suitability of the door frame are always the goals pursued by forklift enterprises, and the goal can only be realized by improving the material performance. The portal section steel is a main material for manufacturing the forklift portal, bears the weight of a load and rolls the roller in the lifting process, and the mechanical property of the portal section steel determines the overall performance of the forklift.
along with the improvement of the performance of the forklift, the requirements on the strength and the low-temperature toughness of the portal frame steel are higher and higher.
CN 103866186 a, a chinese patent discloses a channel steel for a low temperature resistant forklift gantry and a preparation method thereof, wherein the channel steel for a low temperature resistant forklift gantry comprises the following chemical components in percentage by weight: 0.12-0.18% of C, 0.20-0.40% of Si, 1.35-1.55% of Mn, less than or equal to 0.030% of P, less than or equal to 0.020% of S, 0.090-0.12% of V, 0.005-0.025% of Ti, and the balance of Fe and trace impurities. The invention realizes the production of the channel steel product for the low-temperature resistant forklift portal frame by mainly using low carbon content, applying aluminum deoxidation and vanadium-titanium composite microalloying process and combining heating control and post-rolling cooling control, and the produced channel steel has good mechanical property, the yield strength is more than 460MPa, the tensile strength is more than 605MPa, and the longitudinal impact energy at minus 5 ℃ is more than 127J.
chinese patent CN 103966503 a discloses a high-strength H-shaped steel for forklift mast and its manufacturing method, which includes the steps of primary smelting molten iron, primary smelting molten steel, adjusting element content of molten steel, continuous casting, rolling and the like. The yield reaches 546MPa, the tensile strength reaches 737MPa, and the normal-temperature toughness at 20 ℃ reaches 44J.
The prior art achieves higher indexes on the strength of the section steel through methods such as component design and process control, the low-temperature resistance performance is gradually deteriorated along with the improvement of the strength of the material, and the low-temperature resistance performance of the high-strength section steel obtained by the prior art is generally insufficient due to the existence of the rule.
Disclosure of Invention
the invention aims to provide high-strength low-temperature-resistant forklift mast section steel and a preparation method thereof, which can avoid the defects of the above technology, ensure that the section steel has higher strength (more than or equal to 500MPa) and simultaneously have low-temperature resistance of more than 70J at-20 ℃. The use requirements of light weight, large load and long service life of the forklift under a low-temperature environment are met.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the high-strength low-temperature-resistant forklift portal section steel is composed of the following components in percentage by weight:
c: 0.15% -0.20%, Si: 0.35-0.50%, Mn: 1.40-1.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, V: 0.07% -0.09%, Nb: 0.025 to 0.04 percent, Cr: 0.30% -0.45%, N: 0.011-0.016%, O less than or equal to 0.003%, and the balance of iron and inevitable impurities.
the invention also provides a preparation method of the high-strength low-temperature-resistant forklift portal section steel, which comprises the following steps:
(1) converter smelting, namely deoxidizing by adopting ferro-aluminum-manganese, wherein 1.5-2.0 kilograms of ferro-aluminum-manganese is added into per ton of steel, and vanadium-nitrogen alloy, ferroniobium and medium carbon ferrochrome are added for microalloying;
(2) LF refining, namely feeding an aluminum wire at one time according to the situation after white slag is refined and adjusted, and feeding a calcium wire 0.5-1 m/ton steel before leaving the station after the temperature component of molten steel meets the pouring requirement;
(3) the continuous casting adopts full-protection casting;
(4) The heating temperature of the heating furnace is 1150-1250 ℃, the soaking temperature is 1140-1240 ℃, and the temperature is kept for more than 0.5 hour.
(5) Rolling, wherein the waist compression ratio is 1.3-2.5, the leg compression ratio is 1.2-2.4 and the finishing temperature is 840-880 ℃ in the finish rolling deformation stage.
(6) The cooling speed after rolling is less than 0.5 ℃/s.
The forklift portal frame profile steel prepared by the method has the beneficial effects that the cost is economic and reasonable, and the low-temperature impact toughness is remarkably improved to more than 70J at the temperature of minus 20 ℃ on the premise of ensuring higher yield strength (more than or equal to 500MPa) of the material. The design requirements of light weight, large load and long service life of users can be met, the environment adaptability is wide, and obvious influence on the purchasing cost of the users is avoided.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example 1:
The utility model provides a low temperature resistant fork truck portal shaped steel of high strength, its material composition is as follows according to weight percent control range:
c: 0.15% -0.20%, Si: 0.35-0.50%, Mn: 1.40-1.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, V: 0.07% -0.09%, Nb: 0.025 to 0.04 percent, Cr: 0.30% -0.45%, N: 0.011-0.016%, O less than or equal to 0.003%, and the balance of iron and inevitable impurities.
Based on the preparation method of the high-strength low-temperature-resistant forklift portal section steel, the preparation method comprises the following steps:
(1) Converter smelting, namely deoxidizing by adopting ferro-aluminum-manganese, wherein 1.5 kilograms of ferro-aluminum-manganese is added with vanadium-nitrogen alloy, ferroniobium and medium carbon ferrochrome per ton of steel for microalloying;
(2) LF refining, namely feeding an aluminum wire at one time according to the situation after white slag is refined and adjusted, and feeding a calcium wire 1 m/ton steel before leaving the station after the temperature component of molten steel meets the pouring requirement;
(3) The continuous casting adopts full-protection casting;
(4) the heating temperature of the heating furnace is 1150 ℃, the soaking temperature is 1140 ℃ and the temperature is kept for more than 0.5 hour.
(5) The waist compression ratio is 1.3, the leg compression ratio is 1.2 and the finishing temperature is 840 ℃ in the rolling finish rolling deformation stage.
(6) The cooling speed after rolling is less than 0.5 ℃/s.
The other procedures are conventional operations, and the product material object components and the properties are shown in the table 1 and the table 2 through the procedures.
TABLE 1
TABLE 2
Example 2:
The utility model provides a low temperature resistant fork truck portal shaped steel of high strength, its material composition is as follows according to weight percent control range:
C: 0.15% -0.20%, Si: 0.35-0.50%, Mn: 1.40-1.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, V: 0.07% -0.09%, Nb: 0.025 to 0.04 percent, Cr: 0.30% -0.45%, N: 0.011-0.016%, O less than or equal to 0.003%, and the balance of iron and inevitable impurities.
Based on the preparation method of the high-strength low-temperature-resistant forklift portal section steel, the preparation method comprises the following steps:
(1) And (3) smelting in a converter, and deoxidizing by adopting ferro-aluminum-manganese-iron, wherein 2 kg of ferro-aluminum-manganese-iron is used per ton of steel. Adding vanadium-nitrogen alloy, ferroniobium and medium carbon ferrochromium for microalloying;
(2) LF refining, namely feeding an aluminum wire at one time according to the situation after white slag is refined and adjusted, and feeding a calcium wire 1 m/ton steel before leaving the station after the temperature component of molten steel meets the pouring requirement;
(3) The continuous casting adopts full-protection casting;
(4) the heating temperature of the heating furnace is 1180 ℃, the soaking temperature is 1170 ℃, and the temperature is kept for more than 0.5 hour.
(5) the waist compression ratio is 1.9, the leg compression ratio is 2.0 and the finishing temperature is 850 ℃ in the rolling finish rolling deformation stage.
(6) The cooling speed after rolling is less than 0.5 ℃/s.
The other procedures are conventional operations, and the product material object components and the properties are shown in the table 3 and the table 4 through the procedures.
TABLE 3
TABLE 4
Example 3:
The utility model provides a low temperature resistant fork truck portal shaped steel of high strength, its material composition is as follows according to weight percent control range:
c: 0.15% -0.20%, Si: 0.35-0.50%, Mn: 1.40-1.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, V: 0.07% -0.09%, Nb: 0.025 to 0.04 percent, Cr: 0.30% -0.45%, N: 0.011-0.016%, O less than or equal to 0.003%, and the balance of iron and inevitable impurities.
based on the preparation method of the high-strength low-temperature-resistant forklift portal section steel, the preparation method comprises the following steps:
(1) Converter smelting, namely deoxidizing by adopting ferro-aluminum-manganese, wherein 2 kilograms of ferro-aluminum-manganese is added into per ton of steel, and vanadium-nitrogen alloy, ferroniobium and medium carbon ferrochrome are added for microalloying;
(2) LF refining, namely feeding an aluminum wire at one time according to the situation after white slag is refined and adjusted, and feeding a calcium wire 0.5 m/ton steel before leaving the station after the temperature component of molten steel meets the pouring requirement;
(3) the continuous casting adopts full-protection casting;
(4) The heating temperature of the heating furnace is 1250 ℃, the soaking temperature is 1240 ℃, and the temperature is kept for more than 0.5 hour.
(5) the waist compression ratio of the rolling finish rolling deformation stage is 2.5, the leg compression ratio is 2.4, and the finish rolling temperature is 880 ℃.
(6) The cooling speed after rolling is less than 0.5 ℃/s. The other procedures are conventional operations, and the product material object components and the properties are shown in the table 5 and the table 6 through the procedures.
TABLE 5
TABLE 6
The method can be realized by upper and lower limit values and interval values of intervals of process parameters (such as temperature, time and the like), and embodiments are not listed.
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1. the utility model provides a low temperature resistant fork truck portal shaped steel of high strength, its characterized in that, fork truck portal shaped steel comprises following component by weight percent:
c: 0.15% -0.20%, Si: 0.35-0.50%, Mn: 1.40-1.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, V: 0.07% -0.09%, Nb: 0.025 to 0.04 percent, Cr: 0.30% -0.45%, N: 0.011-0.016%, O less than or equal to 0.003%, and the balance of iron and inevitable impurities.
2. the preparation method of the high-strength low-temperature resistant forklift mast section steel as claimed in claim 1, comprising the following steps:
1) Smelting in a converter;
2) LF refining;
3) Continuous casting;
4) Heating a steel billet;
5) Rolling;
6) and cooling after rolling.
3. the preparation method according to claim 2, wherein in the step 1), converter smelting is performed by deoxidizing with ferro-aluminum-manganese, 1.5 to 2.0 kg of ferro-aluminum-manganese per ton of steel, and vanadium-nitrogen alloy, ferro-niobium and medium carbon ferrochrome are added for microalloying.
4. The preparation method according to claim 2, wherein in the step 2), the white slag is adjusted in the refining process and then the aluminum wire is fed, and after the temperature component of the molten steel reaches the pouring requirement, the calcium wire is fed for 0.5-1 m/ton of steel before the molten steel is taken out of the station.
5. the preparation method according to claim 2, wherein in the step 3), full-protection pouring is adopted for continuous casting.
6. The preparation method according to claim 2, wherein in the step 4), the billet is heated at 1150-1250 ℃, soaked at 1140-1240 ℃ and kept for more than 0.5 hour.
7. the manufacturing method according to claim 2, wherein in the step 5), the waist reduction ratio is 1.3-2.5, the leg reduction ratio is 1.2-2.4, and the finish rolling temperature is 840-880 ℃ in the finish rolling deformation stage.
8. the method for preparing the alloy material according to claim 2, wherein in the step 6), the cooling speed after rolling is less than 0.5 ℃/s.
CN201910932914.4A 2019-09-29 2019-09-29 high-strength low-temperature-resistant forklift gantry section steel and preparation method thereof Pending CN110565019A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111500937A (en) * 2020-05-28 2020-08-07 鞍钢股份有限公司 460 MPa-level bridge channel steel and production method thereof
CN111500938A (en) * 2020-05-28 2020-08-07 鞍钢股份有限公司 Channel steel with yield strength of 420MPa for bridge and production method

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Publication number Priority date Publication date Assignee Title
JPH06228635A (en) * 1993-02-04 1994-08-16 Sumitomo Metal Ind Ltd Production of steel for high strength and low yield ratio reinforcing bar
CN102618792A (en) * 2012-03-29 2012-08-01 莱芜钢铁集团有限公司 High-strength abrasion-resistant steel for engineering machinery and manufacturing method thereof
CN103882322A (en) * 2014-03-13 2014-06-25 济钢集团有限公司 590 Mpa-grade high-strength structural steel plate and manufacturing method thereof
CN103966508A (en) * 2014-05-20 2014-08-06 莱芜钢铁集团有限公司 Steel for low-temperature-resistant forklift portal and manufacturing method thereof
CN104988390A (en) * 2015-06-29 2015-10-21 舞阳钢铁有限责任公司 E-level extra-thick high-intensity steel plate produced by using continuous casting billet and production method thereof
WO2018072076A1 (en) * 2016-10-18 2018-04-26 江阴兴澄特种钢铁有限公司 Toothed rack steel plate having thickness of 177.8 mm and manufactured by continuous casting billet and manufacturing method therefor
CN108315657A (en) * 2018-05-08 2018-07-24 河北工业大学 A kind of low cost ultra-high strength and toughness steel and preparation method thereof
CN108588557A (en) * 2018-04-26 2018-09-28 东北大学 A kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb and preparation method thereof
CN109355549A (en) * 2018-12-11 2019-02-19 东北大学 A kind of steel plate and its manufacturing method with high intensity and excellent low temperature toughness
WO2019080893A1 (en) * 2017-10-27 2019-05-02 宝山钢铁股份有限公司 Steel for coiled tubing with low yield ratio and ultra-high strength and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06228635A (en) * 1993-02-04 1994-08-16 Sumitomo Metal Ind Ltd Production of steel for high strength and low yield ratio reinforcing bar
CN102618792A (en) * 2012-03-29 2012-08-01 莱芜钢铁集团有限公司 High-strength abrasion-resistant steel for engineering machinery and manufacturing method thereof
CN103882322A (en) * 2014-03-13 2014-06-25 济钢集团有限公司 590 Mpa-grade high-strength structural steel plate and manufacturing method thereof
CN103966508A (en) * 2014-05-20 2014-08-06 莱芜钢铁集团有限公司 Steel for low-temperature-resistant forklift portal and manufacturing method thereof
CN104988390A (en) * 2015-06-29 2015-10-21 舞阳钢铁有限责任公司 E-level extra-thick high-intensity steel plate produced by using continuous casting billet and production method thereof
WO2018072076A1 (en) * 2016-10-18 2018-04-26 江阴兴澄特种钢铁有限公司 Toothed rack steel plate having thickness of 177.8 mm and manufactured by continuous casting billet and manufacturing method therefor
WO2019080893A1 (en) * 2017-10-27 2019-05-02 宝山钢铁股份有限公司 Steel for coiled tubing with low yield ratio and ultra-high strength and preparation method thereof
CN108588557A (en) * 2018-04-26 2018-09-28 东北大学 A kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb and preparation method thereof
CN108315657A (en) * 2018-05-08 2018-07-24 河北工业大学 A kind of low cost ultra-high strength and toughness steel and preparation method thereof
CN109355549A (en) * 2018-12-11 2019-02-19 东北大学 A kind of steel plate and its manufacturing method with high intensity and excellent low temperature toughness

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111500937A (en) * 2020-05-28 2020-08-07 鞍钢股份有限公司 460 MPa-level bridge channel steel and production method thereof
CN111500938A (en) * 2020-05-28 2020-08-07 鞍钢股份有限公司 Channel steel with yield strength of 420MPa for bridge and production method

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