KR20140051934A - A method of hot shaping and hardening a sheet steel blank - Google Patents

A method of hot shaping and hardening a sheet steel blank Download PDF

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Publication number
KR20140051934A
KR20140051934A KR1020147003040A KR20147003040A KR20140051934A KR 20140051934 A KR20140051934 A KR 20140051934A KR 1020147003040 A KR1020147003040 A KR 1020147003040A KR 20147003040 A KR20147003040 A KR 20147003040A KR 20140051934 A KR20140051934 A KR 20140051934A
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South Korea
Prior art keywords
temperature
steel sheet
curing
product
hot forming
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KR1020147003040A
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Korean (ko)
Inventor
카타리나 에릭슨
얀 라르손
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게스탐프 하르트테크 아베
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Publication of KR20140051934A publication Critical patent/KR20140051934A/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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • 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
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite

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

Abstract

The steel sheet blank is formed in a cooled tool pair which rapidly heats the formed product until it is heated to austenite range and the temperature of the product drops slightly below the temperature (Ms) for the onset of formation of maltzenite. Cooling is rapidly blocked and the temperature of the product is raised until it exceeds Ms and held there until the material contains more than 50 volume percent bainite. A short time at the Ms temperature is preferred for the formation of bainite and shortens the retention time.

Figure P1020147003040

Description

Technical Field [0001] The present invention relates to a method of hot forming and hardening steel sheet blanks,

The present invention relates to a method of hot forming and curing a steel sheet blank by forming a heated material in the austenite range within a pair of tools that rapidly cool the shaped article.

In the automotive industry, press-hardening techniques, that is to say a steel sheet blank of a hardenable boron steel, formed in a cooled pair of tools heated to austenite range and held in the tool pair by a pair of tools, Products of high strength steel formed and hardened by the technique of obtaining this maltzenite structure are increasingly being used. This process results in tensile strengths in excess of 1400 MPa. Subsequent processing, such as punching or laser cutting of the edges, is performed on the cured material, but sometimes rapid cooling of the parts to be subsequently processed is avoided to avoid processing of the fully cured material.

The steel with bainite structure can have a tensile strength almost equal to that obtained by the press-cure process, but the bainite structure is stronger and more ductile than the maltitanium structure. US 6,149,743 describes a method for bainite curing. The material is rapidly cooled from the austenite range to a slightly over-temperature of Ms (the temperature for starting the formation of maltitanium), which is maintained for approximately 10 hours and toward the end of its holding time, . This process can also be used for roller bearings.

It is an object of the present invention to produce products having better material properties than those produced by conventional press-curing processes in an economical manner. Another purpose is to create the possibility of subsequent machining before the product is fully cured.

The formed product is rapidly cooled until the temperature of the product falls below the temperature for the start of the formation of maltitanium, and then the temperature of the product is raised until it exceeds the temperature for the start of the formation of maltitanium, It is maintained until the knight is formed. The time and temperature for the formation of the maltitanium and the formation of the bainite can be selected so that the material contains more than 50% by volume bainite. Formation and rapid cooling take several seconds while maintaining the heat takes a few minutes. The time (holding time) for holding the heat can also be used for subsequent machining, for example edge cutting.

1 is a time-temperature diagram for an example of a process according to the present invention,
2 is a block diagram showing the process.

Figure 2 shows a block diagram for the austenite phase in the furnace 11, the forming phase in the cooled forming tool 12, and the subsequent temperature held in the furnace 13.

The temperature curve of FIG. 1 for an example process according to the present invention shows the first portion 20 heating the blank in the furnace in the austenite range. Moving the material into a cooled forming tool pair [the curved portion 21 of the temperature curve] normally takes 5-10 seconds and involves a small decrease in temperature. Formation in a pair of cooling tools is about 1 second or a few seconds, but the product must stay in the tools until it is cooled down slightly below Ms (the temperature for the start of maltogenic formation). The formation of maltzenite is instantaneous and is not a function of temperature or a function of time. This cooling is thus accomplished by a pair of tools as a fixture. Formation and rapid cooling were denoted by reference numeral 22. The product is rapidly withdrawn from the tool pair and is accompanied by a temperature rise (23) which can generate heat at the onset of maltantite formation and exceed Ms. Additional heat, for example induction heat or radiant heat, can be used to rapidly raise the temperature above the Ms temperature. The product is then moved to a furnace where the product is maintained at a very uniform temperature slightly exceeding Ms for some of the re-presented curves 24. The product is then speeded up as indicated by the air cooled or curved portion 26, which is re-presented with the curved portion 25 of the dotted line.

The onset of the formation of maltitanium prefers bainite formation and the retention time for bainite formation is generally shortened to less than 30 minutes or less than 10 minutes or even less than 1 minute. This is a prerequisite for economic process. The amount of maltansite can be predetermined by how much the temperature is lowered to below Ms. The temperature for the formation of the bainite can be made to vary by several tens degrees and thus the holding time can be used for subsequent processing, for example edge cutting, and subsequent processing is carried out before the material reaches its full hardness Is advantageous because it reduces tool wear and also reduces the risk of crack initiation and the risk of subsequent formation of cracks when the product is used. Subsequent machining can also be incorporated into the shaping tool or integrated into the curved portion 22. That is, it can be carried out before or during the formation of the maltitanium.

In the modified process the product can be formed in a first pair of tools and can be cooled slightly above Ms and the formed product can then be moved to a second pair of tools which form the fixture and the product is cooled down to a bit below the Ms temperature . This second pair of tools can perform subsequent machining, e. G. Edge cutting, at the same time before the product is moved to the furnace for holding the heat. Alternatively, subsequent machining can be integrated into the first tool pair. The two tool pairs can be machined simultaneously, which shortens the cycle time.

Boron steel, i. E. Carbon-manganese steel with boron, is used for conventional press curing where it is fully cured with maltinite. Carbon-silicon-manganese steel may be suitably used in the process according to the invention. The steel may have a carbon content of 0.2 to 0.3 wt.%, A manganese content of 1-2 wt.% And a silicon content of 1-2 wt.%. In addition, chromium and other conventional alloying materials with a total content of less than 1 wt% may be present. Silicon prevents the separation of cementite and produces the desired microstructure.

Claims (7)

A method of hot forming and curing a steel sheet blank by forming a heated blank in austenite range within a pair of tools that rapidly cool formed products,
The formed product is cooled until the temperature of the product falls below the temperature (Ms) for the start of maltitanium formation, and the temperature of the product then rises when it exceeds the temperature for the start of maltitanium formation, To form bainite. ≪ RTI ID = 0.0 >
A method for hot forming and curing a steel sheet blank.
The method according to claim 1,
Wherein the elevated heat is maintained for a retention time of 1 to 20 minutes.
A method for hot forming and curing a steel sheet blank.
The method according to claim 1,
Wherein the temperatures are selected so that the material contains bainite greater than 50% by volume.
A method for hot forming and curing a steel sheet blank.
4. The method according to any one of claims 1 to 3,
Characterized in that the formed product is processed directly in the tool pair.
A method for hot forming and curing a steel sheet blank.
5. The method according to any one of claims 1 to 4,
The material is molded in a first pair of tools and cooled below a temperature above Ms and the formed blank is then moved to a second pair of tools and further cooled to a temperature below < RTI ID = 0.0 > Ms <≪ / RTI >
A method for hot forming and curing a steel sheet blank.
6. The method of claim 5,
Characterized in that the formed product is subsequently machined in said first tool pair.
A method for hot forming and curing a steel sheet blank.
6. The method of claim 5,
Characterized in that the formed product is subsequently machined in said second tool pair.
A method for hot forming and curing a steel sheet blank.
KR1020147003040A 2011-07-06 2012-07-04 A method of hot shaping and hardening a sheet steel blank KR20140051934A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1100523-8 2011-07-06
SE1100523A SE535821C2 (en) 2011-07-06 2011-07-06 Ways to heat mold and harden a sheet metal blank
PCT/SE2012/000104 WO2013006108A1 (en) 2011-07-06 2012-07-04 A method of hot-shaping and hardening a sheet steel blank

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KR20140051934A true KR20140051934A (en) 2014-05-02

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Country Status (7)

Country Link
US (1) US20150090378A1 (en)
EP (1) EP2729587A4 (en)
JP (1) JP2014524979A (en)
KR (1) KR20140051934A (en)
CN (1) CN103582707A (en)
SE (1) SE535821C2 (en)
WO (1) WO2013006108A1 (en)

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DE102014016614A1 (en) * 2014-10-31 2016-05-04 Salzgitter Flachstahl Gmbh Process for producing a component by forming a steel circuit board
EP3327152B1 (en) * 2016-11-29 2023-10-11 Tata Steel UK Limited Method for hot-forming a steel blank
KR102477323B1 (en) 2016-11-29 2022-12-13 타타 스틸 이즈무이덴 베.뷔. Manufacturing method of hot-formed article and obtained article
WO2018174082A1 (en) 2017-03-24 2018-09-27 新日鐵住金株式会社 Hat member and manufacturing method therefor
US11283395B2 (en) 2018-03-23 2022-03-22 Nextracker Inc. Multiple actuator system for solar tracker
US11387771B2 (en) 2018-06-07 2022-07-12 Nextracker Llc Helical actuator system for solar tracker
US11050383B2 (en) 2019-05-21 2021-06-29 Nextracker Inc Radial cam helix with 0 degree stow for solar tracker

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Also Published As

Publication number Publication date
SE1100523A1 (en) 2013-01-02
CN103582707A (en) 2014-02-12
US20150090378A1 (en) 2015-04-02
EP2729587A4 (en) 2015-03-18
EP2729587A1 (en) 2014-05-14
SE535821C2 (en) 2013-01-02
JP2014524979A (en) 2014-09-25
WO2013006108A1 (en) 2013-01-10

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