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
  • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
  • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
  • B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt
• • 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
  • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
  • C21D3/02—Extraction of non-metals
  • C21D3/04—Decarburising
• • 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
  • C21D8/0226—Hot rolling
• • 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
  • C21D8/0236—Cold rolling
• • 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
  • C22C38/06—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
  • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
  • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2265/00—Forming parameters
  • B21B2265/14—Reduction rate
• • 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
  • C21D2211/001—Austenite
• • 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
  • C21D2211/005—Ferrite

Definitions

• the invention relates to a method for calculating the self-adjusting
• vehicle components also play a decisive role in the passive safety of the passengers in terms of the behavior of the individual components under high static and dynamic loads during operation and in grass hibernation.
• Requirement Gr Cu, Ts, Zr, V and Nb are added.
• This known lightweight steel has a teilstabflistertes ⁇ -mixed crystal structure with a defined stacking fault energy with a sometimes multiple TR! P-effect, which transforms the stress- or strain-induced transformation of a face-centered y-mixed crystal ⁇ austenite) into an ⁇ -martensite (hexagonai densest cube pack ⁇ and then on further deformation into a body-centered q-martensite and retained austenite.
• TRIP Transformation Indue Piasttcity and TW! P- ⁇ Twinning Indueed Plasticsiy
• Mn and C are relatively strong austenite formers, in contrast to At, Cr and Si, which are ferrite formers.
• a combination of these elements therefore leads to the formation of the two main phases of learned and ferrite and to other phases, such as ordered ones
• Ferrite phases and / or carbon based precipitates are also play an important role in the mechanical and technological properties of these steels.
• the density of the steel can be further reduced as the proportion of Al and Si increases.
• One problem is that with increasing levels of AS or Si, casting with the known methods by macroseeding or bending of the strand or strip during solidification is made difficult or even impossible, steel with ⁇ contents> 2% forms during solidification Air an oxide (AbOs), which is extremely hard and brittle and thus makes casting and further processing difficult or even impossible.
• ABS solidification Air an oxide
• significantly cm 3 ccistechnisqhe limits make it difficult to produce lightweight structural steels with increasingly lower density below a normal density of about 7.85 g / cc.
• austenite and ferrite formers for example between 5 and almost 100%, with strengths Rm between 600 and 1200 MPa, yield strengths RpÜ, 2 from 300 to 1120 MPa and expansions A80 between 5 and 40%,
• Alloy compositions can lead to the same phase proportions of austenite and ferrite, but still have very different mechanical properties.
• the object of the invention is therefore to provide a method for calculating the autogenous autarky combination of phase fractions and mechanical properties of a given alloy composition for a transformablechtbausfaht, with the mechanical properties can be predicted in good approximation using different austenite ferrite phase portions of the steel.
• a further object is to provide a method for further processing a lightweight structural piece thus calculated and subsequently produced into a hot strip with which even lightweight construction with increased Al contents of 2.5% by weight can be safely processed.
• the problem is a method for a deformablechtbaustah! dissolved with the elements in wt .-%; C 0.02 to £ 1, 0
• the lightweight steel consists of a mixed phase of austenite and ferrite ⁇ A / F), with an austenite phase content between 100% and 5%, a strength Rm between 600 and 1200 MPa, a yield strength RpO, 2 between 300 and 1120 MPa and a
• This new method makes use of the fact that there are laws which describe the mechanical properties of this steel depending on the present composition of the laminae, with various aspects of the structural phases, in particular the resulting proportions of austenite and ferrite, playing a role in this process.
• the stars! lOMn-SAI-eCr-OjSSi-OvSC has, according to the inventive concept, a strength Rm of 795 MPa, a yield strength Rp of 721 MPa and an A80 value of 4% with a phase fraction of 42% austenite
• the advantage of the proposed method lies in the fact that, when using a horizontal strip caster, macrosectors and blowholes can be largely avoided due to very homogeneous cooling conditions in the horizontal strip caster. Since no casting powder is used in these plants, the bleaches
• Speed of the melt is equal to the speed of the circulating conveyor belt.
• the considered disadvantageous bending during solidification is thereby avoiding that the underside of the casting tape receiving the melt is supported on a plurality of juxtaposed rolls. Reinforced is the
• the length of the conveyor belt is chosen so that at the end of the conveyor belt before its deflection, the Vorband is largely solidified
• Rolling from pre-strip to hot strip can be done either in-line or separately off-line. Before off-take-rolling, the pre-strip can be either directly hot-rolled or sliced into sheets after production prior to cooling. The strip or sheet material is then reheated after eventual cooling and rewarmed and rolled for off-line rolling or slab.
• the casting process is preceded by the hot-rolling process with a horizontal
• Strip casting plant 1 consisting of a circulating conveyor belt 2 and two deflection rollers 3, 3 '. Evident is also a side seal 4, which prevents the abandoned melt S can flow down to the right and left of the conveyor belt 2.
• the melt 5 is transported by means of a pan 6 to the strip casting plant 1 and flows through an opening 7 provided in the bottom into a feed vessel 8.
• This feed vessel 8 is designed as an overflow vessel.
• a homogenization zone 10 at. This consists of a thermally insulated housing 11 and a Röligang not shown here.
• the then following first stand 12 is formed either only as a pure driver unit possibly with a small tap or as a roll unit with a predetermined puncture
• Subsequent scaffold 14 instead, with the first three scaffolds 15, 5 ', 15 "effect the actual stitch reduction, while the last frame 16 is formed as a smoothing mill.
• Reel temperature is cooled down.
• a pair of scissors 20 is arranged between the end of the route 17 and reel 19, 9 '.
• This pair of scissors 20 has the task of dividing the hot strip 18 transversely as soon as one of the two reels 19, 19 * is wound in.
• the beginning of the following hot strip 18 is then transferred to the second released hasp! 19, 9 'passed. This ensures that the sand traction is maintained over the entire length of the belt. This is particularly important in the production of donut hot strips,

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Materials Engineering (AREA)
• Physics & Mathematics (AREA)
• Crystallography & Structural Chemistry (AREA)
• Thermal Sciences (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Heat Treatment Of Sheet Steel (AREA)
• Heat Treatment Of Steel (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=53539423

Family Applications (1)

Country Status (5)

Families Citing this family (5)

Family Cites Families (14)

• 2014
  • 2014-04-17 DE DE102014005662.7A patent/DE102014005662A1/de not_active Withdrawn
• 2015
  • 2015-04-08 WO PCT/DE2015/100147 patent/WO2015158328A1/de active Application Filing
  • 2015-04-08 US US15/304,743 patent/US10435764B2/en active Active
  • 2015-04-08 EP EP15735839.1A patent/EP3131691A1/de not_active Withdrawn
  • 2015-04-08 KR KR1020167031628A patent/KR102301544B1/ko active IP Right Grant

Also Published As

Similar Documents

Legal Events