Welding of High-Strength Steel Grades With X-Pro® Laser Welder in Continuous Strip Processing Lines

2020 ◽  
Author(s):  
C. Sasse ◽  
C. Dornscheidt ◽  
J. Artel ◽  
J. Szonn
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Steel Grades ◽  
Continuous Strip

scholarly journals Overview of HSS Steel Grades Development and Study of Reheating Condition Effects on Austenite Grain Size Changes

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1988
Author(s):  
Tibor Kvackaj ◽  
Jana Bidulská ◽  
Róbert Bidulský
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
High Strength Steel ◽  
Single Phase ◽  
Hsla Steel ◽  
High Strength ◽  
Strength Properties ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Steel Grades

This review paper concerns the development of the chemical compositions and controlled processes of rolling and cooling steels to increase their mechanical properties and reduce weight and production costs. The paper analyzes the basic differences among high-strength steel (HSS), advanced high-strength steel (AHSS) and ultra-high-strength steel (UHSS) depending on differences in their final microstructural components, chemical composition, alloying elements and strengthening contributions to determine strength and mechanical properties. HSS is characterized by a final single-phase structure with reduced perlite content, while AHSS has a final structure of two-phase to multiphase. UHSS is characterized by a single-phase or multiphase structure. The yield strength of the steels have the following value intervals: HSS, 180–550 MPa; AHSS, 260–900 MPa; UHSS, 600–960 MPa. In addition to strength properties, the ductility of these steel grades is also an important parameter. AHSS steel has the best ductility, followed by HSS and UHSS. Within the HSS steel group, high-strength low-alloy (HSLA) steel represents a special subgroup characterized by the use of microalloying elements for special strength and plastic properties. An important parameter determining the strength properties of these steels is the grain-size diameter of the final structure, which depends on the processing conditions of the previous austenitic structure. The influence of reheating temperatures (TReh) and the holding time at the reheating temperature (tReh) of C–Mn–Nb–V HSLA steel was investigated in detail. Mathematical equations describing changes in the diameter of austenite grain size (dγ), depending on reheating temperature and holding time, were derived by the authors. The coordinates of the point where normal grain growth turned abnormal was determined. These coordinates for testing steel are the reheating conditions TReh = 1060 °C, tReh = 1800 s at the diameter of austenite grain size dγ = 100 μm.

Microstructures from wire-fed laser welding of high strength steel grades

2020 ◽  
Vol 32 (2) ◽  
pp. 022050
Author(s):  
Alexander F. H. Kaplan ◽  
Matthias Höfemann ◽  
Eva Vaamonde ◽  
Anandkumar Ramasamy ◽  
Bert Kalfsbeek ◽  
...  
Keyword(s):  
Laser Welding ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Grades

Structural Performance Evaluation of Built-Up Stub Steel Column with Various Steel Grades under Concentric Loading

2015 ◽  
Vol 764-765 ◽  
pp. 127-131
Author(s):  
Yang Yang ◽  
Kang Min Lee ◽  
Keun Yeong Oh ◽  
Sung Bin Hong
Keyword(s):  
Tensile Strength ◽  
High Strength Steel ◽  
Local Stability ◽  
Experimental Studies ◽  
High Strength Steels ◽  
High Strength ◽  
Design Criteria ◽  
Stability Criteria ◽  
Steel Grades ◽  
Concentric Loading

The current local stability criteria (KBC2009, AISC2010) are enacted through theoretical and experimental studies of ordinary steels, but the mechanical properties of high strength steels are different from ordinary steels. The high strength steel in the applicability of design criteria should be needed to review because of increasing market demanding for high strength steel in the high-rise and long span buildings. In this study, stub columns of H-shaped and box section with various steel grades subjected to concentric loading were investigated, and these steels were checked to the applicability of current local stability criteria. The difference between the ordinary steel and high strength steel was compared. As a result of comparison with various steel grades, most specimens were satisfied with the design criteria, but some specimens with lower tensile strength were not reached the required strength. It is considered that the uncertainty of material was the higher when the tensile strength of material was the lower.

The Role of Niobium in Lightweight Vehicle Construction

2007 ◽  
Vol 537-538 ◽  
pp. 679-686 ◽  
Author(s):  
Hardy Mohrbacher ◽  
Christian Klinkenberg
Keyword(s):  
Grain Refinement ◽  
High Strength Steel ◽  
Mechanical Performance ◽  
High Strength Steels ◽  
High Strength ◽  
Interstitial Free ◽  
Niobium Microalloying ◽  
Hsla Steels ◽  
Steel Grades ◽  
Different Characteristics

Modern vehicle bodies make intensive use of high strength steel grades to improve the weight and the mechanical performance simultaneously. A broad range of medium and extra high strength steel grades is available. These steel grades have different characteristics concerning strength, formability and weldability. For many steel grades microalloying by niobium is the key to achieve their characteristic property profile. In HSLA steels niobium enhances the strength primarily by grain refinement. In interstitial free high strength steels niobium serves as a stabilizing element and also assists in obtaining the bake hardening effect. Some modern multiphase steels rely on niobium to achieve additional strength via grain refinement and precipitation hardening. Microstructural control provides a way to further optimize properties relevant to automotive processing such as cutting, forming and welding. The relevance of niobium microalloying in that respect will be outlined.

Inductively supported laser beam welding of high and ultra high strength steel grades

2008 ◽  
Author(s):  
Katrin Harley ◽  
Heinz Haferkamp ◽  
Andreas Ostendorf ◽  
Dirk Herzog ◽  
Peter Kallage
Keyword(s):  
Laser Beam ◽  
High Strength Steel ◽  
Laser Beam Welding ◽  
High Strength ◽  
Ultra High Strength Steel ◽  
Steel Grades

Ermüdung von Schweißverbindungen höher- und hochfester warmgefertigter nahtloser Stahlbauhohlprofile MSH/Fatigue of Welded Connections at Hot Finished Higher Strength or High Strength Hollow Sections

Konstruktion ◽  
2018 ◽  
Vol 70 (01-02) ◽  
pp. 76-81
Author(s):  
Bernd Kranz ◽  
Jörg Herrmann ◽  
Ronny Baum ◽  
Boris Straetmans
Keyword(s):  
Fatigue Strength ◽  
Boundary Conditions ◽  
Fatigue Test ◽  
High Strength Steel ◽  
High Strength ◽  
Machine Construction ◽  
Hollow Section ◽  
Steel Grades ◽  
Additional Reference

Inhalt: Dauerfestigkeit geschweißter Hohlprofilkonstruktionen ist für viele Anwendungen im Maschinenbau relevant. Für Schweißverbindungen höher- und hochfester Hohl- profilwerkstoffe gibt es aber nur eine begrenzte Anzahl verfügbarer Angaben. Ziel der vorliegenden Untersuchung an drei höher- und hochfesten Werkstoffen ist die Ermittlung von Wöhlerlinien bei unterschiedlichen Verarbeitungsrandbedingungen. Konkret wurden dazu konventionelle MSG Schweißverbindungen an bauteilähnlichen Proben ohne und mit Nahtvorbereitung sowie mit Nahtvorbereitung und Vorwärmen hergestellt und Ermüdungsversuchen unterzogen. Konstrukteuren und Verarbeitern dienen diese als weitere Referenz zur optimalen Nutzung der vorgestellten Verbindungen und Werkstoffe.   Abtract: Fatigue strength of welded hollow section designs is relevant for many applications in machine construction. For welded connections of higher strength or high strength hollow sections only a limited amount of data is available. Objective of the present research on three higher strength or high strength steel grades is the determination of Wöhler curves for different boundary conditions for processing. In practice components of conventionally GMAW welded-connections had been manufactured, without weld preparation, with weld preparation and with weld preparation and preheating – subsequently a fatigue test was done. Results serve designers and manufacturers as additional reference for optimized use of the presented joints and steel grades.

scholarly journals Prediction of the Shear Tension Strength of Resistance Spot Welded Thin Steel Sheets from High- to Ultrahigh Strength Range

2021 ◽  
Author(s):  
Kornél Májlinger ◽  
Levente T. Katula ◽  
Balázs Varbai
Keyword(s):  
High Strength Steel ◽  
Welding Process ◽  
High Strength ◽  
Professional Literature ◽  
Resistance Spot ◽  
Base Materials ◽  
Ultra High Strength Steel ◽  
Steel Grades ◽  
Steel Joints ◽  
Tension Strength

The tensile strength of newly developed ultra-high strength steel grades is now above 1800 MPa, and even new steel grades are currently in development. One typical welding process to join thin steels sheets is resistance spot welding (RSW). Some standardized and not standardized formulas predict the minimal shear tension strength (STS) of RSWed joints, but those formulas are less and less accurate with the higher base materials strength. Therefore, in our current research, we investigated a significant amount of STS data of the professional literature and our own experiments and recommended a new formula to predict the STS of RSWed high strength steel joints. The proposed correlation gives a better prediction than the other formulas, not only in the ultra-high strength steel range but also in the lower steel strength domain.

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