Thermomechanically Hot Rolled High and Ultra High Strength Steel Grades - Processing, Properties and Application

Klein, Martin J.; Spindler, Helmut; Luger, A.; Rauch, Rudolf; Stiaszny, Peter; Eigelsberger, M.

doi:10.4028/www.scientific.net/msf.500-501.543

Cited by 31 publications

(27 citation statements)

References 4 publications

(3 reference statements)

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“…za konstrukcije mašina i kranova, industriji automobile i kamiona, cevovodima, građevinarstvu i brodogradnji. [1,2,3]. Ovi tipovi čelika su mikrolegirani sa Ti, Nb i V a proizvode se termomehanički kontrolisanim procesom (TMPC).…”

Section: Uvodunclassified

“…for construction machines and cranes, automotive and truck industry, pipelines, construction engineeringand shipbuilding. [1,2,3]. These types of steel are microalloyed with Ti, Nb and V and are produced by a thermomechanical controlled process (TMPC).…”

Section: Introductionmentioning

confidence: 99%

“…To enable such outstanding and in some degree contradictory properties it is necessary to optimize the contributions of the basic strengthening mechanisms [1,2]: solid solution strengthening by substitutional and interstitial elements like Mn, Si, C or N grain refinement precipitation strengthening transformation strengthening dislocation strengthening…”

mentioning

confidence: 99%

“…[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] especially in sense of reduced preheating requirements and reduced susceptibility to cold cracking [1,2,4].…”

mentioning

confidence: 99%

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Influence of the soft zone on the strength of welded modern HSLA steels

Hochhauser¹,

Ernst²,

Rauch³

et al. 2015

Zavarivanje i zavarene konstrukcije

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This study investigates the influence of softening in the heat affected zone of welds and the constraint effect on the transverse tensile strength of amicroalloyed,thermomechanicallycontrolled processed (TMCP) high strength steel grade. The welding was performed by MAG-Puls with three different levels ofenergy input to establish soft zones with varied extensions. Furthermore the thickness of the samples was reduced by milling to investigate the constraint effect at increased ratios of width of the soft zone to thickness on the transverse tensile strength of the welds. Although this modern steel is based on different conceptsand shows significantly different behaviour, (also with respect to weldability), in comparison to with classical quenched and tempered (QT) steels, it was found in this work that the established criteriafor the restriction of the soft zone width still can be applied. APSTRAKTU ovoj studiji se istražuje uticaj omekšavanja u zoni uticaja toplote zavarenog spoja i efekta ograničenja na poprečnu zateznu čvrstoću, mikrolegiranih, termomehanički kontrolisanim postupcima obrađenih (TMCP) čelika povišene črstoće. Zavarivanje je sprovedeno pomoću MAG/MIG impulsnog postupka sa tri različita nivoa unosa energije kako bi se stvorile meke zone sa različitim izduženjima. Šta više, debljina uzoraka je smanjena glodanjem da bi se istražio efekat ograničenja pri rastućem odnosu širine meke zone i debljine, na poprečnu zateznu čvrstoću zavarenog spoja. Mada su ovi moderni čelici zasnovani na različitim konceptima i pokazuju značajno različito ponašanje (takođe i vezano za zavarljivost) u poređenju sa klasičnim kaljenim i otpuštenim (QT) čelicima, ustanovljeno je da se uspostavljeni kriterijumi za ograničenje širine meke zone još uvek mogu primeniti.

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Section: Uvodunclassified

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

“…[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] especially in sense of reduced preheating requirements and reduced susceptibility to cold cracking [1,2,4].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Influence of the soft zone on the strength of welded modern HSLA steels

Hochhauser¹,

Ernst²,

Rauch³

et al. 2015

Zavarivanje i zavarene konstrukcije

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“…In this way, yield strengths of 800-1 000 MPa are readily reached for carbon contents of 0.04-0.08%. [1][2][3][4], * 2 The usefulness of bainite for producing high strength plate steels is well established but its application to hot strip steels with yield strength above 600 MPa is not so obvious. When bainite is formed during cooling to the coiling temperature or in the coil, it is expected to recover and soften significantly during the prolonged holding at elevated temperatures after coiling.…”

Section: Introductionmentioning

confidence: 99%

Vanadium Microalloyed Bainitic Hot Strip Steels

et al. 2010

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The aim of the present study was to investigate the possibilities of reaching yield strengths beyond 600 MPa for low carbon bainitic hot strip steels by vanadium microalloying together with suitable base alloying. The processing conditions and levels of carbon and nitrogen chosen in this laboratory investigation correspond to those of a typical 8 mm hot strip steel containing 0.04 mass% carbon and 0.010 mass% nitrogen from electric arc furnace practice processed in conventional or compact strip mills. It was found that a base alloying corresponding to 1.4 mass% Mn, 1.0 mass% Cr and 0.25 mass% Mo is required to form a fully bainitic structure after coiling at 400°C. The decisive factors determining the strength of bainitic hot strip steels are firstly the bainite transformation temperature and secondly the extent to which recovery of the densely dislocated bainitic ferrite can be prevented. The results of this study demonstrate that vanadium microalloying effectively prevents the recovery of the bainitic ferrite and leads to retention of the strength of the virgin bainite after coiling. This is primarily due to retardation of recovery by fine vanadium carbonitrides precipitates on dislocations and only to a lesser extent to true precipitation strengthening. With 0.08 mass% V together with 0.010-0.020 mass% N the yield strength lies in the range of 750-790 MPa compared to 680 MPa for a similar reference steel without vanadium. By raising the chromium content to 2 %, yield strengths in the range of 840-880 MPa have been reached. This is attributed to a lowering of the bainite transformation temperature resulting from the higher base alloying.KEY WORDS: high strength steel; bainite; alloying; hot rolling; cooling; microstructure; mechanical properties.* 1 This paper is dedicated to Michael Korchynsky, who recently retired from Stratcor Inc. after 60 years service to steel and vanadium microalloying. The authors of this paper, as well as former colleagues in Stockholm, are indebted to him for his profound engagement in our research and for countless rewarding discussions over the years. * 2 All steel compositions in this paper are expressed in mass%. Alloy Design and Experimental SteelsOut of the normal alloying elements, manganese, molybdenum and chromium are the most effective for raising the hardenability of steel, defined as their ability to prevent formation of ferrite and pearlite during hardening. Their hardenabilities expressed as the Grossman coefficient 6) are all high but decline somewhat in the order Mn, Mo and Cr, viz. 4.10, 3.14 and 2.83. In the present case, the retardation of bainite formation is particularly significant. Here, the coefficient differs more between these three elements, Mn 4.10, Cr 1.16 and Mo 0. 7) Hence, to stimulate bainite formation and at the same time prevent formation of ferrite/pearlite, molybdenum is most effective, followed by Cr and then Mn. In accordance with this, 1.4% Mn, 1.0% Cr and 0.25% Mo were chosen as the standard composition to create an adequate base hardenabilit...

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