Opportunities and dangers of using residual elements ... - Jernkontoret

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Table 12 Influence of residuals on end-propertiesREF Steel type Restelement16 ULC-IF Sn (evenothers)3 High strength C-Mnsteels(Critical)content (%)OperationP, Sb, Sn Grain Temperingboundary slow cooling,segregation service (350 -550°C57 Sb Notch impactstrength57 As 0.045 Notch impactstrength57 Maraging steel Pb, P, S 0.005 / 0.01 / Notch impact0.014 strength57 Sn 0.04 Notch impactstrength7 ULC-Ti hot stripes Sn 0,011/ 0,049*10 Cu, As, F,Sn, S, An,Zn, PbProperty affectedProblemReduce drastically toughness of hotrolled steelsTemper embrittlementPromotes temper embrittlementPromotes temper embrittlement,decrease notch impact valuePromotes temper embrittlement,decrease notch impact valuePromotes temper embrittlement,decrease notch impact valuetoughnessdecreaseGrain boundary embrittlementCommentEmbrittlement due to grain boundarysegregationMn, Cr or Ni necessary to observe thephenomene. Mo can inhibit temperembrittlement if between 0.2-0.7%wt.Effect increase with C content.3 Thin sheet Sn Segregate to grain boundaries More pronounced with low C.51
Table 13 Influence of residual elements on processing and end-properties of flat products, from reference [2]Product Steel type Operation Residual element Content CommentLow carbon steel grades casting Mo, Cr0.05 OKNb, Ni0.1Hot rolling Sn, Mo, As, Cr Problem Sn>Mo>AsCr OKCold rolled and annealed sheets All but not Nb andBad for crystallografic textures and r-value.FlatTiTensile stress increase at 0.08 (inte så at 0.03)ULC, low strength Hot rolling Sn, Cu OKULC, high strength Hot rolling CuSn0.30.05Strenght +, elongation –Strenght -, elongation +Sn+Cu together Sn moderates Cu effectCold work Embrittlement with both Cu and Snweldability OK with Cu and Sn52
Page 1 and 2: D 819(IM-2006-124)Opportunities and
Page 3 and 4: Table of Contents1. Introduction ..
Page 5 and 6: Long products are manufactures usua
Page 7 and 8: The main sources of Pb (decreasing)
Page 9 and 10: Elements remaining in the molten st
Page 11 and 12: 4.4 Different modes of existence of
Page 13 and 14: Segregation of Cu at the surface ca
Page 15 and 16: Only few studies show the effect of
Page 17 and 18: Figure 9 The effect of copper conte
Page 19 and 20: Effect of the other residuals on co
Page 21 and 22: enriched phase at steel/scale inter
Page 23 and 24: 5.1.3 Direct Strip CastingDirect ne
Page 25 and 26: Depending on the steel composition
Page 27 and 28: 5.2 Cold working, Hardenability and
Page 29 and 30: 650°C x 10h before cold rolling. C
Page 31 and 32: a)b)4003500.25Cu4003500.25Cu300300S
Page 33 and 34: Figure 22 Critical cooling curves f
Page 35 and 36: segregations. 0.4% of Mo added supp
Page 37 and 38: A BFigure 24 A) Mechanical properti
Page 39 and 40: Reference [41] presents high streng
Page 41 and 42: 5.3 WeldingThe effects of residual
Page 43 and 44: 6. ConclusionAn overview of the pos
Page 45 and 46: 7. Summarizing tables, effects of r
Page 47: Table 11 Influence of residuals on
Page 51 and 52: 1. References1 Gartz R, Nylén M,
Page 53 and 54: 29 Shibata K, Seo S. J., Kaga M, Uc
Page 55 and 56: 56 Carlsson G, “Future trends and

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