Products Spotlight Vol.12 No - KOBELCO 神戸製鋼

1 1 KOBELCO welding Spotlight Increased efficiency in coal-fired power generationhas reduced that industry s consumption of fuels,thereby decreasing carbon dioxide emissions asso-ciated with global warming. In a related trend, highperformance steels have been developed to resistthe increased temperatures and pressures of steamin the boilers. W-enhanced 9-12Cr steels (such asASME P92 and P122) are now regarded as state-of-the-art high-Cr ferritic steels that are superior to9Cr-1Mo-V-Nb steel (typically ASME P91) increep rupture strength.

2 To accommodate this grade of steel, Kobe Steelhas developed CR-12S for shielded metal arcwelding and TG-S12 CRS for gas tungsten arcwelding. Tables 1 and 2 show the unique chemicalcompositions and excellent mechanical propertiesof these filler chemical compositions of CR-12S and TG-12 CRS are designed with the proper chromiumequivalent (Creq) so as to minimize the precipita-tion of delta ferrite in the martensitic matrix,thereby assuring sufficient impact toughness andcreep rupture strength.

3 Typical applications for these filler metals includeheaders and main steam pipes in supercritical pres-sure boilers and ultra-supercritical pressure boilerswhich operate at higher temperatures and pressuresas compared with conventional 1: Main steam pipes (left) and a header (right) in posi-tion connected with a bundle of tubes. (Source: MitsubishiHeavy Industries, Ltd. and National Institute of Materials Sci-ence, Japan)Table 1: Chemical compositions of CR-12S deposited metaland TG-S12 CRS wireTrade SamplingDeposited metalWirePolarityAC*11.

4 welding current: 160A; welding position: *22. welding current: 140A; welding position: *33. Creq = Cr+6Si+4Mo+ +11V+5Nb+ +8Ti 40C 2Mn 4Ni 2Co 30N Cu (mass%) 6&5 67* 6 &567* 6 &56 &5 66 KLQLQJ LQ WKH :HOGLQJ RI6 XSHU DQG 8 OWUD 6 XSHU&ULWLFDO 3 UHVVXUH %RLOHUVT able 2: Mechanical properties of CR-12S deposited metaland TG-S12 CRS weld metal at room temperature*1 Trade PolarityAC*2 DCEP* (MPa)*4648652686TS (MPa)*4768771790El (%)*4262523RA (%)*46468682vE (J) at 0 C*5406044 PWHT740 C 8h FC1. welding conditions in GTAW: Base metal: (F) SUS410J3 per the Thermal Power Technical Standard of Japan; Shielding gas: Ar.

5 2. welding current: 160A; Heat input: 12kJ/cm; Preheat & interpass temperature: 200-250 C; welding position: welding current: 140A; Heat input: 18kJ/cm; Preheat & interpass temperature: 200-250 C; welding position: Test specimen (JIS Z 3111, Type A2): , : Average for three specimens (JIS Z 3111 Type 4)2 KOBELCO welding Expecting a fruitful business recoveryafter overcoming the worldwide financial crisis Since Lehman Brothers, a US investment bank, went bankrupt in September lastyear, triggering a once-in-a-hundred-years global economic recession, the serious-ness of the slump has only continued to grow.

6 Japanese industry has not avoided eco-nomic hardship, with those enterprises dependent on exports being hit doubly hardfrom a decrease in sales as well as appreciation of the Japanese yen. Leading automo-bile and electronics manufacturers have announced that large losses are to be expectedas they settle their accounts at the end of the financial year. Even though the majorindustrialized countries agreed on measures to boost economies and stabilize finances,conditions worldwide have only worsened, with financial turmoil accelerating andstock prices falling everywhere.

7 In an environment such as this, Kobe Steel must also be prepared for a severe fiscalyear in 2009 and aim at securing the highest sales possible while also strengtheningKobelco s overseas foothold by fortifying the company's financial and business posi-tion. However, as necessity is the mother of invention, innovation may now be moreforthcoming during this period of adversity than in times of economic boom. We areaware that, in 2009, all employees must be crisis-conscious, work out new plans withoriginality and ingenuity and push innovation forward to build a basis for the com-pany's future prosperity and stronger business structure.

8 In newly emerging countries, many brand new enterprises have achieved No. 1 sta-tus within their particular arenas. These global challengers tend to have a characteris-tic business strategy that emphasizes at least one or two of the following points. 1) Achieving competitive cost performance2) Investing in human resources3) Penetrating deeply into target markets4) Adopting a pinpoint marketing strategy5) Being ambitious and swift when entering foreign markets6) Innovating with originality and ingenuity (Investing amply in research and devel-opment in order to supply innovative Products )7) Accepting market pluralism (Responding flexibly to differences in customers'needs and distribution structures)

9 The KOBELCO welding Company Group is also a global industry with nine footholdsoverseas, and we intend to formulate strategies that are tailored to fit the needs of themain industries in such fields as automobile manufacturing, shipbuilding or energydevelopment. The article in these pages on the welding of equipment related to powerboilers demonstrates our awareness that in China, India and Brazil there is steadydemand for improvement of infrastructure. The article promotes our only one in theworld product and provides technical support to our customers.

10 It is our sincere hope that we will overcome the present business difficulties andprosper together with our customers. We hope that you will extend your support andhelp us to further popularize the KOBELCO brand throughout the 6&5 6&5 67* 6 &567* 6 &56P1 Shining in the welding of super and ultra super criti-cal pressure boilersP3-7 Heat-resistant high-Cr ferritic steel welding consumables for boilersP9-10 Celebratingthe anniversaries ofTKW (40), KMWT (20)and KWS (30)%106'065&UHHS &UHHS5 XSWXUHP8 Creep rupture strength is essential for heat-resisting steels and filler metalsToshiyuki OkuzumiGeneral ManagerInternational Operations CompanyKobe Steel, welding Highlight Thermal electric power generated from fossil fuelssuch as coal and oil satisfies around 50% of theworld s total demand for electric energy.