EP 1378578 B1 20071107 - Free-cutting Ni-base heat-resistant alloy
Title (en)
Free-cutting Ni-base heat-resistant alloy
Title (de)
Hochtemperaturfeste Nickelbasislegierung mit guter Zerspannbarkeit
Title (fr)
Alliage de nickel résistant à des températures élevées facilement usinable
Publication
Application
Priority
EP 02253902 A 20020605
Abstract (en)
[origin: EP1378578A1] A free-cutting Ni-base heat-resistant alloy excellent in the high-temperature strength and corrosion resistance was proposed. The alloy contains Ni as a major component, 0.01 to 0.3 wt% of C and 14 to 35 wt% of Cr, and further contains at least one element selected from Ti, Zr and Hf in a total amount of 0.1 to 6 wt%, and S in an amount of 0.015 to 0.5 wt%. The alloy has dispersed in the matrix thereof a machinability improving compound phase, where such phase contains any one of Ti, Zr and Hf as a major constituent of the metal elements, essentially contains C and either S or Se as a binding component for such metal elements. The alloy also satisfies the relations of WTi + 0.53WZr + 0.27WHf > 2WC + 0.75WS and WC > 0.37WS, where WTi represents Ti content (wt%), WZr represents Zr content (wt%), WHf represents Hf content (wt%), WC represents C content (wt%) and WS represents S content (wt%). This successfully suppresses the amount of free S residing in the alloy, which results in an improved machinability while preventing the hot workability from being degraded.
IPC 8 full level
C22C 19/00 (2006.01); C22C 19/05 (2006.01)
CPC (source: EP)
C22C 19/053 (2013.01); C22C 19/055 (2013.01); C22C 19/056 (2013.01); C22C 19/058 (2013.01)
Designated contracting state (EPC)
DE FI FR GB IT SE
DOCDB simple family (publication)
EP 1378578 A1 20040107; EP 1378578 B1 20071107; DE 60223351 D1 20071220; DE 60223351 T2 20080828
DOCDB simple family (application)
EP 02253902 A 20020605; DE 60223351 T 20020605