Global Patent Index - EP 3309272 A4

EP 3309272 A4 20181024 - FREE-CUTTING STEEL

Title (en)

FREE-CUTTING STEEL

Title (de)

AUTOMATENSTAHL

Title (fr)

ACIER DE DÉCOLLETAGE

Publication

EP 3309272 A4 20181024 (EN)

Application

EP 16807549 A 20160609

Priority

  • JP 2015117795 A 20150610
  • JP 2016067188 W 20160609

Abstract (en)

[origin: EP3309272A1] A free-cutting steel is provided that is excellent in machinability (surface roughness, tool life, chip treatability) and rusting characteristics. The free-cutting steel of this invention has a chemical composition that contains, in mass%, C: 0.005 to 0.150%, Si: less than 0.010%, Mn: 1.02 to 2.00%, P: 0.010 to 0.200%, S: 0.350 to 0.600%, Pb: 0.010 to 0.100%, N: 0.004 to 0.015%, O: 0.0080 to 0.0250%, Al: 0 to 0.003%, one or more types of element selected from a group consisting of Ca, Mg and Zr: 0 to 0.0005% in total, and B: 0 to 0.0200%, with the balance being Fe and impurities, the chemical composition satisfying Formula (1): Mn / S ‰¥ 2.90 where, the content (mass%) of a corresponding element is substituted for each symbol of an element in Formula (1).

IPC 8 full level

C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/14 (2006.01); C22C 38/60 (2006.01)

CPC (source: EP)

C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01); C22C 38/60 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

EP 3309272 A1 20180418; EP 3309272 A4 20181024; JP 6489215 B2 20190327; JP WO2016199843 A1 20180412; TW 201708572 A 20170301; TW I609092 B 20171221; WO 2016199843 A1 20161215

DOCDB simple family (application)

EP 16807549 A 20160609; JP 2016067188 W 20160609; JP 2017523691 A 20160609; TW 105118421 A 20160613