EP 3480333 A1 20190508 - STEEL FOR MECHANICAL STRUCTURES
Title (en)
STEEL FOR MECHANICAL STRUCTURES
Title (de)
STAHL FÜR MECHANISCHE STRUKTUREN
Title (fr)
ACIER PUR STRUCTURES MÉCANIQUES
Publication
Application
Priority
- JP 2016132902 A 20160704
- JP 2017024442 W 20170704
Abstract (en)
A steel for machine structural use is provided which is excellent in machinability, rusting characteristics, and hot ductility. The steel for machine structural use according to the present embodiment has a chemical composition which consists of, in mass%, C: 0.30 to 0.80%, Si: 0.01 to 0.80%, Mn: 0.20 to 2.00%, P: 0.030% or less, S: 0.010 to 0.100%, Pb: 0.010 to 0.100%, Al: 0.010 to 0.050%, N: 0.015% or less and O: 0.0005 to 0.0030%, with the balance being Fe and impurities, the chemical composition satisfying Formula (1). The total number of specific inclusions included in the steel which are any of MnS inclusions, Pb inclusions and composite inclusions containing MnS and Pb and which have an equivalent circular diameter of 5 µm or more is 40 per mm 2 or more. Mn / S ‰¥ 8.0 Where, a 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); B22D 11/00 (2006.01); B22D 11/124 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
B22D 11/001 (2013.01 - EP US); B22D 11/124 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/08 (2013.01 - EP US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C22C 38/42 (2013.01 - KR); C22C 38/50 (2013.01 - KR); C22C 38/58 (2013.01 - KR); C22C 38/60 (2013.01 - EP KR US); C21D 8/065 (2013.01 - US); C21D 2211/004 (2013.01 - EP US)
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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3480333 A1 20190508; EP 3480333 A4 20191120; CN 109477174 A 20190315; JP 6760375 B2 20200923; JP WO2018008621 A1 20190516; KR 20190027848 A 20190315; US 2019233927 A1 20190801; WO 2018008621 A1 20180111
DOCDB simple family (application)
EP 17824224 A 20170704; CN 201780041492 A 20170704; JP 2017024442 W 20170704; JP 2018526388 A 20170704; KR 20197003389 A 20170704; US 201716313931 A 20170704