HOT ROLLED STEEL BAR OR WIRE FOR COLD FORGING, AND MANUFACTURING METHOD OF STEEL WIRE FOR COLD FORGING

PROBLEM TO BE SOLVED: To provide a hot rolled steel bar or wire excellent in cold forgeability and a γ grain coarsening prevention property.SOLUTION: The hot rolled steel bar or wire includes by mass: 0.1-0.3% of C; 0.05-1.0% of Si; 0.4-2.0% of Mn; 0.003-0.05% of S; 0.5-3.0% of Cr; 0.010-0.025% of N...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	OFUJI YOSHIHIRO, SUENO HIDEKAZU
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CHEMISTRY FERROUS OR NON-FERROUS ALLOYS FORGE FURNACES FORGING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HAMMERING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a hot rolled steel bar or wire excellent in cold forgeability and a γ grain coarsening prevention property.SOLUTION: The hot rolled steel bar or wire includes by mass: 0.1-0.3% of C; 0.05-1.0% of Si; 0.4-2.0% of Mn; 0.003-0.05% of S; 0.5-3.0% of Cr; 0.010-0.025% of N; 0.02-0.05% of Al; and a remainder consisting of Fe and impurities, has a chemical composition in the impurities of P≤0.025%, Ti≤0.003%, and O≤0.002%, consists of a ferrite and bainitic structure or a ferrite, bainite, and pearlite structure, has a metal structure in which a bainite structural percentage>70%, and a ferrite average particle diameter≤40 μm, wherein the Al amount precipitated as AlN in a region from the surface of the steel bar or wire to 1/5 of the radius and a region from the center part to 1/5 of the radius is ≤0.010%, and the number density of AlN of the diameter≥100 nm is ≤5 piece/100 μm.