Method for producing 8.8-grade high-strength fastener

A technology for manufacturing the high-strength (class 8.8) fastener includes such steps as providing non-annealing cold-forged steel rod, acid washing, phosphorizing, coating, drawing, cold-forging, quenching, tempering, and surface treating.

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Bibliographische Detailangaben
1. Verfasser:	SHIHUAI,YU SU
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CHEMISTRY COMBINED OPERATIONS FERROUS OR NON-FERROUS ALLOYS FORGE FURNACES FORGING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HAMMERING MACHINE TOOLS 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 METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS OTHER WORKING OF METAL PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS UNIVERSAL MACHINE TOOLS
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Beschreibung
Zusammenfassung:	A technology for manufacturing the high-strength (class 8.8) fastener includes such steps as providing non-annealing cold-forged steel rod, acid washing, phosphorizing, coating, drawing, cold-forging, quenching, tempering, and surface treating.