摘要:
A method to prevent corrosion of a susceptible article of a two-article system, in which first and second articles of the two-article system have surfaces facing one another and in which the two articles have different anodic indices includes applying a coating material to the surface of the first article and curing the coating material on the surface of the first article. The method further includes contacting and securing the surface of the first article with the surface of the second article. The two articles exhibit substantially no corrosion following exposure to a corrosive environment under standard GMW 17026 for a 15 year simulated test.
摘要:
Steel for a high-strength bolt contains: from 0.50 mass% to 0.65 mass% carbon, from 1.5 mass% to 2.5mass% silicon, 1.0 mass% or more chromium, 0.4 mass% or less manganese, greater than 1.5 mass% molybdenum, 0.03 mass% or less phosphorus and sulfur combined, and balance iron and inevitable impurities. A high-strength bolt is formed using steel for a high-strength bolt that contains: from 0.50 mass% to 0.65 mass% carbon, from 1.5 mass% to 2.5mass% silicon, 1.0 mass% or more chromium, 0.4 mass% or less manganese, greater than 1.5 mass% molybdenum, 0.03 mass% or less phosphorus and sulfur combined, and balance iron and inevitable impurities.
摘要:
Provided are a high-strength bolt having a tensile strength of 1,000 to 1,400 MPa and exhibits the same level of the delayed fracture resistance as that of the standard alloy steel even when omitting or reducing Mo and Cr from the SCM steel and the SCr steel, a steel wire for bolts used to manufacture such a high-strength bolt, and useful methods for manufacturing them. The steel wire for bolts in the present invention satisfies the predetermined chemical composition. When a rate of a B content at D 0 /4 part in the steel wire for bolts is 100% where D 0 is a diameter of the steel wire for bolts, a ratio of a B content at a surface of the steel wire for bolts is 75% or less on average, and a difference between a maximum value and a minimum value of the ratio is 25% or less. A prior austenite crystal grain size number in a region from the surface to a depth of 100 µm of the steel wire for bolts is No. 8 or more.
摘要:
A method of providing a threaded fastener with a multi-layered coating comprises the step of using a vapour deposition process to apply a multi-layered coating to a threaded portion of the threaded fastener, each layer of the multi-layered coating being formed from a coating material selected from the group comprising titanium, chromium, nickel, platinum, tantalum, and combinations thereof.
摘要:
Provided are a high-strength bolt having a tensile strength of 1,000 to 1,400 MPa and exhibits the same level of the delayed fracture resistance as that of the standard alloy steel even when omitting or reducing Mo and Cr from the SCM steel and the SCr steel, a steel wire for bolts used to manufacture such a high-strength bolt, and useful methods for manufacturing them. The steel wire for bolts in the present invention satisfies the predetermined chemical composition. When a rate of a B content at D 0 /4 part in the steel wire for bolts is 100% where D 0 is a diameter of the steel wire for bolts, a ratio of a B content at a surface of the steel wire for bolts is 75% or less on average, and a difference between a maximum value and a minimum value of the ratio is 25% or less. A prior austenite crystal grain size number in a region from the surface to a depth of 100 µm of the steel wire for bolts is No. 8 or more.
摘要:
Die Erfindung betrifft eine selbstschneidende Schraube, vorzugsweise Betonschraube, mit einem Kopf und einem Schaft, wobei der Schaft einen Gewindeabschnitt, der zumindest eine Gewindewendel trägt, einen gewindefreien Halsabschnitt und einen Übergangsabschnitt aufweist, der zwischen dem Gewindeabschnitt und dem Halsabschnitt angeordnet ist und in dem der Durchmesser des Schafts vom Gewindeabschnitt zum Halsabschnitt hin zunimmt, und wobei der Schaft im Gewindeabschnitt eine umwandlungsgehärtete Randschicht aufweist, welche lediglich einen Teil der Schraube bedeckt. Erfindungsgemäss ist vorgesehen, dass sich die umwandlungsgehärtete Randschicht in den Übergangsabschnitt hinein erstreckt.
摘要:
Fasteners are inserted into a stack of members and terminated with parts having at least one of a dry dielectric coating and a dry dielectric seal at select locations to protect against electromagnetic effects (EME).