摘要:
A heat-treatment oil composition contains (A) at least one of a hydroxy fused fatty acid having a polymerization degree of 2 or more and a derivative of the hydroxy fused fatty acid. The heat-treatment composition may also contain (B) at least one of a mineral oil and a synthetic oil.
摘要:
Disclosing herein is a method for manufacturing nickel-titanium compositions. The method includes disposing a powdered composition in a mold; the powdered composition comprising nickel and titanium; the titanium being present in an amount of about 38 to about 42 wt % and the nickel being present in an amount of about 58 to about 62 wt %; sintering the powdered composition to produce a sintered preform; compacting the preform; machining the preform to form an article; heat treating the article; the annealing being conducted at a temperature of about 1650° F. to about 1900° F. at a pressure of about 3 Torr to about 5 Kg−f/cm2 for a time period of about 10 minutes to about 5 hours; and quenching the article.
摘要:
A method of manufacturing a hydraulic hammer using a male gauge and a female gauge is provided wherein the hammer comprises a body and a chuck housing that are connectable by cooperatively formed thread fittings. A cooperatively threaded male gauge and female gauge can be used to form the threads on the body and the chuck housing and to determine the rotational orientation of the body and the chuck housing relative to one another. One of the gauges can be used to measure distortion of the chuck housing caused by heat treatment subsequent to the formation of the thread fitting and thereby to determine the required subsequent machining of the chuck housing necessary to retain the appropriate relative rotational orientation when the chuck housing is connected to the body. The method can comprise the steps of making and appropriately marking the male gauge and the female gauge.
摘要:
Methods, systems, and apparatus, including an apparatus that is a rail anchor comprising a head, a tail, and a belly section. The belly section comprises a top surface, a bottom surface, and two side surfaces. Each side surface comprises a contact-bearing surface area. The head comprises a bend along a length of the head. The tail comprises a notch. Each contact-bearing surface area has a surface area of at least 3 square inches and is adapted to extend at least 1.5 inches downward from the top of a railroad track crosstie along a side of the railroad track crosstie.
摘要:
A method for treating high-strength, low-alloy steel includes controlling material responses, such as the crystal structure of the steel, through various processing steps. More specifically, the method includes cold treating the steel to achieve predictable increases in a minimum ultimate tensile strength or desired changes in the crystal structure of the steel. In one embodiment, cold treating the steel operates to controllably increase the minimum ultimate tensile strength of the steel within increasing a specified maximum ultimate tensile strength of the steel. Stated otherwise, cold treating the steel may reduce or narrow a minimum-to-maximum ultimate tensile strength range such that the minimum ultimate tensile strength is closer to the specified maximum ultimate tensile strength.
摘要:
A quenching oil for reduced pressure quenching which comprises a base oil having a kinematic viscosity at 40° C. of 40 mm2/s or more and a vapor blanket breaking agent; and a method for quenching wherein the quenching oil is used and quenching is carried out while adjusting the pressure on the surface of the oil. The method allows the achievement of cooling characteristics over a wide range from those conventionally achieved by a cold oil to those by a hot oil, by the use of a single quenching oil.
摘要:
A quenching oil composition for simultaneously hardening ferrous metals and imparting excellent cleanliness or brightness to the metal surface comprises a major portion of a mineral oil with high heat-exchange rate containing a minor proportion of an ashless mono(polyisobutenyl) succinimide.
摘要:
An improved quenching oil composition comprising a major amount of a quench oil of lubricating viscosity; a minor amount of at least one carbon linked poly-phenate metal compound sufficient to improve the anti-staining properties of the composition and at least one naphthyl amine sufficient to improve the resistance to oxidation of the composition. The compositions may also include a minor amount of at least one of certain diamine components to provide further improved oxidation resistance. An improved method for quenching is also disclosed.
摘要:
A DUCTIBLE, WELDABLE, HIGH-STRENGTH STEEL WIRE CONTAINING 0.12 TO 0.30% C, 0.30 TO 1.60% MN, AND 0.005 TO 0.003% B, BALANCE FE IS PRODUCED BY EMPLOYING COLD REDUCTIONS OF FROM ABOUT 1 TO 60%, AUSTENITIZING WITH THE RANGE A3 TO 1900*F., AND THEN QUENCHING IN OIL. THE PROCESSING VARIABLES EMPLOYED ARE BALANCED WITH THE COMPOSITION AND THE FINAL DIAMETER OF THE WIRE IN ACCORD WITH TWO EQUATIONS, TO ACHIEVE A SUPERIOR COMBINATION OF HIGH STRENGTH AND DUCTILITY.