The present disclosure discloses a tripod universal joint fairway heat treatment device. A magnetizer includes a middle induction area and two-end induction areas, wherein the middle induction area includes magnetic conductive sheets stacked together; and the two-end induction areas include magnetic conductive sheets and magnetic conductive insulation sheets crosswise stacked together. Controllable deformation of an inner cavity fairway of a tripod universal joint during intermediate frequency quenching is realized by changing an arrangement form of the magnetic conductive sheets in the magnetizer, thereby avoiding a condition that three pivot shafts and bearing rings cannot be installed due to excessive deformation at a fairway opening after quenching, and greatly improving a qualified rate of products and safety performance of the products during use.

The invention relates to use of selected materials in systems for heat treatment, various forms of such material, related systems and methods for determining such materials. In particular the invention relates to the use of a cover of analumina-chromium alloy material with a Cr content of more than 5 w % (percent by weight) for one or more parts within a system suited for heat treatment.

A multi-chamber heat treatment device according to the present disclosure in which heating chambers are disposed with an intermediate transport chamber interposed therebetween in a top view, and a treatment object is stored in a heating chamber via the intermediate transport chamber, wherein the multi-chamber heat treatment device includes a gas cooling chamber which cools the treatment object using a cooling gas; and a cooling gas circulation device which includes an gas inlet and a gas outlet.

A high-strength bolt is provided that has high strength and excellent hydrogen embrittlement resistance characteristics. A bolt according to this invention has a chemical composition consisting of, in mass %, C: 0.22 to 0.40%, Si: 0.10 to 1.50%, Mn: 0.20 to less than 0.40%, P: 0.020% or less, S: 0.020% or less, Cr: 0.70 to 1.45%, Al: 0.005 to 0.060%, Ti: 0.010 to 0.045%, B: 0.0003 to 0.0040%, N: 0.0015 to 0.0080% and O: 0.0020% or less, with a balance being Fe and impurities, and satisfying Formula (1) and Formula (2), and with the high-strength bolt having a tensile strength of 1000 to 1300 MPa.
0.50C+Si/10+Mn/5+5Cr/220.85(1)
Si/Mn>1.0(2) Where, a content (mass %) of a corresponding element is substituted for each symbol of an element in Formula (1) and Formula (2).

A microalloyed steel component according to an aspect of the present disclosure includes a structure composed of ferrite and pearlite. The microalloyed steel component includes a columnar structure including band-shaped pearlite layers extending in a longitudinal direction of the microalloyed steel component and having a width of 200 m or shorter, and a ferrite layer precipitated so as to extend in the longitudinal direction between the pearlite layers.

This disclosure is directed at methods for mechanical property improvement in a metallic alloy that has undergone one or more mechanical property losses as a consequence of forming an edge, such as in the formation of an internal hole or an external edge. Methods are disclosed that provide the ability to improve mechanical properties of metallic alloys that have been formed with one or more edges placed in the metallic alloy by a variety of methods which may otherwise serve as a limiting factor for industrial applications.

A galvannealed steel sheet ontainabel by a method including the provision of a specific steel sheet, a recrystallization annealing with specific heating, soaking and cooling sub-steps using an inert gas, a hot-dip galvanizing and an alloying treatment.

The present invention discloses a extra thick hot rolled H section steel and a production method therefor. The extra thick hot rolled H section steel contains, by mass, the following chemical components: 0.04-0.11% of C, 0.10-0.40% of Si, 0.40-1.00% of Mn, 0.40-1.00% of Cr, 0.10-0.40% of Cu, 0.020-0.060% of Nb, 0.040-0.100% of V, 0.010-0.025% of Ti, 0.010-0.030% of Al, 0.0060-0.0120% of N, not more than 0.015% of P, not more than 0.005% of S, not more than 0.0060% of O, and the balance Fe and trace residual elements, wherein 0.090%?Nb+V+Ti?0.170%, 6.5?(V+Ti)/N?10.5, and 0.30%?CEV?0.48%. The extra thick hot rolled H section steel has a flange thickness of 90 mm-150 mm, has excellent comprehensive mechanical properties, and can well meet the needs for heavy supporting structural parts of high-rise buildings, large squares, bridge structures, etc.

A conveyor furnace includes a muffle having an inlet opening and an outlet opening, with a heating device for heating a volume delimited by the muffle, and a closed conveyor belt manufactured at least partially from metal. The conveyor furnace includes another heating device which is arranged so that, during the operation of the conveyor furnace, the heating device heats a section of the conveyor belt extending outside of the muffle.

The invention relates cold work tool steel. The steel includes the following main components (in wt. %): C 2.2-2.4, Si 0.1-0.55, Mn 0.2-0.8, Cr 4.1-5.1, Mo 3.1-4.5, V 7.2-8.5, balance optional elements, iron and impurities.