A method for treating molten cast iron includes, performing an inoculation treatment to the molten cast iron, with the use of an inoculant containing: 15 to 80 wt % Si; either 80 to 100 wt % purity La or 80 to 100 wt % purity Ce as RE; Ca; Al; and the balance Fe with inevitable impurities, by adding the inoculant to the molten cast iron such that: the addition amount of La or Ce relative to the molten cast iron is 0.001 to 0.009 wt %; the addition amount of Ca relative to the molten cast iron is 0.001 to 0.02 wt %; and the addition amount of Al relative to the molten cast iron is 0.001 to 0.02 wt %.

The invention discloses a high strength nodular cast iron pole and a preparation technology thereof. The preparation technology is characterized by comprising the following steps: (1) preparation before pole casting, to be specific, preparation of raw materials, smelting of iron, adding of alloying elements and nodulizing; (2) a pole casting procedure, to be specific, casting and inoculation treatment; and (3) heat treatment. The invention also provides the high strength nodular cast iron pole prepared by adopting the preparation technology, comprising multiple tower poles which are sequentially connected in an inserted manner, wherein each tower pole is a cone-frustum hollow column which has the conicity of 1000:11-26; the top end of the high strength nodular cast iron pole is equipped with a tower cap. The high strength nodular cast iron pole has the advantages of high bearing capacity, thin wall thickness, light weight, low manufacturing cost and the like.

The invention discloses a high strength nodular cast iron pole and a preparation technology thereof. The preparation technology is characterized by comprising the following steps: (1) preparation before pole casting, to be specific, preparation of raw materials, smelting of iron, adding of alloying elements and nodulizing; (2) a pole casting procedure, to be specific, casting and inoculation treatment; and (3) heat treatment. The invention also provides the high strength nodular cast iron pole prepared by adopting the preparation technology, comprising multiple tower poles which are sequentially connected in an inserted manner, wherein each tower pole is a cone-frustum hollow column which has the conicity of 1000:11-26; the top end of the high strength nodular cast iron pole is equipped with a tower cap. The high strength nodular cast iron pole has the advantages of high bearing capacity, thin wall thickness, light weight, low manufacturing cost and the like.

The present invention suppresses leakage of combustion gas from a contact surface. A cylinder head (20) is attached to a cylinder block. The surface (26) of the side of the cylinder head (20) that is attached to the cylinder block includes a first region (AH1) and a second region (AH2) that has higher hardness than the first region (AH1).

The present invention suppresses leakage of combustion gas from a contact surface. A cylinder head (20) is attached to a cylinder block. The surface (26) of the side of the cylinder head (20) that is attached to the cylinder block includes a first region (AH1) and a second region (AH2) that has higher hardness than the first region (AH1).

The disclosure relates to a friction brake body for a friction brake of a motor vehicle, in particular a brake disc, wherein the friction brake body comprises a base body made from gray cast iron, and at least one wear resistant layer formed at least in areas on the base body. The wear resistant layer is a laser alloyed or laser dispersed edge layer of the base body and comprises at least one additive.

The disclosure relates to a friction brake body for a friction brake of a motor vehicle, in particular a brake disc, wherein the friction brake body comprises a base body made from gray cast iron, and at least one wear resistant layer formed at least in areas on the base body. The wear resistant layer is a laser alloyed or laser dispersed edge layer of the base body and comprises at least one additive.

Provided is an iron-based amorphous alloy and a method of manufacturing the same. More particularly, provided is an high carbon iron-based amorphous alloy expressed by a general formula Fe.sub.C.sub.SiBxPyCrz, wherein , , , x, y and z are atomic % of iron (Fe), carbon (C), silicon (Si), boron (B), phosphorus (P), and chrome (Cr) respectively, wherein is expressed by =100(++x+y+z) atomic %, is expressed by 13.5 atomic %17.8 atomic %, is expressed by 0.30 atomic %1.50 atomic %, x is expressed by 0.1 atomic %x4.0 atomic %, y is expressed by 0.8 atomic %y7.7 atomic %, and z is expressed by 0.1 atomic %z3.0 atomic %.

Provided is an iron-based amorphous alloy and a method of manufacturing the same. More particularly, provided is an high carbon iron-based amorphous alloy expressed by a general formula Fe.sub.C.sub.SiBxPyCrz, wherein , , , x, y and z are atomic % of iron (Fe), carbon (C), silicon (Si), boron (B), phosphorus (P), and chrome (Cr) respectively, wherein is expressed by =100(++x+y+z) atomic %, is expressed by 13.5 atomic %17.8 atomic %, is expressed by 0.30 atomic %1.50 atomic %, x is expressed by 0.1 atomic %x4.0 atomic %, y is expressed by 0.8 atomic %y7.7 atomic %, and z is expressed by 0.1 atomic %z3.0 atomic %.

A centrifugal cast caliber roll for a hot rolling mill has excellent abrasion resistance, fatigue resistance, and slip resistance. The roll has a chemical composition containing, by mass %, C: 1.8% or more and 3.0% or less, Si: 0.2% or more and 1.0% or less, Mn: 0.2% or more and 1.5% or less, Cr: 5% or more and 9% or less, Mo: 4.0% or more and 7.0% or less, V: 4.0% or more and 7.0% or less, Nb: 0.5% or more and 2.0% or less, and the balance being Fe and inevitable impurities, in which the relationship 0.6(C0.24V0.13Nb)1.4 (where C, V, and Nb each denote the content (mass %) of the corresponding chemical element) is satisfied, and has a surface hardness of Hs 67 or higher and Hs 76 or lower in terms of shore hardness.