Translation of "Nitriding steel" in German

It adopts 8 pieces nitriding steel, high durability.

In principle it is also possible to produce the proposed toothing carrier casing of highly quenched and subsequently drawn tempering or nitriding steel.

The nitriding of steel for the purpose of improving its mechanical properties has been known already for a long time.

The drill cutting part is made of abrasion-proof, ductile steel, for example an unalloyed or low-alloy tool steel, a high speed tool steel, a nitriding steel or another familiar tool steel possessing sufficient elasticity, skin hardness and toughness.

The ring traveler (10) as claimed in claim 8, wherein the basic material (21) of the core (20) is nitriding steel.

For effective wear protection adapted to the process, either nitriding steel or induction- hardened CrMo housing with an L/D relationship of 4, 8, 10, or 12 is used.

To ensure adequate and efficient wear protection for this type of process, housings made either of nitriding steel or induction hardened CrMo with an l/d ratio of 4, 8, 10, or 12 can be used.

Crankshafts are generally of unipartite form and are manufactured either in a casting process, in particular from spheroidal graphite iron, tempering steel or nitriding steel, or in a pressure forming process.

In such cases, according to a further refinement of the method of the invention, the annealing of the steel product would preferably be carried out such that additionally preoxidizing of the steel product, surface nitriding of the steel product, controlled dew point working, or combinations of these measures are carried out.

The particular sleeve, which forms the substrate for a hard material layer which may be used, or which is hardened, may also be made of rolling bearing steel or thermochemically treated case hardening steel (e.g., 16MnCr5), although tempering steel (e.g., 42CrMo4), full-hardened steel (e.g., 100Cr6) or nitriding steel may also be used.

In the dining and serving cutlery according to the invention, the configuration of the martensitic boundary layer is achieved by a heat treatment and a so-called “nitriding”. The nitriding of steel materials is known per se in the state of the art and is described for example in EP 0 652 300 A1 or also in DE 40 33 706.

Nitriding steel or induction hardened CrMo barrels with an L/D ratio of 4, 8, 10, or 12 are used to ensure reliable wear protection according to the requirements of specific application.

The nitriding of steel or steel alloys is effected with (gaseous) ammonia at temperatures in excess of about 500° C., preferably from about 500° to 800° C. Through the formation of iron nitride on the surface of the metal, a passivating effect with respect to the fluoro-chloro-hydrocarbons is attained.

Preferred materials for producing the screw elements are steels, in particular nitriding steels and special steels.

The camshafts are made from cast iron, nodular cast iron, tempered steel or nitrided steel.

The screw is made from nitrided and polished steel.

If nitrided steel forms the sliding material, the corresponding steel is preferably the substrate material.

Describing now the invention in greater detail, and in order to achieve the aforementioned objectives and others which will become more readily apparent from the disclosure to follow, the invention contemplates adding by means of an inert carrier gas and in powder form, into the steel melt in the ladle, prior to teeming into the continuous casting mold, the calcium or a compound thereof, at least one element forming a stable nitride at the steel melting temperature and boron or a boron compound.

The solution presently most employed is the use of nitrided steels, which render possible the application of a wear-inhibiting nitrided layer to the inner cylinder surface by means of the methods used therefor (bath nitriding, gas nitriding, ion nitriding).

The austenite grain coalescence is much more retarded in steels where the titanium has formed mainly nitrides than in steels in which it has preferential ly formed carbides (Fig. 39) (22) .

In the above-described experimental apparatus, the effect of nitrided carbon steel and Grade 4571 steel (prepared as under (b)) on the thermal decomposition of R 11 and R 113, was investigated.

For example, the following materials may be used: alloyed and unalloyed case hardened steels, nitride steels, sintered materials and cast irons.

Thereafter there is blown into the steel melt within the ladle, likewise by means of a carrier gas, preferably argon, at least one element which forms a stable nitride at the steel melt temperature.

Furthermore, it is known from Davis et al., ASM Handbook, Volume 4, Heating Treating 1991, AMS International US, to nitride also steels of the type AISI 430 and 460 in the low-temperature range up to at most 595° C.

In the case of the described hardening processes (nitriding and plasma-nitriding) for martensitic steels, the loss of corrosion-resistance is in addition very disadvantageous and hence precludes application entirely for the products according to the invention.

In the precision casting process, a large number of steels can be used, for example case hardened steels, tempering steels, nitrided steels, tool steels, high-speed steels, stainless and acid-resistant steels and also nonferrous metals.