DE1929289B1 - Manganese steel alloy - Google Patents

Description

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The invention relates to an alloy made from an alloy that forms a manganese material core

containing steel for producing a hardened, ins- contains:

special case-hardened product with a q q · ^ ^ q 04 ° / C

tough material core and one with carbon an- ^ S to 6 ° / Mn '

enriched surface layer. 5 q '^ ^ - 20 / si'

Manganese-containing alloys are everywhere ^ _to q ₂ ο ° / / j

used where the products made from them _{0 01 to} ' _o j ° _{0 /} ^ b and / or V,

a particularly high mechanical stress ^ j ₈ to 0 03 ° / N and

subject and therefore a very high loadability- ^ j _{8 to} 02 ° / Zr

must show. Also, in such a LE 10 _wofeei ^ _d ° _{ene; Esüichen AjstäL represents}
The requirement that, when a surface layer is enriched with carbon, the hardness of the material core and that at least one hardened surface layer should be fully retained. consists of the same alloy, but a larger one. The alloys known up to now are sufficient to have this carbon content. Such an alloy will not adequately meet requirements that are or should be met at the same time as possible for the manufacture of case-hardened products. Objects used such as B. of profile iron,

Manganese steels are already known which contain 0.05 to rods, tubes, gears, masonry drill-in 2.0% carbon and 2 to 6% manganese. Sentences and the like that must have a hard, abrasion-resistant surface in order to improve the mechanical layer and a tough material core. Properties of these steels Proportions from 0.1 to 1% Si-20 The carbon content of the alloy is relatively low, licium, 0.1 to 1% copper, 0.1 to 1.5% nickel, 0.1 to whereas the surface layer as a result a particular-1 ° / o chromium, 0.05 to 0.5% vanadium, 0.05 to 0.5% of their concentration particularly high carbon ä molybdenum, 0.05 to 0.5% titanium and 0.05 contains up to 0.5% zirconia. Add as needed after enrichment with carbon ™ konium. hardening can then be carried out on the material.

Regardless of the additives chosen, 25 With the exception of the carbon content, however, is

each of these steels have a relatively large composition of the surface layer the same as

Carbon content, what for use as a work- that of the material core.

Material for a tough material core, which has a surface layer enriched with carbon The core material not enriched with carbon material has a very fine grain and is said to be exceptionally disadvantageous. The good strength properties with such an alloy 30. Due to differently manufactured products, there is no elongation and choice of manganese content, the yield point and impact strength properties can meet the increased strength according to the respective requirements. If one wants to change these properties within wide limits. The flow rate, so it is necessary to subject these steels to a limit between 60 and 100 kg / last heat treatment, namely 35 mm ² . The material is very hard, and its transition to annealing Such heat up temperature is at 500-685 ⁰ C. in the impact test, however, mung eliminates the hardness of the surface layer. even at maximum strength lower than -4O ⁰ C.

There are also steels known which herderem with a steel alloy according to the invention Up to 0.1%, preferably 0.04 to 0.06% Coal objects or products are both because of lenstoff, 3.0 to 5.0, preferably 3.0 to 3.5% manganese 40 their properties as well as because of the lightness and 0.5 to 1.5%, preferably 0.8 to 1.0% silicon in their manufacture in the industrial sector very advantageously can. However, this is not a liability, which is particularly evident from the following around products with tough low carbon core and points emerges:, case-hardened surface layer, but this steel is used as the starting material, which is suitable for all ' previously known steels form the material for a 45 types of processing is very suitable, which makes the completely different type of items, namely lowering processing costs to a very small value, which are set by inserting into a solid chromie. Because of the carbon enrichment agent be diffusion chrome-plated. The secured surface layer is the devices or products

In order to obtain high strength and, at the same time, good toughness, very wear-resistant and of great durability, these steels must also have a heat resistance. Furthermore, the material core retains its toughness treatment. This heat treatment, even after the surface treatment has been enriched, which consists of a coating, is carried out with a layer of carbon. Because of the hard over half hour tempering at 500 ^° C. and the surface layer and the hardness of the material core are therefore the hardness of a case-hardened layer, the devices or products would also be of great impact and completely destroy. "- ■ 55 impact resistance, since the material is shock-absorbing

The invention has therefore set itself the task of having an effect. Because of the great hardness of the initial one's Creating alloy that is used to manufacture materials will increase the extent to which a heat treated products with sufficient mechanical loading such as B. a soldering process the dimensions of the claimability is appropriate; furthermore, that from a product or the device should be changed or reduced; A product made from such an alloy has a good loading 60 This in turn leads to a much more favorable machinability exhibit. It is also part of the load distribution in the area of the soldering point. About that would give the invention, the difficulties and disadvantages is the manufacture of products or devices to eliminate the prior art. cheaper compared to corresponding products

For an alloy of the type mentioned at the beginning or devices that are made from a

manganese-containing steel for making a hardened 65 written common steel.

Product with a tough material core and a steel alloy with particularly good properties

Shafts enriched with carbon surface layer results when the core of the material is formed

it is therefore proposed according to the invention that the steel alloy consists of the following components:

0.01 to 0.03% C, forging a compact can be produced. At-

2.5 to 5% Mn, then the pressed part receives the desired

0.7 to 1.5% Si, form by machining or by

0.01 to 0.1% Al, hot or cold pressing.

0.02 to 0.2% Nb and / or V, 5 An object or material manufactured to the extent

0.005 to 0.02% N and the core is then subsequently

up to 0.2% Zr, enriched with carbon where a

where Fe represents the remaining part. Surface hardness is desired. Inner and outer

Here, too, Nb can be completely or partially through Ta er areas of the material core can in the same way

sets his. The Al will advantageously be enriched with carbon in the form of an acidic acid. This

Solution added. Enrichment process is carried out in a known manner

Depending on the intended use, the steel can be guided, e.g. B. by adding coal dust,

However, the alloy also contains 3 to 5% Mn cyanide or carbon-containing gas. The strenght

to have. the surface layer enriched with carbon

The silicon content of the steel alloy should be in the * 5 can be between 0.1 and 2.5 mm, which of the

Range from 0.5 to 2%. With a smaller size depending on the product in question

Silicon content than 0.5% would be the enrichment with it. Usually for objects with small

Carbon slowly or non-uniformly in front of him ren dimensions chosen enrichment depths that at

walk. The silicon content is, however, and therefore should be the lower limit of this range or near it

it is in the range from 0.7 to 1.5%, for the process a ° the same; for machine parts with larger

the carbon enrichment of importance, since measurements against it are enrichment depths in the

- Silicon increases the activity of carbon, so close to the upper limit of the range mentioned

that the product or device is a uniform one.

with carbon-enriched surface layer inside In the enriched surface layer is the half a relatively short time. Above 25 carbon content 0.5 to 1.5%, preferably it is schussiges austenite, which is usually at a Koh- between 0.7 and 1.2% · As an example, a case fuel enrichment occurs, especially when it is mentioned high, in which the treatment of the steel manganese content, however, does not occur if silicon product is kept at a temperature of 6 hours proportions within the range given above before -900 ° C took place, the steel product being one with Kohhanden are. 30 received a carbon-enriched surface layer, the further the alloy should be 0.01 to 0.5%, preferably a thickness of 1 mm and a carbon content of 0.02 to 0.2% niobium and / or vanadium or about 0.9%.

hold, the niobium being replaced by tantalum. An alloy according to the invention is found advantageous can be. Normally, a content should be used as a material for objects in which 0.3% niobium or tantalum to achieve a good hardness of the material core even during the enrichment Solubility exist, and it should not contain more than the surface layer with carbon lead-0.3 % Vanadium, mainly for reasons of ben must and / or where a high wear economy, be contained in the alloy. strength is required, as z. B. with gears

A steel alloyed according to the invention is suitable or is the case with masonry drills.
especially for the shaping processing and allows 40 The method for the production of a product from a steel alloy according to the invention is easily machined by cutting tools. In the accompanying drawing, a diagram is shown in such a way that one produced from the alloy shows the machinability of a steel marked with the pressed steel part in the shape of the product, no shows, namely in the form of a comparison with a 45 surface layer made with carbon steel of the usual design, which is numbered 2541 and that a hardening of the product is marked here and is then subjected to the same milling test. In the simplest case, the hardening may have been. Steel No. 2736 contains 0.032% C, 1.15% immediately after enrichment with carbon pre-Si, 3.85% Mn, 0.070% Al, 0.13% Nb, and 0.015% N; and from a temperature this steel was subjected to a heat treatment that was a little below that temperature so that its yield point is 75 kg / sq.mm and at which the enrichment with carbon through its tensile strength is 93 kg /sq.mm lie while running. However, it can also be otherwise that its Brinell hardness is 330. The steel No. 2541 product or the device after the enrichment of the usual execution contains about the following process. Let it cool down, after which it then again parts up to: 0.35% C; 0.25% Si; 0.7% Mn; 1.4% Cr; 1.4% 55 heated to the hardening temperature and then hardened Ni; 0.2% Mo; this steel has become through a heat. The hardening can get a Brinell hardness of 270 in water, oil, air, a treatment. In a salt bath or the like. As the last of the diagram shown in the drawing, the operation belongs to the treatment of the product when milling the volume removed on the X-axis or the device in general tempering at a milling speed in cubic centimeters at the ⁶ ° low temperature. After completion of the heat Y-axis in meters per minute compared; To treat the product or device, milling results in a surface hardness of 55 to 65 Rocknet steel, which is suitable for high speeds, with the set cutting shaft.

depth 1 mm and the feed 0.1 mm and should z. B., including a steel alloy according to the critical value of Erfinein VBmas 0.7 mm adopted ⁶ 5-making is very suitable for a rock drill insert herwurde, will be provided, so a compact is first in the The shape of the steel can in various desired The shape of the drill is carried out in the manner described above. So z. B. produced by casting, rolling or benen manner, after which the corresponding

the inner and / or outer surface parts the enrichment of a surface layer with carbon is carried out. Subsequently, hard metal pieces are soldered onto the drill, whereby this operation is already part of the required heat treatment. During hard soldering, the drill is regularly partially heated ^{up to a temperature of approximately 1000 to 1200 ° C.} A type of heating that is often used is to heat the entire drill bit with an initial heating process down to a lower temperature such as e.g. B. 800 to 900 ⁰ C and then to heat the foremost part of the drill core up to the soldering temperature, after grooves, incisions or depressions were previously provided for the hard metal pieces there. However, another type of heat treatment can also be used.

With a steel alloy according to the invention, however, a gear wheel can also advantageously be produced which is given its shape in the manner already described above. When the gear body A machine or other final processing has been subjected to the teeth their surface is enriched with carbon; then the gear wheel is hardened and tempered heat-treated until the desired degree of hardness is reached.

Claims (11)

Patent claims: 1. Manganese-containing steel alloy for producing a hardened, in particular case-hardened Product with a tough material core and a surface layer enriched with carbon, characterized in that the alloy forming the core of the material has the following proportions contains: 0.01 to 0.04% C, 40 0.5 to 2.0% Si, up to 0.2% Al, 0.01 to 0.5% Nb and / or V, up to 0.03% N and up to 0.2% Zr, where Fe represents the remaining part. 2. Steel alloy according to claim 1, characterized in that the forming the material core Alloy contains the following proportions: 0.01 to 0.03% C, 2.5 to 5.0% Mn, 0.7 to 1.5% Si, 0.01 to 0.1% Al, 0.02 to 0.2% Nb and / or V, 0.005 to 0.02% N and up to 0.2% Zr, where Fe represents the remaining part. 3. Steel alloy according to claim 1, characterized in that the Nb components at least are partially replaced by Ta components. 4. Use of a steel alloy according to claim 1 as a material for producing a masonry drill, whose cut surfaces at least partially have a surface layer enriched with carbon to have. 5. Use of a steel alloy according to claim 1 as a material for producing a gear wheel, whose teeth have a carbon-enriched surface. 6. Use of a steel alloy according to claim 1 as a material for objects such. B. Gears or masonry drills, in which the hardness of the material core is also used in the enrichment of the Surface layer with carbon must be preserved. 7. Use of a steel alloy according to claim 1 as a material for objects such as. B. Gears or masonry bits that require high wear resistance. 8. A method for producing a product from a steel alloy according to claim 1, characterized in that that a steel compact made from the alloy is brought into the shape of the product is that then the enrichment of at least a part of the surface layer with Carbon is made and that this is followed by a hardening of the product. 9. The method according to claim 8, characterized in that the hardening takes place by tempering. 10. The method according to claim 8 or 9, characterized in that the shaping by machine Processing takes place. 11. The method according to claim 8 or 9, characterized in that the shaping by pressing he follows. 1 sheet of drawings