DE3043439A1 - METHOD FOR PRODUCING A HIGHLY STRENGTH FORGED STEEL FORGED PART - Google Patents

Description

Our reference: K 2961
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Method of making a heavy-duty forging from steel

Forged components made of steel that are exposed to high mechanical loads, such as B. axle beams for motor vehicles are usually made of heat treatable steels, such. B. CK 45 »42 CrMo 4 or 4I Ox 4» sieved and then subjected to a tempering process in order to achieve the desired strength properties.

It is already known (magazine "Stahl und Eisen" 69th year, (1949) No. 9, April 28, page 296/297), components forged from quenched and tempered steels out of the forging heat, d. H. without her Keeping the forging temperature for a longer period of time, hardening by quenching in an aqueous solution. Hardening from the forge's heat out already means a substantial rationalization of the production of such components, but these must be with the known After hardening, the process can be tempered for about 1 1/2 hours at a temperature of about 660 ° C.

The invention is based on the task of producing heavy-duty Forged parts made of steel, in particular axle bodies

ORIGINAL INSPECTED

for motor vehicles, while maintaining their needed Simplify strength properties and reduce the overall effort.

This object is achieved according to the invention in that the forged part is forged from a steel with a carbon content between 0.05 and 0.25 $ and a manganese content between 1.0 and 2.0 % and is machined further after hardening without subsequent tempering.

In principle, a structural steel is used as the steel, but its carbon and manganese content is within certain limits Areas. Choosing this special recipe for the steel used is not only due to the portfall of heat-treatable steels, the material expenditure is reduced, but at the same time decisive procedural simplifications are made achieved because of the otherwise necessary loosening can be dispensed with without the component properties achieved thereby being worse than those of components that have been conventionally manufactured using quenched and tempered steels.

The omission of starting causes a noticeable energy saving due to the omission of the heating measures otherwise required as well as an overall reduction in manufacturing time. In addition, there is a significant simplification of the so-called handlings, d. H. the handling of the forged component, because this inter alia. after quenching in a • aqueous solution, e.g. B. in a water bath mixed with salt, or oil can not only be sent to an oven for tempering, but can be transported straight away for straightening. The effort for that Straightening itself is also made by the method according to the invention decreased.

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The carbon and manganese content required to achieve the desired component properties depends to a certain extent on the cross-section of the forged part. Purely for the axle beam of motor vehicles, Torteil has to choose a carbon content between 0.15 and 0.25% and a manganese content between 1.2 and 1.7 $.

The desired component properties can be achieved by choosing the appropriate carbon and manganese content Needs to be adjusted, with higher carbon contents A higher edge hardness and a higher manganese content result in a higher core strength of the forged component.

The method according to the invention also makes it possible as steel Continuous casting, preferably a rolled continuous casting, d. H. So to use a particularly economical steel.

The inventive method is particularly advantageous for the production of molded components such. B. axle beams of motor vehicles, to be used because with such components the otherwise usual material and energy requirements are high and the difficulties are comparatively large in terms of handling. Such components are often drop forged. In this case the Forged parts are manufactured in a one-piece process.

By complying with the proposed ranges for carbon and manganese content, d. H. due to the recipe of the steel, - although in the production on the otherwise usual tempering, d. H. tempering after hardening from the forging heat is dispensed with - equivalent component properties achieved as with conventionally manufactured parts made of heat-treated steels.

It goes without saying that the expression forging etc. not just classic forging, in which the workpiece, which has been heated to the required temperature, is hammered is to be understood, but also all more modern hot forming processes in which the deformation of the workpiece does not hit.

ORIGINAL INSPECTED

Claims (1)

043439 VOLESVv j-. GEKWE h Η. CURRENT LIABILITY 3180 Wolfsburg 1 Our symbols: Z 296I Ί "J i, a 1702pt-gn-kl I f ' NOV ₁ 1380 AISPEtJCEE 1. A method for producing a heavy-duty forged part made of steel, in particular an axle body for motor vehicles, which is hardened after forging from the forging heat in a liquid quenching medium, characterized in that the forged part is made of a steel with a carbon content between 0.05 and 0 , 25 % and a manganese content between 1.0 and 2.0 % and is machined after hardening without subsequent tempering. 2. The method according to claim 1, characterized in that a steel is used with a carbon content preferably between 0.15 and 0.25 % and a manganese content preferably between 1.2 and 1.7 % . 5. The method according to claim 1 ■ or 2, characterized in that the steel used is continuous cast, preferably rolled continuous cast. 4. The method according to any one of claims 1 to 3, characterized in that the forged part in the one-piece process is drop forged. ORIQINAL INSPECTED