Steel, and processing method for the production of higher-strength fracture-splittable machine components

A technology for machine parts and processing methods, applied in the field of brittle machine parts, can solve the problem of high resource consumption of alloying agents

Inactive Publication Date: 2009-09-23
GEORGSMARIENHUTTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of known material modification solutions is that current material modification solutions are highly resource-intensive for expensive and scarce alloying agents

Method used

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Examples

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Embodiment Construction

[0011] According to this embodiment, the invention relates to a steel for the manufacture of brittle parts in the automotive industry, having the following chemical composition in weight percent:

[0012] 0.4%≤C≤0.6%; 0.2%≤Si≤1.0%; 0.5%≤Mn≤1.5%;

[0013] 0%≤Cr≤1.0%; 0%≤Ni≤0.5%; 0%≤Mo≤0.2%;

[0014] 0%≤Nb≤0.05%; 0%≤V≤0.3%; 0%≤Al≤0.05%;

[0015] 0.005%≤N≤0.020%,

[0016] Among them, the remaining components are composed of iron and impurities caused by smelting.

[0017] Disadvantages of the old scheme?

[0018] Partially high alloying additional costs due to 0.29% V (in the case of 36MnVS4) (Legierungskostenzuschlag (LZ))

[0019] · Few options for steel quality according to the invention

[0020] Advantages of the new solution?

[0021] Lower alloying costs (only 0.14% V)

[0022] • The user is independent of the unique steel quality according to the invention.

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Abstract

The invention relates to a steel and a processing method for higher-strength fracture-splittable machine components that are composed of at least two fracture-splittable parts. Said steel and method are characterized in that the chemical composition of the steel (expressed in percent by weight) is as follows: C is between 0.40% and 0.60%; Si is between 0.20% and 1.00%; Mn is between 0.540% and 1.50%; Cr is between 0% and 1.00%; Ni is between 0% and 0.50%; Mo is between 0% and 0.20%; Nb is between 0% and 0.050%; V is between 0% and 0.30%; Al is between 0% and 0.05%; N is between 0.005% and 0.020%; the rest is composed of iron and smelting-related impurities and residual matter.

Description

technical field [0001] The present invention relates to a steel and process for making higher strength brittle machine parts. The material was developed, for example, for the manufacture of fractured connecting rods. Background technique [0002] The steel must be suitable for forging or other hot deformation. The predominantly pearlitic structure must be conditioned by forging heat with controlled cooling, which has a higher than 750N / mm 2 yield limit, 1000 to 1200N / mm 2 High tensile strength, elongation at break higher than 10% and reduction of area higher than 25%. Brittleness is particularly important. [0003] The desired properties can be adjusted in a targeted manner via the corresponding chemical composition to be adjusted by the precipitation of special carbides (niobium and vanadium carbides) and manganese sulphides. The pearlite structure is targeted during the production of prefabricated materials and during hot deformation during precision forging of compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12
CPCC22C38/46C22C38/02C22C38/06C22C38/48C22C38/04C22C38/001
Inventor R·迪得里希斯A·施蒂贝尔R·朗格
Owner GEORGSMARIENHUTTE
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