TW200927954A - Steel for producing machine components deformed in the solid state - Google Patents

Abstract

Steel and a manufacturing process to produce swaged machine components, in particular for vehicle construction, with a predominantly bainitic structure, characterised in that its chemical composition comprises the following contents in percentages by weight: 0. 10% ≤ C ≤ 0. 25% 0. 15% ≤ Si ≤ 0. 40% 1. 00% ≤ Mn ≤ 1. 50% 1. 00% ≤ Cr ≤ 2. 00% 0. 20% ≤ Ni ≤ 0. 40% 0. 05% ≤ Mo ≤ 0. 20% 0. 010% ≤ Nb ≤ 0. 040% 0. 05% ≤ V ≤ 0. 25% 0. 01% ≤ Al ≤ 0. 05% 0. 005% ≤ N ≤ 0. 025% 0% ≤ B ≤ 0. 0050% whereby the remainder comprises iron, elements arising from the smelting process and residues

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel and a manufacturing method for manufacturing a swaged mechanical component which is mainly used in vehicle construction, which mainly has a toughened structure. [Prior Art] M. ❹ [Summary of the Invention] According to the present invention, this object is achieved by a chemical composition comprising the following content in percentage by weight: 0.10% < C < 0.25% 0.15% < Si < 0.40 % 1.00% < Μη < 1.50% 1-00% < Cr < 2.00% 0.20% < Ni < 0.40% 0.05% <M〇< 0.20% 0.010% < Nb < 0.040% 0.05 % < V < 0.25% 0.01% < A1 < 0.05% 0-005% < N < 0.025% 0% < B < 0.0050% The remainder contains iron, elements derived from the smelting process and Residue. 6 200927954 [Embodiment] A particularly advantageous steel composition is given by item 2 of the scope of the patent application, namely: 0.10% < C < 0.20% 0.20% < Si < 0.30% 1.00% < Μη < 1.50% 1.50% < Cr < 2.00% 0.20% < Ni < 0.40% 0.05% < Mo < 0.20% 0.020% < Nb < 0.040% 0.05% < V < 0.20% 0.01% < A1 < 0.05% 0.005% < N < 0.025% The remainder includes iron, elements derived from the smelting process, and residues.

之一 One of the steels according to the invention is used for the manufacture of mechanical components, in particular for the construction of vehicles, in which components of this type have predominantly toughened structures and exclude certain carbonizations after drop hammer forging and accelerated controlled cooling. Matter and nitride. According to the fourth application of the patent application, the member manufactured in this manner exhibits a yield strength exceeding 620 N/mm2 after accelerated controlled cooling after heating from the deformation process. At the same time, the tensile strength according to item 5 of the patent application range is between 800 N/mm 2 and 11 〇〇 N/mm 2 after accelerated controlled cooling after heating from the deformation process. 7 200927954 Preferably, the yield point ratio is greater than 70% after accelerated controlled cooling from heating after the deformation process. According to Clause 7 of the scope of application, it is stipulated that the elongation at break is greater than 1〇0/〇 after accelerated controlled cooling after heating from the deformation process. According to Item 8 of the scope of application, it is stipulated that the profile shrinkage is greater than 4% after accelerated controlled cooling after heating from the deformation process. According to Item 9 of the scope of application, it is stipulated that the impact energy (DVMl notch) of the notch bar is greater than Μ J〇 after accelerated cooling from the deformation process, and according to the tenth item of the patent application, the value of the degree can be borrowed. It is adjusted by incremental cold heading, followed by a high cooling rate in the range of the toughening body and a holding stage or subsequent aging treatment. According to the scope of the patent application, the component is intended to be suitable for surface hardening and carburization. Finally, the mechanical negative of both the roll stock and the forged part before forging can be adjusted by thermomechanical treatment. [Simple diagram description] None [Main component symbol description] None 1 De @ _Research and career (Ge_ ASSQd coffee n fOT Materials R_h - Testing)

Claims (1)

200927954 X. Patent application garden: 1. A steel and manufacturing method for manufacturing a swaged mechanical component mainly used in vehicle construction mainly having a bainitic structure, characterized in that its chemical composition comprises the following weight percentage Content: 0.10% < C < 0.25% 0.15% < Si < 0.40% 1.00% < Μη < 1.50% 1.00% < Cr < 2.00% 0.20% < Ni < 0.40% 0.05 % < Mo < 0.20% 0.010% < Nb < 0.040% 0.05% < V < 0.25% 0.01% < A1 < 0.05% 0.005% < N < 0.025% 0% < B &lt 0.0050%, The rest include iron, elements derived from the smelting process, and residues. 2. The steel of claim 1, wherein the chemical composition comprises: 0.10% < c < 0.20% 0.20% < Si < 0.30% 1.00% < Mn < 1.50% 1.50% < Cr < 2.00% 0.20% < Ni < 0.40% 0.05% < Mo < 0.20% 9 200927954 0.020% < Nb < 0.040% 0.05% < V < 0.20% 0.01% < A1 <; 0.05% 0.005% < N < 0.025%, • The rest of which contains iron, elements derived from the smelting process and residues. • 3. The use of steel as claimed in item 2 of the patent application for the manufacture of mechanical components, in particular for the construction of vehicles, wherein the component has a toughening body after falling clock forging and accelerated controlled cooling. Structure and exclude certain carbon compounds and nitrides. • 4. The component of claim 3, characterized in that the yield strength exceeds 62〇N/mm2 ° after accelerated controlled cooling after heating from the deformation process. 5. The component of claim 4 It is characterized in that the tensile strength is between 8 〇〇N/mm 2 and 1100 N/mm 2 after accelerated controlled cooling after heating from the deformation process. ❹ 6. The member of claim 5, wherein the yield point ratio is greater than 7〇% after accelerated controlled cooling after heating from the deformation process. 7. The member of claim 6 of the patent application, characterized in that the elongation at break is greater than 丨 after accelerated controlled cooling after heating from the deformation process. 8. The member of claim 7, wherein the reduction in area is greater than 4% after accelerated controlled cooling from the deformation process. 9. The component of claim 8 of the patent application is characterized in that the impact energy (DVM gap) of the notch bar is greater than 25 J after accelerated controlled cooling after heating from the deformation process. 200927954 10. The component of claim 9 wherein the tenacity value is adjustable by incremental cooling followed by a high cooling rate and retention phase or subsequent aging treatment in the range of the toughening body. 11. The component of claim 3, which is characterized in that it is suitable for surface hardening and carburizing. Known 12. The component of claim 11 is characterized by a roll material before forging and a forged component Processing is adjusted. The mechanical properties of the component can be controlled by thermomechanical Schema: 11