Method for producing a component from an air-hardenable steel and component produced therewith
First Claim
1. A method for producing components from an air-hardenable steel comprising the following elements (composition in mass-%):
- C≦
0.20Al≦
0.08Si≦
1.00Mn 1.20 to ≦
2.50P≦
0.020S≦
0.015N≦
0.0150Cr 0.30 to ≦
1.5Mo 0.10 to ≦
0.80Ti 0.010 to ≦
0.050V 0.03 to ≦
0.20B 0.0015 to ≦
0.0060remainder iron, including typical elements in steel production,the method comprising the steps of;
heating a hot-rolled or cold-rolled steel sheet blank or steel tube blank to a temperature of θ
blank=800 to 1050°
C.,transferring the hot steel blank to a forming tool, closing the forming tool,forming the hot-rolled or cold-rolled steel sheet blank or steel tube blank into a component in the closed forming tool for a duration of less than 5 sec, while simultaneously heating the forming tool to attain a cooling rate of the blank of at most 150 K/s,removing the formed component from the forming tool while the component has a temperature between 200°
C. and 800°
C., andcooling the formed component down in air after removal from the forming tool at a cooling rate less than the cooling rate in the forming tool,thereby hardening the component during cooldown in air to attain a minimum elongation of no less that 13% and a tensile strength between 800 MPa and 1200 MPa.
1 Assignment
0 Petitions
Accused Products
Abstract
A component of an air-hardenable steel composed of (contents in mass %): C<0.20; Al<0.08; Si<1.00; Mn 1.20 to <2.50; P<0.020; S<0.015; N<0.0150; Cr 0.30 to <1.5; Mo 0.10 to <0.80; Ti 0.010 to <0.050; V 0.03 to <0.20; B 0.0015 to <0.0060, with the remainder being iron including the usual elements present in steel, is produced by heating a hot- or cold-rolled steel sheet or steel tube section to a temperature of θblank=800 to 1050° C. and then forming the sheet or tube into a component in a forming tool. After removal from the tool, the component is cooled down in air while the component still has a temperature above θremoval=200° C. and below 800° C. The component achieves the required mechanical properties during air-cooling.
12 Citations
7 Claims
-
1. A method for producing components from an air-hardenable steel comprising the following elements (composition in mass-%):
-
C≦
0.20Al≦
0.08Si≦
1.00Mn 1.20 to ≦
2.50P≦
0.020S≦
0.015N≦
0.0150Cr 0.30 to ≦
1.5Mo 0.10 to ≦
0.80Ti 0.010 to ≦
0.050V 0.03 to ≦
0.20B 0.0015 to ≦
0.0060remainder iron, including typical elements in steel production, the method comprising the steps of; heating a hot-rolled or cold-rolled steel sheet blank or steel tube blank to a temperature of θ
blank=800 to 1050°
C.,transferring the hot steel blank to a forming tool, closing the forming tool, forming the hot-rolled or cold-rolled steel sheet blank or steel tube blank into a component in the closed forming tool for a duration of less than 5 sec, while simultaneously heating the forming tool to attain a cooling rate of the blank of at most 150 K/s, removing the formed component from the forming tool while the component has a temperature between 200°
C. and 800°
C., andcooling the formed component down in air after removal from the forming tool at a cooling rate less than the cooling rate in the forming tool, thereby hardening the component during cooldown in air to attain a minimum elongation of no less that 13% and a tensile strength between 800 MPa and 1200 MPa. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification