METAL PIPE AND STRUCTURAL MEMBER USING METAL PIPE
First Claim
1. A metal pipe comprising:
- a circular cross section with an outer diameter D and a length not less than 6D,the metal pipe further comprising;
a high-strength portion disposed along an entire circumference of the metal pipe to extend a dimension, as measured in a longitudinal direction of the metal pipe, that is not less than (2/3)D and not more than (4/3)D, the high-strength portion having a yield strength not less than 500 MPa; and
low-strength portions disposed along the entire circumference of the metal pipe to be arranged in the longitudinal direction of the metal pipe to sandwich the high-strength portion, the low-strength portions having a yield strength of 60 to 85% of that of the high-strength portion.
2 Assignments
0 Petitions
Accused Products
Abstract
A metal pipe has a circular cross section with an outer diameter D and a length not less than 6D. The metal pipe includes a high-strength portion (1A) and low-strength portions (1B). The high-strength portion (1A) is disposed along the entire circumference of the metal pipe to extend a dimension, as measured in the longitudinal direction of the metal pipe, that is not less than (2/3)D and not more than 3D of the metal pipe. The high-strength portion (1A) has a yield strength not less than 500 MPa (or a tensile strength not less than 980 MPa). The low-strength portions (1B) are disposed along the entire circumference of the metal pipe to be arranged in the longitudinal direction of the metal pipe to sandwich the high-strength portion (1A). The low-strength portions (1B) have a yield strength of 60 to 85% of that of the high-strength portion (1A).
1 Citation
11 Claims
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1. A metal pipe comprising:
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a circular cross section with an outer diameter D and a length not less than 6D, the metal pipe further comprising; a high-strength portion disposed along an entire circumference of the metal pipe to extend a dimension, as measured in a longitudinal direction of the metal pipe, that is not less than (2/3)D and not more than (4/3)D, the high-strength portion having a yield strength not less than 500 MPa; and low-strength portions disposed along the entire circumference of the metal pipe to be arranged in the longitudinal direction of the metal pipe to sandwich the high-strength portion, the low-strength portions having a yield strength of 60 to 85% of that of the high-strength portion. - View Dependent Claims (3, 4, 5)
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2. (canceled)
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6. A vehicle body, bumper or vehicle door comprising:
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a metal pipe having a circular cross section with an outer diameter D, the metal pipe further comprising; connections configured to be connected to another member, the connections being portions of the metal pipe located at two positions separated from each other by 6D or more in a longitudinal direction of the metal pipe; a high-strength portion disposed between the connections along an entire circumference of the metal pipe to extend a dimension, as measured in the longitudinal direction, that is not less than (2/3)D and not more than (4/3)D, the high-strength portion having a yield strength not less than 500 MPa; and low-strength portions disposed along the entire circumference of the metal pipe to be arranged in the longitudinal direction of the metal pipe to sandwich the high-strength portion, the low-strength portions having a yield strength of 60 to 85% of that of the high-strength portion. - View Dependent Claims (8, 9, 10, 11)
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7. (canceled)
Specification