Strip steel for high-tensile-strength of extension double-deck welded pipe and construction method of strip steel and double-deck welded pipe
A technology with high tensile strength and manufacturing method, applied in the field of welded pipes, can solve the problems of low steel strength and undisclosed issues
Active Publication Date: 2018-05-01
BAOSHAN IRON & STEEL CO LTD
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[0004] The strength of the currently disclosed steel for double-layer welded pipes is low. With the continuous thinning of strip steel materials, the requirements for the tensile strength of double-layer welded pipes are also increasing. However, for high-strength double-layer welded pipe steel strip technology never seen publicly
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[0059] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.
[0060] The chemical compositions of the strip steel examples and comparative examples of the present invention are shown in Table 1, and the balance is Fe and unavoidable impurities. Steel strips are obtained through converter steelmaking, continuous casting, hot rolling, pickling, cold rolling, continuous annealing, and tempering. Among them, the heating temperature in the hot rolling process is ≥1150°C, the final rolling temperature is ≥820°C, and the coiling temperature is 550~ 650°C, pickling to remove surface scale, then cold rolling, cold rolling reduction rate ≥ 85%, continuous annealing constant temperature section temperature is 570+10 5 *(C-0.06%)+10 4 *(Mn-0.20%)≤T≤680+5×10 4 *(C-0.06%), the constant temperature section is kept for 30-100s, and then the annealed plate is leveled with a flat rate of 0.5-1.5%, and finally a strip steel with a...
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The invention discloses a strip steel for high-tensile-strength of a double-deck welded pipe and a construction method of the strip steel and the double-deck welded pipe. The strip steel comprises, byweight, 0.06-0.12% of C, 0.20-0.60% of Mn, 0.005-0.015% of P, 0.02-0.06% of Al, the balance Fe and other inescapable impurity elements. According to the elements, the following relationship needs tobe satisfied simultaneously; 50C plus 10Mn plus 50P is no less than 8% and no more than 11.5%. The strength of extension of the strip steel is 420-480 MPa, and the extension rate is no less than 28%.The strength of extension of the double-deck welded pipe obtained though processing and tabulation is ensured between 420-480 Mpa, and the extension rate of the double-deck welded pipe reaches above 25%. Compared with an existing double-deck welded pipe, the double-deck welded pipe obtained is significantly improved in strength, and meanwhile, the bending and molding property of the welded pipe inusing can be ensured. The high strength thin gauge double-deck welded pipe can be used in an automobile braking oil pipe.
Description
technical field [0001] The invention belongs to the technical field of welded pipes, and in particular relates to a high-tensile-strength double-layer welded pipe steel strip, a manufacturing method thereof, and a double-layer welded pipe. Background technique [0002] Double-layer welded pipe, that is, double-layer welded pipe, also known as Bondi pipe, is generally made of strip steel after copper plating and 720° coil welding. Double-layer welded pipes are widely used in the fields of automobiles and household appliances due to their performances such as shock resistance, corrosion resistance, high cleanliness, and high precision. The automobile field mainly uses double-layer welded pipes as brake pipes, fuel pipes, and lubricating oil pipes, and the home appliance field mainly uses double-layer welded pipes as condensers in refrigerators and air conditioners. Among these applications, double-layer welded pipe for brakes has the most stringent performance requirements. ...
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Login to View More IPC IPC(8): C22C38/04C22C38/06C22C33/04C22C38/12C22C38/32C22C38/14C22C38/18C22C38/16
Inventor 连福亮梁高飞
Owner BAOSHAN IRON & STEEL CO LTD