Method for controlling 16 Mn seamless steel tube blank heating

Abstract

The invention belongs to the technical field of metal working methods and discloses a method for controlling 16 Mn seamless steel tube blank heating to solve the problem that the performance index of a finished 16 Mn seamless steel tube product is low. The method for controlling 16 Mn seamless steel tube blank heating comprises the steps that an annular heating furnace is adopted for heating a 16 Mn seamless steel tube blank, and the heating process is sequentially divided into a preheating stage, a heating stage and a soaking stage, wherein the heating temperature at the preheating stage is smaller than or equal to 700 DEG C, the heating stage is divided into a low-temperature heating stage and a high-temperature heating stage, the heating temperature at the low-temperature heating stage is larger than or equal to 800 DEG C but smaller than or equal to 1,100 DEG C, the heating temperature at the high-temperature heating stage is larger than or equal to 1,050 DEG C but smaller than or equal to 1,290 DEG C, and the heating temperature at the soaking stage is larger than or equal to 1,260 DEG C but smaller than or equal to 1,300 DEG C. By means of the method, the defect that the yield strength performance index is low is completely eliminated, and the performance percent of pass reaches 100%. The method is suitable for heating of 16 Mn seamless steel tube blanks with various diameter specifications.

Description

technical field [0001] The invention specifically relates to a heating control method for a 16Mn seamless steel pipe billet, which belongs to the technical field of metal pressure processing methods. Background technique [0002] The 16Mn seamless steel tube blank needs to be heated to a suitable rolling temperature in a ring heating furnace before rolling, and then rolled into a tube. Due to the requirements of high yield strength and high impact toughness, the structural pipe has strict requirements on the uniformity of chemical composition and carbide in the billet. The structural state of the tube at room temperature is ferrite + cementite, and the heating process of the tube blank is actually a process of carbide diffusion and dissolution and austenite homogenization. The tube blank heating method plays a vital role in improving product performance. If the heating process is unreasonable and uniform austenite cannot be formed, performance indicators such as yield stre...

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Problems solved by technology

[0006] Therefore, the purpose of the present invention is to solve the problem of low performance index of finished 16Mn seamless steel pipe products, and to provide a method for controlling the heating of 16Mn seamless steel pipe billets. For heating, the heating process is divided into preheating section, heating section, and soaking section in turn. The heating temperature of the preheating section is less than or equal to 700°C. The heating section is divided into a low-temperature heating section and a high-temperature heating section. The heating temperature of the low-temperature heating section is greater than or equal to 800°C. Less than or equal to 1100°C, the heating temperature of the high-temperature heating section is greater than or equal to 1050°C and less than or equal to 1290°C, and the heating temperature of the soaking section is greater than or equal to 1260°C and less than or equal to 1300°C

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