Hot-rolled steel strip for cold drawing and production method thereof

Abstract

The invention belongs to the technical field of hot continuous rolling steel strips, and discloses a hot-rolled steel strip for cold drawing and a production method. The method comprises the following steps: a casting blank is obtained through a full tri-stripping process, a ladle refining furnace LF refining process, an RH refining process and slab skin continuous casting in sequence; the thickness of the casting blank is 230-240 mm; the casting blank is heated; the heating temperature is 1190-1250 DEG C, and the soaking time is longer than and equal to 30 min; the heated casting blank is roughly rolled, wherein the rolling ending temperature of the final pass of rough rolling is 960-1060 DEG C, the rolling reduction is controlled within 19-22% and the thickness of an intermediate slab is controlled within 35-40 mm; the rough-rolled casting blank is finely rolled, wherein the final rolling temperature of fine rolling is controlled within 800-860 DEG C, and the thickness of the rolled steel strip is 6-10 mm; laminar cooling is performed on the fine-rolled casting blank; and the laminar-cooled casting blank is rolled as the hot continuous rolling steel strip, wherein the rolling temperature is 580-660 DEG C. The invention provides the hot-rolled steel strip for cold drawing with excellent performance and the production method.

Description

technical field [0001] The invention relates to the technical field of hot continuous rolling steel strips, in particular to a hot rolling steel strip for cold drawing and a production method thereof. Background technique [0002] Most of the cold-drawn steel pipes use seamless steel pipes, which have the following advantages: (1) precise size and small tolerance; (2) when the die hole is well processed and well lubricated, the surface quality of the steel pipe is good, and the finish can reach seven grades; (3) it can Use it to produce steel pipes with small diameters and special cross-sections; (4) Because cold working is helpful for the grain refinement of metals, and with the corresponding heat treatment system, steel pipes with good comprehensive mechanical properties can be obtained; (5) The equipment is simple and the production The method is flexible and the variety is convenient to replace. [0003] However, seamless steel pipes need to be heat-treated and directly...

AI Technical Summary

Problems solved by technology

[0003] However, seamless steel pipes need to be heat-treated and directly hot-rolled, and the price is relatively high. At the same time, seamless steel pipes also have the following problems. Scar, concave, convex hull, etc.