Controlled rolling and cooling method for PSB830 fine rolled threaded steel

Abstract

The invention discloses a controlled rolling and cooling method for PSB830 fine rolled threaded steel. The controlled rolling and cooling method comprises the steps that (1) a PSB830 steel billet is heated and then is subjected to rough rolling, intermediate rolling and finish rolling in sequence; (2) the rolled PSB830 steel is subjected to through-water cooling through a first through-water cooling area, a second through-water cooling area, a third through-water cooling area, a fourth through-water cooling area and a fifth through-water cooling area in sequence; and (3) air cooling is conducted after tempering, the water pressure of cooling water in the first through-water cooling area is 0.7-1.1 MPa, the water pressure of the second through-water cooling area is 0.8-1.2 MPa, the water pressure of the third through-water cooling area is 1.0-1.4 MPa, the water pressure of the fourth through-water cooling area is 1.0-1.4 MPa, and the water pressure of the fifth through-water cooling area is 0.7-1.1 MPa. The effects that a surface layer quenching martensitic structure is effectively avoided, transformation of the structure type is achieved, and meanwhile, good uniformity of the surface layer and the core temperature is ensured are achieved.

Description

technical field

[0001] The invention relates to the field of steel rolling technology, in particular to a method for controlled rolling and controlled cooling of PSB830 finish-rolled rebar. Background technique

[0002] In the steel rolling process, the rolling and cooling processes have a very important impact on product performance and production costs. Controlled rolling and cooling can improve the mechanical properties of products, reduce production costs, save energy and protect the environment. For example, in the production process of alloy steel, controlled rolling and controlled cooling can obtain ultra-fine grains, and can greatly improve its mechanical properties; , Control the band structure, reduce oxidation, etc., and partially replace the heat treatment process to meet product performance requirements.

[0003] After traditional bar rolling, rapid cooling is often used to realize the waste heat treatment process, that is, the steel bar with the final rolling ...

Examples

Embodiment Construction

[0030] Specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0031] The present invention provides a method for controlled rolling and controlled cooling of PSB830 finish-rolled rebar, wherein the controlled rolling and controlled cooling method comprises:

[0032] 1) After heating the PSB830 steel billet, after rough rolling, middle rolling and finishing rolling, the rolled PSB830 steel is obtained;

[0033] 2) Pass the rolled PSB830 steel through the first water-through cooling zone, the second water-through cooling zone, the third water-through cooling zone, the fourth water-through cooling zone and the fifth water-through cooling zone for water-through cooling Finally, the PSB830 steel after cooling through water is obtained;

[0034] 3) Air-cooling the PSB830 ...

technical field

[0001] The invention relates to the field of steel rolling technology, in particular to a method for controlled rolling and controlled cooling of PSB830 finish-rolled rebar. Background technique

[0002] In the steel rolling process, the rolling and cooling processes have a very important impact on product performance and production costs. Controlled rolling and cooling can improve the mechanical properties of products, reduce production costs, save energy and protect the environment. For example, in the production process of alloy steel, controlled rolling and controlled cooling can obtain ultra-fine grains, and can greatly improve its mechanical properties; , Control the band structure, reduce oxidation, etc., and partially replace the heat treatment process to meet product performance requirements.

[0003] After traditional bar rolling, rapid cooling is often used to realize the waste heat treatment process, that is, the steel bar with the final rolling ...

Examples

Embodiment Construction

[0030] Specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0031] The present invention provides a method for controlled rolling and controlled cooling of PSB830 finish-rolled rebar, wherein the controlled rolling and controlled cooling method comprises:

[0032] 1) After heating the PSB830 steel billet, after rough rolling, middle rolling and finishing rolling, the rolled PSB830 steel is obtained;

[0033] 2) Pass the rolled PSB830 steel through the first water-through cooling zone, the second water-through cooling zone, the third water-through cooling zone, the fourth water-through cooling zone and the fifth water-through cooling zone for water-through cooling Finally, the PSB830 steel after cooling through water is obtained;

[0034] 3) Air-cooling the PSB830 ...