Production method of X80 pipeline steel strip with thickness of 6-10 mm

Abstract

The invention belongs to the technical field of metal material manufacturing, and particularly relates to a production method of an X80 pipeline steel strip with the thickness of 6-10 mm. The production method comprises the following steps: (1) smelting, (2) continuous casting, (3) casting blank heat transferring, (4) casting blank reheating, (5) rough rolling, (6) finish rolling, (7) laminar cooling and reeling, and (8) storing and sampling. The production method can save investment and reduce the occupied land area and energy consumption, and moreover has the advantages of thick and thin slab hot continuous rolling technologies.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and in particular relates to a production method of a 6-10mm X80 pipeline steel strip. Background technique [0002] Among the current production technologies of X80 pipeline steel strip, the most mature technology is the development and production of X80 grade pipeline steel strip using 2050-2300 traditional thick slab hot continuous rolling line. Thin slab continuous casting and rolling generally cannot produce X80 pipeline steel strip . In the current mature production technology (1) 200-250 mm thick slabs are used, which must be equipped with electromagnetic stirring, light reduction and other equipment to ensure the internal quality of the slab, otherwise there will be internal looseness, center segregation, etc., and the thickness of the slab The proportion of fine-grained areas on the surface of the direction is small, and the columnar crystals are well developed; (2...

AI Technical Summary

Problems solved by technology

[0002] Among the current production technologies of X80 pipeline steel strip, the most mature one is the development and production of X80 grade pipeline steel strip using 2050-2300 traditional thick slab hot rolling line technology, thin slab continuous casting and rolling generally cannot produce X80 pipeline steel strip

In the current mature production technology (1) 200-250 mm thick slabs are used, which must be equipped with electromagnetic stirring, light reduction and other equipment to ensure the internal quality of the slab, otherwise there will be internal looseness, center segregation, etc., and the thickness of the slab The proportion of fine-grained areas on the surface of the direction is small, and the columnar crystals are well developed; (2) The heat transfer rate of the slab is low and the energy consumption is high. When producing some high-quality products, the slab must be cooled slowly and finished; ( 3) The traditional thick slab hot rolling process can be divided into full continuous rolling process, 3 / 4 continuous rolling process and semi-continuous rolling process. At present, 3 / 4 continuous rolling and semi-continuous rolling process are the majority, and the number of rolling mills is large , long laminar flow cooling area, many process production links, large floor area and high energy consumption, so the production cost is relatively high; (4) The hot continuous rolling finishing mill has a large width, strong design capability requirements, and large investment. The production of X80 The width of the hot continuous rolling and finishing rolling units in the country is mostly more than 2000mm, and the thick slab is rolled into a product through multi-pass rolling. The compression ratio of the cast slab is large and the production capacity is high; In the production of X80 pipeline steel strip, seven-stand finishing mills are generally used for continuous rolling, and the cooling rate is 15-20°C / s

Images