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Control method for rough pitted surface on surface of 9Ni steel of single-rack steekle mill

A surface roughness, furnace coil mill technology, applied in the field of metallurgy, can solve the problems of single-stand furnace coil mill 9Ni steel surface roughness, pitting, etc., to reduce batch grinding and scrap change judgment, plate surface uniformity, and achieve stable control Effect

Inactive Publication Date: 2019-03-29
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0004] In order to solve the problem of surface roughness and pitting of 9Ni steel in a single-stand stove coil mill, the invention provides a rolling process for 9Ni steel in a single-stand stove coil mill

Method used

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  • Control method for rough pitted surface on surface of 9Ni steel of single-rack steekle mill
  • Control method for rough pitted surface on surface of 9Ni steel of single-rack steekle mill
  • Control method for rough pitted surface on surface of 9Ni steel of single-rack steekle mill

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Embodiment Construction

[0021] This embodiment selects billet size specifications 150*2290*8861mm and 150*2290*8843mm (billet thickness*width*length) to roll finished product thickness 46mm and 8mm X7Ni9 steel respectively, and the whole rolling process is as follows figure 1 As shown, the stable control of the surface quality of the 9Ni steel plate in the single-stand steckel mill is realized by optimizing the control of the heating temperature of the heating furnace, the time in the furnace, the descaling of the descaling box, the rolling schedule of the rolling mill and the descaling pass process. The specific optimization is as follows:

[0022] (1) Furnace heating

[0023] Reduce the heating temperature of the heating furnace and control the time of the billet in the furnace. 9Ni steel billets with a thickness of 150mm are intensively scheduled to ensure the same heating system. The distance between billets in the furnace is increased from 150mm to 200mm, and a space is reserved in front of the...

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Abstract

The invention discloses a control method for a rough pitted surface on the surface of 9Ni steel of a single-rack steekle mill. The manner of optimally controlling the heating temperature of a heatingfurnace, the in-furnace time, descaling of a descaling box, the rolling schedule of the mill and the descaling pass are adopted, stable control over the surface quality of a 9Ni steel plate of the single-rack steekle mill is achieved, the plate surface is uniform after shot blasting, and the defects of the rough pitted surface are effectively controlled; the surface quality of rolled pieces of thesingle-rack steekle mill is improved, and batched grinding and waste changing caused by the rough pitted surface problems to the 9Ni steel of the single-rack steekle mill are reduced; and the enterprise production efficiency, economic benefits and social image are improved.

Description

technical field [0001] The invention relates to a steel rolling process in the field of metallurgy, in particular to a steel rolling process for 9Ni steel in a single-stand furnace rolling mill. Background technique [0002] LNG is currently regarded as a clean energy with the most extensive application prospects. It usually needs to be stored in a low-temperature storage tank at minus 162 degrees Celsius and a pressure of about 0.1 MPa, transported by special ships or tank vehicles, and re-gasified when used. LNG carriers are internationally recognized high-tech, high-difficulty, and high-value-added "three-high" products, and are known as the "crown jewel" of the world's shipbuilding industry. One of the difficulties is that the production technology of 9Ni (9% nickel) steel plate, the main material of the LNG liquid tank, is extremely demanding and needs to be certified by the International Classification Society, so there are serious market barriers. In recent years, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74B21B45/04
CPCB21B37/74B21B45/04
Inventor 李睿鑫唐运章刘冰欧金雄许雄
Owner NANJING IRON & STEEL CO LTD
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