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A rolling temperature control method for eliminating red rust on the surface of hot-rolled coil weathering steel

A rolling temperature and control method technology, applied in the direction of temperature control, etc., can solve the problems affecting the surface quality of hot-rolled coil weathering steel, increasing production costs, and high alloy costs, so as to improve surface quality, eliminate red rust, and reduce production. cost effect

Active Publication Date: 2021-03-09
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the corrosion resistance of weathering steel, it is often necessary to add Si, Cu, P, Cr, Ni and other corrosion-resistant alloy elements to ensure its good corrosion resistance. In order to reduce the production cost, the Si content of the weathering steel is often increased to control the lower Cu, P, and Cr contents to meet the corrosion resistance. Due to the increase of the Si content, the surface of the low-cost hot-rolled weathering steel is easy to form strips or sheets. Shaped red rust affects the surface quality of hot-rolled weathering steel

Method used

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  • A rolling temperature control method for eliminating red rust on the surface of hot-rolled coil weathering steel
  • A rolling temperature control method for eliminating red rust on the surface of hot-rolled coil weathering steel
  • A rolling temperature control method for eliminating red rust on the surface of hot-rolled coil weathering steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The thickness of the hot-rolled coiled weathering steel in this embodiment is 2.0 mm, and its chemical composition and mass percentage are shown in Table 1.

[0024] In this embodiment, the slab thickness of the hot-rolled weather-resistant steel coil is 200 mm, and the rolling temperature control method for eliminating the red rust on the surface of the weather-resistant steel coil of the hot-rolled coil comprises the following steps:

[0025] (1) Heating temperature control: the slab is heated in the heating furnace, and the air-fuel ratio of the heating furnace is 3.5:1. The heating temperature of the first heating section is 1150°C; the heating temperature of the second heating section is 1297°C, the soaking temperature is 1300°C, and the furnace temperature is 1260°C; the total heating time in the furnace is 200 minutes;

[0026] (2) Temperature and thickness control of rough rolling intermediate billet: rough rolling can be rolled in 7 passes, the temperature of i...

Embodiment 2

[0031] The thickness of the hot-rolled coiled weathering steel in this embodiment is 6.0mm, and its chemical composition and mass percentage are shown in Table 1.

[0032] In this embodiment, the slab thickness of the hot-rolled weather-resistant steel coil is 200 mm, and the rolling temperature control method for eliminating the red rust on the surface of the weather-resistant steel coil of the hot-rolled coil comprises the following steps:

[0033] (1) Heating temperature control: the slab is heated in a heating furnace, and the air-fuel ratio of the heating furnace is 2.5:1. The heating temperature of the first heating section is 1120°C; the heating temperature of the second heating section is 1285°C, the soaking temperature is 1290°C, and the furnace temperature is 1250°C; the total heating time in the furnace is 165min;

[0034] (2) Temperature and thickness control of rough rolling intermediate billet: 7 passes of rough rolling, the temperature of intermediate billet at ...

Embodiment 3

[0039] The thickness of the hot-rolled coiled weathering steel in this embodiment is 7.8 mm, and its chemical composition and mass percentage are shown in Table 1.

[0040] In this embodiment, the slab thickness of the hot-rolled weather-resistant steel coil is 200 mm, and the rolling temperature control method for eliminating the red rust on the surface of the weather-resistant steel coil of the hot-rolled coil comprises the following steps:

[0041] (1) Heating temperature control: the slab is heated in a heating furnace, and the air-fuel ratio of the heating furnace is 3.0:1. The heating temperature of the first heating section is 1050°C; the heating temperature of the second heating section is 1261°C, the soaking temperature is 1263°C, and the furnace temperature is 1220°C; the total heating time in the furnace is 161min;

[0042] (2) Temperature and thickness control of rough rolling intermediate billet: 5 passes of rough rolling, the temperature of intermediate billet at...

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Abstract

The invention discloses a rolling temperature control method for eliminating red rust on the surface of hot-rolled coil weathering steel. The rolling temperature control method includes the following steps: (1) heating temperature control; (2) rough rolling intermediate billet temperature and Thickness control; (3) Finish rolling temperature control; (4) Coil temperature control. The slab thickness of the hot-rolled coiled weathering steel of the present invention is 200mm, and the thickness of the finished product is 2.0-14.0mm. The finished product is divided into 2.0≤t≤3.5mm, 3.5<t≤6.0mm, 6.0<t≤8.0mm, 8.0< t≤14.0mm, the four sections control the rolling temperature respectively, through reasonable control of the heating temperature, rough rolling intermediate billet temperature and thickness, final rolling temperature and coiling temperature, the rolling temperature can be optimized and the hot rolled coil with high Si content can be eliminated The red rust on the surface of the weathering steel of the plate improves the surface quality of the weathering steel of the hot-rolled coil.

Description

technical field [0001] The invention belongs to the technical field of rolling, and in particular relates to a rolling temperature control method for eliminating red rust on the surface of hot-rolled coil weathering steel. Background technique [0002] Weathering steel, that is, atmospheric corrosion-resistant steel, is a low-alloy high-strength steel with good corrosion resistance in the atmosphere. During use, the surface will gradually form a layer of dense and firmly adhered corrosion product protective film to prevent further corrosion of the substrate by oxygen, water and other corrosive media in the atmosphere, making its corrosion rate greatly lower than that of carbon steel, so it is widely used Used in railways, containers, bridges and marine engineering and other fields. [0003] In order to improve the corrosion resistance of weathering steel, it is often necessary to add Si, Cu, P, Cr, Ni and other corrosion-resistant alloy elements to ensure its good corrosion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/74C22C38/02C22C38/04C22C38/06C22C38/42C22C38/50
CPCB21B37/74C22C38/02C22C38/04C22C38/06C22C38/42C22C38/50
Inventor 张明博王宝华张振全邢俊芳张晓磊薛启河
Owner HEBEI IRON AND STEEL
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