High-corrosion resistant high-strength dual-phase hot-rolled stainless steel strip and hot rolling process thereof

A high-strength, strip-steel technology, applied in metal rolling, manufacturing tools, temperature control, etc., can solve the problems of increased cost, heavy equipment, failure, etc., and achieve improved flatness and coil shape, high strength, and superior chlorine resistance. The effect of ion pitting

Inactive Publication Date: 2010-06-23
朱浩锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ordinary Ni-Cr type austenitic stainless steel currently used in China is easy to fail due to corrosion during use. In order to prolong the service life, the thickness of the steel plate is often increased, which not only makes the equipment bulky but also increases the cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] High corrosion resistance and high strength dual-phase hot-rolled stainless steel strip, its weight percentage (Wt%) is: C: 0.03; Si: 0.4; Mn: 1.4; P: 0.02; S: 0.001; Cr: 22.5; Ni: 5.6; Mo: 3.0; Cu: 0.3; Al: 0.10; B: 0.0028; N: 0.150; Ti: 0.005;

[0011] The above-mentioned high-corrosion-resistant and high-strength duplex stainless steel is drawn and cast into a plate with a width of 1270mm, a thickness of 200mm, and a length of 10.6m after being drawn in an electric furnace (EAF), refining furnace (AOD), fine-tuning (LT), and continuous casting (CCP). Billet (Slab), then enter the hot rolling process.

[0012] The hot rolling process is divided into four parts: heating, rolling, cooling and curling. First of all, the heating part is loaded into the heating furnace according to the furnace loading standard, that is, the slabs are placed in the heating furnace at an interval of 50 mm. The heating zone and the upper temperature of the soaking zone of the heating furnace...

Embodiment 2

[0015] High corrosion resistance and high strength dual-phase hot-rolled stainless steel strip, its weight percentage (Wt%) is: C: 0.02; Si: 0.5; Mn: 1.5; P: 0.01; S: 0.001; Cr: 22.6; Ni: 5.6; Mo: 3.1; Cu: 0.4; Al: 0.05; B: 0.004; N: 0.170; Ti: 0.002;

[0016] The above-mentioned high-corrosion-resistant and high-strength duplex stainless steel is drawn and cast into a plate with a width of 1300mm, a thickness of 200mm, and a length of 9.8m after being drawn in an electric furnace (EAF), refining furnace (AOD), fine-tuning (LT), and continuous casting (CCP). Billet (Slab), then enter the hot rolling process.

[0017] The hot rolling process is divided into four parts: heating, rolling, cooling and curling. First of all, the heating part is loaded into the heating furnace according to the furnace loading standard, that is, the slabs are placed in the heating furnace at an interval of 50 mm. The heating zone and the upper temperature of the soaking zone of the heating furnace a...

Embodiment 3

[0020] High corrosion resistance and high strength dual-phase hot-rolled stainless steel strip, its weight percentage (Wt%) is: C: 0.03; Si: 0.7; Mn: 1.7; P: 0.005; S: 0.001; Cr: 22.7; Ni: 5.9; Mo: 3.2; Cu: 0.1; Al: 0.15; B: 0.004; N: 0.175; Ti: 0.003;

[0021] The above-mentioned high-corrosion-resistant and high-strength duplex stainless steel is drawn and cast into a plate with a width of 1320mm, a thickness of 200mm, and a length of 12.0m after being drawn in an electric furnace (EAF), refining furnace (AOD), fine-tuning (LT), and continuous casting (CCP). Billet (Slab), then enter the hot rolling process.

[0022] The hot rolling process is divided into four parts: heating, rolling, cooling and curling. First of all, the heating part is loaded into the heating furnace according to the furnace loading standard, that is, the slabs are placed in the heating furnace at an interval of 50mm. 1215°C and 1225°C, the slab is heated in the heating furnace for 220 minutes, then pu...

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Abstract

The invention discloses a high-corrosion resistant high-strength dual-phase hot-rolled stainless steel strip, which comprises the following components in percentage by weight: less than or equal to 0.03 percent of C; 0.4 to 0.7 percent of Si; 1.4 to 1.7 percent of Mn; less than or equal to 0.03 percent of P; less than or equal to 0.001 of S; 22.3 to 22.7 percent of Cr; 5.6 to 5.9 percent of Ni; 3.0 to 3.2 percent of Mo; less than or equal to 0.5 percent of Cu; less than or equal to 0.15 percent of Al; 0.0028 to 0.0043 percent of B; 0.145 to 0.175 percent of N; less than or equal to 0.005 percent of Ti; less than or equal to 0.99 percent of Pb; and the balance of Fe. The invention also provides a hot rolling process for the high-corrosion resistant high-strength dual-phase hot-rolled stainless steel strip. The stainless steel strip and the hot rolling process have the advantages that: the stainless steel strip has higher strength and more superior chloridion pitting resistance and stress corrosion resistance; and at the same time, the hot rolling process improves the planeness and the scrolling quality of the steel strip.

Description

technical field [0001] The invention relates to a duplex stainless steel and its hot-rolling process, in particular to a high-corrosion-resistant, high-strength hot-rolled duplex stainless steel strip and its hot-rolling process. Background technique [0002] With the continuous and rapid development of the domestic heavy chemical industry, the demand for industrial equipment such as petrochemical, seawater and wastewater treatment, and oil and gas pipelines has accelerated. The working conditions in these fields are very harsh, and there are various types of strong acids and alkalis, which put forward extremely high requirements for the corrosion resistance and strength of the equipment. The ordinary Ni-Cr austenitic stainless steel currently used in China is easy to fail due to corrosion during use. In order to prolong the service life, the thickness of the steel plate is often increased, which not only makes the equipment bulky but also increases the cost. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/54B21B37/74B21B37/16
Inventor 朱浩锋
Owner 朱浩锋
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