Efficient rolling method for 400-series stainless steel

A stainless steel and high-efficiency technology, applied in the metallurgical field, can solve the problems of low cost, low cold work hardening tendency, and difficult production, and achieve the effect of solving the problem of sticking rolls, optimizing the rolling process, and reducing the number of rough rolling passes.

Pending Publication Date: 2022-02-18
SHANDONG TAISHAN STEEL GROUP
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In terms of steel structure for consumption, compared with 300 series stainless steel, 400 series ferritic stainless steel has the following unique characteristics and advantages, namely: no or a small amount of nickel, saving nickel resources, low cost; low thermal expansion coefficient , good thermal conductivity, excellent stress corrosion resistance, low cold hardening tendency and other unique properties; it has broad application prospects in the fields of household appliances / electronics industry, kitchen facilities, automobile exhaust systems, and can replace 304 in many fields. Austenitic stainless steel; but its high technical content, difficult production, etc.
Therefore, there is an urgent need to design a high-efficiency rolling method for 400 series stainless steel to solve the problems of difficulty in producing 400 series stainless steel, low stability and high cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: The chemical composition and mass percentage of 430 stainless steel are: C: 0.08%, Si: 1.3%, Mn: 1.55%, P: 0.03%, S: 0.003%, Cr: 16.55%, N: 0.02 %, the balance is Fe and other alloy components and unavoidable impurities due to the specific steel type of 400 series.

[0028] Include the following steps:

[0029] 1) Dephosphorization of molten iron: use limestone for dephosphorization, remove the slag after dephosphorization, and clean the slag after pretreatment, the P of molten iron: 90ppm.

[0030] 2) TSR furnace smelting: control the amount of high-carbon ferrochrome added, TSR furnace smelting process controls the amount of high-carbon ferrochrome added to 25t, dephosphorized molten iron P is 0.0085%, blowing end point C: 0.075%, reduction time is 7 minutes , Cr after reduction: 16.6%, control the slag color after reduction to be white slag, strictly control the sulfur content of tapping, and the sulfur content of tapping is 0.003%; and use chamfering cry...

Embodiment 2

[0036] Example 2: The chemical composition and mass percentage of 410S stainless steel are: C: 0.02%, Si: 1.18%, Mn: 1.35%, P: 0.035%, S: 0.003%, Cr: 16.3%, N: 0.02 %, the balance is Fe and other alloy components and unavoidable impurities due to the specific steel type of 400 series.

[0037] Include the following steps:

[0038] 1) Dephosphorization of molten iron: use limestone for dephosphorization, remove the slag after dephosphorization, and clean the slag after pretreatment, the P of molten iron: 95ppm.

[0039] 2) TSR furnace smelting: control the amount of high-carbon ferrochrome added, TSR furnace smelting process controls the amount of high-carbon ferrochrome added to 25t, dephosphorized molten iron P is 0.009%, blowing end point C: 0.35%, reduction time is 7 minutes , Cr after reduction: 16.3%, control the slag color after reduction to be white slag, strictly control the sulfur content of tapping, and the sulfur content of tapping is 0.003%; and adopt chamfering c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an efficient rolling method for 400-series stainless steel. The method comprises the following steps: 1) molten iron dephosphorization: adopting limestone for dephosphorization, and performing thorough slagging-off after dephosphorization, wherein after pretreatment, the P content of molten iron is smaller than or equal to 95 ppm; 2) TSR furnace smelting: controlling the adding amount of high-carbon ferro-chrome, and adopting a chamfering crystallizer; 3) plate blank rolling: after hot rolling, directly performing cold rolling without annealing, controlling the finish rolling temperature of a steekle mill to be 1030-1050 DEG C, reducing rough rolling passes, and performing five passes of rolling to obtain a 3.0 mm black steel strip; 4) directly conveying the steel strip to a cold rolling mill, and performing five passes of rolling to obtain a white steel strip of 1.0 mm; and 5) acid pickling: performing solid solution and acid pickling operation at a temperature of 1210-1220 DEG C through cold annealing and acid pickling so as to realize sufficient solid solution, and finally acquiring a cold-rolled stainless steel product. The production process is high in stability, the production cost is reduced, the rolling efficiency is improved, and the quality of the stainless steel product is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a high-efficiency rolling method for 400 series stainless steel. Background technique [0002] Stainless steel is widely used in tableware, white goods, chemical industry, energy, transportation, construction and other fields because of its unique good corrosion resistance and high temperature resistance. In addition, various high-end stainless steels are widely used in industrial fields such as petrochemical industry, high voltage power station, boiler, nuclear power energy, equipment manufacturing, aerospace, marine engineering and military industry. The development status of 400 series ferritic stainless steel in China With the sustained and rapid development of my country's national economy and the improvement of people's living standards, the apparent consumption of stainless steel has grown rapidly, accounting for about 25% of the world's total consumption. However, my ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/18C22C38/38B21B1/22B21B37/74C21D1/26C21D6/00C21D8/02
CPCC22C33/06C22C38/02C22C38/04C22C38/38C22C38/001C22C38/18C21D1/26C21D6/002C21D6/005C21D6/008C21D8/0205C21D8/0221C21D8/0247B21B1/22B21B37/74
Inventor亓海燕曹旭东亓振宝赵树民亓磊亓颖豪武浩文何敏郭燕喜张海敬
OwnerSHANDONG TAISHAN STEEL GROUP