Development of high weather resistance and high strength cold-rolled structural steel GN... and its application in the m

Abstract: This paper introduces the general situation of the development of high weather resistance and high strength cold-rolled structural steel, and the application of steel in the manufacture of railway vehicles. The rectification measures for the problems existing in the steel in the manufacture of railway vehicles are proposed.

Keywords: weathering steel, cold-rolled structural steel, road vehicle

With the rapid growth of the national economy and the rapid development of railway passenger and cargo operations, railway transportation has become more and more busy, and railway vehicles urgently need to be developed to be high-strength, high-speed and light-weight. For more than ten years, the Ministry of Railways has used -.)/0%1'()'*"+, high weather-resistant hot-rolled materials, in order to improve the service life of passenger cars and the surface quality of components, reduce the weight of the car body, and simplify the The pretreatment production process urgently needs domestically produced cold-rolled steel sheets with high weather resistance, high strength, and excellent formability to meet the needs of railway passenger car manufacturing.
For this reason, the Ministry of Railways and BBN Iron and Steel Co., Ltd. have jointly developed a new material for the manufacture of railway passenger cars - high weather resistance, high strength cold-rolled structural steel since" Development overview of high weather resistance and high strength cold rolled structural steel
The corrosion resistance of steel is mainly related to the chemical composition. '( , ) , '* , "+ and other elements have an electrochemical depolarization effect, which can promote the formation of a uniform amorphous shape on the surface of the steel base after a certain period of time ! 3 45667 rust layer, and the dense and firm protection of amorphous iron oxyhydroxide Membrane, and itself slows down the erosion of atmospheric factors.
#% years of the 2% century , the Applied Research Institute of the United States Federal Corporation brilliantly developed the high weather resistance '6* 3 859/ steel matched with '( , ) , '* , "+ . Its relative corrosion resistance is copper-containing carbon More than 2 times that of steel , more than 1 times that of copper-free carbon steel , and widely used in vehicles, construction, agricultural machinery, power stations, air preheaters and other steel structures. $1## was introduced and imitated by countries all over the world after the patent was published in . Japan introduced patents, the grades are .)/ 3 7 , .)/ 3' , and it is the country with the fastest developing speed. ;% At the beginning of the 1990s, BBN Iron and Steel imitated -.)/ hot-rolled materials, and its weather resistance was the same as that of '6* 3 859/ is equivalent to Japan .)/ 3 7 steel has become a special steel for the manufacture of railway passenger cars. ;% In the middle of the 1990s, WISCO undertook the key scientific and technological research of "serialization research on atmospheric corrosion-resistant steel" issued by the State Science and Technology Commission and the Ministry of Metallurgy project,
Completed the topic ! Development of <& 245 MPa grade Cu-P steel ( 06CuPRE) cold-rolled structural steel resistant to atmospheric corrosion. This product has been used in production ) ?2 railway boxcar and BC type railway passenger car.
In order to develop high weather resistance and high strength cold-rolled structural steel as soon as possible, and improve the serialization of Cu , P , Cr , "+ series steel, in April 112 , according to the requirements of the Ministry of Railways and the possibility of its own production, BBN Iron and Steel launched the first round Small
The batch industrial test of GN3$0 (05CuPCrNi) steel grade fully meets the requirements of passenger car manufacturing process. In February , the Ministry of Railways organized a GN310 steel ministry-level project development coordination meeting in Tangshan. In the same year ; July, WISCO carried out the second round of 55- furnace expansion test.
The results of two rounds of tests show that the performance of high-weather-resistance and high-strength cold-rolled structural steel GN310 fully meets the manufacturing requirements, the trial production process is easy, and trial production can be carried out. Its trial production technical conditions WJX ( LZ ) $5-14 are shown in Table 1 and Table 2 :

Table 1 Steel Mechanical Properties

Finished Thickness ( II ) Delivery Status ! < (MPa) ! J ( MP>) " & (K ) cold bending ( 180. )
' 2.5 cold rolled annealed coil & 310 & 450 & 26 ! = a

The standard Q/WG (FZ)$6-12 of atmospheric corrosion-resistant cold-rolled steel sheet ( coil ) 06CuPRE is shown in Table 3 and Table 4 :

Ci	M9	P	. Cu Pi	RE added
'0G 08 0G $0 H	0G $5H	0G 06 H	' 0G 035 0G 20 H '0G	05 ' 0G $2
0G 40	0G 45	0G $2	0G 35
	Table 3	&0)*+12 steel mechanical properties
Finished Thickness (II)	! < (MPa)		! j (MP>) " 5 ( K )	Cold Bending ($80L)
' 2G 5	& 2Q5		& 390 & 30	! =a

It can be seen from the comparison in the above table that 05CuPC*Ni has higher strength than 06CuPRE , lower yield strength ratio , and excellent cold formability.

High-weather-resistance and high-strength cold-rolled structural steel GN3$0 is developed on the basis of -.P/hot-rolled high-weather-resistance steel and 06CuPRE cold-rolled weather - resistance steel . It has filled the blank of domestic cold-rolled high-strength steel, provided material guarantee for the rapid development of China's high-speed and quasi-high-speed railway passenger car transportation, and made contributions to the modernization of railways.
! Application of high-weather-resistant and high-strength cold-rolled structural steel in the manufacture of railway vehicles With the high-speed passenger transport in China, the heavy load of freight and the continuous start of new line projects, the Ministry of Railways has higher and higher requirements for steel quality, and The demand continues to increase, and the annual consumption of steel is about 3 million 8 . The annual consumption of steel used in the manufacture of railway vehicles is nearly 600,0008 , and 30,000 freight cars and 2,000H3,000 passenger cars are manufactured . Every year, only about 38,000 GN3$0 cold-rolled steel is needed to manufacture passenger cars , and other weather -resistant structural steels, such as railway containers, trucks, boxcars, locomotives, etc., make the prospect of promotion even broader .

Due to the high strength and thin plate of this steel, under the condition of high-speed locomotive traction, the running resistance can be further reduced due to the light weight of the vehicle body, and the energy consumption can be reduced! "# Above. Each passenger car can save more than 10,000 yuan in manufacturing costs . At the same time It needs to increase investment, and the existing equipment can be used for production, and it can also simplify the production process of passenger car manufacturing pretreatment, thereby reducing the cost and reducing steel imports. Because the steel has good paint adhesion and high weather resistance, it can extend the length of the passenger car. The time interval between factory repair and refurbishment can be improved, and the service efficiency and life of passenger cars can be improved. For example , the average service life of railway vehicles is extended from the original year to ! social and economic benefits.

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