ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The phase transformation rule, microstructures and properties of JG590 high strength steelproduced in Jinan Iron and Steel Co. ltd. have been investigated in this paper. When the chemicalcomposition of steel are given, the cooling rates after finished rolling affect on the properties of steelgreatly. The yield strength and tensile strength increasing, the elongation and reduction of areadecreasing as increasing of cooling rates after rolling. The main cause is due to appearance andincreasing of Bainite and Martensite other than Ferrite and Pearlite in room temperature. The finishedrolling temperature have distinct effects upon the mechanical properties of steel plates. Finishedrolling at different temperature with the 0.5°C/s cooling rate, the tensile strength vary in 599-698MPa,the yield strength changed from 412 MPa to 536MPa. The elongation is between 30.4-40.5%. Butwhen finished rolling at different temperature with the 2.0°C/s cooling rate, the tensile strength varyin 747-784MPa, the yield strength changed from 441 MPa to 601MPa. The strength index can bothmeet the requirements of employ. But the elongation is only 18.7-24.5%. This is related withproduction of lots of Bainite microstructure more than 2°C/s cooling rate. In the procedure ofmanufacture of JG590 high steel, the quickly cooling rate should be avoided to keep suitablemicrostructure and good elongation and toughness
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.29.pdf
Permalink