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| Content control of carbon, phosphor, sulfur and nitrogen in pipeline steel X70 at Shougang Group |
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Abstract The pipeline steel grade X70 used for Mid-Asia gas transportation project has very stringent requirements on its strength, toughness at low temperature and Drop Weight Tear Test(DWTT) values. Therefore phosphorus, sulfur, nitrogen and hydrogen contents in steel should be controlled as low as possible. At the same time low carbon concentrations with narrow ranges is also desired. At Shougang Shouqin steel plant X70 pipeline steel grade was successfully produced with the “Hot metal Desulphurization-BOF-LF-RH-CC” routine. The Carbon in steel is stabilized around 0.055% and the average content of sulfur, phosphor and nitrogen are 18ppm, 70ppm and 41ppm respectively. In the present paper the metallurgical technology for content control of above mentioned elements is discussed.
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Received: 12 June 2009
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2010, Vol. 45 
