ANALYSIS OF COKING AND CABURIZING OFHP HEAT-RESISTANT STEEL

J Chin Soc Corr Pro

2002, Vol. 22

Issue (5): 286-289 DOI:

Research Report

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ANALYSIS OF COKING AND CABURIZING OFHP HEAT-RESISTANT STEEL

Chusen Li;Yuansheng Yang;Xinqiang Wu

中科院金属所

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Abstract This paper deals with the coking and caburizing of the used cracking tube made by HP heat-resistant steel.The experiments show that the structure on the cross-section of the used cracking tube is consisted of th e oxide and coking layer,the chromium depletion layer,and the inner carburized la yer due to serious carburizing.It is found that there is filamentary coke near t he surface of the tube but the spherical coke exists far from the surface of the tube.The initial coking behaviour of HP heat-resistant steel is investigated by quick coking experiment.During the initial coking stage,the filamentary is form ed under the catalytic action of nickel or iron elements in the steel,although t here is a Cr2O3 film on the surface of the steel.The hydrocarbon cracking in termediates can permeate the Cr2O3 film and combine with the nickel or iron elements in the steel,which arouses the catalytic coking,and causes the destruct ion of the Cr2O3 film and serious coking and carburizing.With increasing of the cracking time,the spherical coke begins to develop instead of the catalytic filamentary coke.

Key words: HP heat-resistant steel catalytic coke caburization

Received: 04 February 2001

ZTFLH:	O621.25+4.2
	O643.38

Corresponding Authors: Chusen Li

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Chusen Li; Yuansheng Yang; Xinqiang Wu. ANALYSIS OF COKING AND CABURIZING OFHP HEAT-RESISTANT STEEL. J Chin Soc Corr Pro, 2002, 22(5): 286-289 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I5/286

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[1]	;. Coking and Carburizing Behaviors of Metal Materials in High Temperature Carbon-Containing Atmosphere[J]. 中国腐蚀与防护学报, 2004, 24(3): 188-192 .
[2]	Chuseng Li; Li Yu; Yuansheng Yang. COKING BEHAVIORS OF THREE KINDS OF METALSAND THEIR OXIDE FILMS DURING THERMAL CRACKING REACTION OF HYDROCARBONS[J]. 中国腐蚀与防护学报, 2001, 21(3): 158-166 .

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