CN101117691A

CN101117691A - Technique for processing heavy caliber pipes

Info

Publication number: CN101117691A
Application number: CNA2006100408942A
Authority: CN
Inventors: 王厚祥; 陈生林
Original assignee: JIANGSU ZHENGXIANG PETROCHEMICAL EQUIPMENT MANUFACTURING Co Ltd
Current assignee: JIANGSU ZHENGXIANG PETROCHEMICAL EQUIPMENT MANUFACTURING Co Ltd
Priority date: 2006-07-31
Filing date: 2006-07-31
Publication date: 2008-02-06

Abstract

The present invention relates to a processing technique of a large-caliber tubular product, belonging to the metallurgical manufacturing field. The present invention is to add moderate Cr, Mn, Ni and the like alloyed elements to the raw melting materials, to conduct repeated cold-drawing techniques on the pierced billet through the centrifugal casting and produce a heat-resistant large-caliber alloyed tubular product that is urgently needed in the petrochemical industry. The tubular product has an excellent normal-temperature mechanical property and high-temperature mechanical feature, shortens the production period greatly, increases the alloy utilization rate by 20 percent or more and obtains a notable economic benefit.

Description

A kind of complete processing of heavy caliber pipe

Technical field: the present invention relates to a kind of tubing of heavy caliber size, particularly relate to a kind of complete processing of heavy caliber pipe, belong to metallurgical manufacturing field.

Technical background: large-scale petrochemical industry at home, widely used heating tube, boiler tube and heat-resistant component all adopt the heat-resisting alloy steel production of import.And the heat-resisting alloy steel of domestic production does not often reach designed requirement on ambient temperature mechanical properties and mechanical behavior under high temperature.And the alloy high temperature steel of import generally also need be swaged into excellent base, is processed into pipe, adds hot piercing and becomes hollow forging, after cold group of last one-tenth production tube of multi-pass.Adopt such production technique, need the multiple tracks complete processing on the one hand; On the other hand, also can waste alloy high temperature steel in a large number, the tubing of producing, quality also is difficult to the requirement that reaches designed.

Summary of the invention: purpose of the present invention is exactly the complete processing that a kind of heavy caliber pipe will be provided, and it can overcome the defective of above hot finished steel pipe, adopts centrifugally cast method direct production spun cast pipe, reduces its original multiple tracks complete processing.The complete processing of a kind of heavy caliber pipe of the present invention, its alloy content (all percentage calculation by weight) C is 0.05%, Mn less than 1.50%, P content less than 0.030%, S content less than 0.015%, Si content less than 1.0%, Cr content is 19%, Ni content is 30%, Cu content less than 0.75%, Ti content is 0.115%, Al content is 0.115%, all the other are Fe; During melting, the slag charge consumption is 25-35Kg, and its proportioning is CaO: CaFe=70: 30; Pre-deoxidation adds Si-Ca piece 250-350g, and Al piece 250-350g adds Mn; The Al-CaO powder is adopted in diffusive deoxidation, and consumption 8-9Kg divides 8-9 to criticize adding, and each batch criticized adding with 750-850g/ after first three batch criticized adding by 1Kg/; Get the stove sample after three batches of the deoxidations, insert the Ni-Mg rod, Mg content is 0.04% (weight percent); White slag kept 10-20 minute; Insert the Ni-Mg rod before the tapping, add metal Ca120-180g simultaneously; Tapping temperature is controlled at 1600-1620 ℃; Hollow forging processing; The spun cast pipe inside and outside wall carries out machining; Hollow forging must be through complete solution treatment before cold group, cooling fast, and Heating temperature is 1000-1180 ℃, soaking time 30 minutes to 4 hours; Production tube cold working will be passed through initial road, the cold system of multiple tracks, multiple tracks reaming, cold rolling, the cold skill of exchanging work of multiple tracks of multiple tracks, and per pass cold working all needs to carry out solution heat treatment.The heavy caliber alloy tubing that the present invention produces has good ambient temperature mechanical properties and high-temperature mechanics characteristic, has solved the history of extensive dependence on import alloy high-temperature resistant tube in the petrochemical industry well.

Embodiment: the present invention is a kind of complete processing of heavy caliber pipe, its alloy content (all percentage calculation by weight) C is 0.05%, Mn less than 1.50%, P content less than 0.030%, S content less than 0.015%, Si content less than 1.0%, Cr content is 19%, Ni content is 30%, Cu content less than 0.75%, Ti content is 0.115%, Al content is 0.115%, all the other are Fe; During melting, the slag charge consumption is 25-35Kg, and its proportioning is CaO: CaFe=70: 30; Pre-deoxidation adds Si-Ca piece 250-350g, and Al piece 250-350g adds Mn; The Al-CaO powder is adopted in diffusive deoxidation, and consumption 8-9Kg divides 8-9 to criticize adding, and first three batch criticized adding by 1Kg/, and each batch criticized adding with 750-850g/ later on; Get the stove sample after three batches of the deoxidations, insert the Ni-Mg rod, Mg content is 0.04% (weight percent); White slag kept 10-20 minute; Insert the Ni-Mg rod before the tapping and add metal Ca120-180g; Tapping temperature is controlled at 1600-1620 ℃; Hollow forging processing; The spun cast pipe inside and outside wall carries out machining; Hollow forging must be through complete solution treatment before cold group, cooling fast, and Heating temperature is 1000-1180 ℃, soaking time 30 minutes to 4 hours; Production tube cold working will pass through that initial road, multiple tracks are rolling, multiple tracks reaming, cold rolling, the cold skill of exchanging work of multiple tracks of multiple tracks, and per pass cold working all needs to carry out solution heat treatment.During concrete enforcement, to contain (weight percent calculating) C and be 0.05%, Mn is 1.50%, P is 0.030%, S is 0.015%, Cr is 19%, Ni is 30%, Cu is 0.75%, Ti is 0.115%, Al is 0.115%, all the other are put into smelting furnace for the raw material of Fe and smelt, during smelting, the slag charge consumption is controlled at 30Kg, pre-deoxidation adds Si-Ca piece 300g, and Al piece 300g adds Mn; The Al-CaO powder is adopted in diffusive deoxidation, consumption 9Kg, and, deoxidation feeds intake after three batches, gets the stokehold sample; White slag kept more than 15 minutes, inserted Ni-Mg rod (Mg content is 0.04%) and metal Ca150g before the tapping, and tapping temperature is controlled at 1610 ℃; During cast tube, at first to carry out inside and outside machining, carry out complete solution treatment before cold group hollow forging, cooling fast, Heating temperature is 1000-1180 ℃, is incubated 3 hours; Production tube needs before the per pass complete processing, all to need to carry out complete solution treatment through the multiple tracks complete processing.The last heavy caliber pipe that just can produce the petrochemical industry urgent need.The present invention can shorten the production cycle greatly, improves the utilization ratio of alloy, has good economic benefits and social benefit.

Claims

1. the complete processing of a heavy caliber pipe, its alloy content (all percentage calculation by weight) C is 0.05%, Mn less than 1.50%, P content less than 0.030%, S content less than 0.015%, Si content less than 1.0%, Cr content is 19%, Ni content is 30%, Cu content less than 0.75%, Ti content is 0.115%, Al content is 0.115%, all the other are Fe; During melting, the slag charge consumption is 25-35Kg, and its proportioning is CaO: CaFe=70: 30; Pre-deoxidation adds Si-Ca piece 250-350g, and Al piece 250-350g adds Mn; The Al-CaO powder is adopted in diffusive deoxidation, and consumption 8-9Kg divides 8-9 to criticize adding, and first three batch criticized adding by 1Kg/, and each batch criticized adding with 750-850g/ later on; Get the stove sample after three batches of the deoxidations, insert the Ni-Mg rod, Mg content is 0.04% (weight percent); White slag kept 10-20 minute; Insert the Ni-Mg rod before the tapping and add metal Ca 120-180g; Tapping temperature is controlled at 1600-1620 ℃; Hollow forging processing; The spun cast pipe inside and outside wall carries out machining; Hollow forging must be through complete solution treatment before cold group, cooling fast, and Heating temperature is 1000-1180 ℃, soaking time 30 minutes to 4 hours; Production tube cold working will be passed through initial road, the cold system of multiple tracks, multiple tracks reaming, cold rolling, the cold skill of exchanging work of multiple tracks of multiple tracks, and per pass cold working all needs to carry out solution heat treatment.