Preparation method of easy welding high strength toughness X80 pipe line steel for magnesium treatment

A pipeline steel and easy-to-weld technology, applied in the field of laboratory preparation of easy-to-weld high-strength and tough X80 pipeline steel, can solve the problems of insufficient welding performance, inability to weld with high line energy (stability), etc. Effect of Line Energy on Welding Performance

Inactive Publication Date: 2011-09-14
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0005] The purpose of the present invention is to provide a production method of magnesium-treated easy-to-weld high-strength and toughness X80 pipeline steel, especially to solve the problems of high-strength pipeline steel produced in traditional industries, which have insufficient welding performance and cannot be welded with large input energy (stability)

Method used

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  • Preparation method of easy welding high strength toughness X80 pipe line steel for magnesium treatment
  • Preparation method of easy welding high strength toughness X80 pipe line steel for magnesium treatment
  • Preparation method of easy welding high strength toughness X80 pipe line steel for magnesium treatment

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Embodiment 1

[0035] The design composition of the high-strength and high-toughness pipeline steel in this embodiment is: C 0.042, Si 0.18, Mn 1.65, P 0.001, S 0.002, O 0.0015, Al 0.02, Nb 0.045, Ti 0.015, Cr 0.3, Mo 0.22, Ni 0.25, Cu 0.26, Mg 0.005, Ti / Mg=3, the rest are Fe and unavoidable impurities.

[0036] According to the above ingredients, it is smelted in a vacuum induction furnace and cast into a slab of 50Kg; the slab is cut into a riser, and forged into a slab with a thickness of 100mm, a width of 90mm, and a length of 80mm; Heating time 90min; furnace temperature 1170°C, rough rolling start temperature 1150°C, rough rolling finish temperature 990°C; intermediate billet waiting temperature 50mm; finish rolling start temperature 870°C, finish rolling finish temperature 800°C; finish rolling Then quickly enter the ACC controlled cooling, the cooling speed is 20°C / s; the red temperature is 470°C, and the product thickness is 15mm.

[0037] figure 1 and figure 2 They are the scan...

Embodiment 2

[0039] The design composition of the high-strength and high-toughness pipeline steel in this embodiment is: C 0.041, Si 0.20, Mn 1.70, P 0.001, S 0.002, O 0.0015, Al 0.02, Nb 0.040, Ti 0.025, Cr 0.4, Mo 0.20, Ni 0.24, Cu 0.21, Mg 0.0025, Ti / Mg=10, the rest are Fe and unavoidable impurities.

[0040] According to the above composition, it is smelted in a vacuum induction furnace and cast into a slab of 50Kg; the slab is cut into a riser, and forged into a slab with a thickness of 100mm, a width of 90mm, and a length of 80mm; the slab is sent to the heating furnace, and the heating temperature is 1200°C The heating time is 90 minutes; the furnace temperature is 1180°C, the rough rolling start temperature is 1160°C, the rough rolling finish temperature is 990°C; After rolling, it quickly enters the ACC controlled cooling, the cooling rate is 22°C / s; the red return temperature is 440°C, and the product thickness is 12mm.

[0041] image 3 and Figure 4 It is the scanned tissue ...

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Abstract

A preparation method of easy welding high strength toughness X80 pipe line steel for magnesium treatment belongs to the production field of low alloy high strength steel, including first preparing materials according to constituent mixing rate, then smelting in a vacuum induction furnace, forging casting blank and controlling rolling and cooling. The preparation method is characterized in that the heating temperature is 1170-1230 DEG C prior to forging blank residues; the thermal time is 60-120min; and the beginning temperature of coarse rolling is 1100-1180 DEG C; the finishing temperature of coarse rolling is no less than 980 DEG C, the temperature-holding thickness of intermediate blank is 45-50mm; the beginning temperature of finish rolling is no more than 880 DEG C; the finishing temperature of finish rolling is 780-810 DEG C; the pressing rate of finish rolling is more than 3T (T: target thickness of finished products); and the target thickness of finished products is 10-15mm. After finish rolling, the product rapidly enters ACC for cooling control, with the cooling speed being 15-35 DEG C/s. the self-tempering temperature is 400-550 DEG C. The produced high strength toughness X80 pipe line steel has typical acicular ferrite tissue, as well as favorable comprehensive mechanical property and high input energy welding property.

Description

technical field [0001] The invention belongs to the field of low-alloy high-strength steel production, in particular to a laboratory preparation method of magnesium-treated easy-to-weld high-strength and tough X80 pipeline steel. Background technique [0002] With the rapid development of the national economy, the consumption of oil and natural gas continues to increase, and the domestic pipeline steel is developing extremely rapidly. The next 10 years will be a blowout period for the construction of oil and gas pipelines in my country. Due to its high strength and high toughness, X80 pipeline steel has been used in the main pipeline of the "Second West-East Gas Pipeline" gas pipeline project and the Sino-Russian oil pipeline project under construction. Although there are many large and medium-sized steel mills in China that can produce X80 grade pipeline steel, the traditional X80 grade pipeline steel is mainly designed with low carbon and high niobium composition. Although...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58B21B37/74
Inventor 武会宾朱海宝唐荻
Owner UNIV OF SCI & TECH BEIJING
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