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High-strength stainless steel tube with excellent toughness and manufacturing method thereof

A technology of stainless steel pipe and manufacturing method, which is applied in the field of iron-based alloy steel pipe and its manufacture, can solve the problems of poor impact toughness and low toughness of 150 steel grade casing, and achieve the effect of excellent toughness, high strength and good CO2 resistance

Inactive Publication Date: 2013-09-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the 150 steel grade casing in Well Keshen-1 failed due to poor impact toughness and abandoned the well, causing direct economic losses of hundreds of millions of yuan. The toughness of the 150 steel grade casing is relatively low, about 20J

Method used

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  • High-strength stainless steel tube with excellent toughness and manufacturing method thereof
  • High-strength stainless steel tube with excellent toughness and manufacturing method thereof
  • High-strength stainless steel tube with excellent toughness and manufacturing method thereof

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Embodiment A-J and comparative example a-i

[0049] Produce the excellent high-strength 17Cr stainless steel pipe of toughness described in the present invention according to the following steps:

[0050] 1) Smelting: smelting and controlling the proportion of each chemical element as shown in Table 1;

[0051] 2) Casting: casting molten steel into steel ingots;

[0052] 3) Forging into round tube billet;

[0053] 4) Annealing: Anneal the tube blank at a temperature of 640-720 °C;

[0054] 5) Heating: Heat the tube blank to 1050-1250°C, and the heating time is 1-3h;

[0055] 6) After piercing, hot rolling and sizing, it is made into a blank tube;

[0056] 7) Quenching: heat the steel pipe to a temperature of 900-1000°C and keep it for 40 minutes, then cool it with water;

[0057] 8) Tempering: Temper the steel pipe at a temperature of 500-640°C, and the tempering holding time is ≤2h to obtain a stainless steel pipe of 114.3mm*12.7mm.

[0058] Table 1 shows the mass percentage distribution of each chemical element in...

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Abstract

The invention discloses a high-strength stainless steel tube with the excellent toughness. The high-strength stainless steel tube with the excellent toughness comprises the following chemical elements in percentage by mass: less than or equal to 0.0.6% of C, 17%-20% of Cr, 3%-6% of Ni, 1.5%-3.5% of Mo, 0.1%-0.8% of Si, 0.05-0.6% of Mn, 0.01-0.05% of N0, less than or equal to 0.01% of Al, Cu, at least one of Nb, V and Ti and the balance of Fe and other inevitable impurities, wherein the Cu, the Nb, the V and the Ti meet the following conditions: Cu / 3.25+(Nb+Ti) / 17+V / 2.4 is greater than 0.29 and is less than 0.74, and Nb+V+Ti is less than 0.2%. Correspondingly, the invention also discloses a manufacturing method of the stainless steel tube. The stainless steel tube disclosed by the invention has high strength as well as excellent toughness and good CO2 and Cl corrosion resistance at high-temperature environments.

Description

technical field [0001] The invention relates to an iron-based alloy steel pipe and a manufacturing method thereof, in particular to a stainless steel pipe and a manufacturing method thereof. Background technique [0002] in CO 2 In oil and gas extraction environments, anti-CO 2 13Cr series martensitic stainless steel pipe with excellent corrosion performance, the steel grade of the stainless steel pipe ranges from 80 to 110. With the continuous development of oil and gas exploration towards geologically complex areas, the depth of oil and gas wells continues to increase, and the pipes used for oil and gas exploitation are also faced with greater strength, higher temperature (above 150°C) and harsher corrosion environment (high CO 2 Partial pressure, Cl - Coexistence) requirements, under such conditions, the commonly used 13Cr series martensitic stainless steel has been far from meeting the above requirements. The corrosion resistance of steel can be increased by further ...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/46C22C38/48C22C38/50C21D8/10
Inventor 刘耀恒张春霞张忠铧
Owner BAOSHAN IRON & STEEL CO LTD
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