Corrosion-resistant pressure-bearing seamless steel tube and production method thereof

A technology of seamless steel pipe and production method, applied in the field of metallurgical steel pipe, can solve the problems of short service life, poor corrosion performance, anti-flow acceleration, etc., and achieve the effects of reducing production cost, improving production efficiency, good strength and plasticity

Inactive Publication Date: 2018-07-13
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the seamless steel pipes in the prior art have poor corrosion resistance, pressure resistance, flow-accelerated corrosion resistance, and short service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1, preparation of corrosion-resistant pressure-bearing seamless steel pipe

[0055] Use desulfurized molten iron that meets the requirements. Requirements for molten iron: P≤0.120%, S≤0.050%, and the quality of all alloys and raw materials must meet the standard requirements;

[0056] End point control target of converter smelting: C≥0.06%, P≤0.015%, S≤0.020%; nickel plate and copper alloy are added with scrap steel; silicon manganese and ferromanganese are used for deoxidation alloying; final deoxidation is deoxidized with aluminum;

[0057] During VD vacuum degassing, the vacuum degree is 0.03Kpa; the deep vacuum time is 13 minutes, and the 250m silicon-calcium wire is fed after vacuum; the soft blowing time after the deep vacuum is 15 minutes, and the soft blowing flow rate is 70N1 / min;

[0058] In the round billet continuous casting process, the billet size is φ390mm, controlled by constant casting speed; electromagnetic stirring process is adopted; the sup...

Embodiment 2

[0066] Embodiment 2, preparation of corrosion-resistant pressure-bearing seamless steel pipe

[0067] Adopt the operation similar to the embodiment, rolling the seamless steel pipe with the specification of Ф273×28mm; the heat treatment system adopts 930°C±10°C normalizing, heat preservation for 45min (soaking period) and air cooling; 620°C±10°C tempering+ 90min (soaking period) after heat preservation, air cooling to obtain seamless steel pipes.

[0068] The mechanical properties of the seamless steel pipe obtained in this example were tested, and the tensile strength Rm was 643MPa; the yield strength was 544; the elongation A after breaking was 24%;

[0069] The seamless steel pipe obtained in this embodiment was tested for non-metallic inclusions, and the grain size was 8.5, and the structure was ferrite plus bainite, indicating that the seamless steel pipe obtained in this embodiment had a good structure quality;

Embodiment 3

[0070] Embodiment 3, preparation of corrosion-resistant pressure-bearing seamless steel pipe

[0071] Use desulfurized molten iron that meets the requirements. Requirements for molten iron: P≤0.120%, S≤0.050%, and the quality of all alloys and raw materials must meet the standard requirements;

[0072] End point control target of converter smelting: C≥0.06%, P≤0.015%, S≤0.020%; nickel plate and copper alloy are added with scrap steel; silicon manganese and ferromanganese are used for deoxidation alloying; final deoxidation is deoxidized with aluminum;

[0073] During VD vacuum degassing, the vacuum degree is 0.04Kpa; the deep vacuum time is 13 minutes, and a 250m silicon-calcium wire is fed after vacuum; the soft blowing time after the deep vacuum is 15 minutes, and the soft blowing flow rate is 70N1 / min;

[0074] Round billet continuous casting process, casting billet size is φ430mm, adopts constant casting speed control; adopts electromagnetic stirring process; molten steel ...

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Abstract

The invention discloses a corrosion-resistant pressure-bearing seamless steel tube. The steel tube comprises the following components of, by weight, 0.11-0.15% of C, 0.30-0.45% of Si, 0.90-1.10% of Mn, 0.15-0.25% of Cr, 1.10-1.30% of Ni, 0.55-0.65% of Cu, 0.015-0.025% of Nb, 0.015-0.045% of Al, 0.01-0.02% of Ti, less than or equal to 0.020% of P, less than or equal to 0.010% of S and less than orequal to 0.008% of N. The invention further discloses a production method of the seamless steel tube. The corrosion-resistant pressure-bearing seamless steel tube produced by the production method iscorrosion-resistant and pressure-bearing and high in flowing resistance and accelerated-corrosion resistance, so that the service life is prolonged, pipeline transportation safety is improved, and meeting of requirements of social development are facilitated.

Description

technical field [0001] The invention relates to the technical field of metallurgical steel pipes, in particular to a corrosion-resistant pressure-bearing seamless steel pipe and a production method thereof. Background technique [0002] WB36 seamless steel pipe is mainly used for main water supply and main steam pipelines of nuclear power conventional islands. WB36 is a Ni-Cu-Mo type alloy structural steel with good weldability and high temperature resistance. Adding Ni, Cu, Mo, Nb and other alloying elements to the steel greatly improves the high temperature strength of the steel. Its service temperature is about 400°C, and the maximum service temperature can reach 500°C. Creep does not occur during use, but the flow rate of the medium in the pipe body is high and the flow rate is large (about 1.3-1.6 times that of thermal power); the saturated steam with high flow rate, large flow rate and medium temperature and pressure with a certain humidity will produce Flow Accelera...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C33/04C21D8/10C21D9/08C21D1/18
CPCC22C38/02C21D1/18C21D8/105C21D9/08C22C33/04C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50
Inventor 郭智韬宋江波
Owner BAOTOU IRON & STEEL GRP
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