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Wire rod production technology for ocean hose capable of resisting high pressure and high-concentration acid corrosion

A production process and high-concentration technology, applied in the field of marine hose wire rod production process, can solve problems such as corrosion, economic loss, hose failure, etc., and achieve the effect of high corrosion resistance and high strength corrosion resistance

Active Publication Date: 2014-04-02
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in marine hoses, the marine transport medium often contains high-pressure and high-concentration CO 2 、H 2 Corrosive gases such as S, these gases can cause corrosion to the steel in the middle layer of the marine hose through the inner layer, causing the hose to fail and causing major economic losses

Method used

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  • Wire rod production technology for ocean hose capable of resisting high pressure and high-concentration acid corrosion
  • Wire rod production technology for ocean hose capable of resisting high pressure and high-concentration acid corrosion
  • Wire rod production technology for ocean hose capable of resisting high pressure and high-concentration acid corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Specification: φ14mm1 furnace, 101.2t in total

[0024] (1) Smelting composition: C=0.14%, Si=0.39%, Mn=0.62%, P=0.011%, S=0.0019%; Alt=0.030%; refining slag basicity 6.3, white slag refining 33min, soft blowing 12min , the tundish temperature is 1544°C (the superheat of molten steel in the tundish is 23°C), the casting speed is 2.2m / min; the electromagnetic stirring current of the mold is 350A, the frequency is 4Hz, the electromagnetic stirring current at the end is 500A, and the frequency is 12Hz; The cross-sectional size of the billet is 150mm×150mm.

[0025] (2) Heating temperature: 1110-1135°C, starting rolling temperature: 970-1000°C; finishing rolling temperature: 940-970°C; rolling speed 85m / s; spinning temperature: 868-880°C; roller table speed 0.15m / s s; The damper of the fan is fully closed, and the insulation cover is fully closed except for 1#.

[0026] The results of the SSC test are as follows:

[0027]

[0028]

[0029] Note: The stre...

Embodiment 2

[0036] Embodiment 2: Specification: φ10mm1 furnace, 103.6t in total

[0037] (1) Smelting composition: C=0.12%, Si=0.34%, Mn=0.89%, P=0.013%, S=0.0025%; Alt=0.035%; refining slag basicity 6.1, white slag refining 31min, soft blowing 12min ;The tundish temperature is 1542°C (the superheat of molten steel in the tundish is 21°C), the casting speed is 2.3m / min; the electromagnetic stirring current of the crystallizer is 350A, the frequency is 4Hz, the electromagnetic stirring current at the end is 500A, and the frequency is 12Hz; The cross-sectional size of the billet is 150mm×150mm.

[0038] (2) Heating temperature: 1110-1145°C; starting rolling temperature: 980-1010°C; finishing rolling temperature: 945-965°C; rolling speed 85m / s; spinning temperature: 870-884°C; roller table speed 0.15m / s s; The damper of the fan is fully closed, and the insulation cover is fully closed except for 1#.

[0039] The results of the SSC test are as follows:

[0040]

[0041] Note: The stress c...

Embodiment 3

[0048] Embodiment 3: Specification: φ14mm1 furnace, 99.89t in total

[0049] (1) Smelting composition: C=0.06%, Si=0.22%, Mn=0.79%, P=0.012%, S=0.0021%; Alt=0.023%; refining slag basicity 6.0, white slag refining 32min, soft blowing 13min ;The tundish temperature is 1543°C (the superheat of molten steel in the tundish is 22°C), the casting speed is 2.4m / min; the electromagnetic stirring current of the crystallizer is 350A, the frequency is 4Hz, the electromagnetic stirring current at the end is 500A, and the frequency is 12Hz; The cross-sectional size of the billet is 150mm×150mm.

[0050] (2) Heating temperature: 1110-1140°C; starting rolling temperature: 975-1010°C; finishing rolling temperature: 935-975°C; rolling speed 85m / s; spinning temperature: 865-878°C; roller table speed 0.15m / s s; The damper of the fan is fully closed, and the insulation cover is fully closed except for 1#.

[0051] The results of the SSC test are as follows:

[0052]

[0053] Note: The stress...

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Abstract

The invention relates to a wire rod production technology for an ocean hose capable of resisting high pressure and high-concentration acid corrosion. Smelting components are as follows in percentage by weight: 0.05-0.15 percent of C, 0.20-0.50 percent of Si, 0.5-1.0 percent of Mn, 0.70-1.20 percent of Cr, 0.30-0.50 percent of Mo, 0.05-0.12 percent of Ti and 0.02-0.04 percent of Al. When a rotating furnace smelts 1 / 4 steel amount, the sequence of adding alloy materials is that steel core aluminum, BaAlSi, low-carbon ferromanganese, low-carbon ferrochromium and ferrosilicon; the refining basicity of white slag is 5.5-6.5; the degree of superheat of an intermediate ladle is 20+ / -5 DEG C; the pull speed is 2.2-2.5m / min; high-wire rolling heating temperature is 1,080-1,160 DEG C; the rolling starting temperature is 960-1,040 DEG C; the finish rolling temperature is 920-980 DEG C; the rolling speed is 80-95m / s; the spinning temperature is 850-900 DEG C; the cooling speed of Steyr controlled cooling is 4-5 DEG C / S. A wire rod produced by the technology disclosed bythe invention has the anti-corrosion steel tensile strength of more than or equal to 600MPa, the yield strength of more than or equal to 500MPa and the ductility of more than or equal to 15 percent, can conform to both H2S corrosion and CO2 corrosion and can resist corrosion under composite action of H2S and CO2; the loading force of stress corrosion test is 0.90 the yield strength.

Description

technical field [0001] The invention belongs to the technical field of marine hose production, and in particular relates to a production process of a wire rod for marine hoses resistant to high pressure and high-concentration acid corrosion. Background technique [0002] my country is rich in offshore oil and gas resources. With the gradual depletion of onshore oil and gas resources, it is imperative to develop advanced marine engineering materials. Marine hose is a new type of marine engineering material used in marine pipelines. It is a composite flexible tube with a multi-layer independent structure composed of polymer materials and metal materials. The inner and outer layers are made of polymer polymers. The material is continuously extruded, and the middle layer is formed by spiral winding of multiple layers of high-strength steel strips (or interlocking flat steel). At present, in marine hoses, the marine transport medium often contains high-pressure and high-concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28
Inventor 潘贻芳吴波王朝阳梁云科
Owner TIANJIN IRON & STEEL GRP
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