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Steel for bend pipes and pipe fittings for oil and gas transportation in low-temperature environment and manufacturing method

A low-temperature environment and pipe bending technology, which is used in manufacturing tools, heat treatment equipment, furnaces, etc., to achieve the effect of improving low-temperature toughness, excellent low-temperature toughness and welding performance

Inactive Publication Date: 2018-05-29
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is undoubtedly a huge challenge for steel pipes using traditional components, processes and organizational systems

Method used

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  • Steel for bend pipes and pipe fittings for oil and gas transportation in low-temperature environment and manufacturing method
  • Steel for bend pipes and pipe fittings for oil and gas transportation in low-temperature environment and manufacturing method
  • Steel for bend pipes and pipe fittings for oil and gas transportation in low-temperature environment and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A steel plate for elbows and pipe fittings suitable for oil and gas transportation in low-temperature environments. The raw materials are: C: 0.03wt%, Si: 0.2wt%, Mn: 0.4wt%, Cu: 1.0wt%, Cr : 0.8wt%, Ni: 0.8wt%, Nb: 0.03wt%, Mo: 0.3wt%, P: 0.0095wt%, S: 0.0020wt%, the balance is Fe and unavoidable impurities. Cast into 300mm billet.

[0027] Heat the slab to 1200°C, keep it warm for 2.0 hours, and then carry out the first stage—rolling in the recrystallization zone. The starting temperature of rolling is 1120°C, the temperature of the last pass of rough rolling is 1000°C, and the deformation of the last pass of rough rolling is 20%. ; The second stage - rolling in the non-recrystallized area, the starting rolling temperature is 950 ° C, the final rolling temperature is 860 ° C, and the thickness of the rolled plate is 33 mm. After rolling, accelerate cooling to 500°C at a cooling rate of 12°C / s, and then air cool to room temperature.

[0028] Take three test materials...

Embodiment 2

[0033]A steel plate for elbows and pipe fittings suitable for oil and gas transportation in low-temperature environments. The raw materials are: C: 0.03wt%, Si: 0.3wt%, Mn: 0.6wt%, Cu: 1.3wt%, Cr : 1.0wt%, Ni: 1.2wt%, Nb: 0.04wt%, Mo: 0.4wt%, P: 0.0085wt%, S: 0.0020wt%, the balance is Fe and unavoidable impurities. Cast into 300mm billet.

[0034] Heat the cast slab to 1200°C, keep it warm for 3.0 hours, and then carry out the first stage—rolling in the recrystallization zone, the starting temperature of rolling is 1120°C, the temperature of the last pass of rough rolling is 980°C, and the deformation of the last pass of rough rolling is 25% ; The second stage—rolling in the non-recrystallization zone, the starting rolling temperature is 950°C, the final rolling temperature is 850°C, and the plate thickness after rolling is 33mm. After rolling, accelerate cooling to 500°C at a cooling rate of 15°C / s, and then air cool to room temperature.

[0035] Three test materials were t...

Embodiment 3

[0041] A steel plate for elbows and pipe fittings suitable for oil and gas transportation in low-temperature environments. The raw materials are: C: 0.04wt%, Si: 0.3wt%, Mn: 1.0wt%, Cu: 1.2wt%, Cr : 1.5wt%, Ni: 1.8wt%, Nb: 0.06wt%, Mo: 0.4wt%, P: 0.0087wt%, S: 0.0020wt%, the balance is Fe and unavoidable impurities. Cast into 300mm billet.

[0042] Heat the cast slab to 1200°C, keep it warm for 3.0 hours, and then carry out the first stage—rolling in the recrystallization zone, the starting temperature of rolling is 1100°C, the temperature of the last pass of rough rolling is 980°C, and the deformation of the last pass of rough rolling is 25% ; The second stage - rolling in the non-recrystallized area, the starting rolling temperature is 950 ° C, the final rolling temperature is 830 ° C, and the thickness of the rolled plate is 30mm, 33mm and 52mm. After rolling, accelerate cooling to 500°C at a cooling rate of 15°C / s, and then air cool to room temperature.

[0043] Take thr...

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PUM

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Abstract

The invention relates to steel for bend pipes and pipe fittings for oil and gas transportation in a low-temperature environment and a manufacturing method, belongs to the technical field of high-strength low-alloy steel, and can be used in the field of production of the bend pipes and the pipe fittingsfor a low-temperature field stationwith extremely high requirements for low temperature toughness. The steel for the bend pipes and the pipe fittings is prepared from C: 0.02-0.05 wt%, Si: <=0.50 wt%, Mn: 0.2-1.3 wt%, Nb: 0.02- 0.06 wt%, Mo: 0-0.50 wt%, Ni: 0.5-2.5 wt%, Cr: 0-2.0 wt%, Cu: 1.0-2.0wt%, P: <=0. 015wt%, S: <=0.003wt% and the balance Fe and inevitable impurities. The preparation method includes: smelting, continuous casting, heating, controlled rolling and controlled cooling, quenching and aging treatment. A steel plate applied to the bend pipes and the pipe fittingsfor the low-temperature field stationhas relatively different strength grades of X65 to X80 and excellentlow temperature toughness of CVN (-80 DEG C)>=180J, and the steel plate can be applied to the bend pipes and the pipe fittings for field stations and suspended span pipe sections in colder latitudes.

Description

technical field [0001] The invention belongs to the technical field of high-strength low-alloy steel, and in particular relates to steel for elbows and pipe fittings suitable for oil and gas transportation in low-temperature environments and a manufacturing method. Background technique [0002] As the world's oil and gas resources are exhausted, new resource exploitation is gradually extending to areas with harsh geological conditions such as polar regions, oceans, and deserts. The climate in the alpine region is cold, the environment is harsh, and even perennially frozen or covered with ice and snow, the pipeline passing through this region must have good low temperature performance. At the same time, in order to improve the efficiency of oil and gas transmission, modern pipeline construction is developing in the direction of high steel grade and thick specifications. At present, the high-grade steel (K65) low-temperature pipelines (minimum operating temperature -20°C, min...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48C21D9/00C21D8/02
Inventor 贾书君刘清友童帅李拔
Owner CENT IRON & STEEL RES INST