Steel for marine riser flange of marine deepwater drilling and manufacturing method of marine riser flange

A technology for deepwater drilling and manufacturing methods, applied in drill pipes, drilling equipment, drill pipes, etc., can solve the problems of insufficient low carbon, high strength and toughness, mechanical properties and weldability that cannot meet actual needs, etc., and achieves good strength and toughness. Forgeability, effect of good low temperature fracture toughness

Inactive Publication Date: 2011-09-21
BAOJI PETROLEUM MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a steel for marine deepwater drilling riser flange, which solves the problem that the existing flange materials cannot meet the actual needs in terms of both mechanical properties and weldability, and the problem of insufficient low carbon, high strength and toughness

Method used

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  • Steel for marine riser flange of marine deepwater drilling and manufacturing method of marine riser flange
  • Steel for marine riser flange of marine deepwater drilling and manufacturing method of marine riser flange
  • Steel for marine riser flange of marine deepwater drilling and manufacturing method of marine riser flange

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Test small steel ingot number: 09001

[0040] Step 1, electric arc furnace smelting, first according to the following components and content ingredients, the reference unit of each component is Wt%: C0.17, Mn1.72, Mo0.3, Nb0.054, V0.05, Ti0.015, Ni0.6, Cu0.14, Cr0.06, Si0.16, S0.005, P0.01, the balance is Fe; then conduct electric arc furnace smelting to obtain molten steel, and remove harmful substances in the steel as much as possible during smelting Elemental and non-metallic inclusions;

[0041] Step 2. Vacuum refining. The molten steel obtained in step 1 is heated by electric arc and blown with argon gas to stir the molten steel under vacuum for degassing. The technical requirements for controlling the gas content of the steel are: [H]≤2ppm, [ O】≤20ppm, 【N】≤100ppm; 【S】≤0.010%;

[0042] Step 3. Steel ingot pouring. The inert gas is blown into the molten steel by using a blow-up sliding nozzle to uniform the composition and temperature, and purify the molten steel. T...

Embodiment 2

[0047] Test furnace number: 09303161444

[0048] Step 1, electric arc furnace smelting, first according to the following components and content ingredients, the reference unit of each component is Wt%: C0.18, Mn1.79, Mo0.29, Nb0.058, V0.079, Ti0.002, Ni0.89, Cu0.14, Cr0.14, Si0.2, S0.004, P0.019, the balance is Fe; then smelting in an electric arc furnace to obtain molten steel, and remove harmful substances in the steel as much as possible during smelting Elemental and non-metallic inclusions;

[0049] Step 2. Vacuum refining. The molten steel obtained in step 1 is heated by electric arc and blown with argon gas to stir the molten steel under vacuum for degassing. The technical requirements for controlling the gas content of the steel are: [H]≤2ppm, [ O】≤20ppm, 【N】≤100ppm; 【S】≤0.010%;

[0050] Step 3. Steel ingot pouring. The inert gas is blown into the molten steel by using a blow-up sliding nozzle to uniform the composition and temperature, and purify the molten steel. Th...

Embodiment 3

[0055] Test furnace number: 09303081817

[0056] Step 1, electric arc furnace smelting, first according to the following components and content ingredients, the reference unit of each component is Wt%: C0.18, Mn1.8, Mo0.29, Nb0.058, V0.08, Ti0.002, Ni0.9, Cu0.15, Cr0.15, Si0.2, S0.004, P0.019, the balance is Fe; then conduct electric arc furnace smelting to obtain molten steel, and remove harmful substances in the steel as much as possible during smelting Elemental and non-metallic inclusions;

[0057] Step 2. Vacuum refining. The molten steel obtained in step 1 is heated by electric arc and blown with argon gas to stir the molten steel under vacuum for degassing. The technical requirements for controlling the gas content of the steel are: [H]≤2ppm, [ O】≤20ppm, 【N】≤100ppm; 【S】≤0.010%;

[0058] Step 3. Steel ingot pouring. The inert gas is blown into the molten steel by using a blow-up sliding nozzle to uniform the composition and temperature, and purify the molten steel. The...

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PUM

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Abstract

The invention discloses steel for a marine riser flange of marine deepwater drilling. The steel comprises the following components in percentage by weight: 0.13 to 0.21 percent of C, 1.65 to 1.95 percent of Mn, 0.25 to 0.35 percent of Mo, 0.03 to 0.09 percent of Nb, 0.02 to 0.08 percent of V, less than or equal to 0.015 percent of Ti, 0.5 to 0.9 percent of Ni, 0.07 to 0.2 percent of Cu, less than or equal to 0.15 percent of Cr, less than or equal to 0.22 percent of Si, less than or equal to 0.01 percent of S, less than or equal to 0.02 percent of P and the balance of Fe. The invention also discloses a manufacturing method of the marine riser flange of marine deepwater drilling. The method comprises the following steps of: preparing the materials according to the content of the components, and smelting the materials in an arc furnace to obtain molten steel, and heating the molten steel with arc in vacuum and stirring the molten steel by blowing argon to degas the molten steel; casting a steel ingot, blowing an inert gas through a blowing sliding water gap, balancing the components and the temperature and purifying the molten steel; forging the obtained steel ingot and annealing the steel ingot after forging; machining and polishing the steel ingot; and performing die forging on the steel ingot to obtain the finished product of the marine riser flange. By the manufacturing method, each mechanical property of the steel and the marine riser flange meets the requirements on API related steel for marine riser flange by setting the best component proportion and a heat treatment process.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration equipment, and relates to a steel for a marine deepwater drilling riser flange, and also relates to a manufacturing method for a marine deepwater drilling riser flange. Background technique [0002] The marine deepwater drilling riser system is one of the key equipment in oil exploration. The main lines of the drilling riser are connected by welding with flanges. Therefore, the choice of flange material is very important. It is necessary to ensure that the riser system is used In order to ensure the safety, the flange material should not only have good mechanical properties, but also have good weldability. According to product design requirements, the current main line material of the existing riser is X80 steel, so the flange material connected with it must be the steel type with low carbon content as the first choice, but the material of the existing flange has both mechanical prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/16E21B17/02
Inventor 武战学党恩张成连李伟阳刘宏亮
Owner BAOJI PETROLEUM MASCH CO LTD
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