Hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate for offshore drilling platform and producing method for hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate

A steel plate production method and hydrogen sulfide resistance technology, applied in the field of metallurgy, can solve problems that restrict the development of national economic construction, etc., and achieve the effects of excellent hydrogen sulfide corrosion resistance, excellent impact toughness, and reduced sulfur content

Active Publication Date: 2017-03-22

WUYANG IRON & STEEL

3 Cites 8 Cited by

AI-Extracted Technical Summary

Problems solved by technology

For a long time, due to the lack of necessary production equipment and technical support, and because there is no domestic mature experience in the production of hydrogen sulfide corrosion-resistant quenched ...

Abstract

The invention discloses a hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate for an offshore drilling platform. The steel plate consists of the following chemical components in percentage by weight: 0.13%-0.15% of C, 0.15%-0.35% of Si, 1.10%-1.30% of Mn, 1.20%-1.25% of Ni, less than or equal to 0.012% of P, less than or equal to 0.003% of S, 0.020%-0.050% of Al, 0.020%-0.030% of Nb, 0.030%-0.040% of V, 0.015%-0.02% of Ti, 1.00%-1.10% of Cr, 0.40%-0.50% of Mo, 0.0005%-0.0015% of B, less than or equal to 0.25% of Cu, and the balance Fe and inevitable impurities. A production method comprises the processes of heating, rolling and thermal treatment. The steel plate produced by the production method has the characteristics of being uniform in component and internally compact, has a good structure, good comprehensive properties, good hydrogen sulfide corrosion resistance and good welding performance, and the performances of the steel plate completely meet operating requirements of the hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate for the offshore drilling platform.

Technology Topic

Steel platesCorrosion resistant +5

Examples

Experimental program(4)

Example Embodiment

[0034] Example 1

[0035] The hydrogen sulfide corrosion-resistant quenched and tempered high-strength steel plate for offshore drilling platform adopts the following composition ratio and production process. Composition ratio (wt): C: 0.15%, Si: 0.24%, Mn: 1.16%, Ni: 1.20%, P: 0.010%, S: 0.003%, Al: 0.035%, Nb: 0.023%, V: 0.035 %, Ti: 0.018%, Cr: 1.05%, Mo: 0.45%, B: 0.0005%, Cu: 0.12%, the balance is Fe and unavoidable impurities. The thickness is 85mm.

[0036] Production process: (1) Smelting process: The molten steel is first smelted in the primary smelting furnace and then sent to the LF refining furnace for refining. Increased slag volume and multiple flows of slag are used to facilitate the removal of P. The vacuum of the ladle VD furnace is 1580℃. During the refining process, 4kg/t molten steel for aluminum wire and 5.5m/t molten steel for Si-Ca wire are fed into the molten steel during the refining process, the vacuum degree is 66 Pa during vacuum treatment, and the vacuum holding time is 25 minutes.

[0037] (2) Continuous casting process: the superheat is 13℃, the drawing speed is 0.95m/min, and the continuous casting is obtained.

[0038] (3) Heating process: the continuous casting slab is heated in a continuous heating furnace, the maximum heating temperature is 1240℃, the soaking temperature is 1200℃, and the total heating time is 11min/mm.

[0039] (4) Rolling process: the rolling temperature of the first stage is 1050℃, the pass reduction rate is 10%, the final rolling temperature is 920℃, and the cumulative reduction rate is 40%; the thickness of the open steel is 150mm, and the second stage The start rolling temperature is 880℃, the final rolling temperature is 820℃, the cumulative reduction rate is 45%, and the single pass reduction rate is 12%.

[0040] (5) Heat treatment: adopt quenching + tempering process, quenching cooling medium is water, quenching temperature is 900℃, heat preservation coefficient 2.1min/mm, roll speed 4m/mim, water cooling accelerated cooling, tempering temperature is 650℃, heat preservation Time 5.5min/mm.

[0041] The mechanical properties and hydrogen sulfide corrosion resistance of the hydrogen sulfide corrosion-resistant quenched and tempered high-strength steel sheet for offshore drilling platforms obtained in this example: yield strength 780MPa, tensile strength 840MPa, -40°C transverse impact energy average 150J, hardness 285HB/295HB/305HB , HIC (hydrogen sulfide corrosion resistance) test results are CLR: 0.05%, CTR: 0.01%, CSR: 0.003%.

Example Embodiment

[0042] Example 2

[0043] The hydrogen sulfide corrosion-resistant quenched and tempered high-strength steel plate for offshore drilling platform adopts the following composition ratio and production process. Composition ratio (wt): C: 0.14%, Si: 0.26%, Mn: 1.09%, Ni: 1.21%, P: 0.008%, S: 0.002%, Al: 0.038%, Nb: 0.025%, V: 0.033 %, Ti: 0.015%, Cr: 1.08%, Mo: 0.48%, B: 0.0009%, Cu: 0.10%, the balance is Fe and unavoidable impurities. The thickness is 60mm.

[0044] Production process: (1) Smelting process: the molten steel is first smelted in the primary smelting furnace, and then sent to the LF refining furnace for refining. Increased slag volume and multiple slag flow are used to facilitate the removal of P. The vacuum of the ladle VD furnace is 1590℃. During the refining process, 4kg/t molten steel for aluminum wire and 5m/t molten steel for Si-Ca wire are fed into the molten steel during the refining process. The vacuum degree is 68Pa during vacuum treatment and the vacuum retention time is 23min.

[0045] (2) Continuous casting process: the superheat is 13℃, the drawing speed is 1.00m/min, and the continuous casting is obtained.

[0046] (3) Heating process: the continuous casting billet is heated in a continuous heating furnace, the maximum heating temperature is 1240℃, the soaking temperature is 1220℃, and the total heating time is 11min/mm.

[0047] (4) Rolling process: the rolling temperature of the first stage is 1050℃, the pass reduction rate is 10%, the final rolling temperature is 920℃, and the cumulative reduction rate is 40%; the thickness of the open steel is 120mm, and the second stage The start rolling temperature is 870℃, the final rolling temperature is 810℃, the cumulative reduction rate is 45%, and the single pass reduction rate is 12%.

[0048] (5) Heat treatment: adopt quenching + tempering process, quenching cooling medium is water, quenching temperature is 900℃, heat preservation coefficient 2.0min/mm, roll speed 4m/mim, water cooling accelerated cooling, tempering temperature is 660℃, heat preservation Time 5.5min/mm.

[0049] The mechanical properties and hydrogen sulfide corrosion resistance of the hydrogen sulfide corrosion-resistant quenched and tempered high-strength steel plate for offshore drilling platforms obtained in this example: yield strength 790MPa, tensile strength 840MPa, -40°C transverse impact energy average 200J, hardness 290HB/300HB/305HB , HIC (hydrogen sulfide corrosion resistance) test results are CLR: 0%, CTR: 0%, CSR: 0%.

Example Embodiment

[0050] Example 3

[0051] The hydrogen sulfide corrosion-resistant quenched and tempered high-strength steel plate for offshore drilling platform adopts the following composition ratio and production process. Composition ratio (wt): C: 0.13%, Si: 0.15%, Mn: 1.30%, Ni: 1.25%, P: 0.012%, S: 0.001%, Al: 0.020%, Nb: 0.020%, V: 0.030 %, Ti: 0.02%, Cr: 1.00%, Mo: 0.50%, B: 0.0015%, Cu: 0.20%, the balance is Fe and unavoidable impurities. The thickness is 85mm.

[0052] Production process: (1) Smelting process: the molten steel is first smelted in the primary smelting furnace, and then sent to the LF refining furnace for refining. Increased slag volume and multiple slag flow are used to facilitate the removal of P. When the ladle temperature is 1600℃, the vacuum of the ladle VD furnace During the refining process, 3kg/t molten steel for aluminum wire and 6m/t molten steel for Si-Ca wire are fed into the molten steel during the refining process, the vacuum degree is 70Pa during vacuum treatment, and the vacuum holding time is 15min.

[0053] (2) Continuous casting process: the superheat is 20℃, the drawing speed is 1.05m/min, and the continuous casting is obtained by continuous casting.

[0054] (3) Heating process: the continuous casting slab is heated in a continuous heating furnace, the maximum heating temperature is 1220℃, the soaking temperature is 1210℃, and the total heating time is 12min/mm.

[0055] (4) Rolling process: the rolling temperature of the first stage is 1100℃, the pass reduction is 30%, the final rolling temperature is 920℃, and the cumulative reduction is 50%; the thickness of the open steel is 145mm, the second stage The start rolling temperature is 850℃, the final rolling temperature is 800℃, the cumulative reduction rate is 30%, and the single pass reduction rate is 10%.

[0056] (5) Heat treatment: adopt quenching + tempering process, quenching cooling medium is water, quenching temperature is 910℃, heat preservation coefficient 2.3min/mm, roll speed 7m/mim, water cooling accelerated cooling, tempering temperature is 670℃, heat preservation The time is 4.5min/mm.

[0057] The mechanical properties and hydrogen sulfide corrosion resistance of the hydrogen sulfide corrosion-resistant quenched and tempered high-strength steel sheet for offshore drilling platforms obtained in this example: yield strength 790MPa, tensile strength 855MPa, -40°C transverse impact energy average 210J, hardness 300HB/295HB/300HB , HIC (hydrogen sulfide corrosion resistance) test results are CLR: 0%, CTR: 0%, CSR: 0%.

PUM

Property	Measurement	Unit
Yield strength	780.0	mPa
Tensile strength	840.0	mPa
Lateral impact energy	150.0	J

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Hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate for offshore drilling platform and producing method for hydrogen sulfide corrosion resistant hardened and tempered high-strength steel plate

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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