Deep sea pipeline steel produced based on steckel mill and preparation method thereof

A furnace coil rolling mill and pipeline steel technology, applied in the field of deep-sea pipeline steel and its preparation, can solve problems such as immature deep-sea pipeline steel technology, and achieve the effects of compact equipment, uniform and stable performance, and high production efficiency

Active Publication Date: 2012-03-07
NANJING IRON & STEEL CO LTD
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Problems solved by technology

At present, the technology of producing deep-sea p...

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  • Deep sea pipeline steel produced based on steckel mill and preparation method thereof

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Embodiment Construction

[0031] The chemical composition (wt%) of Examples 1-5 is shown in Table 1.

[0032] The chemical composition (wt%) of table 1 embodiment

[0033] C Si mn P S N Nb Ni Cr Cu Mo Example 1 0.04 0.25 1.52 0.008 0.001 0.0041 0.049 0.16 0.03 0.04 0.10 Example 2 0.04 0.24 1.54 0.007 0.001 0.0042 0.052 0.15 0.02 0.03 0.09 Example 3 0.045 0.15 1.55 0.009 0.001 0.0047 0.052 0.17 0.02 0.03 0.10 Example 4 0.05 0.24 1.51 0.008 0.001 0.0038 0.053 0.17 0.02 0.04 0.09 Example 5 0.05 0.25 1.55 0.009 0.001 0.0043 0.050 0.18 0.03 0.04 0.11

[0034] In the above table 1, the chemical composition balance of each embodiment is Fe and trace impurities.

[0035] Preparation Process:

[0036] Each chemical composition in Table 1 is smelted to obtain molten iron;

[0037] Molten iron pretreatment: The molten iron pretreatment is processed according to the end-point sulfur ≤ 0.002% mode, and t...

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Abstract

The invention relates to deep sea pipeline steel and a preparation method thereof, and in particular relates to deep sea pipeline steel produced based on a steckel mill and a preparation method thereof. The deep sea pipeline steel comprises the following components by weight percent: 0.02-0.06% of C, 0.10-0.30% of Si, 1.3-1.65% of Mn, less than 0.010% of P, less than 0.002% of S, less than 0.006%of N, 0.03-0.06% of Nb, 0.1-0.3% of Ni, less than or equal to 0.3% of Cr, less than or equal to 0.3% of Cu, less than or equal to 0.25% of Mo and the balance of Fe and trace impurities. According to the preparation method, billet steel is heated for 2.5-4 hours at the temperature of 1120 DEG C-1210 DEG C; in the first-stage rolling process, rolling-starting temperature is 1030-1130 DEG C, the final-rolling temperature is ensured between 950 DEG C and1100 DEG C, and deformation is more than 60%; in the second-stage rolling process, rolling-starting temperature is 800-940 DEG C, the final rolling temperature is ensured between 780 DEG and 880 DEG C, and deformation is more than 60%; and the cooling speed is 15-25 DEG C/s, and the final cooling temperature is in a range of 200-500 DEG C. Thepreparation method has low cost and simple process, can be used for producing the deep sea pipeline steel having low yield ratio and high toughness, and is suitable for the steckel mill for large-scale production.

Description

technical field [0001] The invention relates to a pipeline steel and a preparation method thereof, in particular to a deep-sea pipeline steel produced based on a steel-steel rolling mill and a preparation method thereof. Background technique [0002] At present, the exploitation of land oil and gas resources at home and abroad can no longer fully meet the needs of economic development. The global seabed oil and gas resources are very rich, and the exploitation of seabed oil and gas resources has become more and more urgent. Overseas, the exploitation of seabed oil and gas resources develops rapidly, while in China it is relatively slow. The use of pipelines to transport oil and gas has the characteristics of high efficiency, economy, safety, and no pollution. It is considered to be an effective way to transport oil and gas over long distances. Therefore, the development of submarine pipeline steel is very necessary. At present, the technology of producing deep-sea pipeline ...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/16C22C38/58C22C38/48C21D8/02C21D11/00B21B37/74
Inventor 姜金星顾鑫潘中德樊振亚
Owner NANJING IRON & STEEL CO LTD
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