X65 pipeline steel and production method thereof

A production method and technology for pipeline steel, applied in the direction of temperature control, etc., can solve the problems of high steelmaking process requirements, fluctuations in finished product performance, and high Nb content, and achieve the effects of good strength and toughness matching, low cost, and excellent welding performance.

Active Publication Date: 2015-11-18
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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Problems solved by technology

A certain amount of Ti is added to ensure its strength by precipitation strengthening of Ti, but titanium microalloy steel has high requirements on steelmaking process, and the fluctuation of nitrogen content and oxygen content will cause fluctuation of finished product performance
[0006] In patent CN1811002A disclosed X65 pipeline steel for acid environment and its manufacturing method, its chemical composition: C: 0.02-0.05%, Si: 0.10-0.50%, Mn: 1.20-1.50%, P: 0.004-0.012%, S: ≤0.002%, Nb: 0.05-0.07%, Ti: 0.005-0.025%, Mo: 0.050-0.195%, adding a certain amount of Cu and Ni, the X65 pipeline steel produced by this invention is mainly used in acidic environment, and its Nb content High, high production cost

Method used

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Embodiment Construction

[0018] The production process flow of the present invention is: desulfurization of molten iron→converter smelting compound blowing→deoxidation, alloying and desulfurization of high-alkalinity refining slag→replenishing Al wire and Ti microalloying on the small platform behind the furnace→feeding calcium wire→continuous casting→ Slab heating→high pressure water descaling→rough rolling→finish rolling→laminar cooling→coiling→packing and storage.

[0019] X65 pipeline steel, after conventional converter smelting and continuous casting, the chemical composition of the finished steel is: C: 0.065-0.10%, Si: 0.10-0.30%, Mn: 1.40-1.60%, P: ≤0.020%, S: ≤ 0.010%, Nb: 0.030-0.039%, V: 0.06-0.08%, Ti: 0.008-0.020%, and the rest are Fe and unavoidable impurities.

[0020] The preferred scheme is: C: 0.065-0.90%, Si: 0.15-0.25%, Mn: 1.45-1.55%, P: ≤0.018%, S: ≤0.0060%, Nb: 0.035-0.038%, V: 0.06-0.08 %, Ti: 0.011-0.018%, the rest is Fe and unavoidable impurities.

[0021] The production te...

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Abstract

The invention belongs to the technical field of production of hot-continuous-rolled plate strips and particularly relates to X65 pipeline steel and a production method thereof. According to the technical scheme used for solving technical problems, the X65 pipeline steel comprises, by weight, 0.065%-0.10% of C, 0.10%-0.30% of Si, 1.40%-1.60% of Mn, equal to or less than 0.020% of P, equal to or less than 0.010% of S, 0.030-0.039% of Nb, 0.06%-0.08% of V, 0.008%-0.020% of Ti and the balance Fe and inevitable impurities. The X65 pipeline steel and the production method thereof have the characteristics that the cost is relatively low, the rolling technique is simple, and the operability is high. The yield strength of the X65 pipeline steel produced through the method is 480-540 MPa, the tensile strength of the X65 pipeline steel is 600-660 MPa, and the impact energy of the X65 pipeline steel at the temperature of minus 20 DEG C is equal to or larger than 180 J.

Description

technical field [0001] The invention belongs to the technical field of hot continuous rolling strip production, and in particular relates to an X65 pipeline steel and a production method thereof. Background technique [0002] Among the five transportation methods of railway, highway, aviation, water transportation and pipeline, pipeline transportation is an economical, safe and uninterrupted transportation method. Pipeline transportation of oil and gas has the characteristics of high efficiency, economy, safety and no pollution. most efficient tool. With the rapid development of pipeline engineering, the rapid development of pipeline steel production has been driven. The comprehensive performance requirements of pipeline steel are high, such as high strength, high toughness, low ductile-brittle transition temperature, and good welding performance. [0003] Oil and natural gas transmission pipelines are divided into two parts: long-distance pipelines and gathering pipelines ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02B21B37/74
Inventor 张开华叶晓瑜王羿熊雪刚龚慧李卫平
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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