Pipeline steel and its ingredient control method

A control method and technology for pipeline steel, applied in the field of pipeline steel and its alloy composition control during its smelting process, can solve problems such as not described in detail, and achieve optimization of production process, reduction of aluminum alloy consumption, reduction of production cost and refractory material. The effect of consumption

Inactive Publication Date: 2009-04-29
ANGANG STEEL CO LTD
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  • Application Information

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Problems solved by technology

However, the specific methods and operating procedures are not described in detail

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Embodiment, its composition mass percent is:

[0025] C 0.05, Si 0.25, Mn 1.63, P≤0.012, S≤0.002, Nb 0.055, V 0.05, Ti 0.015, Mo 0.25, Ni 0.20, Cu 0.20, Als 0.025, N≤0.006, B≤0.0004.

[0026] The process route is: molten iron pretreatment—converter smelting—argon station refining—RH refining—LF refining—feeding Si-Ca line—continuous casting

[0027] Hot metal pretreatment: adopt deep desulfurization, the target of desulfurized hot metal is ≤0.002%, and remove the molten iron slag.

[0028] Converter smelting: special steel scrap with low residual element content is used for steel scrap. Mo-Fe, Cu plates and Ni plates are added into the furnace in advance, the end point control C: 0.05-0.08%, the temperature is 1660-1680 °C; and then blow once more (time less than 1 minute) to tap the steel. During the tapping process, only alloying of Mn is carried out, and the addition of aluminum is prohibited; the addition of manganese alloy is based on 100% alloy yield and the res...

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PUM

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Abstract

The invention relates to a conduit wiring steel and the method for controlling its component, belonging to X70 and conduit wiring steel over this grade and the method for increasing component hit ratio during smelting process. The comprised component and their proportion by weight are as follows: C 0.03- 0.06, Si 0.15-0.30, Mn 1.52-1.68, P<=0.018, S<=0.003, Nb0.05-0.07, V 0.04- 0.06, Ti 0.007-0.024, Mo 0.24-0.29, Ni 0.17-0.22, Cu 0.17-0.22, Als 0.01- 0.045, N<=0.008 and B<=0.005. The process route is as follows: bessemerizing- argon station- RH refining- LF refining- continuous casting- cleaning. The invention combines target component rationally, improves alloying way, controllign component in each process, and stablizes steel component based on reducing production cost and material consumption resistant, and makes comprehensive hit ratio of X70 and conduit wiring steel over this grade reach 100%.

Description

technical field [0001] The invention relates to a pipeline steel and a method for controlling its composition, in particular to a pipeline steel and a method for controlling its alloy composition in the smelting process. Background technique [0002] Pipeline steel is mainly used in the manufacture of crude oil and natural gas pipelines. Due to its special use conditions, the comprehensive properties of steel such as strength, impact toughness, hydrogen-induced cracking (HIC) resistance, H 2 S corrosion resistance, fatigue strength and welding performance have high requirements. [0003] In order to ensure the comprehensive performance of pipeline steel and meet the growing demand for pipeline steel, the manufacturers adopt decarburization and low-carbon tapping methods in the smelting process to improve the toughness and ductility of pipeline steel. Because C is the most economical and effective element to improve the strength of steel, but the increase of C content will r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C21C7/00
Inventor 辛国强李伟东孙群温铁光王荣方恩俊王向辉梁祥远
Owner ANGANG STEEL CO LTD
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