阅读说明：本技术 一种同时可生产x52及x60级别管线钢的柔性制造方法 (Flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel ) 是由 孔雅 韩启彪 李复磊 胡淑娥 *** 成小龙 侯东华 汪鹏飞 袁婷婷 于 2019-11-05 设计创作，主要内容包括：一种同时可生产X52及X60级别管线钢的柔性制造方法,钢的化学成分的重量百分比为：C：0.04-0.10％,Si：0.10-0.40％,Mn：1.25-1.65％,P≤0.018％,S≤0.005％,Als：0.015-0.050％,Cr：0.10-0.30％,Nb：0.010-0.045％,Ti：0.010-0.030％,PCM≤0.20。其余为Fe和不可避免的杂质。一种同时可生产X52及X60级别管线钢的柔性制造方法,该方法的实施能够有效减少异种成分体系组浇组炉引起的铸坯改判并有利于产品质量提升。(A flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel comprises the following chemical components in percentage by weight: c: 0.04-0.10%, Si: 0.10-0.40%, Mn: 1.25-1.65%, P is less than or equal to 0.018%, S is less than or equal to 0.005%, Als: 0.015-0.050%, Cr: 0.10-0.30%, Nb: 0.010-0.045%, Ti: 0.010-0.030%, PCM is less than or equal to 0.20. The balance of Fe and inevitable impurities. The flexible manufacturing method can simultaneously produce X52 and X60 grade pipeline steel, can effectively reduce casting blank judgment caused by a group casting furnace of a dissimilar component system, and is beneficial to improving the product quality.)

1. A flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel is characterized in that the steel comprises the following chemical components in percentage by weight: c: 0.04-0.10%, Si: 0.10-0.40%, Mn: 1.25-1.65%, P is less than or equal to 0.018%, S is less than or equal to 0.005%, Als: 0.015-0.050%, Cr: 0.10-0.30%, Nb: 0.010-0.045%, Ti: 0.010-0.030%, PCM is less than or equal to 0.20. The balance of Fe and inevitable impurities.

2. The flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel according to claim 1, wherein X52 is produced by a controlled rolling only process, which comprises the following steps: KR desulfurization → converter smelting → LF → RH → CCM → cutting and sizing of casting blank → slow cooling 48h → heating of slab → high pressure water descaling → rolling → straightening → flaw detection → cutting → inspection, spray mark → warehousing.

3. The flexible manufacturing method capable of simultaneously producing pipeline steel of X52 and X60 grades as claimed in claim 1, wherein X60 is produced by controlled rolling and controlled cooling process, which comprises the following steps: KR desulfurization → converter smelting → LF → RH → CCM → cutting and sizing of casting blank → slow cooling for 48h → heating of slab → high pressure water descaling → rolling → water cooling → straightening → flaw detection → cutting → inspection, spray mark → warehousing.

Technical Field

The invention relates to the technical field of flexibility of pipeline steel, in particular to a flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel.

Background

With the increase of petroleum, natural gas and other transportation projects all over the world, the X52 and X60 strength grade pipeline steel is widely applied, the influence of the subsequent welding performance and the Bauschinger effect in the pipe coiling process on the strength is considered in the component design and performance indexes of the pipeline steel plate, and the pipeline steel plate is stricter compared with other steel types and mainly embodies low-carbon equivalent component design and narrow-window process design.

Inevitably, the problem that furnace group pouring is difficult due to special component design, a large amount of blank judgment can be caused, the structure production and the quality stability are not facilitated, and in order to solve the problem, the flexible manufacturing method is invented for the pipeline steel with the strength grade of X52 and X60 with large order quantity, namely, the same component design is adopted to be matched with different production processes to realize the physical performance requirements of different steel types.

Disclosure of Invention

The invention aims to provide a flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel, which can effectively reduce casting blank judgment caused by a group casting furnace of a dissimilar component system and is beneficial to improving the product quality.

The invention provides a flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel, wherein the steel comprises the following chemical components in percentage by weight: c: 0.04-0.10%, Si: 0.10-0.40%, Mn: 1.25-1.65%, P is less than or equal to 0.018%, S is less than or equal to 0.005%, Als: 0.015-0.050%, Cr: 0.10-0.30%, Nb: 0.010-0.045%, Ti: 0.010-0.030%, PCM is less than or equal to 0.20. The balance of Fe and inevitable impurities.

X52 is produced by a controlled rolling process, which comprises the following steps: KR desulfurization → converter smelting → LF → RH → CCM → cutting and sizing of casting blank → slow cooling 48h → heating of slab → high pressure water descaling → rolling → straightening → flaw detection → cutting → inspection, spray mark → warehousing.

X60 is produced by controlled rolling and controlled cooling process, which comprises the following steps: KR desulfurization → converter smelting → LF → RH → CCM → cutting and sizing of casting blank → slow cooling for 48h → heating of slab → high pressure water descaling → rolling → water cooling → straightening → flaw detection → cutting → inspection, spray mark → warehousing.

The invention has the following beneficial effects: the flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel can adopt the same component design and match with different production processes to realize the production of X52 and X60 different grade pipeline steel. X52 is produced by a controlled rolling process, and grain refinement is realized by temperature control in the rolling process so as to meet the strength and toughness indexes of the steel plate; the X60 is produced by adopting a controlled rolling and controlled cooling process, namely block cooling is carried out after the austenite is not recrystallized, and strengthening mechanisms such as substructures in deformed austenite can be kept in the tissues after phase transformation, so that the strength and the low-temperature toughness of the steel are improved. The invention can reduce the problem of billet judgment caused by the group furnace group casting in the smelting process to the maximum extent, and can effectively promote the improvement of product quality and the reduction of production cost.

Detailed Description

A flexible manufacturing method capable of simultaneously producing X52 and X60 grade pipeline steel comprises the following chemical components in percentage by weight: c: 0.04-0.10%, Si: 0.10-0.40%, Mn: 1.25-1.65%, P is less than or equal to 0.018%, S is less than or equal to 0.005%, Als: 0.015-0.050%, Cr: 0.10-0.30%, Nb: 0.010-0.045%, Ti: 0.010-0.030%, PCM is less than or equal to 0.20. The balance of Fe and inevitable impurities.

In order to meet good welding performance, the invention designs a low PCM component system, and simultaneously, in order to ensure the requirements of X52 and X60 grade pipeline steel on strength and low-temperature impact performance, trace alloy elements such as Nb, Cr, Ti and the like are added into the component system, and the addition of trace alloy elements can realize that the blank blocks the growth of original austenite grains when being heated, inhibit recrystallization and the growth of grains after crystallization in the rolling process, play a role of precipitation strengthening at low temperature, and finally realize that the strength and the plastic toughness of the steel plate meet the index requirements, and the method comprises the following steps:

the invention provides two production process routes for simultaneously meeting the performance index requirements of pipeline steel with two strength grades of X52 and X60 by adopting the same component system

X52 is produced by a controlled rolling process, which comprises the following steps: KR desulfurization → converter smelting → LF → RH → CCM → cutting and sizing of casting blank → slow cooling 48h → heating of slab → high pressure water descaling → rolling → straightening → flaw detection → cutting → inspection, spray mark → warehousing.

X60 is produced by controlled rolling and controlled cooling process, which comprises the following steps: KR desulfurization → converter smelting → LF → RH → CCM → cutting and sizing of casting blank → slow cooling for 48h → heating of slab → high pressure water descaling → rolling → water cooling → straightening → flaw detection → cutting → inspection, spray mark → warehousing.