CN103643170A - High-strength high-toughness X100 pipeline steel hot-rolled coiled plate and production method thereof - Google Patents

Abstract

The invention relates to a high-strength high-toughness X100 pipeline steel hot-rolled coiled plate and a production method thereof. The coiled plate contains the following components in percentage by weight: 0.03%-0.07% of C, 0.1%-0.2% of Si, 1.8%-2.0% of Mn, at most 0.012% of P, at most 0.0080% of S, at most 0.0060% of N, 0.04%-0.09% of Nb, 0.20%-.40% of Mo, 0.01%-0.02% of Ti, 0.2%-0.5% of Cr, 0.25%-0.6% of Ni, 0.2%-0.5% of Cu, and the balance of iron and inevitable impurities. On the premise of no need of adding Mg for oxide metallurgy, the alloy composition is regulated to reduce the microalloy element content with lower the manufacturing cost; and corresponding controlled rolling and controlled cooling techniques are utilized to produce the X100 pipeline steel product with excellent properties.

Description

A kind of high-strength high-toughness X 100 pipeline steel hot-rolled roll bending and production method thereof

Technical field

The present invention relates to a kind of high-strength high-toughness X 100 pipeline steel hot-rolled roll bending and production method thereof, mainly use and special pipeline engineering construction, there is high strength, high tenacity, low yield strength ratio and the good features such as welding property.

Background technology

Along with the demand to the energy of Economic development continues to increase, for improving pipeline operation efficiency, reducing investment and operation funds, length is apart from line of pipes to high pressure, heavy caliber development, and this just requires pipe line steel to have higher intensity, toughness, better weldability and erosion resistance etc.And along with the progress of metallurgical technology and the development of microalloying pipe line steel, produce there is high strength, high tenacity, good weldability and the pipe line steel of erosion resistance become a reality.Pipeline grade of steel in domestic and international application develops into X70, X80 from X60, is further to reduce pipeline construction cost, and the application of high Grade Pipeline Steel has become the inexorable trend of development, this just promoted pipe line steel to higher grade of steel as rank development such as X100.And X100 pipe line steel is due to its high strength (tension 760MPa, surrender 690MPa), high tenacity (20 ℃ of ballistic work >200J), has quite high production difficulty.

Current disclosed X100 pipe line steel Composition Design has two kinds of thinkings: a kind of thinking is to adopt Oxides Metallurgy Technology, add a small amount of Mg to improve welding property, in US Patent No. 20030217795, Japanese Patent JP2001113374, European patent EP 1020539, in European patent EP 1354973, has all adopted this composition design method although alloy system is separately different with alloy content, this method improves favourable to performance, but has strengthened the complicacy of cost and production.

Another kind of thinking is to adopt to take the mode that C, Mn, Nb be master alloying, adds the alloying elements such as a small amount of V, Ti, B.The high strength X 100 pipeline steel that domestic patent " superhigh strength X 100 pipeline steel and hot rolled plate making process thereof (patent No.: CN200510111857.1A) ", " a kind of high strength X 100 pipeline steel hot rolled slab and production method thereof (patent No.: 200810012150.9) ", a kind of Steckel mill are produced and production technique thereof (patent No.: 200810234506.3) " all belong to this Composition Design thinking.The microalloy element of its Patent CN200510111857.1 is that Nb, V, Ti are also added with Mo, B etc., and the kind of its alloying element is more and alloy amount is larger as Ni≤1.5, Cr≤1.0; It is Nb, V, Ti that patent 200810234506.3 is added microalloy element, although whole not higher containing B alloying element total amount yet, promoted production cost, also improved carbon equivalent simultaneously, unfavorable to weldability.

The general TMCP technique that adopts in the production technique of X100 pipe line steel, the X100 steel that the patent that the patent No. is " 200810012150.9 " is produced, for flat board, does not need to batch; The patent No. be the patent of " 200510111857 " because alloying element is more, non-recrystallization zone start rolling temperature and finishing temperature are lower, cause rolling drag and aligning drag greatly to improve, and production unit is had relatively high expectations, and have strengthened the difficulty that pair rolling is produced.

Summary of the invention

The object of the present invention is to provide a kind of high-strength high-toughness X 100 pipeline steel hot-rolled roll bending and production method thereof, not needing to add on the basis that Mg element carries out Oxide Metallurgy, adjust alloying constituent, reduce microalloy element content to reduce manufacturing cost; By corresponding controlled rolling and Controlled cooling process, produce the X100 pipe line steel product of excellent property.

Concrete technical scheme is as follows:

A high-strength high-toughness X 100 pipeline steel hot-rolled roll bending, contains according to weight percent: C:0.03%～0.07%, Si:0.1%～0.2%, Mn:1.8%～2.0%, P :≤0.012%, S :≤0.0080%, N≤0.0060%, Nb:0.04%～0.09%, Mo:0.20%～.40%, Ti:0.01%～0.02%, Cr:0.2%～0.5%, Ni:0.25%～0.6%, Cu:0.2%～0.5%, other are iron and inevitable impurity element.

Further, also contain 0.015%～0.02% Als.

The production method of above-mentioned high-strength high-toughness X 100 pipeline steel hot-rolled roll bending, comprises the steps:

(1) heating of plate blank, wherein slab heating temperature: 1150 ℃～1250 ℃;

(2) slab rolling;

(3) finish to gauge, wherein finishing temperature: 750 ℃～850 ℃;

(4) cooling, final cooling temperature wherein: 300 ℃～500 ℃, speed of cooling: 10 ℃/s～40 ℃/s.

Further, in step (2), recrystallization zone rolling temperature: 1000 ℃～1150 ℃, non-recrystallization district rolling temperature: 980 ℃～860 ℃.

Compare with currently available technology, the present invention, not needing to add on the basis that Mg element carries out Oxide Metallurgy, adjusts alloying constituent, reduces microalloy element content to reduce manufacturing cost; By corresponding controlled rolling and Controlled cooling process, produce the X100 pipe line steel product of excellent property.Can manufacture experimently out with lower production cost the X100 hot-rolled coil product of excellent property, compare with other pipe line steel of X80 equal strength level, adopt X100 product can reduce the thickness of steel for pipeline construction, reduce pipeline construction cost, there is obvious economic benefit and the social benefit of obtaining.

Accompanying drawing explanation

Fig. 1 is product metallographic structure figure of the present invention

Embodiment

Describe the present invention with reference to the accompanying drawings below, it is a kind of preferred embodiment in numerous embodiments of the present invention.

Embodiment 1:

According to X100 pipe line steel high strength, high tenacity, low yield strength ratio and need the index requests such as good welds performance, the chemical component weight per-cent of design is: C:0.03%～0.07%, Si:0.1%～0.2%, Mn:1.8%～2.0%, P :≤0.012%, S :≤0.0080%, N≤0.0060%, Nb:0.04%～0.09%, Mo:0.20%～.40%, Ti:0.01%～0.02%, Cr:0.2%～0.5%, Ni:0.25%～0.6%, Cu:0.2%～0.5%, can contain 0.015%～0.02% Als, other are iron and inevitable impurity element.

Hot-rolled process parameter is: slab heating temperature: 1150 ℃～1250 ℃; Recrystallization zone rolling temperature: 1000 ℃～1150 ℃; Non-recrystallization district rolling temperature: 980 ℃～860 ℃; Finishing temperature: 750 ℃～850 ℃; Final cooling temperature: 300 ℃～500 ℃; Speed of cooling: 10 ℃/s～40 ℃/s.

According to composition and the related process of this patent design, the performance index of its trial product are shown in Table 1.

The mechanical property of table 1 high-strength high-toughness X 100 pipeline steel hot-rolled roll bending

Note: 1) tension impact sampling is horizontal along steel plate, wherein stretching and getting bar-shaped specimen size is diameter 10mm, gauge length 0mm; Charpy bar is of a size of 10 * 10 * 55mm;

2) transverse cold bending is 180 °, d=2a, and performance is qualified.

Embodiment 2:

The chemical composition of high-intensity high-tenacity X100 pipe line steel requires to be shown in Table 2.

The chemical composition of the X100 pipe line steel of table 2 design requires (wt%)

Concrete processing parameter is as follows:

(1) slab heating temperature: 1150 ℃～1250 ℃;

(2) recrystallization zone rolling temperature: 1000 ℃～1150 ℃;

(3) non-recrystallization district temperature temperature: 980 ℃～860 ℃;

(4) finishing temperature: 750 ℃～850 ℃;

(5) final cooling temperature: 300 ℃～500 ℃;

(6) speed of cooling: 10 ℃/s～40 ℃/s;

By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.

Claims (4)

1. a high-strength high-toughness X 100 pipeline steel hot-rolled roll bending, is characterized in that, according to weight percent, contains: C:0.03%～0.07%, Si:0.1%～0.2%, Mn:1.8%～2.0%, P :≤0.012%, S :≤0.0080%, N≤0.0060%, Nb:0.04%～0.09%, Mo:0.20%～.40%, Ti:0.01%～0.02%, Cr:0.2%～0.5%, Ni:0.25%～0.6%, Cu:0.2%～0.5%, other are iron and inevitable impurity element.

2. high-strength high-toughness X 100 pipeline steel hot-rolled roll bending as claimed in claim 1, is characterized in that, also contains 0.015%～0.02% Als.

3. the production method of high-strength high-toughness X 100 pipeline steel hot-rolled roll bending as claimed in claim 1 or 2, is characterized in that, comprises the steps:

(1) heating of plate blank, wherein slab heating temperature: 1150 ℃～1250 ℃;

(2) slab rolling;

(3) finish to gauge, wherein finishing temperature: 750 ℃～850 ℃;

(4) cooling, final cooling temperature wherein: 300 ℃～500 ℃, speed of cooling: 10 ℃/s～40 ℃/s.

4. the production method of high-strength high-toughness X 100 pipeline steel hot-rolled roll bending as claimed in claim 3, is characterized in that, in step (2), and recrystallization zone rolling temperature: 1000 ℃～1150 ℃, non-recrystallization district rolling temperature: 980 ℃～860 ℃.

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