CN101161847B - High-toughness steel for hot-bending pipe and production method of hot-rolled flat plate thereof - Google Patents
High-toughness steel for hot-bending pipe and production method of hot-rolled flat plate thereof Download PDFInfo
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Abstract
本发明提供一种高韧性热煨弯管用钢及其热轧平板的生产方法。该钢的化学成分为(重量百分比)C:0.04%~0.12%、Si:0.10%~0.30%、Mn:1.50%~1.65%、Nb:0.04%~0.08%、Ti:0.008%~0.025%、Ni:0.15%~0.36%、Mo:0.15%~0.45%、Cu:0.15%~0.30%,余量为铁和不可避免的杂质。其热轧平板的生产方法包括冶炼、炉外精炼、连铸,轧钢采用控轧控冷工艺,板坯的加热温度为1160~1220℃,粗轧温度为1010~1150℃,精轧温度为800~950℃,轧后控制冷却速度为15~30℃/s,终冷温度为450~600℃。本发明成分设计合理,与现有技术相比,生产成本可降低15%左右;本发明热轧钢板可获得以贝氏体为主的复合组织,具有良好的低温韧性,其—20℃冲击功大于220J,—15℃DWTT的剪切面积达90%以上,产品屈服强度达520MPa以上,抗张达570MPa以上。本发明钢板经热弯处理后韧性不降低,具有较好的强韧性。
The invention provides a high-toughness steel for hot-simmering pipe bending and a production method of the hot-rolled flat plate. The chemical composition of the steel is (weight percent) C: 0.04% to 0.12%, Si: 0.10% to 0.30%, Mn: 1.50% to 1.65%, Nb: 0.04% to 0.08%, Ti: 0.008% to 0.025%, Ni: 0.15% to 0.36%, Mo: 0.15% to 0.45%, Cu: 0.15% to 0.30%, and the balance is iron and unavoidable impurities. The production method of its hot-rolled flat plate includes smelting, refining outside the furnace, and continuous casting. The steel rolling adopts the controlled rolling and controlled cooling process. The heating temperature of the slab is 1160-1220°C, the rough rolling temperature is 1010-1150°C, and the finish rolling temperature is 800°C. ~950°C, the controlled cooling rate after rolling is 15~30°C/s, and the final cooling temperature is 450~600°C. The composition design of the invention is reasonable, and compared with the prior art, the production cost can be reduced by about 15%; the hot-rolled steel plate of the invention can obtain a composite structure mainly composed of bainite, has good low-temperature toughness, and its -20°C impact energy Greater than 220J, the shear area of -15°C DWTT is over 90%, the yield strength of the product is over 520MPa, and the tensile strength is over 570MPa. The toughness of the steel plate of the invention does not decrease after hot bending treatment, and has better strength and toughness.
Description
技术领域technical field
本发明属于低碳微合金钢的领域,尤其涉及制造高压、大口径石油天然气输送管道热煨弯管钢及其热轧平板的生产方法。The invention belongs to the field of low-carbon micro-alloy steel, and in particular relates to a production method for manufacturing high-pressure, large-diameter oil and gas pipeline hot-simmered bent pipe steel and its hot-rolled flat plate.
背景技术Background technique
弯管是管道上重要的管件产品之一,其在管线上主要起两方面作用,一是根据需要改变管线的方向;另一个是结构力学作用——可以缓冲管线所在地域的地层迁移,地震及外界环境温度变化等附在直管上的拉、压应力和扭矩作用。弯管是管线中承载较为苛刻的结构件之一,在已建成运行的管线中,与弯管有关的管线事故在整个管线事故中占有相当高的比例,由此可见,弯管的综合质量高低是制约管线安全平稳运行的瓶颈之一。Elbow is one of the important pipe fitting products on the pipeline. It mainly plays two roles on the pipeline. One is to change the direction of the pipeline according to the needs; The tensile and compressive stress and torque attached to the straight pipe due to the change of external environment temperature. The bent pipe is one of the most demanding structural parts in the pipeline. In the pipelines that have been built and operated, the pipeline accidents related to the bent pipe account for a relatively high proportion of the entire pipeline accidents. It can be seen that the comprehensive quality of the bent pipe is high or low. It is one of the bottlenecks restricting the safe and smooth operation of the pipeline.
我国弯管制造采用GB/T12459-1990、SY/T5257-91。现在生产的X70级弯管通常是采用X70级管线钢管做母管,经热煨加工后制成,由于母管是控轧钢设计,经热处理后,其强度和韧性大幅度降低。此外,由于碳含量较低,其它合金元素较多,其生产成本相对也较高。my country's elbow manufacturing adopts GB/T12459-1990 and SY/T5257-91. The X70-grade bent pipe currently produced is usually made of X70-grade pipeline steel pipe as the parent pipe, which is made after hot-simmering processing. Since the parent pipe is a controlled-rolled steel design, its strength and toughness are greatly reduced after heat treatment. In addition, due to the lower carbon content and more other alloying elements, its production cost is relatively high.
日本专利JP2002129288公开了一种高强度弯管及其生产方法,APIX80~100钢包含:C≤0.03%、Si≤0.3%、Mn:0.8%~2.5%、P≤0.015%、S≤0.005%、Nb:0.01~0.05%、Ti:0.005~0.030%、Al≤0.05%、N:0.001~0.06%,以及其它任意金属Ni:0.01~1.0%、Cu:0.1~1.2%、Cr:0.1~1.0%、V:0.01~0.10%、Ca:0.001~0.005%、Mg:0.0001~0.002%,其余为铁。原料钢管在800~1000℃热轧,弯曲然后淬火,得到最终弯管产品。该专利技术由于碳含量较低,其它合金元素较多,生产成本较高,而且不包括X70级弯管。Japanese patent JP2002129288 discloses a high-strength bent pipe and its production method. APIX80-100 steel contains: C≤0.03%, Si≤0.3%, Mn: 0.8%-2.5%, P≤0.015%, S≤0.005%, Nb: 0.01-0.05%, Ti: 0.005-0.030%, Al≤0.05%, N: 0.001-0.06%, and other arbitrary metals Ni: 0.01-1.0%, Cu: 0.1-1.2%, Cr: 0.1-1.0% , V: 0.01-0.10%, Ca: 0.001-0.005%, Mg: 0.0001-0.002%, and the rest is iron. The raw steel pipe is hot-rolled at 800-1000°C, bent and then quenched to obtain the final bent pipe product. Due to the lower carbon content and more other alloying elements, the patented technology has higher production costs, and does not include X70 grade elbows.
发明内容Contents of the invention
本发明的目的在于克服现有技术中的不足,提供一种X70和X80级高韧性热煨弯管用钢和生产该热轧平板的方法。通过调整母管的化学成分,使之适合热处理的需要,在降低成本的同时,取得较好的强化、韧化效果。The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a kind of X70 and X80 high-toughness steel for hot-simmering pipe bending and a method for producing the hot-rolled flat plate. By adjusting the chemical composition of the parent tube to make it suitable for heat treatment, while reducing costs, better strengthening and toughening effects can be achieved.
本发明高韧性热煨弯管用钢的化学成分为(重量百分比)C:0.04%~0.12%、Si:0.10%~0.30%、Mn:1.50%~1.65%、Nb:0.04%~0.08%、Ti:0.008%~0.025%、Ni:0.15%~0.36%、Mo:0.15%~0.45%、Cu:0.15%~0.30%,余量为铁和不可避免的杂质。The chemical composition of the steel for high toughness hot-simmering pipe bending of the present invention is (weight percentage): C: 0.04% to 0.12%, Si: 0.10% to 0.30%, Mn: 1.50% to 1.65%, Nb: 0.04% to 0.08%, Ti: 0.008% to 0.025%, Ni: 0.15% to 0.36%, Mo: 0.15% to 0.45%, Cu: 0.15% to 0.30%, and the balance is iron and unavoidable impurities.
本发明高韧性热煨弯管用钢的热轧平板生产方法包括冶炼、炉外精炼、连铸,轧钢采用控轧控冷工艺,其特征在于板坯的加热温度为1160~1220℃,粗轧温度区间为1010~1150℃,精轧温度区间为800~950℃,轧后控制冷却速度为15~30℃/s,终冷温度区间为450~600℃,之后空冷。The hot-rolled flat plate production method of high-toughness hot-simmered pipe-bending steel of the present invention includes smelting, refining outside the furnace, and continuous casting. The temperature range is 1010-1150°C, the finish rolling temperature range is 800-950°C, the controlled cooling rate after rolling is 15-30°C/s, the final cooling temperature range is 450-600°C, and then air-cooled.
本发明高韧性热煨弯管用钢的成分设计理由:The reason for the composition design of the high toughness hot-simmering steel for bending pipes of the present invention:
碳:随着碳含量增加,钢的强度增加,而韧性、焊接性能降低。但由于控轧控冷工艺和微合金化技术的日趋成熟,同时为改善焊接热影响区(HAZ)的性能,钢中的碳含量逐渐降低,本发明X70、X80级管线热煨弯管钢的碳含量应在0.04%~0.12%为宜。Carbon: As the carbon content increases, the strength of the steel increases, while the toughness and weldability decrease. However, due to the maturation of the controlled rolling and controlled cooling process and microalloying technology, and simultaneously to improve the performance of the welding heat-affected zone (HAZ), the carbon content in the steel gradually decreases. The carbon content should be 0.04% to 0.12%.
锰:有固溶强化作用,还可降低γ-α相变温度,进而细化铁素体晶粒,能同时提高钢的强度和韧性,增加Mn含量可细化晶粒,但若超过1.65%,则出现中心偏析,对铸造性能和冲击韧性产生不利影响;若低于1.50%,则达不到提高强度的目的。Manganese: It has a solid solution strengthening effect, and can also reduce the γ-α phase transition temperature, thereby refining the ferrite grains, which can improve the strength and toughness of the steel at the same time, increasing the Mn content can refine the grains, but if it exceeds 1.65% , center segregation will appear, which will adversely affect casting performance and impact toughness; if it is less than 1.50%, the purpose of improving strength will not be achieved.
硅:是稳定铁素体组织的元素,还能抑制碳化物的形成,该元素在TRIP钢和DP钢中起重要作用,但对API钢而言并非如此。在API钢中,如果提高Si含量,会因形成珠光体而对转变性能和韧性产生不利影响。所以本发明将Si的成分含量限定在0.10%~0.30%。Silicon: It is an element that stabilizes ferrite structure and can also inhibit the formation of carbides. This element plays an important role in TRIP steel and DP steel, but not in API steel. In API steel, if the Si content is increased, it will have an adverse effect on the transformation properties and toughness due to the formation of pearlite. Therefore, the present invention limits the content of Si to 0.10%-0.30%.
铌:可延迟奥氏体再结晶、降低相变温度,通过固溶强化、相变强化、析出强化等机制来获得要求的性能。0.04%~0.08%Nb钢,配合合理的轧制工艺,可以获得均匀的以贝氏体组织为主的复合相和良好韧性。Niobium: It can delay austenite recrystallization, reduce the phase transition temperature, and obtain the required properties through solid solution strengthening, phase transformation strengthening, precipitation strengthening and other mechanisms. 0.04% ~ 0.08% Nb steel, combined with a reasonable rolling process, can obtain a uniform composite phase mainly composed of bainite and good toughness.
钛:添加微量Ti后,脆化温度区消失。这是因为在奥氏体高温区,TiN比Nb(N,C)更易生成,所以N被TiN固定在奥氏体高温区,Nb析出物从Nb(N,C)变成了在奥氏体低温区和γ+α双相区难以析出的NbC。Titanium: After adding a small amount of Ti, the embrittlement temperature zone disappears. This is because TiN is easier to form than Nb(N,C) in the austenite high temperature zone, so N is fixed by TiN in the austenite high temperature zone, and Nb precipitates change from Nb(N,C) to austenite NbC that is difficult to precipitate in the low temperature region and the γ+α dual phase region.
钼:能够降低相变温度、抑制块状铁素体的形成、促进针状铁素体的转变,并能提高Nb(C、N)的沉淀强化效果,这种合金体系的管线钢具有含高密位错的细小贝氏体组织,强度高(达到520MPa),冲击韧性好。在X70管线热煨弯管用钢中,Mo含量在0.15%~0.45%比较理想。Molybdenum: It can reduce the phase transition temperature, inhibit the formation of massive ferrite, promote the transformation of acicular ferrite, and improve the precipitation strengthening effect of Nb (C, N). The pipeline steel of this alloy system has high density Dislocation fine bainite structure, high strength (up to 520MPa), good impact toughness. In the X70 pipeline steel for hot-simmering and bending, the Mo content is ideal at 0.15% to 0.45%.
铜、镍:可通过固溶强化作用提高钢的强度,同时Cu还可改善钢的耐蚀性,Ni的加入主要是改善Cu在钢中易引起的热脆性,且对韧性有益。在厚规格弯管用钢中还可补偿因厚度的增加而引起的强度下降,本发明铜含量选为0.15%~0.30%,镍含量选为0.15%~0.36%。Copper and nickel: the strength of steel can be improved through solid solution strengthening, and Cu can also improve the corrosion resistance of steel. The addition of Ni is mainly to improve the hot brittleness easily caused by Cu in steel, and it is beneficial to toughness. In the steel for thick gauge bent pipes, the strength decrease caused by the increase of thickness can also be compensated. The content of copper in the present invention is selected as 0.15%-0.30%, and the content of nickel is selected as 0.15%-0.36%.
本发明将钢中的杂质元素控制在P≤0.020%,S≤0.003%,在生产可能的情况下,越低越好。The present invention controls the impurity elements in the steel to be P≤0.020%, S≤0.003%, the lower the better if the production is possible.
本发明高韧性热煨弯管用钢的热轧平板生产方法由以下步骤组成:The hot-rolled plate production method of high-toughness hot-simmering steel for pipe bending of the present invention is made up of following steps:
按技术方案配比备料…铁水预脱硫…LD转炉冶炼…炉外精炼…连铸…板坯再加热…控制轧制…控制冷却…矫直…定尺…探伤…精整…检验…入库。Raw material preparation according to the technical plan...Molten iron pre-desulfurization...LD converter smelting...External refining...Continuous casting...Slab reheating...Controlled rolling...Controlled cooling...Straightening...Sizing...Flaw detection...Finishing...Inspection...Storage.
本发明热轧工艺设计:Hot rolling process design of the present invention:
板坯加热温度:板坯加热主要目的是合金元素固溶及奥氏体均匀为后面的轧制变形做准备,加热温度过高,易造成奥氏体晶粒的长大,会影响到钢材的韧性;加热温度过低,合金元素不能充分固溶,达不到合金强化的效果。因此选择的加热温度为1160~1220℃。Slab heating temperature: The main purpose of slab heating is to prepare for the solid solution of alloy elements and uniform austenite for subsequent rolling deformation. If the heating temperature is too high, it will easily cause the growth of austenite grains, which will affect the quality of the steel. Toughness; if the heating temperature is too low, the alloying elements cannot be fully dissolved, and the effect of alloy strengthening cannot be achieved. Therefore, the selected heating temperature is 1160-1220°C.
粗轧温度:粗轧阶段是再结晶轧制阶段,是在再结晶温度以上让奥氏体充分细化,发生再结晶,若温度过低,易造成混晶,本发明将粗轧温度区间设为1010~1150℃。Rough rolling temperature: The rough rolling stage is the recrystallization rolling stage, which is above the recrystallization temperature to make the austenite fully refined and recrystallized. If the temperature is too low, it is easy to cause mixed crystals. The present invention sets the rough rolling temperature range as It is 1010~1150℃.
精轧温度:精轧阶段是未再结晶区轧制阶段,奥氏体沿轧制方向拉长、压扁,晶内产生变形带,这种加工硬化的奥氏体易促进铁素体的形核。温度高,易发生混晶,温度低,进入两相区,有先析铁素体出现,对强韧性不利,所以将精轧温度区间设为800~950℃。这种宽达150℃的精轧温度区间为单张轧制的管线钢热轧平板完成精轧区间的位错积累和随后的晶粒细化任务创造了可能,也适合于管线钢热轧平板精轧期间温降较大的特点。Finish rolling temperature: The finish rolling stage is the rolling stage in the non-recrystallized area. Austenite is elongated and flattened along the rolling direction, and deformation bands are formed in the grain. This work-hardened austenite is easy to promote the formation of ferrite. nuclear. When the temperature is high, mixed crystals are prone to occur, and when the temperature is low, it enters the two-phase region and pro-eutectoid ferrite appears, which is not good for the strength and toughness. Therefore, the finishing temperature range is set at 800-950°C. This finishing temperature range as wide as 150°C creates the possibility for the single-rolled pipeline steel hot-rolled flat plate to complete the dislocation accumulation in the finishing rolling zone and the subsequent grain refinement task, and is also suitable for the pipeline steel hot-rolled flat plate It is characterized by a large temperature drop during finish rolling.
轧后控冷速度:将轧后控制冷却速度设为15~30℃/s,可获得以贝氏体为主的复合组织,具有良好的低温韧性。Controlled cooling rate after rolling: Set the controlled cooling rate after rolling to 15-30°C/s, and a composite structure mainly composed of bainite can be obtained, which has good low-temperature toughness.
终冷温度:终冷温度是控制组织转变产物的区间,温度高,易出现珠光体,造成强度不足,温度低MA相的数量增加,造成韧性下降,因此将终冷温度区间选择为450~600℃。Final cooling temperature: The final cooling temperature is the interval for controlling the transformation products of the tissue. If the temperature is high, pearlite is prone to appear, resulting in insufficient strength. At low temperature, the number of MA phases increases, resulting in a decrease in toughness. Therefore, the final cooling temperature range is selected as 450-600 ℃.
本发明高韧性热煨弯管用钢的成分设计合理,与现有技术相比,其生产成本可降低15%左右;采用本发明方法生产的热轧钢板可获得以贝氏体为主的复合组织,具有良好的低温韧性,其—20℃冲击功大于220J,—15℃DWTT的剪切面积达到90%以上,产品屈服强度可达到520MPa以上的设计要求,抗张可达到570MPa以上的设计要求;本发明复合组织钢板经热弯处理(900~1000℃加热,500~560℃回火)后韧性不降低,具有较好的强韧性。The composition design of the high-toughness steel for hot-simmering pipe bending of the present invention is reasonable, and its production cost can be reduced by about 15% compared with the prior art; Structure, with good low temperature toughness, its -20°C impact energy is greater than 220J, -15°C DWTT shear area reaches more than 90%, the product yield strength can reach the design requirements of 520MPa or more, and the tensile strength can reach the design requirements of 570MPa or more The toughness of the steel plate with composite structure of the present invention does not decrease after hot bending treatment (heating at 900-1000° C., tempering at 500-560° C.), and has good strength and toughness.
附图说明Description of drawings
附图1和附图2分别为本发明高韧性热煨弯管用钢X70和X80的金相组织。Accompanying drawing 1 and accompanying drawing 2 are respectively the metallographic structure of the steel X70 and X80 used for high-toughness hot-bending pipe of the present invention.
具体实施方式Detailed ways
本发明高韧性热煨弯管用钢的6个实施例的化学成分见表1,相应实施例的轧制工艺见表2,其性能检验结果见表3,热煨后的性能见表4。See Table 1 for the chemical composition of six examples of high-toughness steel for hot-simmering pipe bending according to the present invention, see Table 2 for the rolling process of the corresponding examples, see Table 3 for the performance test results, and see Table 4 for the performance after hot-simmering.
表1本发明高韧性热煨弯管用钢的化学成分Table 1 The chemical composition of the steel for high toughness hot-simmering bent pipes of the present invention
表2本发明高韧性热煨弯管用钢的轧制工艺Table 2 The rolling process of steel for high toughness hot-simmering pipe bending of the present invention
表3本发明高韧性热煨弯管用钢的性能Table 3 The performance of steel for high toughness hot-simmering bent pipes of the present invention
表4本发明高韧性热煨弯管用钢热煨后的性能Table 4 Properties of the steel for high toughness hot-simmering bent pipes of the present invention after hot-simmering
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CN103667655B (en) * | 2013-12-10 | 2015-05-27 | 南京钢铁股份有限公司 | Production method of cord thread steel wire rod with diameter of 5mm |
CN103981460A (en) * | 2014-05-30 | 2014-08-13 | 秦皇岛首秦金属材料有限公司 | Hot rolling flat steel for high toughness X80 elbow and production method thereof |
CN107099744A (en) * | 2017-04-01 | 2017-08-29 | 江阴兴澄特种钢铁有限公司 | The X80 bend pipes Pipeline Steel Plate and its manufacture method of a kind of hic resistance |
CN108085593A (en) * | 2017-12-19 | 2018-05-29 | 钢铁研究总院 | Suitable for low temperature environment oil-gas transportation bend pipe and steel for pipe fittings and manufacturing method |
CN108754325A (en) * | 2018-06-14 | 2018-11-06 | 鞍钢股份有限公司 | 560 MPa-level Cu aging hot bending steel plate for pipe and production method thereof |
CN112063925A (en) * | 2020-09-08 | 2020-12-11 | 鞍钢股份有限公司 | 600 MPa-level pipeline structural steel with excellent hot-working performance and production method thereof |
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