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A kind of preparation method of x80 steel, x80 steel plate and tee
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A technology of steel plate and tee, which is applied in the preparation of X80 steel plate and its tee, in the field of X80 steel, can solve the problems that cannot meet the requirements of X80 steel grade tee
Active Publication Date: 2019-11-12
BC P INC CHINA NAT PETROLEUM CORP +4
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Problems solved by technology
[0009] The invention provides a preparation method of X80 steel, X80 steel plate and tee, which is used to solve the problem that the tee in the prior art cannot meet the technical index of the X80 steel grade tee when the wall thickness reaches 90mm
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preparation example Construction
[0048] The quenching and cooling rate of the preparation method of a X80 steel grade tee provided by the present invention is greater than 5°C / s, quenching and cooling in water, and the quenching cooling rate is greater than 5°C, which can meet the performance requirements of the X80 steel grade tee and the maximum wall thickness Can reach 90mm.
[0049] Water is used as the cooling medium for quenching, which is convenient and much lower in cost than liquid nitrogen as the cooling medium. Compared with salt water such as sodium chloride as the cooling medium, chloride ions will not be introduced to corrode steel.
[0050] The water used in the present invention can be tap water, distilled water or deionized water and the like.
[0051] In actual operation, the cooling rate of the tee in water is 5-15°C / s.
[0052] By using the preparation method of the X80 steel grade tee provided by the invention, the X80 steel grade tee with a diameter of 1016-1422 mm and a wall thickness ...
Embodiment 1
[0055] The composition (percentage by weight) is C 0.14%, Si 0.2%, Mn 0.75%, P 0.008%, S≤0.004%, Cr 0.15%, Mo 0.3%, Cu 0.5%, Ni 0.9%, Nb 0.02%, Ti 0.001 %, V 0.002%, control Mn / C5.4Ni / Cu 1.8, Nb+V+Ti=0.023, Ceq 0.46% of X80 steel made of 42mm thick control-rolled steel plate, pressed into 1016-610mm tee, forming temperature It is 900-1000°C. The final heat treatment process is: quenching temperature 930°C, heating rate 200°C / h, holding time 1 hour, tap water cooling, cooling rate 10°C / s, tempering temperature 650°C, heating rate 100°C / h, holding time 3 hours , air cooled.
[0056] The properties of the tee made in Example 1 are shown in Table 1.
Embodiment 2
[0058] The composition (weight percentage) is C 0.15%, Si 0.25%, Mn 0.9%, P 0.007%, S 0.003%, Cr 0.2%, Mo 0.2%, Cu 0.6%, Ni 0.9%, Nb 0.03%, Ti 0.003% , V 0.005%, control Mn / C6, Ni / Cu 1.5, Nb+V+Ti=0.038, Ceq 0.48% X80 steel made of 70mm thick control-rolled steel plate, pressed into 1219-1016mm tee, forming temperature is 900-1000°C. The final heat treatment process is: quenching temperature 950°C, heating rate 200°C / h, holding time 1 hour, ordinary water cooling, cooling rate 10°C / s, tempering temperature 600°C, heating rate 100°C / h, holding time 3 hours, air-cooled.
[0059] The properties of the tee made in Example 2 are shown in Table 1.
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Abstract
The invention discloses X80 steel, an X80 steel plate and a preparation method of a three-way joint made from the X80 steel. The X80 steel comprises the following elements in percentage by weight: 0.12-0.2% of C, 0.2-0.3% of Si, 0.7-1.0% of Mn, less than or equal to 0.01% of P, less than or equal to 0.005% of S, 0.15-0.35% of Cr, 0.25-0.35% of Mo, 0.5-0.8% of Cu, 0.9-1.1% of Ni, 0.02-0.04% of Nb,less than or equal to 0.01% of Ti and less than or equal to 0.02% of V, wherein a ratio of Mn / C is controlled to be 5-6, a ratio of Ni / Cu is controlled to be 1.3-2, the sum of weigh percents of Nb, Vand Ti is controlled to be less than or equal to 0.05%, and Ceq is controlled to be 0.46-0.55%. The X80 steel provided by the invention provides a raw material for preparing a three-way joint which has the wall thickness not more than 90mm and accords with technical indexes of an X80 grade steel three-way joint.
Description
technical field [0001] The invention relates to the field of iron and steel, in particular to a preparation method of X80 steel, X80 steel plate and tee. Background technique [0002] Pipeline transportation of oil and gas has the advantages of safety, reliability, economy, energy saving and high efficiency compared with other means of transportation. Therefore, with the continuous development of the world's petroleum industry, the construction of oil and gas pipelines around the world is developing rapidly, and its requirements for pipe performance are also increasing. higher. [0003] At present, large-scale tees generally adopt the production process of quenching and tempering after hot pressing with molds on a press. The highest steel grade currently used is X80. [0004] With the increasing demand for natural gas, in order to improve the transmission efficiency, the construction of large pipelines has been developing in the direction of high steel grade, large pipe di...
Claims
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Application Information
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