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K65 control-rolled steel plate and longitudinal submerged arc welded pipe used in frigid zone and manufacturing method of longitudinal submerged arc welded pipe

A technology of straight seam submerged arc welding and alpine regions, which is applied in manufacturing tools, arc welding equipment, welding equipment, etc. It can solve the problems that the performance cannot meet the requirements and the steel pipe cannot be used in alpine regions, and achieve the effect of ensuring low temperature impact toughness

Active Publication Date: 2016-06-01
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the properties of the base material of the steel pipe, the weld seam of the steel pipe, and the hot zone in the prior art cannot meet the requirements at low temperatures, so that the steel pipe cannot Use in alpine areas

Method used

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  • K65 control-rolled steel plate and longitudinal submerged arc welded pipe used in frigid zone and manufacturing method of longitudinal submerged arc welded pipe
  • K65 control-rolled steel plate and longitudinal submerged arc welded pipe used in frigid zone and manufacturing method of longitudinal submerged arc welded pipe
  • K65 control-rolled steel plate and longitudinal submerged arc welded pipe used in frigid zone and manufacturing method of longitudinal submerged arc welded pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a K65 controlled rolling steel plate with a width of 4355 mm and a thickness of 23 mm.

[0044] The mass percentage of each component of the K65 controlled-rolled steel plate is shown in Table 1:

[0045] Table 1 The mass percentage of each component of the K65 controlled-rolled steel plate in this embodiment

[0046] C

mn

Si

P

S

Mo

Ni

Cr

0.04-0.05

1.60-1.66

0.20-0.24

0.007-0.01

0.001-0.003

0.007-0.008

0.218-0.224

0.223-0.229

Cu

Al

N

B

(V+Nb+Ti)%

Ceq%

Pcm%

Fe

0.132-0.144

0.036-0.041

0.004-0.006

0.0001-0.0002

0.091-0.099

0.39

0.16

margin

[0047] The rolling process parameters are: adopt the steel slab with the mass percentage of each component shown in Table 1, the starting rolling temperature of the intermediate slab is 880-950°C, the finish rolling temperature of the steel plate is 60-70°C above t...

Embodiment 2

[0053] This embodiment provides a K65 controlled rolling steel plate with a width of 4340 mm and a thickness of 27.7 mm.

[0054] The mass percentage of each component of the K65 controlled-rolled steel plate is shown in Table 3:

[0055] Table 3 Mass percentage of each component of K65 controlled-rolled steel plate in this embodiment

[0056] C

mn

Si

P

S

Mo

Ni

Cr

0.04-0.06

1.59-1.65

0.20-0.23

0.006-0.01

0.001-0.003

0.007-0.008

0.211-0.229

0.218-0.227

Cu

Al

N

B

(V+Nb+Ti)%

Ceq%

Pcm%

Fe

0.133-0.147

0.036-0.042

0.004-0.005

0.0001-0.0002

0.086-0.222

0.37-0.41

0.15-0.17

margin

[0057] The parameters of the rolling process are as follows: the steel slabs with the mass percentages of the above components are used, the starting rolling temperature of the intermediate slab is 880-950°C, the final rolling temperature of the steel plate is ...

Embodiment 3

[0063] This embodiment provides a diameter A K65 steel straight seam submerged arc welded pipe with a thickness of 23 mm and a manufacturing method thereof.

[0064] The steel pipe of this example uses the K65 controlled-rolled steel plate obtained in Example 1 as the base material, and has undergone edge milling, pre-bending, JCO forming, pre-welding, internal welding, external welding, the first ultrasonic inspection, and the first X-ray inspection. , mechanical diameter expansion, hydraulic test, chamfering, groove processing, second ultrasonic inspection, second X-ray inspection, magnetic particle inspection of pipe end and appearance quality inspection before forming. in,

[0065] In the edge milling step, the angle of the upper and lower grooves is 35°, the height of the upper groove is 8.0mm, and the thickness of the blunt edge is 6.5mm.

[0066] In the JCO molding step: the entire pressing pass is 27 passes, and the amount of each reduction is 585mm.

[0067] In the ...

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Abstract

The invention discloses a K65 control-rolled steel plate and a longitudinal submerged arc welded pipe used in a frigid zone and a manufacturing method of the longitudinal submerged arc welded pipe, and belongs to the technical field of manufacturing of submerged arc welded pipes. The K65 control-rolled steel plate comprises the following various components in percentages by mass: 0.04-0.08% of C, 1.50-1.75% of Mn, 0.20-0.35% of Si, less than or equal to 0.006% of S, less than or equal to 0.010% of P, less than or equal to 0.23% of Ni, less than or equal to 0.009% of Mo, less than or equal to 0.020% of Ti, 0.025-0.050% of Al, 0.06-0.09% of Nb, less than or equal to 0.01% of N, less than or equal to 0.25% of Cu, 0.10-0.30% of Cr, less than or equal to 0.0005% of B, 0.085-0.224% of V+Nb+Ti, and the balance Fe; Ceq is less than or equal to 0.43, and Pcm is less than or equal to 0.20; and in a microscopic structure of the K65 control-rolled steel plate, the content of bainite is 45-65%, and the content of ferrite is 35-55%. Alloy ingredients and rolling technology parameters of the K65 control-rolled steel plate are optimized, so that the K65 control-rolled steel plate has good low-temperature impact toughness and DWTT performance, and is suitable for manufacturing a K65 steel longitudinal submerged arc welded pipe which is used in the frigid zone, and has the diameter phi equal to 1,422 mm and the wall thickness being 23-27.7 mm, and safe use of the steel pipein the frigid zone is ensured.

Description

technical field [0001] The invention relates to a K65 controlled-rolling steel plate, a straight seam submerged arc welded pipe and a manufacturing method thereof for alpine regions, and belongs to the technical field of submerged arc welded pipe manufacturing. Background technique [0002] With the development of exploration and development of oil and gas resources to remote areas, the construction of transmission pipelines in alpine areas has become a hot spot. In the past, oil and gas pipelines in alpine regions have always adopted the technical route of large diameter and low pressure. The maximum delivery pressure is lower than 9.8MPa, and K60 grade steel pipes are mainly used. In recent years, due to the significant progress made in the development of international oil and gas pipeline technology, the construction of oil and gas pipelines in such areas is also developing towards higher pressure and greater transmission capacity, and the single-pipeline gas transmission...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/38B23K9/18B23P15/00
Inventor 付彦宏刘涛赵波杨玮玮李国鹏张红孙灵丽
Owner BC P INC CHINA NAT PETROLEUM CORP
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