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Production process of non-tempered ocean engineering structure with steel grade over 360MPa

A technology of marine engineering and production process, applied in the field of production process of steel grade non-quenched and tempered marine engineering structural pipes above 360MPa, can solve the problems of increasing the cost of seamless steel pipe production process, etc., to improve market competitiveness, release production capacity, and design scientifically reasonable effect

Inactive Publication Date: 2014-12-24
天津市精成伟业机器制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Restricted by the type of seamless steel pipe production process, this steel grade seamless line pipe cannot reach its performance index through thermomechanical rolling control (TMCP) + accelerated cooling (ACC), and usually needs to be processed offline (offline) or online (online) heat treatment (quenching + tempering) can only be realized, which will increase the process cost of seamless steel pipe production

Method used

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  • Production process of non-tempered ocean engineering structure with steel grade over 360MPa
  • Production process of non-tempered ocean engineering structure with steel grade over 360MPa
  • Production process of non-tempered ocean engineering structure with steel grade over 360MPa

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] Size: 273.1×12.70mm

[0032] chemical composition

[0033] example

C

Si

mn

P

S

Ni

Cr

Mo

Cu

Al

V

Nb

Ti

B

1

0.04

0.20

1.87

0.010

0.006

0.17

0.09

0.09

0.03

0.012

0.005

0.11

0.002

0.00020

[0034] 1) After passing the inspection, the cut-to-length continuous casting slab is heated in the annular heating furnace, and the temperature of the heating furnace is controlled at 1280°C;

[0035] 2) The heated continuous casting round tube billet or round steel ingot raw material is cross-rolled and pierced by a cross-rolling piercer, and the solid hot raw material is pierced into a tubular capillary. The piercing temperature is controlled at 124°C, and the piercing deformation is 3;

[0036] 3) After the perforation, the capillary is then continuously rolled by the MPM continuous rolling mill, the continuous rolling temperature is controlled at 108...

example 2

[0043] Size: 168.3×10.0mm

[0044] chemical composition

[0045] example

[0046] 1) After passing the inspection, the cut-to-length continuous casting slab is heated in the annular heating furnace, and the temperature of the heating furnace is controlled at 1260°C;

[0047] 2) The heated continuous casting round tube billet or round steel ingot raw material is cross-rolled and pierced by a cross-rolling piercer, and the solid hot raw material is pierced into a tubular capillary. The piercing temperature is controlled at 122°C, and the piercing deformation is 3;

[0048] 3) After piercing, the capillary tube is then continuously rolled by the MPM continuous rolling mill. The continuous rolling temperature is controlled at 1050°C, and the deformation of the continuous rolling steel pipe is 1.2;

[0049] 4) Cool down the temperature of the blank pipe after continuous rolling to AC 3 The temperature is below 30°C. Then the steel pipe is reheated to 950°C, deformed by...

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PUM

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Abstract

The invention relates to a production process of a non-tempered ocean engineering structure with steel grade over 360MPa. A low-carbon high-niobium steel design is adopted by the process, a non-tempering process adopting thermal mechanical rolling is adopted, and a non-tempered ocean engineering structural tube with steel grade over 360MPa is realized by modifying a rolling production line. Compared with the conventional offline tempering (quenching and tempering) thermal treatment process, the non-tempering treatment process adopting thermal mechanical-controlled rolling can be used for effectively reducing the cost of the thermal treatment process by 600-800 Yuan / ton; and more importantly, the yield can be greatly released, and market competitiveness at home and abroad of the domestic enterprises is effectively improved.

Description

technical field [0001] The invention relates to an ocean drilling platform, in particular to a production process for a steel-grade non-quenched and tempered ocean engineering structural pipe above 360 ​​MPa. Background technique [0002] The jack-up drilling platform is a very widely used offshore mobile drilling platform. Generally, the platform is supported at the drilling position in the target sea area by three to four lifting legs. When working, the legs and spud cans are inserted into the bottom of the seabed A certain depth to support the drilling platform and maintain stability. Structural seamless steel pipes for marine engineering with a steel grade above 360MPa usually need to have high impact toughness in marine low-temperature service environments (below -20°C). Restricted by the type of seamless steel pipe production process, this steel grade seamless line pipe cannot reach its performance index through thermomechanical rolling control (TMCP) + accelerated co...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C22C38/16C22C38/14C21D8/10
Inventor 田秋成史庆志葛利田军
Owner 天津市精成伟业机器制造有限公司
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