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Method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling

A high-strength and toughness, pipeline steel technology, applied in furnace types, furnaces, heat treatment furnaces, etc., can solve the problems of low strength of pipeline steel plates and low toughness of pipeline steel plates, achieve stable mechanical properties, good plate shape, and improve product quality. Effect

Active Publication Date: 2015-03-25
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a method for producing high-strength and toughness pipeline steel by using spray cooling and laminar flow cooling to solve the problem of low toughness of pipeline steel plates above X80 grade produced by spray cooling and the strength of pipeline steel plates above X80 grade produced by laminar flow cooling Low problem, to achieve the production of high-strength toughness pipeline steel

Method used

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  • Method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling
  • Method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling
  • Method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Example 1: 19.1mm X80 pipeline steel

[0019] 1) CCT curve of steel plate (see image 3 )

[0020] image 3 The cooling rates in the medium are 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 20 and 30°C / s respectively

[0021] 2) According to the CCT curve, when the cooling rate is 30°C / s, the bainite transformation start temperature is 550°C, and the UFC cooling final cooling temperature target is determined to be 600°C, the cooling rate is 30°C / s, and the final cooling temperature in the ACC stage is 450-500 , cooling rate 18°C / s.

[0022] The specific process parameters are as follows:

[0023] Steel plate specification

open cold temperature

cooling method

UFC cooling speed

UFC Final Cooldown

ACC cooling rate

ACC Final Cooling

19.1mm

780

UFC-ACC linkage cooling

30℃ / s

600℃

18℃ / s

450-500

[0024] 3) Design steel plate cooling procedures as follows

[0025] The steel plate is cooled by 8 sets of UFC header...

example 2

[0033] Example 2: 25mm X80 pipeline steel

[0034] 1) CCT curve of steel plate (see Figure 4 )

[0035] 2) According to the CCT curve, the final cooling temperature target of UFC cooling is 600°C, the cooling rate is 25°C / s, the final cooling temperature of the ACC stage is 450-500, and the cooling rate is 15°C / s.

[0036] The process parameters are as follows:

[0037] Steel plate specification

open cold temperature

cooling method

UFC cooling speed

UFC final cooling ACC cooling speed

ACC Final Cooling

25mm

780

UFC+ACC linkage cooling

25℃ / s

600℃15℃ / s

450-500

[0038] 3) Design steel plate cooling procedures as follows

[0039] The steel plate is cooled by 9 sets of UFC headers + 4 sets of ACC headers, and the setting parameters of the linkage cooling procedure are as follows:

[0040]

[0041] 4) Mechanical properties of steel plate

[0042] Yield strength requirement: 530~670MPa

[0043] Tensile strengt...

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Abstract

The invention discloses a method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling, belonging to the technical field of production of medium-thickness plates. The super-cooled austenite continuous cooling transformation (CCT) curve of a steel plate is measured according to the chemical constituents of the steel plate. The steel plate comprises the following chemical ingredients in percentage by weight: 0.045-0.075 percent of C, 0.1-0.3 percent of Si, 1.55-1.85 percent of Mn, 0.045-0.085 percent of Nb, 0.1-0.2 percent of Mo, 0.1-0.3 percent of Ni, 0.01-0.02 percent of Ti and the balance of Fe and inevitable impurities. The method has the advantages that the problems of low toughness of pipeline steel plates of over grade X80 produced by jet cooling and low strength of pipeline steel plates of over grade X80 produced by laminar cooling are solved, and the high-toughness pipeline steel is produced.

Description

technical field [0001] The invention belongs to the technical field of plate production, and in particular relates to a method for producing high-strength and toughness pipeline steel through the linkage of spraying and laminar flow cooling. Background technique [0002] At present, high-level medium and heavy plate rolling mills are generally equipped with jet cooling equipment and laminar flow cooling equipment. The jet cooling equipment has a strong cooling capacity. The speed can reach 20°C / s. Shouqin ultra-fast cooling system (UFC) and laminar flow cooling ACC accelerated cooling system designed by SMS is the representative of jet cooling and laminar cooling system at present. UFC cooling equipment has the characteristics of strong cooling capacity and good cooling uniformity, and can It can better guarantee the strength performance of the steel plate and the shape of the steel plate. The ACC cooling equipment has a moderate cooling capacity for cooling the steel plate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D11/00C21D6/00C21D9/46C22C38/14
Inventor 李群王志勇田鹏
Owner SHOUGANG CORPORATION
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