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A low compression ratio pipeline steel x70 steel plate and its production method

A technology with low compression ratio and production method, which is applied to high-strength and high-toughness pipeline steel X70 steel plate to produce low-compression ratio field, can solve problems such as low impact toughness and inability to meet engineering technical requirements, and achieves improved drop hammer performance, The effect of improving the uniform elongation of the material

Active Publication Date: 2020-12-01
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impact toughness is not high, barely higher than 200J, especially the -10°C DWTT performance is only 50-60%, which cannot meet the engineering technical requirements

Method used

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  • A low compression ratio pipeline steel x70 steel plate and its production method
  • A low compression ratio pipeline steel x70 steel plate and its production method
  • A low compression ratio pipeline steel x70 steel plate and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The chemical composition (wt%) of the low compression ratio pipeline steel X70 hot-rolled flat plate in this example is shown in Table 1.

[0023] Table 1 Chemical composition (wt%) of low compression ratio pipeline steel X70 steel plate

[0024] element C Si mn P S Nb Ti Alt content 0.07 0.20 1.70 0.009 0.003 0.050 0.012 0.035

[0025] The specific parameters of the rolling process and the laminar flow staged cooling process in the production process of the low compression ratio pipeline steel X70 steel plate in this embodiment are shown in Table 2.

[0026] The production process of the low compression ratio pipeline steel X70 steel plate in this embodiment: the reheating temperature is 1250° C., and the furnace time is 3 hours. Two-stage controlled rolling is adopted, rough rolling is rolling in the recrystallization zone for 4 passes, the starting rolling temperature is 1100°C, and the final rolling temperature is 1080°C; the...

Embodiment 2

[0034] The chemical composition (wt%) of the low compression ratio pipeline steel X70 hot-rolled flat plate in this embodiment is shown in Table 4.

[0035] Table 4 Chemical composition (wt%) of low compression ratio pipeline steel X70 steel plate

[0036] element C Si mn Cr P S Nb Ti Alt content 0.05 0.22 1.60 0.20 0.010 0.002 0.052 0.014 0.038

[0037] The production process of the low compression ratio pipeline steel X70 steel plate in this embodiment: the reheating temperature is 1250° C., and the furnace time is 3 hours. Two-stage controlled rolling is adopted, rough rolling is rolling in the recrystallization zone for 4 passes, the starting rolling temperature is 1100°C, and the final rolling temperature is 1085°C; the thickness of the intermediate billet is 69mm, and the finishing rolling is rolling in the non-recrystallization zone for 7 passes. The rolling start temperature was 870°C, and the final rolling temperature was 760...

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Abstract

The invention provides a pipeline steel X70 steel plate in low compression ratio, and a production method thereof. The pipeline steel X70 steel plate in low compression ratio is prepared from the following components in weight percent: C is 0.030-0.080%, Mn is 1.55-1.75%, Si is 0.10-0.40%, S is not more than 0.0050%, P is not more than 0.015%, Nb is 0.035-0.060%, Ti is 0.008-0.025%, V is not morethan 0.10%, Alt is 0.020-0.060%, Cr is not more than 0.30%, Mo is not more than 0.20%, and the balance of Fe and unavoidable impurities. In the production method of the steel plate provided by the invention, the X70 pipeline steel with low compression rate and thick specification is produced in batch by adopting laminar subsection cooling process, and the engineering technical requirement is satisfied.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material engineering, and relates to a low-compression ratio pipeline steel X70 steel plate and its production process, in particular to producing low-compression ratio, high-strength, and high-toughness on the production line of a steckel mill by using a laminar flow segmental cooling process Pipeline steel X70 steel plate. Background technique [0002] Oil and gas pipeline projects require large quantities of X70 pipeline steel, high-grade pipeline steel requires high comprehensive performance, and the compression ratio in the production process is generally greater than 10. Due to the thin casting billet of the steckel rolling mill, the pass rate of drop hammer performance is relatively low when producing thick gauge high-grade pipeline steel, so it cannot be mass-produced. In recent years, with the improvement of smelting level and the increase of rolling equipment capacity, strictly c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/06C22C38/22C22C38/24C22C38/28C22C38/26C22C38/38C21D8/02
CPCC21D8/02C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38
Inventor 李静宇李勇韦弦段贵生曹树卫郭世宝孔徳南管刘辉白锦函何晓波张振申
Owner ANYANG IRON & STEEL
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