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Thick X80 hot rolled coil for phi 1422mm ultra large diameter spiral submerged arc welded pipe and manufacturing method of thick X80 hot rolled coil

A technology of submerged arc welded pipe and super large diameter, which is applied in the field of thick gauge X80 hot-rolled coil and its manufacturing, can solve the problems of DWTT performance not meeting the requirements, high operating system input cost, low single-pass reduction rate, etc. Effects of strain-induced grain boundary migration, excellent tensile properties and low-temperature toughness, and large pass reduction

Active Publication Date: 2018-08-17
BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of the X80 hot-rolled coil produced by the X80 hot-rolled coil and its production method disclosed in the prior art is at most ≤ 15mm, and there are also methods for preparing the X80 hot-rolled coil with a thickness ≥ 18.4mm, but there are alloys High cost, many roughing passes, small reduction rate per pass, high operating system investment cost (new ultra-fast cooling system) or DWTT performance can not meet the requirements and other defects

Method used

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  • Thick X80 hot rolled coil for phi 1422mm ultra large diameter spiral submerged arc welded pipe and manufacturing method of thick X80 hot rolled coil
  • Thick X80 hot rolled coil for phi 1422mm ultra large diameter spiral submerged arc welded pipe and manufacturing method of thick X80 hot rolled coil
  • Thick X80 hot rolled coil for phi 1422mm ultra large diameter spiral submerged arc welded pipe and manufacturing method of thick X80 hot rolled coil

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Embodiment 1~5

[0047] A thick gauge X80 hot-rolled coil for Φ1422mm ultra-large-diameter spiral submerged arc welded pipe. The chemical composition weight percentage of the hot-rolled coil is shown in Table 1. The billet size is 230mm×1650mm, and the hot-rolled coil size is 21.4mm×1550mm.

[0048] Its production process is: KR method stirring pre-desulfurization→LD top-bottom composite blowing→LF deep desulfurization→RH deep degassing→calcium treatment→continuous casting→slab reheating→rough rolling→finish rolling→cooling and coiling after rolling The heating temperature of the casting slab is 1170°C, the thickness of the rough rolling intermediate billet is 65.7mm, the cumulative reduction rate of the finish rolling is 67.5%, and the cooling rate after rolling is 30°C / s. The specific process parameters are shown in Table 2. The reduction rate and distribution law of each pass in the rolling stage are shown in figure 1 .

[0049] Table 1 Weight percentage of chemical composition of hot roll...

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Abstract

The invention discloses a thick X80 hot rolled coil for a phi 1422mm ultra large diameter spiral submerged arc welded pipe and a manufacturing method of the thick X80 hot rolled coil. The X80 hot rolled coil defines the weight percentage cold cracking sensitivity Pcm of various components to be smaller than or equal to 0.20 percent. The X80 hot rolled coil provided by the invention is less in addition amounts of precious metals such as Nb, Mo and Ni and low in alloy cost; a preparation technology optimizes the pressing rate in each pass and a distribution rule thereof of rough rolling and finish rolling; particularly, by performing 3+3 passes of austenite recrystallization rolling, rough rolling is less in pass and large in pass pressing rate, can increase a gamma recrystallization amountto the maximum, prevents strain-induced grain boundary migration to refine grains, is low in investment cost of production equipment and has good tensile property and low-temperature toughness.

Description

technical field [0001] The present invention relates to the technical field of advanced micro-alloy steel, and more specifically relates to a thick gauge X80 hot-rolled coil for a Φ1422mm ultra-large-diameter spiral submerged arc welded pipe and a manufacturing method thereof. Background technique [0002] Since 2008, X80 spiral submerged arc welded pipes have been widely used in the second and third pipeline projects of the West-East Gas Pipeline in my country. The maximum wall thickness of the welded pipes reaches 18.4mm and the diameter reaches Φ1219mm, making my country's pipeline construction a world-class level. At present, X80 has become the preferred steel grade used in my country's new oil and natural gas long-distance pipeline projects. In order to further improve energy transmission volume and efficiency and reduce pipeline transportation costs, the demand for super-large-transport pipeline construction is put forward. Among them, the spiral welded pipe with X80 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/58C22C38/48C22C38/46C22C38/50C22C38/42C22C38/44C22C38/06C21D8/02
CPCC21D8/0226C21D2211/002C21D2211/005C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 高兴健孙磊磊郑磊梅峰司文强陆敏杨晓臻孙震朱蔚林
Owner BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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