X120 pipeline steel with low crack sensitivity and high toughness and manufacturing method thereof

A manufacturing method and sensitive technology, applied in the field of low crack sensitivity and high toughness X120 pipeline steel and its manufacturing field, can solve the problems of strict production process control requirements, high alloy composition design of pipeline steel, unfavorable mass production, etc. Moderate process requirements, favorable for large-scale production, and low alloy costs

Inactive Publication Date: 2010-02-17
WUHAN IRON & STEEL (GROUP) CORP +1
View PDF0 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that X120 grade pipeline steel has high alloy composition design and strict production process control requirements, which is not conducive to large-scale production, and provides a kind of alloy with less ad

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • X120 pipeline steel with low crack sensitivity and high toughness and manufacturing method thereof
  • X120 pipeline steel with low crack sensitivity and high toughness and manufacturing method thereof
  • X120 pipeline steel with low crack sensitivity and high toughness and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] The present invention will be further described below: the ingredients and weight percentages of the examples are shown in Table 1; production process:

[0042] 1) Smelting: hot metal desulfurization-converter top and bottom combined blowing-ladle furnace treatment-vacuum (Si-Ca) treatment-pouring into slab;

[0043] 2) Heating the continuous casting slab to 1100~1250℃;

[0044] 3) Carry out rough rolling: control the end temperature of rough rolling at 1000~1100℃;

[0045] 4) Perform finishing rolling: control the finishing temperature of finishing rolling at 800~900℃;

[0046] 5) The steel plate stays for 10 to 60 seconds;

[0047] 6) Cooling: The cooling rate is controlled at 10-30°C / sec, and the final cooling temperature is controlled at ≤450°C.

[0048] The specific process parameters are shown in Table 2; the mechanical properties of the examples are shown in Table 3.

[0049] Table 1 The chemical composition of Examples 1 to 5 (wt%)

[0050] C

[0051]

[0052] Table 2 Ro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses X120 level pipeline steel with low crack sensitivity and high toughness and a production method. The X120 level pipeline steel comprises the following designed components (wt%): 0.02-0.08wt% of C, 1.5-2.1wt% of Mn, at most 0.5wt% of Si, at most 0.018wt% of P, at most 0.0020wt% of S, 0.01-0.02wt% of Ti, 0.04-0.11wt% of Nb, at most 0.08wt% of V, 0.0030wt% of B, 0.01-0.04wt% of Als, 0.1-0.40wt% of Mo, 0.3-0.5wt% of Ni, at most 0.40wt% of Cu, at most 0.30wt% of Cr and the balance of Fe and unavoidable filth. The invention meets the following formulae: the sum of Mo, Ni, Cuand Cr is smaller than or equal to 1.4 and the sum (Pcm) of C, Si/30, (Mn+Cu+Cr)/20, Ni/60, Mo/15, V/10 and 5B is smaller than or equal to 0.23; and the production method comprises the following steps: smelting; heating a continuous casting blank to 1,100-1,250 DEG C; roughly rolling and controlling the finishing temperature at 1,000-1,100 DEG C; finely rolling and controlling the finishing temperature at 800-900 DEG C; resting a steel plate for 10-60 seconds; and cooling with the final coldness temperature of at most 450 DEG C. The invention has little content of the added alloy as well as low cost and crack sensitivity of the steel plate and is beneficial to large-scale production.

Description

technical field [0001] The invention relates to steel for oil and gas pipelines and a production method thereof, in particular to X120 grade pipeline steel with low crack sensitivity and high toughness and a production method thereof. Background technique [0002] In order to save the construction investment of pipeline engineering and reduce transportation costs, it is more economical and reasonable to use high-strength grade pipeline steel. With the increase of pipeline transportation pressure, the requirements for the reliability of pipeline steel are getting higher and higher, that is, high strength, high low temperature crack arrest toughness and good welding performance are required. At present, X70 and X80 pipeline steels have been widely used in various oil and gas pipeline projects, but the pipeline construction and operation costs are relatively high. In order to further reduce the cost of pipeline construction and operation, people have developed X100 and X120 gr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22C38/58C22C38/54C22C38/50C22C38/16C22C38/14C21C1/02C21C5/30C21C7/10C21D8/02B21B37/74
Inventor 郭斌郑琳徐进桥刘静贾娟董中波
Owner WUHAN IRON & STEEL (GROUP) CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap