Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Copper-nickel-free acid-resistant pipeline steel x52ms and its hot-rolled coil manufacturing method

A technology of hot-rolled coils and manufacturing methods, applied in the field of hot-rolled steel, which can solve the problems of poor product market competitiveness, high price, and high production cost of pipeline steel

Active Publication Date: 2016-06-01
SHOUGANG CORPORATION
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The applicant of the present invention finds that Ni and Cu alloying elements are due to their high prices, so the production cost of pipeline steel is high, and the product market competitiveness is poor

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
  • Copper-nickel-free acid-resistant pipeline steel x52ms and its hot-rolled coil manufacturing method
  • Copper-nickel-free acid-resistant pipeline steel x52ms and its hot-rolled coil manufacturing method
  • Copper-nickel-free acid-resistant pipeline steel x52ms and its hot-rolled coil manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A copper-nickel-free acid-resistant pipeline steel X52MS, comprising the following components in weight percent, C: 0.02-0.06wt%, Si: 0.05-0.35wt%, Mn: 1.0-1.4wt%, P≤0.018wt%, S≤ 0.003wt%, Cr: 0.10~0.50wt%, Ti: 0.005~0.10wt%, Nb: 0.005~0.10wt%, V: 0~0.05wt%, others are Fe and unavoidable trace impurities, the actual smelting time is 6 The percentage by weight of the experimental steel composition used in each numbering is as shown in Table 1:

[0027] Table 1 (unit wt%)

[0028] Numbering

C

Si

mn

P

S

Cr

Alt

V

Nb

Ti

Ceq

Pcm

1

0.0335

0.185

1.07

0.0093

0.001

0.167

0.0329

0.0038

0.0305

0.0135

0.23

0.10

2

0.0321

0.189

1.09

0.0087

0.001

0.157

0.0386

0.0036

0.0296

0.0167

0.23

0.10

3

0.033

0.191

1.1

0.0085

0.0009

0.155

0.0414

0.0033

0.0303

0.0151

0.23

0.10

...

Embodiment 2

[0039] A method for manufacturing copper-free and nickel-free acid-resistant pipeline steel X52MS hot-rolled coils, comprising the steps of:

[0040] (1) molten iron pretreatment, ensure that the content of S is less than wt0.004% in the pretreatment process;

[0041] (2) Converter steelmaking, control the content of S at the end of converter smelting to be less than wt0.006%;

[0042] (3) LF furnace refining, the content of S entering the station is less than wt0.0040%;

[0043] (4) RH furnace refining, the mass fraction of S in the RH furnace is controlled to be 8-12ppm, and the Ca / S ratio is greater than 2.0;

[0044] (5) The slab pouring adopts the full-protection pouring technology, adopts the dynamic soft reduction technology at the end of the solidification of the slab, controls the degree of superheat to 10-30°C, and the casting speed to 0.8-1.6m / min;

[0045] (6) Steel slab finishing, using dynamic light pressing at the end of slab solidification, stable superheat, ...

Embodiment 3

[0056] Carry out the following performance tests on 6 numbered experimental steels:

[0057] Tensile performance test: Rt0.5: 360~530MPa, Rm: ≥ 460MPa, A% ≥ 22;

[0058] Charpy V-notch impact performance test: The test temperature is -20°C, the size of the test steel is 10×10×55mm, the average impact energy of the V-notch sample is ≥300J, and the shear area is 100%.

[0059] DWTT performance test: test temperature -15°C, experimental steel shear area SA≥85%.

[0060] Hardness test: HV10≤240.

[0061] Metallographic structure: the grain size is 10 or finer.

[0062] The specific test results are shown in Table 3.

[0063] table 3

[0064]

[0065] Anti-HIC performance test: 1 / 4, 1 / 2 position and plate edge of the steel plate width of the present invention get a longitudinal sample respectively, test according to NACETM0284-96 standard, provide A solution (containing saturated H 2 5% NaCl + 0.5% CH in S 3 COOH solution, PH=3) and B solution (containing saturated H 2 S ...

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 relates to non-copper and nickel acid resistant pipeline steel X52MS. The non-copper and nickel acid resistant pipeline steel X52MS comprises the following components in percentage by weight: 0.02-0.06 wt% of C, 0.05-0.35 wt% of Si, 1.0-1.4 wt% of Mn, P not greater than 0.018 wt%, S not greater than 0.003 wt%, 0.10-0.50 wt% of Cr, 0.05-0.10 wt% of Ti, 0.005-0.10 wt% of Nb, 0-0.05 wt% of V, and the balance of Fe and inevitable trace impurities. The invention further provides a preparation method of a hot-rolled plate coil of the non-copper and nickel acid resistant pipeline steel X52MS. Part of all Cr is used for replacing original Ni / Cu elements, so that the material cost is largely reduced under the precondition of guaranteeing the material HIC resistance.

Description

technical field [0001] The invention relates to the field of hot-rolled steel, in particular to a copper-nickel-free acid-resistant pipeline steel X52MS and a method for manufacturing the hot-rolled coil. Background technique [0002] At present, during the service of oil and natural gas pipelines, due to cathodic protection, the hydrogen atoms precipitated from the cathode during the electrochemical reaction are immersed in the steel, which easily leads to sulfide stress corrosion (SSCC) and hydrogen-induced cracking (HIC), resulting in pipeline failure. Corrosion and perforation, resulting in economic losses and environmental pollution. [0003] In order to solve such defects, in the prior art, the pipeline steel has the properties of acid corrosion resistance by adding alloy elements, and the alloy elements such as Ni and Cu are often added. [0004] The applicant of the present invention found that Ni and Cu alloying elements have high prices, so the production cost of ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C21D8/02B22D11/16
Inventor 牛涛吴新朗李永东李明朱国森李飞武军宽李海波姜永文高攀杨健代晓莉
Owner SHOUGANG CORPORATION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com