Non-copper and nickel acid resistant pipeline steel X52MS and production method of hot-rolled plate coil thereof

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

Active Publication Date: 2014-10-15
SHOUGANG CORPORATION
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  • 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

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  • Non-copper and nickel acid resistant pipeline steel X52MS and production method of hot-rolled plate coil thereof
  • Non-copper and nickel acid resistant pipeline steel X52MS and production method of hot-rolled plate coil thereof
  • Non-copper and nickel acid resistant pipeline steel X52MS and production method of hot-rolled plate coil thereof

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: at the 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 NACE TM0284-96 standard, provide A solution (containing saturated H 2 5% NaCl + 0.5% CH in S 3 COOH solution, PH=3) and B solution (containing saturate...

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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

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Application Information

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Patent Type & Authority Applications(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
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