Needle ferrichrome-X70 pipeline steel with high crack-arresting toughenss and its production

A manufacturing method and pipeline steel technology, applied in the field of pipeline steel and its manufacturing, can solve the problems of high manufacturing difficulty, increased production cost, low Nb content, etc., and achieve high dynamic tear resistance, crack arrest toughness guarantee, high The effect of crack arrest toughness

Active Publication Date: 2006-03-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents require very low content of P and S in composition (P≤0.003%, S≤0.007), which not only increases the production and manufacturing costs, but also makes the production very difficult and difficult for industrialized production; the Nb content is relatively low
Also, as disclosed in Chinese Patent Publication No. CN1351187A, "A Preparation Method of High Cleanliness, High Strength and Toughness Gas Transmission Pipeline Steel", this patent is similar to the aforementioned patent analysis, focusing on high purity steel, P, S and other content requirements are uniform Very low (S≤0.0008%), P≤0.0015%), increase manufacturing cost, be difficult to industrialized production, also have C content higher, C (0.066-0.086%), Mn content is lower Mn (1.23-1.43%) ), and does not contain Mo

Method used

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  • Needle ferrichrome-X70 pipeline steel with high crack-arresting toughenss and its production
  • Needle ferrichrome-X70 pipeline steel with high crack-arresting toughenss and its production
  • Needle ferrichrome-X70 pipeline steel with high crack-arresting toughenss and its production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0069] 10.3×1550×Cmm X70 pipeline steel hot-rolled coils

[0070] C

mn

Si

S

P

Nb

Ti

V

Mo

Cu

Ni

Alt

N

Ca

0.032

1.46

0.277

0.0015

0.011

0.052

0.021

0.048

0.19

0.21

0.14

0.040

0.0036

0.0034

[0071] Routing:

[0072] LD converter smelting→external refining (RH, LF, Ca wire feeding or Ca powder spraying treatment)→continuous casting→slab finishing→slab reheating→controlled rolling→controlled cooling→coiling

[0073] hot rolling process

[0074] Slab heating temperature: 1191°C;

[0075] End temperature of rough rolling: 960℃;

[0076] Finishing compression ratio: 80%

[0077] Finish rolling termination temperature: 822°C;

[0078] Coiling temperature: 527°C.

[0079] σ 0.5

MPa

σ b

MPa

σ 0.5 / G b

δ 50

%

H V10

CVN-20℃

SA% -15℃ ...

Embodiment B

[0084] Routing:

[0085] LD converter smelting→external refining (RH, LF, Ca treatment)→continuous casting→slab finishing→slab reheating→controlled rolling→controlled cooling→coiling

[0086] hot rolling process

[0087] Slab heating temperature: 1201°C;

[0088] End temperature of rough rolling: 970℃

[0089] Finishing compression ratio: 73%

[0090] Finish rolling termination temperature: 793°C;

[0091] Coiling temperature: 537°C.

[0092] σ 0.5

MPa

σ b

MPa

σ 0.5 / σ b

δ 50 %

H V10

CVN-20℃

SA% -15℃ DWTT

EJ

SA%

530

649

0.82

45

220

334

100

100

[0093] (Note: Both tension and impact are in the direction of 30°, and the size of the CVN impact sample is 10×10×55mm; the transverse cold bending is intact)

[0094] The schematic diagram of its acicular ferrite metallographic structure is shown in Figure ...

Embodiment C

[0096] 14.6×1550×Cmm X70 pipeline steel hot-rolled coils

[0097] Routing

[0098] LD converter smelting→external refining (RH, LF, Ca treatment)→continuous casting→slab finishing→slab reheating→controlled rolling→controlled cooling→coiling

[0099] Other embodiment composition see table 2:

[0100] implement

[0101] Other embodiment hot rolling process parameters are shown in Table 3:

[0102]

[0103] The properties of the X70 pipeline steel coils corresponding to the composition and hot rolling process in the above table are shown in Table 4.

[0104]

[0105] The acicular ferritic X70 pipeline steel of the present invention will be applied in my country's "West-to-East Gas Transmission" gas transmission pipeline project and the subsequent Shaanxi-Beijing Second Line gas transmission pipeline project, Hening gas transmission pipeline project, etc. With the construction of gas transmission pipelines in my country and the world, the invention...

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Abstract

The invention is about the X70 needle ferrite in-line steel, which has the toughness of crack arrest. The percentage composition is C 0.020-0.060,Mn 1.45-1.75,Si 0.100-0.500,S¿Q0.0020,P0.004-0.012,Nb0.050-0.080,Ti0.005-0.025,V0.010-0.060,Mo0.10-0.30,Cu¿Q0.30,Ni¿Q0.30,Ca0.0015-0.0040,N¿Q0.0080,Altotal0.015-0.045. The process is: a. refining by coverter or electric furnace; b. refined outside of the furnace, vacuum degass by RH, desulfurating by LF, Ca treatment; c. continuous metal cast process; d. hot rolling, the terminal temperature of the coarse crushing is 950-1000 Deg C.,the terminal temperature of finish rolling is 780-880 Deg C., the compression ratio of the non-recrystallized region is above 70%; e. batching, temperature is 480-580 Deg C..

Description

technical field [0001] The invention relates to a pipeline steel and a manufacturing method thereof, in particular to an acicular ferrite type X70 pipeline steel with high crack arrest toughness and a manufacturing method thereof. Background technique [0002] With the optimization and adjustment of the energy structure around the world, the demand for natural gas usage has increased, which has promoted the development of natural gas pipelines. Long-distance high-pressure transmission has become one of the main features of today's oil and gas pipelines. Long-distance high-pressure transportation puts forward stricter requirements on the performance of pipeline steel. Considering the operational stability and safety of the pipeline, higher requirements are put forward for the strength and toughness of pipeline steel, especially under the condition of long-distance transportation, it is required to have high crack arrest toughness and welding performance, high strength and hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26
Inventor 郑磊高珊丁建华陆敏胡会军杨晓臻
Owner BAOSHAN IRON & STEEL CO LTD
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