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Low yield ratio and high toughness thick steel plate and manufacturing method thereof

A low-yield-strength ratio, steel plate technology, applied in the low-yield-strength ratio high-strength-tough-thick steel plate and its manufacturing field, to achieve the effects of high yield strength, simple process, and low yield-strength ratio

Inactive Publication Date: 2017-11-03
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The patent with publication number CN103352167A discloses a low-yield-ratio high-strength bridge steel and its manufacturing method. The yield strength of the low-yield ratio high-strength bridge steel is not higher than 600MPa, and can only guarantee -40°C impact toughness

Method used

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  • Low yield ratio and high toughness thick steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Manufacture a steel plate with low yield ratio and high strength and toughness with a thickness of 50mm, proceed according to the following steps:

[0031](1) Heating: Put a 200mm thick blank into a heating furnace and heat it to 1110°C and keep it warm for 120min. The chemical composition and mass percentage of the blank are C: 0.060%, Mn: 5.5%, Si: 0.22%, Al : 0.030%, Mo: 0.15%, Cr: 0.20%, Ni: 0.15%, Ti: 0.010%, S: 0.003%, P: 0.006%, the balance is Fe and unavoidable impurity elements;

[0032] (2) Rolling: The heated billet is rolled, the starting rolling temperature is 1020°C, the final rolling temperature is 845°C, and the rolling mill reduction regulations are formulated according to Table 1:

[0033] Table 1 Example 1 Depressing procedure

[0034] pass

1

2

3

4

5

6

7

8

Feed thickness mm

200

176

155

132

112

89

72

59

Discharge thickness mm

176

155

132

112

89

72

...

Embodiment 2

[0038] Embodiment 2: Manufacturing a steel plate with a low yield ratio and high strength and toughness with a thickness of 70mm, proceed according to the following steps:

[0039] (1) Heating: Put a 200mm thick blank into a heating furnace and heat it to 1115°C and keep it warm for 110min. The chemical composition and mass fraction of the blank are C: 0.065%, Mn: 5.6%, Si: 0.20%, Al: 0.027%, Mo: 0.18%, Cr: 0.22%, Ni: 0.24%, Ti: 0.026%, S: 0.006%, P: 0.010%, the balance is Fe and unavoidable impurity elements;

[0040] (2) Rolling: Roll the heated billet, the starting rolling temperature is 1006°C, the final rolling temperature is 827°C, and the rolling mill reduction regulations are formulated according to Table 2:

[0041] Table 2 Example 2 Depressing procedures

[0042] pass

1

2

3

4

5

6

7

8

Feed thickness mm

200

181

162

143

122

101

86

77

Discharge thickness mm

181

162

143

122

101

86

...

Embodiment 3

[0046] Embodiment 3: Manufacturing a steel plate with low yield ratio and high strength and toughness with a thickness of 80mm, proceed according to the following steps:

[0047] (1) Heating: Put a 320mm thick billet into a heating furnace and heat it to 1150°C and keep it warm for 90 minutes. The chemical composition and mass fraction of the billet are C: 0.073%, Mn: 5.8%, Si: 0.10%, Al: 0.040%, Mo: 0.22%, Cr: 0.27%, Ni: 0.40%, Ti: 0.030%, S: 0.002%, P: 0.008%, the balance is Fe and unavoidable impurity elements;

[0048] (2) Rolling: The heated billet is rolled, the starting rolling temperature is 1005°C, the final rolling temperature is 820°C, and the rolling mill reduction regulations are formulated according to Table 3:

[0049] Table 3 Example 3 Depressing procedures

[0050] pass

1

2

3

4

5

6

7

8

Feed thickness mm

320

282

248

211

179

143

115

95

Discharge thickness mm

282

248

211

179

1...

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Abstract

The invention discloses a low yield ratio and high toughness thick steel plate which comprises the following chemical components, by mass percent, 0.060-0.080% of C, 5.5-6.0% of Mn, 0.10-0.30% of Si, 0.015-0.040% of Al, 0.15-0.30% of Mo, 0.20-0.40% of Cr, 0.15-0.40% of Ni, 0.01-0.03% of Ti, less than or equal to 0.006% of S, less than or equal to 0.010% of P, and the balance Fe and unavoidable impurity elements. The steel plate has high yield strength, low yield ratio, and good low temperature impact toughness. The invention further discloses a manufacturing method of the steel plate. The manufacturing method comprises the steps of heating, rolling and carrying out heat treatment. The manufacturing method simply requires once heat treatment, is simple in process and facilitates production and implementation.

Description

technical field [0001] The invention relates to a steel plate and a manufacturing method thereof, in particular to a thick specification steel plate with low yield ratio, high strength and toughness and a manufacturing method thereof. Background technique [0002] With the continuous improvement of structural material requirements for hulls, bridges, buildings, pressure vessels and offshore platforms, the research and development of high-strength, high-toughness thick-gauge steel plates has received extensive attention. However, there is an obvious problem in high-strength steel plates, that is, it is difficult to reduce the yield-tensile ratio. Yield strength ratio is the ratio of yield strength to tensile strength, which reflects the work hardening ability of the material. The higher the yield ratio, the easier it is for local stress concentration or local large deformation to occur during the deformation process of the steel plate. A small amount of energy absorbed by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/02C22C38/06C22C38/44C22C38/50C21D8/02
CPCC21D8/0226C21D2211/001C21D2211/008C22C38/02C22C38/06C22C38/44C22C38/50C22C38/58
Inventor 孙超李强单以刚王从道党军
Owner NANJING IRON & STEEL CO LTD
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