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Nickel-free high-strength low-yield ratio medium manganese low-temperature steel and preparing method thereof

A low-yield-ratio, low-temperature steel technology, which is applied in the field of low-temperature steel and its preparation, can solve problems such as difficult to save nickel and reduce costs, high-strength yield ratio, and difficult to guarantee the safety of steel structures, etc., to achieve alloy cost reduction and cost reduction. Reduced, excellent low temperature toughness effect

Active Publication Date: 2016-07-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, increasing the yield strength of low-temperature steel can undoubtedly expand the scope of application, but if the yield ratio is sacrificed, the safety of the steel structure is difficult to guarantee
Unfortunately, the current low-temperature steel is difficult to meet the characteristics of nickel saving, cost reduction, high strength and low yield ratio at the same time

Method used

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  • Nickel-free high-strength low-yield ratio medium manganese low-temperature steel and preparing method thereof
  • Nickel-free high-strength low-yield ratio medium manganese low-temperature steel and preparing method thereof
  • Nickel-free high-strength low-yield ratio medium manganese low-temperature steel and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This example 1 is a nickel-free high-strength low-yield-ratio medium-manganese low-temperature steel plate with a thickness of 60mm, and its chemical composition and mass fraction are 0.04%C, 5.1%Mn, 0.23%Si, 0.02%Als, and 0.16% Mo, 0.006%S, 0.007%P, and the balance of Fe and impurity elements, the metallographic structure is a tempered ferrite lath bundle + austenite double phase structure, yield strength 609MPa, yield ratio 0.78, elongation The rate is 37%, and the transverse impact energy absorbed in the Charpy impact test at -110°C is 152J.

[0036] The preparation process of the above-mentioned low-temperature steel plate is carried out according to the following steps:

[0037] Put a 320mm thick blank into a heating furnace and heat it to 1050°C for 180 minutes. The chemical composition and mass fraction of the blank are 0.04%C, 5.1%Mn, 0.22%Si, 0.02%Als, 0.16%Mo, 0.006% S, 0.007%P, and the balance Fe and impurity elements;

[0038] Two-stage rolling is carried ...

Embodiment 2

[0042] In this example, the nickel-free high-strength low-yield-ratio medium-manganese low-temperature steel plate with a thickness of 41mm has chemical components and mass fractions of 0.06%C, 4.5%Mn, 0.15%Si, 0.03%Als, and 0.3%Mo, respectively. 0.001%S, 0.009%P, and the balance of Fe and impurity elements, the metallographic structure is a tempered ferrite lath bundle+revolved austenite multiphase structure, the yield strength is 637MPa, the yield ratio is 0.82, and the elongation is 35 %, -110 ℃ Charpy impact test transverse impact energy absorption is 131J.

[0043] The preparation process of the above-mentioned low-temperature steel plate is carried out according to the following steps:

[0044] Put a 280mm thick blank into a heating furnace and heat it to 1120°C and hold it for 120min. The chemical composition and mass fraction of the blank are 0.06%C, 4.5%Mn, 0.15%Si, 0.03%Als, 0.3%Mo, 0.001% S, 0.009%P, and the balance Fe and impurity elements;

[0045] Two-stage rol...

Embodiment 3

[0049] This example is a nickel-free high-strength low-yield-ratio medium-manganese low-temperature steel plate with a thickness of 17mm, and its chemical composition and mass fraction are 0.03%C, 6.0%Mn, 0.20%Si, 0.015%Als, and 0.1%Mo , 0.003%S, 0.006%P, and the balance of Fe and impurity elements, the metallographic structure is a complex phase structure of tempered ferrite lath bundle + rotative austenite, yield strength 654MPa, yield ratio 0.85, elongation 32%, -110 ℃ Charpy impact test transverse impact absorption energy is 120J.

[0050] The preparation process of the above-mentioned low-temperature steel plate is carried out according to the following steps:

[0051] Put a 180mm thick billet into a heating furnace and heat it to 1150°C for 90 minutes. The chemical composition and mass fraction of the billet are 0.03%C, 6.0%Mn, 0.20%Si, 0.015%Als, 0.1%Mo, 0.003% S, 0.006%P, and the balance Fe and impurity elements;

[0052] The heated billet is rolled in two stages, th...

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Abstract

The invention discloses nickel-free high-strength low-yield ratio medium manganese low-temperature steel.The nickel-free high-strength low-yield ratio medium manganese low-temperature steel comprises, by mass, 0.03-0.06% of C, 4.5-6.0% of Mn, 0.15-0.23% of Si, 0.015-0.030% of Als, 0.1-0.3% of Mo, 0.006% or less of S, 0.009% or above of P and the balance Fe and impurity elements.The metallographic structure of the low-temperature steel is a complex-phase structure of tempered ferrite batten beam and a rotation austenite.By means of the alloy design mode that nickel is replaced by manganese and the reasonable rolling and the heating technology, the material acquires superior low-temperature tenacity, and cost is greatly reduced compared with that of other low-temperature steel.Meanwhile, the low-temperature steel further has the remarkable advantages of being high in yield strength and low yield ratio, and therefore the low-temperature steel is wider in application range and higher in structural safety.

Description

technical field [0001] The invention relates to a low-temperature steel and a preparation method thereof, in particular to a nickel-free high-strength low-yield ratio medium-manganese low-temperature steel and a preparation method thereof. Background technique [0002] Cryogenic steel is a general term for steels that are used at low temperatures below -10°C and have sufficient notch toughness. Its development has a history of nearly 100 years, which has strongly promoted the progress of science and technology in the field of low temperature. Low-temperature steel can be roughly divided into four categories, namely low-carbon aluminum-killed steel, low-temperature high-strength steel, nickel-based low-temperature steel and austenitic stainless steel. [0003] Low-carbon aluminum-killed steel is a low-temperature steel with C and Mn as the main elements. It is achieved by reducing the C content, increasing the Mn / C ratio, reducing S, P and other harmful elements, and adding a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C21D8/02
CPCC21D6/005C21D8/0226C21D8/0263C21D2211/001C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 孙超尹雨群李强赵荣贵单以刚
Owner NANJING IRON & STEEL CO LTD
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