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Economical ultralow-temperature steel and preparation method thereof

An ultra-low temperature and economical technology, applied in the field of ultra-low temperature steel, can solve the problems of limiting the application range of ultra-low temperature steel, increasing solution treatment and tempering, and unfulfilled service conditions, so as to achieve twinning-induced plasticity inhibition, improve plasticity, The effect of reducing alloy cost

Inactive Publication Date: 2016-12-14
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Austenitic stainless steels such as 304L and 316L contain a large amount of Cr, Ni and Mn, with a stable austenite phase as the matrix structure, no ductile-brittle transition phenomenon, and excellent low-temperature toughness; but these two ultra-low temperature steels need to add a large amount of Expensive Ni element, so the cost is higher
For example, patent CN104152797A discloses a low-temperature plastic high-manganese steel plate and its processing method. The Mn content is relatively high, which requires additional solid solution treatment and tempering, and the use conditions do not reach the ultra-low temperature environment of -196°C.
In addition, 9Ni steel has high strength but low plasticity, while austenitic stainless steel has high plasticity but low strength, which limits the application range of the two ultra-low temperature steels

Method used

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  • Economical ultralow-temperature steel and preparation method thereof
  • Economical ultralow-temperature steel and preparation method thereof
  • Economical ultralow-temperature steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example is an economical ultra-low temperature steel plate with a thickness of 25mm, and its chemical composition and mass fraction are 0.45%C, 24%Mn, 0.3%Si, 2.5%Cr, 0.5%Cu, 0.04%N, 0.01% %Al, 0.019% P, 0.002% S, and the balance of Fe and impurity elements, austenite structure at room temperature, R p0.2 =435MPa, R m =800MPa, A=57%, -196℃ Charpy impact test KV 2 =126J.

[0031] The preparation of the above-mentioned economical ultra-low temperature steel is carried out according to the following steps:

[0032] Put a 260mm thick blank into a heating furnace and heat it to 1080°C for 180 minutes. The chemical composition and mass fraction of the blank are 0.45%C, 24%Mn, 0.3%Si, 2.5%Cr, 0.5%Cu, 0.04% N, 0.01%Al, 0.019%P, 0.002%S, and the balance of Fe and impurity elements;

[0033] The heated slab is rolled, and the rolling mill reduction procedure is 220mm -208mm -166mm -133mm -106mm -80mm -60mm -45mm -34mm -25mm. The final rolling temperature is 995°C;

[00...

Embodiment 2

[0037] This example is an economical ultra-low temperature steel plate with a thickness of 50mm, and its chemical composition and mass fraction are 0.4%C, 28%Mn, 0.1%Si, 4%Cr, 0.3%Cu, 0.01%N, 0.025% %Al, 0.014% P, 0.01% S, and the balance of Fe and impurity elements, austenite structure at room temperature, R p0.2 =455MPa, R m =880MPa, A=50%, -196℃ Charpy impact test KV 2 =80J.

[0038]The preparation of the above-mentioned economical ultra-low temperature steel is carried out according to the following steps:

[0039] Put a 340mm thick blank into a heating furnace and heat it to 1150°C and hold it for 120min. The chemical composition and mass fraction of the blank are 0.4%C, 28%Mn, 0.1%Si, 4%Cr, 0.3%Cu, 0.01% N, 0.025%Al, 0.014%P, 0.01%S, and the balance of Fe and impurity elements;

[0040] The heated slab is rolled, and the rolling mill reduction procedure is 340mm-290mm-256mm-204mm-164mm-131mm-105mm-84mm-67mm-50mm. The final rolling temperature is 970°C;

[0041] The ...

Embodiment 3

[0044] This example is an economical ultra-low temperature steel plate with a thickness of 12mm, and its chemical composition and mass fraction are 0.3%C, 20%Mn, 0.5%Si, 5.5%Cr, 0.8%Cu, 0.10%N, 0.05% %Al, 0.03%P, 0.004%S, and the balance of Fe and impurity elements, austenite structure at room temperature, R p0.2 =400MPa, R m =840MPa, A=66%, -196℃ Charpy impact test KV 2 =151J.

[0045] The preparation of the above-mentioned economical ultra-low temperature steel is carried out according to the following steps:

[0046] Put a 150mm thick blank into a heating furnace and heat it to 1220°C for 90 minutes. The chemical composition and mass fraction of the blank are 0.3%C, 20%Mn, 0.5%Si, 5.5%Cr, 0.8%Cu, 0.10% N, 0.05%Al, 0.03%P, 0.004%S, and the balance of Fe and impurity elements;

[0047] Rolling the heated slab, the rolling mill reduction regulation is 150mm -128mm -108mm -87mm -69mm -55mm -39mm -27mm -18mm -12mm, and the final rolling temperature is 1030°C;

[0048] The r...

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Abstract

The invention relates to economical ultralow-temperature steel. The economical ultralow-temperature steel is prepared from, by mass percent, 0.3%-0.6% of C, 20%-28% of Mn, 0.1%-0.5% of Si, 2.5%-5.5% of Cr, 0.3%-0.8% of Cu, 0.01%-0.10% of N, 0.01%-0.05% of Al, not larger than 0.03% of P, not larger than 0.01% of S and the balance Fe and inevitable impurity elements. According to the economical ultralow-temperature steel, an austenitic structure is obtained through the heating process, the rolling process and the cooling process, and the usage temperature can reach -196 DEG C. Compared with 9Ni steel, the plasticity of the economical ultralow-temperature steel is remarkably improved; and compared with austenitic stainless steel, strength is remarkably improved, and the alloy cost is greatly reduced.

Description

technical field [0001] The invention relates to a steel for ultra-low temperature, in particular to an economical steel for ultra-low temperature and a preparation method thereof. Background technique [0002] Ultra-low temperature steel refers to steel that can be used at a low temperature below -196°C and has sufficient notch toughness. Currently, the widely used steel types are mainly 9Ni steel and austenitic stainless steel. 9Ni steel greatly reduces the ductile-brittle transition temperature through a high content of Ni, and obtains a multiphase structure of tempered martensite + rotated austenite through heat treatment. The tempered martensite matrix provides higher strength, while the rotated austenite As an absorber of deformation load, celite can hinder the initiation and propagation of deformation cracks, thereby improving low-temperature toughness. Austenitic stainless steels such as 304L and 316L contain a large amount of Cr, Ni and Mn, with a stable austenite p...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/18C22C38/02C22C38/16C22C38/06C21D8/02
CPCC22C38/04C21D6/005C21D8/0226C21D2211/001C22C38/001C22C38/02C22C38/06C22C38/16C22C38/18
Inventor 孙超楚觉非单以刚李强谢章龙刘勇赵荣贵
Owner NANJING IRON & STEEL CO LTD
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