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A kind of normalized manganese series gas cylinder steel and preparation method thereof

A technology of gas cylinder steel and manganese series, which is applied to the field of gas cylinder steel, normalized manganese series gas cylinder steel and its preparation, can solve the problems of unstable mechanical properties of gas cylinders, unreachable yield strength and impact energy, etc.

Active Publication Date: 2020-03-03
CHENGDE JIANLONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the mechanical properties of gas cylinders made of normalized 37Mn steel are unstable, and sometimes the yield strength and impact energy cannot reach the existing technical indicators.

Method used

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  • A kind of normalized manganese series gas cylinder steel and preparation method thereof

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Effect test

Embodiment 1

[0042] A preparation method of normalized manganese series gas cylinder steel, said preparation method comprising the following steps:

[0043] (1) The double slag method is adopted for molten iron and scrap steel, and the slag is poured after the first blowing 4 minutes, and the second blowing 8 minutes is carried out for dephosphorization by re-cutting to obtain dephosphorized molten steel;

[0044] (2) carry out blowing pre-desulfurization to the dephosphorized molten steel that step (1) obtains, add lime 1t, light burnt dolomite 0.5t before desulfurization, use oxygen lance pressure 0.8MPa, blowing lance position 1.2m carry out blowing, ensure The desulfurization rate reaches 30-40%, and then adopts low-drawing carbon and conducts initial adjustment of components to obtain molten steel after blowing;

[0045] (3) Perform LF refining on the molten steel after blowing obtained in step (2), add 50kg of lime and SiC each to the primary electrode, use the third-level current fo...

Embodiment 2

[0048] A preparation method of normalized manganese series gas cylinder steel, said preparation method comprising the following steps:

[0049] (1) The double slag method is adopted for molten iron and steel scrap, and the slag is poured after the first blowing for 2 minutes, and the material is cut again for the second blowing for 15 minutes to dephosphorize to obtain dephosphorized molten steel;

[0050] (2) carry out blowing pre-desulfurization to the dephosphorized molten steel that step (1) obtains, add lime 1t, lightly burnt dolomite 0.5t before desulfurization, use oxygen lance pressure 0.5MPa, blowing lance position 1.5m carry out blowing, ensure The desulfurization rate reaches 30-40%, and then adopts low-drawing carbon and conducts initial adjustment of components to obtain molten steel after blowing;

[0051] (3) Perform LF refining on the molten steel after blowing obtained in step (2), add 50kg of lime and SiC each to the primary electrode, use the third-level cur...

Embodiment 3

[0054] A preparation method of normalized manganese series gas cylinder steel, said preparation method comprising the following steps:

[0055] (1) The double slag method is adopted for molten iron and steel scrap, and the slag is poured after the first blowing for 10 minutes, and the material is cut again for the second blowing for 5 minutes for dephosphorization to obtain dephosphorized molten steel;

[0056] (2) Carry out blowing pre-desulfurization to the dephosphorized molten steel obtained in step (1), add lime 1t, lightly burned dolomite 0.5t before desulfurization, use oxygen lance pressure 1MPa, blowing lance position 0.8m to carry out blowing, ensure desulfurization The rate reaches 30-40%, and then adopts low-drawing carbon and conducts initial adjustment of components to obtain molten steel after blowing;

[0057] (3) Perform LF refining on the molten steel after blowing obtained in step (2), add 50kg of lime and SiC each to the primary electrode, use the third-lev...

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Abstract

The invention provides normalized Mn-series gas cylinder steel and a preparation method thereof. The gas cylinder steel comprises, by mass percentage, 0.36-0.40% of C, 0.17-0.37% of Si, 1.55-1.70% ofMn, 0.25% or less of Cr, 0.10% or less of Mo, 0.05% or less of V, 0.005% or less of S, 0.015% or less of P, 40-100 ppm of N and the balance Fe. According to the normalized Mn-series gas cylinder steeland the preparation method thereof, the production process including a converter, refining (LF and VD) and continuous casting is adopted, the Cr, Mo, V and N elements are added in the gas cylinder steel, the yield strength and impact toughness of the gas cylinder steel in the normalized state are remarkably improved and stabilized through the reasonable slagging system in the refining process, and the later heat treatment cost is saved.

Description

technical field [0001] The invention belongs to the field of special steel manufacturing and relates to a gas cylinder steel, in particular to a normalized manganese gas cylinder steel and a preparation method thereof. Background technique [0002] The most common steel grade of Mn series gas cylinder tubes is 37Mn, the total market demand for gas cylinders of this material exceeds 80%, and it is mainly used in industrial gas cylinders (including medical use). In order to save costs, domestic gas cylinder manufacturers mainly adopt normalizing heat treatment process. At present, the mechanical properties of gas cylinders made of normalized 37Mn steel are unstable, and sometimes the yield strength and impact energy do not reach the existing technical indicators. At present, the types of steel used for gas cylinders are mainly manganese-based (such as industrial gas cylinders) and Cr-Mo-based (such as vehicle-mounted gas cylinders). Since the 1960s, seamless pipes have been ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/18C22C38/22C22C38/24C22C38/38
CPCC22C38/001C22C38/02C22C38/04C22C38/12C22C38/18C22C38/22C22C38/24C22C38/38
Inventor 李诗斌
Owner CHENGDE JIANLONG SPECIAL STEEL