Carbon manganese low-temperature steel for liquefied gas boat and manufacturing method of carbon manganese low-temperature steel

A technology for a liquefied gas ship and a manufacturing method, applied in the field of alloy steel manufacturing, can solve the problems of high cost, poor safety, and high alloy cost, and achieve the effects of reducing alloy cost, high toughness weldability, and high and low temperature toughness.

CN106756527AActive Publication Date: 2017-05-31NANJING IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-05-31

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Abstract

The invention discloses carbon manganese low-temperature steel for a liquefied gas boat and a manufacturing method of the carbon manganese low-temperature steel. The carbon manganese low-temperature steel comprises, by weight, 0.03%-0.08% of C, 0.10%-0.30% of Si, 0.60%-1.30% of Mn, not larger than 0.015% of P, not larger than 0.005% of S, 0.010%-0.080% of Nb, 0.010%-0.060% of Al and the balance Fe and inevitable impurities. The clean steel smelting-continuous casting process is adopted in the method, and a high-purity homogenous continuous casting slab is manufactured; and through two-stage control rolling and control cooling, a wee ferrite and pearlitic structure is obtained. The carbon manganese low-temperature steel for the liquefied gas boat has the beneficial effects that the steel is pure, the texture is even, the grain size is in the 10.0 level to 13.5 level, and the ductile-brittle transition temperature is lower than -80 DEG C; building requirements of a cargo tank and a boat body structure of the liquefied gas boat are met; and meanwhile, the carbon manganese low-temperature steel has the beneficial effects of being simple in chemical component and low in cost.
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Description

technical field

[0001] The invention belongs to the field of alloy steel manufacturing, and relates to a carbon-manganese low-temperature steel for liquefied gas ships and a manufacturing method thereof. Background technique

[0002] Liquefied petroleum gas (LPG for short) is widely used for its convenient use, cleanliness and less pollution. With the continuous rapid development of my country's economy, the gradual improvement of people's living standards, the rapid growth of urban population and the enhancement of environmental protection awareness, the demand for LPG has grown rapidly, and it has become the third largest liquefied gas consumption market in the world. As the domestic production lags far behind the demand, the import volume has greatly increased, and accordingly, the LPG shipping market has also developed accordingly. LPG ships mainly transport petroleum hydrocarbons with propane and butane as the main components or a mixture of the two, including propylen...

Examples

Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the present invention, rather than all the embodiments.

[0025] The steel slabs of the embodiments of the present invention are produced by converter smelting, LF refining, and continuous casting. There are 3 examples of chemical composition, and the chemical composition is shown in Table 1.

[0026] The manufacturing method includes the following steps:

[0027] Smelting and casting process: use converter or electric furnace for smelting, continuous casting for casting; target sulfur ≤ 0.005% after desulfurization of molten iron, converter smelting to prevent the end point from returning to S, strictly do a good job in converter tapping to prevent slag, LF furnace adopts white slag operation, refining total The time is guaranteed to be ≥30 minutes, and the RH high vacuum degree is ≤5.0mbar to main...