Nickel-free LPG ship steel plate and manufacturing method thereof

Abstract

The invention discloses a nickel-free LPG ship steel plate and a manufacturing method thereof, and belongs to the technical field of high-strength structural steel. The steel plate is prepared from, by mass percent, 0.18%-0.24% of C, 0.10%-0.19% of Si, 16.1%-18.9% of Mn, not larger than 0.012% of P, 0.15%-0.35% of Mo, 0.10%-0.25% of Re and the balance Fe and inevitable impurities. The yield strength of the steel plate is larger than or equal to 410 MPa, the impact absorbing energy at the temperature of -15 DEG C is larger than or equal to 66 J, the good low-temperature mechanical property is achieved, and 5Ni steel and 9Ni steel can be replaced; and the nickel-free LPG ship steel plate is used for building LPG storage tanks and related structural members with low cost.

Description

technical field [0001] The invention belongs to the technical field of high-strength structural steel, and in particular relates to a nickel-free LPG marine steel plate and a manufacturing method thereof. Background technique [0002] With the maturity of marine energy mining technology, the use of liquefied petroleum gas (LPG) is increasing and the scope of use is becoming wider and wider. Storage and transportation of these liquid energy requires low-temperature mechanical properties, especially steel with excellent low-temperature toughness to build storage tanks. , to ensure that the storage tank will not be brittle and cracked in the low temperature environment, and run safely. Traditional storage tank steel for low-temperature energy is usually constructed of 9Ni series steel. Since the alloying element Ni is a scarce resource, the production cost is high. [0003] And existing Ni-free low-temperature steel also has different defects, for example: the invention of app...

AI Technical Summary

Problems solved by technology

Traditional storage tank steel for low-temperature energy is usually constructed of 9Ni series steel. Since the alloying element Ni is a scarce resource, the production cost is high

[0003] And existing Ni-free low-temperature steel also has different defects, for example: the invention of application number is CN89104759.X discloses a kind of " iron-manganese-aluminum-carbon austenitic non-magnetic steel and low-temperature steel ", The content of Al in the steel involved in this technology is as high as 2.3-3.2%, and it is easy to oxidize to form Al 2 o 3 Molten steel has high viscosity and poor fluidity, which increases the difficulty of production. It is difficult to guarantee the quality of cast slab and steel plate surface quality, and the yield is low.

[0004] The invention with the application number 201710865933.0 discloses "high manganese steel plate for ultra-low temperature environment and its production method". The disadvantage of this technology is that 0.2 to 1.2% Cu is added to the steel, but there is no addition of alloying elements to inhibit Cu-induced hot cracking Ni, thus forming Cu thermal cracks in the mass production process, reducing the yield and increasing the production cost

[0005] The invention with the application number 201710971086.6 discloses "a low yield ratio high toughness high manganese steel plate and its production method". The steel involved in this technology is added with 3.0-4.0% Cr, and Cr is a carbide-forming element If the addition amount is high, it is easy to form multiple types of carbides in the production process, and they are located at the grain boundaries, which deteriorates the performance of intermediate products and finished products, especially sharply reduces the low temperature toughness

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