Ultralow-temperature welded alloy steel and production method thereof

Abstract

The invention relates to ultralow-temperature welded alloy steel and the production method thereof. The production method sequentially comprises the following working procedures of: 1) smelting; 2) electroslag remelting; 3) forging; 4) steel rolling; and 5) drawing. The low-temperature impact performance of the ultralow-temperature welded alloy steel is similar to that of the austenitic stainless steel, and even under the welding state, the ultralow-temperature welded alloy steel still has enough high impact property at subzero 196 DEG C as well as good mechanical property and corrosion resistance in various corrosion media.

Description

technical field The invention relates to an ultra-low temperature welding alloy steel and a production method thereof, in particular to a production method of an ultra-low temperature, high-strength fine-grained and better cold and thermoplastic welding material. Background technique With the rapid development of the economy, people's demand for energy is increasing, the consumption of oil and natural gas is increasing rapidly, and related industries such as oil and natural gas exploration, drilling, transportation, and processing are developing rapidly. A large number of nickel 5 steels are used as pressure parts in these industries. According to the requirements of working conditions, especially for the storage of natural gas, they still need to have good plasticity and high low-temperature impact value indicators under the condition of -196°C. For example, the use of nickel 5 steel as a welding material can withstand a low temperature of -156°C and still have good mechani...

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Problems solved by technology

A large number of nickel 5 steels are used as pressure parts in these industries. According to the requirements of working conditions, especially for the storage of natural gas, they still need to have good plasticity and high low-temperature impact value indicators under the condition of -196°C. For example, the use of nickel 5 steel as a welding material can withstand a low temperature of -156°C and still have good mechanical properties. The original maximum is -156°C, but the temperature of the natural gas storage must be below -196°C. 0Cr16Ni60M 0 16W4 can meet the requirements as a storage tank, but if the imported nickel 9 steel plate and the same steel type are used to meet the corresponding matching welding materials required by the storage tank, it cannot meet the cold and thermoplastic performance requirements developed at ultra-low temperatures.

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