Hydrogen-corrosion-resistant normalized low-alloy steel for mobile tanker and preparation method of hydrogen-corrosion-resistant normalized low-alloy steel

Abstract

The invention relates to hydrogen-corrosion-resistant normalized low-alloy steel for a mobile tanker. The hydrogen-corrosion-resistant normalized low-alloy steel is prepared from the following chemical components: 0.13 to 0.20 percent of C, 0.20 to 0.50 percent of Si, 1.20 to 1.70 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.01 percent of S, 0.10 to 0.45 percent of Ni, 0.010 to 0.050 percent of Nb, 0.010 to 0.20 percent of V, wherein N is greater than or equal to 30ppm and less than or equal to 50ppm, H is less than or equal to 2ppm, w(V) / w(N) is greater than or equal to 8 and less than or equal to 15, and the balance of Fe and converter, refining in a ladle furnace, vacuum treating, continuous casting, heating a cast blank, controlling and rolling, controlling and cooling, slowly cooling, detecting flaws, normalizing, and inspecting performance. A steel plate is delivered at a normalized state, and integrates high strength, high flexibility, low yield ratio and high hydrogen corrosion resistance, on the premise of maintaining the excellent mechanical performance, the thickness of the steel plate is controlled at 6 to 25 mm, a minimum thickness is 6 mm, the weight of the steel material is reduced, and the capacity of the mobile tanker is increased.

Description

technical field [0001] The invention belongs to the technical field of low-alloy high-strength special steel, and relates to a high-strength, high-toughness hydrogen corrosion-resistant steel and a preparation method thereof. Background technique [0002] At present, the tensile strength of the steel used for mobile tankers in China is mostly less than 580MPa, the low-temperature impact toughness value is low, and the yield strength is relatively high, resulting in a large wall thickness of the tank body, a corresponding increase in the self-weight coefficient, a small volume-to-weight ratio, and low carrying efficiency. . On the other hand, the general storage and transportation medium of mobile tanker is liquefied gas, cryogenic liquid and permanent gas, which requires it to have certain corrosion resistance. [0003] The patent application with the patent number CN101144138A discloses a steel plate for low-temperature pressure vessels and its production method. The trans...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the shortcomings of the existing steel for mobile pressure vessels, such as insufficient strength, poor low-temperature impact toughness, poor hydrogen corrosion resistance and high yield strength ratio, the present invention provides a high-strength, high-toughness hydrogen corrosion-resistant steel and a preparation method thereof. The strength of the steel for mobile tank trucks of the present invention is significantly higher than that of steel for traditional mobile pressure vessels. It integrates high strength, high toughness, low yield ratio and excellent hydrogen corrosion resistance, and has strong production operability, low cost, Features such as stable production

Images