Hot-dip galvanized plate suitable for low-temperature environment for gas meter shell and production method thereof

Abstract

The invention discloses a hot-dip galvanized plate suitable for a low-temperature environment for a gas meter shell. The hot-dip galvanized plate comprises a substrate and a coating, and is characterized in that the substrate comprises the following chemical components of, in percentage by mass, less than or equal to 0.006% of C, less than or equal to 0.01% of Si, 0.08%-0.50% of Mn, less than or equal to 0.010% of P, less than or equal to 0.008% of S, 0.025%-0.060% of Als, 0.03%-0.09% of Ti, 0.0005%-0.0050% of B, less than 0.004% of N, less than 0.004% of O, less than or equal to 0.03% of Cu +Ni +Cr +Mo +Sn +As, and the balance Fe and inevitable impurities; the mass percentage of total aluminum in the coating is controlled to be 0.18%-0.23%; and the hot-dip galvanized steel plate is produced through the processes of steelmaking, hot rolling, acid pickling, cold rolling, annealing, galvanizing and finishing, the produced hot-dip galvanized steel plate has good deep drawability, the yield strength is 130-170 MPa, the tensile strength is 280-300 MPa, the A80 elongation is larger than or equal to 43%, the n value is larger than or equal to 0.21, and the r value is larger than or equalto 2.3, and after the part subjected to deep drawing forming is placed for 5 h at the low temperature of-30 DEG C to-50 DEG C, a shot with the weight of 6 kg is used for freely falling from the position with the height of 1 m to impact the part, the part is not cracked, and the use requirement of the gas meter shell is met.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a hot-dip galvanized sheet suitable for a low-temperature environment for a housing of a gas meter and a production method thereof. Background technique [0002] Gas meters are used to measure natural gas, city pipeline gas, liquefied petroleum gas, etc., and are widely used in domestic and industrial environments. The gas meter casing is used in a complex environment and has high requirements for the meter casing, such as good deep drawing performance, good corrosion resistance, and long service life, especially in low temperature environments (-30°C ~ -50°C). It has a high resistance to low temperature brittleness, which prevents the shell from cracking under the impact of external forces, causing internal damage to the instrument, and even gas leakage, resulting in major safety accidents. Considering the requirements of corrosion resistance, the housing of the gas m...

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Problems solved by technology

This patent is used for oil and gas pipelines, low-temperature gas storage tank LPG, LNG, the patent is low-carbon steel, and contains high-cost alloy elements such as Ni and Cr, the product has high strength, and the formability cannot meet the requirements of deep drawing

[0009] Regarding the existing low-temperature steel patents, (1) mainly low-carbon steel, which is used for natural gas pipelines and low-temperature gas storage tanks, has poor formability, can only be easily deformed, and is not suitable for deep drawing; (2) through heat treatment, Obtain high low temperature resistance; (3) By adding alloy elements such as Ni and Mn, good low temperature resistance can be obtained, but the cost is relatively high; the existing low temperature steel patents do not involve the use of gas instruments, nor do they involve the hot-dip galvanizing process , the current unsystematic method involves the production method of hot-dip galvanized sheet for gas instrument housing suitable for low temperature environment

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