Steel for sulfur-resistant gas cylinder pipe and manufacturing method of steel

Abstract

The invention discloses steel for a sulfur-resistant gas cylinder pipe. The steel is prepared from the chemical components in percentage by mass: 0.29%-0.31% of C, 0.20%-0.30% of Si, 0.80%-0.90% of Mn, 1.00%-1.10% of Cr, 0.25%-0.30% of Mo, 0.15%-0.20% of Ni, 0.025%-0.035% of Nb, 0.08%-0.10% of V, less than or equal to 0.015% of P, less than or equal to 0.002% of S, less than or equal to 0.015% ofP+S, less than or equal to 0.008% of As, less than or equal to 0.005% of Sn, less than or equal to 0.005% of Pb, less than or equal to 0.005% of Sb, less than or equal to 0.005% of Bi, less than or equal to 0.00015% of [H], less than or equal to 0.0015% of [O], less than or equal to 0.0050% of [N] and the balance of Fe. Through the components, it can be known that according to the steel for the sulfur-resistant gas cylinder pipe, alloying is conducted through the conventional alloy elements of C, Si, Mn, Cr, Mo and the like, micro alloying is conducted by adding the small amount of V, Ni and Nb, and thus the steel has higher toughness than that of 30CrMo in the standard of the national 'large-volume steel seamless gas cylinder' (GB/T 33145-2016).

Description

technical field [0001] The invention relates to alloy structural steel in the iron and steel industry, in particular to a sulfur-resistant gas cylinder pipe and a manufacturing method thereof. Background technique [0002] Environmental protection is my country's basic national policy. In order to integrate the scattered ecological and environmental protection responsibilities, uniformly exercise ecological and pollution discharge supervision and administrative law enforcement responsibilities, strengthen environmental pollution control, and ensure national ecological security. With the start of the national "Blue Sky Defense War", the development of energy saving, emission reduction and low carbon in the production link has been comprehensively promoted to energy saving, emission reduction and consumption reduction in the field of life. The promotion of "coal-to-gas" and natural gas new energy vehicles has reduced the consumption of coal and oil and reduced environmental p...

AI Technical Summary

Problems solved by technology

However, in order to ensure the low-temperature impact toughness of the gas cylinders produced by this steel, the strength cannot be improved, resulting in large wall thickness and low carrying efficiency; due to the failure to effectively control sulfides, the grain refinement is not enough, resulting in poor corrosion resistance of the gas cylinders. Low service life and high comprehensive use cost

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