X52 seamless pipeline steel pipe with sour corrosion resistance and manufacturing method of X52 seamless pipeline steel pipe

Abstract

The invention discloses an X52 seamless pipeline steel pipe with sour corrosion resistance and a manufacturing method of the X52 seamless pipeline steel pipe. The X52 seamless pipeline steel pipe comprises, by weight percent, 0.08%-0.16% of C, 0.15%-0.35% of Si, 1.0%-1.6% of Mn, 0.021%-0.05% of Al, 0.03%-0.049% of V, 0.21%-0.30% of Cu, 0.21%-0.30% of Ni, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, and the balance iron and inevitable impurities. When C is smaller than or equal to 0.12%, the carbon equivalent CEPcm is smaller than or equal to 0.25%, and when C is larger than 0.12%, CEIIW is smaller than or equal to 0.43. A continuous rolling method is adopted in the manufacturing method of the seamless pipeline steel pipe, in other words, a pipe blank obtained after continuous casting and continuous rolling is heated to 1,200 DEG C-1,300 DEG C through an annular furnace, the temperature ranges from 1,190 DEG C to 1,240 DEG C after punching, and the sizing temperature is controlled to range 820 DEG C to 850 DEG C. The seamless steel pipe is high in economical efficiency and good in corrosion resistance and can be widely applied to the fields of oil and gas well pipeline pipes in the sour corrosion environment and the like.

Description

technical field [0001] The invention relates to the field of corrosion-resistant materials and seamless steel pipes, in particular to a seamless line pipe with anti-HIC and anti-SSC properties and a manufacturing method thereof. Background technique [0002] Hydrogen sulfide (H2S) contained in petroleum and natural gas products in my country 2 S) concentration is higher, the hydrogen sulfide produced is more corrosive, and it is one of the most corrosive and harmful media in oil and natural gas. h 2 Hydrogen-induced cracking (HIC) in pipes caused by S corrosion is one of the main causes of pipe corrosion failure. The mechanism of HIC production is generally considered to be H 2 Hydrogen atoms produced by the electrochemical reaction between the solution formed by dissolving S in water and the metal on the tube wall pass through the metal surface, penetrate deep into the tube body, and gather and combine at the internal defects of the metal (non-metallic inclusions, elemen...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN201210271608.9 discloses "Normalized acid-resistant pipeline steel X52NS hot-rolled coil and its manufacturing method". SSC performance, but the invention is hot-rolled coil

[0004] Chinese patent CN201110138418.5 discloses "X80 steel grade corrosion-resistant low-temperature seamless line pipe", by controlling the chemical composition: C: 0.08% ~ 0.14%, Mn: 1.10% ~ 1.40%, Si: 0.20% ~ 0.35%, P≤0.015%, S≤0.005%, Mo: 0.10%~0.20%, Al: 0.020%~0.060%, Nb: 0.02%~0.05%, V: 0.05%~0.10%, Cu: 0.10%~0.20%, Ni: 0.10%~0.20%, Ti≤0.015%, Cr≤0.15%, Ca: 0.0015%~0.0060%, B≤0.0005%, N≤0.012%, the rest is Fe, the line pipe has corrosion resistance and low temperature impact toughness Excellent, but it adds Ni, Mo, V and other alloying elements, the cost is high, and the patent does not elaborate on the rolling production process

Images