Pipeline steel, wide and thick plate, resistant to H2S corrosion, and production method thereof

Abstract

The invention relates to a pipeline steel, wide and thick plate, resistant to H2S corrosion, and a production method thereof. The pipeline steel, wide and thick plate comprises, by weight, 0.018% to 0.068% of C, 0.12% to 0.42% of Si, 0.33% to 0.68% of Mn, not greater than 0.0098% of P, not greater than 0.0098% of S, 0.022% to 0.062% of Nb, 0.009% to 0.021% of Ti, 0.28% to 0.67% of Cr, not greater than 0.32% of Ni, not greater than 0.47% of Cu, 0.013% to 0.057% of Alt, 0.001% to 0.05% of Sn, 0.001% to 0.05% of Sb, one or both of 0.001% to 0.05% of Sn and 0.001% to 0.05% of Sb, and the balance of iron and avoidable foreign. The production method includes the steps of smelting by a blast furnace, pretreatment of molten iron, processing by a converter, refining, vacuum degassing, continuous casting, slab heating, descaling, controlled rolling, controlled cooling and air cooling; heating for hot rolling is at 1150 to 1210 DEG C, final rolling temperature is 800 to 850 DEG C, and final cooling temperature is 450 to 600 DEG C. The low-Mn component design is adopted, Sn or / and Sb are added, no noble metals such as Mo are added, and smelting cost and alloy cost are lowered; by component design and process control, the produced pipeline steel, wide and thick plate, resistant to H2S corrosion, has good comprehensive performances.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a H-resistant 2 S corroded pipeline steel wide and thick plate and its production process. Background technique [0002] In the field of oil and natural gas production, along with the depletion of low-corrosivity shallow well oil and gas resources, the development of highly corrosive high-pressure deep wells has been increasing. Such oil and gas wells contain various corrosive gases, such as H 2 S, CO 2 etc., where H 2 S corrosion is the most serious and dangerous type of corrosion in oil and gas fields, and it will cause extremely serious corrosion to oil and gas well pipes in the production process and pipeline steel in the transportation process. [0003] Hydrogen sulfide corrosion refers to the electrochemical corrosion of steel in aqueous hydrogen sulfide, including hydrogen bubbling (HB), hydrogen-induced cracking (HIC), sulfide stress corrosion cracking (SSCC) and stress-...

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Problems solved by technology

[0004] Patent document CN 1142309C discloses an ultra-low-carbon, high-toughness and hydrogen-sulfide-resistant gas transmission pipeline steel, through ultra-purification and microstructure control to achieve the purpose of anti-hydrogen sulfide corrosion, wherein the S and P content requirements are very low (S<0.0007 %, P<0.003%), which increases the cost and difficulty of steelmaking; patent document CN 100359035C discloses X65 pipeline steel for acidic environment and its manufacturing method. , the cost of the alloy is high, and it only has HIC resistance; the patent document CN 103627974A discloses a production method for improving the resistance to hydrogen-induced cracking of steel plates, adding 3.0-6.0% of Cr, and reducing the amount of precious alloys such as Ni and Mo , but the Cr element has a reverse effect on the corrosion resistance of the steel plate, and the steel only has HIC resistance

In the existing anti-hydrogen sulfide corrosion technology, the requirements for S content are relatively strict, and the difficulty and cost of steelmaking are relatively high; the content of precious metals such as Ni and Mo is high, and the cost of the alloy is relatively high; a large amount of Cr is used to improve corrosion resistance, but the more More and more studies have proved that the Cr element has a reverse effect on the corrosion resistance of steel plates

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