![\"\"](\"https:\/\/www.wldsteel.com\/wp-content\/uploads\/2021\/08\/Hydrogen-sulfide-corrosion-on-steel-pipe.jpg\")
<\/figure><\/div>\n\n\n\nThe factors affecting the corrosion of H\u2082S include hydrogen sulfide concentration, PH value, temperature, flow rate, carbon dioxide and chloride ion (C1-) concentration, etc. A wet hydrogen sulfide stress corrosion environment is constituted if the following conditions are met:<\/p>\n\n\n\n
- Medium temperature is not greater than 60+2P \u2103, P is the medium gauge pressure (MPa);<\/li>
- B partial pressure of hydrogen sulfide is not less than 0.35mpa;<\/li>
- The medium contains water or the medium temperature is lower than the dew point temperature of water;<\/li>
- Medium with PH less than 9 or cyanide.<\/li><\/ul>\n\n\n\n
The results show that for the alloy steel when the strength or hardness of the steel is the same, the microstructure of uniform distribution of small spherical carbides can be obtained by high temperature tempering after quenching, and the resistance to H2S corrosion is better than that after tempering. The shape of inclusions also matters, especially the shape of MnS, because MnS are prone to plastic deformation at high temperatures, and the sheet MnS formed by hot rolling cannot be changed during subsequent heat treatment.<\/p>\n\n\n\n
Elements Mn, Cr and Ni are added to the carbon steel<\/a> to improve the hardenability, especially Ni. It is generally believed that Ni element is beneficial to the toughness of alloy steel, but the hydrogen evolution reaction overpotential of Ni steel is low, the hydrogen ion is easy to discharge and reduce to accelerate the hydrogen precipitation, so the resistance of Ni steel to sulfide stress corrosion is poor. In general, carbon steel and alloy steel should contain less than 1% or no nickel. Elements such as Mo, V, Nb, etc. that form stable carbides in steel.<\/p>\n\n\n\n
ISO 15156-2, ISO15156-3 or NACE MR0175-2003 have limited the environmental conditions to avoid the occurrence of stress corrosion. If these conditions are not met, HIC and SSC tests shall be performed, and other relevant standards shall be met. The American Corrosion Institute (NACE) MR-01-95 states that to prevent sulfide stress corrosion cracking (SSCC), ordinary steel (nickel content less than 1%) with a hardness below Rockwell HRC22 or tempered chrome-molybdenum steel with nickel content less than HRC 26 shall be used.<\/p>\n\n\n\n
In addition, there are other restrictions:<\/p>\n\n\n\n
- Impurities in steel: sulfur \u2264 0.002%, P\u22640.008%, O\u2264 0.002%.<\/li><\/ul>\n\n\n\n
- Hardness is not more than 22HRC, yield strength is less than 355MP, tensile strength is less than 630MPa<\/li><\/ul>\n\n\n\n
- The carbon content of steel should be reduced as much as possible under the condition of satisfying the mechanical properties of steel plate. For Low carbon steel and carbon-manganese steel: CE\u22640.43, CE=C+Mn\/6; For low alloy steel: CE\u2264045 CE=C+Mn\/6+(Cr+Mo+V)\/5+(Ni+Cu)\/15<\/li><\/ul>\n\n\n\n
<\/p>\n\n\n\n
<\/p>\n\n\n\n
Steel plate\uff1aSA387\u00a0Gr11(HlC), SA387\u00a0Gr12(HlC), SA387 Gr22(HlC), SA516 Gr65(HlC), SA516 Gr70(HlC);<\/em><\/p>
Steel pipe: API\u00a05CT\u00a0H40, J55, L55, C75(1,2,3), L80(type 1), N80(type Q\/T), C95(type Q\/T), P105, P110 Q\/T); API 5L<\/a>\u00a0grade A, grade B, X42<\/a>, X46, X52; ASTM A53, A106(A, B, C)<\/em><\/p>The avaiable carbon Steel pipe and plate for H\u2082S application<\/cite><\/blockquote>\n\n\n\n
<\/p>","protected":false},"excerpt":{"rendered":"
Hydrogen sulfide H\u2082S is an inorganic compound that is colorless, flammable, soluble in water acid gas, hydrogen sulfide corrosion refers to the oil and gas pipeline containing a certain concentration of hydrogen sulfide (H2S) and water corrosion.\u00a0\u00a0H\u2082S\u00a0dissolves in water and becomes acidic, leading to electrochemical corrosion and local pitting and perforation of pipelines.\u00a0The hydrogen atoms […]<\/p>","protected":false},"author":1,"featured_media":4006,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"yoast_head":"\n
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- The carbon content of steel should be reduced as much as possible under the condition of satisfying the mechanical properties of steel plate. For Low carbon steel and carbon-manganese steel: CE\u22640.43, CE=C+Mn\/6; For low alloy steel: CE\u2264045 CE=C+Mn\/6+(Cr+Mo+V)\/5+(Ni+Cu)\/15<\/li><\/ul>\n\n\n\n
- Hardness is not more than 22HRC, yield strength is less than 355MP, tensile strength is less than 630MPa<\/li><\/ul>\n\n\n\n
- Impurities in steel: sulfur \u2264 0.002%, P\u22640.008%, O\u2264 0.002%.<\/li><\/ul>\n\n\n\n