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51317--9645-Sulfide Stress Cracking (SSC) Resistance of AISI 420 Modified (13Cr) Martensitic Stainless Steel Bar

This paper discusses a study wherein the SSC resistance of 13Cr bar stock quenched and tempered to 22 HRC maximum hardness was tested and evaluated beyond the maximum H2S limit of 10 kPa (1.5 psi) established in NACE MR0175/ISO 15156-3 for use in sour service.

 

Product Number: 51317--9645-SG
ISBN: 9645 2017 CP
Author: Karthik Krishnan
Publication Date: 2017
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Sulfide Stress Cracking (SSC) Resistance of AISI 420 Modified (13Cr) Martensitic Stainless Steel Bar StockKarthik Krishnan* HalliburtonAISI 420 modified (13Cr) martensitic stainless steels are widely used in the manufacture of downhole completion equipment for oil and gas production environment. 13Cr is primarily used in CO2 rich production environments in which carbon/low alloy steels are subject to high corrosion rates. The material is available as both bar stock and tubing. Bar stock is predominantly used for manufacturing thick walled completion tool components. 13Cr material that has been quenched and tempered to 22 HRC maximum hardness provides resistance to sulfide stress cracking (SSC) in environments with low hydrogen sulfide (H2S); it is typically used to a maximum H2S limit of 10 kPa (1.5 psi) in accordance with the NACE MR0175/ISO 15156-3 guidelines. For H2S levels that exceed 10 kPa (1.5 psi) the primary option for completion tools is the use of precipitation hardenable nickel alloys such as Alloy 925 and Alloy 718 which can also be obtained as bar stock but are significantly more expensive than 13Cr.In this study the SSC resistance of 13Cr bar stock that was quenched and tempered to 22 HRC maximum hardness was evaluated by testing beyond the maximum H2S limit of 10 kPa (1.5 psi) established in NACE MR0175/ISO 15156-3 for use in sour service. The SSC testing simulated various H2S levels and was performed on various heats bar stock material sizes and different hot work ratios. The SSC results showed that 13Cr material quenched and tempered to 22 HRC maximum hardness has cracking resistance at H2S levels up to 100 kPa (14.5 psi) depending on pH and salinity conditions. This performance indicates that this material can be used for downhole equipment in certain oil and gas production well conditions in which the alternative options would be to use the far more expensive nickel alloys.Keywords: Sulfide Stress Cracking (SSC) AISI 420 modified (13Cr) stainless steel bar stock H2S NACE MR0175/ISO 15156

Keywords: Sulfide Stress Cracking (SSC), AISI 420 modified (13Cr), stainless steel, bar stock, H2S, NACE MR0175/ISO 15156

Sulfide Stress Cracking (SSC) Resistance of AISI 420 Modified (13Cr) Martensitic Stainless Steel Bar StockKarthik Krishnan* HalliburtonAISI 420 modified (13Cr) martensitic stainless steels are widely used in the manufacture of downhole completion equipment for oil and gas production environment. 13Cr is primarily used in CO2 rich production environments in which carbon/low alloy steels are subject to high corrosion rates. The material is available as both bar stock and tubing. Bar stock is predominantly used for manufacturing thick walled completion tool components. 13Cr material that has been quenched and tempered to 22 HRC maximum hardness provides resistance to sulfide stress cracking (SSC) in environments with low hydrogen sulfide (H2S); it is typically used to a maximum H2S limit of 10 kPa (1.5 psi) in accordance with the NACE MR0175/ISO 15156-3 guidelines. For H2S levels that exceed 10 kPa (1.5 psi) the primary option for completion tools is the use of precipitation hardenable nickel alloys such as Alloy 925 and Alloy 718 which can also be obtained as bar stock but are significantly more expensive than 13Cr.In this study the SSC resistance of 13Cr bar stock that was quenched and tempered to 22 HRC maximum hardness was evaluated by testing beyond the maximum H2S limit of 10 kPa (1.5 psi) established in NACE MR0175/ISO 15156-3 for use in sour service. The SSC testing simulated various H2S levels and was performed on various heats bar stock material sizes and different hot work ratios. The SSC results showed that 13Cr material quenched and tempered to 22 HRC maximum hardness has cracking resistance at H2S levels up to 100 kPa (14.5 psi) depending on pH and salinity conditions. This performance indicates that this material can be used for downhole equipment in certain oil and gas production well conditions in which the alternative options would be to use the far more expensive nickel alloys.Keywords: Sulfide Stress Cracking (SSC) AISI 420 modified (13Cr) stainless steel bar stock H2S NACE MR0175/ISO 15156

Keywords: Sulfide Stress Cracking (SSC), AISI 420 modified (13Cr), stainless steel, bar stock, H2S, NACE MR0175/ISO 15156

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