Proprietary Sour Service Steel Grades

United States Steel proprietary steel grades for sour service environments meet or exceed API specifications.

U. S. Steel Tubular Products produces a wide offering of proprietary steel grades ideal for sour service environments.

U.S. Steel Tubular Products Proprietary Sour Service Steel Grades:

  • USS GT80S is a proprietary controlled yield strength U. S. Steel grade generally for use in severe sour service wells. Inspection, testing and dimensions are in accordance with API L80. NACE (SSC), Method A, qualification testing is specified at a threshold stress of 90% of specified minimum yield strength. API C90 couplings are used on threaded and coupled products.
  • USS C90 is a proprietary, restricted yield strength U. S. Steel grade for use in sour condensate wells. Resistance to sulfide stress cracking is achieved by precise controls of chemical composition, heat treatment, and hardness levels. Inspection requirements and dimensional tolerances are in accordance with API 5CT for grade C90. Performance properties are the same as for API grade C90. Hardness testing is conducted as required for API C90, with the exception of frequency (casing and non-upset tubing – first and last and every tenth joint in between; upset tubing – first and last and every 25th joint in between). To reduce order lead time, sulfide stress corrosion cracking (SSCC) testing is not required for every order. If required by the customer, SSCC testing can be performed to U. S. Steel Standard Mill Practice P-1004 (NACE Standard TM-0177, Method A) with a guaranteed minimum threshold stress of 85% of specified minimum yield strength.
  • USS SC90 is a proprietary, restricted yield strength U. S. Steel grade for use in sour condensate wells. This product is the same as USS C90 except impact testing is required and hardness testing is done on each end of each joint for casing and non-upset tubing.
  • USS C95 is a proprietary restricted yield strength U. S. Steel grade for use in sour condensate wells. Resistance to sulfide stress cracking is achieved by precise controls of chemical composition, heat treatment and hardness levels. Inspection requirements and dimensional tolerances are in accordance with API 5CT for grade T95. Performance properties are the same as for API grade T95. Hardness testing is conducted as required for API T95, with the exception of frequency (casing and non-upset tubing first and last and every tenth joint in between) upset tubing (first and last and every 25th joint between). To reduce order lead-time, sulfide stress corrosion cracking (SSCC) testing is not required for every order. If required by the customer, SSCC testing can be performed to U. S. Steel Standard Mill Practice P-1004 (NACE Standard TM-0177, Method A) with a guaranteed minimum threshold stress of 85% of specified minimum yield strength.
  • USS C100 is a proprietary controlled yield strength U. S. Steel grade generally for use in deep sour service wells. Inspection, testing, and dimensions are in accordance with API 5CT C90 and T95. NACE (SSC), Method A, testing is specified at a threshold stress of 85% of specified minimum yield strength.
  • USS RYS110 is a proprietary restricted yield strength U. S. Steel grade for use in sour condensate wells. Resistance to sulfide stress cracking is achieved by precise controls of chemical composition, heat treatment, and hardness levels. Inspection requirements and dimensional tolerances are in accordance with API 5CT for grade P110 PSL 1. Performance properties are the same as for API grade C110. One quadrant through-wall hardness testing is performed at a frequency of two per 100 pieces per heat lot. To reduce order lead-time, sulfide stress corrosion cracking (SSCC) testing is not required for every order. If required by the customer, SSCC testing can be performed to U. S. Steel Standard Mill Practice M-1041 with a guaranteed minimum threshold stress of 80% specified minimum yield strength in 3-1/2% H2S NACE A solution (Method A) or 24 klssc-sqrtinch in full H2S NACE A solution (Method D).
  • USS RYH110 is an ERW proprietary restricted yield strength grade for general use in deep wells. This product is not generally considered suitable for sour condensate wells. Restricted yield strength and hardness are achieved by precise controls of chemical composition, heat treatment and hardness levels. Inspection requirements and dimensional tolerances are in accordance with API 5CT for grade P110 PSL 1. One quadrant through-wall hardness testing is performed at a frequency of two per 100 pieces per heat lot. Couplings are seamless USS RYS110 grade. The product’s performance properties are the same as for grade USS RYS110 (see Casing Tables).
  • USS C110 is a proprietary controlled yield strength U. S. Steel grade generally for use in deeper sour condensate wells. Inspection, testing and dimensions are in accordance with API T95. sulfide stress corrosion cracking (SSCC) testing is required for each heat to meet a threshold stress of 85% of specified minimum yield strength.
 
Product Minimum Yield Strength Maximum Yield Strength Minimum Tensile Strength Maximum Hardness
USS GT80S 80,000 psi 95,000 psi 95,000 psi 23.0 HRC
USS C90 90,000 psi 105,000 psi 100,000 psi 24.0 HRC mean
USS SC90 90,000 psi 105,000 psi 100,000 psi 24.0 HRC mean
USS C95 95,000 psi 110,000 psi 105,000 psi 25.0 HRC mean
USS C100 100,000 psi 115,000 psi 110,000 psi 28.0 HRC mean
RYS110 110,000 psi 125,000 psi 120,000 psi 29.0 HRC mean
RYH110 110,000 psi 125,000 psi 120,000 psi 31.0 HRC mean
USS C110 110,000 psi 125,000 psi 120,000 psi 30.0 HRC mean