(1) according to provisions of SY/T6194-96. Have the same grade of steel casing and the collar. Sulfur phosphorus content < 0.045%, < 0.045%.

(2) according to the provisions of GB/T222-84 sample for chemical analysis. As stipulated in the relevant part of the GB223 for chemical analysis.

(3) the American petroleum institute ARISPEC5CT1988 version 1. Chemical analysis by ASTME59 the latest version of the sample preparation, press ASTME350 latest version for chemical analysis.

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(1) according to provisions of SY/T6194-96. For flattening test (GB246-97) tension test (GB228-87) and the hydraulic pressure test.

(2) according to the American petroleum institute APISPEC5CT1988 in version 1 rule for hydrostatic pressure test, flattening test, sulfide stress corrosion cracking test, hardness test (ASTME18 or E10 the latest version of the rules), tensile test, transverse impact test (ASTMA370, ASTME23 and the latest version of the provisions of related standards), determination of grain size (ASTME112 latest version or other method).