What is the difference between SA516Gr60(R-HIC) and SA516Gr60(HIC)?

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1. Scope of application: These technical specifications apply to the inspection and acceptance of steel plates with a thickness of ≤165 mm, made of SA516Gr60 (HIC), SA516Gr60 (R-HIC), SA516Gr65 (HIC), SA516Gr65 (R-HIC), and SA516Gr70 (HIC), SA516Gr70 (R-HIC), when used in acidic environments. Steel grades resistant to hydrogen sulfide corrosion, which also include tests for sulfide stress corrosion cracking (SSCC), are denoted as SA516Gr60 (R-HIC), SA516Gr65 (R-HIC), and SA516Gr70 (R-HIC). To meet the various requirements of users and facilitate production management, the S and P requirements for different steel grades are further divided into three levels: I, II, and III. 2. Grade description: SA516Gr60(HIC)-Ⅰ refers to the steel grade SA516Gr60; the corrosion test consists only of hydrogen-induced cracking testing (HIC). The compositional requirements are P≤0.015 and S≤0.003 as determined by melting analysis ； Finished product analysis: P≤0.015, S≤0.004. SA516Gr60(R-HIC)-Ⅰ refers to the steel grade SA516Gr60; the corrosion tests include hydrogen-induced cracking (HIC) testing and sulfide stress corrosion cracking (SSCC) testing. The compositional requirements are P≤0.015 and S≤0.003 as determined by melting analysis ； Finished product analysis: P≤0.015, S≤0.004. 3. Dimensions, shape, weight, and allowable tolerances: The dimensions, shape, weight, and allowable tolerances of the steel plates shall comply with the specifications in ASMESA20/SA20M. The surface quality of 12MnNiVR, 12Cr2Mo1R, 14Cr1MoR (H), SA387Gr11CL2, and SA387Gr22CL2 steel plates shall comply with the specifications in ASMESA20/SA20M. The steel plate markings and quality certificates shall comply with the provisions of ASMESA20/SA20M. Additional requirements (guaranteed only if requested by the user and specified in the contract): 1. Simulated post-weld heat treatment regime. 2. High-temperature tensile testing (to be agreed upon by both parties). 3. Low-temperature impact testing (to be agreed upon by both parties). 4. Inspection rules for steel plate resistance to hydrogen-induced cracking (HIC). A. Methods for hydrogen-induced cracking (HIC) testing; either method may be selected: (1) Follow the NACE TM0284 standard, using Solution A; the average value of the three specimens shall be: CLR≤10% ； CSR≤3% ； CTR≤1%. (2) In accordance with the NACETM0284 standard, using Solution B, the average value for the three samples is: CLR≤10% ； CSR≤3% ； CTR≤1.5%. (3) In accordance with GB8650 standard, using Solution A, the average value for the three samples is: CLR≤10% ； CSR≤3% ； CTR≤1.5%. (4) In accordance with GB8650 standard, using Solution B, the average value for the three samples is: CLR≤10% ； CSR≤3% ； CTR≤1.5%. Among them, PH: medium acidity and alkalinity ； CLR: Percentage of crack length ； CSR: Crack sensitivity percentage ； CTR: Percentage of crack thickness. B. Acceptance criteria for HIC testing: HIC testing should be conducted on batches, with each batch consisting of steel plates from the same furnace batch, with the same thickness and under the same heat treatment conditions. When the thickness is not greater than 30 mm, one set of specimens is taken, with the specimen dimensions being plate thickness * 20 mm * 100 mm ； When the thickness is greater than 30 mm, a set of specimens is taken from the midpoint of the thickness, with specimen dimensions of 20 mm * 20 mm * 100 mm. Inspection rules for sulfide stress corrosion resistance testing of 12MnNiVR, 12Cr2Mo1R, 14Cr1MoR (H), SA387Gr11CL2, and SA387Gr22CL2 steel plates: A. Test methods for sulfide stress corrosion (SSCC); either of the following test methods may be used: (1) Comply with the GB4157 standard. (2) Compliance with standard NACETM0284 B – SSCC test acceptance criteria: The threshold stress is 80% of the nominal yield strength. The SSCC tests shall be conducted on a batch basis; a batch may be formed from steel plates of various thicknesses under the same contract number, with samples taken at 1/2 of the thickness. SA516Gr60 (R-HIC), SA516Gr65 (HIC), SA516Gr65 (R-HIC) and SA516Gr70 (HIC), SA516Gr70 (R-HIC)