1 Scope The technical requirements applicable to thickness 8mm-130mm Q345R (HIC) in an acidic environment and the use of Q345R (R-HIC) steel, plus do SSCC test items of hydrogen sulfide corrosion resistant steel grades with Q345R (R-HIC ) said. 2 size, shape, weight and allow deviation 2.1 steel plate size, shape, weight and tolerances shall comply with the provisions of GB / T709's. 2.2 thickness deviation by Class B or Class C GB / T709 execution specified in the contract. 2.3 plate by theoretical weight delivery, Thickness Theoretical weight used was the arithmetic mean of the maximum allowable plate thickness and the minimum thickness. The density of steel is 7.85g / cm3. 3 Technical requirements 3.1 chemical composition of the steel chemical composition shall conform to the following requirements. Grade C Si Mn PS *** Ca * O * CE ** melting analysis ≤0.20 0.20-0.55 1.20- 1.36 ≤0.015 ≤0.003 0.0015- 0.0030 ≤0.004 ≤0.45 product analysis 0.20-0.60 ≤0.004 Note: (1) Ca value for reference, not for acceptance conditions, Ca, O content available product analysis value instead of melting analysis values; (2) the carbon equivalent (CE) is calculated as follows: CE = C + Mn / 6 + (Cu + Ni) / 15 + ( Cr + Mo + V) Target / 5 (3) S content is 0.002% (4) In order to improve the quality of the plate, you can add some micro-alloying elements. 3.2 Methods smelting furnace + furnace smelting refining manner, Ca process smelting process, and it should be the essence of fine-grained steel, ≤80mm steel actual grain size 6 or 6 above;> 80mm steel plate actual grain degree is five or five more. 3.3 Delivery status: normalizing. 3.4 Sample Status: All plates respond after a sample for testing simulated weld heat treatment which, after the simulated weld heat treatment temperature: 610-635 ℃, holding time: 4-12 hours, depending simulated post weld heat treatment system specified in the contract. 3.5 Mechanical properties 3.5.1 steel mechanical properties after heat treatment simulation of welding specimens shall conform to the following requirements. Thickness (mm) ReL MPa Rm MPa A% 180 ° bending test b = 2a in the thickness direction performance ψZ (%) average of the individual values ??8--16 ≥345 510-640 ≥21 d = 2a ≥35 ≥25> 16-- 36 ≥325 500-630 d = 3a> 36--60 ≥315 490-620> 60-100 ≥305 490-620 ≥20> 100-130 ≥285 480-610 NOTE: impact requirements can be negotiated 3.5.2 cloth Hardness: by rolling steel sheets should Brinell hardness test, Brinell hardness ≤200HB. 3.6 Ultrasonic Inspection: steel sheets should be by ultrasonic testing and inspection, testing standard levels specified in the contract. 3.7 each batch of steel test items, the number of samples, sampling methods and test methods shall meet the following requirements. Test item number of samples (a) sampling methods Test Methods for Chemical Analysis 1 melting analysis (per oven) GB / T20066 GB / T223 product analysis 1 (by rolling sheets) stretching 1 (by rolling sheets) GB / T2975 GB / T228 Bending 1 (by rolling sheets) GB / T2975 GB / T232 thickness properties 3 (by rolling sheets) GB / T5313 GB / T5313 grain size 1 (per oven) YB / T5148-93 Brinell hardness 1 (by rolling System photos) GB / T231 ultrasonic flaw detection test to see the contract by one additional requirements specified HIC additional requirements specified in the contract * Shock 3 (by rolling sheets) GB / T2975 GB229 * high-temperature tensile 1 (by rolling sheets) see GB / T2975 specified in the contract GB / T4338 * SSCC tests specified in the contract Note: * to select an item. 4. 4.1 steel surface quality inspection rules should be consistent with the provisions of GB713-2008. 4.2 steel packaging, marking and quality certificate shall comply with the provisions of GB713-2008. 4.3 outstanding issues in the implementation of the provisions of the additional requirements GB713-2008 (only to be guaranteed in the contract noted in the user request and) after simulated welding heat treatment system steel resistance to hydrogen induced cracking (HIC) test inspection rules A. Resistance to hydrogen induced cracking (HIC) test methods, test methods, optionally one (1) Implementation of NACE TM0284 standard, the use of A solution, with an average of three samples: CLR≤10%; CSR≤3%; CTR≤1 %. (2) the implementation of NACE TM0284 standard, the use of B solution, with an average of three samples: CLR≤10%; CSR≤3%; CTR≤1.5%. (3) implementation of GB8650 standards, an average of three samples: CLR≤5%; CSR≤0.5%; CTR≤1.5%; wherein PH: medium pH; CLR: crack length percentage; CSR: Percentage crack sensitive; CTR: thickness crack percentage B. HIC HIC test acceptance criteria should be batch acceptance test, each batch from the same heat, the same thickness of steel, the same heat treatment system components. When the thickness is not more than 30mm, to take a group of specimens, specimen size of thickness * 20mm * 100mm; thickness greater than 30mm, a set of samples taken from a thickness of 1/2 of the sample size is 20mm * 20mm * 100mm. 5. Plate sulfide stress corrosion test inspection rules sulfide stress corrosion test (SSCC) standard test method for the implementation of GB4157-84, threshold stress Reh≥230Mpa.