GB/T 20972.2-2025 Chinese PDF (GB /T20972.2-2025)GB T 20972. 2 2025_Chinese: Petroleum and natural gas industries Materials for use in H2S containing environments in oil and gas production Part 2: Cracking resistant carbon and low alloy steels, and the use of cast irons (Chinese: 2) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 20972. 2 2025
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