GB/T 9711-2023 与 API 5L 对比：改了什么、买家该查什么

GB/T 9711-2023 — What Actually Changed

GB/T 9711-2023 replaced the 2017 edition from March 2024. Key buyer-facing changes: tightened chemistry limits on P and S for PSL2, clearer UT acceptance levels aligned with API 5L, and revised hydrostatic test pressure formulas.

What to Check on the Mill Test Certificate

• Chemical composition vs the grade table (P ≤ 0.025% for PSL2)
• Hydrostatic test pressure and hold time
• NDT method and acceptance level (UT L2/L4)

Our SSAW spiral pipe is supplied fully to GB/T 9711-2023 or API 5L — you specify, we certify.