The H2S near the welds of base metal will result in HIC or embrittlement for the gas pipeline, and with the growth of H2S content in the gas, the trend of HIC will tend to be obvious.

• 在靠近焊缝的母材中H2S容易诱发氢致裂纹和脆化，并且随着天然气中H2S含量增加，氢致裂纹的倾向会加大。