Are there seamless steel pipes according to GB/T8163 in the Ia outer diameter series (HG/T20553)?

2021-10-29View Original

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Are there seamless steel pipes according to GB/T8163 in the Ia outer diameter series (HG/T20553)?

Reply #22021-10-29

There are Ia series pipes, but the fittings do not match; for example, the outer diameter of a DN65 pipe is 76.1, while the outer diameter of elbows and tees is 73 (GB12459).

Reply #32021-10-29

Thank you for your reply. In other words, GB/T8163 is a quality standard for seamless steel pipes, while HG20553 is a standard regarding their dimensional specifications; the two are not contradictory. Seamless steel pipes that comply with the 8163 standard should include those with an outer diameter in the Ia series as well as those in the II series, right? As for the issue of the mismatch in dimensions between Ia series DN65 pipes and 12459 fittings, it’s about trying not to use this DN65 diameter, right?

Reply #42021-10-29

DN32 and DN125 also do not match.

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