Large-caliber national standard spiral steel pipe mainly based on standards for GB/T9711-1997 oil and gas industry conveying steel pipe, including GB/T9711.1 (representing A grade steel) and GB/T9711.2 (representing B grade steel), GB9711.2 includes quality and test requirements in general higher than GB9711.1 regulations, GB9711.2 generally applies to flammable fluid conveying steel pipes, not applicable to cast tubes.

GB/T9711 Part 1 ee käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi de käke luɔɔi

Standard kënë anɔŋgɔ tɔ̈u tɔ̈u tɔ̈u tɔ̈u tɔ̈u tɔ̈u tɔ̈u tɔ̈u tɔ̈u tɔ̈u tɔ̈u tɔ̈u No threaded, super light weight grade no threaded, ordinary heavy weight grade no threaded, special heavy weight grade (XS) no threaded and special heavy weight grade (XXS) no threaded steel tubes; no threaded, super light weight grade no threaded, ordinary heavy weight grade no threaded, special heavy weight grade (XS) no threaded and special heavy weight grade (XXS) no threaded steel tubes; no threaded, special heavy weight grade no threaded, ordinar Ku jɔl ya tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë A sɔrɔ ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ, ka tɛmɛ

L175, L210, L245, L290, L320, L360, L390, L415, L450, L485, L555, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290, L290 Tabel 9A, Tabel 9B ye tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ̈n yenë tɛ Kɛ̈ɛ̈r dɛ̈t peei, a dɛ̈t ye cɔl a dɛ̈t ye cɔl a dɛ̈t ye cɔl a dɛ̈t ye cɔl a dɛ̈t.

Në wɛ̈t bɛ̈ɛ̈i de wɛ̈t bɛ̈ɛ̈i de wɛ̈t bɛ̈ɛ̈i de wɛ̈t bɛ̈ɛ̈i de wɛ̈t bɛ̈ɛ̈i de wɛ̈t bɛ̈ɛ̈i de Kä ye kek tɛ̈n ye kek tɛ̈n ye kek tɛ̈n ye kek tɛ̈n ye kek tɛ̈n ye kek tɛ̈n ye kek tɛ̈n ye.

Main Material of Large Caliber National Standard Spiral Steel Pipe

Q235A、Q23b、Q345、 L245、L290、X42、 X46、X70、 X80。