Which standards does TUOJING supply to?
API 5CT and API 5L for OCTG and line pipe; ASTM and ASME (A106, A333, A335, A234, A182, A105, A350, A312, B16.5, B16.9) for pipe, fittings and flanges; plus GB and MSS standards. Each catalog item lists its governing standard.
Do you ship to the UAE, Saudi Arabia and Iran?
Yes. We consolidate and route to the major Gulf ports — Jebel Ali (UAE), Dammam (KSA) — and Bandar Abbas (Iran), with customs paperwork and last-mile delivery coordinated.
What documentation comes with a shipment?
Mill test certificates to EN 10204 3.1, dimensional and NDT reports, PMI on request, and third-party inspection (SGS / BV / TÜV) coordinated on your behalf.
What is the difference between API 5CT J55 and K55 casing?
Both are Group 1 grades with the same minimum yield (55 ksi). K55 has a higher minimum tensile strength than J55, which affects connection performance — relevant for deeper or higher-load strings.
Can you supply sour-service (H2S) material?
Yes. Grades such as L80 and C90/T95 are produced for sour service with hardness control to NACE MR0175 / ISO 15156. Specify the service and we match the grade.
How fast is a quotation?
We target a 48-hour quotation turnaround on a clear specification — standard, grade, size and quantity.
Do you supply mill quantities or smaller lots?
Both. Material is made to order against your specification; we consolidate mixed lines into a single documented shipment.