ZC Steel Pipe — OCTG & Line Pipe for Oil & Gas

What We Supply

OCTG — Casing & Tubing

API 5CT casing and tubing in grades N80, R95, L80, C90, T95, P110, C110, Q125. Premium connections available.

Premium Connections

Metal-to-metal seal premium connections — ZC-1 through ZC-6 series. Gas-tight, API 5C5 CAL IV qualified. Independent patents.

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Seamless Line Pipe

API 5L seamless line pipe in grades X52 through X80, PSL1 and PSL2. Sour service HIC qualification available.

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Welded Line Pipe

ERW, LSAW and SSAW welded line pipe in API 5L grades X52–X80 for onshore and offshore pipeline projects.

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Why ZC Steel Pipe

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API & ISO Certified

API 5CT, API 5L, ISO 11960 and ISO 3183 certified manufacturing. EN 10204 3.2 MTC on all orders.

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Patented Premium Connections

Independent patents on ZC-1 through ZC-6 premium connection series. API 5C5 CAL IV gas-tight qualification.

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Global Export Experience

Completed projects across Africa, the Middle East, South America and Southeast Asia. Third-party inspection available.

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Order-to-Make Flexibility

Non-standard grades, wall thicknesses and lengths available. Sour service, HPHT and CRA grades on request.

Technical Resources

OCTG

How to Choose an API Oil Casing Pipe Manufacturer: A Procurement Guide

A guide to evaluating Chinese API 5CT casing mills — what to verify on the RFQ, what documents to request, and the red flags that precede a bad shipment.

Read article → 13Cr / CRA

L80 Type 1 vs L80-13Cr vs L80-9Cr: OCTG Grade Selection for Corrosive Wells

L80 Type 1 is the sour-service grade. L80-13Cr and 9Cr resist CO2 — but fail in H2S. API 5CT 11th edition selection guide for corrosive wells.

Read article → Line Pipe

LSAW vs SSAW Pipe: Differences, Applications, and When to Specify Each

LSAW vs SSAW pipe: manufacturing, OD range, dimensional tolerance, weld geometry, and when each is specified for API 5L pipelines. Includes PO guidance.

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