GB/T 9948 petrochemical tube

At a glance

GB/T 9948 covers seamless steel tubes for petroleum cracking and, since the 2025 edition in force from 1 January 2026, for petrochemical and chemical plants in general. It includes carbon grades 10 and 20 and chromium-molybdenum grades such as 12CrMo and 15CrMo, for furnace tubes, heat exchangers and process piping.

Standards

GB/T 9948

Grades

10, 20, 12CrMo, 15CrMo

Manufacture

Hot-finished or cold-drawn

Dimensions

GB/T 17395

Lengths

6 m or 12 m fixed lengths, or single/double random (SRL/DRL)

Ends

Plain end (PE) · Bevelled end (BE)

Surface

Black varnish or bare, as the mill supplies; ask us about other coatings

HS code

7304.39, 7304.51, 7304.59 Indicative. Your customs broker confirms the national tariff line.

Availability

Supplied to order

Grades and mechanical properties

10 · 20 · 12CrMo · 15CrMo — Grades to the standard; tell us the grade in your specification.

Sizes

Sized by outside diameter × wall thickness (GB/T 17395). Send us the sizes you need.

Full pipe schedule chart

Testing

• Chemical analysis
• Tensile test
• Charpy impact test (where the grade requires it)
• Flattening test
• Flaring test
• Hydrostatic test
• Non-destructive testing (UT / eddy current)
• Visual and dimensional inspection

Documents

Mill test certificate to EN 10204 3.1, naming the producing mill and the country of origin. Third-party inspection by an agency you nominate, or EN 10204 3.2, on request.

Applications

• Refinery furnace tubes
• Heat exchangers and condensers in petrochemical plants
• Process piping in chemical plants
• Cr-Mo alloy service at elevated temperature