Technical Standards

The library distinguishes product standards (what the steel is), design standards (how members are designed) and fabrication standards (how steelwork is made and erected).

Product standards

CN GB/T 11263:2017 Product

Hot-rolled H and cut T section steel

Dimensions, masses and sectional properties of HW, HM, HN and HT sections.

Applies to: HW HM HN

SAC (Standardization Administration of China) · Unverified confirm current edition and amendments

CN GB/T 706:2016 Product

Hot rolled section steel (I-beams, channels, angles)

Dimensions and masses of hot-rolled I-beams, channels and equal/unequal angles.

Applies to: L

SAC (Standardization Administration of China) · Unverified confirm current edition and amendments

CN GB/T 6728:2017 Product

Cold formed steel hollow sections for general structure – Dimensions, shapes, weight and permissible deviations

Cold-formed square and rectangular hollow sections.

Applies to: SHS RHS

SAC (Standardization Administration of China) · Unverified confirm current edition and amendments

CN GB/T 8162:2018 Product

Seamless steel tubes for structural purposes

Hot-rolled and cold-drawn seamless tubes for structures.

Applies to: CHS

SAC (Standardization Administration of China) · Unverified confirm current edition and amendments

CN GB/T 700:2006 Product

Carbon structural steels (Q195, Q215, Q235, Q275)

Carbon structural steel grades including Q235B.

Applies to: HW HM HN L SHS RHS PL

SAC (Standardization Administration of China) · Unverified confirm current edition and amendments

CN GB/T 1591:2018 Product

High strength low alloy structural steels (Q355, Q390, Q420, Q460)

Low-alloy high-strength grades; Q355 replaced Q345 in the 2018 edition.

Applies to: HW HM HN L SHS RHS CHS PL

SAC (Standardization Administration of China) · Unverified confirm current edition and amendments

CN GB/T 709:2019 Product

Dimension, shape, weight and tolerances for hot-rolled steel plates and strips

Dimensions and tolerances of hot-rolled plates.

Applies to: PL

SAC (Standardization Administration of China) · Unverified confirm current edition and amendments

Design standards

CN GB 50017:2017 Design

Standard for design of steel structures

Design of steel structures for buildings and general structures in China.

Applies to: HW HM HN L CHS RHS SHS PL

MOHURD (Ministry of Housing and Urban-Rural Development) · Unverified confirm current edition and amendments

Fabrication standards

CN GB 50205:2020 Fabrication

Standard for acceptance of construction quality of steel structures

Fabrication, erection and quality acceptance of steel structures.

MOHURD (Ministry of Housing and Urban-Rural Development) · Unverified confirm current edition and amendments

Steel grades

GradeStandardProduct form Thickness range → fy / fu (MPa)Data
CN 20 (seamless tube)GB/T 8162:2018Seamless structural tubes 0–16 mm: 245 / 410 16–40 mm: 235 / 410 U
CN Q235BGB/T 700:2006Sections, bars, tubes and plates 0–16 mm: 235 / 370 16–40 mm: 225 / 370 40–60 mm: 215 / 370 60–100 mm: 215 / 370 U
CN Q355BGB/T 1591:2018Sections, tubes and plates 0–16 mm: 355 / 470 16–40 mm: 345 / 470 40–63 mm: 335 / 470 63–80 mm: 325 / 470 80–100 mm: 315 / 470 U

Grade strengths are entered for reference and marked UNVERIFIED until checked against the current edition. Always use the mill certificate and the current standard for design.