20g

Data under review

20g is the classic Chinese plain-carbon boiler plate of GB/T 713, long used for low and medium-pressure boiler drums and shells. Modern specifications increasingly replace it with Q245R, its direct successor designation in the current vessel-plate system.

AISIA516 Gr.60 (near)

GB20g (GB/T 713, legacy)

CategoryStructural & HSLA Steel

Chemical composition

Element	Content (%)
C	0.17–0.23
Si	0.15–0.40
Mn	0.50–0.90
P	≤0.025
S	≤0.015

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Yield strength	≥245 MPa
Tensile strength	400–520 MPa
Density	7.85 g/cm³

Heat treatment

Supplied normalized.

Equivalent grades

Standard	Designation
aisi	A516 Gr.60 (near)
gb	20g (GB/T 713, legacy)

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: Low-pressure boilers, drums, hot-water vessels, general hot plate work.

Processing: Very weldable plain carbon steel; vessel fabrication quality (impact/UT) is ordered to GB/T 713.

Need 20g from stock?

Steel.Wiki is sponsored by Shenzhen NewAsia Special Steel (Nasteel), a special-steel stockholder in Shenzhen stocking mold, tool and alloy steels with EN 10204 3.1 certification.

Ask for a quotation Visit Nasteel

Source: GB/T 713 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.