Q310GNH - YB /T 4112-2013

Grade	Q310GNH
Corresponding Standard	YB /T 4112-2013 Welded steel tubes with atmospheric corrosion resistance for structural purposes
Classification	Alloy Steel

Q310GNH Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	-	0.25	0.2	0.07	-	0.3	-	0.25
Maximum Value	0.12	0.75	0.5	0.12	0.02	1.25	0.65	0.5

① To improve the properties of steel, one or more microalloying elements can be added: Nb (0.015% to 0.060%), V (0.02% to 0.12%), Ti (0.02% to 0.10%), and Alt ≥ 0.020%. When these elements are used together, at least one of them should meet the lower limit of the chemical composition specified.
② Alloying elements such as Mo (≤ 0.30%) and Zr (≤ 0.15%) can be added.

Q310GNH Mechanical Properties

Thickness t mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Reduction of Area ψ %
t≤16	450~590	≥310	≥20

• B,C-quality class
• According to the requirements of the demander, other test temperatures can be used after negotiation between the supply and demand parties and indicated in the contract.

Approximate Comparison Table Atmospheric Corrosion Resisting Structural Steel

China	Japan	United States
GB	JIS	ASTM
Q310GNH GB/T 4171-2008	SPA-C JIS G3125-2004	Type4 A606-04

Q310GNH Corresponding Standards(Same grade name, different standards)

1	GB /T 4171-2008
	Q310GNH
2	YB /T 4112-2013
	Q310GNH

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