Carbon structural steel

Carbon structural steel grade, chemical composition, mechanical properties and main purpose carbon structural steel grades and chemical composition

Brand	grade	Chemical composition (mass fraction) (%)	Deoxygenation method
C	Mn	SP	S	P
≤
Q195		0.06～O.12	O.25～0.50	O.30	O.050	0.045	F, b, Z
Q215	A	O.09~0.15	0.25~0.55	0.30	O.050	O.045	F, b, Z
B	O.045
Q235	A	O.14～O.22	O.30.O.651	0.30	O.050	O.045	F, b, Z
B	0.12～O.20	O.30～0.701	0.045
C	≤0.18	O.35~0.80	0.040	0.040	Z
D	≤0.17	0.035	0.035	TZ
Q255	A	O.18～O.28	O.40～0.70	O.30	O.050	O.045	Z
B	O.045
Q275		0.28～O.38	O.50～O.80	O.35	0.050	0.045	Z

Note: F stands for boiling steel, b stands for semi-killed steel, z stands for killed steel, and TZ stands for special killed steel.

The upper limit of Mn content of 1Q235A and B grade boiling steel is WMn=0.60%.

2 The Si content of the boiling steel Wsi is not more than 0.07%, the Si content of the semi-killed steel Wsi is not more than 0.17%, and the SiSi content of the killed steel is 0.12%.

Yield point of carbon structural steel

Brand	grade	Yield point ós/MPa
Steel thickness or diameter / mm
≤16	>16～40	>40～60	>60～100	>100～150	>150
		≥
Q195		195	185
Q215	A, B	215	205	195	185	175	165
Q235	A, B C, D	235	225	215	205	195	185
Q255	A, B	255	245	235	225	215	205
Q275		275	265	255	245	235	225

Note: The yield point of Q195 is for reference only and is not a delivery condition.

Tensile strength, elongation and impact properties of carbon structural steel

Brand	tensile strength Ób/MPa	Elongation δ5 (%)	Impact test
Steel thickness or diameter / mm	temperature /°C	V-type shock absorption work (vertical) Ak/J
≤16	>16 ~40	>40 ~60	>60 ~100	>100 ~150	>150
≥
Q195	315-430	33	32
Q215	335-450	3l	30	29	28	27	26	20	≥27
Q235	375-500	26	25	twenty four	twenty three	twenty two	twenty one	20	≥27
0
-20
Q255	4lO～550	twenty four	twenty three	twenty two	2l	20	19	20	≥27
Q2 75	490～630	20	19	18	17	16	15

Cold bending properties of carbon structural steel

Brand	Sample orientation	180° cold bending test B=2a/mm
60	>60～100	>100～200
Bending diameter d
Q195	vertical	0
horizontal	0.5a
Q215	vertical	0.5a	1.5a	2a
horizontal	a	2a	2.5a
Q235	vertical	a	2a	2.5a
horizontal	1.5a	2.5a	3a
Q255		2a	3a	3.5a
Q275		3a	4a	4.5a

Note: 8 is the width of the sample, and a is the thickness or diameter of the steel.

Characteristics and applications of carbon structural steel

Brand	Main characteristics	Application examples
Q195	High plasticity, toughness and weldability, good pressure processing properties, but low strength.	Used in the manufacture of anchor Bolts, ploughshares, chimneys, roof slabs, rivets, low carbon steel wires, thin plates, welded pipes, tie rods, hooks, brackets, welded structures
Q215
Q235	Good plasticity, toughness and weldability, cold stamping performance, and a certain strength, good cold bending performance	Widely used in general requirements for parts and welded structures. Such as less stressed rods, connecting rods, Pins, shafts, Screws, nuts, ferrules, brackets, frames, building structures, bridges, etc.
Q255	Good strength, ductility and toughness, good weldability and cold and hot press processing properties	Used to manufacture parts that require less strength, such as bolts, keys, rockers, shafts, tie rods, and various steels, steel plates, etc. for steel structures.
Q275	It has high strength, good plasticity and cutting performance, and certain welding performance. Small parts can be hardened and strengthened	For the manufacture of parts requiring high strength, such as gears, shafts, sprockets, keys, bolts, nuts, steel for agricultural machinery, conveyor chains and chain links

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