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Q355 Steel Properties, Composition & Equivalent

Views: 11167 Author: Site Editor Publish Time: 2021-07-23 Origin: Site

Q355 Steel (Q355B Q355C Q355D)

Q355 steel is a Chinese low alloy high strength structural steel, which replaced Q345, the material density is 7.85 g/cm3. According to GB/T 1591 -2018, Q355 has 3 quality levels: Q355B, Q355C and Q355D. “Q” is the first letter of Chinese Pinyin: “qu fu dian”, which means Yield Strength, “355” is the minimum value of yield strength 355 MPa for steel thickness ≤16mm, and tensile strength is 470-630 Mpa.

Datasheet and Specification

The tables below shows the Q355 material datasheet and specifications such as chemical composition, and mechanical properties.

Q355 Steel Chemical Composition (Hot rolled)

Steel Grade	Quality Grade	C % (≤)	Si % (≤)	Mn (≤)	P (≤)	S (≤)	Cr (≤)	Ni (≤)	Cu (≤)	N (≤)
Q355	Q355B	0.24	0.55	1.6	0.035	0.035	0.30	0.30	0.40	0.012
	Q355C	0.20			0.030	0.030				0.012
	Q355D	0.20			0.025	0.025				–

Carbon Equivalent (CEV)

Based on smelting analysis, steel delivered in hot rolled state.

		CEV (Mass fraction ≤%); Nominal thickness or diameter (d)
Steel Grade	Quality Grade	≤ 30	30 < d ≤ 63	63 < d ≤ 150	150 < d ≤ 250	250 < d ≤ 400
Q355	Q355B	0.45 (CEV)	0.47	0.47	0.49	–
	Q355C					–
	Q355D					0.49

Q355 Mechanical Properties (Hot rolled)

Notes:

1 MPa = 1 N/mm2
1 GPa = 1 kN/mm2

		Yield Strength (≥N/mm2), Thickness or Dia. (d) in mm
Steel Grade	Quality Level	d≤16	16< d ≤40	40 < d ≤63	63 < d ≤ 80	80< d ≤ 100	100< d≤ 150	150 < d≤ 200	200 < d ≤ 250	250 < d ≤ 400
Q355	Q355B	355	345	335	325	315	295	285	275	–
	Q355C									–
	Q355D									265

		Tensile Strength (N/mm2), Dia. (d) mm
Steel Grade	Quality Level	d≤100	100 < d ≤ 150	150 < d ≤ 250	250 < d ≤ 400
Q355	Q355B	470 – 630	450 – 600	450 – 600	–
	Q355C				–
	Q355D				450 – 600

Q355 Steel Elongation

	Dia. (d) mm; Elongation (%)
Sample direction	d≤40	40 < d ≤ 63	63 < d ≤ 100	100 < d ≤ 150	150 < d≤ 200	250 < d ≤ 400
Horizontal	20	19	18	18	17	17
Vertical	22	21	20	18	17	17

Charpy Impact

Charpy (V-notch) impact test temperature and impact absorption energy (KV2/J).

Quality	Temperature	Longitudinal Impact Energy (J), ≥	Transverse Impact Energy (J), ≥
Q355B	20 ℃	34	27
Q355C	0 ℃	34	27
Q355D	-20 ℃	34 (for thickness ≥250mm)	27 (for thickness ≥250mm)

Features and Applications

Q355 steel has good mechanical properties, good weldability, hot and cold processing properties and corrosion resistance. Can be used to manufacture ships, boilers, pressure vessels, petroleum storage tanks, bridges, power station equipment, lifting transport machinery and other higher load welded structural parts.

Q355 Steel Equivalent Grade

Q355 carbon steel equivalent to European EN (German DIN EN, British BSI, French NF…) and ISO standard.

China		ISO		European Union
Standard	Grade	Standard	Grade	Standard	Grade (Material Number)
GB/T 1591 -2018	Q355B	ISO 630-2	S355B	EN 10025-2	S355, S355JR (1.0045)
	Q355C		S355C		S355J0 (1.0553)
	Q355D		S355D		S355J2 (1.0577)

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