China Q355 Hot Rolled Seamless Steel Pipe Manufacturer and Supplier

Q355 Hot Rolled Seamless Steel Pipe

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Chemical Composition(%)

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	0.3	0.3	0.4	0.012
	Q355C	0.2			0.03	0.03				0.012
	Q355D	0.2			0.025	0.025				–

Mechanical Properties

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

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

Impact Test

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)

Q355 Steel Equivalent Grade

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)

Straightening

Post annealing, the goods are passed through a seven roller straightening machine to achieve proper straightening of the tubes.

Eddy current

Post straightening, each tube is passed through eddy current machine to detect for surface cracks and other defects . Only the tubes that pass eddy current are fit for delivery to customers.

Finishing

Each tube is either oiled with corrosion resistant oil or varnished for surface protection and corrosion resistant as per customers requirement, each tube end is covered by plastic end caps to avoid damage in transit, the marking and specs are put and the goods are ready for dispatch.

Application

Q355 Hot Rolled Carbon steel seamless pipes are extensively applied in the nuclear device, gas conveyance, petrochemical, shipbuilding and boiler industries, with characteristics of high corrosion resistance combined with suitable mechanical properties.

- Nuclear device
- Gas conveyance
- Petrochemical industries
- Shipbuilding and boiler industries