GB/T 18248 30CrMo seamless pipe for gas cylinders

Standard: GB/T 18248

GB/T 18248 30CrMo steel pipe is a seamless alloy steel pipe for gas cylinders. The company has advanced technology and equipment and a strong technical force,and its seamless pipes production and inspection equipment are most up-to-date in domestic steel pipe industry.

GBT 18248 grades: 30CrMo, 35CrMo, 34CrMo4

30CrMo seamless pipes equivalent: 30CrMo4 in EN 10297-1:2003, A372 Grade E

30CrMo seamless pipe has high static strength, impact toughness and high fatigue limit. The harden ability is higher than 40Cr, higher creep strength and lasting strength under high temperature, long-term working temperature up to 500 ℃.

GBT 18248 30CrMo seamless pipe composition(%)

Grade	C	Si	Mn	P,S	P+S	Cu	Ni	Mo	Cr
30CrMo	0.26-0.34	0.17-0.37	0.40-0.70	≤0.020	≤0.030	≤0.20	≤0.30	0.15-0.25	0.80-1.10

GBT 18248 30CrMo steel pipe mechanical properties

Grade	Tensile strength [min, Mpa]	Yield strength [min, Mpa]	Elongation [%,min]
30CrMo	930	785	12

Outside Diameter & Wall Thickness Tolerance

Types	Pipe diameter, mm	Tolerance	Wall thick tolerance
Types	Pipe diameter, mm	Tolerance	Ordinary	High quality
Hot rolled pipe	D＜339.7	±1%	+12.5%, -10%	±10%
Cold drawn pipe	D≥339.7	±1%	+15%, -12.5%	+12.5%, -10%
Cold drawn pipe	All	±0.75%	±10%	±7.5%

30CrMo seamless alloy steel pipe can be utilized to make significant parts in different machines that withstand effect, twisting and high loads, for example, moving factory gears, crankshafts, associating bars, clasp, car motor axles, axles, motor transmission parts, substantial engine shafts, screws for boilers with working temperatures beneath 400 °C

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