This standard applies to -45 ° C ~ -100 ° C grade low temperature pressure vessel pipelines and seamless steel tubes for low temperature heat exchanger pipelines

GB/T18984 16MnDG steel pipe applies to -45 ° C grade low temperature pressure vessel pipelines and seamless steel tubes for low temperature heat exchanger pipelines

GB/T18984 16MnDG low temperature seamless steel pipe Quick Details

Company Name: Beite steel pipe

Country/Region: China

Material：16MnDG

FOB Price: US $1000-2000 / Ton | 1 Ton/Tons (Min. Order)

Port of Shipment：Tianjin,China

Payment：L/C or T/T

Delivery: 7-15 days after payment

Package：Standard export package,suit for all kinds of transport, or as required

Outside Diameter：12.7mm——219mm

Wall thickness：3.5mm——12.7mm

Length：6000mm、12000m or specified length as required.

Production method

Steel should be smelted in an oxygen converter or an electric furnace and refined outside the furnace. According to the requirements of the purchaser, it is negotiated between the supplier and the buyer and indicated in the contract. It can also be manufactured by other methods.

Steel pipes shall be manufactured by hot rolling (expansion) or cold drawing (rolling).

Delivery status

The steel pipe is delivered in a normalized state. When the finish rolling temperature is not lower than the phase transition critical temperature (Ar3), it can be regarded as normalizing treatment.

Chemical properties of GB/T18984 16MnDG Seamless Steel Pipe

Standard	Grade	C	Si	Mn	P(max)	S	Ni	Mo	V
GB/T18984	16MnDG	0.12-0.20	0.20-0.55	1.20-1.60	0.025	0.025	-	-	-

Longitudinal Mechanical Properties of GB/T18984 16MnDG Seamless Steel Pipe

Standard	Grade	Tensile strength	Lower yield strength（Rcl/Mpa）		Elongation
Standard	Grade	Rm/Mpa	W.T.<=16mm	W.T.>16mm	A/%
GB/T18984	16MnDG	490-665	>=325	>=315	>=30

Minimum impact test temperature of GB/T18984 16MnDG Seamless Steel Pipe

Grade	Minimum impact test temperature
Grade	℉	℃
16MnDG	--	-45

Surface Quality

The inner and outer surfaces of steel pipes shall not be folded, rolled, separated, cracked and crusted. These defects shall be completely removed and the actual wall thickness at the clearing shall not be less than the minimum allowable wall thickness.

Other local defects where the depth does not exceed the negative deviation of the wall thickness of the steel tube are allowed to exist.

Tolerances of outer diameter (D) and wall thickness (S) of steel pipe

Process	Size(mm)		Tolerance
Hot-rolled	O.D.	<351	+/-1.0% D(+/-0.50min)
	O.D.	>=351	+/-1.25% D
	W.T.	<=25	+/-12.5% S(+/-0.40 min)
Cold drawn	O.D.	<=30	+/-0.20
		30-50	+/-0.30
		>50	+/-0.75% D
	W.T.	<=3	+12.5% S, -10% S
	W.T.	>3	+/-10% S

Note: Outside diameter greater than or equal to 351 thermal Flaring wall thickness allowable deviation: Guests 15 write S

Performance Testing

Hydraulic test

Flattening test

Bending test

Flaring test

Low-order tissue test

Non-metallic inclusion inspection

Nondestructive testing

Factory Photo