TORICH GB/T 18984 Seamless Steel Tubes For Low Temperature Service Piping

Price Negotiable

Price: negotiable

MOQ: 3 Ton

Delivery Time: 30 days

Brand: TORICH

Product Description

TORICH GB/T 18984 Seamless Steel Tubes For Low-Temperature-Service Piping

Application:For Low-Temperature-Service Piping

Material:16MnDG,10MnDG,09DG,09Mn2VDG,06Ni3MoDG
Unit:mm

Hot Roll(Extrusion,Expansion)Steel Tube				Cold Drawn(Roll) Steel Tube
Diamension		Tolerance		Diamension		Tolerance
		Ordinary Level PA	High Level PC			Ordinary Level PA	High Level PC
Nominal Outer Diameter D	＜76.1	±1.25%D	±0.60	Nominal Outer Diameter D	＜12.7	±0.30	±0.10
	76.1~＜139.7		±0.80		12.7~＜38.1	±0.30	±0.15
	139.7~＜273.1	±1.5%D	±1.20		38.1~＜88.9	±0.40	±0.30
					88.9~＜139.7	±0.9%D	±0.40
	273.1~＜323.9		±1.60		139.7~＜203.2		±0.80
					203.2~＜219.1		±1.10
	≥323.9		±0.6%D		219.1~＜323.9		±1.60
					≥323.9		±0.5%D
Nominal Wall Thinckness S	All Wall Thickness	+15%S -12.52%S	±12.5%S	Nominal Wall Thinckness S	All Wall Thickness	+12.5%S -10%S	±10%S

Permissible deviation tolerance of OD and WT

Classfication	Steel size		Permissible tolerance
W-H	OD	＜351	±1.0%D
	OD	≥351	±1.25%D
	WT	≤25	±12.5%S
W-C	OD	≤30	±0.20
		＞30~50	±0.30
		＞50	±0.75%D
	WT	≤3	＋12.5%S -10%S
	WT	＞3	±10%S

Steel grade and chemical composition

Steel grade	Chemical composition/%
Steel grade	C	Si	Mn	P	S	Ni	Mo	V
16MnDG	0.12~0.20	0.20~0.55	1.20~1.60	≤0.025	≤0.025	—	—	—
10MnDG	≤0.13	0.17~0.37	≤1.35	≤0.025	≤0.025	—	—	≤0.07
09DG	≤0.12	0.17~0.37	≤0.95	≤0.025	≤0.025	—	—	≤0.07
09Mn2VDG	≤0.12	0.17~0.37	≤1.85	≤0.025	≤0.025	—	—	≤0.12
06Ni3MoDG	≤0.08	0.17~0.37	≤0.85	≤0.025	≤0.025	—	—	≤0.05

Longitudinal mechanical properties of steel tubes

Steel grade	Tensile strength / MPa	Lower yield strength R_p0.2/MPa		Elongation A/％
		S≤16mm	S＞16mm	Sample 1	Sample 2	Sample 3
16MnDG	490~665	≥325	≥315	≥30
10MnDG	≥400	≥240		≥35
09DG	≥385	≥210		≥30
09Mn2VDG	≥450	≥300		≥30
06Ni3MoDG	≥455	≥250		≥30

Testing items and sampling quantity of steel tubes

Number	Testing items	Sampling quantity
1	Chemical composition	1 sample from each furnace
2	Tensile test	1 sample from each of two steel tubes on each batch
3	Hardness test	1 sample from each of two steel tubes on each batch
4	Ultrasonic testing	ALL
5	Hydraulic test	ALL