GB/T20409 20G 20MnG 25MnG SA210 SA213 Precision Inside Rifle Steel Tube Seamless Steel Tubes

Name: GB/T20409 20G 20MnG 25MnG SA210 SA213 Precision Inside Rifle Steel Tube Seamless Steel Tubes
Brand: TORICH INTERNATIONAL LIMITED

Price Negotiable

Price: 1000-1500 USD/Ton

MOQ: 2 Ton

Delivery Time: 30-35 work days

Brand: TORICH

Product Description

Product Name:TORICH GB/T20409 20G 20MnG 25MnG SA210 SA213 Multi-rifled High-pressure Boiler Seamless Steel Tubes

Standard: GB/T20409

OD: 3-420mm

WT: 0.5-50mm

Length: 8-12m or according to customers' actual application and production.

Application:High-pressure Boiler

Steel Grade:20G 20MnG 25MnG SA210 SA213

Technology:Hot rolled,cold rolled,cold drawn

Characteristic:

Good concentricity

Good surface quality

Good OD and ID tolerance

High Precision

Stable quality

Smooth Roughness

TORICH QUALITY ASSURANCE

Table6 Longitudinal mechanical properties of internal screw tubes at room temperature

Number	Grade	tensile strength / MPa(N/)	Lower yield strength /MPa((N/)	Elongation A/%	Impact energy /J
Number	Grade	tensile strength / MPa(N/)	Not less than
1	20G	410~550	245	24	35
2	20MnG	≥415	240	22	35
3	25MnG	≥485	275	20	35
4	12CrMoG	410~560	205	21	35
5	15CrMoG	440~640	235	21	35

Table4 The grade and chemical composition of steel

Number	Brand	chemical composition(mass fraction)/ %
Number	Brand	C	Mn	Si	Cr	Mo	S	P
1	20G	0.17~0.23	0.35~0.65	0.17~0.37	--	--	≤0.020	≤0.025
2	20MnG	0.17~0.23	0.70~1.00	0.17~0.37	--	--	≤0.020	≤0.025
3	25MnG	0.22~0.29	0.7~1.00	0.17~0.37	--	--	≤0.020	≤0.025
4	12CrMoG	0.08~0.15	0.40~0.70	0.17~0.37	0.40~0.70	0.40~0.55	≤0.020	≤0.025
5	15CrMoG	0.12~0.18	0.40~0.70	0.17~0.37	0.80~1.10	0.40~0.55	≤0.020	≤0.025
Note1:Residual element content of 20G,20MnG,25MnG should satisfy: Cu≤0.20%,Cr≤0.25%,Ni≤0.25%,V≤0.08%,Mo≤0.15%；The remaining elements of other brands should satisfy: Cu≤0.20%,Ni≤0.30%. Note2:The acid soluble aluminum in 20G steel should not be more than 0.010%. Note3:The nitrogen content of the steel produced by the oxygen converter plus the refining of the furnace should not be more than 0.008%.

The size of the internal screw tubes and the allowable deviation of the thread parameters

Code	Project	“A” teeth types allowable deviation	“B” teeth types allowable deviation
A	O.D≤38.1mm 38.1mm＜O.D＜50.8mm 50.8mm≤O.D≤63.5mm O.D≥63.5mm	±0.15mm ±0.20mm ±0.25mm ±0.30mm	--
B	O.D≤38.1mm 38.1mm＜O.D＜50.8mm 50.8mm≤O.D≤63.5mm O.D≥63.5mm	--	±0.15mm ±0.20mm ±0.25mm ±0.30mm
C	I.D of the root of the screw Thread: O.D-(1.11×Minimum W.T×2) O.D≤38.1mm 38.1mm＜O.D＜50.8mm 50.8mm≤O.D≤63.5mm O.D≥63.5mm	±0.15mm ±0.20mm ±0.25mm ±0.30mm	±0.15mm ±0.20mm ±0.25mm ±0.30mm
E	Minimum I.D	Negative deviation to zero	Negative deviation to zero
F	Minimum W.T	+22% 0	+22% 0
G	Thread tips	--	--
I	Thread top width	--	--
	Height of thread: O.D≤38.1mm 38.1mm＜O.D＜50.8mm 50.8mm≤O.D≤63.5mm O.D≥63.5mm	±0.3mm	±0.18mm ±0.20mm ±0.23mm ±0.28mm
K	Side Angle of thread.	±15°	±15°
O	radius of rounded corner at the root of thread	--	--
M	Thread pitch	±3.2mm	±3.2mm
N	Thread lead	±3.2mm×thread tips	±3.2mm×thread tips
	Helix angle	Rating	Rating
T	Thread top width (axial)	±1.3mm	±1.3mm
U	Thread top (axial) groove width	--	--
For the B type, the maximum deviation of any thread height can exceed the allowable deviation specified in the table, but it should not exceed the allowable deviation of 0.08mm, and the average height of all threads should be in line with the given deviation range. The rating is based on the axis of the pipe.