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

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

Brand Name : TORICH

Model Number : GB/T20409

Certification : ISO

Place of Origin : Zhejiang,CHINA

MOQ : 2 Ton

Price : 1000-1500 USD/Ton

Payment Terms : L/C, D/A, D/P, T/T, Western Union, MoneyGram

Supply Ability : 50000Ton per year

Delivery Time : 30-35 work days

Packaging Details : packing in wooden boxes or in hexagonal bundles

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

Surface : Oiled

Usage : For High-pressure Boilers

Shape : Round Shape

Length : 8-12m

Material : 20G 20MnG 25MnG SA210 SA213

Type : Boiler Pipe

WT : 0.5-50mm

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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

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

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

Lower yield strength
GB/T20409 20G 20MnG 25MnG SA210 SA213 Precision Inside Rifle Steel Tube Seamless Steel Tubes/MPa((N/GB/T20409 20G 20MnG 25MnG SA210 SA213 Precision Inside Rifle Steel Tube Seamless Steel Tubes)

Elongation

A/%

Impact energy

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

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

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
GB/T20409 20G 20MnG 25MnG SA210 SA213 Precision Inside Rifle Steel Tube Seamless Steel Tubes Helix angle Rating Rating
T Thread top width (axial) ±1.3mm ±1.3mm
U Thread top (axial) groove width -- --
  1. 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.
  2. The rating is based on the axis of the pipe.

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

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


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