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

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

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Product Details:

Place of Origin: Zhejiang,CHINA
Brand Name: TORICH
Certification: ISO
Model Number: GB/T20409

Payment & Shipping Terms:

Minimum Order Quantity: 2 Ton
Price: 1000-1500 USD/Ton
Packaging Details: packing in wooden boxes or in hexagonal bundles
Delivery Time: 30-35 work days
Payment Terms: L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability: 50000Ton per year
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Detailed Product Description
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

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

Contact Details
TORICH INTERNATIONAL CO.,LTD

Contact Person: Jack Jiang

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