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Multi-rifled Seamless Steel Tubes for High-pressure Boiler
  • Multi-rifled Seamless Steel Tubes for High-pressure Boiler
  • Multi-rifled Seamless Steel Tubes for High-pressure Boiler
  • Multi-rifled Seamless Steel Tubes for High-pressure Boiler
Payment Type: L/C,T/T,D/P,Paypal,Money Gram,Western Union
Terms of Trade: FOB,CFR,CIF,FCA,CPT
Min. Order: 0.5 Ton
Delivery Time: 30-40 Days
Packaging: In bundles In wooden boxes
Productivity: 60000 Tons per Year
Transportation: Ocean,Land,Air
Place of Origin: China
Supply Ability: 60000 Tons per Year
Certificate: ISO 9001 ISO 14001 TS 16949 EN 10204.3.1 LR KR
HS Code: 7304311000
Port: Shanghai,Ningbo
Basic Info

Model No.: GB/T 20409

Product Description

Multi-rifled Seamless Steel Tubes for High-pressure Boiler

Application:High-quality carbon structural steel, alloy structural steel cold-drawing or cold-rolled internal thread tube for boilers suitable for producing high pressure and above pressure\


Surface Quality:
1.The internal and external surfaces of female threaded tubes are not allowed to have cracks, folds, knots, folds, and delaminations. These defects should be completely removed. The depth of defect removal should not exceed 10% of the wall thickness, and the actual wall thickness at the filling removal site should not be less than the wall thickness. The minimum allowable thickness deviation, the clearance should be rounded off
2.The shape of the thread should be kept intact. There must be no drawing, curling or collapse.
3.The inner and outer straight surfaces of internally threaded tubes (including non-sharpened core rods) shall be allowed to have a depth of not more than 4% of the minimum wall thickness and a maximum of 0.2 mm.
4.Other local imperfections that do not exceed the wall thickness to allow negative deviations are allowed to exist.
5.Oxide scales on the inner and outer surfaces of the internally threaded tube should be removed so that the thin oxide layer does not interfere with the inspection.

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








I.D of the root of the screw Thread:
O.D-(1.11×Minimum W.T×2)



E Minimum I.D Negative deviation to zero Negative deviation to zero
F Minimum W.T



G Thread tips -- --
I Thread top width -- --

Height of thread:



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 -- --
  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.




Torich International Limited--The Steel Tube Maker

  Who We are ?
-------A professional steel pipes materials inventor, manufacturer and solution provider Torich Interational Limited is a professional manufacturer and exporter of steel pipes materials.
It is an international marketing and sales company specialized in steel tubes, which holds the factories of Seamless Steel Tubes with Carbon and Alloy Steel Grade, Welded Precision Steel Tubes,DOM Steel Tubes, Seamless & Welded Stainless Steel Tubes with Nickel and Alloy Steel Grade.

Our factory was established since 1997, with the name of Haiyan Sanxin Steel Pipe Co., Ltd. The factories` technicians are of great engineering experience in steel pipe industry for more than 20 years, which are in great command of production technology for Cold Drawing and Cold Rolling. So we have strong technician team and manufacturing capability.

What products we do?
------- Invent and produce various Precision Steel Pipes Our steel pipes cover the following ranges:
Seamless Precision Steel Pipes
Welded Precision Steel Pipes, with DOM production
Seamless Heat Exchanger Steel Pipe
Seamless Boiler Steel Pipes
Seamless Structural Steel Pipes
Seamless Mechanical Steel Pipes
Seamless Alloy Steel Tubes & Pipes
Seamless Stainless Steel tubes
Welded Stainless Steel Tubes
Seamless Stainless Steel Tubes & Pipes
Welded Stainless Steel Tubes & Pipes
Seamless Carbon Steel Tubes & Pipes

Nickel Alloy Steel Tubes & Pipes

Products Application:
Oil Cylinders Air Cylinder,
Automotive Cylinder Liners Boilers,
Pressure Vessels Shell & Heat Exchangers
Jack Lifting
Telescopic Systems
Pneumatic Cylinders

Agricultural Machineries

Size range is:
O.D. 4-350mm, W.T. 0.5-30mm,

according to customer`s requirement and agreement

Steel Grade:
Carbon Steel Grade:

ST35.8, ST37.0, ST44, ST52; E155, E195, E215, E235, E275, E355; 195GH, P235GH, P265GH, P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, P265TR2; SAE1010, SAE1020, SAE1026, SAE1035, SAE1045;

Carbon steel tube:
SA178, A179, A192, A210, SA213, SA214, etc.

Alloy Steel Grade:
T2, T5, T9, T11, T12, T17, T21, T22, T91,T92,
15Mo3,16Mo3, 13CrMo44;
SAE4130, SAE4140, 40Cr, 40Cr4, 10CrMo910, 12CrMo910, 11CrMo910,
25CrMo4, 35CrMo, 35CrMo4, 42CrMo4, 34CrMo4, 20MnV, 20MnV6,20CrMn;

Carbon steel tube:


Nickel Alloy Grade:
N02200/2201, N04400, N06600, N06601, N06625, N06852, N06219, N06690,
N08800/8810/8811, N08825, N08028, N08535, N08904, N08925, N08926, N010276, N06022, etc.

Austenitic/Super Austenitic Stainless Steel Grade:
304/304L, 316/316L, 314, 321, 347H, 316Ti, 316LMod, 317L/N, 310S, 253MA, 330, 904L, S31254, XM-19, etc.

Ferrite/Martensitic Stainless Steel Grade:
TP410, TP405, TP420, TP430, TP430Ti, TP403, TP409, TP444, TP439, TP446, etc.

Duplex/Super Duplex Stainless Steel Grade:

S31803, S32304, S31500, S32550, S32750, S32760, etc.

Corporate Culture:

We focus on Quality First, Quality Traceability, and Quality Stability! We focus on Customer First, People First, and Quality-Oriented! Success: First factory started in 1997, in the name of Haiyan Sanxin Steel Tube Co.,Ltd, now covers 50000 square meters of factory building, with more than 100employees, and over 45 million RBM assets. In 2008, we started the company of Torich International Co.,Ltd for international business and marketing. Welcome partners from all over the world for long term cooperation!

TORICH Target:
To be the No.1 One-Stop Purchase Platform, Preferred Vendor and Comprehensive Supplier for Steel Tubes,Steel Material, Steel Parts,CNC machinine parts, Automotive Parts

TORICH Vision:

  • Sell the Chinese Quality-Products Worldwide.
  • Marketing TORICH to worldwide, make TORICH to be the 1st option and priority for Foreign Cusomters purchasing from China.
  • Make TORICH and TIMELY to be a name and a fame worldwide.
  • Make TORICH and TIMELY to be a Respectable and Reliable company

TORICH Mission:

  • Make Customers to Purchase Easy from China.
  • Marketing Chinese Quality-Products worldwide.
  • Reduce Customers' Purchasing Costs and Risks to purchase from China.
  • Buy Globally, Sell Globally


  • Dependable and Honesty to our partners.
  • Non-Stop Study.
  • Dedicate to the jobe and Love the job.
  • 100% passion.
  • Mutual Respect & Mutual Love.
  • Cooperation & Win-Win.
  • Realize Employee's Value, Serve Every Customer who Trust TORICH.

Company Info
  • Company Name: Torich International Limited--The Steel Tube Maker
  • Representative: Richard
  • Product/Service: Seamless Steel Tubes , Precision Steel Tubes , Hydraulic Cylinder Steel Tubes , DOM steel tubes , Stainless Steel Tubes , Special Pipe and Tubes
  • Capital (Million US $): 8.5 Million RMB
  • Year Established: 1997
  • Total Annual Sales Volume (Million US $): US$10 Million - US$50 Million
  • Export Percentage: 31% - 40%
  • Total Annual Purchase Volume (Million US $): US$10 Million - US$50 Million
  • No. of Production Lines: 16
  • No. of R&D Staff: 5 -10 People
  • No. of QC Staff: 5 -10 People
  • OEM Services Provided: yes
  • Factory Size (Sq.meters): 30,000-50,000 square meters
  • Factory Location: Daqiao Developing Zone Haiyan,Zhejiang
  • Contact Person: Mr. Richard SHEN
  • Tel: 86-574-88255925
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