We support our consumers with ideal high-quality goods and substantial level support. Becoming the specialist manufacturer in this sector, we now have acquired abundant practical encounter in producing and managing for factory Outlets for China Seamless Steel Pipe as Per ASTM A213, We will do your personalized purchase to meet your own satisfactory! Our business sets up several departments, including output department, revenue department, excellent control department and sevice center, etc.
We support our consumers with ideal high-quality goods and substantial level support. Becoming the specialist manufacturer in this sector, we now have acquired abundant practical encounter in producing and managing for
China Seamless Tube,
seamless steel tube, We set "be a creditable practitioner to achieve the continuous development and innovation" as our motto. We would like to share our experience with friends at home and abroad, as a way to create a bigger cake with our joint efforts. We have several experienced R & D persons and we welcome OEM orders.
Overview
Application
It is mainly used to make high-quality alloy steel pipe for high pressure boiler pipe, heat exchanger pipe and super heat pipe
Main Grade
Grade of high-quality Alloy steel: T2,T12,T11,T22, T91, T92 etc.
Chemical Component
| Steel Grade |
Chemical Composition% |
|
C |
Si |
Mn |
P, S Max |
Cr |
Mo |
Ni Max |
V |
Al Max |
W |
B |
| T2 |
0.10~0.20 |
0.10~0.30 |
0.30~0.61 |
0.025 |
0.50~0.81 |
0.44~0.65 |
– |
– |
– |
– |
– |
| T11 |
0.05~0.15 |
0.50~1.00 |
0.30~0.60 |
0.025 |
1.00~1.50 |
0.44~0.65 |
– |
– |
– |
– |
– |
| T12 |
0.05~0.15 |
Max 0.5 |
0.30~0.61 |
0.025 |
0.80~1.25 |
0.44~0.65 |
– |
– |
– |
– |
– |
| T22 |
0.05~0.15 |
Max 0.5 |
0.30~0.60 |
0.025 |
1.90~2.60 |
0.87~1.13 |
– |
– |
– |
– |
– |
| T91 |
0.07~0.14 |
0.20~0.50 |
0.30~0.60 |
0.02 |
8.0~9.5 |
0.85~1.05 |
0.4 |
0.18~0.25 |
0.015 |
– |
– |
| T92 |
0.07~0.13 |
Max 0.5 |
0.30~0.60 |
0.02 |
8.5~9.5 |
0.30~0.60 |
0.4 |
0.15~0.25 |
0.015 |
1.50~2.00 |
0.001~0.006 |
For T91 other than above also includes Nickel 0.4, Va 0.18-0.25, Ni 0.06-0.10, Ni 0.03-0.07, Al 0.02, Ti 0.01, Zr 0.01. A Maximum, unless range or minimum is indicated. Where ellipses (...) appear in this table, there is no requirement, and analysis for the element need not be determined or reported. B It is permissible to order T2 and T12 with a sulfur content of 0.045 max. C Alternatively, in lieu of this ratio minimum, the material shall have a minimum hardness of 275 HV in the hardened condition, defined as after austenitizing and cooling to room temperature but prior to tempering. Hardness testing shall be performed at mid-thickness of the product. Hardness test frequency shall be two samples of product per heat treatment lot and the hardness testing results shall be reported on the material test report.
Mechanical Property
| Steel Grade |
Mechanical Properties |
| T. S |
Y. P |
Elongation |
Hardness |
| T2 |
≥ 415MPa |
≥ 205MPa |
≥ 30% |
163HBW(85HRB) |
| T11 |
≥ 415MPa |
≥ 205MPa |
≥ 30% |
163HBW(85HRB) |
| T12 |
≥ 415MPa |
≥ 220MPa |
≥ 30% |
163HBW(85HRB) |
| T22 |
≥ 415MPa |
≥ 205MPa |
≥ 30% |
163HBW(85HRB) |
| T91 |
≥ 585MPa |
≥ 415MPa |
≥ 20% |
250HBW(25HRB) |
| T92 |
≥ 620MPa |
≥ 440MPa |
≥ 20% |
250HBW(25HRB) |
Tolerance
Permitted Variations in Wall thickness
| Wallthickess % |
| outside
diameter
in.
mm |
0.095
2.4
and under |
over0.095
to 0.15
2.4-3.8
incl. |
over 0.15
to 0.18
3.8-4.6
incl |
over 0.18
to 4.6 |
|
| over under over under over under over under |
| seamless, hot finished |
| 4inch and under 40 0 35 0 33 0 28 0 |
| over 4 inch .. .. 35 0 33 0 28 0 |
| seamless, cold finished |
|
|
over under |
|
|
|
| 11/2 and under |
|
20 0 |
|
|
|
| over 11/2 |
|
22 0 |
|
|
|
The permitted variations in wall thickness apply only to tube , except internal-upset tubes, as rolled or cold finished
and before swaging,expanding ,bending,polishing,or other fabricating operations
Permitted Variations in Outside Diameter
| outside diameter （mm) |
Pemitted Variation( mm) |
| hot finished seamless tube |
over |
under |
| 4" (100mm)and under |
0.4 |
0.8 |
| 4-71/2"(100-200mm） |
0.4 |
1.2 |
| 71/2-9“（200-225） |
0.4 |
1.6 |
| Welded tubes and cold finished seamless tubes |
|
|
| under1"(25mm) |
0.1 |
0.11 |
| 1-11/2"(25-40mm) |
0.15 |
0.15 |
| 11/2-2"(40-50mm) |
0.2 |
0.2 |
| 2-21/2"(50-65mm) |
0.25 |
0.25 |
| 21/2-3"(65-75mm) |
0.3 |
0.3 |
| 3-4"(75-100mm) |
0.38 |
0.38 |
| 4-71/2"(100-200mm） |
0.38 |
0.64 |
| 71/2-9“（200-225） |
0.38 |
1.14 |
Test Requirement
Hydraustatic Test:
The Steel Pipe Should Be Tested Hydraulically One By One. The Maximum Test Pressure Is 20 MPa. Under The Test Pressure, The Stabilization Time Should Be Not Less Than 10 S, And The Steel Pipe Should Not Leak. Or The Hydraulic Test Can Be Replaced By Eddy Current Testing Or Magnetic Flux Leakage Testing.
Nondestructive Test：
Pipes That Require More Inspection Should Be Ultrasonically Inspected One By One. After The Negotiation Requires The Consent Of The Party And Is Specified In The Contract, Other Non-Destructive Testing Can Be Added.
Flattening Test：
Tubes With An Outer Diameter Greater Than 22 Mm Shall Be Subjected To A Flattening Test. No Visible Delamination, White Spots, Or Impurities Should Occur During The Entire Experiment.
Hardness Test:
For Pipe Of Grades P91, P92, P122, And P911, Brinell, Vickers, Or Rockwell Hardness Tests Shall Be Made On A Specimen From Each Lot
Product Detail
Boiler Tube