We always believe that one's character decides products' quality, the details decides products' high-quality ,together with the REALISTIC,EFFICIENT AND INNOVATIVE crew spirit for Excellent quality A335/A213/A519 Gr. T11/T22 Cold Drawn Alloy Seamless Steel Pipe, Welcome mates from all over the globe come to go to, manual and negotiate.
We always believe that one's character decides products' quality, the details decides products' high-quality ,together with the REALISTIC,EFFICIENT AND INNOVATIVE crew spirit for
China Alloy Pipe and Alloy Tube, By integrating manufacturing with foreign trade sectors, we can offer total customer solutions by guaranteeing the delivery of right items to the right place at the right time, which is supported by our abundant experiences, powerful production capability, consistent quality, diversified product portfolios and the control of the industry trend as well as our mature before and after sales services. We'd like to share our ideas with you and welcome your comments and questions.
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
We always believe that one's character decides products' quality, the details decides products' high-quality ,together with the REALISTIC,EFFICIENT AND INNOVATIVE crew spirit for Excellent quality A335/A213/A519 Gr. T11/T22 Cold Drawn Alloy Seamless Steel Pipe, Welcome mates from all over the globe come to go to, manual and negotiate.
Excellent quality China Alloy Pipe and Alloy Tube, By integrating manufacturing with foreign trade sectors, we can offer total customer solutions by guaranteeing the delivery of right items to the right place at the right time, which is supported by our abundant experiences, powerful production capability, consistent quality, diversified product portfolios and the control of the industry trend as well as our mature before and after sales services. We'd like to share our ideas with you and welcome your comments and questions.