Seamless Alloy Steel Boiler Pipes Superheater alloy pipes Heat Exchanger Tubes

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 GB/T5310-2017 ASME SA-106/SA-106M-2015 ASTMA210(A210M)-2012 ASME SA-213/SA-213M ASTM A335/A335M-2018