IBR NACE MR0175 ASTM A 335 GR P91 ALLOY STEEL SEAMLESS PIPES
Silver Tubes is one of the oldest Manufacturer, Exporter and Supplier of High Quality ASTM A 335/ A691 GR P91 Alloy Steel Seamless & EFW Pipes . We provide a wide range of ASTM A 335/ A691 GR P91 Alloy Steel Seamless & EFW Pipes in Seamless, Welded, SAW, LSAW, DSAW etc. Our range comprises of ASTM A 335/ A691 GR P91 Alloy Steel Seamless & EFW Pipes . Available in different dimensions & grades, these ASTM A 335/ A691 GR P91 Alloy Steel Seamless & EFW Pipes are widely used in different industries like Dairy, Food processing, engineering, construction and many more. We also offer competitive range of ASTM A 335/ A691 GR P91 Alloy Steel Seamless & EFW Pipes as per client’s requirement. Silver Tubes is Approved Manufacturer & supplier of ASTM A 335/ A691 GR P91 Alloy Steel Seamless & EFW Pipes.
In the global market, Silver Tubes is engaged in manufacturing, exporting and supplying commendable quality of ASTM A 335/ A691 GR P91 Alloy Steel Seamless & EFW Pipes. These pipes are made available to them at different standards and specifications according to the clients’ demands for satisfying applications wants. The product we provide is developed as per set production norms and also complies product quality standards. A335 P91 is a mixture of molybdenum (9%) and chromium (1%). Chromium enhances the temperature strength and increases oxidation resistance of material P91. Molybdenum increases creep resistance strength material SA335p91. The presence of manganese and nickel in smaller proportion increases harden-ability of material ASTM A335P91. P91 welding molybdenum-chromium steel is an important material used in power plants. A335P91 is formed through normalizing at temperature 1050 Deg C air cooling down to temperature 200 Deg C. Then it is tempered through heating at a temperature ranging 760 Deg C. For enhancing the mechanical properties of A691 GR91 steel is alloyed with the ranges of elements in the proportion of 1.0%-50% by weight for producing alloy steel. Alloy steel addition to carbon contains a substantial amount of elements including molybdenum, nickel, tungsten, chromium, molybdenum, vanadium, silicon and phosphorus. Addition of those complements steel with increased strength, hardness and resistance to the chemical. The product testing of alloy steel seamless and EFW pipes are done carefully to check the product strength and quality. Few tests done is hardness test, mechanical-chemical test, macro test, micro test, flaring test, flattening test, pitting resistance, PMI test, and IGC test.
All Pipe is manufactured and inspected/tested to the relevant standards including ASTM, ASME, API. P5, P9, P11, and P22 Grade Heat Treatment Type Normalizing Temperature Range F [C] Subcritical Annealing P5 (b,c) Full or Isothermal Anneal Normalize and Temper ***** 1250 [675] Subcritical Anneal (P5c only) ***** 1325 - 1375 [715 - 745] P9 Full or Isothermal Anneal Normalize and Temper ***** 1250 [675] P11 Full or Isothermal Anneal Normalize and Temper ***** 1200 [650] P22 Full or Isothermal Anneal Normalize and Temper ***** 1250 [675] P91 Normalize and Temper 1900-1975 [1040 - 1080] 1350-1470 [730 - 800] Quench and Temper 1900-1975 [1040 - 1080] 1350-1470 [730 - 800]ASTM A 335 GR P91 Heat Treatment Requirements
or Tempering
Temperature Range F
[C]ASTM A 335 GR P91 Chemical Requirements
Grade P-5 P-9 P-11 P-22 P-91 P-91 shall also include the following: Element UNS Designation K41545 S50400 K11597 K21590 K91560 Carbon 0.15 max 0.15 max 0.05 - 0.15 0.05 - 0.15 0.08 - 0.12 V at 0.18 - 0.25 Manganese 0.30 - 0.60 0.30 - 0.60 0.30 - 0.60 0.30 - 0.60 0.30 - 0.60 N at 0.030 - 0.070 Phosphorous, max 0.025 0.025 0.025 0.025 0.020 Ni at 0.40 max Sulfur, max 0.025 0.025 0.025 0.025 0.010 Al at 0.02 max Silicon 0.50 max 0.25 - 1.00 0.50 - 1.00 0.50 max 0.20 -0.50 Cb at 0.06 - 0.10 Chromium 4.00 - 6.00 8.00 - 10.00 1.00 - 1.50 1.90 - 2.60 8.00 - 9.50 Ti at 0.01 max Molybdenum 0.45 -0.65 0.90 - 1.10 0.44 - 0.65 0.87 - 1.13 0.85 - 1.05 Zr at 0.01 max ASTM A 335 GR P91 Tensile Requirements
Seamless P-5 P-9 P-11 P-22 P-91 P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC]. Tensile Strength, min., psi ksi 60 60 60 60 85 MPa 415 415 415 415 585 Yield Strength, min., psi ksi 30 30 30 30 60 MPa 205 205 205 205 415 ASTM A 335 GR P91 Permissible Variation in Wall Thickness
NPS [DN] Designator Tolerance, % from Specified Over Under 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios 20.0% 12.5% Above 2 1/2 [65], t/D < or = 5% 22.5% 12.5% Above 2 1/2 [65], t/D > 5% 15.0% 12.5% (t = Specified Wall Thickness; D = Specified Outside Diameter)
