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ASTM A 335/ A691 GR P91 Alloy Steel Seamless & EFW Pipes

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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.

astm a335 grade p91 Alloy Steel Seamless Pipes supplier in india

  • ASTM A 335 GR P91 Sizes (Seamless): 1/2” NB - 24” NB
  • ASTM A 335 GR P91 Wall Thickness available: Schedule 20 - Schedule XXS (heavier on request) up to 250 mm thk.
  • ASTM A 335 GR P91 Material Grades :
  • ASTM A 335 GR P91 Alloy Steel Seamless Pipe :
  • ASTM A 335 GR P91 Other Materials Testing :
  • NACE MR0175, H2 SERVICE, IBR, etc.
  • ASTM A 335 GR P91 Dimensions :

All Pipe is manufactured and inspected/tested to the relevant standards including ASTM, ASME, API.


ASTM A 335 GR P91 Heat Treatment Requirements

P5, P9, P11, and P22

Grade

Heat Treatment Type

Normalizing Temperature Range F [C]

Subcritical Annealing
or Tempering
Temperature Range F

[C]

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 Chemical Requirements

GradeP-5P-9P-11P-22P-91P-91 shall also include the following:
ElementUNS DesignationK41545S50400K11597K21590K91560
Carbon0.15 max0.15 max0.05 - 0.150.05 - 0.150.08 - 0.12V at 0.18 - 0.25
Manganese0.30 - 0.600.30 - 0.600.30 - 0.600.30 - 0.600.30 - 0.60N at 0.030 - 0.070
Phosphorous, max0.0250.0250.0250.0250.020Ni at 0.40 max
Sulfur, max0.0250.0250.0250.0250.010Al at 0.02 max
Silicon0.50 max0.25 - 1.000.50 - 1.000.50 max0.20 -0.50Cb at 0.06 - 0.10
Chromium4.00 - 6.008.00 - 10.001.00 - 1.501.90 - 2.608.00 - 9.50Ti at 0.01 max
Molybdenum0.45 -0.650.90 - 1.100.44 - 0.650.87 - 1.130.85 - 1.05Zr at 0.01 max

ASTM A 335 GR P91 Tensile Requirements

Seamless
P-5P-9P-11P-22P-91P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].
Tensile Strength, min., psi
ksi6060606085
MPa415415415415585
Yield Strength, min., psi
ksi3030303060
MPa205205205205415

ASTM A 335 GR P91 Permissible Variation in Wall Thickness

NPS [DN] DesignatorTolerance, % from Specified
OverUnder
1/8 to 2 1/2 [6 to 65] incl., all t/D ratios20.0%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)