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We are leading manufacturer and stockist of ASTM A 335 P91 High pressure boiler pipes in China.ASTM A 335 P91 High pressure boiler pipes?Heat Treatment Requirements P5,Website:http://www.petrosteels.com, P9, P11, and P22GradeHeat Treatment TypeNormalizing Temperature Range F [C]Subcritical Annealing or Tempering ? ? ?Temperature Range F [C]P5 (b,c)Full or Isothermal AnnealNormalize and Temper*****1250 [675]Subcritical Anneal (P5c only)*****1325 – 1375 [715 – 745]P9Full or Isothermal AnnealNormalize and Temper*****1250 [675]P11Full or Isothermal AnnealNormalize and Temper*****1200 [650]P22Full or Isothermal AnnealNormalize and Temper*****1250 [675]P91Normalize and Temper1900-1975 [1040 – 1080]1350-1470 [730 – 800]Quench and Temper1900-1975 [1040 – 1080]1350-1470 [730 – 800]ASTM A 335 P91 High pressure boiler pipes?Chemical Requirements GradeP-5P-9P-11P-22P-91P-91 shall also include the following:ElementUNS DesignationK41545S50400K11597K21590K91560Carbon0.15 max0.15 max0.05 – 0.150.05 – 0.150.08 – 0.12V at 0.18 – 0.25Manganese0.30 – 0.600.30 – 0.600.30 – 0.600.30 – 0.600.30 – 0.60N at 0.030 – 0.070Phosphorous, max0.0250.0250.0250.0250.020Ni at 0.40 maxSulfur, max0.0250.0250.0250.0250.010Al at 0.02 maxSilicon0.50 max0.25 – 1.000.50 – 1.000.50 max0.20 -0.50Cb at 0.06 – 0.10Chromium4.00 – 6.008.00 – 10.001.00 – 1.501.90 – 2.608.00 – 9.50Ti at 0.01 maxMolybdenum0.45 -0.650.90 – 1.100.44 – 0.650.87 – 1.130.85 – 1.05Zr at 0.01 maxASTM A 335 P91 High pressure boiler pipes?Tensile Requirements SeamlessP-5P-9P-11P-22P-91P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].Tensile Strength, min., psiksi6060606085MPa415415415415585Yield Strength, min., psiksi3030303060MPa205205205205415ASTM A 335 P91 High pressure boiler pipes?Permissible Variation in Wall Thickness NPS [DN] DesignatorTolerance, % from SpecifiedOverUnder1/8 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 W