| 牌号 | X6CrNi25-20 |
| 1.4951 | |
| 對應标準 | NF EN 10028-7-2000
壓力容器用不鏽鋼扁平產品 Flat products made of steels for pressure purposes Part 7: Stainless steels |
| 歸類 | 奧氏體不鏽鋼 |
| 标簽 | 标準等級 |
| 密度 | 7.9 g/cm3 |
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高溫下的最小屈服強度
Material designation Heat treatment
conditionMinimum 0.2% proof strength Rp0.2,MPa
at a temperature (in°C) of:Name Number 100 150 200 250 300 350 400 450 500 550 600 X6CrNi25-20 1.4951 +AT 140 128 116 108 100 94 91 86 85 84 82 Minimum 1.0% proof strength Rp1.0,MPa
at a temperature (in°C) of:100 150 200 250 300 350 400 450 500 550 600 185 167 154 146 139 132 126 123 121 118 114 -
高溫下的最小抗拉強度
Material designation Minimum tensile strength Rm,MPa
at a temperature (in°C) of:Name Number 100 150 200 250 300 350 400 450 500 550 600 X6CrNi25-20 1.4951 470 450 430 420 410 405 400 385 370 350 320
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熱處理指南
Material designation Hot forming Heat
treatment
symbolSolution anneailing
①②Post weld heat
treatment
Creep resisting steelsName Number Temperature
℃Type of
coolingTemperature
℃ ③④Type of
coolingTemperature
℃ ⑥Type of
coolingX6CrNi25-20 1.4951 1150 to 850 air +AT 1050 to 1150 water,air ⑤ not recommended - ◎ a=air; o=oil; w=water.
◎ Scale and annealing colours produced during hot forming, heat treatment or welding may adversely affect the corrosion resistance. They should be removed as far as possible before use, e.g. by pickling.
◎ The temperatures of annealing should be agreed for simulated heat treated test pieces.
① The solution treatment may be omitted if the conditions for hot working and subsequent cooling are such that the requirements for the mechanical properties of the product and the resistance to intergranular corrosion as defined in EN ISO 3651-2 are obtained and provided these requirements are met even after appropriate subsequent solution annealing.
② Re-crystallizing annealing.
③ If heat treatment is carried out in a continuous furnace, the upper part of the range specified is usually preferred, or even exceeded.
④ The lower end of the range specified for solution annealing should be aimed at for heat treatment as part of further processing,because otherwise the mechanical properties might be affected. If the temperature of hot forming does not drop below the lower temperature for solution annealing.a temperature of 980℃ is adequate as a lower limit for Mo-free steels,a temperature of 1000℃ for steels with Mo contents up to 3% and a temperature of 1020℃ for steets with Mo contents exceeding 3%.⑤ cooling sufficiently rapid.
⑥ Minimum holding time:30min.
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物理性能
Modulus of elasticity at Mean coefficient of thermal
expansion between 20 ℃ andThermal
conductivity
at 20℃Specific
thermal
capacity
at 20℃Specific electrical
resistivity
at 20℃20°C 100°C 200°C 300°C 400°C 500°C 600°C 700°C 800°C 900°C 1000°C 100°C 200°C 300°C 400°C 500°C 600°C 700°C 800°C 900°C 1000°C KN/mm2 10-6 K-1 W/m.K J/kg.K Ω.mm2/m 200 190 185 175 170 160 155 145 140 135 125 - 15.5 16.3 17.0 17.3 17.5 18 18.5 18.8 19 15 500 0.85 -
蠕變性能
Designation Heat treatment
conditionTemperature Strength for rupture in N/mm2 for ① Name Number °C 10000h 30000h 50000h 100000h 150000h 200000h 250000h X6CrNi25-20 1.4951 +AT 600 137 113 104 92 89 82 79 610 120 98 90 79 74 71 68 620 105 85 78 69 64 61 59 630 92 75 68 60 56 54 52 640 81 66 60 53 50 47 46 650 72 58 53 47 44 42 41 660 64 52 47 42 39 38 36 670 57 46 42 38 35 34 33 680 51 42 38 34 32 31 29 690 47 38 35 31 29 28 27 700 42 34 32 28 26 25 24 710 39 31 29 26 24 23 22 720 35 29 26 23.5 22 21 20 730 32 27 24.5 22 20 19.5 18.5 740 30 24.5 22.5 20 18.5 18 17 750 28 22.5 21 18.5 17 16.5 16 760 26 21 19 17 16 15 14.5 770 24 19.5 18 15.5 14.5 14 13.5 780 22 18 16.5 14.5 13.5 13 12.5 790 21 17 15.5 13.5 12.5 12 11.5 800 19.5 15.5 14 12.5 11.5 11 10.5 810 18 14.5 13 11.5 10.5 10 9.5 820 17 13.5 12 10.5 10 9.5 9 830 16 12.5 11.5 10 9 - - 840 15 12 10.5 9 - - - 850 14 11 10 - - - - 860 13 10 9 - - - - 870 12 9.5 - - - - - 880 11.5 9 - - - - - 890 10.5 - - - - - - 900 10 - - - - - - 910 9.5 - - - - - - ◎ Values were taken from BS PD 6525 Part 1.
① Values in parantheses involved time and/or stress extrapolation; values with asterisk involved time extrapolation.
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