| 牌號 | X2CrNiN18-7 |
|---|---|
| 1.4318 | |
| 對應標準 | NF EN 10028-7-2008
壓力容器用不銹鋼扁平產品 Flat Products Made of Steels for Pressure Purposes - Part 7 : Stainless Steels |
| 歸類 | 奧氏體不銹鋼 |
| 標簽 | 耐腐蝕等級 |
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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 50① 100 150 200 250 300 350 400 450 500 550 600 X2CrNiN18-7 1.4318 +AT 309 265 200 185 180 170 165 - - - - - Minimum 1.0% proof strength Rp1.0,MPa
at a temperature (in°C) of:50① 100 150 200 250 300 350 400 450 500 550 600 - - 235 215 210 200 195 - - - - - ① Determined by linear interpolation.
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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 50① 100 150 200 250 300 350 400 450 500 550 600 X2CrNiN18-7 1.4318 605 530 490 460 450 440 430 - - - - - ① Determined by linear interpolation.
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熱處理指南
Material designation Hot forming Heat
treatment
symbolSolution anneailing
①②Post weld heat
treatment
Steel with ≤ 0.03% CName Number Temperature
℃Type of
coolingTemperature
℃ ③④Type of
coolingTemperature
℃ ⑥Type of
coolingX2CrNiN18-7 1.4318 1150 to 850 air +AT 1020 to 1100 water,air ⑤ 900 to 940 air ◎ 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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