Steel plate for for Boiler Pressure Vessel DIN17165 HII steel
HII steel plate, DIN17165 HII steel plates is a kind of material for boiler and pressure vessel steel. DIN17165 HII steel plates is characterized by a minimum yield strength of 185 - 265 MPa and by good weldability, so HII steel is mainly used to for manufacturing boilers, pressure vessels and pipes transporting hot liquids. the following are DIN17165 HII steel plate's Chemical composition and mechanical properties.
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Chemical analysis -% by mass* (max) of HII steel plate
| Grade | C. % | Mn.% | S. | N | Cu | Nb | Ti. | Si. | P. | AL | Cr. | Mo. | Ni | Vi |
| HII | 0.20 | 0.80-1.40 | 0.015 | 0.012 | 0.30 | 0.020 | 0.03 | 0.40 | 0.025 | 0.020 | 0.30 | 0.08 | 0.30 | 0.02 |
Mechanical properties of HII steel plate
| Grade | Type | Thickness mm | Yield strength Mpa(min) | Tensile Strength MPa | Elongation % (min) | Impact Energy (KVJ) (min) | ||
| -20° | 0° | +20 | ||||||
| HII | Normalized | ≤16 16 > to≤40 40 > to≤60 60 > to≤100 100 > to≤150 150 > to≤250 | 265 | 410-530 | 22 | 27 | 34 | 40 |
| 255 | 410-530 | 22 | 27 | 34 | 40 | |||
| 245 | 410-530 | 22 | 27 | 34 | 40 | |||
| 215 | 410-530 | 22 | 27 | 34 | 40 | |||
| 200 | 400-530 | 22 | 27 | 34 | 40 | |||
| 185 | 390-530 | 22 | 27 | 34 | 40 | |||
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