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Steel Mills produce and store Steel.
Upgrade to increase Steel production output and Steel capacity
Resources produced by resource buildings aren’t included in Depot Protection. We recommend you collect them without delay.
Steel Mill upgrade Requirements:
Lv. = Level
F = Food
O = Oil
S = Steel
M = Minerals
U = Uranium
R = Requirement (MH = Main Hall)
SO = Steel Output in 1 hour
SC = Steel Capacity
BP = Battle Power
BCT = Base Construction Time
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| Lv. | F | O | S | M | U | R | SO | SC | BP | BCT |
| 1 | 130 | 130 | – | – | – | MH Lv.1 | 80 | 8,00 | 1 | 0:00 |
| 2 | 270 | 270 | – | – | – | MH Lv.2 | 102 | 1,020 | 4 | 0:00 |
| 3 | 340 | 340 | – | – | – | MH Lv.3 | 126 | 1,260 | 11 | 0:00 |
| 4 | 480 | 480 | – | – | – | MH Lv.4 | 152 | 1,520 | 24 | 0:00 |
| 5 | 720 | 720 | – | – | – | MH Lv.5 | 180 | 1,800 | 45 | 0:00 |
| 6 | 1,120 | 1,120 | – | – | – | MH Lv.6 | 210 | 2,100 | 76 | 8:00 |
| 7 | 2,030 | 2,030 | – | – | – | MH Lv.7 | 242 | 2,420 | 120 | 16:00 |
| 8 | 3,590 | 3,590 | – | – | – | MH Lv.8 | 276 | 2,760 | 180 | 24:00 |
| 9 | 6,240 | 6,240 | – | – | – | MH Lv.9 | 312 | 3,120 | 259 | ? |
| 10 | 12,490 | 12,490 | – | – | – | MH Lv.10 | 350 | 3,500 | 360 | ? |
| 11 | 25,290 | 25,290 | – | – | – | MH Lv.11 | 390 | 3,900 | 486 | ? |
| 12 | 44,580 | 44,580 | – | – | – | MH Lv.12 | 432 | 4,320 | 641 | ? |
| 13 | 66,070 | 66,070 | – | – | – | MH Lv.13 | 476 | 4,760 | 829 | ? |
| 14 | 103,070 | 103,070 | – | – | – | MH Lv.14 | 522 | 5,220 | 1,054 | ? |
| 15 | 149,200 | 149,200 | – | – | – | MH Lv.15 | 570 | 5,700 | 1,320 | ? |
| Lv. | F | O | S | M | U | R | SO | SC | BP | BCT |
| 16 | 212,260 | 212,260 | – | – | – | MH Lv.16 | 620 | 6,200 | 1,631 | ? |
| 17 | 281,260 | 281,260 | – | – | – | MH Lv.17 | 672 | 6,720 | 1,992 | ? |
| 18 | 370,500 | 370,500 | – | – | – | MH Lv.18 | 726 | 7,260 | 2,408 | ? |
| 19 | 461,350 | 461,350 | – | – | – | MH Lv.19 | 782 | 7,820 | 2,884 | ? |
| 20 | 537,830 | 537,830 | – | – | – | MH Lv.20 | 840 | 8,400 | 3,425 | ? |
| Lv. | F | O | S | M | U | R | SO | SC | BP | BCT |
| 21 | 602,810 | 602,810 | – | – | – | MH Lv.21 | 900 | 9,000 | 4,036 | ? |
| 22 | 674,790 | 674,790 | – | – | – | MH Lv.22 | 962 | 9,620 | 4,772 | ? |
| 23 | 770,760 | 770,760 | – | – | – | MH Lv.23 | 1,026 | 10,260 | 5,489 | ? |
| 24 | 880,730 | 880,730 | – | – | – | MH Lv.24 | 1,092 | 10,920 | 6,343 | ? |
| 25 | 1,005,190 | 1,005,190 | – | – | – | MH Lv.25 | 1,160 | 11,600 | 7,290 | ? |
| 26 | 1,147,150 | 1,147,150 | – | – | – | MH Lv.26 | 1,230 | 12,300 | 8,336 | ? |
| 27 | 1,308,600 | 1,308,600 | – | – | – | MH Lv.27 | 1,302 | 13,020 | 9,487 | ? |
| 28 | 1,466,050 | 1,466,050 | – | – | – | MH Lv.28 | 1,376 | 13,760 | 10,749 | ? |
| 29 | 1,641,490 | 1,641,490 | – | – | – | MH Lv.29 | 1,452 | 14,520 | 12,128 | ? |
| 30 | 1,838,280 | 1,838,280 | – | – | – | MH Lv.30 | 1,530 | 15,300 | 13,630 | ? |
| Lv. | F | O | S | M | U | R | SO | SC | BP | BCT |
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