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Komposisi kimia STKM11, STKM12, STKM13 dan STKM14 adalah sebagai tabel di bawah ini:
| Nilai | Komposisi kimia % | |||||
| C | Si | M N | P | S | NB atau V. | |
| Stkm11a | ≤0.12 | ≤0.35 | ≤0.60 | ≤0.040 | ≤0.040 | ▾ |
| Stkm12a | ≤0.20 | ≤0.35 | ≤0.60 | ≤0.040 | ≤0.040 | - |
| STKM12B | ||||||
| STKM12C | ||||||
| Stkm13a | ≤0.25 | ≤0.35 | 0.30 ~ 0,90 | ≤0.040 | ≤0.040 | - |
| STKM13B | ||||||
| STKM13C | ||||||
| Stkm14a | ≤0.30 | ≤0.35 | 0.30 ~ 1.00 | ≤0.040 | ≤0.040 | - |
| STKM14B | ||||||
| STKM14C | ||||||
Sifat mekanik STKM11, STKM12, STKM13 dan STKM14 adalah sebagai tabel di bawah ini:
| Nilai | Peralatan mekanis | Tes perataan | Tes Bending | |||
| Daya tarik (MPA) | Kekuatan luluh (MPA) | Perpanjangan (%) | Jarak di antara bagian itu (D = OD) | Membengkokkan Sudut | Di dalam Radius (D = OD) | |
| No.11: Spesimen | ||||||
| Stkm11a | 230 (294) | - | 235 | 1/2d | 180 ° | 4d |
| Stkm12a | 235 (343) | 218 (177) | 235 | 2/3d | 90 ° | 6d |
| STKM12B | 240 (392) | 228 (275) | 225 | 2/3d | 90 ° | 6d |
| STKM12C | 248 (471) | 236 (353) | 220 | - | - | - |
| Stkm13a; | 238 (373) | 222 (216) | 230 | 2/3d | 90 ° | 6d |
| STKM13B | 245 (441) | 231 (304) | 220 | 3/4d | 90 ° | 6d |
| STKM13C | 252 (510) | 239 (382) | 215 | - | - | - |
| Stkm14a | 242 (412) | 225 (245) | 225 | 3/4d | 90 ° | 6d |
| STKM14B | 251 (500) | 236 (353) | 215 | 7/8d | 90 ° | 8d |
| STKM14C | 256 (549) | 242 (412) | 215 | - | - | - |
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