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Komposisi kimia STKM11, STKM12, STKM13 dan STKM14 adalah seperti jadual di bawah:
| Gred | Komposisi kimia % | |||||
| C | SI | Mn | 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 | ||||||
Ciri -ciri mekanikal STKM11, STKM12, STKM13 dan STKM14 adalah seperti jadual di bawah:
| Gred | Sifat mekanikal | Ujian meratakan | Ujian lentur | |||
| Kekuatan tegangan (MPA) | Kekuatan hasil (MPA) | Pemanjangan (%) | Jarak antara bahagian itu (D = OD) | Bend Sudut | Dalam Jejari (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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