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La composizione chimica di STKM11, STKM12, STKM13 e STKM14 sono come la tabella seguente:
| Grado | Composizione chimica % | |||||
| C | Si | Mn | P | S | Nb o 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 | ||||||
Le proprietà meccaniche di STKM11, STKM12, STKM13 e STKM14 sono come la tabella seguente:
| Grado | Proprietà meccaniche | Test di appiattimento | Test di flessione | |||
| Resistenza alla trazione (MPA) | Forza di snervamento (MPA) | Allungamento (%) | Distanza fra Quelle parti (D = OD) | Curva Angolo | Dentro Raggio (D = OD) | |
| No.11: esemplare | ||||||
| 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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