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La composición química de STKM11, STKM12, STKM13 y STKM14 son como la tabla a continuación:
| Calificación | Composición química % | |||||
| C | Si | Minnesota | PAG | 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 | ||||||
Las propiedades mecánicas de STKM11, STKM12, STKM13 y STKM14 son como la tabla a continuación:
| Calificación | Propiedades mecánicas | Prueba de aplanamiento | Test de doblado | |||
| Resistencia a la tracción (MPA) | Fuerza de rendimiento (MPA) | Alargamiento (%) | Distancia entre que partes (D = OD) | Doblar Ángulo | Adentro Radio (D = OD) | |
| No.11: espécimen | ||||||
| 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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