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La composition chimique de STKM11, STKM12, STKM13 et STKM14 est le tableau ci-dessous:
| Grade | Composition chimique % | |||||
| C | Si | MN | P | S | NB ou 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 | ||||||
Les propriétés mécaniques de STKM11, STKM12, STKM13 et STKM14 sont comme le tableau ci-dessous:
| Grade | Propriétés mécaniques | Test d'aplatissement | Test de flexion | |||
| Résistance à la traction (MPA) | Limite d'élasticité (MPA) | Allongement (%) | Distance entre que les parties (D = od) | Plier Angle | À l'intérieur Rayon (D = od) | |
| No.11: spécimen | ||||||
| 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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