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| Grade of mechanical performance standard table | ||||||||
| Reference Standard | Grade | Model Specification | Tensile Strength Rm (Mpa) | Yield Strength A (Mpa) | Elongation 4D A (%) | Reduction Area (%) | Hardness | Impact (J) |
| ASTM A193/A193M- 10a | B7 | ≤2 1/2" (M64) | ≥860 | ≥720 | ≥16 | ≥50 | ≤35HRC | …… |
| ＞2 1/2"-4" (M64-M100) | ≥795 | ≥655 | ≥16 | ≥50 | ≤35HRC | …… | ||
| ＞4"-7" (M100-M180) | ≥690 | ≥515 | ≥18 | ≥50 | ≤35HRC | …… | ||
| B7M | ≤4" (M100) | ≥690 | ≥550 | ≥18 | ≥50 | 93-99HRB | …… | |
| ＞4"-7" (M100-M180) | ≥690 | ≥515 | ≥18 | ≥50 | 93-99HRB | …… | ||
| B16 | ≤2 1/2" (M64) | ≥860 | ≥725 | ≥18 | ≥50 | ≤35HRC | …… | |
| ＞2 1/2"-4" (M64-M100) | ≥760 | ≥655 | ≥17 | ≥45 | ≤35HRC | …… | ||
| ＞4"-7" (M100-M180) | ≥690 | ≥586 | ≥16 | ≥45 | ≤35HRC | …… | ||
| ASTM A320/A320M- 10a | L7 | ≤2 1/2" (M64) | ≥860 | ≥725 | ≥16 | ≥50 | …… | -101ºC ≥27 |
| L43 | ≤4" (M100) | ≥860 | ≥725 | ≥16 | ≥50 | …… | -101ºC ≥27 | |
| L7M | ≤2 1/2" (M64) | ≥690 | ≥550 | ≥18 | ≥50 | 93-99HRB | -73ºC ≥27 | |
| L1 | ≤1" (M24) | ≥860 | ≥725 | ≥16 | ≥50 | …… | -73ºC ≥27 | |
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