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Condition | Material Grade | T.S (MPa) lowest | Y.S (MPa) lowest | Elongation (%) |
BKS | ST35 (10#) | ≥420 | ≥315 | ≥14 |
BKS | ST45(20#) | ≥520 | ≥375 | ≥12 |
BKS | ST52(16Mn) | ≥580 | ≥420 | ≥10 |
GBK | ST35 (10#) | ≥315 | ≥35 | |
GBK | ST45(20#) | ≥390 | ≥32 | |
GBK | ST52(16Mn) | ≥490 | ≥30 | |
NBK | ST35 (10#) | 340-470 | ≥235 | ≥32 |
NBK | ST45(20#) | 440-570 | ≥255 | ≥30 |
NBK | ST52(16Mn) | 490-630 | ≥335 | ≥28 |
ID size | ID deviation (mm) | ||||||
HONED/SRB TUBE | H7 | H8 | H9 | H10 | |||
30 | +0.021 0 | +0.033 0 | +0.052 0 | +0.084 0 | |||
>30~50 | +0.025 0 | +0.039 0 | +0.062 0 | +0.100 0 | |||
>50~80 | +0.030 0 | +0.046 0 | +0.074 0 | +0.120 0 | |||
>80~120 | +0.035 0 | +0.054 0 | +0.087 0 | +0.140 0 | |||
>120~180 | +0.040 0 | +0.063 0 | +0.100 0 | +0.160 0 | |||
>180~250 | +0.046 0 | +0.072 0 | +0.115 0 | +0.185 0 | |||
>250~315 | +0.052 0 | +0.081 0 | +0.130 0 | +0.210 0 | |||
>315~400 | +0.0527 0 | +0.089 0 | +0.140 0 | +0.230 0 | |||

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