Hot Sale High-carbon Spring Steel Wire Product Standard GB/T4357-2008
chemical composition
| grade | c% | si% | mn% | s% | p% |
| 65Mn | 0.62-0.70 | 0.17-0.37 | 0.90-1.20 | <0.035 | <0.035 |
| 70 | 0.62-0.75 | 0.17-0.37 | 0.50-0.80 | <0.035 | <0.035 |
| 72B | 0.69-0.76 | 0.15-0.35 | 0.60-0.90 | <0.025 | <0.025 |
| 82B | 0.72-0.86 | 0.15-0.35 | 0.60-0.90 | <0.025 | <0.025 |
Mechanical properties
| Diameter/mm | Tensile strength/Mpa | Roundness tolerance | Diameter tolerance | ||
| Grade B | Grade C | Grade D | |||
| 3.00 | 1370-1670 | 1570-1860 | 1710-1960 | Less than half of H11 grade | accord with provsion for h11 in the GB/T342 table |
| 3.20-3.50 | 1320-1620 | 1570-1810 | 1660-1910 | ||
| 4.00-4.50 | 1320-1620 | 1520-1760 | 1620-1860 | ||
| 5.00-5.50 | 1320-1570 | 1470-1710 | 1570-1810 | ||
| 6.00 | 1220-1470 | 1420-1660 | 1520-1760 | ||
| 6.30 | 1220-1470 | 1420-1610 | |||
| 7.00-8.0 | 1170-1420 | 1370-1570 | |||
| 9.00-10.0 | 1130-1320 | 1320-1520 | |||
| 11.0-12.0 | 1080-1270 | 1270-1470 | |||
| 13.0 | 1030-1220 | 1220-1420 | |||
| 14.0-18.0 | According to technical agreement | ||||
| packaging form | inner dia. | External dia. | kg/coil |
| coil | 650-850 | 1000-1200 | 200-2200kg/coil |

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