Spring Steel Strip and Plate
Spring Steel Strip and Plate
1.Description
Spring Steel is typically used because of its’ high yield strengths, resistance to deformation and its ability to return to its original shape.
2.All Grades Comparison
| GB | ASTM | JIS | EN | DIN |
|---|---|---|---|---|
| 55 | 1055 | / | CK55 | 1.1204 |
| 60 | 1060 | / | CK60 | 1.1211 |
| 70 | 1070 | / | CK67 | 1.1231 |
| 75 | 1075 | / | CK75 | 1.1248 |
| 85 | 1086 | SUP3 | CK85 | 1.1269 |
| T10A | 1095 | SK4 | CK101 | 1.1274 |
| 65Mn | 1066 | / | / | / |
| 60Si2Mn | 9260 | SUP6,SUP7 | 61SiCr7 | 60SiCr7 |
| 50CrVA | 6150 | SUP10A | 51CrV4 | 1.8159 |
3.Quality Standard
DIN 17222 Cold Rolled Steel Strips for Springs Technical Conditions of Delivery
BS EN 10132 Cold rolled narrow steel strip for heat treatment. Technical delivery conditions
4.Chemical Composition(%)
| Steel Grade | C | Mn | Si | P | S | Cr | Ni | B | Cu | Mo | V |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 55 | 0.52-0.60 | 0.50-0.80 | 0.17-0.37 | 0.035 max | 0.035 max | 0.25 max | 0.30 max | / | 0.25 max | / | / |
| 65 | 0.62-0.70 | 0.50-0.80 | 0.17-0.37 | 0.035 max | 0.035 max | 0.25 max | 0.25 max | / | 0.25 max | / | / |
| 70 | 0.62-0.75 | 0.50-0.80 | 0.17-0.37 | 0.035 max | 0.035 max | 0.25 max | 0.25 max | / | 0.25 max | / | / |
| 75 | 0.72-0.80 | 0.50-0.80 | 0.17-0.37 | 0.035 max | 0.035 max | 0.25 max | 0.30 max | / | 0.25 max | / | / |
| 85 | 0.95-1.04 | 0.40 max | 0.35 max | 0.025 max | 0.025 max | / | / | / | / | / | / |
| 65Mn | 0.62-0.70 | 0.90-1.20 | 0.17-0.37 | 0.035 max | 0.035 max | 0.25 max | 0.25 max | / | 0.25 max | / | / |
| 60Si2Mn | 0.56-0.64 | 0.70-1.00 | 1.50-2.00 | 0.035 max | 0.035 max | 0.35 max | 0.25 max | / | 0.25 max | / | / |
| 50CrVA | 0.46-0.54 | 0.50-0.80 | 0.17-0.37 | 0.025 max | 0.025 max | 0.80-1.10 | 0.35 max | / | 0.25 max | / | 0.10-0.20 |
5.Mechanical Properties(Quenched and Tempered Condition)(T=20°C if not differently stated)
| Steel Grade | Tensile Strength Rm (Mpa) | Yield Strength Rp0.2 (Mpa) | Elongation A5 (%) | Area Reduction Ratio C (%) |
|---|---|---|---|---|
| 65 | 980 min | 785 min | 9 min | 35 min |
| 70 | 1030 min | 835 min | 8 min | 30 min |
| 85 | 1130 min | 980 min | 6 min | 30 min |
| 65Mn | 980 min | 785 min | 8 min | 30 min |
| 60Si2Mn | 1275 min | 1180 min | 5 min | 25 min |
| 50CrVA | 1275 min | 1130 min | 10 min | 40 min |
6.Delivery Conditions
Cold Rolled only
Cold Rolled+Soft Annealed (G)
Cold Rolled+Soft Annealed+Cold Rolled (G+K)
Cold Rolled+Hardened+Tempered (H+A)
7.Surface Conditions
Grey Blue (GR)
Bright (BK)
Polished (P)
Polished and Colour Tempered (P+AF)
8.Heat Treatment
| Steel Grade | Quenching Temperature (°C) ( | Media | Tempering Temperature (°C) |
|---|---|---|---|
| 65 | 840 | oil | 500 |
| 70 | 830 | oil | 480 |
| 85 | 820 | oil | 480 |
| 65Mn | 830 | oil | 540 |
| 60Si2Mn | 870 | oil | 480 |
| 50CrVA | 850 | oil | 500 |
9.Mill′s test certificate:
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
