Cold Drawn Spring Steel Wire and Rod
Cold Drawn Spring Steel Wire and Rod
1.Description
Spring steel is a low alloy, medium carbon steel with a very high yield strength. This allows objects made of spring steel to return to their original shape after significant bending or twisting.
2.Application
Used for manufacture of front and rear suspension coil springs, stabilisers, various types of coil and leaf springs and a wide variety of machine parts and mechanisms
3.Size Ranges
Diameter: 0.10mm-30mm
4.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 |
| 55SiCrA | 9254 | SUP12 | 54SiCr6 | 1.7102 |
| 9255 | / | 55Si7 | 1.5026 | |
| 60Si2CrA | / | / | 60MnSiCr4 | 1.2826 |
5.Quality Standard
JIS G4801 2005 Spring Steels
BS EN 10089 2002 Hot rolled steels for quenched and tempered springs
ASTM A29 Standard Specification Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements
6.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 |
| 55SiCrA | 0.51-0.59 | 0.50-0.80 | 1.20-1.60 | 0.025 max | 0.025 max | 0.50-0.80 | 0.35 max | / | 0.25 max | / | / |
| 60Si2CrA | 0.56-0.64 | 0.40-0.70 | 1.40-1.80 | 0.025 max | 0.025 max | 0.70-1.00 | 0.35 max | / | 0.25 max | / | / |
7.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 |
| 55SiCrA | 1450-1750 | 1300 min | 6 min | 25 min |
| 60Si2CrA | 1765 min | 1570 min | 6 min | 20 min |
8.Delivery Conditions
Cold Drawn only
Cold Drawn+Soft Annealed
Cold Drawn+Hardened+Tempered
9.Surface Conditions
Smooth
Peeled
Polished
Blasted
10.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 |
| 55SiCrA | 860 | oil | 450 |
| 60Si2CrA | 870 | oil | 420 |
11.Mill′s test certificate:
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
