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| MOQ | 2 tons |
| Port | Nanchang, Shenzhen, Shanghai, Ningbo, Xiamen |
| Lead Time | 30 days |
| Steel grade | 51CrV4, 50CrV4, SK4, SK5, C100S, C50 ,C60 ,C75, 65MN |
Cold rolled spring steel strip 51CrV4, 50CrV4, SK4, SK5, C100S, C50 ,C60 ,C75, 65MN
1,Delivery Conditions:
| Delivery Condition | Sizes | Surface | Edge |
| 1.Cold Rolled | 1.Thickness: 0.09-8mm | Bright / Polished / Blue/Yellow | Slit |
| 2.Cold Rolled+Hydrogen Annealed | 2.Width: 6-450mm | Round | |
| 3.Cold Rolled+Hardened+Tempered | Coil insider diameter: 300-800mm | Square |
2, Grades comparision:
| GRADES COMPARISON FOR SPRING STEEL | ||||||||
| CHINA GB/T | USA ASTM | JAPAN JIS | GERMANY DIN | FRANCE NF | BIRTAIN BS | ISO | KOREA KS | TAIWAN CNS |
| 45 | 1045 | S45C | CK45 | XC45 | C45 | |||
| 50 | 1050 | S50C | CK50 | XC50 | 080M50 | C50 | ||
| 60 | 1060 | S60C | CK60 | XC60 | 060A62 | C60 | ||
| 70 | 1070 | S70C | CK70 | XS70 | S70 | |||
| 75 | 1075 | S75C | CK75 | XC75 | C75 | |||
| T10 | W1-9 | SK4 | ||||||
| T9 | W1-8 | SK5 | ||||||
| SK85 | --- | SK85 | ||||||
| 40Mn | 1043 | SWRH42B | 40Mn4 | 40M5 | 080A40 | SL,SM | ||
| 42Mn | ||||||||
| 65Mn | 1566 | S60C-CSP | CK67 | 080A67 | C60E4 | |||
| 55Si2Mn | 9255 | SUP 6 /SUP7 | 55Si7 | 55Si7 | 251H60 | 55SiCr7 | ||
| 60Si2Mn | 9260 | SUP 6 / SUP7 | 65Si7 | 65Si7 | 251H60 | 61SiCr7 | SUP3 | SUP6 |
| 62Si2Mn | ||||||||
| 75Cr1 | 75Cr1 | 75Cr1 | 75Cr1 | |||||
| 51CrV4 | 5160 | SUP9A | 51CrV4 | 51CrV4 | SPS5A | SUP9A | ||
| 30CrMo | G41300 | SUP13 | 35CrMo4 | SPS9 | SUP13 | |||
| 50CrVA | 6150 | SUP10 | 51CrV4 | 51CrV4 | 735A51 | 51CrV4 | SPS6 | SUP10 |
3,Chemical Composition:
| Standard | Grade | Chemical Composition（%） | ||||||||
| C | Si | Mn | P | S | Cr | Ni | Cu | V | ||
| GB/T699 | 45 | 0.42～0.50 | 0.17～0.37 | 0.50～0.80 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T699 | 50 | 0.47～0.55 | 0.17～0.37 | 0.50～0.80 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T699 | 55 | 0.52～0.60 | 0.17～0.37 | 0.50～0.80 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T699 | 60 | 0.57～0.65 | 0.17～0.37 | 0.50～0.80 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T699 | 65 | 0.62～0.70 | 0.17～0.37 | 0.50～0.80 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T699 | 70 | 0.67～0.75 | 0.17～0.37 | 0.50～0.80 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T699 | 75 | 0.72～0.80 | 0.17～0.37 | 0.50～0.80 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T699 | Mn40 | 0.37～0.44 | 0.17～0.37 | 0.70～1.00 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T699 | Mn45 | 0.42～0.50 | 0.17～0.37 | 0.70～1.00 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T699 | Mn65 | 0.62～0.70 | 0.17～0.37 | 0.90～1.20 | 0.035 | 0.035 | 0.25 | 0.3 | 0.25 | |
| GB/T1298 | SK85/SK5 | 0.80 ~0.90 | ≤0.35 | ≤0.50 | 0.03 | 0.03 | 0.2 | 0.25 | 0.3 | |
| GB/T1298 | SK4 | 0.95～1.04 | ≤0.35 | ≤0.40 | 0.035 | 0.03 | 0.25 | 0.2 | 0.3 | |
| GB/T3077 | 51CrV4 | 0.47～0.55 | 0.17～0.37 | 0.80～1.10 | 0.035 | 0.035 | 0.90～1.20 | 0.3 | 0.3 | 0.10～0.20 |
| GB/T3077 | 50CrVA | 0.47～0.54 | 0.17～0.37 | 0.50～0.80 | 0.025 | 0.025 | 0.80～1.10 | 0.3 | 0.3 | 0.10～0.20 |
| GB/T3077 | 75Cr1 | 0.7～0.8 | 0.25～0.5 | 0.50～0.70 | 0.035 | 0.035 | 0.30～0.40 | |||
| GB/T1222 | 55Si2Mn | 0.52～0.60 | 1.50～2.00 | 0.60～0.90 | ≤0.035 | ≤0.035 | ≤0.35 | ≤0.35 | ≤0.25 | |
| GB/T1222 | 60si2Mn | 0.56～0.64 | 1.50～2.00 | 0.60～0.90 | ≤0.035 | ≤0.035 | ≤0.35 | ≤0.35 | ≤0.25 | |
4, Our Tolerances:
| THICKNESS TOLERNACES | |||||||
| Nominal Thickness (mm) | W < 125 | 125 <= W | |||||
| A | B | C | A | B | C | ||
| 0,15~0,25 | TS EN | ±0,015 | ±0,012 | ±0,008 | ±0,020 | ±0,015 | ±0,010 |
| YONGLI STEEL | ±0,008 | ±0,010 | |||||
| 0,25~0,40 | TS EN | ±0,020 | ±0,015 | ±0,010 | ±0,025 | ±0,020 | ±0,012 |
| YONGLI STEEL | ±0,010 | ±0,012 | |||||
| 0,40~0,60 | TS EN | ±0,025 | ±0,020 | ±0,012 | ±0,030 | ±0,025 | ±0,015 |
| YONGLI STEEL | ±0,015 | ±0,015 | |||||
| 0,60~1,00 | TS EN | ±0,030 | ±0,025 | ±0,015 | ±0,035 | ±0,030 | ±0,020 |
| YONGLI STEEL | ±0,015 | ±0,020 | |||||
| 1,00~1,50 | TS EN | ±0,035 | ±0,030 | ±0,020 | ±0,040 | ±0,035 | ±0,025 |
| YONGLI STEEL | ±0,020 | ± 0,025 | |||||
| 1,50~2,50 | TS EN | ±0,040 | ±0,035 | ±0,025 | ±0,050 | ±0,040 | ±0,030 |
| YONGLI STEEL | ±0,025 | ±0,030 | |||||
| 2,50~4,00 | TS EN | ±0,050 | ±0,040 | ±0,030 | ±0,060 | ±0,050 | ±0,035 |
| YONGLI STEEL | ±0,030 | ±0,035 | |||||
| Please contact us if you have any special requirements. | |||||||
| WIDTH TOLERANCES FOR SLIT EDGE (GK) | |||||||
| Width Tolerances TS EN 10140 | Production Width (mm) | ||||||
| Nominal Thickness (mm) | W < 125 | 125 <= W <= 250 | 250 < W | ||||
| A | B | A | B | A | B | ||
| 0,2 ~ 0,6 | TS EN | ± 0,15 | ± 0,10 | ± 0,20 | ± 0,13 | ± 0,25 | ± 0,18 |
| YONGLI STEEL | ± 0,10 | ± 0,13 | ± 0,18 | ||||
| 0,6 ~ 1,5 | TS EN | ± 0,20 | ± 0,13 | ± 0,25 | ± 0,18 | ± 0,30 | ± 0,20 |
| YONGLI STEEL | ± 0,13 | ± 0,18 | ± 0,20 | ||||
| 1,5 ~ 2,5 | TS EN | ± 0,25 | ± 0,18 | ± 0,30 | ± 0,20 | ± 0,35 | ± 0,25 |
| YONGLI STEEL | ± 0,18 | ± 0,20 | ± 0,25 | ||||
| 2,5 ~ 4,0 | TS EN | ± 0,30 | ± 0,20 | ± 0,35 | ± 0,25 | ± 0,40 | ± 0,30 |
| YONGLI STEEL | ± 0,20 | ± 0,25 | ± 0,30 | ||||
5, Applications:
| Product standard | Applications | S50C(CK50/1050) | - Measuring tape | |
| 65Si2Mn | - Springs | - Structural parts of cameras | ||
| 50CrV4 | - Springs | - Chain parts | ||
| 51CrV4 | - Springs | - Springs | ||
| SK4 (1095) | - Measuring tape | - Clutch parts | ||
| - Razor blades | - Washers | |||
| - Pen points | - Safety buckles | |||
| - Wind-up springs | S55C(CK55/1050) | - Springs | ||
| - Springs | - Safety shoes | |||
| - Cutlery | - Can openers | |||
| - Knitting needles | - Thompson blades | |||
| SK5 (1085) | - Measuring tape | - Structural parts of cameras | ||
| - Gauges | S60C(CK60/1060) | - Chain parts | ||
| - Springs | - Hand saws for woodworking | |||
| - Cutlery | - Safety shoes | |||
| - Knitting needles | - Springs | |||
| - Band saws for woodworking | - Office equipment parts | |||
| and lumbering | - Washers | |||
| - Round saws | S65C(65MN/CK67) | - Safety shoes | ||
| - Office equipment parts | - Clutch parts | |||
 S45C(CK45/1045)
|
- Clutch parts | - Springs | ||
| - Chain parts | - Washers | |||
| - Retainers | S75C(CK75/1075) | - Clutch parts | ||
| - Washers | - Springs | |||
| S50C(CK50/1050) | - Measuring tape | - Band saws | ||
| - Structural parts of cameras |
6, Our Mill:
-Cold rolling mill 2HI, 4HI, 6HI-- 7 sets
-Annlealing Furnace Hydrogen and Nitrogen-36 sets
-EBNER lead quenching lines-2 sets ， Water quenching lines-10 sets
-Slitting machines-8 sets
-Pinch pass mill : 6 sets
-Our warehouse
355 Ankang Road, Yuanhe Economic Development Zone, Yushui District, Xinyu City, Jiangxi Province of China
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