China EN10132 Standard SAE1075 cold rolled carbon steel strip CK75 C75 C75S Spring steel strip Manufacturer and Supplier | Ruiyi
EN10132 Standard SAE1075 cold rolled carbon steel strip CK75 C75 C75S Spring steel strip has a carbon content of 0.7-0.8% making it a multi-purpose carbon steel with good spring properties. Therefore, it is a commonly used carbon steel in a wide range of engineering applications.
SAE1075 or CK75 contains 0.7-0.8% carbon, 0.15-0.35% silicon, 0.6-0.9% manganese, and 0.03% phosphorus and sulphur. It has a tensile strength of 1230-1340 MPa, yield strength of 1130-1240 MPa, and a hardness of 57-63 HRC.
CK75 spring steel has better hardenability, the critical hardenable diameter in oil can reach 100~150mm. CK75 or C75 is Suitable for making very large springs, such as stacked leaf springs on bulldozers, large coil springs and large torsion springs on ships.
CK75 spring steel is a high-carbon steel material. Its chemical composition mainly includes carbon (C) content between 0.70-0.80%, silicon (Si) content between 0.10-0.35%, and manganese (Mn) content between 0.60-0.80%. Between 0.90%, the contents of phosphorus (P) and sulfur (S) are less than 0.025% respectively. CK75 spring steel has good elasticity and toughness and is often used to manufacture springs, blades, saw blades, knives and other parts and tools that require high strength and wear resistance.
C75 C75s CK75 SAE 1075 spring steel strip
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 |
| Top Metal STEEL | ±0,008 | ±0,010 | |||||
| 0,25~0,40 | TS EN | ±0,020 | ±0,015 | ±0,010 | ±0,025 | ±0,020 | ±0,012 |
| Top Metal STEEL | ±0,010 | ±0,012 | |||||
| 0,40~0,60 | TS EN | ±0,025 | ±0,020 | ±0,012 | ±0,030 | ±0,025 | ±0,015 |
| Top Metal STEEL | ±0,015 | ±0,015 | |||||
| 0,60~1,00 | TS EN | ±0,030 | ±0,025 | ±0,015 | ±0,035 | ±0,030 | ±0,020 |
| Top Metal STEEL | ±0,015 | ±0,020 | |||||
| 1,00~1,50 | TS EN | ±0,035 | ±0,030 | ±0,020 | ±0,040 | ±0,035 | ±0,025 |
| Top Metal STEEL | ±0,020 | ± 0,025 | |||||
| 1,50~2,50 | TS EN | ±0,040 | ±0,035 | ±0,025 | ±0,050 | ±0,040 | ±0,030 |
| Top Metal STEEL | ±0,025 | ±0,030 | |||||
| 2,50~4,00 | TS EN | ±0,050 | ±0,040 | ±0,030 | ±0,060 | ±0,050 | ±0,035 |
| Top Metal 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 |
| TOP METAL 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 |
| TOP METAL 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 |
| TOP METAL 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 |
| TOP METAL 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 |
