65Mn ASTM 1065 Spring Steel Strip Manufacturer RAYIWELL
65Mn spring steel strip is a high-carbon steel alloy known for its high strength, hardness, and elasticity, making it ideal for springs and other components that require flexibility and durability.
It is a widely used material for various flat and coil springs, clips, and is also used in applications like blades and stamps.
65Mn Spring Steel Strip is known for its flexibility, which helps prevent the blade from breaking upon impact. Cost-Effective: It is often more affordable than other types of steel, making it a popular choice for functional, entry-level swords and blades.
65Mn High carbon Spring steel strip, after heat treatment and cold drawing hardening, high strength, it has a certain toughness and plasticity; In the same surface hardening case, completely and a fatigue limit and alloy spring.
But hardenability is poor, mainly for the smaller size of the spring, such as regulating speed, regulating spring, spring load, general machinery in the round, square spiral spring or pull wire for small mechanical spring
The main application of High Carbon Spring Steel Strip
| 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 |
Spring steel application
GB 65Mn Steel is a high quality Alloy Spring Steel, and it belong to the high quality high carbon alloy Spring Steel.Its Quenched & Tempered Hardness is 28-34 HRC. 65Mn steel under Annealing delivery hardness less than 250HB.
65Mn Spring Steel steel Strip is a Chinese GB standard spring steel grade, Manganese (Mn) improves hardenability, so the strength, hardness, elasticity and hardenability are higher than that of 65# steel, but it has overheat sensitivity and temper brittleness.
Water quenching tends to form cracks. The annealed state has good machinability, low cold deformation plasticity, and poor weldability.
65Mn high carbon Spring steel strip is mainly used in the manufacture of various small-section flat springs, round springs, clockwork, etc.
It can also be used to manufacture spring rings, valve springs, shock absorbers, clutch reeds and brake springs.
65Mn Spring Steel Strip Datasheet
Below is material AISI 65Mn spring steel datasheet including chemical composition, properties and heat treatment, etc.
Chemical Composition
The table below lists 65Mn high carbon Spring steel Strip chemical composition based on heat analysis.
| Chemical Composition, % | |||||||||
| Standard | Grade | C | Si | Mn | P, ≤ | S, ≤ | Cr, ≤ | Ni, ≤ | Cu, ≤ |
| GB/T 1222 | 65Mn | 0.62-0.70 | 0.17-0.37 | 0.90-1.20 | 0.030 | 0.030 | 0.25 | 0.35 | 0.25 |
65Mn Spring Steel Material Properties
Density: 7.85 g/cm3
| Mechanical Properties of Spring Steel Strip | ||||||
| Standard | Grade | Tensile Strength, MPa, ≥ | Yield Strength, MPa, ≥ | Elongation, %, ≥ | Reduction in Area, %, ≥ | Brinell Hardness, HBW, ≤ |
| GB/T 1222 | 65Mn | 980 | 785 | 8.0 | 30 | 302 |
Notes: Bars with a diameter and side length of not more than 80 mm and flat steels with a thickness of not more than 40 mm.
| Tensile strength | Conditions to yield strength | Elongation | Reduction of area | Hardness (Hot Rolled) | Hardness (Cold Drawn) |
| σb (MPa)：≥980 | σ0.2 (MPa)：≥785 | δ 5 (%)：≥8 | ψ (%)：≥30 | ≤302HB; |
Heat Treatment Specification
| Heat Treatment | ||||
| Standard | Grade | Quenching temperature, °C | Quenching medium | Tempering temperature, °C |
| GB/T 1222 | 65Mn | 830 ± 20 | Oil | 540 ± 20 |
Annealing process: Annealing temperature (860 ± 10) °C, heat preservation for 45-60min, furnace cooling to (750 ± 10) °C, heat preservation for 3-3.5h, and furnace cooling to 650-660 °C, then cooling out of the furnace or slow cooling in a heat preservation pit.
Delivery Condition of 65Mn Spring Steel Strip
| 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 |
65Mn Spring steel strip surface
Heat treatment Related
Annealing of 65Mn Spring Steel
At first Slowly heated to 730 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. Then 65Mn tool steel will get MAX 250 HB （Brinell hardness）.
Hardening of 65Mn Spring Steel
At the beginning, 65Mn steels should be heated uniformly to 830-860°C (1526-1580°F) until completely heated through.
After about 30 min per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in oil. Tempering of 65Mn Spring Steel
Tempering of 65Mn steels is performed at 540°C, Soak well at the selected temperature and soak for at least one hour per 25mm of total thickness. Hardness values at different temperatures after tempering.
65Mn Spring Steel Strip Equivalent
65Mn Spring steel Strip is considered to be equivalent to steel strip AISI SAE 1065, and some people also compare 65Mn with AISI/SAE 1075, 1095, 5160; JIS SK5 (SK85) and Chinese 8Cr13Mov, so the table below lists the difference of chemical composition for your reference.
65Mn vs 1065, 1075, 1095, 5160, SK5 and 8Cr13Mov in chemical composition
| Chemical Composition % | ||||||||||
| Grade | C | Si | Mn | P (≤) | S (≤) | Cr | Ni (≤) | Cu (≤) | Mo | V |
| 65Mn | 0.62-0.70 | 0.17-0.37 | 0.90-1.20 | 0.030 | 0.030 | ≤ 0.25 | 0.35 | 0.25 | – | – |
| 1065 | 0.60-0.70 | 0.60-0.90 | 0.040 | 0.050 | – | – | (0.20) | – | – | |
| 1075 | 0.70-0.80 | 0.40-0.70 | 0.040 | 0.050 | – | – | (0.20) | – | – | |
| 1095 | 0.90-1.03 | 0.30-0.50 | 0.040 | 0.050 | – | – | (0.20) | – | – | |
| 5160 | 0.56-0.61 | 0.15-0.35 | 0.75-1.00 | 0.035 | 0.040 | 0.70-0.90 | – | (0.30) | – | – |
| SK5 | 0.80-0.90 | 0.10-0.35 | 0.10-0.50 | 0.030 | 0.030 | 0.30 | 0.25 | 0.25 | – | – |
| 8Cr13Mov | 0.70-0.80 | 1.00 | 1.00 | 0.040 | 0.030 | 13.00-14.50 | 0.60 | 0.10-0.30 | 0.10-0.25 | |
Steel Strip Grades comparision between Each Country
|
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 | ||
| 67 | 1067 | S67C |
CK67 |
XS67 | S67 | |||
| 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 |
| D6A | ||||||||
| X32 | X32CrMoV4-1 | |||||||
3, Chemical Composition:
| Grade (EN) | Grade (ASTM) | Chemical Composition（%） | |||||||||
| C | Si | Mn | P | S | Cr | Ni | Cu | V | Mo | ||
| C45S | 1045 | 0.42～0.50 | 0.17～0.37 | 0.50～0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | ||
| C50S | 1050 | 0.47～0.55 | 0.17～0.37 | 0.50～0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | ||
| C55S | 1055 | 0.52～0.60 | 0.17～0.37 | 0.50～0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | ||
| C60S | 1060 | 0.57～0.65 | 0.17～0.37 | 0.50～0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | ||
| C67S | 1067 | 0.62～0.70 | 0.17～0.37 | 0.50～0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | ||
| C70S | 1070 | 0.67～0.75 | 0.17～0.37 | 0.50～0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | ||
| C75S | 1075 | 0.72～0.80 | 0.17～0.37 | 0.50～0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | ||
| C100 | 1095 | 0.95～1.04 | ≤0.35 | ≤0.40 | ≤0.035 | ≤0.03 | ≤0.25 | ≤0.2 | ≤0.3 | ||
| 65Mn | 65Mn | 0.62～0.70 | 0.17～0.37 | 0.90～1.20 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.3 | ≤0.25 | ||
| SK85/SK5 | SK85/SK5 | 0.80 ~0.90 | ≤0.35 | ≤0.50 | ≤0.03 | ≤0.03 | ≤0.2 | ≤0.25 | ≤0.3 | ||
| SK4 | SK95 | 0.95～1.04 | ≤0.35 | ≤0.40 | ≤0.035 | ≤0.03 | ≤0.25 | ≤0.2 | ≤0.3 | ||
| 51CrV4 | 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 | |
| 75Cr1 | 75Cr1 | 0.7～0.8 | 0.25～0.5 | 0.50～0.70 | ≤0.035 | ≤0.035 | 0.30～0.40 | ||||
| 55Si2Mn | 55Si2Mn | 0.52～0.60 | 1.50～2.00 | 0.60～0.90 | ≤0.035 | ≤0.035 | ≤0.35 | ≤0.35 | ≤0.25 | ||
| 60si2Mn | 60si2Mn | 0.56～0.64 | 1.50～2.00 | 0.60～0.90 | ≤0.035 | ≤0.035 | ≤0.35 | ≤0.35 | ≤0.25 | ||
| D6A | D6A | 0.42～0.55 | 0.10～0.30 | 0.60～0.90 | ≤0.025 | ≤0.015 | 0.90～1.20 | 0.40～0.70 | 0.05～0.25 | 0.85～1.10 | |
4, Our Tolerances:
| THICKNESS TOLERNACES | ||||||
| Nominal Thickness (mm) | W < 125 | 125 <= W | ||||
| A | B | C | A | B | C | |
| 0,15~0,25 | ±0,015 | ±0,012 | ±0,008 | ±0,020 | ±0,015 | ±0,010 |
| ±0,008 | ±0,010 | |||||
| 0,25~0,40 | ±0,020 | ±0,015 | ±0,010 | ±0,025 | ±0,020 | ±0,012 |
| ±0,010 | ±0,012 | |||||
| 0,40~0,60 | ±0,025 | ±0,020 | ±0,012 | ±0,030 | ±0,025 | ±0,015 |
| ±0,015 | ±0,015 | |||||
| 0,60~1,00 | ±0,030 | ±0,025 | ±0,015 | ±0,035 | ±0,030 | ±0,020 |
| ±0,015 | ±0,020 | |||||
| 1,00~1,50 | ±0,035 | ±0,030 | ±0,020 | ±0,040 | ±0,035 | ±0,025 |
| ±0,020 | ± 0,025 | |||||
| 1,50~2,50 | ±0,040 | ±0,035 | ±0,025 | ±0,050 | ±0,040 | ±0,030 |
| ±0,025 | ±0,030 | |||||
| 2,50~4,00 | ±0,050 | ±0,040 | ±0,030 | ±0,060 | ±0,050 | ±0,035 |
| ±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 | ± 0,15 | ± 0,10 | ± 0,20 | ± 0,13 | ± 0,25 | ± 0,18 |
| ± 0,10 | ± 0,13 | ± 0,18 | ||||
| 0,6 ~ 1,5 | ± 0,20 | ± 0,13 | ± 0,25 | ± 0,18 | ± 0,30 | ± 0,20 |
| ± 0,13 | ± 0,18 | ± 0,20 | ||||
| 1,5 ~ 2,5 | ± 0,25 | ± 0,18 | ± 0,30 | ± 0,20 | ± 0,35 | ± 0,25 |
| ± 0,18 | ± 0,20 | ± 0,25 | ||||
| 2,5 ~ 4,0 | ± 0,30 | ± 0,20 | ± 0,35 | ± 0,25 | ± 0,40 | ± 0,30 |
| ± 0,20 | ± 0,25 | ± 0,30 | ||||
