65G, 65Mn4, 66Mn4, 1.1240, 1.1260 - Manganese spring alloy structural steel according to PN-74/H-84032
| Standard | Steel Grade | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Al: | Cu: | |
| PN | 65G | ||||||||
| 0.6 - 0.7 | 0.90 - 1.20 | 0.15 - 0.40 | <0.04 | <0.04 | <0.3 | <0.3 | - | <0.25 | |
| DIN | 66Mn4 - 66 Mn 4 - 1.1260 | ||||||||
| 0.60 - 0.71 | 0.85 - 1.15 | 0.15 - 0.30 | <0.035 | <0.035 | - | - | - | - | |
| DIN | 65Mn4 - 65 Mn 4 - 1.1240 | ||||||||
| 0.60 - 0.70 | 0.90 - 1.20 | 0.25 - 0.50 | <0.035 | <0.035 | - | - | - | - | |
| ISO | 56Mn4 - 56 Mn 4 - 1.1233 | ||||||||
| 0.52 - 0.60 | 0.90 - 1.20 | <0.40 | <0.025 | <0.03 | - | - | <0.05 | <0.3 | |
| GOST | 65G - 65Г | ||||||||
| 0.62 - 0.70 | 0.90 - 1.20 | 0.17 - 0.37 | <0.035 | <0.035 | <0.25 | <0.25 | - | - | |
| GOST | 65GA - 65ГА | ||||||||
| 0.65 - 0.70 | 0.7 - 1.0 | 0.15 - 0.30 | <0.025 | <0.025 | <0.15 | <0.2 | <0.08 | <0.2 | |
| STAS | 65MN10 - 65 Mn 10 | ||||||||
| 0.62 - 0.70 | 0.90 - 1.20 | 0.17 - 0.37 | <0.035 | <0.035 | <0.3 | <0.3 | - | <0.3 | |
| ČSN / STN | ČSN 13 180 - ČSN 13180 | ||||||||
| 0.70 - 0.80 | 0.90 - 1.20 | 0.15 - 0.35 | <0.035 | <0.04 | <0.3 | <0.4 | - | <0.3 | |
| SAE | AISI C1062 - 1062 | ||||||||
| 0.54 - 0.65 | 0.85 - 1.15 | - | <0.04 | <0.05 | - | - | - | - | |
| UNS | AISI 1066 - AISI 1566 | ||||||||
| 0.60 - 0.71 | 0.85 - 1.15 | - | <0.04 | <0.05 | - | - | - | - | |
65G steel - specification and application
65G - Steel for leaf springs and springs with low hardenability requiring increased resistance to abrasion for rings, valve springs, flat, coils and spring washers with small cross-sections and loads. Steel for hardening in oil insensitive to temper brittleness. Steel does not show resistance to corrosive environments.
Mechanical and physical properties of 65G steel
- Tensile strength, Rm ≥ 980 MPa
- The yield strength, Re ≥ 780 MPa
- Contraction, Z ≥ 30%
- Elongation, A ≥ 8%
- Hardness after softening ≤ 241 HB
- Hardness in raw condition: ≤ 262 HB
- Hardness after hardening and tempering in a temp. of 380-520℃ = 42 - 47 HRC
- Hardness after hardening and tempering in 400 - 550 ℃ = 310 - 350 HB
- Density ρ = ~ 7,83 kg / dm3
- Thermal conductivity λ20 ℃ = ~ 46,2 W ⋅ m-1 K-1
- Thermal capacity cp20-100 ℃ = ~ 481 J ⋅ kg-1 K-1
- Linear expansion coefficient α20-100℃ = ~11,35 10-6 K-1
In the described grade, the company provides:
- Hot-rolled and cold-rolled sheets 65G
- Forged and rolled bars 65G
- Cold-rolled strips 65G
- Forgings 65G
- Forged bars 65G
- Wires in 65G or an equivalent
The list of equivalents and other designations of 65G steel:
66Mn4, 66 Mn 4, 1.1260, 65Mn4, 65 Mn 4, 1.1240, 56Mn4, 56 Mn 4, 1.1233, 65Г, 65GA, 65ГА, 65MN10, 65 Mn 10, ČSN 13 180, ČSN 13180, AISI C1062, 1062, AISI 1066, AISI 1566