60S2, 60S2A, 65Si7, 1.5028, 60Si7, 1.5027 - spring steel according to PN H-84032, GOST 14959-79
Table of content:
| Standard | Grade | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical composition % | |||||||||||||||
| C: | Si; | Mn: | P: | S: | Cr: | Ni: | Cu | ||||||||
| PN | 60S2 | ||||||||||||||
| 0,57-0,65 | 1,5-1,8 | 0,6-0,9 | <0,04 | <0,04 | <0,03 | <0,04 | <0,25 | ||||||||
| PN | 60S2A | ||||||||||||||
| 0,57-0,63 | 1,6-2,0 | 0,6-0,9 | <0,03 | <0,03 | <0,03 | <0,40 | <0,25 | ||||||||
| DIN | 65Si7 / 1.5028 | ||||||||||||||
| 0,6-0,7 | 1,5-1,8 | 0,7-1,0 | <0,035 | <0,035 | - | - | - | ||||||||
| EN | 60Si7 / 1.5027 | ||||||||||||||
| 0,57-0,64 | 1,5-2,0 | 0,6-0,9 | <0,04 | <0,04 | - | - | - | ||||||||
| NF | 61SC7 | ||||||||||||||
| 0,57-0,64 | 1,6-2,0 | 0,6-0,9 | <0,035 | <0,035 | - | - | - | ||||||||
| UNI | 60Si7 | ||||||||||||||
| 0,57-0,64 | 1,5-2,0 | 0,6-0,9 | <0,035 | <0,035 | - | - | - | ||||||||
| AISI | 9260 | ||||||||||||||
| 0,55-0,65 | 1,7-2,2 | 0,65-1,10 | <0,035 | <0,040 | - | - | - | ||||||||
| GOST | 60S2 | ||||||||||||||
| 0,57-0,65 | 1,5-2,0 | 0,6-0,9 | <0,035 | <0,035 | <0,03 | <0,25 | <0,2 | ||||||||
| JIS | SUP6 | ||||||||||||||
| 0,56-0,64 | 1,5-1,8 | 0,7-1,0 | <0,03 | <0,03 | - | - | <0,3 | ||||||||
| GB/T | 60Si2Mn | ||||||||||||||
| 0,56-0,64 | 1,5-2,0 | 0,7-1,0 | <0,035 | <0,035 | <0,35 | <0,35 | <0,25 | ||||||||
| GB/T | 60Si2MnA | ||||||||||||||
| 0,56-0,64 | 1,6-2,0 | 0,6-0,9 | <0,03 | <0,03 | <0,35 | <0,35 | <0,25 | ||||||||
60S2, 60S2A, 65Si7, 1.5028, 60Si7, 1.5027 – description
Spring steel for hardening in oil with low hardenability, sensitive to decarburisation, insensitive to tempering brittleness.
The steel is used for springing parts, like springs and springs for trams, narrow-gauge railways, motor and transport vehicles subjected to medium loads, flat springs, spiral springs, car springs over 8mm thick, disc springs, torsional shafts. It is recommended that the thickness of a rod made from the steel does not exceed 20mm.
Steel 60S2A is characterized by better strength properties than 60S2.
60S2 - Mechanical and Physical Properties
Physical properties in ambient temperature:
- Density: 7,68 g/cm3
- Specific heat capacity: 0,46 kJ/(kg*K)
- Linear expansion coefficient: 11,0 K-1
- Thermal conductivity: 18,84 W/(m*K)
- Electrical resistivity: 0,360 Ω*cm
- Young's modulus E: 21,0 kG/mm2
- Shear modulus G: 8,0 kG/mm2
Mechanical properties of 60S2 steel:
- Bars:
- Diameter cone impression: > 3,5 mm
- Hardness annealed: 269 HB
- Hardness raw cond.: 302 HB
- Percent reduction of area Z: > 25 %
- Elongation A: > 6 %
- Tensile strength Rm: > 1270 MPa
- Yield strength Re: > 1175 MPa
- Screw cylindrical springs:
- Generally:
- Hardness: 41,5-48,5 HRC
- Hardness: 375-444 HB
- Cushioning units:
- Hardness: 41,5-50,5 HRC
- Generally:
- Helical springs:
- Generally:
- Hardness: 40,0-46,5 HRC
- Hardness: 375-444 HB
- Spring hardening:
- Hardness: 42-49 HRC
- Generally:
Mechanical properties of 60S2A steel:
- Bars:
- Hot-rolled or hot-forget and drawn:
- Yield strength Re: > 1375 MPa
- Tensile strength Rm: > 1570 MPa
- Elongation A: > 6 %
- Percent reduction of area Z: > 20 %
- Hardness - raw cond.: 302 HB
- Hardness - annealed cond.: 269 HB
- Diameter cone impression: > 3,5 mm
- Hot-rolled or hot-forget and drawn:
- Screw cylindrical springs:
- Generally:
- Hardness: 41,5-48,5 HRC
- Hardness: 375-444 HB
- Cushioning units:
- Hardness: 41,5-50,5 HRC
- Generally:
- Helical springs:
- Generally:
- Hardness: 40,0-46,5 HRC
- Hardness: 375-444 HB
- Spring hardening:
- Hardness: 42-49 HRC
- Generally:
- A clamp of spring rod for mounting rails:
- Hardness: 42,0-50,5 HRC
- Spring coldrolled strip:
- Cold-rolled - Thickness: 0,1-4,0 mm - Tensile strength Rm: 780-1180 MPa
- Annealed - Thickness: 0,1-4,0 mm
- Elongation A: > 8 %
- Tensile strength Rm: < 880 MPa
Heat treatment and working
Recommended working and heat treatment parameters for 60S2 alloy:
- Forging: 1180-800 °C
- Rolling: 1180-850 °C
- Quenching: 860-880 °C / o,w
- Tempering: 440-480 °C
- Normalizing annealing: 840-860 °C
- Soft annealing: 640-680 °C
Recommended cooling methods for plastic forming:
Hot rolling, where the charge is a raw ingot, cold or hot, depending on the thickness of the rolled product:
- up to 50mm - free cooling in air.
- 51-150mm - free cooling in a stack or in a pit - open, or covered and unheated with a thermostat set on 100°C.
- 151-200mm - cooling in a covered and unheated pit with a thermostat set on to 100°C.
- above 200mm - dehydrogenation
Hot rolling, where the charge is cold billet or slab, rolled or forged, depending on the thickness of the rolled product:
- up to 100mm - free cooling in air.
- 101-150mm - free cooling in a stack or in a pit - open, or covered and unheated with a thermostat set on 100°C.
- 151-200mm - cooling in a covered and unheated pit with a thermostat set on to 100°C.
Hot forging, where the charge is a raw ingot, cold or hot, depending on the forged product thickness:
- up to 50mm - free cooling in air.
- 51-200mm - cooling in insulating material or in the unheated, covered pit, in both cases up to approx. 100°C.
- over 200mm - anti-flash annealing
Hot forging, where the charge is cold-rolled billet or slab, depending on the thickness of the forged product:
- up to 100mm - free cooling in air.
- 101-300mm - cooling in insulating material or in the unheated, covered pit, in both cases up to approx. 100°C.
- over 300mm - cooling with the furnace or in the covered pit, heated to 100°C.
We deliver this steel alloy as:
Replacements, equivalents and other designations:
60S2, 60S2-Sh, 60S2-VD, 60S2G, 60Si2Mn, 60Si2MnA, 60Si7, 61SC7, 65S7, 71S7, 65Si7, 71Si7, 60Si7, SUP6, SUP7, 60S2A, SPS3, SPS4, 9260, H92600, C2332