Structural alloy steel 37MnSi5, 1.5122, 38MS5 designed for thermal improvement and surface hardening according to PN-89/H-84030-04.
| Standards | Steel Grades | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | Ti: | Cu: | ||
| PN | 35SG | ||||||||||
| 0.31 - 0.39 | 1.1 - 1.4 | 1.1 - 1.4 | <0.035 | <0.035 | <0.25 | <0.30 | - | - | <0.30 | ||
| AFNOR | 38MS5 - 38 MS 5 | ||||||||||
| 0.35 - 0.43 | 1.0 - 1.4 | 1.1 - 1.4 | <0.040 | <0.035 | - | - | - | - | - | ||
| DIN | 37 MnSi 5 - 37MnSi5 - 1.5122 - 5122 | ||||||||||
| 0.33 - 0.41 | 1.1 - 1.4 | 1.1 - 1.4 | <0.035 | <0.035 | - | - | - | - | - | ||
| STAS | 35MnSi13 - 35 MnSi 13 - 35MnSi12 - 35 MnSi 12 | ||||||||||
| 0.31 - 0.39 | 1.1 - 1.4 | 1.1 - 1.4 | <0.035 | <0.035 | <0.25 | <0.30 | <0.15 | <0.02 | <0.30 | ||
| GB/T | 35SiMn - A10352 | ||||||||||
| 0.32 - 0.40 | 1.1 - 1.4 | 1.1 - 1.4 | <0.035 | <0.035 | <0.30 | <0.30 | <0.15 | - | <0.30 | ||
35SG - specification and applications
35SG is a structural steel with medium hardenability, good ductility and very good durability, which is designed for thermal improvement in oil, water or surface hardening. Due to the increased content of manganese, steel has a much better abrasion resistance than other low alloy structural steels.
Materials of this particular grade achieve the best strengths at the dimensions of 30-40mm in cross-section, and due to the possibility of surface hardening they can safely substitute some of the carburizing species. 35SG material is one of the species that unfortunately has a tendency to have a coarse-grained structure and temper brittleness. To prevent temper brittleness, steel is hardened in water or oil.
In the heat-treated state, 35SG is used to produce small parts for medium-duty vehicles. In the case of surface hardening, it is used for shafts and smaller rollers. Products with the aforementioned chemical composition are not suitable for welding, but in situations where welding is required, the steel must be heated to a suitable temperature prior to welding.
The 35SG grade is used in the manufacture of medium-duty components in the machine industry such as generators, high speed gear units, gear wheels, turbine shafts, bushings, vehicle axles, rings, gear wheels, disc rotors, crankcases, pins, heavy-duty nuts and bolts, levers, crank shafts, joysticks, controls, rollers or piston rods.
General mechanical properties
- Tensile strength Rm > 880 MPa
- Yield point, Re > 690 MPa
- Notch toughness, KU2 > 48 J
- Contraction, Z > 40%
- Elongation, A > 15%
- Hardness in softened state < 220 HB
- Surface hardness after thermo-chemical treatment: 53 HRC
- Hardness in normalized state 179 - 217 HB
Steel heat treatment - process, temperature, cooling
- Slow softening annealing at 680 - 720 ℃
- Normalizing in 840 - 860℃ in air
- Hardening in oil or water at 870 - 890℃
- Tempering at 530 - 670℃
In the above mentioned grades the company provides:
- Hot-rolled bars 35SG, 37MnSi5, 1.5122
- Forgings 35SG, 37MnSi5, 1.5122
- Forged rings 35SG, 37MnSi5, 1.5122
- Flat bars 35SG, 37MnSi5, 1.5122
The list of grades with similar chemical composition and 35SG steel equivalents:
SZ1, SZ 1, 38MS5, 38 MS 5, 37MnSi5, 37 MnSi 5, 1.5122, 5122, 35SiMn, ZG35Mn, ZG35SiMn, ZG35SIMnMo, CSN 13240, CSN 13 240, G 37 MnSi 5, G37MnSi5, 35MnSi13, 35 MnSi 13, 35MnSi12, 35 MnSi 12, F-130.A, 1.5124 .