45 steel is among the most highly sought and popular types of structural carbon steel. It conforms to the GOST 1050-2013 and DSTU 7809 standards
Classification: High-grade structural carbon steel.
Product:Rolled products, including shaped.
Chemical composition of 45 steel, according DSTU 7809%
| | Si | Mn | P | Ni | Cr | S | Cu | As | Fe |
| | 0.17-0.37 | 0.5-0.8 | <0.035 | <0.25 | <0.25 | <0.04 | <0.25 | <0.08 | ~97 |
Mechanical properties of 45 steel after normalization
| Standard | Delivery condition | Creep limit, Rm (MPa) | Short-term tensile strength ReH (MPa) | Minimum elongation ratio σ, % | Contraction ratio, % |
| GOST 1050 | Post-normalisation | 355 | 600 | 16 | 40 |
| DSTU 7809 | Post-normalisation | 355 | 600 | 16 | 40 |
Analogues to 45 steel
| US | 1044, 1045, 1045H, G10420, G10430, G10440, G10450, M1044 |
| Germany | 1.0503, 1.1191, 1.1193, C45, C45E, C45R, Cf45, Ck45, Cm45, Cq45 |
| Japan | S45C, S48C, SWRCH45K, SWRCH48K |
| France | 1C45, 2C45, AF65, C40E, C45, C45E, C45RR, CC45, XC42H1, XC42H1TS, XC45, XC45H1, XC48, XC48H1 |
| UK | 060A47, 080M, 080M46, 1449-50CS, 1449-50HS, 50HS, C45, C45E |
| EU | 1.1191, 2C45, C45, C45E, C45EC, C46 |
| Italy | 1C45, C43, C45, C45E, C45R, C46 |
| Belgium | C45-1, C45-2, C46 |
| Spain | C45, C45E, C45k, C48k, F.114, F.1140, F.1142 |
| China | 45, 45H, ML45, SM45, ZG310-570, ZGD345-570 |
| Sweden | 1650, 1672 |
| Bulgaria | 45, C45, C45E |
| Hungary | A3, C45E |
| Poland | 45 |
| Romania | OLC45, OLC45q, OLC45X |
| Czech Republic | 12050, 12056 |
| Australia | 1045, HK1042, K1042 |
| Austria | C45SW |
| South Korea | SM45C, SM48C |
Application
45 steel is used in hot- and cold-rolled flat and rolled products and forgings that then go on to be used in metal structures and machine-building components of various shapes and sizes. 45 structural steel has a wide range of uses in spindles, advancing cams, gear wheels, fastenings and various axle types. This steel is used for vital components (cantilever constructions, shafts, bars, beams, plungers, etc.) which are heat-treated to increase their strength.
Welding
45 steel is difficult to weld. To achieve a high-quality welded seam, the product must be heated to +200-300°С before welding, then heat-treated (annealed) afterwards.
