Structural steel 45

Steel 45

High-quality carbon structural steel

Steel 40X, steel 50, steel 50G2

China ML45, EU(EN) 1.1191, C45, C45E.

Pinion shafts, crankshafts, camshafts, gears, pinions, spindles, bands, cylinders, cams and other normalised, improved and surface heat-treated parts from which increased strength is required.

Classification, nomenclature and general standards: GOST 1050-2013 Forgings: GOST 8479-70, GOST 1133-71 Sheets and strips: GOST 19903-74, GOST 1571-81 The material is supplied in the form of strips, sheets and blocks. We produce rectangular and other shaped parts from forgings or strips according to customers' requests.

Mass fraction of elements not more than, %: Carbon (C) 0,42-0,50; Silicon (Si) 0,17-0,37; Manganese (Mn) 0,5-0,8; Chromium (Cr) up to 0,25; Nickel (Ni) up to 0,3; Copper (Cu) up to 0,25; Phosphorus (P) up to 0,035; Sulphur (S) up to 0,04.

steel 45, 45

Forging temperature: beginning 1250°С, end 700°С. Sections up to 400 mm are cooled in air. Machinability by cutting: in hot-rolled condition at NV 170-179, σv = 640 MPa Kν tv.spl. = 1, Kν b.st. = 1. Weldability: hard weldable. Welding methods: RDS and CTS. Heating and subsequent heat treatment are necessary. Flock sensitivity: insensitive. Tendency to temper brittleness: not tendentious.

To improve mechanical properties, steel is subjected to hardening heat treatment depending on the required hardness (143 to 229 NV).

Heating to a temperature of 820-850°C, holding, cooling in water, heating to a temperature depending on the required hardness (200°C to 700°C), cooling in air.

Delivery condition: up to 197 NV Hardening (tempering): 15-54 HRC

Heating to a temperature of 810-840°C, holding, after which steel 45 is cooled at a slow rate from +150°C to +200°C until its temperature equals the temperature in the working range of +500°C to +550°C.