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CNC Machining
Mild Steel 1045 is a medium-carbon steel that offers noticeably higher strength and impact resistance than low-carbon grades, while remaining practical to machine and weld. Through our UK CNC machining service, Mild Steel 1045 CNC parts can be produced as one-off prototypes or repeat batches.
In the normalised or hot-rolled condition it responds well to tapping, milling, drilling, turning and broaching when suitable speeds, feeds and tooling are used. Typical uses include gears, pins & shafts, axles, bolts & studs and wear-resistant industrial parts. Its quoted tensile strength of around 680 MPa gives a useful guide when sizing parts.
Parts are CNC milled or turned and supplied with an as-machined finish. As the steel has little natural corrosion protection, a coating, plating or oil finish is advisable. Upload your CAD file for a quick quote on CNC machining Mild Steel 1045, with delivery anywhere in the UK.
Material
Mild Steel 1045
Description
Strengths
Lead time 10 business days. Strong, impact-resistant medium-carbon steel that machines and welds well when normalised or hot rolled.
Weaknesses
Rusts easily; not suited to nitriding
Silver grey
Ultimate tensile strength
680 MPa
Yield strength
580 MPa
Modulus of elasticity
200 GPa
Elongation at break
18%
Density
7.87 g/cm³
Hardness
84 HRB
Shear modulus
80 GPa
Corrosion resistance
Low
UK equivalent
EN8 (080M40)
Maximum service temperature
Not specified
Thermal expansion coefficient
11.2–12 × 10⁻⁶ /°C
Thermal conductivity
Not specified
Electrical resistivity
Not specified
Heat treatment
Normalised / hot rolled
Recommended finish
Coating, plating or oil
Gears, pins & shafts
Axles, bolts & studs
Wear-resistant industrial parts
High-strength machine parts
Values shown are typical supplier figures for Mild Steel 1045 and may vary with stock condition. Please confirm critical properties before production.
1045 (EN8) is a medium-carbon steel that machines well in the normalised or hot-rolled condition. It is harder than 1018, so cycle times can be slightly longer.
1045 is a good choice for shafts, pins and other turned parts with precise diameters. Achievable tolerances depend on part size, geometry and features, so mark any critical tolerances on a 2D drawing with your upload and they will be reviewed and confirmed in your quote.
1045 rusts easily, so a protective coating, plating or oil is recommended. It can be supplied normalised or hot rolled; it is not suited to nitriding.
Typical uses include gears, pins and shafts, axles, bolts and studs, wear-resistant industrial parts and high-strength machine parts.
1045 is an economical medium-carbon steel for moderately loaded parts. 4140 (EN19) is a chromium-molybdenum alloy steel with higher fatigue and torsional strength, so choose it for heavily loaded shafts and gears.
The typical lead time shown for 1045 steel is 10 business days from an approved order. Quantity, finishing and any heat treatment can affect this, and your quote confirms the date before you order.
Parts in as fast as 10 business days
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