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CNC Machining
Spring Steel 65Mn is a manganese-alloyed, medium-to-high carbon steel with a very high yield strength, widely used in automotive and industrial suspension. For UK engineers and product designers, CNC machining Spring Steel 65Mn is a reliable route from prototype to finished part.
This allows parts to withstand significant bending or twisting and spring back to their original shape. Common examples are springs & automotive parts, saw blades & scrapers and lock picks. Its quoted tensile strength of around 980 MPa gives a useful guide when sizing parts. Our team can advise whether Spring Steel 65Mn is the right fit for your design, or suggest an alternative.
Parts are CNC milled or turned. In the hardened and tempered condition it performs particularly well for flat springs that are difficult to form. Get an instant online quote for Spring Steel 65Mn CNC parts and have them delivered to your door in the UK.
Material
Spring Steel 65Mn
Description
Strengths
Lead time 10 business days. Very high yield strength lets parts flex or twist and spring back to shape.
Weaknesses
Rusts easily without a finish
Silver grey
Ultimate tensile strength
980 MPa
Yield strength
785 MPa
Modulus of elasticity
207 GPa
Elongation at break
14%
Density
7.8 g/cm³
Hardness
30–50 HRC
Shear strength
1140 MPa
Magnetism
Magnetic
UK equivalent
Maximum service temperature
Not specified
Thermal expansion coefficient
10.4–12.4 × 10⁻⁶ /°C
Thermal conductivity
22–29 W/(m·°C)
Electrical resistivity
Not specified
Heat treatment
Hardening & tempering
Recommended finish
Coating, plating or oil
Springs & automotive parts
Saw blades & scrapers
Lock picks
Antennas
Values shown are typical supplier figures for Spring Steel 65Mn and may vary with stock condition. Please confirm critical properties before production.
65Mn is a high-carbon manganese steel with a very high yield strength once hardened and tempered, so parts can flex or twist and spring back to shape.
It is best machined before hardening. Heat treatment is then used to reach spring properties, so please state the hardness you need on your drawing.
Heat treatment after machining can cause slight movement, so critical dimensions should be flagged for review. 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.
65Mn rusts easily without a finish, so a coating, plating or oil is recommended.
Typical uses include springs and automotive parts, saw blades and scrapers, clips and antennas. For general machined parts without spring requirements, 1045 or 4140 steel is usually more suitable.
The typical lead time shown for 65Mn spring steel is 10 business days from an approved order. Heat treatment can add time. 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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