GB 65Mn Steel Coil, AISI 1066, ASTM 1566

65Mn steel coil is a spring steel with high strength, certain toughness and plasticity, good hardness and good wear resistance. And 65Mn steel is very good for making knives, and can also be used as various flat and round springs, cushion springs, spring springs, etc. in small sizes. AISI 1066 / ASTM 1566 / GB 65Mn steel coil composition and more information as below.

GB 65Mn Steel Coil Sheet Plate Supply Range
Coil/Sheet/PlateThickness:0.1mm to 1000mm or can be customized;
Width: 10mm to 1000mm or can be customized;
Length: Can be customized;
We can supply any lenth based on the customer's requirement.

65Mn Steel Coil Grade Equivalent Chart

Grades 65Mn10661566080A6765Г

GB 65Mn Steel Coil Chemical Composition

GradeC (%)Fe (%)Mn(%)P(%)S (%)
GB 65Mn/ AISI 1066/ ASTM 15660.60 - 0.71 % 98.05 - 98.55 % 0.85 - 1.15 % ≤0.040 %≤0.050 %

ASTM 1566 Steel Coil Physical Properties

Physical PropertiesMetricImperial
Density 7.85 g/cc0.284 lb/in³

1566 Steel Coil Mechanical Properties

Mechanical Properties
Poissons Ratio (Typical For Steel)0.27-0.30
Elastic Modulus (GPa)190-210
Tensile Strength (Mpa)1158
Yield Strength (Mpa)1034
Elongation (%)15
Reduction in Area (%)53
Hardness (HB)335

65Mn Steel Coil Application

1. Used for springs with small size, such as pressure-adjusting and speed-regulating springs, force-measuring springs, square coil springs or drawn steel wires as springs on small machinery.

2. It can produce spring rings, valve springs, clutch reeds, brake springs and cold-drawn steel wire coil springs.

3. The main material for making diamond circular saw blades

4. High wear-resistant parts, such as grinding machine spindles, spring chucks, precision machine tool screws, cutters, collars on spiral roller bearings, railway rails, etc.

65Mn Steel Round Bar Coil Sheet Plate Heat Treatment

Heat Treatment Specifications
Quenching 830°C±20°C, oil cooling; Tempering 540°C±50°C (±30°C for special needs).

65Mn Spring Steel Annealed
In the traditional annealing process, first slowly heat to 730 ºC and allow enough time to allow the steel to be fully heated, keep it warm for 13 hours, and then cool the furnace to 650 ºC, then leave the furnace and air cool. Then 65Mn tool steel will get MAX 250 HB (Brinell hardness).

New annealing process: annealing temperature (860±10)°C, heat preservation for 45-60min, furnace cooling to (750±10)°C, heat preservation for 3-3.5h, after furnace cooling to 650-660°C, heat preservation The pit is slowly cooling. The metallographic structure meets the requirements: the pearlite structure is 2.5-6 grades, preferably around 4 grades, and the process improves the efficiency by 80%-100%.

Quenching of GB 65Mn Steel
65Mn steel should be started by heating uniformly to 830-860°C (1526-1580°F) until fully heated. After approximately 30 minutes per 25 mm of scribed section, the steel should be quenched in oil immediately.

Tempering of 65Mn Steel
65Mn steel is tempered at 540°C by soaking at the selected temperature for a minimum of 1 hour per 25mm of total thickness. Hardness values at different temperatures after tempering.

65Mn Steel Coil Supply

The elastic deformation capacity of our spring steel within the specified range allows it to withstand a certain load without permanent deformation after the load is removed. We are a professional supplier of various steel coils. We produce high-quality 65Mn steel coils according to international standards and provide a wide range of solutions. Welcome to contact us.

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