Chemical Composition of M35 Steel:

Element	Content (%)
Carbon (C)	0.93
Chromium (Cr)	4.2
Cobalt (Co)	4.9
Iron (Fe)	76.52
Molybdenum (Mo)	5.0
Silicon (Si)	0.3
Tungsten (W)	6.25
Vanadium (V)	1.9

Mechanical Properties of M35 Steel:

Property	Metric	Imperial
Yield Strength (Rpo2)	419 MPa	60,792 psi
Tensile Strength (Rm)	481 MPa	69,739 psi
Elongation (A)	12%	12%
Reduction of Area (Z)	34%	34%
Brinell Hardness	260 HBW	260 HBW

Hardness of M35 Steel:

Condition	Metric	Imperial
Rockwell C (oil quenched at 1232°C, 5 min)	64.8	64.8
Rockwell C (oil quenched at 1177°C, 5 min)	65.2	65.2
Rockwell C (oil quenched at 1204°C, 5 min)	65.2	65.2

M35 Heat Treatment:

The heat treatment of M35 involves controlled heating, cooling, and soaking times based on the component’s size and shape. The hardening temperature for M35 is typically between 1050°C and 1250°C, depending on the type of work being treated. Vacuum or controlled furnaces are recommended for optimal results, with a preheat at 450-500°C and a final heat to 820-870°C.

M35 Hardening:

To achieve the best results, harden M35 in a vacuum or controlled furnace, or in a rectified salt bath. Preheat thoroughly in two stages: first to 450-500°C, then to 820-870°C before quenching in oil.

M35 Tempering:

Tempering is done between 510°C and 620°C. Triple tempering is recommended, with a minimum of two hours per cycle at the specified temperature. The component should cool to room temperature between tempering cycles.

Tempering Temperature (°C)	Hardness (HRc)
540°C	67
560°C	66
580°C	65

Physical Properties of M35 Steel:

Property	Metric	Imperial
Density	8.14 g/cm³	0.294 lb/in³

Thermal Properties of M35 Steel:

Property	Metric	Imperial
CTE, linear (21–399°C)	11.4 μm/m°C	6.33 μin/in°F
CTE, linear (21–593°C)	11.5 μm/m°C	6.39 μin/in°F

M35 Forging:

M35 steel should be preheated slowly to 450-500°C before raising the temperature more rapidly to the forging range of 950-1100°C. Equalize before forging and ensure the temperature doesn’t fall below 950°C during the process. Cooling must be slow after forging.

M35 Stress Relieving:

To relieve machining stresses, heat M35 steel to 600-700°C and soak for approximately two hours. Cool slowly in the furnace before performing the final heat treatment.

M35 Normalizing:

M35 is supplied in an annealed condition. Re-annealing is necessary only if the steel has been hot worked, forged, or hardened. Heat to 850°C at a rate no greater than 220°C per hour and allow it to cool slowly in the furnace.

M35 Annealing:

Anneal M35 by heating to 850°C, holding for one hour per 25mm of thickness, with two hours being the minimum. Cool slowly in the furnace. The hardness after annealing should be no more than 260 Brinell.

Machinability of M35 Steel:

M35 can be worked using conventional methods like plastic forming, machining, grinding, electrical discharge machining (EDM), welding, and polishing. Machining is typically carried out using carbide or high-speed steel tools, and grinding must be done carefully to avoid altering the temper of the steel.

Welding of M35 Steel:

Welding M35 requires special procedures, including preheating and filler materials that match the base material composition to avoid cracking.

Titan Steel & Engineers Related Products:

Carbon Steel, Alloy Steel, Bright Steel, Spring Steel, Die Steel & Tool Steel, Special Alloy Steel

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