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High Resistance High Speed Steel M35

?M35 tool steel is similar to M2 high speed steel,but with 5% cobalt added, so AISI M35 also well known by HSS-E.High speed steel M35 generally used in making taps,drill bits,tool bits,etc....

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M35 tool steel is similar to M2 high speed steel,but with 5% cobalt added, so AISI M35 also well known by HSS-E。High speed steel M35 generally used in making taps,drill bits,tool bits,etc。


FEATURES: M35 is similar to M2, but with 5% cobalt added. The addition of cobalt increases heat resistance.M35 high speed steel is suitable for heat treatment up to 66 HRC, and also offers excellent cutting performance and offers excellent cutting performance.M35 is also known as HSSE or HSS-E.


APPLICATIONS: Twist drills, taps, milling cutters, reamers, broaches, saws, and knives.


COMPOSITION

C

Mn

Si

Cr

W

Mo

V

Co

0.91

0.35

0。32

4。10

6.30

4.98

1。95

4。80


SIMILAR BRAND

GB

JIS

DIN

ISO

W6Mo5Cr4V2Co5

SKH55

1.3243

HS6-5-2-5


METALLURGY METHOD:

NON-VACUUM FURNACE + LF FURNACE + ESR

Temper

(℃)

Density (g/cm3)

Elastic Modulus (KN/mm2)

Thermal expansion coefficient (20℃)

Heat transfer coefficient(W/m℃)

Specific heat

(J/Kg℃))

20

8.19

228

21

400

400

8。11

210

1.19x10-6

26

490

600

8.05

195

1.21x10-6

23

530


PHYSICAL PROPERTYS:

MECHANICAL PROPERTYS:

Tool Bits

Broach

Gear cutter

Pinch

Taps,Saw

Grain Size

9-10

10-11

10-11

10-11

10-11

Hardened Hardness (HRC)

65-66

66-67

66-67

66-67

66-67


HEAT TREATMENT INSTRUCTIONS:

Preheating: To minimize distortion and stresses in large or complex tools use a double preheat. Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1100°F (593°C) equalize, then heat to 1450-1550°F (788-843°C). For normal tools, use only the second temperature range as a single preheating treatment.


Austenitizing (High Heat): Heat rapidly from the preheat.
For Cutting Tools:
Furnace: 2200-2250°F (1204-1232°C)
Salt: 2203-2254°F (1210-1240°C)
To maximize toughness, use the lowest temperature.
To maximize hot hardness, use the highest temperature.


Quenching: Pressurized gas, warm oil, or salt. For pressurized gas, a rapid quench rate to below 1000°F (538°C) is critical to obtain the desired properties. For oil, quench until black, about 900°F (482°C), then cool in still air to 150 -125°F (66-51°C). For salt maintained at 1000-1100°F (538-593°C), equalize, then cool in still air to 150 -125°F (66-51°C).


Tempering: Temper immediately after quenching. Typical tempering range is 1025-1050°F (552-566°C). Hold at temperature for 2 hours, then air cool to ambient temperature. Double tempering is required. For large cross sections, and especially for blanks from which tools will be cut by wire EDM, triple tempering is strongly recommended.


ANNEALING

Annealing must be performed after hot working and before re-hardening。 Delivery condition with hardness less than 269HB。


STANDARD SIZE & SURFACE CONDITION

Round Bar: Diameter 1.5mm to 200mm

Flat Bar: Width ≤ 120mm

Plate: Width ≤ 1000mm, length ≤ 2000mm

Surface Condition: Black or Polished Bright (h9)


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