High Speed Tool Steel M35 | 1.3243 | HS6-5-2-5 | SKH55

M35 steel is high speed tool steel . It also is called SKH55 steel and 1.3243 steel. After the heat treatment, its hardness, red hardness and wear resistance can be improved.
It is a good material for making tools which can handle high impact and abrasion. And it always is used to make advanced die, screw dies, reamer, milling cutter, iron head, punch, complex shape tools with high toughness. It is easy to do the hot and cold process. After the quenching and tempering, the hardness will be the same as M42 steel . And the hardness of them is 66±1HRC and 67±1 HRC.


What is Tool Steel M35 ?

ASTM A600 M35 steel is a medium-alloyed high speed tool steel. It is also known as HSSE or HSS-E which is similar to M2, but with 5% cobalt added, which makes better hot hardness and wear resistance. AISI /ASTM A600 M35 high speed steel is suitable for heat treatment up to 66 HRC, and also offers excellent cutting performance and offers excellent cutting performance. AISI high speed Tool Steel M35 is suitable for broaches, taps, milling, reamers, hobs, shapers cutters, saws ,etc.

HSS M35 is a conventionally manufactured cobalt alloyed high-speed steel. The various stages of the manufacturing process are chosen and controlled so that an end product is obtained with a good
structure in terms of carbide size and distribution. this is a distinct advantage for the finished tool.

High-Speed Steel M35 tool steel is characterised by

  • all-round applicability
  • good machine-ability
  • good performance
  • good hot hardness
  1. Supply Range of AISI High-Speed Steel Tool Steel M35

M35 Steel Round Bar:  diameter 2mm – 300mm

M35 Flat Bar: thickness 2-20mm x width 10-100mm

M35 Steel Plate: thickness 2-200mm x width 200-610mm

Surface Finish: Black, Rough Machined, Turned or as per given requirements.

  1. Relevant Steel Specification of AISI Tool Steel M35 High Speed
Country USA German Japan
Standard ASTM A600 DIN EN ISO 4957 JIS G4403
Grades M35 1.3243/HS6-5-2-5 SKH55
  1. AISI HSS Tool Steel M35 material Chemical Composition Compparison
ASTM A600 C Mn P S Si Cr V Mo W Co
M35 0.82 0.95 0.15 0.40 0.03 0.03 0.20 0.45 3.80 4.50 1.75 2.15 4.75 5.25 5.50 6.50 4.60 5.00
DIN ISO 4957 C Mn P S Si Cr V Mo W Co
1.3243/HS6-5-2-5 0.87 0.95 … 0.40 0.03 0.03 … 0.45 3.80 4.50 1.70 2.10 4.70 5.20 5.90 6.70 4.50 5.00
JIS G4403 C Mn P S Si Cr V Mo W Co
SKH55 0.87 0.95 … 0.40 0.03 0.03 … 0.45 3.80 4.50 1.70 2.10 4.70 5.20 5.90 6.70 4.50 5.00

4.Mechanical Properties of ASTM HSS Tool Steel M35

  • M35 HSS Physical Properties
Temperature °C / °F
20 / 70 400 / 750 600 / 1110
Density Kg/m³
Modulus of Elasticity kN/mm³²
34 · 10 6
31 · 10 6
27 · 10 6
Coefficient of Thermanl expansion from 20°C / 70°F per °C
per °F
– 11.6 · 10-6
6.4 · 10-6
11.9 · 10-6
6.6 · 10-6
Thermal Conductivity W/m °C
Btu/sq. ft. h °F/in.
Specific Heat J/kg °C
Btu/lb °F
  • H-SS Steel M35 Mechanical Properties
Mechanical properties Metric Imperial
Hardness, Rockwell C (oil quenched from 1232°C, 5 mins) 64.8 64.8
Hardness, Rockwell C (oil quenched from 1177°C, 5 mins) 65.2 65.2
Hardness, Rockwell C (oil quenched from 1204°C, 5 mins) 65.2 65.2
Modulus of elasticity 207 GPa 30000 ksi
Machinability (1% carbon steel) 45.0 – 50.0% 45.0 – 50.0%
  • M35 Steel Thermal Properties
Thermal properties Metric Imperial
CTE, linear (@21 – 399°C / 69.8 – 750°F) 11.4 μm/m°C 6.33 μin/in°F
CTE, linear (@21 – 593°C /69.8 – 1100°F) 11.5 μm/m°C 6.39 μin/in°F
  1. Forging of ASTM A600 High Speed Tool Steel M35

Pre heat the AISI M35 high speed steel slowly and uniformly to 450-500°C and equalise. Then increase M35 tool steel more quickly to the forging temperature of 950-1100°C and equalise prior to forging. Do not allow the forging temperature to drop below 950°C, if this occurs re heating will be necessary. Always cool the steel very slowly after forging.

  1. Machinability of AISI M35 Tool Steel

High Speed tool steel M35 can be worked in the same way as other high-speed steels by plastic forming, machining, grinding, electrical discharge machining, welding and polishing. M35 tool steel is amenable to cold forming. In grinding, local heating of the surface, which might alter the temper, must be avoided. Grinding wheel makers can furnish advice on the choice of grinding wheels. Machining is carried out using carbide or high-speed steel tools.

  1. Heat Treatment of AISI Tool Steel M35 High Speed Material
  • Soft-annealing 850°C – 900°C / 1560°F – 1650°F, slow cooling 10°C / 18°F/h to 700°C / 1290°F, hardness max 260 Brinell.
  • Stress relieving 600°C – 700°C / 1120°F – 1290°F, approx. 2 hours at temperature, slow cooling to 500°C / 930°F.
  • Hardening with preheating in two steps 450°C – 500°C / 840°F – 930°F, 850°C – 900°C / 1560°F – 1650°F and austenitizing at 1050°C – 1220°C / 1920°F – 2230°F. Quenching to about 550°C / 1022°F then cool in air to hand warm
  • Tempering at 560°C / 1040°F or higher 2 times for at least 1 hour at full temperature is recommended.
  1. Application for AISI Tool Steel M35 High Speed Steel

AISI HSS M35 tool steel is usually used in conditions with the demand for high hardness. M35 steel is suitable for cutting tools such as cutting tools including broaches, milling cutters, reamers, end mills and saw blades. It is also a good quality wear resistant HSS grade for cold work area. Steel M35 is also suitable for cold work applications, where exacting demands are imposed on wear resistance. The steel possesses an admirable combination of wear resistance and toughness and in these respects superior to the high alloyed cold work steels.

We are M35 tool steel high speed supplier with decades history. We supply reliable M35 steel materials products as well as technical support of other High Speed Steel like M2, M42 steels. Contact us for any demand of high speed M35 steels.

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