M35 steel | AISI M35 |1.3243 |SKH55

M35 steel is an internationally used super-hard high-speed steel containing cobalt with high wear resistance, high pressure resistance and sintering resistance.

M35 cobalt-containing high-speed steel is inexpensive and easy to process, through appropriate heat treatment, high hardness (HRC67-70), high red hardness (625 ℃ for 4 hours, HRC63-65) and high wear resistance, toughness and flexural strength are not less than ordinary high-speed steel, can overcome early damage such as die edge collapse and chipping.

M35 steel is also called HSSE or HSS-E.It is similar with M2,but add more 5% cobalt which will increase hot hardness.M35 has good machinability,toughness,hardness,wear resistance and cutting ability. By virtue of these well balanced properties,M35 has come into very wide use for cutting tools.

M35 steel Supply Form & Size & Tolerance

Round bar
Diameter	1-16mm	10-50mm	50-180mm	180-300mm
Process	Cold Drawn	Hot Rolled	Hot Forged	Free Forging
Flat bar
Thickness	1-2.5mm	1.5-20mm	20-300mm
Width	Max 800mm	Max 800mm	Max 800mm
Process	Cold Drawn	Hot Rolled	Hot Forged

Remark:Tolerance can be customized as per requests

M35 steel Chemical Composition

Standard	Grade	C	Mn	P	S	Si	Cr	V	Mo	W	Co
ASTM A600	M35	0.80-0.85	0.2-0.4	0.03	0.03	0.2-0.4	3.9-4.4	1.75-2.15	4.75-5.25	6.15-6.65	4.75-5.25
DIN EN ISO 4957	1.3243	0.88-0.96	0.4	0.03	0.03	0.45	3.8-4.5	1.70-2.00	4.70-5.20	6.00-6.70	4.50-5.00
JIS G4403	SKH55	0.87-0.95	0.4	0.03	0.03	0.45	3.8-4.5	1.70-2.10	4.70-5.20	5.90-6.70	4.50-5.00

M35 steel Physical Property

	Temperature °C
	20	400	600
Density,g/cm³	8.15	8.05	7.99
Modulus of Elasticity,kN/mm²	230	205	184
Coefficient of Thermanl expansion from 20°C,10^-6	_	11.6	11.9
Thermal Conductivity,W/m °C	24	28	27
Specific Heat,J/kg °C	420	510	600
Machinability (1% carbon steel)	45.0 – 50.0%
CTE, linear,21 – 399°C, μm/m°C	11.4		–
CTE, linear,21 – 593°C, μm/m°C	11.5

M35 steel Quenching Hardness

Hardness, Rockwell C (oil quenched from 1177°C, 5 mins)	65.2HRC
Hardness, Rockwell C (oil quenched from 1204°C, 5 mins)	65.2HRC
Hardness, Rockwell C (oil quenched from 1232°C, 5 mins)	64.8HRC

M35 steel Forging

Pre heat the AISI M35 with two steps.First,heat slowly and uniformly to 450-500°C with a rate not exceeding 220°C per hour,second,heat more quickly to the forging temperature of 950-1150°C.Re-heating is necessary when temperature below 950°C. Slow cooling in furnace after forging.

M35 steel Annealing

Annealing must be performed after hot working ,forging, or before re-hardening.Heat the temperature to 850to 900°C with a rate not exceeding 220°C per hour(one hour per 25mm of total thickness).Controlled slow cooling in furnace at 10 to 20°C per hour to approximately 600°C, followed by cooling in still air. The M35 annealed hardness achieved should be 260 Brinell or lower.

M35 steel Stress Relieving

It is recommended to stress relieve after machining and prior to hardening to minimise the possibility of distortion.Heat in a neutral atmosphere to the temperature of 600 to 700°C, and soak for approximately two hours,followed by slow cooling in the furnace.

M35 steel Hardening

Preheat M35 with two steps ,first step with 450-500°C, holding 20~30 minutes per 25 mm. Second step with 850-900°C,then to the appropriate hardening temperature 1050°C – 1220°C.

Quenchant: By oil(40~60℃) , air or hot bath .

M35 steel Tempering

Tempering should be carried out immediately after quenching. Triple tempering is recommended for M35,heat slowly and uniformly to the tempering temperature 510-620°C,soak well not less than 2 hours per cycle(one hour per 25mm of total thickness). The minimum hardness is 64HRC.

Temperature,°C	540	560	580
Hardness,HRC	67	66	65

M35 steel Guidelines for Hardening&Tempering

Typical Application	M35
Typical Application	Hardening	Tempering(twice)
Single- edge cutting tools, tool bits, form tools, etc	1220°C	560°C
Rotating multi-edge cutting tools, twist drills, saws, milling cutters broaches, taps, etc.	1180°C – 1220°C	560°C – 580°C
Tools for cold work applications, punching, blanking, forming, cold extrusion, etc.	1050°C – 1150°C	560°C – 590°C

M35 steel Applications

M35 steel is suitable for the manufacture of strong cutting with wear-resistant, impact-resistant various tools, advanced punching dies, screw dies, more toughness and complex shape tools, reamers, milling cutters, iron heads, punches, etc. The main uses are hobs, broaches, end mills.

Buying Guide for M35 Steel

While the market is filled with a ton of M35 steel suppliers and manufacturers, it’s still difficult to land on the perfect company to help you with what you need.

So, if you’re on the hunt for the best M35 steel supplier, we’re here to help you! This buying guide is dedicated to providing you all the information and the knowledge you need about M35 steel.

In today’s guide, we will be discussing to you everything you need to know about M35 steel. By the end of the buying guide, you’ll already know what to purchase, and more especially, who you’ll be purchasing from!

What is M35 Steel?

In a nutshell, M35 steel is a type of super hard high speed steel (HSS) that contains cobalt.

Image of M35 steels stacked up against each other

Thanks to its composition, it’s a type of steel resistant to wear, high pressure, as well as sintering.

We will get into further detail a bit later, but now, let’s look at some of the most questions about M35 steel.

Is M35 Steel Easy to Process?

Akin to other types of HSS, M35 steel is a simple type of metal to process. It’s also inexpensive and can be found from many different sources and suppliers from all across the globe.

Even if it’s easy-to-process, you will also be able to find some of its properties effective. We’ll be discussing more about this in the latter part of this guide.

How Is M35 Steel Characterized?

Samples image of M35 cobalt being prepared for distribution

M35 high speed steel is characterized and is recognized through the following:

Good level of hot hardness (temperature resistance)
All-around material – applicable to a wide array of applications
Good levels of machinability
Overall, good levels of performance

Supply Ranges of M35 High Speed Steel

If you’re looking for the different ways on how you can purchase M35 steel, you can purchase them in the following dimensions and forms:

Flat bar – [DIAMETER] 2mm to 300 mm
Steel plate – [THICKNESS] 2 to 20 mm x [WIDTH] 10 to 100 mm
Steel round bar – [THICKNESS] 2 to 20 mm x [WIDTH] 200 to 610 mm

The diameter, width, thickness, and the dimensions would differ from manufacturer to manufacturer.

However, we’ve listed the average and the most common in line with the supply form above.

When it comes to the surface finish, it can be rough machined, turned, blacked, or any type of finish depending on the requirements you need for it.

What are the Applications of M35 Steel?

Now that you know M35 steel is one of the best alternatives to regular HSS, what applications can you do with it?

Power tools and accessories – some of the most customary applications of M35 steel

Here are some of the most common applications of M35 HSS:

Twist Drills
Punching Dies and Advanced Punching Dies
End Mills
Hobs
Broaches
Iron Heads and Punches
Reamers
Shape Tools

What is M35 Cobalt

M35 cobalt is the same as what M35 steel is. The only reason it’s deemed and it’s labeled as 35 “cobalt” is because of the composition of the steel or the alloy.

It contains about four (4) to about six (6) percent cobalt. As we mentioned above, it’s what’s responsible for the improvement and the overall enhancement of the steel.

This brings us to the next tip, which is…

Chemical Composition of M35 Steel

In the list below, you’ll be able to find out the element contents of M35 steel:

Vanadium (V) – 1.75 to 2.15%
Tungsten (W) – 6.16 to 6.65%
Silicon (Si) – 0.2 to 0.4%
Molybdenum (Mo) – 4.75 to 5.25%
Manganese (Mn) – 0.2 to 0.4%
Cobalt (Co) – 4.75 to 5.25%
Chromium (Cr) – 3.9 to 4.4%
Carbon (C) – 0.80 to 0.85%

NOTE: This chemical composition is based off of the American Society of Testing and Materials or the ASTM (ASTM A600). Other standards such as the JIS G4403 (SKH55), as well as the DIN EN ISO 4957 (1.3234) have varying levels of element content.

Is M42 Cobalt Better Than M35 Cobalt?

“Better” would denote that it would be advantageous to your position, correct?

Image of an M42 high speed steel

Therefore, M35 steel couldn’t be better than M42 high speed steel. Why? – It’s simply because:

They have different levels of element content
Their applications can be different
Their properties aren’t the same

However, in using them for drill bits and other cutting materials, M35 cobalt would be better because M42 high speed steel contains about 8% of cobalt, which makes it harder; making it more prone to damage and breakage due to brittleness.

Can You Trust a Chinese M35 Steel Manufacturing Company?

If you were to listen to what most people say about Chinese suppliers and manufacturers producing low quality goods, you’ll never gain profitable advantage.

Just the simple act of choosing a Chinese manufacturer already brings you to that edge. And here in China, there are multiple businesses and organizations that compete for the same type of product.

Therefore, they’ll be focused on the improvement and overall development of what they offer.

Where to Purchase High Quality M35 Steel in China?

If you’re looking for the best and the most trusted M35 steel manufacturer, there’s no place you’d rather be but with us here at Waldun Steel.

Being the best in the entire country, we’ve never been more prepared to provide the types and the classifications of steel that you need.

Whether you need M35 steel, M42 high speed steel, engineering steel, and others – we’re just an email or a call away!

Get the highest quality of M35 steel you can get in the market through us! We can give it to you in the best and most competitive rates and prices!

Give us a call or shoot us an email – we will be more than happy to help you with it! We can even get you a free quotation!