Stainless steel material is a light weight, durable and corrosion resistant transition metal with possible applications in the manufacturing of various industrial parts.However, because of its hardness, it can easily injure tools and CNC machines. More and more machine shops do not like to CNC machined them, they prefer to machine softer materials such as aluminum, copper, etc. One of the advantages of our company is that we can process these stainless steel materials very well, and the quality of surface finish, tolerance, etc. can be well guaranteed with fast delivery time.


What is CNC Machining Stainless Steel?

Normally, people will call materials with chromium content ≥ 12% or nickel content ≥ 8% as stainless steel.It has good corrosion resistance in the air or in a corrosive environment, and can be at extremely high temperatures (usually >450°C).It has very strong rigidity, and the steel with the chromium content of 16%~18% is called acid-resistant steel or acid-resistant stainless steel.Stainless Steel is the abbreviation of stainless acid-resistant steel, resistant to air, steam, water and other weak corrosive media or stainless steel is called stainless steel.

As a precision CNC machining stainless steel parts manufacture, we must understand the grade of stainless steel, the corresponding characteristics and the applications.For example, in aerospace, petrochemical, construction and transportation, living kitchenware, etc., have different requirements for the stainless steel material.

Why CNC machine shops do not want to make the stainless steel materials?

Large cutting force: The deformation of stainless steel is large during the CNC machining, which leads to an increase in cutting force. Stainless steel has serious work hardening and high thermal strength, which further increases the cutting resistance, and it is more difficult to curl and break the chips.

The chip is not easy to break, easy to bond.

The toughness for stainless steel is very large, in the CNC machining process,this will affect the surface roughness.

The tools are easily damaged due to its hardness.



What are the benefits of CNC machining stainless steel?

Since there are so many difficulties in processing CNC machining stainless steel materials, why do many customers prefer to use stainless steel materials for their projects? Below is the benefits for your considerations.

(1) Corrosion resistance
Many machining metal parts are put to use in harsh environments where corrosion presents a risk to the functionality and the safety of equipment. Stainless steel machining offers a guarantee of durability that many heavy-duty and industrial clients require.

(2) High strength and stable quality.
(3) Beautiful surface and diversified use possibilities.
(4) High-temperature oxidation resistance and high strength.
(5) Because there is no need for surface treatment, it is simple and easy to maintain.
(6) Good welding performance.
(7) Excellent thermal expansion performance and thermal insulation performance. Improved weldability.

Worthy Hardware has more than 25 years of CNC Machining stainless steel production experience, you could reply to us for your projects, our capabilities and experience workers could our customers handle complex shape parts.


CNC Machining Stainless Steel Material

During our 25 years in the CNC machining industry, Worthy Hardware handles more than 50+ metal, plastic, and wood materials, below material brands are the popular stainless steel materials we produce, if you have other materials, pls help to send them for quote.

Stainless Steel 303

Stainless steel 303 is an austenitic type of free-cutting stainless and wear-resistant acid steel containing sulfur and selenium respectively. It is used in occasions that require free cutting and high surface finish.

Chemical Composition

C % Si % Mn % P % S % Cr % Ni % Mo %
≤0.15 ≤1.00 ≤2.00 ≤0.20 ≤ 0.15 17.00-19.00 8.00-10.00 ≤0.6

Mechanical Properties

Tensile strength σb (MPa): ≥520
Conditional yield strength σ0.2 (MPa): ≥205
Elongation δ5 (%): ≥40
Reduction of area ψ (%): ≥50
Hardness: HB≤187HB; HRC≤90HRB; HV≤200HV

Comparison Table in Various Countries

Y1Cr18Ni9 303 SUS303 1.4305 -

Stainless Steel 304

Stainless steel 304 is a common material in stainless steel, with a density of 7.93 g/cm³, which is also called 18-8 stainless steel in the industry. High temperature resistance of 800℃, good processing performance, high toughness, widely used in industry and furniture decoration industry and food and medical industry

Chemical Composition

C % Si % Mn % P % S % Cr % Ni %
≤0.08 ≤0.030 ≤2.00 ≤0.045 ≤0.030 18.0–20.0 8.0-11.0

Mechanical Properties

Tensile strength σb (MPa)≥515-1035
Conditional yield strength σ0.2 (MPa)≥205
Elongation δ5 (%)≥40
Hardness: ≤201HBW; ≤92HRB; ≤210HV
Melting point (℃): 1398~1454
Specific heat capacity (0~100℃, KJ·kg-1K-1): 0.50
Linear expansion coefficient (10-6·K-1): (0~100℃) 17.2, (0~500℃) 18.4
Resistivity (20℃, 10-6Ω·m2/m): 0.73

Comparison Table in Various Countries

0Cr18Ni9 304 SUS304 1.4301 08X18H10

Stainless Steel 316

Due to the addition of Mo element, 316 stainless steel has greatly improved its corrosion resistance and high temperature strength. The high temperature resistance can reach 1200-1300 degrees, and it can be used under harsh conditions.Because of the addition of Mo, its corrosion resistance, atmospheric corrosion resistance and high temperature strength are particularly good, and can be used under harsh conditions; excellent work hardening (non-magnetic); excellent high-temperature strength; non-magnetic in solid solution; cold The rolled product has good gloss and beautiful appearance

Chemical Composition

C % Si % Mn % P % S % Cr % Ni % Mo %
≤0.08 ≤1.00 2≤2.00 ≤0.045 ≤0.030 16.00~18.00 10.00~14.00 2.00~3.00

Typical Mechanical

Tensile strength σb (MPa): ≥ 620
Conditional yield strength σ0.2 (MPa): ≥310
Elongation δ5 (%): ≥30
Reduction of area ψ (%): ≥40

Comparison Table in Various Countries

0Cr17Ni12Mo2 316 SUS316 1.4401 -

Stainless Steel 420

Stainless steel 420 is a martensitic stainless steel with certain wear resistance and corrosion resistance, and high hardness. It is suitable for all kinds of precision machinery, bearings, electrical, equipment, instruments, meters, transportation tools, household appliances, etc. It is mostly used to manufacture parts that are resistant to atmospheric, water vapor, water and oxidizing acid corrosion.

Chemical Composition

C % Si % Mn % P % S % Cr % Ni % Mo %
0.16~0.25 ≤1.00 ≤1.00 ≤0.04 ≤0.030 12.00~14.00 ≤0.75 0

Mechanical Properties

Tensile strength σb (MPa): quenched and tempered, ≥635
Conditional yield strength σ0.2 (MPa): quenched and tempered, ≥440
Elongation δ5 (%): quenching and tempering, ≥20
Reduction of area ψ (%): quenching and tempering, ≥50
Impact energy Akv (J): quenching and tempering, ≥63
Hardness: annealing, ≤223HB; quenching and tempering, ≥192HB

Comparison Table in Various Countries

3Cr13 420 SUS420J2 1.4028 30X13

Stainless Steel 430

Stainless steel 430 is a general-purpose steel with good corrosion resistance. It has better thermal conductivity than austenite, a smaller thermal expansion coefficient than austenite, heat fatigue resistance, addition of stabilizing element titanium, and good mechanical properties of the weld.
Stainless steel 430 is used for building decoration, fuel burner parts, household appliances, and home appliance parts. 430F is a steel grade with free-cutting performance added to 430 steel, mainly used for automatic lathes, bolts and nuts, etc.

Chemical Composition

C % Si % Mn % P % S % Cr % Ni % Mo %
≤0.12 ≤0.75 ≤1.00 ≤0.04 ≤0.030 16.00~18.00 ≤0.6 0

Mechanical Properties

Density: 7.75g/cm³
Melting point: 1427℃
Expansion coefficient: mm/℃(at 20-100℃)
Young's modulus: kN/mm²
Rigid modulus: kN/mm²

Comparison Table in Various Countries

1Cr17 430 SUS430 1.4016 -

Stainless Steel 440C

Stainless steel 440 is a martensitic stainless steel. The carbon content is 1.0%, and the chromium content is 16-18%. It has strong rust resistance and is a high-quality stainless steel. Scope of application: Mainly used to manufacture bearing parts that work in corrosive environments and non-lubricated strong oxidizing atmospheres. 440C has good high-temperature dimensional stability, so it can also be used as corrosion-resistant high-temperature bearing steel. In addition, it can also be used to manufacture high-quality knives, such as medical scalpels, scissors, nozzles, bearings, etc. 440C has a lower ability to withstand dynamic loads

Chemical Composition

C % Si % Mn % P % S % Cr % Ni % Mo %
0.95~1.20 ≤1.00 ≤1.00 ≤0.035 ≤0.030 16.00~18.00 ≤0.6 0

Mechanical Properties

Hardness: Annealed, ≤269HB;
Quenching and tempering, ≥58HRC
Internal stress (250 N/mm2)
Tensile strength (560 N/mm2)

Comparison Table in Various Countries

Y11Cr17 440F SUS440F -

Stainless Steel 17-4PH

Stainless Steel 17-4PH is a precipitation, hardening, martensitic stainless steel composed of copper, niobium/columb.

Chemical Composition

C % Si % Mn % P % S % Cr % Ni % Cu %
≤0.07 ≤1.00 ≤1.00 ≤0.04 ≤0.030 15.5~17.5 3.0~5.0 3.0~5.0

Mechanical Properties

Tensile strength σb (MPa): aging at 480℃
Conditional yield strength σ0.2 (MPa): aging at 480°C
Elongation δ5 (%): aging at 480°C
Reduction of area ψ (%): aging at 480°C

Comparison Table in Various Countries

0Cr17Ni4Cu4Nb 630 SUS630 1.4542 -

Nitronic 60

Nitronic 60 is a high-strength stainless steel. Compared with cobalt-containing and high-nickel alloys, Nitronic 60 stainless steel can achieve corrosion resistance and wear resistance at a very low cost. Its overall corrosion resistance is better than most stainless steel 304

Chemical Composition

C % Si % Mn % P % S % Cr % Ni % Cu %
≤0.01 ≤1.00 ≤1.00 ≤0.04 0.035-0.045 16-18 8-9 3.0~5.0


Worthy Hardware Advantages

When you source the CNC Machining shops from the world, there are huge numbers of CNC machining service providers. Why you should choose Worthy Hardware as your trust vendor?

CNC machining

Advantage 1: Comprehensive Capabilities

As the leading manufacturer of CNC machining for over 25 years, we are well equipped with 35 sets CNC Machines, including 3 sets 5 axis ,4 sets 3 axis, 12 sets turning and milling compound. These machines could allow us to make prototypes, small batch and mass production parts. The fastest delivery time is 3 working days.

CNC machining

Advantage 2: Rich Experience

Our engineers and production workers have at least 15 years of CNC Machining experience, So we are responsible for various complex types of precision parts. We are very strong in making the tough materials, such as tool steel, alloy steels, SS316.

CNC machining

Advantage 3: Strict Quality

As the ISO 9001:2015, certified quality management system, all the team, material and machines are in regular status of quality assurance, we make it correct at the first time not only to ourselves, but also to our customers. We check and maintenance the machines everyday except the holiday time. In the production stage including the samples, the production workers check the dimensions frequently, and then the production manager will check the dimension again, finally our QC department will make the final checking with CMM. We make the 100% inspection for the parts, especially for the thread and surface.

CNC machining

Advantage 4: Stable Employees

80% of the workers in Worthy Hardware have worked here for more than 12 years, and most are home fellows. They're settled down in Donguan already. Therefore, we can be assured that quality and delivery time will not fall apart anytime soon because we've already been through all these hardships together as one family!


Customer Testimonials

In the past 25 years, our clients are all over the world, including the world's top 500 companies such as Jabil, ABB, Medtronic and so on. Do you want to know what our customers say about us? Let's take a look.

Justin, CEO of a lighting company

I inspected the top two pieces of all five boxes. Everything is beautiful! BEAUTIFUL! You remove so much stress from my shoulders. I know that when we pay you to manufacture a product, it will be made perfectly. The glass bead blasting and anodizing is always beautiful. I am so very happy! You make it easier for us to run our business. There is no trouble! With most factories, I have a moment of fear before I open their boxes. Will the components be made correctly? Do they care about quality? It is often a war. And Dennis has to fight the war, treating most factories like small children! But, not your company. You’re company is world-class. You make beautiful components!Thank you very much for your hard work. We will work together for many lifetimes!

David, General manager for a family owned business

I’ve been working with Chinese manufacturers since 2004 and had some really unfortunate partnerships until 2012 when we partnered with Worthy Hardware. At first,we only gave them small orders to test and make the start. However,their response speed was very fast ,and their engineers help us improved our designs more simple, this helped us reduce a lot of cost.Our cooperate is more and more stable! We trust Worthy Hardware always ,very responsible. Your guys are great! .Worthy Hardware is by far my favorite, because of the way they handle business and the quality of what they make.If you are from USA and would like to know more about Worthy Hardware,i would be very happy to be as an endorsement.


CNC Machining Stainless Steel FAQ

1.What is the most common type of stainless steel used for CNC machining?

There is three types popular used stainless steel material for CNC machining, SS303,SS304,SS316.
SS303 is more easier to cnc machined.
SS304 is widely use for CNC forging procss.
SS316 is the hardest for CNC machining.

2.Are CNC machined stainless steel parts harmful to humans?

Although stainless steel contains chromium, nickel and other alloy elements, there is no harm to the human body.

3.Why does stainless steel CNC machining parts rust ?

Depends on the use conditions and environment,stainless steel corrosion resistance is subject to change.So it will be rusted.For example,in a dry and clean environment,the anti-rust and corrosion resistance for stainless steel 304 are excellent, but used in the seaside environment, it is easy to make it rust.

4.Why stainless steel 304 is also magnetic?

Stainless steel 304 is a kind of austenitic stainless steel. Some or a small amount of austenite is transformed into martensite during the cold process. However, martensite stainless steel is magnetic, so 304 stainless steel is non-magnetic or slightly magnetic.


CNC Machining Stainless Steel Projects

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