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Stainless Steel in CNC Machining

Stainless steel is a family of steel alloys containing chromium, which provides a protective oxide layer and gives the material its excellent resistance to corrosion and oxidation. It is widely used in CNC machining for components that require strength, durability, hygiene, and resistance to moisture or chemicals.

Different stainless steel grades provide different combinations of corrosion resistance, strength, hardness, machinability, and temperature performance. Austenitic grades such as 304 and 316 are widely used for general-purpose and corrosion-resistant applications, while 17-4 PH provides higher strength and hardness after heat treatment.

Stainless steel can be CNC machined into complex and precise components for industries including medical, food processing, aerospace, automotive, marine, chemical processing, and industrial equipment.

Available Stainless Steel at Elite Mold Tech:

価格

$$$

リードタイム：

< 10日以内

壁の厚さ：

0.75 mm

公差：

±0.125mm (±0.005″)

最大部品サイズ：

200 x 80 x 100 cm

対象学年：

Stainless Steel 304, 316, 17-4 PH

ステンレス鋼304

Stainless Steel 304 is one of the most widely used stainless steel grades for CNC machining. It provides excellent corrosion resistance, good strength, and good formability, making it suitable for general industrial, food processing, medical, and consumer applications.

引張強度、降伏点（MPa） 215

疲労強度（MPa） 240

破断伸び（%） 40

硬度（ブリネル） 123

密度（g/cm³） 8.00

Stainless Steel 316

Stainless Steel 316 provides improved corrosion resistance compared with 304, particularly in chloride-rich and marine environments. Its molybdenum content improves resistance to pitting and crevice corrosion, making it suitable for chemical, marine, medical, and food-processing applications.

引張強度、降伏点（MPa） 205

疲労強度（MPa） 240

破断伸び（%） 40

硬度（ブリネル） 149

密度（g/cm³） 8.00

ステンレス鋼 17-4 PH

17-4 PH is a precipitation-hardening stainless steel that provides high strength, hardness, and good corrosion resistance. It can be heat treated to achieve different mechanical properties and is commonly used for demanding aerospace, industrial, and mechanical components.

引張強度、降伏点（MPa） 1000

疲労強度（MPa） 510

破断伸び（%） 10

硬度（ブリネル） 293

密度（g/cm³） 7.75

Surface Finishing Options for Stainless Steel

CNC machined stainless steel parts can undergo various surface finishing processes to improve appearance, corrosion resistance, wear resistance, hygiene, and overall surface quality.

機械加工
ビーズブラスト
サンドブラスト
タンブリング
研磨
電解研磨
不動態化
ブラッシュ仕上げ
無電解ニッケルめっき
PVDコーティング
パウダーコーティング

Pros and Cons of Stainless Steel CNC Machining

Stainless steel provides an excellent combination of corrosion resistance, strength, durability, and appearance, making it suitable for demanding CNC applications. However, its hardness and work-hardening behavior can make machining more challenging than softer materials.

Excellent Corrosion Resistance: Stainless steel can withstand moisture, chemicals, and many corrosive environments without rapidly degrading.
High Strength: Many stainless steel grades provide strong mechanical performance for demanding components.
Excellent Durability: Stainless steel offers good resistance to wear, impact, and mechanical stress.
Hygienic Surface: Its smooth and corrosion-resistant surface makes it suitable for food processing, medical, and pharmaceutical applications.
High Temperature Performance: Several stainless steel grades can maintain useful mechanical properties at elevated temperatures.

More Difficult to Machine: Stainless steel can generate higher cutting forces and may work harden during machining.
Higher Tool Wear: Improper cutting conditions can accelerate tool wear, particularly with harder stainless steel grades.
Higher Material Cost: Stainless steel generally costs more than mild steel and some aluminum alloys.
Heat Management: Stainless steel can retain heat near the cutting zone, requiring suitable cutting parameters and coolant strategies.